JP5101739B2 - Golf club - Google Patents

Description

  The present invention relates to a golf club, and more particularly to a golf club having score lines formed on a ball striking face of a face of a golf club head.

  In general, the spin of a golf ball greatly affects the flight distance and directional stability. For this reason, various proposals for optimizing the spin amount of the golf ball have been made.

  For example, there is a golf club head that imparts roundness to the upper end of the side wall of the groove that forms the score line, and suppresses the amount of spin applied to the ball at the time of hitting, compared to the case where the upper end of the side wall is sharp (see, for example, Patent Document 1).

  In addition, a score line is provided on the hitting surface that has been flattened, and after this, no polishing process is performed, and only the process of removing the bulge along the periphery of the edge by blasting is performed, leaving the edge of the scoreline sufficiently. A method for manufacturing an iron golf club head capable of giving a sufficient back spin to a ball has been developed (see, for example, Patent Document 2).

  Furthermore, in order to reduce the backspin amount and increase the flight distance while increasing the ball launch angle, a wood type golf club has been proposed in which the depth and width of the face line groove are formed within a predetermined range (for example, (See Patent Document 3).

JP-A-2005-270517 JP 2004-141277 A JP 2006-61206 A

  However, in any of the conventional golf clubs as described above, the edge between the side wall of the groove forming the score line and the hitting surface is not rounded, and the sharper the sliding with the ball, the higher the spin rate. This is done on the premise that there is a limit to the effect. In particular, the golf rule stipulates that the groove portion of the score line is given a predetermined roundness, and the slip suppression effect is also reduced.

  The present invention has been made based on such circumstances, and can stably and reliably increase the spin amount of the ball at the time of hitting, and stabilize the flight distance and operability of the hit golf ball. An object is to provide a golf club that can be achieved.

The golf club of the present invention to achieve the above object, a curved surface formed on the surface of the edge between the ball striking face of the face of the golf club head and the side surface of the groove forming a score line on the ball striking face, this A flat portion formed in a belt shape adjacent to the ball striking surface side extension portion of the curved surface and having a concave groove side inclined toward the bottom surface side of the concave groove with respect to the central portion between the adjacent concave grooves is larger than the hitting surface. It is characterized by being formed with a roughness.

  It is preferable to form a plurality of fine protrusions extending along the score line on the surface of the edge portion.

  Moreover, it is preferable that the surface of the said edge part is formed so that surface hardness is higher than the bottom face of a ditch | groove.

A curved surface formed on the surface of the edge between the side surface of the concave groove ball striking surface of the face of the golf club head to form a score line on the ball striking face, adjacent to the ball striking face side extension portion of the curved surface, In a golf club in which a flat portion formed in a band shape in which the groove side is inclined toward the bottom surface side of the groove from the center portion between the adjacent grooves, the golf club has a roughness greater than the hitting surface. The higher the head speed, the stronger the ball comes into contact with the edge surface of the score line, and it is easier to ensure a sufficient amount of spin due to the curved surface and flat portion of the edge surface, which is rougher than the hitting surface. On the other hand, as the head speed decreases, the contact force between the curved surface of the edge surface and the flat portion decreases, and the amount of spin can be reduced and the decrease in the flight distance of the ball can be suppressed. , Flying distance Becomes easy to control the ball as well as Joka, it is possible to form the easy golf club to operate easy to hit.

Further, the surface of the edge, thus providing a plurality of fine ridges extending along the score line, or, even when the formed high surface hardness than the bottom surface of the groove surfaces of the edge, and the above Similarly, the flight distance and operability can be stabilized, and the direction stability can be further improved.

1 is a view showing a golf club head of a golf club according to a preferred embodiment of the present invention. Sectional drawing which follows the II-II line | wire of FIG. FIG. 2 is an enlarged cross-sectional view of the face member of FIG. 1. FIG. 2 is an enlarged explanatory view of a groove forming the score line of FIG. 1. Expansion explanatory drawing of the groove | channel by other embodiment. Furthermore, the expansion explanatory drawing of the groove | channel by other embodiment. Furthermore, the expansion explanatory drawing of the groove | channel by other embodiment.

