JP2001137391A - Golf club and shaft fastening member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club and a shaft fastening member that prevents concentration of stress in an area where the shaft is fastened to the head. SOLUTION: A golf club is provided with an interposing member 10a between the shaft fastening hole 2 of a head body 1 and a shaft 5, and a core 10b inserted into the tip side of the center hole 5a the shaft. The interposing member 10a and the core 10b are formed of a material softer than the head body 1, either of the interposing member 10a or the core 10b extends more upward in the longitudinal direction of the shaft than the other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a shaft fastening member used for fastening a shaft to a golf club and a head.

[0002]

2. Description of the Related Art In a conventional golf club, a head end of a shaft having a center hole in a longitudinal direction is inserted into a shaft fixing hole provided in a head body, and the shaft fixing hole and the outer peripheral surface of the shaft distal end portion are bonded. The shaft is fastened to the body.

Further, Japanese Utility Model Application Laid-Open No. 50-129266 discloses that a tubular reinforcing member is provided between a shaft outer peripheral surface and a shaft fixing hole at a joint portion between a head main body and a shaft, and a rod-like reinforcing material is provided in a central hole of the shaft. Thus, a golf club having a reinforced joint is disclosed.

[0004]

However, the above-mentioned tubular reinforcing member and rod-like reinforcing member of the golf club disclosed in the above-mentioned publications have an entire area where a shaft is fixed to a head body,
That is, it is provided from the sole side of the shaft fixing hole to the hosel tip position. Therefore, the shaft is reinforced immediately at the lower end with the upper end of the hosel as a boundary, and there is a disadvantage that stress is concentrated on the boundary and the shaft is easily broken.

The present invention has been made in view of the above-mentioned problems, and has as its object to provide a golf club and a shaft fastening member which do not cause stress concentration in a fastening area of a shaft to a head body. I do.

[0006]

In order to solve the above-mentioned problems, a golf club according to the present invention is provided with an intervening member between a shaft fixing hole of a head body and a shaft, and a core provided at a tip end side of a shaft center hole. A material is inserted, and the interposed member and the core material are formed of a material softer than the head body, and one of the interposed member and the core material extends above the other in the longitudinal direction of the shaft. And

In the golf club of the present invention, an intervening member is provided between the shaft fixing hole of the head main body and the shaft, and a core material is inserted into a tip end side of the shaft center hole. The material is formed of a material softer than the head body, and an upper end of at least one of the interposition member and the core material does not coincide with an upper end of the shaft fixing hole.

According to another aspect of the present invention, there is provided a shaft fastening member arranged in a shaft fastening hole of a head body to fasten a shaft to the head body. The attachment member includes a tubular portion interposed between the shaft fixing hole of the head main body and the shaft, and a core inserted into the distal end side of the shaft center hole, and the tubular portion and the core are integrally formed. It is characterized by being molded.

[0009]

1 to 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, FIG. 1B is a cross-sectional view of the shaft fixing portion, and FIG.
Is a cross-sectional view showing the structure of a head body, a shaft, and a shaft fixing member, and FIG. 3 is a cross-sectional view showing a state where the shaft is fixed to the head body.

The golf club of this embodiment has a head body of a hollow wood type. In this case, the head body 1 includes the top portion 1a and the sole portion 1
b, a toe portion 1c, a back portion 1d, a heel portion 1e, and a face portion 1f, and are formed in a hollow shape by welding a plurality of outer shell members. Specifically, each outer shell member is formed of a metal material such as titanium, a titanium alloy, and stainless steel by casting, pressing, forging, or the like, independently or by integrating arbitrary members, and these are formed. The head body 1 is formed by being mutually welded.

The head main body 1 is provided with a shaft fixing hole 2 formed in a pipe shape so as to penetrate from the top portion 1a to the sole portion 1b. The shaft 5 is fixed via the attachment member. The shaft 5 is made of metal or fiber reinforced resin and has a center hole 5a.

A shaft fixing member 10 is disposed in the shaft fixing hole 2, and the shaft 5 is fixed to the head main body 1 via the shaft fixing member 10. The shaft fastening member 10 is integrally formed of a material softer than the material forming the head body 1, for example, metal (aluminum alloy or the like), synthetic resin, fiber reinforced resin, rubber, or the like.

