GB2496719B

GB2496719B - Club head sets with varying characteristics and related methods

Info

Publication number: GB2496719B
Application number: GB1217304.3A
Authority: GB
Inventors: R Jertson Marty; Chen Xiaojian
Original assignee: Karsten Manufacturing Corp
Current assignee: Karsten Manufacturing Corp
Priority date: 2011-11-18
Filing date: 2012-09-27
Publication date: 2019-09-25
Anticipated expiration: 2032-09-27
Also published as: GB2496719A; GB201217304D0

Description

CLUB HEAD SETS WITH VARYING CHARACTERISTICS

AND RELATED METHODS

TECHNICAL FIELD

[01] This disclosure relates generally to sports equipment, and relates more particularly to club heads and related methods.

BACKGROUND

[02] Golf clubs and specifically golf club heads of various designs have typically been developed to improve a person’s golf swing and resulting golf shot. In particular, many people are unable to hit or lack consistency when hitting “down” on a ball, that is, to regularly hit the ball squarely. Golf club designs and, particularly, golf club head designs may optimize a golf club head’s weighting scheme, such as the golf club head’s center of gravity position and moments of inertia. Such designs may mitigate a person’s inconsistency problems. Back weighting and/or an additional lower toe weighting may strategically position the center of gravity and may induce the person during his swing to hit “down” on the ball, thus, hitting the ball squarely.

[03] In a first aspect, the present invention provides a golf club head set according to Claim 1.

[03a] In a second aspect, the present invention provides a golf club head set according to claim 4.

BRIEF DESCRIPTION OF THE DRAWINGS

[04] FIG. 1 illustrates an exploded view of a golf club head; [05] FIG. 2 illustrates a front view of the golf club head of FIG. 1; [06] FIG. 3 illustrates an exploded, cross-sectional view of the golf club head, taken from a section line 3-3 in FIG. 1; [07] FIG. 4 illustrates an exploded, cross-sectional view of the golf club head, taken from a section line 4-4 in FIG. 1; [08] FIG. 5 illustrates a perspective view of the golf club head of FIG. 1; [09] FIG. 6 depicts a flow diagram representation of one manner in which a golf club head may be manufactured; [10] FIG. 7 depicts a flow diagram representation of one manner in which a golf club may be manufactured; [11] FIG. 8 presents a rear view of a club head of a club head set with varying characteristics; [12] FIG. 9 presents a toe side view of the club head of FIG. 8; [13] FIG. 10 illustrates a rear view of a body of the club head of FIG. 8, where the club head is in a disassembled state; [14] FIG. 11 illustrates a rear view of a body of another club head of the club head set of the club head of FIG. 8, where the club head is in a disassembled state; [15] FIG. 12 illustrates a rear view of a body of yet another club head of the club head set of the club head of FIG. 8, where the club head is in a disassembled state; [16] FIG. 13 illustrates a cross-sectional view of the club head of FIGs. 8 and 10 along a line 13-13 of FIG. 10; [17] FIG. 14 illustrates a cross-sectional view of the club head of FIG. 11 along a line 14- 14 of FIG. 11; [18] FIG. 15 illustrates a cross-sectional view of the club head of FIG. 12 along a line 15- 15 of FIG. 12; [19] FIG. 16 illustrates a chart of an exemplary relationship between support bar width relative to loft angle for the club head set of FIGs. 8-15; [20] FIG. 17 illustrates several club heads of a club head set with varying characteristics; [21] FIG. 18 illustrates a cross-sectional view of the club head of FIG. 8 along line 18-18 from FIG. 8; [22] FIG. 19 illustrates a chart of exemplary relationship between loft angle and distances between lower toe inserts to front faces for the exemplary club heads of FIGs. 8-18; [23] FIG. 20 illustrates a flowchart of a method for providing a club head set similar to the club head sets described for FIGs. 8-19; [24] FIG. 21 illustrates a flowchart of another method for providing a club head set similar to the club head sets described for FIGs. 8-19; [25] FIG. 22 illustrates a chart with sample ranges for relationships between the support bar widths and the loft angles I club head numbers; [26] FIG. 23 illustrates a chart with sample ranges for relationships between the distances from the lower toe inserts to the club head front faces and the loft angles I club head numbers; and [27] FIG. 24 illustrates a flowchart of a method for providing a club head similar to the club head shown in FIGs. 8-10, 13, and 18.

[28] FIG. 25 illustrates a rear view of a club head of a club head set with varying characteristics; [29] FIG. 26 illustrates a rear view of another club head of the club head set of FIG. 25.

[30] FIG. 27 illustrates a rear view of yet another club head of the club head set of FIG. 25.

[31] FIG. 28 illustrates a top “x-ray” view of the club head of FIG. 25 poised to strike a golf ball.

[32] FIG. 29 illustrates a rear view of a club head similar to that of FIG. 25 and with a varying stabilizing bar.

[33] FIG. 30 illustrates a rear view of a club head similar to that of FIG. 25 and with a plurality of stabilizing bars.

[34] FIG. 31 illustrates a flowchart of a method for providing a club head set in accordance with FIGs. 25-30.

[35] FIG. 32 illustrates a rear view of a club head of a club head set according to an embodiment of the invention.

[36] FIG. 33 illustrates a rear view of another club head of the club head set of FIG. 32.

[37] FIG. 34 illustrates a rear view of yet another club head of the club head set of FIG. 32.

[38] FIG. 35 illustrates a rear view of still another club head of the club head set of FIG. 32.

[39] FIG. 36 illustrates an exemplary club head of a club head set comprising six stabilization bars according to another embodiment; [40] FIG. 37 illustrates a flowchart of a method for providing a golf club head set in accordance with FIGs. 32-36.

[41] For simplicity and clarity of illustration, the drawing figures illustrate the general manner of construction, and descriptions and details of well-known features and techniques may be omitted to avoid unnecessarily obscuring the golf clubs and their methods of manufacture. Additionally, elements in the drawing figures are not necessarily drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help improve understanding of embodiments of the golf clubs and their methods of manufacture. The same reference numerals in different figures denote the same elements.

[42] The terms “first,” “second,” “third,” “fourth,” and the like in the description and in the claims, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of golf clubs and methods of manufacture described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms “contain,” “include,” and “have,” and any variations thereof, are intended to cover a nonexclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[43] The terms “left,” “right,” “front,” “back,” “top,” “bottom,” “side,” “under,” “over,” and the like in the description and in the claims, if any, are used for descriptive purposes and not necessarily for describing permanent relative positions. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of golf clubs and methods of manufacture described herein are, for example, capable of operation in other orientations than those illustrated or otherwise described herein. The term “coupled,” as used herein, is defined as directly or indirectly connected in an electrical, physical, mechanical, or other manner.

DESCRIPTION

[44] Disclosed herein is a golf club head comprising a body having a toe region, a heel region opposite the toe region, a sole region, and a top region opposite the sole region. The golf club head further comprises a front face, a first back opposite the front face, a second back opposite the front face and extending farther from the front face than the first back. The second back extends from the heel region to the toe region, and extends from the sole region to about a midpoint between the sole region and the top region. The golf cub head further comprises a first cavity between the first back and the second back, and a second cavity integral with the second back at the toe region. This proposal may further comprise a first weight that is inserted in the first cavity and a second weight inserted in the second cavity.

[45] In another proposal, a golf club head comprises a body comprising a front face, a heel region, a toe region opposite the heel region, and a sole. The sole extends from the heel region to the toe region, and the sole extends from the front face to a back sole edge. The golf club head further comprises a top opposite the sole, and a first back opposite the front face and substantially parallel to the front face. The first back extends from the heel region to the toe region, and extends from a midpoint between the sole and the top, to the top. The golf club head further comprises a second back opposite the front face extending from the back sole edge to about the midpoint. The golf club head further comprises a rectangular first cavity between the second back and the front face, and a second cavity integral with the second back at the toe region. This proposal may further comprise a first weight that is inserted in the first cavity and a second weight inserted in the second cavity.

[46] In another proposal, a golf club comprises a golf club head described herein and coupled to a shaft. The golf club further comprises a hosel ratio of 0.75 wherein, the hosel ratio comprises a hosel distance to a front face distance. The hosel distance extends from a point at the heel region to a second end opposite the first end, and the front face distance comprises a distance measured along the front face from the point to a toe edge and substantially parallel to the sole. The golf club may further comprise a first weight to occupy the first cavity and a second weight to occupy the second cavity.

[47] A method for manufacturing a golf club head comprises providing a body having a toe region, a heel region opposite the toe region, a sole region, and a top region opposite the sole region. This proposal further comprises a front face, a first back opposite the front face, a second back opposite the front face and extending farther from the front face than the first back. The second back extends from the heel region to the toe region, and extends from the sole region to about a midpoint between the sole region and the top region. The body is further provided to comprise a first cavity between the first back and the second back, and a second cavity integral with the second back at the toe region. This proposal may further comprise providing a first weight that is inserted in the first cavity and providing a second weight inserted in the second cavity.

[48] A club head set can comprise two or more club heads, each comprising a loft angle, a front face, a back face opposite the front face, and one or more support bars protruded from the back face. The loft angle can be incrementally varied across the two or more club heads, and a characteristic of the one or more support bars is incrementally varied across the two or more club heads as the loft angle is incrementally varied across the two or more club heads.

[49] A club head set can comprise first and second club heads, the first club head can comprise a first loft angle, a first front face, and a first back portion comprising a first heel region, a first toe region, a first back face opposite the first front face and extended between the first heel and toe regions, and one or more first support bars coupled to the first back face. The second club head can comprise a second loft angle, a second front face, and a second back portion comprising a second heel region, a second toe region, a second back face opposite the second front face and extended between the second head and toe regions, and one or more second support bars coupled to the second back face. In such proposals, the first loft angle is greater than the second loft angle, and an attribute of the one or more first support bars is greater than an attribute of the one or more second support bars.

[50] Providing a club head set can comprise providing a first club head, the first club head comprising a first loft angle, a first front face, and a first back portion comprising, a first heel region, a first toe region, a first back face opposite the first front face and extended between the first heel and toe regions, and one or more first support bars coupled to the first back face, the one or more first support bars comprising a first support bar characteristic. Providing the club head set can also comprise providing a second club head, the second club head comprising a second loft angle, a second front face and a second back portion comprising a second heel region, a second toe region, a second back face opposite the second front face and extended between the second heel and toe regions, and one or more second support bars coupled to the second back face, the one or more second support bars comprising a second support bar characteristic. In such proposals, providing the first club head comprises providing the first loft angle to be greater than the second loft angle, and providing the first support bar characteristic to be greater than the second support bar characteristic.

[51] A club head set can comprise two or more club heads, each comprising a loft angle, a front face, and a backside comprising a back face opposite the front face, and a weight located only at a lower toe section of the backside. In such proposals, the loft angle can be varied across the two or more club heads, a first characteristic of the weight can be varied across the two or more club heads, a second characteristic of the weight can be varied across the two or more club heads, and the first and second characteristics can be inversely varied relative to each other.

[52] A club head set can comprise first and second club heads, the first club head can comprise a first loft angle, a first front face, and a first back portion that comprises a first heel region, a first toe region comprising a first lower toe section, and a first back face opposite the first front face and extended between the first heel and first toe regions. The second club head can comprise a second loft angle, a second front face, and a second back portion that comprises a second heel region, a second toe region comprising a second lower toe section, and a second back face opposite the second front face and extended between the second heel and second toe regions. The first club head can also comprise a first weight at the first lower toe section of the first toe region, and the second club head can also comprise a second weight at the second lower toe section of the second toe region. In such proposals, the first loft angle can be greater than the second loft angle, the first and second weights can comprise substantially similar masses, the first and second weights each comprise first dimensions corresponding to each other, and the first and second weights each comprise second dimensions corresponding to each other. When the first dimension of the first weight is greater than the first dimension of the second weight, the second dimension of the second weight can be greater than the second dimension of the first weight. When the second dimension of the first weight is greater than the second dimension of the second weight, the first dimension of the second weight can be greater than the first dimension of the first weight.

[53] Providing a club head set can comprise providing a first club head of the club head set, and providing a second club head of the club head set. The first club head can comprise a first loft angle, a first front face, and a first back portion comprising a first back face opposite the first front face and extended between heel and toe regions of the first back portion and a first lower toe section comprising a first cavity. The second club head can comprise a second loft angle, a second front face, and a second back portion comprising a second back face opposite the second front face and extended between heel and toe regions of the second back portion, and a second lower toe section comprising a second cavity. Providing the first club head can comprise providing a first weight at the first cavity, and providing the first loft angle to be greater than the second loft angle. Providing the second club head can comprise providing a second weight at the second cavity. Providing the first weight can comprise providing a first length, a first width, and a first depth of the first weight.

Providing the second weight can comprises providing a second length and a second width of the second weight such that at least one of the second length of the second weight is greater than the first length of the first weight, or the second width of the second weight is greater than the first width of the first weight. Providing the second weight can also comprise providing a second depth of the second weight such that the first depth of the first weight is greater than the second depth of the second weight.

[54] A golf club head can comprise a front face and a back portion. The back portion can comprise a heel region, a toe region, a center region between the heel and toe regions, a back end extended between the heel and toe regions, and a cavity. The cavity can comprise a cavity heel zone, a cavity toe zone, a cavity center zone between the cavity heel and toe zones, a cavity inner section located towards the front face, and a cavity outer section located towards the back end. The cavity can be wider at the cavity center zone than at the cavity heel and toe zones.

[55] A method can comprise providing an insert for a golf club head and/or providing a body of a club head. Providing the insert can comprise providing insert heel and toe zones, and providing an insert center zone between the insert heel and toe zones that is thicker than the insert heel and toe zones. Providing the body can comprise providing a back face and a back end at a back portion of the body, and providing a cavity between the back face and the back end. The cavity can comprise a cavity inner section adjacent to the back face, a cavity outer section opposite the back end, cavity heel and toe zones, and a cavity center zone between the cavity heel and toe zones that is thicker than the cavity heel and toe zones. The insert can be provided to be at least partially housed in the cavity.

[56] A golf club head can comprise a back portion of a body of the club head, and an insert. The back portion can comprise a heel region, a toe region, a center region between the heel and toe regions, a back surface opposite the front face and extended between the heel and toe regions, a back wall extended between the heel and toe regions, and a cavity located between the back surface and the back wall. The cavity can comprise a cavity heel zone, a cavity toe zone, a cavity center zone between the cavity heel and toe zones, a cavity inner wall comprising a portion of the back surface, and a cavity outer wall located opposite the back wall. The insert can comprise an insert heel zone, an insert toe zone, an insert center zone between the insert heel and toe zones, an insert inner wall complementary to the cavity inner wall, and an insert outer wall complementary to the cavity outer wall. The golf club head can comprise a moment of inertia about the center region. The insert can be configured to be at least partially housed in the cavity. The cavity can be wider, from the cavity inner wall to the cavity outer wall, at the cavity center zone than at the cavity heel and toe zones. The insert can be wider, from the insert inner wall to the insert outer wall, at the insert center zone than at the insert heel and toe zones. A distribution of mass of the cavity inner wall can be concentrated at the cavity center zone. A distribution of mass of the insert can be shifted away from the insert heel and toe zones and towards the insert center zone. A density of a body of the golf club head can be greater than a density of the insert. A first portion of the moment of inertia contributed by the body of the club head at the cavity heel and toe zones can be greater than a second portion of the moment of inertia contributed by the insert at the insert heel and toe zones. The insert heel and toe zones can be obtusely angled relative to each other about the insert center zone and along the insert inner wall. The cavity inner wall can be obtusely angled complementarily to the insert inner wall. The insert can comprise a grip portion to aid during removal of the insert from the cavity, where the grip portion can be configured to remain external to the cavity when the insert is housed in the cavity.

[57] A golf club head set can comprise a first club head comprising a first strike face, a first back face opposite the first strike face, a first top end, a first bottom end opposite the first top end, a first toe end, a first toe region comprising the first toe end, a first heel end opposite the first toe end, a first heel region comprising the first heel end, and a first vertical axis extended substantially perpendicularly through the first top end and the first bottom ends, and extended between the first heel and first toe regions. The first back face can comprise a first cavity located at the toe region and comprising a first cavity base and a first cavity wall bounding at least a portion of the first cavity base. The first back face can also comprise a first bar comprising a first bar axis extending along a length of the first bar. The first bar can be protruded from the first cavity base and extend diagonally, relative to the first vertical axis, across at least a first portion of the first cavity. The first bar axis can intersect the first vertical axis and extend therefrom towards the first toe end and the first top end.