  1 and 2 show a golf club 10 according to a preferred embodiment of the present invention.

  In the golf club 10 of the present embodiment, the lie angle α and the loft angle β (see FIG. 2) defined with respect to the reference horizontal plane F are set at the tip of the shaft 8 formed in a hollow structure with, for example, fiber reinforced resin or metal. The golf club head 12 is formed as an iron head club to which the golf club head 12 is fixed, and is formed as an iron club having a grip (not shown) formed of a soft or soft material such as natural rubber or synthetic rubber attached to the base end. Here, the lie angle α is a mounting angle of the shaft axis 8a with respect to a sole portion or a reference horizontal plane F to be described later, and the loft angle β is a vertical plane R in which the front surface of the face 16 to be described later is orthogonal to the reference horizontal plane F. It is an angle formed between. The golf club head 12 may be a hollow type wood type golf club in addition to a so-called iron head.

  In the golf club head 12 of the present embodiment, a face member 18 that forms a repulsive force is disposed on a face 16 whose front surface forms the ball striking surface 14 or the face surface of the golf ball B. A large number of score lines 20 extending in the toe-heel direction of shallow grooves or the like in a substantially horizontal direction are formed on the front surface of the face member 18 along a region that forms a flat surface suitable as the ball striking surface 14 of the golf ball B. Is formed by suitable means. The face member 18 is fixed in a state in which the front surface of the face member 18 and the front surface of the head main body 22 are flush with each other by a step portion 22 a formed on the front surface side of the head main body 22.

  The face member 18 has stepped portions on the back side of the outer peripheral side of the ball striking surface 14 on which the score line 20 is formed, on the top 24 side, the toe 26 side, the heel 28 side and the sole 30 side formed on the head body 22. It is preferable to abut on a support surface formed flat along 22a, and to fix the peripheral edge portion integrally to the head body 22 by welding, brazing, caulking or the like. Such a face member 18 can be formed as a rolled plate made of a high-strength metal material such as stainless steel alloy, maraging steel, titanium, or titanium alloy, for example, in order to apply a large repulsive force to the golf ball. However, in order to impart a suitable spin to the golf ball B, it can be formed of a soft material such as aluminum bronze. In either case, the ball striking surface 14 is formed of a single material.

  Note that the face member 18 is not limited to such a rolled material, and may be formed by a method such as forging or casting in which a high-strength material is integrally formed with the main body. It is also possible to use an appropriate material such as steel, geralumin, and beryllium. The score line 20 formed on the ball striking surface 14 of the face 16 has a groove shape extending in a line shape along the direction parallel to the reference horizontal plane F or the toe-heel direction connecting the toe 26 and the heel 28 as shown. A plurality of punch marks (not shown) formed in the form of small circles or dot-like depressions in a plan view as viewed from the face 16 side are provided along the toe heel direction or the top sole direction. In order to simplify the description of the concave portion having at least one form of such a groove or depression, the score line 20 formed by the groove will be described.

  The head main body 22 to which the face member 18 is fixed to the front part has a top 24, a sole 30, a toe 26, and a heel 28 protruding from the back surface of the face 16 toward the back 32 side along the periphery of the face 16. A cavity 34 whose front side is closed by the face member 18 and opens to the back 32 side is formed in a frame shape that penetrates or partitions. The heel 30 is provided with a hosel 36 for attaching the shaft 8, and the top 24 extends upward from the heel 28 toward the curved toe 26. The head main body 22 is preferably made of an iron-based alloy (for example, a stainless steel alloy such as SUS630 or SUS431, an alloy such as maraging steel, nickel or tungsten) with high specific gravity and high strength, and other metals such as a titanium alloy. In addition to this, a part or the whole of the metal having the same strength as that of the metal can be formed of a fiber reinforced resin, a fiber reinforced metal, or the like. Those formed of such fiber reinforced resin or fiber reinforced metal are also included. For example, the head body 22 can be formed by combining a plurality of materials.

