JP2008125811A - Golf club head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent easy peeling of a resin plate and easy formation of a crack on the resin plate when providing a golf club head easily attenuating a ball-hitting sound. <P>SOLUTION: This golf club head 1 is so formed that the thickness of a ball hitting part 3 in a face part is not less than 1.0 mm and not more than 2.5 mm, at least a single resin plate 5 with a maximum value of the thickness of not less than 2.5 mm and not more than 10 mm is attached to the back face 4 of the ball hitting part 3, and the resin plate 5 is attached to the back face 4 of the ball hitting part 3 with a double-coated adhesive tape 6 with a thickness of not less than 1.0 mm and not more than 3.0 mm. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a golf club head.

  In golf club heads, it has been conventionally practiced to reduce the thickness of the face portion having a hitting ball portion (for example, about 3.0 mm or less).

  By making the face portion thin, the face portion is easily bent at the time of hitting. As a result, the coefficient of restitution is improved and the flight distance is increased.

Conventionally, for example, a resin plate is mounted on the back surface of the face portion of an iron golf club head.
Japanese Patent Laid-Open No. 9-276455 Japanese Patent No. 2,661,796 JP 2005-137634 A

  However, the golf club head as described above has the following problems.

  When the face portion is made thin, generally, the hitting sound tends to be loud and difficult to attenuate. This may adversely affect the golfer's feel. On the other hand, it is conceivable to provide attenuation means on the face portion. However, the resin plate provided on the back surface of the face portion of the conventional iron golf club head is thin and cannot sufficiently function as a damping means.

  By the way, in Japanese Patent Laid-Open No. 9-276455, a sole is formed from the lower end of the face surface that hits the ball to the back surface side, and is surrounded by ribs provided around the back surface. An iron golf club head is disclosed in which a depression is formed and a magnesium-based alloy plate-like body is provided at the bottom of the depression on the back side of the face surface.

  However, magnesium has high rigidity, so that the plate cannot follow the deflection of the face portion at the time of hitting, regardless of the thickness of the plate, and is easily peeled off by repeated hitting.

  Also, in Japanese Patent No. 266196, a strike face located on the front surface, a sole extending from the bottom of the face to the rear side, a back surface located on the opposite side of the face, and at least the back surface are installed. Vibration damping means comprising a hard plate coupled to the back surface via an elastic plate, the hard plate having a Young's modulus greater than 10000 MPa and a thickness of 0.5 mm to 2.0 mm, As a means, a golf club head is disclosed in which a peripheral portion thereof is provided in an unconstrained state.

  However, this vibration damping means performs vibration damping by the cooperation of the viscoelastic plate and the hard plate, and is not intended to attenuate the hitting sound by the resin plate.

  In Japanese Patent Laid-Open No. 2005-137634, a relatively thick resin plate is used in order to enhance the damping effect of the hitting sound. Further, the rigidity of the thick resin plate is lowered, and a groove is formed on the back surface of the resin plate so as to follow the flexure of the face during repeated hitting.

  Although the peeling of the resin plate was reduced by the groove, the surface of the resin plate corresponding to the groove part may be cracked or the decorative plating on the surface of the resin plate may be cracked by repeated hitting. .

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a golf club head in which the hitting sound is easily attenuated. It is to make it difficult to produce.

  The invention according to claim 1 is a golf club head in which the thickness of the hit ball portion in the face portion is 1.0 mm or more and 2.5 mm or less, and the maximum thickness value is 2.5 mm or more and 10 mm or less on the back surface of the hit ball portion. A golf club head having at least one resin plate attached thereto, wherein the resin plate is attached to a back surface of the hit ball portion with a double-sided tape having a thickness of 1.0 mm to 3.0 mm.

  Since the present invention is configured as described above, it is possible to provide a golf club head in which the hitting sound is easily attenuated, and the resin plate attached to the rear surface of the hitting part is peeled off, and cracks / cracks are hardly generated.

  A second aspect of the present invention is the golf club head according to the first aspect, wherein the double-sided tape is formed by overlapping a plurality of tapes.

  By adjusting the number of double-sided tapes that overlap each other, it is possible to always attach an iron golf club head having a manufacturing error and a resin plate in an optimal state.

  A third aspect of the present invention is the golf club head according to the first or second aspect, wherein the resin plate is attached to the back surface of the hit ball portion with a double-sided tape and an adhesive.

  Since the resin plate is attached by adding not only the double-sided tape but also an adhesive, the resin plate is more difficult to peel off from the rear surface of the hit ball portion.