[58] A golf club head set can comprise a first club head comprising a first strike face, a first back face opposite the first strike face, a first top end, a first bottom end opposite the first top end, a first toe end, a first toe region comprising the first toe end, a first heel end opposite the first toe end, a first heel region comprising the first heel end, and a first vertical axis extended substantially perpendicularly through the first top end and the first bottom end and extended between the first heel region and the first toe region. The first back face can comprise a first cavity located at the toe region and comprising a first cavity base and a first cavity wall bounding the first cavity base. The first back face can also comprise a first bar protruded from the first cavity base, angled at a first bar angle relative to the first vertical axis, and extending across the first cavity. The first back face can also comprise a first hourglass support protruded from the first back face and comprising top and bottom portions a middle portion narrower than the top and bottom portions, and heel and toe sidewalls defining the top, middle, and bottom portions of the first hourglass support therebetween. The toe sidewall of the first hourglass support can protrude above the first cavity base. The first cavity wall can comprise the toe sidewall of the first hourglass support.

[59] A method for providing a golf club head set can comprise providing a first club head of one or more club heads comprising diagonal stabilizing bars. A first vertical axis can extend through a first top end and a first bottom end of the first club head, and between a first heel region and a first toe region of the first club head. Providing the first club head can comprise providing a first back face opposite a first strike face of the first club head, providing a first cavity at the first back face and the first toe region, and providing a first bar within and protruded from the first cavity. The first bar can comprise a first bar axis extending along a length of the first bar. The diagonal stabilizing bars of the one or more club heads can comprise the first bar. Providing the first cavity can comprise providing a first cavity base, and providing a first cavity wall bounding the first cavity base. Providing the first bar can comprise aligning the first bar diagonally at a first bar angle relative to the first vertical axis such that the first bar axis intersects the first vertical axis and extends therefrom towards a first toe end and the first top end of the first club head.

[60] A club head set can comprise two or more club heads, each comprising a loft angle, a front face, a back face opposite the front face, and two or more stabilization bars protruded from the back face. The loft angle can vary incrementally across the two or more club heads. Meanwhile, a characteristic of the two or more stabilization bars can vary incrementally across the two or more club heads as the loft angle varies incrementally across the two or more club heads.

[61] A club head set can comprise a first club head and a second club head. The first club head can comprise a first loft angle, a first front face, a first toe, a first heel, a first top end, a first bottom end, a first back portion, and a first vertical axis. The first back portion can comprise a first back face opposite the first front face. Meanwhile, the first back face can comprise a first toe region, a first heel region, and two or more first stabilization bars. The first toe can be located closer to the first toe region than to the first heel region and the first heel can be located closer to the first heel region than to the first toe region. The first vertical axis can extend substantially perpendicularly through the first top end and the first bottom end such that the first vertical axis partially defines the first toe region and the first heel region. Likewise, the second club head can comprise a second loft angle, a second front face, a second toe, a second heel, a second top end, a second bottom end, a second back portion, and a second vertical axis. The second back portion can comprise a second back face opposite the second front face.

Meanwhile, the second back face can comprise a second toe region, a second heel region, and two or more second stabilization bars. The second toe can be located closer to the second toe region than to the second heel region and the second heel can be located closer to the second heel region than to the second toe region. The second vertical axis can extend substantially perpendicularly through the second top end and the second bottom end such that the second vertical axis partially defines the second toe region and the second heel region. The first loft angle can be greater than the second loft angle. Furthermore, an attribute of the two or more first stabilization bars can be greater than an attribute of the two or more second stabilization bars.

[62] A method for providing a club head set can comprise providing a first club head and providing a second club head. The first club head can comprise a first loft angle, a first front face, a first toe, a first heel, a first top end, a first bottom end, a first back portion, and a first vertical axis. The first back portion can comprise a first back face opposite the first front face. Meanwhile, the first back face can comprise a first toe region, a first heel region, and two or more first stabilization bars. The first toe can be located closer to the first toe region than to the first heel region and the first heel can be located closer to the first heel region than to the first toe region. Furthermore, the two or more first stabilization bars can comprise a first stabilization bar characteristic, and the first vertical axis can extend substantially perpendicularly through the first top end and the first bottom end such that the first vertical axis partially defines the first toe region and the first heel region. The second club head can comprise a second loft angle, a second front face, a second toe, a second heel, a second top end, a second bottom end, a second back portion, and a second vertical axis. The second back portion can comprise a second back face opposite the second front face. Meanwhile, the second back face can comprise a second toe region, a second heel region, and two or more second stabilization bars. The second toe can be located closer to the second toe region than to the second heel region and the second heel can be located closer to the second heel region than to the second toe region. Furthermore, the two or more second stabilization bars can comprise a second stabilization bar characteristic, and the second vertical axis can extend substantially perpendicularly through the second top end and the second bottom end such that the second vertical axis partially defines the second toe region and the second heel region. Providing the first club head can comprise providing the first loft angle to be greater than the second loft angle and providing the first stabilization bar characteristic to be greater than the second stabilization bar characteristic.

[63] Other examples and embodiments are further disclosed herein. Such examples and embodiments may be found in the figures, in the claims, and/or in the description of the present application.

[64] Turning now to the figures, FIG. 1 illustrates a rear, exploded perspective view of an exemplary golf club head 100, and FIG. 2 illustrates a front view of the golf club head 100. The golf club head 100 comprises a body 101 having a toe region 110, a heel region 120 opposite the toe region 110, a hosel 105 at the heel region 120, a sole region 130, and a top region 140 opposite the sole region 130. The sole region 130 may extend from the heel region 120 to the toe region 110, and the sole region 130 may extend from a front face 250 (FIG. 2) to a back sole edge 165. The golf club head 100 may have a bore (not shown), instead of the hosel 105, at the heel region 120.

[65] The golf club head 100 further comprises a first back 160 (FIG. 1) opposite the front face 250 (FIG. 2), a second back 170 (FIG. 1) opposite the front face 250 (FIG. 2) and extending farther from the front face 250 (FIG. 2) than the first back 160 (FIG. 1), as explained in more detail hereinafter. The first back 160 may be substantially parallel to the front face 250 (FIG. 2) and the first back 160 may extend from the heel region 120 to the toe region 110. The first back 160 may also extend from the sole 130 to a midpoint 115 (FIG. 1) between the sole region 130 and the top region 140, and may further extend from the midpoint 115 to the top region 140. The second back 170 (FIG. 1) may extend from the heel region 120 to the toe region 110, and may extend from the sole region 130 to about the midpoint 115 (FIG. 1) between the sole region 130 and the top region 140, as can be seen in FIGs. 1 and 5. In a different configuration, back face 170 (FIG. 1) may extend from the sole region 130 beyond the midpoint 115, or the back face 170 may extend from the sole region 130 below the midpoint 115.

[66] As illustrated in FIGs. 1 and 3, the golf club head 100 further comprises a first cavity 180 between the first back 160 and the second back 170. As illustrated in FIG. 3, the first cavity 180 separates the first back 160 from the second back 170, and vice versa. The first cavity 180 has a rectangular shape, but other configurations are contemplated. For example, the first cavity 180 may comprise an irregular shape, or a different regular shape, for example, triangular, circular, octagonal, hexagonal, and the like. In another example, the first cavity 180 may comprise a symmetrical shape or an asymmetrical shape. Moreover, the first cavity 180 may comprise various dimensions.

[67] As illustrated in FIGs. 1 and 4, the golf club head 100 also comprises a second cavity 190 integral with the second back 170 at the lower toe region 110. Similar to the first cavity 180, the second cavity 190 may also comprise various shape and dimensional configurations. The shape and dimensional of the first cavity 180 and the second cavity 190 may be determined by the variables that optimize the utility of the golf club head 100, and to adjust the moments of inertia, the center of gravity, and the like. Also, the golf clubs and methods of manufacture described herein, may further comprise cavities that vary in volume, and the volume may depend upon the desired design of the golf club head. Although the above examples may describe two cavities (e.g., the first and second cavities 180 and 190), the golf clubs and methods of manufacture described herein may include additional cavities.

[68] This golf club head 100 further comprises a first weight 185 that is inserted in the first cavity 180 and a second weight 195 that is inserted in the second cavity 190. The first weight 185 and second weight 195 may comprise various shapes and dimensional configurations. For example, the first weight 185 and the second weight 195 may comprise shapes and dimensions that are complimentary to the respective cavities into which they are inserted (e.g., the first and second cavities 180 and 190, respectively). In another example, the first weight 185 and the second weight 195 may comprise shapes that only partially occupy the cavities into which they are inserted, or the first weight 185 and the second weight 195 may comprise shapes that overfill the first and second cavities 180 and 190, respectively. The first weight 185 and the second weight 195 can comprise various materials. In one proposal, the first weight 185 comprises a metal matrix material. In another proposal, the first weight 185 comprises a polymer, and may be either a thermoset or thermoplastic polymer. First weight 185 may comprise a specific gravity of approximately 1 g/cm3 (grams per cubed centimeter) to approximately 9 g/cm3 in some examples. The second weight 195 may comprise a metal, and may be either a single elemental metal such as iron, or a metal alloy, such as tungsten or titanium alloy. In this example, the first weight 185 comprises a metal matrix material because it generally provides the ability to adjust the back weighting more so than the lightest, or least dense metal or metal alloy, and the second weight 195 comprises a metal because an outer toe weight may be beneficial to induce a golfer to swing “downwardly” and “outwardly.” In another proposal, the first weight 185 and the second weight 195 may comprise of the same material, such as a polymer, a composite, a metal, or a metal alloy. The body 101 can comprise standard golf club head materials such as iron, iron alloys, titanium alloys, and the like, and the first weight 185 and the second weight 195 can comprise the same or different materials as the body 101. As with the shape determination for the first and second cavities, the material determination may be similarly dependent upon the variables that maximize the utility of the golf club head, and other material configurations other than those specifically described are contemplated.

[θθ] In another proposal, and with reference to FIG. 2 a golf club 200 comprises the golf club head 100 coupled to a shaft 208. In this proposal, the golf club 200 may further comprise a hosel ratio of 0.75. The hosel ratio comprises a hosel distance 203 to a front face distance 253. The hosel distance 203 measures from a first end 206 at about the heel region 120 to a second end 207 opposite the first end 206. The first end 206 is located at a point 204 where a linear portion of the hosel 105 begins to curve into the front face 250. The front face distance 253 comprises the distance measured along the front face 250 from the point 204 to a toe edge 211 and substantially parallel to the sole 130. The golf club 200 may further comprise, for example as shown in FIG. 1, the first weight 185 to occupy the first cavity 180 and the second weight 195 to occupy the second cavity 190.

[70] The golf club 200, as described herein with the cavities and inserted weights of the golf club head 100, provides for an exemplary golf club that assists a golfer to improve his or her golf swing by allowing for customization of the back weight and toe weight in the club head 100.

Furthermore, among the various embodiments described herein, the golf clubs and their methods of manufacture may be for irons, drivers, fairway woods, hybrids, putter, and or other suitable types of clubs.

[71] A method 600 for manufacturing a golf club head comprises providing a golf club head (a block 610). The golf club head of the block 610 may be similar to the golf club head 100 shown in FIGs. 1-5. Method 600 further comprises determining a first weight (a block 620), securing the first weight in a first cavity (a block 630), determining a second weight (a block 640), and securing the second weight in a second cavity (a block 650). As an example, the first weight of the block 620 may be similar to the first weight 185 of FIG. 1, and the second weight of the block 640 may be similar to the second weight 195 of FIG. 1.

[72] Furthermore, the determining step in the block 620 may include having a professional golf technician analyze a golfer’s swing. Depending on the swing analyzed by the professional golf technician, a lighter or heavier weight may be determined. Similarly, the determining step in the block 640 may likewise include determining whether to use a lighter or heavier weight based upon analysis of a golfers swing by a professional golf technician. In addition or alternatively, software, firmware, and/or hardware may be used to determine the first weight (e.g., monitor, measure, and/or analyze various parameters associated with an individual’s golf swing).

[73] A method 700 for manufacturing a golf club may comprise providing a golf club head (the block 610), determining a first weight (the block 620), securing the first weight in a first cavity (the block 630), determining a second weight (the block 640), securing the second weight in a second cavity (the block 650), and coupling the body to a golf club shaft (a block 760). As an example, the shaft of the block 760 may be similar to the shaft 208 of FIG. 2. Also, the coupling step of the block 760 can include taping, adhering, welding, swaging, or other suitable techniques.

[74] The method for securing the first and/or second weight(s) comprises any process to secure the weights in their respective cavities. For example, if either of the weights comprises a polymer material, then the weights may be glued and/ or secured by an adhesive. If, for example, either of the weights is made of metal, then the weights may be similarly glued or secured by an adhesive, and additionally may be secured by any other known method for securing a metal within a cavity, such as welding, swaging, and the like.

[75] Although a particular order of actions is illustrated in FIGs. 6 and 7, these actions may be performed in other temporal sequences. For example, the actions depicted in FIGs. 6 and 7 may be performed sequentially, concurrently, or simultaneously. Also, the blocks 640 and 650 can be performed before the blocks 620 and 630, and the blocks 620 and 640 may be performed before the blocks 630 and 650.

[76] The providing steps in the described methods of FIGs. 6 and 7 may include designing and/or manufacturing a golf club head. As an example, body 100 in FIG. 5 may be manufactured using a metal casting process. Furthermore, the described methods may be used to manufacture the other aspects of body 100 described with reference to FIGs. 1-5.

[77] Continuing with the figures, FIG. 8 presents a rear view of club head 800 of club head set 80. FIG. 9 presents a toe side view of club head 800. FIG. 10 illustrates a rear view of body 801 of club head 800, where club head 800 is in a disassembled state. Club head 800 is similar to club head 100 (FIGs. 1-5), and comprises loft angle 955 (FIG. 9) between front face 950 (FIG. 9) and shaft bore axis 806. In the present example of FIG. 9, shaft bore axis 806 is defined by a bore of hosel 805, but there can be other hosel-less examples where shaft bore axis 806 could be defined by a shaft bore at a heel of a club head body. In the present example of FIG. 8, club head 800 also comprises back portion 802 comprising back face 860 opposite front face 950 (FIG. 9) and extended between toe region 810 and heel region 820 of back portion 802. In some proposals, back portion 802 can also be referred to as a back side of club head 800. Club head 800 also comprises inserts 885 and 895 in the present embodiment. Insert 885 can be similar to weight 185 (FIGs. 1, 3), and can be inserted at back portion 802 into a cavity 1080 (FIG. 10) similar to cavity 180 of club head 100 (FIGs. 1, 3, 5). Lower toe insert 895 can be similar to weight 195 of club head 100 (FIGs. 1, 4). Club head 800 comprises part of club head set 80 of two or more golf clubs, as will be further discussed below.

[78] Club head 800 also comprises insert 862 located at insert base 863 at a center of back face 860 in the present embodiment. As shown in FIG. 8, insert 862 comprises a logo or other identifying characteristic related to club head 800. There can be examples where insert 862 can comprise materials such as those described for weight 185 and/or weight 195 in FIGs. 1, 3, and 4, such as to have an effect on sound, vibration, frequency, and/or mass distribution of club head 800.

[79] Club head 800 differs from club head 100 (FIGs. 1-5) by comprising support bars 861 coupled to back face 860 astride of, and equidistant from, center region 864. Support bars 861 comprise support bars 8611 at heel region 820, and support bar 8612 at toe region 810, both protruding from back face 860. There can be other examples, however, with a different number and/or different arrangement of support bars. For example, additional support bars may be positioned between support bar 8611 and the heel end of heel region 820. Similarly, additional support bars may be positioned between support bar 8612 and the toe end of toe region 810. In some examples, insert base 863 may be considered as also comprising one or more support bars. For example, base ends 8613 and 8614 of insert base 863 can also be considered in some examples as support bars protruding from back face 860. In addition, there can be examples where insert base 863 is protruding from back face 860, such that insert base 863 may itself be considered a support bar.

[80] In the present proposal, support bars 8611 and 8612 comprise substantially the same support bar width. In the same or other embodiments, the support bar width can be of approximately 0.03 inches (0.75 millimeters) to approximately 0.5 inches (12.7) millimeters).

Although the support bar width is constant for both support bars 8611 and 8612 in the example of FIG. 8, there can be other examples where the support bar width tapers or otherwise varies along a length of a support bar similar to support bar 8611 and/or 8612. In addition, although the support bar thickness also is constant for support bars 861 in the present example, there also can be examples where the support bar thickness can taper or otherwise vary, as measured from back face 860, along a length of a support bar similar to support bar 8611 and/or 8612.