  The head main body 22 according to the present embodiment has a low center of gravity structure in which the sole 30 side is larger than the top 24 and protrudes toward the back 32 side. A weight portion 36 is disposed on the sole 30 so as to be separated from the face 16 toward the back 32, and a groove-like gap 38 is formed between the weight portion 36 and the face member 18. The gap 38 is preferably formed in such a size that the face member 18 does not come into contact with the ball when the ball is hit, so that the weight adding portion 36 is brought close to the face portion 12 side and the sweet spot S position is efficiently lowered. It is possible to form the golf club head 10 suitable for hitting a golf ball placed on the ground. Reference numeral 36a denotes a weight member that is made of a material having a specific gravity greater than that of the head main body 22 such as tungsten, for example, and has a lower center of gravity and is disposed rearward.

  When a golf ball B is hit with such a golf club head 12, the ball B that hits the hitting surface 14 of the face 16 moves to the top 24 side on the face 16 while deforming in a state of being crushed by the impact, It flies away from the face 16 with a repulsive force to return to its original shape.

3 shows an enlarged vertical cross section along the top-sole direction connecting the top 24 and the sole 30 of the ball striking surface 14 formed on the face 16, and the concave grooves forming the score line 20 and the ball striking surface 14. The edge 40 formed between the golf ball B extends in the direction orthogonal to the rotation direction of the golf ball B along the toe-heel direction. At the time of hitting, these edge portions 40 come into contact with the surface of the golf ball B, and the golf ball B rotates by frictional resistance formed between the edge portions 40. Therefore, the amount of spin given to the golf ball is greatly influenced by the frictional resistance formed between the edge 40 and the cross-sectional shape of the groove. For this reason, the ditch | groove which forms the score line 20 can be formed not only in the rectangular cross-sectional shape as shown in figure but in appropriate cross-sectional shapes, such as a triangular shape expanded to the ball-hitting surface 14 side, or a semicircle shape.

As shown in FIG. 5, the depth D of the concave groove forming the score line 20, that is, the distance D between the hitting surface 14 and the bottom surface 20a is 0.5 mm or less, and a 30 degree angle with respect to the hitting surface 14 is used. The width W, which is the distance between the adhesion points C with the tangent line by the measurement method, is 0.9 mm or less, the radius R of the roundness forming the edge 40 is 0.5 mm or less, and the distance between adjacent grooves is The width W is 3 times or more and 1.9 mm or more. In the case of a punch mark (not shown) formed in the form of a small circular or dot-like depression in plan view, the area is 2.8 mm ² or less, the depth is 1.0 mm or less, the adjacent punch mark or recess The distance between the center positions of the grooves is formed to be 4.3 mm or more. In either case, the regulations according to the golf rules are satisfied.

  FIG. 4 shows the surface of the edge between the ball striking face 14 and the side surface of the concave groove forming the score line 20 further enlarged.

  The score line 20 of the present embodiment is formed by a groove having a rectangular cross section with a width dimension between the opposing side surfaces 20b of about 0.5 to 0.9 mm. Further, the edge portion 40 between the side surface 20a of the concave groove of the score line 20 and the flat hitting surface 14 is convex outwardly across the extended portion 40a on the hitting surface 14 side and the inner edge portion 40b on the side surface 20a side. It is formed with a curved surface that bulges. The curved surface has a radius R of about 0.1 mm, a distance h between the outer extending portion 40a and the adjacent side surface 20b is 0.1 mm, and a distance v between the inner edge portion 40b and the hitting surface 14 is 0.1 mm. Preferably, the surface of the edge portion 40 is formed with a roughness higher than that of the ball striking face 14.