A shaft fastening member 10 is fitted into the shaft fastening hole 2 and is interposed between the shaft 5 and an intervening member (tubular portion) 10a, and extends axially inside the intervening member 10a. The shaft 5 has a core (core) 10b into which the distal end of the center hole 5a is fitted. The intervening member 10a and the core 10b are integrated via a base 10c. The base portion 10c is formed with a large diameter portion 10d whose diameter gradually increases as it goes downward.

The intervening member 10a and the core member 10b are formed so that one of them is high, that is, one of them extends upward in the longitudinal direction of the shaft. In this embodiment, the interposition member 10a is formed to be higher than the core material 10b, and the height thereof is
When it is fitted into the shaft fixing hole 2, it is formed low so as not to coincide with the upper end of the shaft fixing hole 2 as shown in FIG. As a result, the annular gap S is defined on the upper end side of the shaft fixing hole 2 because the intervening member 10a does not exist. Further, a taper 1 is formed at the upper end of the intervening member 10a so that the diameter thereof gradually decreases as going upward.
0e is preferably formed.

When the shaft 5 is actually fastened to the head main body 1 using the shaft fastening member 10 as described above, first, the shaft fastening member 10 is inserted into the shaft fastening hole 2 from the sole portion 1b side. With the large diameter portion (stopper portion) 10d abutting on the surface of the sole portion 1b, the shaft fastening member 10 is attached to the outside of the interposition member 10a with an adhesive, and is adhesively fixed to the shaft fastening hole 2. . next,
The shaft 5 is inserted from the top part 1a into the shaft fixing hole 2, and the core material 10b is fitted in the center hole 5a.
The shaft 5 is bonded and fixed to the shaft fastening member 10. Therefore, the tip of the shaft 5 is
Is bonded and fixed to the inside of the interposed member 10a and the core material 10b. FIG. 3 shows a state in which the above-described bonding step has been completed. In this state, the protruding portion (base portion 10c) of the shaft fastening member 10 and the lower end portion of the shaft 5 such that the sole portion 1b is flush. To form a golf club as shown in FIG. 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 material 10b in the shaft center hole 5a.

According to the golf club having the shaft 5 fixed thereto, the following effects can be obtained. Since the upper end position of the interposition member 10a of the shaft fastening member 10 and the upper end position of the core material 10b are different, when the shaft 5 bends, such as when hitting a ball, stress concentration in the shaft fastening region is prevented, and the shaft is damaged. Can be effectively suppressed. At this time, the core member 10b prevents the shaft 5 from being deformed so as to be crushed, thereby suppressing damage to the shaft. Particularly, since the taper 10e is formed at the upper end of the interposition member 10a, stress concentration can be more effectively suppressed. In the present embodiment, the upper end position of the interposition member 10a is
Since the gap S is formed lower than the upper end position of the shaft fixing hole 2, the effective length of the shaft is increased, and as a result, the head can easily return in the vertical direction when hitting a ball, and the ball can be launched high. Becomes possible. still,
If a hole communicating with the gap inside the interposition member 10a of the shaft fastening member 10 is provided on the base 10c side, air escape during adhesion of the shaft 5 is good, and it is easy to insert the shaft 5 inside the interposition member 10a.

FIG. 4 is a view showing a second embodiment of the golf club and the shaft fastening member according to the present invention.
FIG. 4A is a perspective view of a golf club, and FIG. 4B is a cross-sectional view of a shaft fixing portion.

In this embodiment, the shaft fastening member 1
The intervening member 10a of No. 0 extends further upward than the intervening member of the above-described embodiment, and its upper end position protrudes from the upper end position of the shaft fixing hole 2, that is, the top portion 1a. In this way, by lengthening the intervening member 10a, it is possible to adjust the bending of the shaft 5 to a state in which the bending of the shaft 5 is suppressed to some extent. Also in such a configuration, similarly to the above embodiment, when the shaft 5 bends, stress concentration in the shaft fixing region is prevented, and breakage of the shaft can be effectively suppressed.

FIG. 5 shows a third embodiment of the golf club and the shaft fastening member according to the present invention, and is a cross-sectional view of the shaft fastening portion.

