JPH10263117A - Golf club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To expand a sweet area, to improve a directionality, to improve swing follow-through at various lies, and especially to facilitate striking by a club corresponding to a long iron. SOLUTION: This golf club head is dimensioned such that when a height H from the lowest position of a sole part 3 to the heighest position of a crown part 2 is set as a head height and the distance L from a leading edge 9 to a trailing edge 10 is set as a sole width, H/L is within the range of 0.8 to 2.0, and three or more projected bar parts 8 are arranged longitudinally of a face 4, the projected parts being composed of a metal material having a greater specific gravity than that of the metal material of a head body 1 and extending in the direction from the front part to the rear part of the sole part 3, and the height of the projected bar part 8 disposed in the central part of the face 4 is set higher tan the heights of the projected bar parts 8 disposed respectively at the sides of the toe 7 and the heel 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention relates to fairway woods and so-called long irons and middle irons, except for driver woods and short irons of number 8 or higher and pitching wedges (PW) and sand wedges (SW). The present invention relates to improvement of a golf club head.

[0002]

2. Description of the Related Art A golf club is roughly composed of a wood club and an iron club. Since the wood club places great emphasis on the flight distance, a long iron club, in particular, requires a flight distance comparable to fairway wood in addition to direction. However, for a general golf player, this long iron club is said to be harder to hit and harder to hit the core than other clubs, and is likely to have many missed shots. For this reason, the applicant previously described in Japanese Patent Application Laid-Open No. 61-149179,
The cause of this is to increase the sole width of the long iron club head in the club set from wood clubs to short irons, and propose a club with a head shape intermediate between the wood club and the iron club. . Also, in JP-A-7-313636, the center of gravity of the club head is lowered so that the ball easily rises at impact, and the sole portion is made more slippery to make it easier to hit the ball even in a bad lie situation, and further from the rough. As a golf club head with improved swing-through, a golf club head in which a plurality of ridges made of a metal material having a higher specific gravity than the head body is provided on a sole portion of the club head has been proposed.

[0003]

However, in the former golf club having an intermediate head shape in the conventional example, the sole width is widened and the number of missed shots is certainly reduced.
In addition, there is still dissatisfaction that the ball is difficult to lift, and in order to improve this point, if a plurality of ridges in the latter conventional example are provided on the sole surface of the former golf club, the center of gravity of the head becomes low. Although the ball will rise higher at impact, the actual golf course has various undulating terrain and the ground has large and small irregularities and deep rough, so it is stable at various lie angles at impact In many cases, golf clubs are required to be able to swing as easily as possible because the resistance of the sole surface is as small as possible, and in such a case, the conventional club exerts its function more than enough It was difficult to make an accurate and easy hit.

[0004] Therefore, the present invention provides a golf club head which enlarges the sweet area, improves the directionality, improves the swing-out at various types of lie, and particularly makes it easier to hit a club corresponding to a long iron. The purpose is to:

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention has a crown portion, a sole portion, and a face surface which is supported by the crown portion and serves as an impact surface. In the golf club head in which all or a part of the head body to which the head is connected is made of a metal material, the height H from the lowest part of the sole part to the highest part of the crown part is the head height, and from the leading edge to the trailing edge. When the distance L is the sole width, H / L is in the range of 0.8 to 2.0, and is made of a metal material having a specific gravity greater than that of the metal material of the head body and extends from the front to the rear of the sole portion. Three or more protruding portions are arranged in the length direction of the face surface, and the height of the protruding portions disposed at the central portion of the face surface is disposed on the toe side and the heel side of the face surface. Are those set higher than the height of the protrusions.

[0006]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0007] In the embodiment shown in FIG.
There is a crown portion 2, a sole portion 3, and a face surface 4 supported by these and serving as an impact surface. A hosel 6 to which a shaft (not shown) is connected is provided near the heel 5 of the face surface 4, and on the opposite side to the heel. Has a tow 7.
All or part of such a head body 1 is formed of a metal material. The sole portion 3 is provided with three ridges 8.