  According to a fourth aspect of the present invention, the planar shape of the double-sided tape is 3.0 mm to 5.0 mm smaller than the planar shape formed by the periphery of the resin plate. The golf club head according to Item.

  If the size (planar shape) of the double-sided tape is 3.0 mm or more smaller than the size (planar shape) formed by the periphery of the resin plate, the thickness of the double-sided tape is 1.0 mm or more and 3.0 mm or less. Despite being relatively thick, the double-sided tape cannot be seen through the gap between the rear surface of the hit ball portion and the resin plate, and the appearance is improved. The reason why the planar shape of the double-sided tape is not reduced by 5.0 mm or more is to prevent a decrease in adhesive force.

  A fifth aspect of the present invention is the golf club head according to the fourth aspect, wherein a recess is provided on the back surface of the resin plate, and the depth of the recess is 90% or less of the thickness of the double-sided tape.

  In this case, the double-sided tape is almost hidden in the concave portion of the resin plate, and the double-sided tape becomes almost invisible from the gap between the rear surface of the hit ball portion and the resin plate, and the appearance is further improved.

  The golf club according to any one of claims 1 to 5, wherein a convex portion is provided on the back surface of the resin plate, and the convex portion is fitted into a concave portion on the rear surface of the hit ball portion. Head.

  If comprised in this way, the convex part of a resin plate back surface will fit in the recessed part of a ball hitting part back surface, and it will become easy to position the resin plate on a ball hitting part back surface.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to provide the golf club head in which a hitting sound is easy to attenuate, the resin plate attached to the back surface of a hitting part peels off, and it can make it hard to produce the crack and crack which arise in a resin plate.

  Embodiments of a golf club head according to the present invention will be described below.

  FIG. 1 is an example in which the present invention is applied to an iron golf club head, and is a view seen from the back side of a hitting portion of the iron golf club head. 2 is a cross-sectional view taken along line AA in FIG.

  In the present embodiment, the thickness of the hit ball portion 3 in the face portion of the iron golf club head 1 is 1.0 mm or more and 2.5 mm or less (more preferably, 1.5 mm or more and 2.4 mm or less, more preferably 1.8 mm). The golf club head has a thickness of 2.5 mm or more and 10 mm or less (more preferably, 2.5 mm or more and 5.0 mm or less). In the golf club head in which at least one resin plate 5 having a thickness of 3.0 mm or more and 4.0 mm or less is preferably attached, the resin plate 5 is provided on the back surface 4 of the hit ball portion 3 with a thickness of 1.0 mm or more and 3. Double-sided tape of 0 mm or less (more preferably, about 1.0 mm to 2.5 mm, more preferably about 1.1 mm to 2.0 mm) In are installed.

  In order to increase the deflection of the face part at the time of hitting and increase the resilience characteristics, the face part should be thin, and in order to ensure durability against repeated load at the time of hitting, the face part should be thick. . By setting the thickness of the face portion within the above range, both of these requirements can be satisfied. The thickness of the face portion is changed within the above range according to the material used for the face portion.

  In addition, although the example of the iron golf club head was shown in drawing, this may be a wood golf club head. The iron golf club head typically has the cavity 7 on the back surface side of the face portion, but may be other than this.

  By the way, a loud hitting sound generated at the time of hitting may adversely affect a golfer's hitting feeling. In general, as the thickness of the face portion is reduced, the amplitude of the face portion at the time of hitting is increased, so that the hitting sound is increased and the vibration continues for a long time.

  On the other hand, in the golf club head according to the present embodiment, a resin plate is attached to the back surface of the hit ball portion in the face portion. The resin plate makes it easy to attenuate the vibration of the face portion generated at the time of hitting. Specifically, by attaching the resin plate, it is possible to increase the loss factor of the vibration that generates the hitting sound. Therefore, the time for attenuating the hitting sound is shortened and the hitting feeling is improved.

  In the present invention, since the resin plate 5 is attached to the back surface 4 of the hitting ball portion 3 with the double-sided tape 6 having a thickness of 1.0 mm or more and 3.0 mm or less, not only the hitting sound is easily attenuated but also the hitting ball portion. The resin plate 5 attached to the back surface is peeled off, and cracks and cracks generated in the resin plate 5 are less likely to occur.

  Here, the present inventors conducted a durability test in which hitting balls were repeated 3000 times.