The shaft fastening member 10 of this embodiment
Has a configuration in which the length relationship between the intervening member 10a and the core material 10b is the same as in the first embodiment, but the base 10c
Are formed such that the length of the shaft 5 in the longitudinal direction is increased and the distal end edge of the shaft 5 to be fixed is located above the sole portion 1b. That is, the shaft fastening member 10 is
The annular groove formed between the intervening member 10a and the core 10b is formed to be shallower than the structure shown in FIG.

In this embodiment, the same effects as those of the first embodiment can be obtained, and the lower end position of the shaft 5 and the thickness of the base 10c of the shaft fastening member 10 are variously deformed. Adjustment of weight balance can be performed.

FIG. 6 shows a golf club and a shaft fastening member according to a fourth embodiment of the present invention, and is a cross-sectional view of a shaft fastening portion.

The shaft fastening member 10 according to this embodiment
Is formed so that the core member 10b extends above the interposition member 10a in the longitudinal direction of the shaft, the upper end position of the interposition member 10a is inside the head body, and the upper end position of the core member 10b is above the top part 1a. It is formed so that it becomes.

Also in this configuration, similarly to 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. In addition, by increasing the length of the core material 10b, the alignment at the time of 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. Becomes

As described above, the shaft fixing member 10 is
It is only necessary that one of the intervening member 10a and the core member 10b extends above the other in the longitudinal direction of the shaft, and the specific length and the upper end position can be variously modified. Further, the present invention can be applied to iron type golf clubs other than wood type golf clubs.

[0026]

According to the golf club and the shaft fastening member of the present invention, stress concentration does not occur in the fastening region of the shaft to the head, and the damage to the shaft can be effectively suppressed. Furthermore, according to the seventh and eighth aspects, since the tubular portion and the core portion are integrally formed, it is easy to provide an intervening member between the shaft fixing hole and the shaft and a core member to be inserted into the shaft center hole. And the manufacturing cost can be reduced.

[Brief description of the drawings]

FIGS. 1A and 1B are views showing a first embodiment of a golf club and a shaft fastening member according to the present invention, wherein FIG. 1A is a perspective view and FIG.

FIG. 2 is a cross-sectional view showing a structure of a head 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 the shaft is fixed to the head main body.

FIGS. 4A and 4B are diagrams showing a golf club and a shaft fastening member according to a second embodiment of the present invention, wherein FIG. 4A is a perspective view and FIG.

FIG. 5 shows a third embodiment of the golf club and the shaft fastening member according to the present invention, and is a cross-sectional view of the shaft fastening portion.

FIG. 6 shows a golf club and a shaft fastening member according to a fourth embodiment of 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 fixing hole 5 Shaft 5a Shaft center hole 10 Shaft fixing member 10a Interposed member (tubular part) 10b Core material (core part) 10e Taper

Claims (8)

[Claims] 1. A golf club in which an intervening member is provided between a shaft fixing hole of a head main body and a shaft and a core material is inserted into a tip end side of a shaft center hole, wherein the intervening member and the core material are a head. A golf club formed of a material softer than the main body, wherein one of the intervening member and the core extends above the other in the longitudinal direction of the shaft. 2. A golf club in which an intervening member is provided between a shaft fixing hole of a head main body and a shaft and a core material is inserted into a tip end side of a shaft center hole, wherein the intervening member and the core material are a head. A golf club made of a material softer than the main body, wherein an upper end of at least one of the interposition member and the core material does not coincide with an upper end of the shaft fixing hole. 3. The golf club according to claim 1, wherein an upper end of at least one of the interposition member and the core does not coincide with an upper end of the shaft fixing hole. 4. The golf club according to claim 1, wherein the intervening member is provided above the core in a longitudinal direction of the shaft. 5. The golf club according to claim 1, wherein an intervening member is not provided on an upper end side of the shaft fixing hole of the head main body. 6. The golf club according to claim 1, wherein a taper is formed at an upper end of the intervening member. 7. A head body is provided in a shaft fixing hole of the head body,
A shaft fastening member used to fasten a shaft to a head body, the shaft fastening member comprising: a tubular portion interposed between a shaft fastening hole of a head body and a shaft; and a shaft center hole. And a core inserted into the distal end of the shaft fixing member, wherein the tubular portion and the core are integrally formed. 8. The shaft fastening member according to claim 7, wherein a taper is formed at an upper end of the tubular portion.