JP2012125291A - Golf club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club head capable of reducing the degree of decline of a distance even when a hitting point is shifted to the vicinity of a toe side lower part or the vicinity of a heel side upper part.SOLUTION: The golf club head 1 is a wood type golf club head with a hollow shell structure including a face part 2, a sole part 3, a back part 4, a crown part 5, a toe side part 6, a heel side part 7 and a hosel part 8. A groove 10 is provided from the rear lower part of the toe side part 6 through the back part 4 to the rear upper part of the heel side part 7, and a weight body 11 is mounted on the groove 10. In order to fix the weight body 11, oblong holes 11a are provided on both ends in the longitudinal direction of the weight body 11, and a bolt 12 is inserted to the oblong hole 11a and screwed to a female screw hole 13 provided on a back surface part of the groove 10.

Description

  The present invention relates to a hollow golf club head having a wood shape or a shape similar thereto, and more particularly to a golf club head in consideration of the distribution of hit points of golfers.

  As a wood type golf club head such as a driver or a fairway wood, a metal member having a hollow shell structure is widely used. In general, a hollow wood-type golf club head includes a face portion for hitting a ball, a crown portion constituting an upper surface portion of the golf club head, a sole portion constituting a bottom surface portion of the golf club head, and a golf club. It has a side part constituting the side part on the toe side and heel side of the head, a back part constituting the back part, and a hosel part for mounting the shaft. A shaft is inserted into the hosel part and fixed with an adhesive or the like. Recently, many golf clubs called utility clubs are also commercially available, and one type of utility golf club is similar to the wood-type golf club head (that is, face portion, sole portion, side portion, Various golf clubs having a head (having a back portion, a crown portion, and a hosel portion) are also commercially available.

  As a metal constituting the hollow golf club head, an aluminum alloy, stainless steel, or titanium alloy is used, but in recent years, a titanium alloy is particularly widely used (for example, Japanese Patent Application Laid-Open No. 2003-88601).

  Generally, the sweet spot can be enlarged by increasing the volume of the hollow golf club head. Increasing the volume tends to increase the weight of the golf club head accordingly. In order to prevent this increase in weight, the thickness of the shell portion of the golf club head is reduced.

  Japanese Patent Application Laid-Open No. 2007-97647 describes that the thickness of the toe side upper portion and the heel side upper portion of the face portion is increased in consideration of the hitting point distribution of a general golfer.

JP 2003-88601 A JP 2007-97647 A

  The golfer's hit points (the position of the face surface on which the ball hits when shot) may be distributed not only at the center of the face surface but also near the lower side of the toe side and the upper side of the heel side.

  An object of the present invention is to provide a golf club head capable of reducing the degree of decrease in the flight distance even when the hit point is shifted near the toe side lower part or the heel side upper part.

  A golf club head of the present invention (Claim 1) is a golf club head having a hollow shell structure, and has a face portion, a sole portion, a crown portion, a back portion, a toe side portion, and a heel side portion. The club head is characterized in that a weight body extending from a lower portion on the toe side to an upper portion on the heel side is provided at least on the back portion.

  A golf club head according to a second aspect is the golf club head according to the first aspect, wherein the weight body extends from the toe side portion to the heel side portion.

  According to a third aspect of the present invention, the golf club head according to the first or second aspect is characterized in that the weight body is disposed in a groove provided in the golf club head.

  According to a fourth aspect of the present invention, in the golf club head according to any one of the first to third aspects, the weight body is detachable.

  According to a fifth aspect of the present invention, the golf club head according to any one of the first to third aspects is characterized in that the weight body is cast around the golf club head.

  A golf club head according to a sixth aspect is characterized in that, in any one of the first to fifth aspects, the weight body is bendable.

  In the golf club head of the present invention, since the weight member extending from the lower part on the toe side to the upper part on the heel side is provided at least on the back part, the hit point is on the lower part on the toe side of the face surface or on the heel side. Even in the upper portion, the moment of inertia is greater than that of a golf club head without such a weight, and the degree of decrease in flight distance is reduced. Further, by providing this weight body, an effect of modifying the hitting sound when the ball is hit can be expected.

  When the weight body is disposed in the groove, it is prevented from falling off the golf club head due to an external force.

  When the weight body is detachable, the weight body can be changed to one having a different weight or the like.

  When the weight is made bendable, the weight can be easily attached so as to be in close contact with the outer surface of the golf club head.