In the side view shown in FIG. 2, the height H from the horizontal line extending from the lowest portion of the sole portion 3 to the highest portion of the crown portion 2 is defined as the head height, and the height H from the leading edge 9 to the trailing edge 10 is determined. When the distance L is the sole width, H / L is in the range of 0.8 to 2.0. Protrusions 8 made of a metal material having a higher specific gravity than the metal material of the head body 1 and extending from the front part to the rear part of the sole part 3 are arranged in the length direction of the face surface 4. The height of the ridges 8 (central ridges 8 in FIG. 1) arranged at the center of the face 4 is equal to the height of the ridges 8 arranged on the toe 7 side and the heel 5 side of the face 4. It is set higher than that. The ratio of the head height H to the sole width L, that is, H / L, is 1.8 to 1.8 in a normal iron club.
2.5 for wood clubs and 0.6-0.2 for wood clubs.
It is in the range of 65. Especially for long irons,
The width L of the sole portion 3 is narrow, and this value is in the range of 2.0 to 2.5, which is far from the wood club. In the head shape of the present invention, this value is 0.8 to
Since it is set within the range of 2.0, the width L of the sole portion 3 is relatively wide, and the possibility of miss shots such as so-called duffling frequently occurring with conventional long irons is reduced. The wider sole width L means that the depth of the center of gravity can be made deeper, and the sweet area is expanded. Also, the weight is unevenly distributed on the toe 7 side and the heel 5 side like the iron,
The moment of inertia in the left-right direction can be easily increased. By increasing the moment of inertia in the left-right direction, the directionality of the hit ball is improved. H / L value is 0.8
When it is less than the above, the sole width L approaches the wood club, and the directionality of the hit ball is reduced. Further, when the value of H / L exceeds 2.0, the value is on the order of a long iron, and it is difficult to hit like a conventional long iron, and the anxiety of a miss shot increases.

The head main body 1 is not limited to one formed entirely of a metal material, but may be a combination of a metal material and a synthetic resin material, or a combination of different metal materials.

In this embodiment shown in FIGS. 1 and 2, the head body 1 is made of pure titanium, and the head height H
Was set to 50 mm, and the sole width L was set to 35 mm. The value of H / L was 1.43 in this example. Further, the crown portion 2 is an inclined surface that is inclined from the upper end of the face surface 4 toward the back surface of the back surface, and the height of the face surface 4 is changed so as to decrease monotonously from the toe 7 side to the heel 5 side. The overall shape was intermediate between a conventional wood club and an iron club.

In this embodiment, the ridge 8 is a bar-shaped member made of beryllium copper. The specific gravity of titanium is 4.6 and the specific gravity of beryllium copper is 8.4.
There is about twice the difference. Also, the ridge 8 located at the center
The height from the sole 3 is 3 mm, and the height of the two ridges 8 of the same shape arranged at the same distance on both sides of the center ridge 8 is 2 mm. did. The difference between the height of the ridge 8 at the center and the height of the ridge 8 on both sides is 1 to 3
The range of mm is preferred. Furthermore, the central ridge 8
Is preferably 2 to 5 mm, and the height of the ridges 8 on both sides is preferably 1 to 4 mm. If the height of the ridge 8 is too high, the impact surface becomes high, and if the height is too low, the weight of the ridge 8 becomes insufficient and the center of gravity of the head cannot be lowered.

As shown in FIGS. 3 to 5, the protrusions 8 are attached to the sole 3 by a necessary number of grooves 3A.
The side walls 3B of these grooves 3A are formed into a tapered shape extending from the inside of the sole portion 3 to the outside, and the ridges 8 are press-fitted into these grooves 3A from the inside of the sole portion 3 to the outside ( (See FIG. 4). Next, pressure is applied to the protruding portion 8 from above and below, and the protruding portion 8 is fixed to the sole portion 3 (see FIG. 5).

When the height of the central portion of the face surface 4 and the height of the ridges 8 on both sides thereof are set to 3 mm and 2 mm, respectively, the adjustable range of the lie angle can be calculated as follows. That is,
As shown in FIG. 6, the adjustable range of the lie angle is θ, d = 2
When 1 mm, tanθ = difference in ridge height / interval of ridge (d) = 1/21
θ = 2.7 ° That is, when the set lie angle of the club of the embodiment is set to 58 °, the club head is stabilized even when the terrain having a lie angle of 60.7 ° to 55.3 ° is encountered. Can be grounded. In this sense, the adjustable range of the lie angle is assumed to be 2.7 °. When the height difference between the ridges 8 is 3 mm, the adjustable range can be expanded to about 8 °.

A conventional cavity-back type iron club having a loft angle of 22.5 degrees, a wood club having a loft angle of 24 degrees and an embodiment of the present invention having a loft angle of 22.5 degrees are described below.
The depth of the center of gravity, the height of the center of gravity, and the moments of inertia in the vertical and horizontal directions around the center of gravity of the head were measured and compared. The results are as shown in Table 1.

[0015]

[Table 1]

In the embodiment of the present invention, the depth of the center of gravity is as deep as four times that of the conventional iron club, and it can be seen that the depth is intermediate between the wood club and the iron club. The height of the center of gravity on the face is lower than that of the wood club, and is the same as that of the iron club except for the height of the ridge (3 mm). The height of the center of gravity from the ground is also selected as a comparative example. It is clear that since the ball is at the same level as the cavity iron, the ball easily rises at the time of impact, and the golf club is easy to hit with few miss shots for a general golfer. Further, it can be seen that the moment of inertia in the left-right direction is as large as an iron, and the moment of inertia in the up-down direction is also larger than that of an iron, and is improved like a wood.
As a result, even when the hit ball deviates from the sweet area, variation in directionality is small, and loss of distance is reduced.