[81] Support bars 861 are integral with back face 860 in the present proposal by comprising part of the same piece of material. For example, support bars 861 can be cast, forged, or machined along with back face 860. Alternatively, the support bars may not be integral with their respective back faces, but are securely attached thereto. In such examples, the support bars can be welded, brazed, epoxied, or otherwise adhered to the back faces.

[82] In the present proposal, support bar 8611 comprises angle 8615 facing center region 864 and measured from horizontal axis 807. Similarly, support bar 8612 also comprises angle 8616 facing center region 864 and measured from horizontal axis 807. Horizontal axis 807 is an axis bisecting club 800 into an upper half and a lower half. There can be examples where angles 8615 and/or 8616 comprise acute angles of approximately 30 degrees to approximately 90 degrees from horizontal axis 807. In the same or other examples, support bars 8611 and 8612 are angled for convergence towards center region 864. There can also be examples where angles 8615 and/or 8616 can be obtuse and/or of approximately 90 degrees to approximately 150 degrees from horizontal axis 807. Angles 8615 and 8616 both comprise approximately 68 degrees in the example of FIG. 8, but there can be other embodiments where angles 8615 and 8616 are not equal to each other, and/or where at least one of angles 8615 and/or 8616 are not acute relative to center region 864. Angles 8615 and/or 8616 may remain constant across the different club heads of club head set 80, or they may vary within the same club head set from club head to club head.

[83] FIG. 10 illustrates a rear view of body 801 of club head 800 in a disassembled state. Skipping ahead in the figures, FIG. 18 illustrates a cross-sectional view of club head 800 along line 18-18 from FIG. 8. Note that, for simplicity, details about lower toe insert 895 have been left out of FIG. 18, but insert 885 is shown as inserted into cavity 1080. As seen in FIGs. 8, 10, and 18, back portion 802 of club head 800 comprises back end 870 extended between heel region 820 and toe region 810, where back end 870 can be similar to second back 170 of club head 100 (FIGs. 1, 3-5). In some examples, back end 870 can be referred to as a back wall. Cavity 1080 is also located at back portion 802, between back face 860 and back end 870, and comprises cavity heel zone 1082, cavity toe zone 1083, cavity center zone 1181, cavity inner section 1084 located towards front face 950, and cavity outer section 1885 located towards back end 870. In the present example, cavity inner section 1084 is located opposite back face 860, and cavity outer section 1885 is located opposite back end 870. In the present example, as seen in FIG. 18, cavity 1080 is wider at cavity center zone 1181 than at either of cavity heel zone 1082 or cavity toe zone 1083. For example, cavity inner section 1084 is thinner, relative to front face 950, at cavity center zone 1181 than at either of cavity heel zone 1082 or cavity toe zone 1083. In some examples, cavity inner section 1084 can be referred to as a cavity inner wall, and/or cavity outer section 1885 can be referred to as a cavity outer wall.

[84] In the present example, a distance between front face 950 and an exposed surface of cavity inner section 1084 is greater at cavity heel zone 1082 and at cavity toe zone 1083 than at cavity center zone 1181. There can also be examples where a distance between back end 870 and an exposed surface of cavity outer section 1885 can be greater at cavity heel zone 1082 and at cavity toe zone 1083 than at cavity center zone 1181.

[85] Insert 885 comprises insert heel zone 1886, insert toe zone 1887, and insert center zone 1888 in the present example, and is shaped complementarily to cavity 1080 such that insert center zone 1888 is thicker than either of insert heel zone 1886 or insert toe zone 1887.

In the example of FIG. 18, insert heel and toe zones 1886 and 1887 are obtusely angled relative to each other along insert inner wall 1889 and about insert center zone 1888. Similarly, cavity inner section 1084 is obtusely angled complementarily to insert inner wall 1889. In the present example, cavity 1080 is configured such that insert 885 is insertable in a top-to-sole direction with respect to club head 800. There can also be examples where insert 885 can be interchangeable with other inserts of similar shape.

[86] In some examples, a material of body 801 of club head 800 can comprise a specific gravity of at least approximately 5.0 g/cm3, and/or a material of insert 885 can comprise a specific gravity of at least approximately 1.2 g/cm3. In the same or other examples, a mass of insert 885 can be of approximately 10 grams.

[87] The dimension relationships described above for and between cavity 1080 and insert 885 can be beneficial, for example, to permit adjustments in the distribution of mass for club head 800. In the present example, where a material of insert 885 is less dense than a material of body 801 of club head 800, the greater thickness of cavity inner section 1084 at cavity heel zone 1082 and at cavity toe zone 1083, relative to cavity center zone 1181, and the greater thickness of insert center zone 1888 relative to insert heel zone 1886 and insert toe zone 1887, can permit a redistribution of mass away from a center of club head 800 and towards heel and toe regions 820 and 810. As an example, a distribution of mass of cavity inner section 1084 is shifted towards heel region 820 and towards toe region 810 and away from cavity center zone 1181. Also, a distribution of mass of insert 885 is concentrated at insert center zone 1888 and diminishes towards insert heel zone 1886 and towards insert toe zone 1887.

[88] Such distributions of mass can augment the moment of inertia about a center region of club head 800, and improve gameplay by reducing club head twisting during off-center impacts. For example, due to the shapes and configurations described above, a portion of the moment of inertia contributed by cavity inner section 1084 at cavity heel zone 1082 and at cavity toe zone 1083 is greater than a portion of the moment of inertia contributed by insert 885 at insert heel zone 1886 and at insert toe zone 1887. Other shape and/or density relationships between insert 885 and cavity 1080 may be used to achieve different desired distributions of mass or moments of inertia in other embodiments.

[89] As shown in FIGs. 8 and 18, insert 885 is partially housed in cavity 1080, such that a grip portion of insert 885 protrudes outside cavity 1080 to allow or facilitate, for example, insertion or removal of insert 885 to or from cavity 1080. In other examples, however, insert 885 need not protrude from cavity 1080. Support bars 861 also extend from back face 860 to cavity inner section 1084 in the present example, and cavity inner section 1084 is at least as thick as support bars 861, relative to back face 860, so as to prevent support bars 861 from interfering with the insertion or removal of insert 885 into or out of cavity 1080.

[90] Backtracking through the figures, FIGs. 10-15 illustrate several views of exemplary club heads of club head set 80. FIG. 10 illustrates a rear view of body 801 of club head 800, where club head 800 is in a disassembled state. FIG. 11 illustrates a rear view of body 1101 of club head 1100 of club head set 80, where club head 1100 is in a disassembled state. FIG. 12 illustrates a rear view of body 1201 of club head 1200 of club head set 80, where club head [97] For a 2-iron head, the loft angle can comprise approximately 18 degrees to approximately 20 degrees, and the support bar width can comprise approximately 0.03 inches (0.75 millimeters) to approximately 0.2 inches (5.1 millimeters); [98] For a 3-iron head, the loft angle can comprise approximately 20 degrees to approximately 23 degrees, and the support bar width can comprise approximately 0.04 inches (1.0 millimeters) to approximately 0.21 inches (5.3 millimeters); [99] For a 4-iron head, the loft angle can comprise approximately 21 degrees to approximately 25 degrees, and the support bar width can comprise approximately 0.05 inches (1.3 millimeters) to approximately 0.23 inches (5.8 millimeters); [100] For a 5-iron head, the loft angle can comprise approximately 23 degrees to approximately 28 degrees, and the support bar width can comprise approximately 0.06 inches (1.5 millimeters) to approximately 0.26 inches (6.6 millimeters); [101] For a 6-iron head, the loft angle can comprise approximately 26 degrees to approximately 32 degrees, and the support bar width can comprise approximately 0.07 inches (1.8 millimeters) to approximately 0.30 inches (7.6 millimeters); [102] For a 7-iron head, the loft angle can comprise approximately 29 degrees to approximately 36 degrees, and the support bar width can comprise approximately 0.08 inches (2.0 millimeters) to approximately 0.34 inches (8.7 millimeters); [103] For a 8-iron head, the loft angle can comprise approximately 34 degrees to approximately 42 degrees, and the support bar width can comprise approximately 0.09 inches (2.3 millimeters) to approximately 0.39 inches (9.8 millimeters); [104] For a 9-iron head, the loft angle can comprise approximately 38 degrees to approximately 45 degrees, and the support bar width can comprise approximately 0.10 inches (2.5 millimeters) to approximately 0.44 inches (11.2 millimeters); and/or [105] For a wedge-iron head, the loft angle can comprise approximately 42 degrees to approximately 64 degrees, and the support bar width can comprise approximately 0.11 inches (2.8 millimeters) to approximately 0.50 inches (12.7 millimeters).

[106] In the same or other examples, one or more other characteristics or attributes of the support bars can vary, in addition to the support bar width, in a fashion similar to that described above for the support bar width. For example, in one embodiment, the other characteristic or attribute can comprise a support bar thickness, measured from the back face that may be incrementally varied according to the loft angle. In such an example, a thickness of support bars 1261 of club head 1200 in FIG. 12 could be thicker than a thickness of support bars 1161 of club head 1100 in FIG. 11, and/or a thickness of support bars 1161 of club head 1100 in FIG. 11 could be thicker than a thickness of support bars 861 of club head 800 in FIG. 10.

[107] The other characteristic or attribute can comprise a total number of support bars that may be incrementally varied according to the loft angle. Such an arrangement is illustrated in FIG. 17 for club head set 171, comprising club head 800, club head 1702 similar to club head 1100, and club head 1703 similar to club head 1200. In the example of FIG. 17, the loft angle for club head 1703 is greater than the loft angle for club head 1702, and the loft angle for club head 1702 is greater than the loft angle for club head 1701, such that the total number of support bars for club head 1703 is greater than the total number of support bars for club head 1702, and the total number of support bars for club head 1702 is greater than the total number of support bars for club head 1701. In one example not falling within the scope of the invention, the support bar width, thickness, and angle remains the same for each of the support bars in a single club head. In other examples, more than one characteristic or attribute is varied per club head, and/or support bars within a single club head can have different widths, thicknesses, and/or angles.

[108] The incorporation of support bars at the back faces of the club heads of club head sets as described above can be beneficial for several reasons. For example, the placement of support bars proximate to a center region at back face of a club head can increase support for the front face and/or face plate to better withstand stresses associated with impacts to golf balls. Such additional support can be useful in situations where the face plate thickness has been minimized for weight savings and/or weight redistribution considerations.

[109] In the case of short irons, such as wedge heads like club head 1200 in FIGs. 12 and 15, the placement of wider and/or thicker support bars such as support bars 1261 at back face 1260 just opposite to front face 1550 can have the effect of shifting the center of gravity of club head 1200 towards the front thereof. This shift can reduce a gear effect between front face 1550 and a golf ball, thereby limiting spin imparted onto the golf ball upon impact with front face 1550 for better trajectory control. In addition, better distance control and repeatability may be gained as a result of added face stability and reduced face deflection during impact due to the wider and/or thicker support bars. In some examples, similar results can also be achieved by having an increased number of support bars, such as in the case of support bars 1761 of club head 1703 in FIG. 17.

[110] In the case of long irons, such as 2-irons like club head 800 in FIGs. 8, 10, and 13, the moment of inertia of the club head can be increased for better control by decreasing the relevant characteristic or attribute of the support bars, whether it be support bar width, support bar thickness, and/or total number of support bars, such that more of the mass of club head 800 can be distributed towards the edges of front face 950 of club head 800 for increased moment of inertia. In addition, longer and/or more penetrating flight paths may be achieved due to the decreased relevant support bar characteristic by permitting greater flexure of the front face and/or face plate of the club head.

[111] Furthermore, in cases such as depicted for club head set 80, because the support bars are visible at the back face of the club heads, an increase in user confidence may be achieved for users that can appreciate the enhanced support, strength, and control features that the arrangement of support bars provides.

[112] Backtracking to FIG. 8, club head 800 also is shown as comprising lower toe insert 895 in addition to insert 885 and related cavity 1080 (FIG. 10). There can be, however, other examples comprising insert 885 and cavity 1080 without lower toe insert 895, and/or other examples comprising lower toe insert 895 without insert 885 and cavity 1080. Similar variations in features can be extended for other clubs of respective club head sets. For example, all or part of the club heads of club head set 80 may comprise lower toe inserts similar to lower toe insert 895, in addition to inserts and related cavities similar to insert 885 and related cavity 1080. There can also be examples where all or a portion of the club heads of a club head set may comprise inserts and related cavities similar to insert 885 and related cavity 1080, but may lack lower to inserts similar to lower toe insert 895. There can also be examples where all or a portion of the club heads of a club head set may comprise lower toe inserts similar to lower toe insert 895, but may lack inserts and related cavities similar to insert 885 and related cavity 1080.

[113] Continuing with FIG. 8, lower toe insert 895 can be similar to weight 195 of club head 100 (FIGs. 1, 4) and, in the present example, also comprises a weight. Lower toe insert 895 is located at lower toe section 811 of back portion 802, and although club head 800 comprises perimeter weight 875, lower toe insert 895 is located only at lower toe section 811. In the present example, lower toe insert 895 comprises a tungsten material and a specific gravity of approximately 10 g/cm3 In the present example, the other club heads of club head set 80 also comprise corresponding lower toe inserts similar to lower toe insert 895.

[114] In some examples, lower toe insert 895 and/or other similar inserts can be located at lower toe portion 811 to effect a redistribution of mass of club head 800. For example, lower toe insert 895 can be configured to shift the mass distribution of club head 800 away from center region 861 and towards toe region 810 and/or lower toe section 811 to thereby increase the moment of inertia of club head 800. In the same or other examples, lower toe insert 895 can be configured to counterbalance the mass of hosel 805 at the heel or upper heel portion of club head 800. By having hosel 805 and lower toe insert 895 substantially opposite each other, the distribution of mass of club head 800 can be shifted towards the ends of club head 800 to thereby increase its moment of inertia and forgiveness factor. In the same or other examples, the dimensions, location, and/or mass of lower toe insert 895 can be configured such as to adjust or align the center of gravity of club head 800 at a desired location relative to heel region 820 and/or toe region 810.

[115] As previously described, the loft angles of the club heads of club head set 80 are incrementally varied across the two or more club heads. In addition, characteristics or dimensions of the corresponding lower toe inserts may also be varied across the two or more club heads of club head set 80 in relation with the variation in loft angle. For instance, where each lower toe insert comprises two characteristics, the two characteristics can be inversely varied relative to each other for each lower toe insert across the club heads of club head set 80 as the loft angle is varied. As an example, a varied characteristic of the lower toe inserts may be incrementally varied, while an inverse characteristic of the lower toe inserts is decrementally varied as the loft angle changes.

[116] The variation in characteristics relative to loft angle can be further appreciated as presented in FIGs. 10-15, for the example of club head set 80, via club heads 800, 1100, and 1200. As seen in FIGs. 13-15, loft angle 1555 of club head 1200 is greater than loft angle 1455 of club head 1100, which in turn is greater than loft angle 955 of club head 800. Furthermore, for the present example, as loft angles increase from club head to club head, lower toe thicknesses, as measured along respective depth axes of the club heads, tend to increase from club head to club head. In the same and other examples, the lower toe thickness of a club head can be related and/or defined by a sole of the club head. As an example, lower toe thickness 15954 (FIG. 15) of club head 1200 is greater than lower toe thickness 14954 (FIG. 14) of club head 1100, which in turn is greater than lower toe thickness 13954 (FIG. 13) of club head 800. Similarly, lower toe thickness 13954 of club head 800 is defined by, and comprises a portion of, a thickness of sole 13001 (FIG. 13), while lower toe thickness 15954 of club head 1200 is defined by, and comprises a portion of, a thickness of sole 15001 (FIG. 15), such that the thickness of sole 15001 is greater than the thickness of sole 13001.