FIG. 1A is a perspective view of a golf club head according to an embodiment, and FIG. 2B is a cross-sectional view taken along line Ib-Ib in FIG. FIG. 2A is a sectional perspective view taken along line IIa-IIa in FIG. 1, and FIG. 2B is a sectional perspective view taken along line IIb-IIb in FIG. It is a perspective view from the sole part side of the golf club head of FIG. FIG. 2 is a rear view of the golf club head of FIG. 1. It is sectional drawing which follows the VV line of FIG. FIG. 5 is a partial cross-sectional view of a golf club head according to another embodiment. It is a rear view of the golf club head concerning another embodiment.

  The golf club head 1 according to the first embodiment will be described below with reference to FIGS.

  This golf club head 1 is a wood-type golf club having a hollow shell structure having a face part 2, a sole part 3, a back part 4, a crown part 5, a toe side part 6, a heel side part 7 and a hosel part 8. A head (driver in this embodiment).

  The face portion 2 is a surface that hits the ball, and is provided with a groove (score line) (not shown). The sole portion 3 constitutes the bottom surface portion of the golf club head, and the crown portion 5 constitutes the top surface portion of the golf club head.

  The back part 4 constitutes the back part of the golf club head. The toe side portion 6 and the heel side portion 7 connect the back portion 4 and the face portion 2 respectively. Further, the back part 4, the toe side part 6 and the heel side part 7 connect the sole part 3 and the crown part 5. A groove 10 is provided from the lower rear portion of the toe side portion 6 through the back portion 4 to the rear portion and the upper portion of the heel side portion 7, and a weight body 11 is attached to the groove 10. The groove 10 extends obliquely so as to be higher toward the heel side.

  As shown in FIG. 3, the shaft 20 is inserted into the hosel portion 8, and the shaft 20 is fixed by an adhesive. A ferrule 21 is attached to the upper end of the hosel part.

  In this embodiment, the boundary between the toe side portion 6 and the back portion 4 and the boundary between the heel side portion 7 and the back portion 4 are 45 tangent to the flying ball direction in plan view, respectively. Defined as the point at which

  In this embodiment, the golf club head 1 is made of metal (in this embodiment, titanium or titanium alloy) except for the weight body 11, but at least a part of the crown portion 5 is CFRP ( Carbon fiber reinforced synthetic resin). As the weight 11, one having a specific gravity of 8 or more, particularly about 10 to 16 is suitable, and specifically, copper, lead, tungsten, and alloys thereof are exemplified. Further, the weight 11 may be a synthetic resin (for example, an elastomer such as nylon, polyester resin, urethane thermoplastic elastomer, or the like) containing high specific gravity metal powder having a specific gravity of about 8 to 15 such as copper or tungsten. Good.

  The weight body 11 is preferably bendable so as to follow a curve on the back surface of the golf club head 1. Copper and lead are flexible. These copper and lead surfaces may be thinly covered with a resin.

  In this embodiment, two weights 11 having a length that is approximately half the total length of the groove 10 are used, but a single body having the same length as the total length of the groove 10 may be used. Three or more shorter ones may be used.

  In order to fix the weight body 11, long holes 11a are provided at both ends in the longitudinal direction of the weight body 11, and bolts 12 are passed through the long holes 11a as shown in FIG. The female screw hole 13 is screwed. The long hole 11 a extends in the longitudinal direction of the weight body 11. The long hole 11a is used to absorb an error in the length dimension of the weight body 11. Convex portions 11 b are provided on the outer surface side other than both ends of the weight body 11, and when the weight body 11 is mounted in the groove 10, the convex portion 11 b projects from the outer surface of the head 1. However, the weight body 11 may be flush with the outer surface of the head 1 or may be retracted into the groove 10.

  In this embodiment, the groove 10 extends from the rear and lower part of the toe side part 6 to the rear and upper part of the heel side part 7. The horizontal distance from the end (one end) on the toe side portion 6 side of the groove 10 to the face surface is preferably about 50 to 80 mm, particularly about 60 to 70 mm. The height difference between the one end of the groove 10 and the bottom of the sole portion 3 is preferably about 5 to 10 mm. The horizontal distance from the end (other end) on the heel side portion 7 side of the groove 10 to the face surface is preferably 45 to 75 mm, particularly about 50 to 70 mm. Further, the height difference between the other end of the groove 10 and the topmost portion of the crown portion 5 is preferably 15 to 50 mm, particularly about 20 to 40 mm. In this embodiment, the end of the heel side portion of the groove 10 is located on the heel side portion 7, but may be located on the crown portion 5.