  Specifically, fine irregularities 42 are formed on the surface of the edge portion 40 by a plurality of fine protrusions or grooves extending linearly along the score line 20. Since the fine irregularities 42 are formed to have a larger roughness than the ball striking surface 14, for example, the depth is about 0.05 mm and the interval is about 0.05 mm. The roughness in the vertical section along the direction orthogonal to the score line 20 is formed larger than the roughness in the vertical section along the current direction.

Such fine irregularities 42 may be formed in a suitable manner, for example roughing machining, placed gouges, rough, sculpture, formed after the formation of the time or groove further forms the score line 20 in stamping, etc. Alternatively, it may be formed with a mold during forging or casting. Further, after forming the concave groove of the score line 20, it may be formed by C chamfering, barrel polishing or the like. Further, if necessary, the fine irregularities 42 can be formed after spraying, painting, plating, or the like is formed on the entire hitting surface 14.

  The golf club 10 of the present embodiment formed in this way has an edge between the ball striking surface 14 of the face 16 of the golf club head 12 and the side surface 20b of the concave groove that forms the score line 20 on the ball striking surface 14. By forming the surface of 40 with a roughness greater than that of the ball striking surface 14, the ball B comes into stronger contact with the surface of the edge portion 40 of the score line 20 as the head speed with respect to the golf ball B increases. It is easier to ensure a sufficient amount of spin on the surface of the edge 42 having a larger roughness than that. On the contrary, as the head speed decreases, the contact force with the surface of the edge 40 decreases, and the amount of spin decreases. A decrease in the flying distance of the ball B can be suppressed. Thereby, the flight distance of the hit golf ball B is stabilized, the ball B can be easily controlled, and the golf club 10 that can be easily hit and operated can be formed.

  Further, the fine irregularities 42 formed on the surface of the edge portion 40 of the score line 20 are formed by a plurality of fine protrusions or grooves extending in a line extending along the score line 20, whereby the score line 20. The flying distance is stabilized by forming the roughness in the vertical section along the top-sole direction perpendicular to the score line 20 larger than the roughness in the vertical section along the toe-heel direction. In addition to the effects that are easy to operate, even if the movement of the face 16 at the time of hitting moves from the outside to the inside or from the inside to the outside, the bending of the ball in the slicing direction or the hook direction is reduced, and therefore Directional stability can be ensured.

  FIG. 5 is a vertical sectional view of a ball striking surface of a golf club according to another embodiment. Since various embodiments described below are basically the same as the above-described embodiments, the same parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, the flat part 44 is formed in the site | part adjacent to the extended part 40a of the curved surface which forms the edge 40 of the score line 20. As shown in FIG. The flat portion 44 extends along the score line 20, and the flat portion 44 is slightly inclined toward the edge 40, and is therefore more concave than the central portion between the adjacent grooves. It will be located on the bottom surface 20a side of the groove.

  The flat portion 44 is formed, for example, in a belt shape having a width dimension p of about 0.1 to 0.5 mm between the extended portion 40a, and the fine unevenness 42 similar to the above can be formed on the surface thereof. preferable. Instead of such fine irregularities 42, for example, roughening by shot peening may be performed.

  By forming such a flat portion 44 along the curved surface portion of the edge portion 40, the surface of the edge portion 40 is substantially enlarged, and a larger frictional resistance is formed, thereby forming a golf ball. It becomes possible to further increase the spin amount of B.

  In FIG. 6, a stepped portion 46 is formed on the side surface 20 b along a portion adjacent to the inner edge portion 40 b of the curved surface forming the edge portion 40. The stepped portion 46 protrudes from the inner edge portion 40b toward the side surface 20b facing the concave groove, and the tip 46a is located on the side surface 20b side from the tangent line passing through the bonding point C described above. The tip 46a of the stepped portion 46 does not need to be rounded, but it is preferable to form the fine irregularities 42 as described above on the surface thereof.

  By forming such a stepped portion 46 on the side surface 20b of the concave groove, it is preferable that the stepped portion 46 is formed so as to come into contact with the deformed golf ball B when hit. Further, such a stepped portion 46 is not limited to a concave groove having a V-shaped cross section as shown in the figure, and can be provided in a concave groove having a rectangular cross section as described above.