[117] In the example of club head set 80, the varied characteristic can be a depth of the lower toe insert, while the inverse characteristic can be an area of the lower toe insert. As an example, for club head 800, insert depth 13952 (FIG. 13) of lower toe insert 895 is measured along depth axis 13953, where depth axis 13953 traverses minimum distance point 13955 between lower toe insert 865 and front face 950, where insert area 8951 (FIGs. 8, 10) represents a cross-sectional area of lower toe insert 895 substantially perpendicular to depth axis 13953 and/or where depth axis 13953 is substantially parallel to sole 13001 (FIG. 13) and/or is substantially perpendicular to shaft bore axis 806. Similarly, for club head 1100, insert depth 14952 (FIG. 14) is measured along depth axis 14953, where depth axis 14953 traverses minimum distance point 14955 between lower toe insert 1195 and front face 1450, where insert area 11951 (FIG. 11) represents a cross-sectional area of lower toe insert 1195 substantially perpendicular to depth axis 14953, and/or where depth axis 14953 is substantially parallel to sole 14001 (FIG. 14) and/or is substantially perpendicular to shaft bore axis 1406. As another example, for club head 1200, insert depth 15952 (FIG. 15) is measured along depth axis 15953, where depth axis 15953 traverses minimum distance point 15955 between lower toe insert 1295 and front face 1550, and where insert area 12951 (FIG. 12) represents a cross-sectional area of lower toe insert 1295 substantially perpendicular to depth axis 15953, and/or where depth axis 15953 is substantially parallel to sole 15001 (FIG. 15) and/or is substantially perpendicular to shaft bore axis 1506. In such examples, where the varied characteristic of lower toe insert depth (13952, 14952, 15952) increases from club head 800 to club head 1200, the inverse characteristic of lower toe area (8991, 11951, 12951) decreases from club head 800 to club head 1200. In a different embodiment, the lower toe insert depth (13952, 14952, 15952) increases as the loft angle (955, 1455, 1555) increases.

[118] In the same or other examples, one of the characteristics or dimensions that vary can be a distance between a center of gravity of the lower toe insert and the front face of respective club head. For instance, a distance between the center of gravity of a lower toe insert and the front face of a corresponding lower-lofted club head can be greater than a distance between the center of gravity of a lower toe insert and the front face of a corresponding higher-lofted club head. As an example, distance 13957 between center of gravity 13956 of lower toe insert 895 and front face 950 of club head 800 (FIG. 13) is greater than distance 14957 between center of gravity 14956 of lower toe insert 1195 and front face 1450 of club head 1100 (FIG. 14), which in turn is greater than distance 15957 between center of gravity 15956 of lower toe insert 1295 and front face 1550 of club head 1200 (FIG. 15). In such examples, where the varied characteristic of lower toe insert depth (13952, 14952, 15952) increases from club head 800 to club head 1200, the inverse characteristic of center of gravity distance (13957, 14957, 15957) decreases from club head 800 to club head 1200. In a different embodiment, the center of gravity distance (13957, 14957, 15957) decreases as the loft angle (955, 1455, 1555) increases.

[119] The club head variations described above based on loft angle can permit the insert depths of the lower toe inserts to vary. For example, insert depth 15952 (FIG. 15) of insert 1295 is greater than insert depth 14952 (FIG. 14) of insert 1195, which in turn is greater than insert depth 13952 (FIG. 13) of lower toe insert 895. Furthermore, distances between the lower toe inserts and the respective club head front faces can vary accordingly. In the present example of club head 80, insert-to-face distance 1360 (FIG. 13) of club head 800 is of approximately .281 inches (7.14 millimeters), which is greater than insert-to-face distance 1460 (FIG. 14) of club head 1100 at approximately .233 inches (5.92 millimeters), which, in turn, is greater than insert-to-face distance 1560 (FIG. 15) of club head 1200 at approximately .195 inches (4.95 millimeters).

[120] Such variation in the insert depths of the lower toe inserts, in the distances between the lower toe inserts and their respective club head front faces, and/or in the distances between the center of gravity of the lower toe inserts and their respective club head front faces, can vary mass distribution for the club heads, thereby permitting the adjustment of certain qualities of the club heads.

[121] For example, by having shallower insert depths and/or larger insert-to-face distances for lower-lofted club heads, the center of gravity of such club heads can be moved away from the respective club head front faces, thereby increasing club head dynamic loft and imparted spin such as to allow higher launch angles and/or flight trajectories for impacted balls. Conversely, by having deeper insert depths and/or shallower insert-to-face distances for higher-lofted club heads, the center of gravity of such club heads can be moved closer to the respective club head front faces, thereby allowing for more penetrating flight paths for impacted balls.

[122] The variation in insert depth described above could lead to a variation in mass of the different lower toe inserts of the club heads. To counteract such mass variation, and the effects it could have on other qualities of the club heads, like the counterbalancing of respective hosels with respective lower toe inserts, other characteristics or dimensions of the lower toe inserts can be varied inversely with respect to the variation in insert depth. For example, as the insert depths of the lower toe inserts increase, an area of the lower toe inserts can be decreased, such that all lower toe inserts comprise substantially similar masses. In some proposals, a mass of each of the lower toe inserts of club head set 80 comprises approximately 10.25 grams. In the same or other examples, such mass may be of approximately 5 grams to approximately 50 grams. In the example of club head set 80, as insert depths vary by increasing from insert depth 13952 (FIG. 13) to insert depth 14952 (FIG. 14), and from insert depth 14952 to insert depth 15952 (FIG. 15), corresponding areas for the inserts inversely vary by decreasing from insert area 8951 (FIG. 10) to insert area 11951 (FIG. 11), and from insert area 11951 (FIG. 11) to insert area 12951 (FIG. 12).

[123] FIG. 19 illustrates an exemplary relationship between loft angle and the distances between lower toe inserts to front faces for the club head set 80. Skipping ahead in the figures, as seen in FIG. 23, relationships between front-face-to-lower-toe-weight distances and loft angle I club head number may lie within one or more ranges. For example, club head set 2381 comprises club heads with longer front-face-to-lower-toe-weight distances that vary from club head to club head as indicated in FIG. 23. Similarly, in another example, club head set 2382 comprises club heads with shorter front-face-to-lower-toe-weight distances that vary from club head to club head as also indicated in FIG. 23. The club heads of club head set 2381 can have soles that are generally wider, from front to back of the club head, than the soles of the club heads of club head set 2382. Other examples or rates of variation are also possible for other club head sets.

[124] In the same or other examples, front-face-to-lower-toe-weight distances may vary within certain ranges, depending on the loft angle and/or the club head number, for club heads of one or more club head sets. For instance: [125] A 2-iron front-face-to-lower-toe-weight distance can comprise approximately .050 inches (1.27 millimeters) to approximately 1.2 inches (28.08 millimeters); [126] A 3-iron front-face-to-lower-toe-weight distance can comprise approximately 0.048 inches (1.22 millimeters) to approximately 1.2 inches (28.08 millimeters); [127] A 4-iron front-face-to-lower-toe-weight distance can comprise approximately 0.046 inches (1.17 millimeters) to approximately 1.19 inches (27.85 millimeters); [128] A 5-iron front-face-to-lower-toe-weight distance can comprise approximately 0.044 inches (1.12 millimeters) to approximately 1.17 inches (27.38 millimeters); [129] A 6-iron front-face-to-lower-toe-weight distance can comprise approximately 0.042 inches (1.07 millimeters) to approximately 1.16 inches (27.14 millimeters); [130] A 7-iron front-face-to-lower-toe-weight distance can comprise approximately 0.040 inches (1.02 millimeters) to approximately 1.15 inches (26.91 millimeters); that a center of gravity of club head 1200 can be closer to front face 1550 than a center of gravity of club head 800 is to front face 950.

[137] In the present examples, both lower toe inserts 895 and 1295 are visible at their respective lower toe sections of club heads 800 and 1200. In some examples, such visibility of the lower toe inserts may inspire user confidence for users that can appreciate the enhanced performance and control features that the arrangement of the respective lower toe inserts provides. There can be other examples, however, where lower toe inserts may not be visible. For example, the interface between the lower toe insert 895 and lower toe section 811 may blend or otherwise become indiscernible after machining or polishing steps.

[138] In the example of club head set 80, club head 800 comprises perimeter weight 875 at a periphery of back portion 802, and club head 1200 comprises perimeter weight 1275 at a periphery of pack portion 1202. Perimeter weight 875 comprises a cavity at lower toe section 811, where lower toe insert 895 is located. Similarly, perimeter weight 1275 comprises a cavity at lower toe section 1211, where lower toe insert 1295 is located. As a result, the lower toe inserts can be integrated with their respective perimeter weights while still being located only at their respective lower toe sections. In addition, in the present example, lower toe insert 1295 is incompatible with the cavity of lower toe section 811 in club head 800, while lower toe insert 895 is incompatible with the cavity of lower toe section 1211 in club head 1200.

[139] Forging ahead, FIG. 20 illustrates a flowchart of method 2000 for providing a club head set. In some examples, the club head set of method 2000 can be similar to club head set 80 of FIGs. 8-16 and 18-19, and/or to club head set 171 of FIG. 17.

[140] Block 2010 of method 2000 comprises providing a first club head of a club head set, the first club head comprising one or more first support bars coupled to the first back face, the one or more first support bars comprising a first support bar characteristic. In some examples, the first club head can be similar to club head 1200 (FIGs. 12, 15, 16, 19), and the one or more first support bars can be similar to support bars 1261 (FIG. 12) coupled to back face 1260, or to support bars 1761 (FIG. 17) coupled to back face 1760. In the same or other examples, the first support bar characteristic can comprise a support bar width, a support bar thickness, and/or a total number of support bars. cavity 1280 of club head 1200 (FIG. 12), which can also be similar to cavity 1080 of club head 800 (FIG. 10). Also, the first club head can further comprise a first insert comprising an insert heel zone, an insert toe zone and an insert center zone, where the first insert is configured to be at least partially housed in the first cavity, and each of the insert heel and toe zones are thinner than the insert center zone. The first insert can comprise an insert inner wall complementary to the cavity inner wall, such that the insert heel and toe zones are obtusely angled relative to each other along the insert inner wall and about the insert center zone, and/or such that the cavity inner wall is obtusely angled complementarily to the insert inner wall. In some examples, the first inset can be similar to insert 885, as described above for FIGs. 8, and 18. Such arrangements may beneficial, for example, to redistribute mass away from a center of the club head to augment the moment of inertia thereof, as described above with respect to insert 885 and cavity 1080 of club head 800 (FIGs. 8, 10).

[147] In some examples, some of the blocks of method 2000 can be subdivided into one or more sub-blocks. For example, block 2010 can be subdivided into several sub-blocks as described above for providing different portions of the first club head, such as the cavity and the insert at the back portion thereof.

[148] In the same or other examples, one or more of the different blocks of method 2000 can be combined into a single block or performed simultaneously, and/or the sequence of such blocks can be changed. For example, block 2030 can occur simultaneously with block 2010 for the first club head, and can occur simultaneously with block 2020 for the second club head. In addition, block 2040 can occur simultaneously with block 2030. In another example, all of the details of the first club head can be performed in a first block, and all of the details of the second club head can be performed in a second block.

[149] There can also be examples where method 2000 can comprise further or different blocks. As an example, method 2000 can also comprise individual blocks similar to blocks 2010 and/or 2020 for each of the two or more club heads of the club head set of method 2000.

[155] There can be implementations where the relationship above between the first and second areas of the first and second weights can be achieved by varying respective lengths and widths of the first and second weights. For example, the a second length of the second weight can be made greater than a first length of the first weight, and/or a second width of the second weight can be made greater than a first width of the first weight. In the example of club head set 80, where area 8951 (FIG. 10) is defined by length 8952 and width 8953 of lower toe insert 895, and where area 12951 (FIG. 12) is defined by length 12952 and width 12953, area 8951 of lower toe insert 895 can be greater than area 12951 of lower toe insert 1295 as a result of length 8952 being greater than length 12952, and/or as a result of width 8953 being greater than width 12953. In the present example, length 8952 and width 8953 of lower toe insert 895 are substantially the similar to each other, measuring approximately .475 inches (12.06 millimeters), while length 12952 and width 12953 of lower toe insert 1295 are also substantially similar to each other, measuring approximately .425 inches (10.8 millimeters). The corresponding length and width of lower insert weight 1195 (FIG. 11) measure approximately .450 inches (11.43 millimeters). There can be other examples, however, where the length and area of a lower toe insert need not be substantially similar to each other.

[156] In some examples, block 2140 of method 2100 can further comprise providing a second minimum distance from the second weight to the second front face to be greater than a first minimum distance from the first weight to the first front face. In the same or other examples, block 2140 can also comprise providing a center of gravity of the first club head to be closer to the first front face than what a center of gravity of the second club head is to the second front face. For example, the second minimum distance can be similar to insert-to-face distance 1560 between lower toe insert 1295 and front face 1550 of club head 1200 (FIG. 15), while the first minimum distance can be similar to insert-to-face distance 1360 between lower toe insert 895 and front face 950 of club head 800 (FIG. 13). In the same or other examples, such arrangement may allow the center of gravity of higher-lofted club heads, like club head 1200, to be closer to their respective front faces than the center of gravity of lower lofted club heads like club head 800.

[157] There can also be examples of method 2100 where an insert can be provided for location in a cavity at a back portion of a club head of the club head set of method 2100, similar to as described above for method 2000 and/or with respect to cavities 1080 (FIG. 10) and 1280 (FIG. 12) of club heads 800 and 1200, respectively, and inserts similar to insert 885 (FIG. 8, 18). For instance, the cavity inner wall of the cavity may be thinner at the cavity center zone than at the cavity heel and toe zones. Similarly, the insert center zone may be thicker than the insert heel and toe zones for said insert. Such arrangements may beneficial, for example, to redistribute mass away from a center of the club head to augment the moment of inertia thereof, as described above with respect to insert 885 and cavity 1080 of club head 800 (FIGs. 8, 10).

[158] There also can be examples of method 2100 where the description above for can be extended throughout a portion or all of the two or more club heads of the club head set. For example, method 2100 could comprise providing two or more club heads of the club head set, and inversely varying the depth and area of the lower toe inserts as the loft angles of the respective club heads increase across the two or more club heads of the club head set.

[159] In some examples, some of the blocks of method 2100 can be subdivided into one or more sub-blocks. For example, block 2110 can be subdivided into several sub-blocks as described above for providing different portions of the first club head, such as the cavity and the insert at the back portion thereof. As another example, block 2140 also can comprise providing a mass of the second weight to be substantially similar to a mass of the first weight. Similar provisions can also be made across method 2100 such that the masses of all lower toe inserts of the club head set are substantially similar to each other.

[160] In the same or other examples, one or more of the different blocks of method 2100 can be combined into a single block or performed simultaneously, and/or the sequence of such blocks can be changed. For example, block 2110 can occur simultaneously with block 2120 for the first club head, and/or block 2130 can occur simultaneously with block 2140 for the second club head.

[161] There can also be examples where method 2100 can comprise further or different blocks. As an example, method 2100 can also comprise individual blocks similar to blocks 2110 and/or 2120 for each of the two or more club heads of the club head set of method 2100. Other variations can be implemented for method 2400 without departing from the scope of the present disclosure.

[168] Continuing with the figures, FIG. 25 presents a rear view of club head 25000 of club head set 250. FIG. 26 presents a rear view of club head 26000 of club head set 250, and FIG. 27 presents a rear view of club head 27000, also of club head set 250. Club head set 250 comprises one or more club heads, such as club heads 25000 (FIG. 25), 26000 (FIG. 26), and 27000 (FIG. 27), having respective diagonal stabilizing bars at their back faces. As will be described below, such diagonal stabilizing bars can be used for strengthening the club heads by reducing club head deformation and/or inhibiting vibrations with the club heads upon impact with a golf ball. In addition, in the same or other examples, such diagonal stabilizing bars may be angled, depending on the loft angle of the club heads, to be aligned with a strike path of the club head so as to better reinforce the club heads against deformation and/or absorb vibrations along expected impact points or paths, and/or to provide better desired directionality control for the impacted golf ball.

[169] In the example of FIG. 25, club head 25000 is shown as a wedge iron head comprising back face 25100 opposite a strike face thereof. There can be other examples, however, where other types of club heads may be used, such as irons or iron-like club heads of higher or lower loft. Club head 25000 also comprises toe region 25210, heel region 25220, toe end 25230, heel end 25240, top rail or top end 25250, and sole or bottom end 25260. Vertical axis 25290 extends through top end 25250 and bottom end 25260, splitting club head 25000 between heel region 25220 and toe region 25210.