[0017]

As described above, according to the present invention, the height H from the lowest portion of the sole portion to the highest portion of the crown portion is defined as the head height, and the distance L from the leading edge to the trailing edge is determined as the sole height. H when width
/ L is in the range of 0.8 to 2.0, and three or more ridges made of a metal material having a specific gravity greater than the metal material of the head body and extending from the front to the rear of the sole portion are formed on the face surface. Since the height of the ridges arranged in the length direction and arranged at the center part of the face surface is set higher than the height of the ridges arranged on the toe side and the heel side of the face surface, The width of the sole portion is relatively wide, and the possibility of miss shots such as so-called duffling frequently occurring with conventional long irons is reduced, the depth of the center of gravity can be made deeper, and the sweet area can be expanded. Furthermore, the weight can be unevenly distributed on the toe side and the heel side to increase the moment of inertia of the face surface in the left-right direction, and as a result, the directionality of the hit ball is improved.
Furthermore, since the plurality of ridges having a large specific gravity are arranged on the sole, the center of gravity of the head is reduced, and it is easy to raise the ball even if the loft angle is small. Furthermore,
Of the three or more ridges provided, the height of the ridge disposed at the center of the face surface is set higher than the height of the ridges disposed on the toe side and the heel side of the face surface. So, even if the sole surface is round and there is a ball on various terrain and unevenness of the ground, it is possible to stably touch the sole surface to the ground with a lie angle corresponding to it and hold the club and swing out it can. Further, since the sole surface is rounded by these ridges and the contact area of the sole surface is reduced, the head can be easily swung even in a deep rough or the like. Further, when the difference between the height of the ridge arranged at the center portion of the face surface and the height of the ridge arranged on the toe side and the heel side of the face surface is 1 to 3 mm, The sole surface is stable on rough ground, and it can easily cope with complicated terrain, unevenness and deep rough on the course. If the height difference of the ridges exceeds 3 mm, the sole surface will not be stable on the flat ground of the fairway, making it difficult to hold the ridge flat at a normal lie angle, and the impact surface due to the high central ridge. Is located above, and it becomes difficult to hit the ball placed on the ground with the core of the face surface. When the height difference is less than 1 mm, the plurality of ridges are almost the same height and the sole surface is flat, so that it is difficult to take a free lie angle at the time of addressing, complicated terrain of the course and unevenness of the ground. Or they can't handle deep rough. Further, when the loft angle of the face surface is in the range of 15 to 30 degrees, it corresponds to a long iron which has been difficult to hit in the past, but it is possible to obtain the longest flight distance while maintaining the directivity. If the loft angle is less than 15 degrees, the club becomes a so-called driver and tees up to hit the club, and the effect of the ridge portion is reduced. Also,
When the loft angle exceeds 30 degrees, the importance of short iron-specific functions such as how to hit the turf by taking the turf by taking advantage of the leading edge of the club face surface and soft hitting feeling increases. The need for the features and advantages of the invention may be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing a preferred embodiment of the present invention.

FIG. 2 is a side view.

FIG. 3 is a cross-sectional view showing an example of an attaching means of a ridge portion.

FIG. 4 is a sectional view showing a step subsequent to FIG. 3;

FIG. 5 is a sectional view showing a state where a ridge is attached.

FIG. 6 is an explanatory diagram of an adjustable range of a lie angle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head main body 2 Crown part 3 Sole part 4 Face surface 5 Heel 7 Toe H Head height L Sole width

Claims (3)

[Claims] 1. A head body having a crown portion, a sole portion, and a face surface supported by these and serving as an impact surface, and a whole or a part of a head body connected to a shaft near a heel of the face surface is made of a metal material. In a golf club head, the height H from the lowest portion of the sole portion to the highest portion of the crown portion is defined as the head height, and the distance L from the leading edge to the trailing edge is defined as the sole width.
Is in the range of 0.8 to 2.0, and at least three protruding ridges made of a metal material having a specific gravity greater than the metal material of the head body and extending from the front to the rear of the sole portion have a length of the face surface. And the height of the ridges arranged at the center of the face surface is set higher than the height of the ridges arranged on the toe side and the heel side of the face surface. Golf club head 2. A difference between the height of the ridge arranged at the center of the face surface and the height of the ridges arranged on the toe side and the heel side of the face surface is 1 to 3 mm. 2. The golf club head according to 1. 3. The golf club head according to claim 1, wherein a loft angle of the face surface is in a range of 15 to 30 degrees.