JP4276755B2 - Golf club - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a golf club .
[0002]
[Prior art]
In a conventional golf club, a shaft end having a center hole in the longitudinal direction is inserted into a shaft fixing hole provided in the head main body, and the shaft fixing hole and the outer peripheral surface of the shaft front end portion are bonded to each other to fix the shaft to the head main body. I wear it.
[0003]
Further, in Japanese Utility Model Laid-Open No. 50-129266, by providing a tubular reinforcing material between the outer peripheral surface of the shaft and the shaft fixing hole at the joint between the head main body and the shaft, and providing a rod-shaped reinforcing material in the shaft center hole, A golf club with a reinforced joint is disclosed.
[0004]
[Problems to be solved by the invention]
However, the tubular reinforcing member and the rod-shaped reinforcing member of the golf club disclosed in the above publication are provided from the entire region where the shaft is fixed to the head body, that is, from the sole side of the shaft fixing hole to the hosel tip position. Yes. Accordingly, the shaft is suddenly reinforced at the lower end with the upper end of the hosel as a boundary, and there is a disadvantage that stress concentrates on the boundary portion and is easily damaged.
[0005]
The present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide a golf club that does not cause stress concentration in the fixing region of the shaft to the head body.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, a golf club of the present invention is provided with an interposed member between a shaft fastening hole formed in a pipe shape extending from the top portion to the sole portion of a hollow head body and the shaft. a golf club inserting the core to the tip side of the central hole, the intermediate member and the core is composed of a softer than the material constituting the head body material, while the other of said core member and said intermediate member Further, an annular gap is formed above the shaft longitudinal direction and between the upper end side of the shaft fixing hole and the shaft.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 to FIG. 3 are views showing a first embodiment of a golf club and a shaft fastening member according to the present invention. FIG. 1 (a) is a perspective view of the golf club, and FIG. FIG. 2 is a cross-sectional view showing the structure of the head main body, the shaft and the shaft fixing member, and FIG. 3 is a cross-sectional view showing a state where the shaft is fixed to the head main body. It is.
[0010]
In the golf club of this embodiment, the head body is configured as a hollow wood type. In this case, the head main body 1 has a top portion 1a, a sole portion 1b, a toe portion 1c, a back portion 1d, a heel portion 1e, and a face portion 1f, and a hollow shape is formed by welding these outer shell members. Is formed. Specifically, each outer shell member is formed of a metal material such as titanium, a titanium alloy, and stainless steel independently by casting, pressing, forging, or the like, and any members are integrally formed. The head main body 1 is formed by being welded to each other.
[0011]
The head body 1 is provided with a shaft fastening hole 2 formed in a pipe shape so as to penetrate from the top portion 1a to the sole portion 1b, and a shaft fastening member described later is provided in this portion. The shaft 5 is fastened through. The shaft 5 is made of metal or fiber reinforced resin and has a center hole 5a.
[0012]
A shaft fastening member 10 is disposed in the shaft fastening hole 2, and the shaft 5 is fastened to the head body 1 via the shaft fastening member 10. The shaft fixing member 10 is integrally formed of a material softer than the material constituting the head body 1, for example, metal (aluminum alloy or the like), synthetic resin, fiber reinforced resin, rubber, or the like.
[0013]
The shaft fastening member 10 is fitted in the shaft fastening hole 2 and is interposed between the shaft 5 and the interposed member (tubular portion) 10a, and extends in the axial direction inside the interposed member 10a. 5 is provided with a core material (core portion) 10b into which the front end side of the center hole 5a is fitted. These interposition members 10a and the core material 10b are integrated via a base portion 10c. The base 10c is formed with a large-diameter portion 10d that gradually increases in diameter as it goes downward.