In the test of Table 1, in the range of 0.4 mm to 2.0 mm, two double-sided tape materials having the same thickness were prepared and tested. In addition, the sound at the time of trial hitting is evaluated by ◯ Δ × whether or not the golfer feels that the hitting sound can be heard.
From this test result, it was concluded that the double-sided tape 6 having a thickness of 1.0 mm to 3.0 mm is preferable.

  Two or more double-sided tapes 6 may be stacked. By adjusting the number of the double-sided tapes 6 that overlap each other, it is possible to always attach the iron golf club head 1 having a manufacturing error and the resin plate 5 in an optimal state. Moreover, the cost of the double-sided tape 6 can also be suppressed by using the existing double-sided tape in an overlapping manner without specially producing a thick double-sided tape.

  By attaching the resin plate 5 to the back surface 3 of the hit ball portion 2 using an adhesive in addition to the double-sided tape 6, the resin plate 5 can be further prevented from peeling off.

FIG. 3 is a view of the resin plate 5 as viewed from the side (back surface) where the double-sided tape 6 is attached to the back surface 3 of the hit ball portion 2.
In the embodiment of FIG. 3, the planar shape of the double-sided tape 6 is 3.0 mm to 5.0 mm smaller than the planar shape formed by the peripheral edge 51 of the resin plate 5. Therefore, even though the double-sided tape 5 having a thickness of 1.0 mm to 3.0 mm is used, the double-sided tape 6 is difficult to see from the gap between the back surface 3 of the hit ball portion 2 and the resin plate 5. Appearance looks better.

FIG. 4 is a cross-sectional view of the iron golf club head 1 at the same position as FIG. 2, and is the same as FIG. 2 except that the shape of the resin plate 5 is different.
The back surface of the resin plate 5 in this embodiment is a recess 52. The depth of the recess 52 is 90% or less of the thickness of the double-sided tape 6.

In this case, the double-sided tape 6 is almost hidden in the recess 52 of the resin plate 5, and the double-sided tape 6 is hardly visible from the gap between the back surface 3 of the hit ball portion 2 and the resin plate 5, so that the appearance is further improved.
If the depth of the concave portion 52 of the resin plate 5 exceeds 90% of the thickness of the double-sided tape 6, it is not preferable because the resin plate 6 and the back surface 3 of the hitting ball portion 2 are not reliably attached.

FIG. 5 is a view of the resin plate 5 as seen from the back side, and shows an embodiment different from FIG.
In FIG. 5, a convex portion 53 is provided on the back surface of the resin plate 5. The back surface 3 of the hitting ball portion 2 is provided with a concave portion (not shown) at a position corresponding to the convex portion 53. And the convex part 53 of the resin plate 5 fits into the back surface 3 of the hitting ball part 2 to facilitate positioning of the resin plate 5 in the cavity 7 of the iron golf club head 1.
The double-sided tape 6 is provided with a hole 61 at a position corresponding to the convex portion 53 of the resin plate 5.

It is an example which implemented this invention to the iron golf club head. It is the sectional view on the AA line of FIG. It is the figure which looked at the resin plate from the back surface. It is another Example of the sectional view on the AA line of FIG. It is the other Example of the figure which looked at the resin plate from the back surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Iron golf club head 2 Hitting part 3 Back surface 5 Resin plate 51 Edge 52 Concave part 53 Convex part 6 Double-sided tape 61 Hole 7 Cavity

Claims (6)

A golf club head having a hitting ball portion thickness in the face portion of 1.0 mm to 2.5 mm,
In the golf club head in which at least one resin plate having a maximum thickness of 2.5 mm or more and 10 mm or less is attached to the back surface of the hitting ball portion,
A golf club head in which the resin plate is attached to a back surface of the hitting ball portion with a double-sided tape having a thickness of 1.0 mm to 3.0 mm.   The golf club head according to claim 1, wherein a plurality of the double-sided tapes are stacked.   The golf club head according to claim 1, wherein the resin plate is attached to a back surface of the hitting ball portion with a double-sided tape and an adhesive.   4. The golf club head according to claim 1, wherein a planar shape of the double-sided tape is 3.0 mm to 5.0 mm smaller than a planar shape formed by a peripheral edge of the resin plate. 5. .   The golf club head according to claim 4, wherein a recess is provided on the back surface of the resin plate, and the depth of the recess is 90% or less of the thickness of the double-sided tape.   6. The golf club head according to claim 1, wherein a convex portion is provided on the rear surface of the resin plate, and the convex portion is fitted into a concave portion on the rear surface of the hit ball portion.

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