  FIG. 7 shows an embodiment in which a ridge line 40 c is formed between the curved surface of the edge 40 and the ball striking surface 14. The ridge line 40c does not form a transition portion that smoothly transitions the curved surface to the flat hitting surface 14 as in the above-described outer extending portion 40a, but the curved surface of the edge portion 40 and the flat surface of the hitting surface 14 A boundary portion in which the magnitude or degree of the curve changes abruptly is formed.

  Such a ridge line 40c can be formed by cutting the ball striking face 14 to a contact point C1 with a tangent line forming an angle θ smaller than 30 degrees with respect to the curved surface of the edge 40. . In this case, the radius R of the curved surface of the edge 40 is 5 mm or less.

  When the ridge line 40c is formed on the hitting surface 14 in this way, a large frictional force can be applied to the golf ball B by the ridge line 40c, and the spin amount of the golf ball can be increased.

  In the above-described embodiments, the roughness of the surface of the edge portion 40 is larger than that of the ball striking face 14, that is, the surface of the edge portion 40 is recessed. The surface hardness of the groove 20 may be higher than that of the bottom surface 20a. In this case, by maintaining the surface roughness for a long time, it is possible to stabilize the flight distance and the operability as described above, and to further improve the directional stability. Further, the flat portion 44 may have the same surface hardness as that of the edge portion 40. In this case, the frictional resistance increases and the spin amount of the ball increases.

The preferred embodiment or modification of the present invention has been described above, but the present invention is not limited to the above-described embodiment and modification, and various modifications or changes can be made. For example, the protrusions and grooves that form the fine irregularities 42 are not limited to the edge portion 40, and may be formed on part or all of the side surface 20b and the bottom surface 20a of the concave groove. Similarly, fine irregularities 42 can be formed on the ball striking surface 14 or shot peening can be performed. In this case, processing of the fine irregularities 42 is facilitated.
Hereinafter, the invention described in the scope of claims of the present application will be appended.
[1] The surface of the edge between the hitting surface of the face of the golf club head and the side surface of the concave groove forming the score line on the hitting surface is formed with a roughness greater than that of the hitting surface. To
Golf club.
[2] The surface of the edge between the ball striking face of the golf club head face and the side surface of the concave groove of the score line formed on the ball striking face is roughened in the vertical cross section along the extending direction of the score line. A golf club characterized in that the roughness in the vertical cross section along the direction perpendicular to the score line is larger than the degree.
[3] The golf club according to [1] or [2], wherein a plurality of fine protrusions extending along the score line are formed on the surface of the edge.
[4] The golf club according to any one of [1] to [3], wherein the surface of the edge portion is formed to have a higher surface hardness than the bottom surface of the groove.
[5] The surface of the edge portion is formed of a curved surface, and the hitting surface is located at a portion adjacent to the outer extension of the curved surface and closer to the bottom surface side of the groove than the central portion between the adjacent grooves. The golf club according to any one of [1] to [4], wherein the golf club has a flat portion.

  DESCRIPTION OF SYMBOLS 10 ... Golf head, 12 ... Golf club head, 14 ... Striking surface, 16 ... Face, 20 ... Score line, 40 ... Edge part.

Claims (3)

  A curved surface formed on the surface of the edge between the ball striking surface of the golf club head face and the side surface of the concave groove forming the score line on the ball striking surface, and the ball striking surface side extension portion of this curved surface, A golf club characterized in that a flat portion formed in a band shape in which the groove side is inclined toward the bottom surface side of the groove from the center portion between adjacent grooves is formed with a roughness greater than that of the hitting surface. . The golf club according to claim 1 , wherein a plurality of fine protrusions extending along the score line are formed on a surface of the edge portion. The golf club according to claim 1, wherein the surface of the edge portion is formed to have a surface hardness higher than that of the bottom surface of the groove.

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