  The width of the weight body 11 is preferably 5 to 12 mm, particularly about 6 to 10 mm, and the depth is preferably about 1 to 2 mm. In the rear view, the oblique inclination angle of the weight body 11 is preferably about 5 to 40 °, particularly about 10 to 35 ° with respect to the horizontal plane.

  In the golf club head 1 configured as described above, a weight body 11 having a high specific gravity is disposed from the rear and lower part of the toe side part 6 to the rear part and upper part of the heel side part 7 through the back part 4. Therefore, even when the hit point is the toe side lower portion (region 2a in FIG. 1 (a)) or the heel side upper portion (region 2b in FIG. 1 (a)) of the face portion 2, such weight body As compared with a golf club head without 11, the moment of inertia is increased and the degree of decrease in flight distance is reduced.

  In order to further enhance this effect, the lower side region 2a on the toe side of the face portion 2 and the upper side region 2b on the heel side (see FIG. 1 (a)) are made more than other portions of the face portion 2. It may be thin to increase resilience.

  In this embodiment, since the weight body 11 is disposed in the groove 10, the weight body 11 is firmly attached. Since the weight body 11 is bolted and detachable, it can be easily replaced with a weight body having a different specific gravity, width, or thickness.

  In addition, it is also possible to modify the hitting sound by providing the weight body 11 as described above.

  In this embodiment, the weight body 11 is provided on the outer surface side of the golf club head. However, like the weight body 11A in FIG. 6, the weight body 11A is made of metal and the difference in melting temperature is used to cast the weight body 11A. You may make it provide integrally by a stagnation. Part of the weight body 11A protrudes from the outer surface of the head.

  The weight body may be attached to the inner surface of the head. When a golf club head is manufactured by, for example, molding a sole portion and a crown portion separately from a face portion and joining them by welding or the like, a weight body is attached before joining such as welding. You may make it leave.

  In the present invention, the weight body 11B may extend from the sole portion 3 to the crown portion 5 as in the golf club head 1A of FIG. Although not shown in the drawings, in the golf club head of FIGS. 1 to 6, one end side of the weight body 11 may be extended to the crown portion as shown in FIG. It may be extended to the sole portion 3 as shown in FIG.

  Of the weight body, it is preferable that the portion disposed on the sole portion 3 or the crown portion 5 as shown in FIG. 7 does not protrude from the sole surface or the crown surface. In the back portion, the weight body may protrude from the outer surface of the back portion, may be flush, or may be retracted.

  The extension length of the weight body in the sole portion 3 is preferably 80 mm or less, particularly preferably 70 mm or less. The extension length of the weight body in the crown portion 5 is preferably 80 mm or less, particularly preferably 70 mm or less.

  In the bottom view of the golf club head, it is preferable that the weight body of the sole portion 3 extends obliquely so that the tip side becomes the face side and the toe side. The angle of intersection between the obliquely extending direction and the flying ball direction is preferably about 10 to 40 °, particularly about 15 to 30 °.

  In the plan view of the golf club head, it is preferable that the weight body of the crown portion 5 extends obliquely so that the tip side becomes the face surface side and the heel side. The angle of intersection between the obliquely extending direction and the flying ball direction is preferably about 10 to 40 °, particularly about 15 to 30 °.

  In FIG. 7, the weight body is exposed on the outer surface of the golf club head, but the weight body may be provided on the inner surface of the golf club head.

  The present invention is applicable not only to a wood type golf club head but also to a utility type golf club head.

DESCRIPTION OF SYMBOLS 1,1A Golf club head 2 Face part 3 Sole part 4 Back part 5 Crown part 6 Toe side part 7 Heel side part 8 Hosel part 10 Groove 11, 11A, 11B Weight body 12 Bolt 20 Shaft 21 Ferrule

Claims (6)

A golf club head having a hollow shell structure having a face portion, a sole portion, a crown portion, a back portion, a toe side portion and a heel side portion,
A golf club head characterized in that a weight body extending from a lower part on the toe side to an upper part on the heel side is provided at least on the back part.   2. The golf club head according to claim 1, wherein the weight body extends from the toe side portion to the heel side portion.   3. The golf club head according to claim 1, wherein the weight body is disposed in a groove provided in the golf club head.   4. The golf club head according to claim 1, wherein the weight body is detachable.   4. The golf club head according to claim 1, wherein the weight body is cast in a golf club head.   6. The golf club head according to claim 1, wherein the weight body is bendable.

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