[170] In the present example, back face 25100 of club head 25000 comprises cavity 25300 located at toe region 25210, where cavity 25300 comprises cavity base 25310, and cavity wall 25320 bounding at least a portion of cavity base 25310. Cavity base 25310 is sunk in relative to perimeter 25110 of back face 25100 in the present example, such that perimeter 25110 protrudes above cavity base 25310 and defines at least a portion of cavity wall 25320. There can be other examples, however, where cavity wall 25320 may not completely bound cavity base 25310, and/or where perimeter 25110 may not protrude above cavity base 25310. In some examples, perimeter 25110 is a perimeter weight, and/or cavity 25300 is located within or below a larger rear cavity defined by perimeter 25110. Although cavity 25300 is located only at toe region 25210 in the present embodiment, there can be other examples where cavity 25300 may extend at least partially into heel region 25220 [171] Back face 25100 also comprises stabilizing bar 25400 protruded from cavity base 25310 and extending diagonally relative to vertical axis 25290. The length of stabilizing bar 25400 may extend fully or partially across cavity base 25310, depending on the embodiment.

As seen in FIG. 25, bar axis 25410 extends along a length of stabilizing bar 25400, being intersected with vertical axis 25290, and extending therefrom to the high toe portion of back face 25100, towards toe end 25230 and top end 25250. In some examples, a thickness or height of stabilizing bar 25400 from cavity base 25310, and/or of other stabilizing bars of club head set 250, may be of approximately 0.010 inch to approximately 0.25 inch. In the same or other examples, a width of stabilizing bar 25400, and/or of other stabilizing bars or other club heads of club head set 250, may be of approximately 0.050 inch to approximately 0.75 inch. In the same or other examples, the thickness or width of stabilizing bar 25400 may vary along its length, such as to increase or decrease towards the high toe portion of back face 25100. In the present example, bar axis 25410 is angled at bar angle 25420 of approximately 43 degrees relative to vertical axis 25290. There can be examples where the angle between vertical axis 25290 and bar axis 25410 may range from approximately 40 degrees to approximately 50 degrees. Depending on the club head, other club heads of club head set 250 may comprise bar angles, similar to bar angle 25420, of approximately 25 degrees to approximately 65 degrees between their respective vertical and bar axes.

[172] Skipping ahead in the figures, FIG. 28 illustrates a top x-ray view of club head 25000 along strike path 28100 and poised to strike golf ball 28500. In the present example, stability bar 25400 is angled at bar angle 25420 (FIG. 25), relative to vertical axis 25290 (FIG. 25), such that bar axis 25410 (FIG. 25) is substantially aligned with strike path 28100 when club head 25000 is proximate to impact point 28600 with golf ball 28500. As a result, stability bar 25400 is better positioned to receive, attenuate, and/or dissipate impact stresses and/or frequencies along its length upon impact with golf ball 28500 than if stability bar 25400 were aligned, for path 28100 (FIG. 28) when club head 27100 is at a target open face impact angle greater than the target open face impact angle described above for club head 26000 (FIG. 26).

[176] Consistent with the description above, in the present example, club head 25000 (FIG. 25) comprises a loft of approximately 52 degrees, comprises bar angle 25420 of approximately 43 degrees, and is configured for a target open face impact angle 28700 of approximately 37 degrees. Club head 26000 (FIG. 26) comprises a loft of approximately 56 degrees, comprises bar angle 26420 of approximately 44 degrees, and is configured for a target open face impact angle of approximately 38 degrees. Club head 27000 (FIG. 27) comprises a loft of approximately 60 degrees, comprises bar angle 27420 of approximately 47 degrees, and is configured for a target open face impact angle 28700 of approximately 42 degrees.

[177] In the same or other examples, club head set 250 may comprise, in addition to, or instead of one or more of club heads 25000, 26000, and/or 27000, other club heads with different loft angles and corresponding characteristics. For instance, club head set 250 may comprise club heads with lofts of 50, 54, and/or 58 degrees, and/or lower lofted irons, with corresponding bar angle and target open face impact angle characteristics.

[178] Several ranges can be implemented for the values described above. For example, there can be embodiments where club head 25000 (FIG. 25), club head 26000 (FIG. 26), club head 27000 (FIG. 27), and/or another club head of club head set 250 can comprise a loft of approximately 45 degrees to approximately 70 degrees, can comprise a bar angle of approximately 40 degrees to approximately 50 degrees, and/or can be configured for a target open face impact angle of approximately 30 degrees to approximately 50 degrees. In the same or other embodiments, where lower lofted irons are included, the lofts may range from approximately 18 degrees to approximately 70 degrees, and the bar angles may range from approximately 25 degrees to 65 degrees.

[179] As can be seen in FIGs. 25-27, the club heads of club head set 250 comprise hourglass supports towards the middle of their respective back faces. As an example, club head 25000 comprises hourglass support 25600 protruding from back face 25100, where hourglass support 25600 comprises top portion 25630, bottom portion 25640, and middle portion 25650. Hourglass support 25600 also comprises toe sidewall 25610 and heel sidewall 25620, defining [190] Next, block 31100 can comprise sub-block 31120 for providing a first cavity on the first back face at the first toe region of the first club head. The first cavity can be similar to first cavity 25300 (FIG. 25), and may comprise a first cavity base similar to cavity base 25310, and a first cavity wall bounding the first cavity base and similar to cavity wall 25320 (FIG. 25). In some examples, a perimeter of the first club head may protrude above the first cavity base and/or define a portion of the first cavity wall, such as seen in FIG. 25 with respect to perimeter 25110 protruding above cavity base 25310. In the same or other examples, the first back face may be configured such that the first cavity is located only at the first toe region of the first club head.

[191] Block 31100 of method 31000 can also comprise sub-block 31130 for providing the first diagonal stabilizing bar within and protruded from the first cavity, and angled at a first bar angle relative to a vertical axis of the first club head. The first diagonal stabilizing bar may be similar to stabilizing bar 25400 (FIG. 25), and may comprise a first bar axis extending along a length of the first bar, similar to bar axis 25410 (FIG. 25). The first bar axis can be aligned to intersect the first vertical axis, and to extend therefrom towards a high toe portion of the first club head. In some examples, the first diagonal stabilizing bar may be forged or cast with the first club head, and/or may be machined therefrom. There can be other examples where the first diagonal stabilizing bar does not comprise a single piece of material with the first back face.

[192] There can be examples where the first bar axis can be angled at the first bar angle such that the first bar axis can be substantially aligned with a strike path of the first club head when the first club head is proximate to an impact point with a golf ball along the strike path. In some examples, such alignment of the first bar axis and/or the first stabilizing bar can be as described above with respect to FIG. 28 for stabilizing bar 25400 relative to strike path 28100. In the same or other examples, the alignment of the first bar axis and/or of the first stabilizing bar can be configured with respect to target face impact angles as described above with respect to the club heads of FIGs. 25-28.

[193] There can also be other configurations for the first diagonal stabilizing bar. As an example, in some proposals, at least one of a thickness or a width of the first diagonal stabilizing bar may be configured to increase towards the first top end of the first club head, as described above with respect to FIGs. 25 and 29. As another example, a second diagonal stabilizing bar may be located in the first cavity, parallel to the first diagonal stabilizing bar, as described with respect to FIG. 30. In such examples, the second diagonal stabilizing bar may be thicker and/or wider than the first diagonal stabilizing bar, and can be located closer to the first toe end of the first club head than the first diagonal stabilizing bar.

[194] In some examples, block 31100 may further comprise sub-block 31140 for providing a first hourglass support protruded from the first back face. There can be examples where the first hourglass support may be similar to hourglass support 25600 (FIG. 25). The first hourglass support may be machined at the first back face in some examples, but there can also be examples where the first hourglass support need not comprise a single piece of material with the first back face. In some implementations, the first hourglass support may comprise top, bottom, and middle portions that may be respectively similar to top portion 25630, bottom portion 25640, and/or middle portion 25650 of hourglass support 25600 (FIG. 25). The first hourglass support may also comprise heel and toe hourglass sidewalls, which may be respectively similar to heel sidewall 25620 and/or toe sidewall 25610 of hourglass support 25600 (FIG. 25). In some implementations, the toe hourglass sidewall may protrude above the first cavity of block 31120, and/or may comprise a portion of the first cavity wall. There can also be examples where a top segment of the toe hourglass sidewall can be substantially parallel to the first bar axis of the first diagonal stabilizing bar. In the same or other examples, the toe hourglass sidewall can be nonlinear along the middle hourglass portion of the first hourglass support, as seen for toe sidewall 25610 in FIG. 25. In the same or other implementations, the heel hourglass sidewall may protrude above a second cavity of the first club head. For example, such second cavity can be located at the heel region of the first club head, and/or can be similar to cavity 25700 (FIG. 25) in some embodiments.

[195] Block 31100 may comprise, in some examples, sub-block 31150 for providing a first toe weight comprising a first weight surface angled at a first weight angle and facing a heel region of the first club head. The first toe weight can be located at the first toe region and towards the first bottom end of the first club head, and the first weight surface can face towards the first heel region at a first weight angle relative to the first vertical axis of the first club head. In some examples, the first toe weight can be similar to toe weight 25800, and the first weight surface can be similar to weight surface 25810 (FIG. 25). In the same or other example, the first toe weight can be similar to insert 895 (FIG. 8), such as by comprising similar material(s).

[196] In some examples, method 31000 can comprise block 31200 for providing a second club head comprising a second diagonal stabilizing bar. The second club head can be similar, in some examples to another one of the club heads of club head set 250, such as one of club heads 26000 (FIG. 26) or 27000 (FIG. 27).

[197] Block 31200 comprises sub-block 31210 for providing the second diagonal stabilizing bar angled at a second bar angle greater than the first bar angle. In some examples, the loft of the second club head of block 31200 can be greater than the loft of the first club head of block 31100, such that bar angles increase with increasing lofts. In some proposals, the second diagonal stabilizing bar can be similar to stabilizing bar 26400 at bar angle 26420 (FIG. 26) [198] Block 31200 can also comprise, in some examples, sub-block 31220 for providing a second toe weight with a second weight surface angled at a second weight angle greater than the first weight angle. There can be examples where the second toe weight can be similar to toe weight 26800 with weight surface 26810.

[199] In some examples, one or more of the different blocks of method 31000 can be combined into a single block or performed simultaneously, and/or the sequence of such blocks can be changed. For example, sub-blocks 31120 and 31130 may be carried out concurrently with sub-block 31110 in some examples, such as when casting, forging, and/or machining the first club head. In the same or other examples, some of the blocks of method 31000 can be subdivided into several sub-blocks. For example, sub-block 31150 may comprise a sub-block for coupling the first toe weight to the first club head, such as by welding or via adhesives.

There can also be examples where method 31000 can comprise further or different blocks. As an example, another block similar to block 31100 and/or corresponding sub-blocks 31110, 31120, 31130, 31140, and/or 31150 may be provided for providing a third club head comprising a third diagonal stabilizing bar, such as for club head 27000 (FIG. 27) or other club heads of club head set 250. In addition, there may be examples where method 31000 can comprise only part of the steps described above. For instance, sub-block 31150 may be optional in some embodiments.

[200] Continuing with the figures, FIG. 32 presents a rear view of club head 32000 of club head set 3200. Meanwhile, FIG. 33 presents a rear view of club head 33000, FIG. 34 presents a rear view of club head 34000, and FIG. 35 presents a rear view of club head 3500, each also being part of club head set 3200. Club head set 3200 comprises one or more club heads, such as club heads 32000 (FIG. 32), 33000 (FIG. 33), 34000 (FIG. 34), and 35000 (FIG. 35), having two or more stabilization bars (e.g., stabilization bars 32011 (FIG. 32), stabilization bars 33011 (FIG. 33), stabilization bars 34011 (FIG. 34), and stabilization bars 35011 (FIG. 35)) at their back faces. As will be described below, such stabilization bars can permit a center of gravity and a deflection of each club head of club head set 3200 (FIGs. 32-35) to be customized according to a desired and/or a predetermined club-specific performance of each club head.

[201] For example, loft angle can be utilized to categorize each of the club heads in a club head set (e.g., club head set 3200). More specifically, under this convention, the loft angle can determine the corresponding club head number (e.g., 3, 4, 5, 6, 7, 8, 9, pitching wedge (PW), etc.) for each club head, and each club head number can correspond with a different loft angle. Generally speaking, the club head number of each club head can increase as the loft angle of each club head increases. Under this same convention, the loft angle/club head number can identify the respective club-specific performance (e.g., intended hitting distance and/or corresponding trajectory of a golf ball) of each club head. Lower club head numbers, such as club head numbers 3 and 4, for example, can be referred to as “long irons” and, thus, can be used when longer hitting distance club-specific performance is desired. On the other hand, higher numbered club head numbers, such as club head numbers 8 and 9, for example, can be referred to as “short irons” and, thus, can be used when shorter hitting distance club-specific performance is desired.

[202] For longer hitting distance club-specific performance, transfer of ball speed at contact of the club head with a golf ball can be emphasized. For shorter hitting distance club-specific performance, transfer of spin to the golf ball at contact of the club head with the golf ball can be emphasized. While the loft angle can affect the transfer of ball speed and spin to the golf ball to some extent, this effect can be negligible in comparison to the effects provided by other physical characteristics of the club heads, such as center of gravity and deflection of each of the club heads. For example, the position of the center of gravity of the club head can substantially affect the transfer of spin and the launch angle of the golf ball. Meanwhile, the deflection of the club head in combination with the loft angle of the club head can substantially affect the transfer of ball speed and the flight trajectory of a golf ball. Further details of these effects are described below with respect to proportions (3) through (8).

[203] In conventional club head sets, where the only variation between each of the club heads of the club head set is the loft angle, the center of gravity and the deflection properties of the club heads of the conventional club head set can remain relatively unchanged across each of the club heads. However, as detailed below, through incorporation and customization of the two or more stabilization bars (e.g., stabilization bars 32011 (FIG. 32), stabilization bars 33011 (FIG. 33), stabilization bars 34011 (FIG. 34), and stabilization bars 35011 (FIG. 35)) of each of the club heads (e.g., club heads 32000 (FIG. 32), 33000 (FIG. 33), 34000 (FIG. 34), and 35000 (FIG. 35)) of club head set 3200, the center of gravity and the deflection properties of the club heads of club head set 3200 can be changed according to the club-specific performance of each of the club heads while maintaining a similar appearance of each of the club heads throughout club head set 3200.

[204] Referring now to the drawings, FIG. 32 illustrates club head 32000 as a 9-iron club head. There can be other examples, however, where other types of club heads can be used, such as irons or iron-like club heads of higher or lower loft. Club head 32000 can comprise front face 32001, toe 32002, heel 32003, top rail or top end 32004, sole or bottom end 32005, back portion 32006, and vertical axis 32007. Front face 32001 can operate as the surface configured to strike a golf ball.

[205] Back portion 32006 can comprise back face 32008. Back portion 32006 and back face 32008 can be opposite front face 32001. Meanwhile, back face 32008 can comprise toe region 32009, heel region 32010, and two or more stabilization bars 32011.

The stabilization bars 32011 protrude from back face 32008. Stabilization bars 32011 can be visible at back face 32008. Likewise, stabilization bars 32011 can be integral and/or coupled with back face 32008. Stabilization bars 32011 can be configured such that the edges of stabilization bars 32011 transition smoothly into back face 32008.

[206] In many examples, toe 32002 can be located closer to toe region 32009 than to heel region 32010, and heel 32003 can be located closer to heel region 32010 than to toe region 32009. Vertical axis 32007 can extend substantially perpendicularly through top end 32004 and/or bottom end 32005 such that vertical axis 32007 partially defines toe region 32009 and heel region 32010. Accordingly, in some examples, vertical axis 32007 can split back face 32008 into toe region 32009 and heel region 32010.

[207] Stabilization bars 32011 can comprise toe stabilization bar 32014 at toe region 32009 and heel stabilization bar 32015 at heel region 32010. Toe stabilization bar 32014 can diverge from vertical axis 32007 as toe stabilization bar 32014 approaches toe 32002. Meanwhile, heel stabilization bar 32015 can diverge from vertical axis 32007 as heel stabilization bar 32015 approaches heel 32003. In other examples, stabilization bars 32011 can comprise one or more additional toe stabilization bars similar to and/or parallel to toe stabilization bar 32014 at toe region 32009. Likewise, stabilization bars 32011 can comprise one or more additional heel stabilization bars similar to and/or parallel to heel stabilization bar 32015 at heel region 32010. In various examples, each toe stabilization bar (e.g., toe stabilization bar 32014) can correspond to a heel stabilization bar (e.g., heel stabilization bar 32015) while in other embodiments, stabilization bars 32011 can comprise more toe stabilization bars than heel stabilization bars, or vice versa.