[0014]
One of the interposition member 10a and the core member 10b is high, that is, one of them is formed to extend upward in the longitudinal direction of the shaft. In this embodiment, the interposition member 10a is formed so as to be higher than the core member 10b, and the height is shown in FIG. 3 when the shaft fastening member 10 is fitted into the shaft fastening hole 2. As shown, it is formed low so as not to coincide with the upper end of the shaft fastening hole 2. As a result, since the interposition member 10a does not exist on the upper end side of the shaft fixing hole 2, an annular gap S is defined. Moreover, it is preferable to form a taper 10e that gradually decreases in diameter as it goes upward at the upper end of the interposition member 10a.
[0015]
When actually fixing the shaft 5 to the head body 1 using the shaft fixing member 10 as described above, first, the shaft fixing member 10 is inserted into the shaft fixing hole 2 from the sole portion 1b side, In a state where the large diameter portion (stopper portion) 10d is in contact with the surface of the sole portion 1b, the shaft fastening member 10 is adhered and fixed to the shaft fastening hole 2 by attaching an adhesive to the outside of the interposed member 10a. Next, the shaft 5 is inserted into the shaft fastening hole 2 from the top portion 1a, and the shaft 5 is bonded and fixed to the shaft fastening member 10 in a state where the core member 10b is fitted in the center hole 5a. Therefore, the tip of the shaft 5 is bonded and fixed to the inside of the interposition member 10a of the shaft fixing member 10 and the core member 10b. FIG. 3 shows a state in which the above-described bonding process has been completed. In this state, the protruding portion (base portion 10c) of the shaft fixing member 10 and the lower end portion of the shaft 5 so that the sole portion 1b is flush with each other. And a golf club as shown in FIG. 1 is formed. In addition, although not shown, the adhesive may be accumulated and solidified above the upper end of the interposition member 10a of the shaft fixing hole 2 or above the upper end of the core member 10b in the shaft center hole 5a.
[0016]
Thus, according to the golf club which fixed the shaft 5, the following effects are acquired. Since the upper end position of the interposition member 10a of the shaft fixing member 10 and the upper end position of the core member 10b are different, stress concentration in the shaft fixing region is prevented and the shaft is damaged when the shaft 5 is broken during hitting or the like. This can be effectively suppressed. At this time, the core material 10b prevents the shaft 5 from being deformed so as to be crushed and suppresses the shaft from being damaged. In particular, since the taper 10e is formed at the upper end of the interposed member 10a, stress concentration can be more effectively suppressed. Further, in the present embodiment, the upper end position of the interposition member 10a is set lower than the upper end position of the shaft fixing hole 2 so that the gap S is generated, so that the effective length of the shaft is increased. When hitting a ball, the head easily returns in the vertical direction, and the ball can be launched high. If a hole communicating with the gap inside the interposition member 10a of the shaft fixing member 10 is provided on the base 10c side, air can be easily removed when the shaft 5 is bonded, and the shaft 5 can be easily inserted into the interposition member 10a.
[0017]
FIG. 4 is a view showing a golf club according to a reference example , FIG. 4 (a) is a perspective view of the golf club, and FIG. 4 (b) is a cross-sectional view of a shaft fixing portion.
[0018]
In this reference example , the interposition member 10a of the shaft fixing member 10 extends further upward than the interposition member of the above-described embodiment, and the upper end position thereof is from the upper end position of the shaft fixing hole 2, that is, the top portion 1a. It is in a protruding state. Thus, by making the interposition member 10a longer, it becomes possible to adjust the bending of the shaft 5 to a state in which the bending is suppressed to some extent. Also in such a configuration, similarly to the above-described golf club , when the shaft 5 is bent, stress concentration in the shaft fastening region is prevented, and damage to the shaft can be effectively suppressed.
[0019]
FIG. 5 shows a second embodiment of a golf club according to the present invention, and is a cross-sectional view of a shaft fastening portion.