[208] Toe stabilization bar 32014 can comprise toe stabilization bar axis 32016. Toe stabilization bar axis 32016 can define toe stabilization bar reference angle 32017 with vertical axis 32007. Likewise, heel stabilization bar 32015 can comprise heel stabilization bar axis 32018. Heel stabilization bar axis 32018 can define heel stabilization bar reference angle 32020 with vertical axis 32007. Accordingly, for the purposes of this disclosure, vertical axis 32007 can operate as the zero angle reference frame for any reference angles (e.g., toe stabilization bar reference angle 32017, heel stabilization bar reference angle 32020) of stabilization bars 32011. measured with respect to a location (e.g., a midpoint, an endpoint, any other suitable reference location, etc.) of heel stabilization bar 32015. The convention(s) chosen for toe stabilization bar 32014 can be the same or can be different from that of heel stabilization bar 32015.

[211] In many examples, toe stabilization bar axis 32016 can be parallel with, collinear with, and/or can intersect toe stabilization bar length 32023. In the same or different embodiments, toe stabilization bar axis 32016 can be parallel with, collinear with, and/or can intersect an edge of toe stabilization bar 32014 that is nearest to toe 32002. Meanwhile, heel stabilization bar axis 32018 can be parallel with, collinear with, and/or can intersect heel stabilization bar length 32024. In the same or different examples, heel stabilization bar axis can be parallel with, collinear with, and/or can intersect an edge of heel stabilization bar 32015 that is nearest to heel 32003.

[212] In many proposals, toe stabilization bar reference angle 32017 can be approximately equal to heel stabilization bar reference angle 32020. In other proposals, toe stabilization bar reference angle 32017 and heel stabilization bar reference angle 32020 can be different. In the same or different proposals, toe stabilization bar width 32021, the toe stabilization bar thickness, and/or toe stabilization bar length 32023 can be approximately equal to heel stabilization bar width 32022, the heel stabilization bar thickness, and/or heel stabilization bar length 32024, respectively. In other proposals, one or more of toe stabilization bar width 32021, the toe stabilization bar thickness, and/or toe stabilization bar length 32023 can differ from heel stabilization bar width 32022, the heel stabilization bar thickness, and/or heel stabilization bar length 32024, respectively.

[213] Back portion 32006 can comprise perimeter weight 32012. Perimeter weight 32012 can be a weight that protrudes from back portion 32006 such that perimeter weight 32012 partially defines toe region 32009 and heel region 32010. Accordingly, perimeter weight 32012 can also define cavity 32013 of back portion 32006. In these examples, stabilization bars 32011 can be located within cavity 32013.

[214] Meanwhile, back portion 32006 can also comprise tuning port 32025. Tuning port 32025 can be configured to receive one or more inserts (e.g., weights, tags, etc.). In many examples, each of stabilization bars 32011 can extend from tuning port 32025 to perimeter weight 32012. In some examples falling outside the scope of the invention, tuning port 32025 can be omitted. In these or other examples, each of stabilization bars 32011 can extend across back portion 32006 and/or back face 32008, such as, from one region of perimeter weight 32012 to another region of perimeter weight 32012.

[215] In various examples, tuning port 32025 can be configured such that tuning port 32025 is angled with respect to vertical axis 32007. Accordingly, tuning port 32025 can comprise a tuning port tilt angle. The tuning port tilt angle can be defined between a line intersecting vertical axis 32007 and a line substantially bisecting tuning port 32025.

[216] In some examples, stabilization bars 32011 (e.g., toe stabilization bar 32014 and/or heel stabilization bar 32015) can be configured such that a stabilization bar width (e.g., toe stabilization bar width 32021 and/or heel stabilization bar width 32022) and/or a stabilization bar thickness (e.g., the stabilization bar thickness of toe stabilization bar 32014 and/or the stabilization bar thickness of heel stabilization bar 32015) tapers and/or curves to converge toward a stabilization bar axis (e.g., toe stabilization bar axis 32016 and/or heel stabilization bar axis 32018). Alternatively, the stabilization bar thickness can remain constant.

[217] Although not illustrated in the drawings, in some examples, toe stabilization bar 32014 and heel stabilization bar 32015 of stabilization bars 32011 can merge into an integral stabilization bar. In these examples, toe stabilization bar width 32021 and heel stabilization bar width 32022 each can become sufficiently wide that toe stabilization bar 32014 and heel stabilization bar 32015 contact each other at vertical axis 32007. As a result, toe stabilization bar 32014 and heel stabilization bar 32015 can merge to form the integral stabilization bar, as described above. While any club heads of club head set 3200 can be implemented with an integral stabilization bar configuration, these examples can be particularly likely to be implemented for club heads of club head set 3200 comprising higher loft angles (e.g., an 8-iron club head, a 9-iron club head (e.g., club head 32000), and/or a wedge head club head (e.g., club head 35000 (FIG. 35)), which follows from the manner in which the club heads of club head set 32000 vary, as described in detail below. stabilization bar axis 33016, toe stabilization bar reference angle 33017, toe stabilization bar width 33021, the toe stabilization bar thickness of toe stabilization bar 33014, and toe stabilization bar length 33023 can be similar to toe stabilization bar axis 32016, toe stabilization bar reference angle 32017, toe stabilization bar width 32021, the toe stabilization bar thickness of toe stabilization bar 32014, and toe stabilization bar length 32023, respectively, of FIG. 32.

Likewise, heel stabilization bar axis 33018, heel stabilization bar reference angle 33020, heel stabilization bar width 33022, the heel stabilization bar thickness of heel stabilization bar 33015, and heel stabilization bar length 33024 can be similar to heel stabilization bar axis 32018, heel stabilization bar reference angle 32020, heel stabilization bar width 32022, the heel stabilization bar thickness of heel stabilization bar 32015, and heel stabilization bar length 32024, respectively, of FIG. 32.

[222] Turning to the next drawing, FIG. 34 illustrates club head 34000 as a 3-iron club head. There can be other examples, however, where other types of club heads can be used, such as irons or iron-like club heads of higher or lower loft. Club head 34000 can comprise front face 34001, toe 34002, heel 34003, top rail or top end 34004, sole or bottom end 34005, back portion 34006, and vertical axis 34007. Back portion 34006 can comprise back face 34008 opposite front face 34001. Meanwhile, back face 34008 can comprise toe region 34009, heel region 34010, and two or more stabilization bars 34011. Furthermore, back portion 34006 can comprise tuning port 34025 and perimeter weight 34012, and perimeter weight 34012 can define cavity 34013 of back portion 34006.

[223] Front face 34001, toe 34002, heel 34003, top end 34004, bottom end 34005, back portion 34006, and vertical axis 34007 can be similar to front face 32001, toe 32002, heel 32003, top end 32004, bottom end 32005, back portion 32006, and vertical axis 32007, respectively. Back face 34008, toe region 34009, heel region 34010, and stabilization bars 34011 can be similar to back face 32008, toe region 32009, heel region 32010, and stabilization bars 32011, respectively. Likewise, tuning port 34025, perimeter weight 34012, and cavity 34013 can be similar to tuning port 32025, perimeter weight 32012, and cavity 32013, respectively, of FIG. 32.

[224] Stabilization bars 34011 can comprise toe stabilization bar 34014 at toe region 34009 and heel stabilization bar 34015 at heel region 34010. Toe stabilization bar 34014 can comprise toe stabilization bar axis 34016, and toe stabilization bar axis 34016 can define toe stabilization bar reference angle 34017 with vertical axis 34007. Likewise, heel stabilization bar 34015 can comprise heel stabilization bar axis 34018, and heel stabilization bar axis 34018 can define heel stabilization bar reference angle 34020 with vertical axis 34007. Meanwhile, toe stabilization bar 34014 can comprise toe stabilization bar width 34021, a toe stabilization bar thickness (not shown) of toe stabilization bar 34014, and toe stabilization bar length 34023. Likewise, heel stabilization bar 34015 can comprise heel stabilization bar width 34022, a heel stabilization bar thickness (not shown) of heel stabilization bar 34015, and heel stabilization bar length 34024.

[225] Toe stabilization bar 34014 can be similar to toe stabilization bar 32014, and heel stabilization bar 34015 can be similar to heel stabilization bar 32015. Accordingly, toe stabilization bar axis 34016, toe stabilization bar reference angle 34017, toe stabilization bar width 34021, the toe stabilization bar thickness of toe stabilization bar 34014, and toe stabilization bar length 34023 can be similar to toe stabilization bar axis 32016, toe stabilization bar reference angle 32017, toe stabilization bar width 32021, the toe stabilization bar thickness of toe stabilization bar 32014, and toe stabilization bar length 32023, respectively, of FIG. 32. Likewise, heel stabilization bar axis 34018, heel stabilization bar reference angle 34020, heel stabilization bar width 34022, the heel stabilization bar thickness of heel stabilization bar 34015, and heel stabilization bar length 34024 can be similar to heel stabilization bar axis 32018, heel stabilization bar reference angle 32020, heel stabilization bar width 32022, the heel stabilization bar thickness of heel stabilization bar 32015, and heel stabilization bar length 32024, respectively, of FIG. 32.

[226] Turning to the next drawing again, FIG. 35 illustrates club head 35000 as a wedge head club head. There can be other examples, however, where other types of club heads can be used, such as irons or iron-like club heads of higher or lower loft. Club head 35000 can comprise front face 35001, toe 35002, heel 35003, top rail or top end 35004, sole or bottom end 35005, back portion 35006, and vertical axis 35007. Back portion 35006 can comprise back face 35008 opposite front face 35001. Meanwhile, back face 35008 can comprise toe region stabilization bar width 35022, the heel stabilization bar thickness of heel stabilization bar 35015, and heel stabilization bar length 35024 can be similar to heel stabilization bar axis 32018, heel stabilization bar reference angle 32020, heel stabilization bar width 32022, the heel stabilization bar thickness of heel stabilization bar 32015, and heel stabilization bar length 32024, respectively, of FIG. 32.

[230] The club heads in FIGs. 32-35 can each be part of club head set 3200, but differ from each other by comprising different loft angles. In the present example, the loft angle of club head 32000 (FIG. 32) is greater than the loft angle of club head 33000 (FIG. 33), and the loft angle of club head 33000 (FIG. 33) is greater than the loft angle of club head 34000 (FIG. 34). Meanwhile, the loft angle of club head 35000 (FIG. 35) is greater than the loft angles of club head 32000 (FIG. 32), club head 33000 (FIG. 33), and club head 34000 (FIG. 34). Club head set 3200 can be configured such that an attribute/characteristic of the two or more stabilization bars for each club head (e.g., club head 32000 (FIG. 32), club head 33000 (FIG. 33), club head 34000 (FIG. 34), club head 35000 (FIG. 35)) of club head set 3200 can vary (e.g., incrementally) across one or more of the club heads of club head set 3200 as the loft angle varies incrementally across the club heads of club head set 3200. For example, the attribute/characteristic of stabilization bars 32011 (FIG. 32) can be greater than or approximately equal to a corresponding attribute/characteristic of stabilization bars 33011 (FIG. 33). Likewise, the attribute/characteristic of stabilization bars 33011 (FIG. 33) can be greater than or approximately equal to a corresponding attribute/characteristic of stabilization bars 34011 (FIG. 34). Meanwhile, the attribute/characteristic of stabilization bars 35011 (FIG. 35) can be greater than or approximately equal to a corresponding attribute/characteristic of stabilization bars 32011 (FIG. 32). Accordingly, in some examples, the attribute/characteristic of the two or more stabilization bars for each club head (e.g., club head 32000 (FIG. 32), club head 33000 (FIG. 33), club head 34000 (FIG. 34), club head 35000 (FIG. 35)) of club head set 3200 can vary for each variation in the loft angle of the club heads. In other examples, the attribute/characteristic can only vary between some of the club heads. In any event, in various examples, the attribute/characteristic of a higher numbered club head (i.e., a club head having a greater loft angle) can be at least approximately equal to if not greater than the corresponding attribute/characteristic of any lower numbered club head of club head set 3200. Meanwhile, in other examples, the attribute/characteristic of the two or more stabilization bars can vary equally for each of the two or more stabilization bars of one or more club heads of club head set 3200 or can vary unequally. However, if the attribute/characteristic of one stabilization bar of the two or more stabilization bars of the one or more club heads of club head set 3200 varies unequally, each stabilization bar of the two or more stabilization bars can vary with respect to the attribute/characteristic by at least the same extent.

[231] The attribute/characteristic of the two or more stabilization bars can comprise a respective width of each of the two or more stabilization bars (e.g., across toe stabilization bar width 32021 (FIG. 32), toe stabilization bar width 33021 (FIG. 33), toe stabilization bar width 34021 (FIG. 34), and/or toe stabilization bar width 35021 (FIG. 35); and across heel stabilization bar width 32022 (FIG. 32), heel stabilization bar width 33022 (FIG. 33), heel stabilization bar width 34022 (FIG. 34), and/or heel stabilization bar width 35022 (FIG. 35)). The attribute/characteristic of the two or more stabilization bars can also comprise a respective thickness of each of the two or more stabilization bars (e.g., across the toe stabilization bar thicknesses of FIG. 32, FIG. 33, FIG. 34, and/or FIG. 35; and across the heel stabilization bar thicknesses of FIG. 32, FIG. 33, FIG. 34, and/or FIG. 35). Similarly, the attribute/characteristic of the two or more stabilization bars can further comprise a total quantity of the two or more stabilization bars (e.g., stabilization bars 32011 (FIG. 32), stabilization bars 33011 (FIG. 33), stabilization bars 34011 (FIG. 34), and/or stabilization bars 35011 (FIG. 35)). The attribute/characteristic of the two or more stabilization bars can also comprise a respective reference angle of each of the two or more stabilization bars (e.g., across toe stabilization bar reference angle 32017 (FIG. 32), toe stabilization bar reference angle 33017 (FIG. 33), toe stabilization bar reference angle 34017 (FIG. 34), and/or toe stabilization bar reference angle 34017 (FIG. 34)); and across heel stabilization bar reference angle 32020 (FIG. 32), heel stabilization bar reference angle 33020 (FIG. 33), heel stabilization bar reference angle 34020 (FIG. 34), and/or heel stabilization bar reference angle 35020 (FIG. 35)).

[232] Where the attribute/characteristic comprises the total quantity of the two or more stabilization bars, there can be an exception to the concept that higher numbered club head (i.e., a club head having a greater loft angle) can be at least approximately equal to if not greater than the corresponding attribute/characteristic of any lower numbered club head of club head set 3200. For example, in these examples, it is possible that higher numbered club heads might implement fewer stabilization bars than lower numbered club heads. Still, the reference angles and/or stabilization bar widths can typically be configured according to expressions (1) and (2), where theta represents the reference angle, where d represents the stabilization bar width for at least one stabilization bar of the stabilization bars of each of the club heads of club head set 3200, and where the sub-script corresponds to the club head number of the club head: [233] [234] [235] Meanwhile, where the attribute/characteristic comprises (a) a respective width of each of the two or more stabilization bars and/or (b) a respective thickness of each of the two or more stabilization bars, the respective width of the each of the two or more stabilization bars and/or the respective thickness of the each of the two or more stabilization bars can be measured at a corresponding reference location (e.g., a midpoint, an endpoint, any other suitable repeatable location, etc.) of each of the two or more stabilization bars for each club head and/or across each club head of club head set 3200 (FIGs. 32-35). For example, in some examples, the respective widths of toe stabilization bar 32014 (FIG. 32) and heel stabilization bar 32015 (FIG. 32) can be measured at a midpoint of toe stabilization bar 32014 (FIG. 32) and a midpoint of heel stabilization bar 32015 (FIG. 32), respectively. Meanwhile, for whichever convention of measurement is chosen, the convention can then be maintained for making measurements of widths and/or thicknesses of the stabilization bars for each of the other club heads in club head set 3200. For example, if the respective width of toe stabilization bar 32014 (FIG. 32) is measured at a midpoint of toe stabilization bar 32014, the respective width of toe stabilization bar 33014 (FIG. 33) can also be measured at a midpoint of toe stabilization bar 33014. Likewise, if the respective width of heel stabilization bar 32015 (FIG. 32) is measured at a midpoint of heel stabilization bar 32015, the respective width of heel stabilization bar 33015 (FIG. 33) can also be measured at a midpoint of heel stabilization bar 33015 (FIG. 33).

[246] Proportion (7) provides that the change in the center of gravity of each of the club heads of club head set 3200 (FIGs. 32-35) is proportional to the change in the spin of the golf ball; and [247]

[248] Proportion (8) provides that the change in the center of gravity of each of the club heads of club head set 3200 (FIGs. 32-35) is proportional to the reciprocal of the change in the launch angle of the golf ball.