[0020]
The shaft fastening member 10 of this embodiment is configured in the same manner as in the first embodiment with respect to the length relationship between the interposition member 10a and the core member 10b, but the base portion 10c has a length in the longitudinal direction. The front end edge of the shaft 5 which is lengthened and fixed is formed so as to be positioned above the sole portion 1b. That is, the shaft fastening member 10 is formed such that the annular groove formed between the interposition member 10a and the core member 10b is shallower than the structure shown in FIG.
[0021]
In this embodiment, the same effect as the first embodiment can be obtained, and the weight balance can be reduced by variously changing the lower end position of the shaft 5 and the thickness of the base portion 10c of the shaft fastening member 10 in this way. Adjustments can be made.
[0022]
FIG. 6 shows a third embodiment of a golf club according to the present invention, and is a cross-sectional view of a shaft fastening portion.
[0023]
The shaft fixing member 10 of this embodiment is formed so that the core member 10b extends upward in the longitudinal direction of the shaft relative to the interposed member 10a, and the upper end position of the interposed member 10a is within the head main body and the core member. It is formed so that the upper end position of 10b is above the top portion 1a.
[0024]
Even in such a configuration, as in the above-described embodiment, when the shaft 5 is bent, stress concentration in the shaft fixing region is prevented, and breakage of the shaft can be effectively suppressed. Further, since the core member 10b is lengthened, alignment when inserting the shaft 5 can be easily performed, and the bending of the shaft tip region can be somewhat suppressed as compared with the first embodiment. It becomes.
[0025]
As described above, in the shaft fixing member 10, it is sufficient that either one of the interposition member 10a or the core material 10b extends above the other in the longitudinal direction of the shaft. Various modifications are possible. Further, the present invention can be applied to an iron type golf club in addition to a wood type.
[0026]
【The invention's effect】
According to the golf club of the present invention, in the fastening region for the head of the shaft, and prevented from being deformed so as stress concentration and collapses, it is possible to effectively suppress the breakage of the shaft, further, a shaft fastening By forming an annular gap between the upper end of the hole and the shaft, the shaft becomes effective and lengthened. As a result, the head easily returns in the vertical direction at the time of hitting, and the ball is shot high Is possible .
[Brief description of the drawings]
1A and 1B are views showing a golf club according to a first embodiment of the present invention, in which FIG. 1A is a perspective view, and FIG. 1B is a cross-sectional view of a shaft fixing portion.
2 is a cross-sectional view showing the structure of a head main body, a shaft, and a shaft fastening member in the golf club shown in FIG.
FIG. 3 is a cross-sectional view showing a state where a shaft is fixed to a head body.
4A and 4B are views showing a golf club according to a reference example, in which FIG. 4A is a perspective view, and FIG. 4B is a cross-sectional view of a shaft fastening portion.
FIG. 5 shows a second embodiment of a golf club according to the present invention, and is a cross-sectional view of a shaft fastening portion.
FIG. 6 shows a third embodiment of a golf club according to the present invention, and is a cross-sectional view of a shaft fastening portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Head main body 1a Top part 1b Sole part 2 Shaft fastening hole 5 Shaft 5a Shaft center hole 10 Shaft fastening member 10a Interposition member (tubular part)
10b Core material (core part)
10e taper

Claims (4)

A golf club in which an interposition member is provided between a shaft fixing hole formed in a pipe shape extending from the top portion of the hollow head body to the sole portion and the shaft, and a core material is inserted at the tip side of the shaft center hole. Te, the intermediate member and the core is made of a soft material than the material constituting the head body, wherein one of the intervening member and the core material Oyobi above the longitudinal direction of the shaft than the other, of the shaft fastening hole A golf club characterized in that an annular gap is formed between an upper end side and a shaft. The golf club according to claim 1, wherein an upper end of the core member does not coincide with an upper end of the shaft fixing hole. The interposed member, golf club according to claim 1 or 2, characterized in that provided it extends over the longitudinal direction of the shaft than the core. Wherein the upper end portion of the intervening member, golf club according to any one of claims 1 to 3, characterized in that the taper is formed.

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