[249] For exemplary purposes, toe stabilization bar reference angle 32017 (FIG. 32) can comprise an angle greater than or equal to approximately 30 degrees and less than or equal to approximately 90 degrees. Meanwhile, toe stabilization bar reference angle 33017 (FIG. 33) can comprise an angle of greater than or equal to approximately 30 degrees and less than or equal to approximately toe stabilization bar reference angle 32017 (FIG. 32). Furthermore, toe stabilization bar reference angle 34017 (FIG. 34) can comprise an angle of greater than or equal to approximately 30 degrees and less than or equal to approximately toe stabilization bar reference angles 32017 (FIG. 32) and 33017 (FIG. 33). Further still, toe stabilization bar reference angle 35017 (FIG. 35) can comprise an angle of greater than or equal to approximately toe stabilization bar reference angle 32017 (FIG. 32) and less than or equal to approximately 90 degrees.

[250] Meanwhile, toe stabilization bar width 32021 (FIG. 32) can comprise a width greater than or equal to approximately 1.270 millimeters and less than or equal to approximately 10.16 millimeters (or greater than or equal to approximately 2.030 millimeters and less than or equal to approximately 7.620 millimeters); toe stabilization bar width 33021 (FIG. 33) can comprise a width of greater than or equal to approximately 1.270 millimeters (or greater than or equal to approximately 2.030 millimeters) and less than or equal to approximately toe stabilization bar width 32021; and toe stabilization bar width 34021 (FIG. 34) can comprise a width of greater than or equal to approximately 1.270 millimeters (or greater than or equal to approximately 2.030 millimeters) and less than or equal to approximately toe stabilization bar widths 33021 (FIG. 33) and 34021 (FIG. 34). For these examples, toe

stabilization bar width 35021 (FIG. 35) can comprise a width greater than or equal to approximately toe stabilization bar width 32021 (FIG. 32) and less than or equal to approximately 10.16 millimeters (or less than or equal to approximately 7.620 millimeters).

[251] Furthermore, the toe stabilization bar thickness of toe stabilization bar 32014 (FIG. 32) can comprise a thickness greater than or equal to approximately 0.6080 millimeters and less than or equal to approximately 6.350 millimeters (or greater than or equal to approximately 1.270 millimeters and less than or equal to approximately 5.080 millimeters); the toe stabilization bar thickness of toe stabilization bar 33014 (FIG. 33) can comprise a thickness of greater than or equal to approximately 0.6080 millimeters (or greater than or equal to approximately 1.270 millimeters) and less than or equal to approximately the toe stabilization bar thickness of toe stabilization bar 32014 (FIG. 32); and the toe stabilization bar thickness of toe stabilization bar 34014 (FIG. 34) can comprise a thickness of greater than or equal to approximately 0.6080 millimeters (or greater than or equal to approximately 1.270 millimeters) and less than or equal to approximately the toe stabilization bar thicknesses of toe stabilization bar 32014 (FIG. 32) and toe stabilization bar 33014 (FIG. 33). For these examples, the toe stabilization bar thickness of toe stabilization bar 35014 (FIG. 35) can comprise a thickness greater than or equal to approximately the toe stabilization bar thickness of toe stabilization bar 32014 (FIG. 32) (FIG. 32) and less than or equal to approximately 6.350 millimeters (or less than or equal to approximately 5.080 millimeters).

[252] Likewise, the total quantity of stabilization bars 32011 (FIG. 32), stabilization bars 33011 (FIG. 33), stabilization bars 34011 (FIG. 34), and stabilization bars 35011 (FIG. 35) can comprise a quantity greater than or equal to two and less than or equal to eight. FIG. 36 illustrates an exemplary club head 36000 of club head set 3600 comprising six stabilization bars 36030. Club heads 36000 can be similar to club head 32000 (FIG. 32), and club head set 3600 can be similar to club head set 3200. Stabilization bars 36030 can be similar to stabilization bars 32011 (FIG. 32).

[253] The lengths of stabilization bars 32011 (FIG. 32) (e.g., toe stabilization bar length 32023 and/or heel stabilization bar length 32024), the lengths of stabilization bars 33011 (FIG. 33) (e.g., toe stabilization bar length 33023 and/or heel stabilization bar length 33024), the lengths of stabilization bars 34011 (FIG. 34) (e.g., toe stabilization bar length 34023 and/or heel stabilization bar length 34024), and/or the lengths of stabilization bars 35011 (FIG. 35) (e.g., toe stabilization bar length 35023 and/or heel stabilization bar length 35024) can be greater than or equal to approximately 2.540 millimeters and less than or equal to approximately 40.64 millimeters (or less than or equal to approximately 30.48 millimeters).

[254] In line with the club head number convention described previously, in many examples, each club head of club head set 3200 (FIGs. 32-35) can comprise one of a 2-iron head, a 3-iron head, a 4-iron head, a 5-iron head, a 6-iron head, a 7-iron head, an 8-iron head, a 9-iron head, or a wedge head (e.g., a pitching wedge). Accordingly, club head 32000 (FIG. 32), club head 33000 (FIG. 33), club head 34000 (FIG. 34), and/or club head 35000 (FIG. 35) can be different ones of a 2-iron head, a 3-iron head (e.g., club head 34000), a 4-iron head, a 5-iron head, a 6-iron head (e.g., club head 33000), a 7-iron head, an 8-iron head, a 9-iron head (e.g., club head 32000), or a wedge head (e.g., club head 35000).

[255] In these proposals, the 2-iron head can comprise a 2-iron loft angle of approximately 18 degrees to approximately 20 degrees. Meanwhile, the 2-iron head can comprise a 2-iron toe stabilization bar width of greater than or equal to approximately 0.5 millimeters and less than or equal to approximately 5.1 millimeters, a 2-iron heel stabilization bar width of greater than or equal to approximately 0.5 millimeters and less than or equal to approximately 5.1 millimeters, a 2-iron toe stabilization bar reference angle of greater than or equal to approximately 35 degrees and less than or equal to approximately 95 degrees, and/or a 2-iron heel stabilization bar reference angle of greater than or equal to approximately 40 degrees and less than or equal to approximately 100 degrees. Furthermore, the 2-iron head can comprise a 2-iron tuning port tilt angle of approximately 5 degrees.

[256] In these proposals, the 3-iron head can comprise a 3-iron loft angle of approximately 20 degrees to approximately 23 degrees. Meanwhile, the 3-iron head can comprise a 3-iron toe stabilization bar width of greater than or equal to approximately 0.8 millimeters and less than or equal to approximately 5.8 millimeters, a 3-iron heel stabilization bar width of greater than or equal to approximately 0.8 millimeters and less than or equal to approximately 5.8 millimeters, a 3-iron toe stabilization bar reference angle of greater than or equal to approximately 31 degrees and less than or equal to approximately 93 degrees, and/or a 3- iron heel stabilization bar reference angle of greater than or equal to approximately 36 degrees and less than or equal to approximately 98 degrees. Furthermore, the 3-iron head can comprise a 3-iron tuning port tilt angle of approximately 5.25 degrees.

[257] In these proposals, the 4-iron head can comprise a 4-iron loft angle of approximately 21 degrees to approximately 25 degrees. Meanwhile, the 4-iron head can comprise a 4-iron toe stabilization bar width of greater than or equal to approximately 1.0 millimeters and less than or equal to approximately 6.7 millimeters, a 4-iron heel stabilization bar width of greater than or equal to approximately 1.0 millimeters and less than or equal to approximately 6.7 millimeters, a 4- iron toe stabilization bar reference angle of greater than or equal to approximately 27 degrees and less than or equal to approximately 91 degrees, and/or a 4-iron heel stabilization bar reference angle of greater than or equal to approximately 32 degrees and less than or equal to approximately 96 degrees. Furthermore, the 4-iron head can comprise a 4-iron tuning port tilt angle of approximately 5.5 degrees.

[258] In these proposals, the 5-iron head can comprise a 5-iron loft angle of approximately 23 degrees to approximately 28 degrees. Meanwhile, the 5-iron head can comprise a 5-iron toe stabilization bar width of greater than or equal to approximately 1.3 millimeters and less than or equal to approximately 7.1 millimeters, a 5-iron heel stabilization bar width of greater than or equal to approximately 1.3 millimeters and less than or equal to approximately 7.1 millimeters, a 5- iron toe stabilization bar reference angle of greater than or equal to approximately 22 degrees and less than or equal to approximately 88 degrees, and/or a 5-iron heel stabilization bar reference angle of greater than or equal to approximately 28 degrees and less than or equal to approximately 94 degrees. Furthermore, the 5-iron head can comprise a 5-iron tuning port tilt angle of approximately 6 degrees.

[259] In these proposals, the 6-iron head can comprise a 6-iron loft angle of approximately 26 degrees to approximately 32 degrees. Meanwhile, the 6-iron head can comprise a 6-iron toe stabilization bar width of greater than or equal to approximately 1.5 millimeters and less than or equal to approximately 8.0 millimeters, a 6-iron heel stabilization bar width of greater than or equal to approximately 1.5 millimeters and less than or equal to approximately 8.0 millimeters, a 6-iron toe stabilization bar reference angle of greater than or equal to approximately 18 degrees and less than or equal to approximately 86 degrees, and/or a 6- iron heel stabilization bar reference angle of greater than or equal to approximately 24 degrees and less than or equal to approximately 92 degrees. Furthermore, the 6-iron head can comprise a 6-iron tuning port tilt angle of approximately 6.5 degrees.

[260] In these proposals, the 7-iron head can comprise a 7-iron loft angle of approximately 29 degrees to approximately 36 degrees. Meanwhile, the 7-iron head can comprise a 7-iron toe stabilization bar width of greater than or equal to approximately 1.8 millimeters and less than or equal to approximately 8.0 millimeters, a 7-iron heel stabilization bar width of greater than or equal to approximately 1.8 millimeters and less than or equal to approximately 8.0 millimeters, a 7- iron toe stabilization bar reference angle of greater than or equal to approximately 14 degrees and less than or equal to approximately 84 degrees, and/or a 7-iron heel stabilization bar reference angle of greater than or equal to approximately 20 degrees and less than or equal to approximately 90 degrees. Furthermore, the 7-iron head can comprise a 7-iron tuning port tilt angle of approximately 6.5 degrees.

[261] In these proposals, the 8-iron head can comprise a 8-iron loft angle of approximately 34 degrees to approximately 42 degrees. Meanwhile, the 8-iron head can comprise a 8-iron toe stabilization bar width of greater than or equal to approximately 2.0 millimeters and less than or equal to approximately 8.0 millimeters, a 8-iron heel stabilization bar width of greater than or equal to approximately 2.0 millimeters and less than or equal to approximately 8.0 millimeters, a 8- iron toe stabilization bar reference angle of greater than or equal to approximately 10 degrees and less than or equal to approximately 82 degrees, and/or a 8-iron heel stabilization bar reference angle of greater than or equal to approximately 16 degrees and less than or equal to approximately 88 degrees. Furthermore, the 8-iron head can comprise a 8-iron tuning port tilt angle of approximately 6.5 degrees.

[262] In these proposals, the 9-iron head can comprise a 9-iron loft angle of approximately 38 degrees to approximately 45 degrees. Meanwhile, the 9-iron head can comprise a 9-iron toe stabilization bar width of greater than or equal to approximately 2.3 millimeters and less than or equal to approximately 8.3 millimeters, a 9-iron heel stabilization bar width of greater than or equal to approximately 2.3 millimeters and less than or equal to approximately 8.3 millimeters, a 9-iron toe stabilization bar reference angle of greater than or equal to approximately 6 degrees and less than or equal to approximately 80 degrees, and/or a 9-iron heel stabilization bar reference angle of greater than or equal to approximately 12 degrees and less than or equal to approximately 86 degrees. Furthermore, the 9-iron head can comprise a 9-iron tuning port tilt angle of approximately 6.5 degrees.

[263] In these proposals, the wedge head iron can comprise a wedge loft angle of approximately 42 degrees to approximately 64 degrees. The wedge head iron can comprise a wedge toe stabilization bar width of greater than or equal to approximately 2.5 millimeters and less than or equal to approximately 8.5 millimeters, a wedge heel stabilization bar width of greater than or equal to approximately 2.5 millimeters and less than or equal to approximately 8.5 millimeters, a wedge toe stabilization bar reference angle of greater than or equal to approximately 1 degree and less than or equal to approximately 77 degrees, and/or a wedge heel stabilization bar reference angle of greater than or equal to approximately 8 degrees and less than or equal to approximately 84 degrees. Furthermore, the wedge head iron can comprise a wedge head tuning port tilt angle of approximately 7 degrees.

[264] Moving along, FIG. 37 illustrates a flowchart of method 37000 for providing a golf club head set. In some examples, the golf club head set of method 37000 can be similar to golf club head set 3200 described with respect to FIGs. 32-35, and/or to golf club head set 3600 (FIG. 3) comprising one or more club heads similar to that club head 36000 (FIG. 36).

[265] Block 37100 of method 37000 can comprise providing a first club head. In some examples, the first club head can be similar to one of the club heads of club head set 3200 (FIGs. 32-35) and/or club head set 3600 (FIG. 36), such as club head 32000 (FIG. 32) or club head 36000 (FIG. 36). The first club head can comprise a first loft angle similar or identical to loft angle 32001 (FIG. 32). Meanwhile, the first club head can also comprise two or more first stabilization bars, which can be similar or identical to stabilization bars 32011 (FIG. 32). Accordingly, the first stabilization bars can comprise a first stabilization bar characteristic. The first stabilization bar characteristic can be similar or identical to the attribute/characteristic of the stabilization bars described above with respect to FIGs. 32-35. The first club can be provided, for example, via a casting or forging process.

[266] Block 37200 of method 37000 can comprise providing a second club head. The second club head can be similar, in some examples, to another one of the club heads of club head set 3200 (FIGs. 32-35) and/or club head set 3600 (FIG. 36), such as one of club head 32000 (FIG. 32), club head 33000 (FIG. 33), or club head 34000 (FIG. 34). The second club head can comprise a second loft angle similar or identical to one of loft angle 32001 (FIG. 32), loft angle 33001 (FIG. 33), or loft angle 34001 (FIG. 34), depending on that club head of club head 32000 (FIG. 32), club head 33000 (FIG. 33), and club head 34000 (FIG. 34) to which the second club head corresponds. Meanwhile, the second club head can also comprise two or more second stabilization bars, which can be similar or identical to stabilization bars 32011 (FIG. 32), 33011 (FIG. 33), or 34011 (FIG. 34), as applicable. Accordingly, the second stabilization bars can comprise a second stabilization bar characteristic, which can be similar or identical to the attribute/characteristic of the stabilization bars described above with respect to FIGs. 32-34. The second club can also be provided, for example, via a casting or forging process.

[267] In many proposals, block 37100 can comprise sub-block 37110 of providing the first loft angle to be greater than the second loft angle. Meanwhile, block 37100 can also comprise sub-block 37120 of providing the first stabilization bar characteristic to be greater than the second stabilization bar characteristic. In the same or different proposals, block 37200 can comprise sub-block 37210 of providing the second loft angle to be less than the first loft angle. Meanwhile, block 37200 can also comprise sub-block 37220 of providing the second stabilization bar characteristic to be less than the first stabilization bar characteristic. As a matter of course, performing sub-block 37110 can occur as a result of or as part of performing sub-block 37210, and vice versa. Likewise, performing sub-block 37120 can occur as a result of or as part of performing sub-block 37220, and vice versa.

[268] Sub-block 37110 can comprise (a) sub-block 37111 of providing a respective first width of each of the first stabilization bars to be greater than a respective second width of each of the second stabilization bars, (b) sub-block 37112 of providing a respective first thickness of each of the first stabilization bars to be greater than a respective second thickness of each of the second stabilization bars, (c) sub-block 37113 of providing a first quantity of the first stabilization bars to be greater than a second quantity of the second stabilization bars, and/or (d) sub-block 37114 of providing a respective first reference angle of each of the first stabilization bars to be greater than a respective second reference angle of each of the second stabilization bars. Likewise, sub-block 37210 can comprise (a) sub-block 37211 of providing a respective second width of each of the second stabilization bars to be less than a respective first width of each of the first stabilization bars, (b) sub-block 37212 of providing a respective second thickness of each of the second stabilization bars to be less than a respective first thickness of each of the first stabilization bars, (c) sub-block 37213 of providing a second quantity of the second stabilization bars to be less than a first quantity of the first stabilization bars, and/or (d) sub-block 37214 of providing a respective second reference angle of each of the second stabilization bars to be less than a respective first reference angle of each of the first stabilization bars. The first widths and second widths of sub-blocks 37111 and 37211 can be similar or identical to the first widths and second widths described above with respect to FIGs. 32-35. The first thicknesses and second thicknesses of sub-blocks 37112 and 37212 can be similar or identical to the first thicknesses and second thicknesses described above with respect to FIGs. 32-35. The first quantity of the first stabilization bars and the second quantity of the second stabilization bars of sub-blocks 37113 and 37213 can be similar or identical to the first quantity of the first stabilization bars and the second quantity of the second stabilization bars described above with respect to FIGs. 32-35. The first reference angles and the second reference angles of sub-blocks 37114 and 37214 can be similar or identical to the first reference angles and the second reference angles described above with respect to FIGs. 32-35.

[269] Sub-block 37111 and 37211 can be performed simultaneously or together as part of the same procedure. In the same or different proposals, sub-block 37112 and 37212 can be performed simultaneously or together as part of the same procedure. In the same or different embodiments, sub-block 37113 and 37213 can be performed simultaneously or together as part of the same procedure. In the same or different proposals, sub-block 37114 and 37214 can be performed simultaneously or together as part of the same procedure.

[270] Meanwhile, performing sub-block 37120 can comprise customizing a first center of gravity and/or a first deflection of the first club head to a predetermined, first club-specific performance of the first club head. Likewise, performing sub-block 37220 can comprise customizing a second center of gravity and/or a second deflection of the second club head to a predetermined, second club-specific performance of the second club head.

[271] There can be examples where the description above for method 37000 can be extended throughout the two of more club heads of the club head set. For example, method 37000 could comprise providing two or more club heads, providing different loft angles of multiple loft angles for each of the two or more club heads such that each of the multiple loft angles vary from each other, and providing one stabilization bar characteristic of multiple stabilization bar characteristics for two or more stabilization bars of each of the two or more club heads such that the one stabilization bar characteristic varies for each of the two or more club heads according to the different loft angles of each of the two or more club heads. In such an example, the two or more clubs heads comprise the first club head of block 37100 and the second club head of block 37200. Meanwhile, the multiple loft angles comprise the first loft angle of block 37100 and the second loft angle of block 37200, and the multiple stabilization bar characteristics comprise the first stabilization bar characteristic of block 37100 and the second stabilization bar characteristic of block 37200. In the same or other examples, providing the different loft angles of the multiple loft angles for each of the two or more club heads can comprise incrementally varying the different loft angles for each of the two or more club heads across the club head set. Likewise, providing the one stabilization bar characteristic of the multiple stabilization bar characteristics can comprise incrementally varying the one stabilization bar characteristic for each of the two or more clubs heads across the club head set to correspond with incrementally varying the different loft angles for each of the two or more club heads across the club head set.

[272] Although the club head sets with varying characteristics and related methods have been described with reference to specific examples, various changes can be made without departing from the scope of the disclosure.

It is intended that the scope of the club head sets with varying characteristics in accordance with the invention shall be limited only to the extent required by the appended claims.

Claims

1. A golf club head set comprising: two or more golf club heads, each comprising: a loft angle; a front face; a back face opposite the front face; a tuning port; and two or more stabilization bars protruded from the back face and extending from the tuning port; wherein: the loft angle varies incrementally across the two or more golf club heads; and a respective reference angle of each of the two or more stabilization bars varies incrementally across each of the two or more golf club heads as the loft angle varies incrementally across each of the two or more golf club heads; a change in deflection of each of the two or more golf club heads of the golf club head set is proportional to the reciprocal of a change in the respective reference angles and respective widths of the two or more stabilization bars of the two or more golf club heads the respective reference angle is measured with respect to a respective vertical axis relative to a ground surface when each of die two or more golf club heads are at a respective address position.

2. The golf club head set of claim 1, wherein: the respective reference angle of each of the two or more stabilization bars varies for each variation in the loft angle.

3. The golf club head set of claim 1, wherein: the respective reference angle of each of the two or more stabilization bars varies equally for each variation in loft angle.

4. A golf club head set comprising: a first golf club head comprising: a first loft angle; a first front face; a first toe; a first heel; a first top end; a first bottom end; a first back portion comprising a first back face opposite the first front face, the first back face comprising: a first toe region; a first heel region, the first toe being located closer to the first toe region than to the first heel region and the first heel being located closer to the first heel region than to the first toe region; a tuning port; and two or more first stabilization bars extending from the tuning port and comprising: a respective width of each of the two or more first stabilization bars that vary across each of the two or more golf club heads of the golf club head set; a respective reference angle of each of the two or more first stabilization bars that vary across each of the two or more golf club heads of the golf club head set; wherein the change in deflection of the first golf club head of the golf club head set is proportional to the reciprocal of the change in the reference angles and respective widths of the two or more first stabilization bars of the first golf club head; the respective reference angle is measured with respect to a first vertical axis relative to a ground surface when the first golf club head is at an address position and the first vertical axis defines the first toe region and the first heel region; and a second golf club head comprising: a second loft angle; a second front face; a second toe; a second heel; a second top end; a second bottom end; a second back portion comprising a second back face opposite the second front face, the second back face comprising: a second toe region; a second heel region, the second toe being located closer to the second toe region than to the second heel region and the second heel being located closer to the second heel region than to the second toe region; a tuning port; and two or more second stabilization bars extending from the tuning port and comprising a respective width of each of the two or more second stabilization bars that vary across each of the two or more golf club heads of the golf club head set; a respective reference angle of each of the two or more second stabilization bars that vary across each of the two or more golf club heads of the golf club head set; wherein the change in deflection of the second golf club head of the golf club head set is proportional to the reciprocal of the change in reflective angles and the respective widths of the two or more second stabilization bars of the second golf club head the respective reference angle is measured with respect to a second vertical axis relative to a ground surface when the second golf club head is at an address position and the second vertical axis defines the second toe region and the second heel region; wherein: the first loft angle is greater than the second loft angle; a first respective reference angle of each of the two or more first stabilization bars is incrementally greater than a second respective reference angle of each of the two or more second stabilization bars; the first respective reference angle is measured with respect to the first vertical axis; and the second respective reference angle is measured with respect to the second vertical axis.

5. The golf club head set of claim 4, wherein: the two or more first stabilization bars further comprise: a first stabilization bar thickness of each of the two or more first stabilization bars; and the two or more second stabilization bars further comprise: a second stabilization bar thickness of each of die two or more second stabilization bars.

6. The golf club head set of claim 4, wherein: the attribute of the two or more first stabilization bars comprises: a total quantity of the two or more first stabilization bars; and the attribute of the two or more second stabilization bars comprises: a total quantity of the two or more second stabilization bars.

7. The golf club head set of claim 4, wherein: the first back portion comprises a first perimeter weight protruding from the first back portion, the first perimeter weight partially defining each of the first toe region and the first heel region; and the second back portion comprises a second perimeter weight protruding from the second back portion, the second perimeter weight partially defining each of the second toe region and the second heel region.

8. The golf club head set of claim 4, wherein at least one of: the two or more first stabilization bars are visible at the first back face, and the two or more second stabilization bars are visible at the second back face; or the two or more first stabilization bars are integral with the first back face, and the two or more second stabilization bars are integral with the second back face.

9. The golf club head set of claim 4, wherein: the two or more first stabilization bars comprise: a first toe stabilization bar at the first toe region; and a first heel stabilization bar at the first heel region; and the two or more second stabilization bars comprise: a second toe stabilization bar at the second toe region; and a second heel stabilization bar at the second toe region.

10. The golf club head set of claim 9, wherein: the first toe stabilization bar diverges from the first vertical axis as the first toe stabilization bar approaches the first toe; the first heel stabilization bar diverges from the first vertical axis as the first heel stabilization bar approaches the first heel; the second toe stabilization bar diverges from the second vertical axis as the second toe stabilization bar approaches the second toe; and the second heel stabilization bar diverges from the second vertical axis as the second heel stabilization bar approaches the second heel.

11. The golf club head set of claim 9, wherein: the first toe stabilization bar comprises a first toe stabilization bar axis defining a first toe stabilization bar reference angle with the first vertical axis; the first heel stabilization bar comprises a first heel stabilization bar axis defining a first heel stabilization bar reference angle with the first vertical axis; the second toe stabilization bar comprises a second toe stabilization bar axis defining a second toe stabilization bar reference angle with the second vertical axis; and the second heel stabilization bar comprises a second heel stabilization bar axis defining a second heel stabilization bar reference angle with the second vertical axis.

12. The golf club head set of claim 11, wherein at least one of the first toe stabilization bar reference angle is equal to the first heel stabilization bar reference angle; or the second toe stabilization bar reference angle is equal to the second heel stabilization bar reference angle.

13. The golf club head set of claim 11, wherein: the first toe stabilization bar reference angle comprises a first angle greater than or equal to 30 degrees and less than or equal to 90 degrees; and the second toe stabilization bar reference angle comprises a second angle of greater than or equal to 30 degrees and less than or equal to the first toe stabilization bar reference angle.

14. The golf club head set of claim 9, wherein: the first toe stabilization bar comprises a first toe stabilization bar width and a first toe stabilization bar thickness; the first heel stabilization bar comprises a first heel stabilization bar width and a first heel stabilization bar thickness; the second toe stabilization bar comprises a second toe stabilization bar width and a second toe stabilization bar thickness; the second heel stabilization bar comprises a second heel stabilization bar width and a second heel stabilization bar thickness; and at least one of: the first toe stabilization bar width is equal to the first heel stabilization bar width; the first toe stabilization bar thickness is equal to the first heel stabilization bar thickness; the second toe stabilization bar width is equal to the second heel stabilization bar width; or the second toe stabilization bar thickness is equal to the second heel stabilization bar thickness.

15. The golf club head set of claim 14, wherem at least one of the first toe stabilization bar width comprises a first width greater than or equal to 1.270 millimeters and less than or equal to 10.16 millimeters, and the second toe stabilization bar width comprises a second width of greater than or equal to 1.270 millimeters and less than or equal to the first toe stabilization bar width; or the first toe stabilization bar thickness comprises a first thickness greater than or equal to 0.6080 millimeters and less than or equal to 6.350 millimeters, and the second toe stabilization bar thickness comprises a second thickness of greater than or equal to 0.6080 millimeters and less than or equal to the first toe stabilization bar thickness.

16. The golf club head set of claim 4, wherein: the first golf club head comprises one of 2-iron head, a 3-iron head, a 4-iron head, a 5-iron head, a 6-iron head, a 7-iron head, an 8-iron head, a 9-iron head, or a wedge head; the second golf club head comprises a different one of the 2-iron head, the 3-iron head, the 4-iron head, the 5-iron head, the 6-iron head, the 7-iron head, the 8- iron head, the 9-iron head, or a wedge head; when any of the first, or second head comprises the 2-iron head, the 2-iron head comprises: a 2-iron loft angle of 18 degrees to 20 degrees; and at least one of: 2-iron toe stabilization bar width of greater than or equal to 0.5 millimeters and less than or equal to 5.1 millimeters; or 2-iron heel stabilization bar width of greater than or equal to 0.5 millimeters and less than or equal to 5.1 millimeters; and at least one of 2-iron toe stabilization bar reference angle of greater than or equal to 35 degrees and less than or equal to 95 degrees; or 2-iron heel stabilization bar reference angle of greater than or equal to 40 degrees and less than or equal to 100 degrees; when any of the first, or second head comprises the 3-iron head, the 3-iron head comprises: a 3-iron loft angle of 20 degrees to 23 degrees; and at least one of: 3-iron toe stabilization bar width of greater than or equal to 0.8 millimeters and less than or equal to 5.8 millimeters; or 3-iron heel stabilization bar width of greater than or equal to 0.8 millimeters and less than or equal to 5.8 millimeters; and at least one of: 3-iron toe stabilization bar reference angle of greater than or equal to 31 degrees and less than or equal to 93 degrees; or 3-iron heel stabilization bar reference angle of greater than or equal to 36 degrees and less than or equal to 98 degrees; when any of the first, or second head comprises the 4-iron head, the 4-iron head comprises: a 4-iron loft angle of 21 degrees to 25 degrees; at least one of: 4-iron toe stabilization bar width of greater than or equal to 1.0 millimeters and less than or equal to 6.7 millimeters; or 4-iron heel stabilization bar width of greater than or equal to 1.0 millimeters and less than or equal to 6.7 millimeters; and at least one of 4-iron toe stabilization bar reference angle of greater than or equal to 27 degrees and less than or equal to 91 degrees; or 4-iron heel stabilization bar reference angle of greater than or equal to 32 degrees and less than or equal to 96 degrees; when any of the first, or second head comprises the 5-iron head, the 5-iron head comprises: a 5-iron loft angle of 23 degrees to 28 degrees; at least one of: 5-iron toe stabilization bar width of greater than or equal to 1.3 millimeters and less than or equal to 7.1 millimeters; or 5-iron heel stabilization bar width of greater than or equal to 1.3 millimeters and less than or equal to 7.1 millimeters; and at least one of 5-iron toe stabilization bar reference angle of greater than or equal to 22 degrees and less than or equal to 88 degrees; or 5-iron heel stabilization bar reference angle of greater than or equal to 28 degrees and less than or equal to 94 degrees; when any of the first, or second head comprises the 6-iron head, the 6-iron head comprises: a 6-iron loft angle of 26 degrees to 32 degrees; at least one of: 6-iron toe stabilization bar width of greater than or equal to 1.5 millimeters and less than or equal to 8.0 millimeters; or 6-iron heel stabilization bar width of greater than or equal to 1.5 millimeters and less than or equal to 8.0 millimeters; and at least one of: 6-iron toe stabilization bar reference angle of greater than or equal to 18 degrees and less than or equal to 86 degrees; or 6-iron heel stabilization bar reference angle of greater than or equal to 24 degrees and less than or equal to 92 degrees; when any of the first, or second head comprises the 7-iron head, the 7-iron head comprises: a 7-iron loft angle of 29 degrees to 36 degrees; and at least one of: 7-iron toe stabilization bar width of greater than or equal to 1.8 millimeters and less than or equal to 8.0 millimeters; or 7-iron heel stabilization bar width of greater than or equal to 1.8 millimeters and less than or equal to 8.0 millimeters; and at least one of 7-iron toe stabilization bar reference angle of greater than or equal to 14 degrees and less than or equal to 84 degrees; or 7-iron heel stabilization bar reference angle of greater than or equal to 20 degrees and less than or equal to 90 degrees; when any of the first, or second head comprises the 8-iron head, the 8-iron head comprises: a 8-iron loft angle of 34 degrees to approximately 42 degrees; and at least one of: 8-iron toe stabilization bar width of greater than or equal to 2.0 millimeters and less than or equal to 8.0 millimeters; or 8-iron heel stabilization bar width of greater than or equal to 2.0 millimeters and less than or equal to 8.0 millimeters; and at least one of 8-iron toe stabilization bar reference angle of greater than or equal to 10 degrees and less than or equal to 82 degrees; or 8-iron heel stabilization bar reference angle of greater than or equal to 16 degrees and less than or equal to 88 degrees; when any of the first, or second head comprises the 9-iron head, the 9-iron head comprises: a 9-iron loft angle of 38 degrees to 45 degrees; at least one of: 9-iron toe stabilization bar width of greater than or equal to 2.3 millimeters and less than or equal to 8.3 millimeters; or 9-iron heel stabilization bar width of greater than or equal to 2.3 millimeters and less than or equal to 8.3 millimeters; at least one of: 9-iron toe stabilization bar reference angle of greater than or equal to 6 degrees and less than or equal to 80 degrees; or 9-iron heel stabilization bar reference angle of greater than or equal to 12 degrees and less than or equal to 86 degrees; and when any of the first, or second head comprises the wedge head, the wedge head comprises: a wedge loft angle of 42 degrees to 64 degrees; and at least one of: a wedge toe stabilization bar width of greater than or equal to 2.5 millimeters and less than or equal to 8.5 millimeters; a wedge heel stabilization bar width of greater than or equal to 2.5 millimeters and less than or equal to 8.5 millimeters; a wedge toe stabilization bar reference angle of greater than or equal to 1 degree and less than or equal to 77 degrees; or a wedge heel stabilization bar reference angle of greater than or equal to 8 degrees and less than or equal to 84 degrees.

17. The golf club head set of claim 16, wherein: the first golf club head comprises the wedge head; and the second golf club head comprises one of the 2-iron head, the 3-iron head, the 4-iron head, the 5-iron head, the 6-iron head, the 7-iron head, the 8-iron head, or the 9-iron head.