JPH05207Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a wood golf club in which the club head is mainly made of fiber-reinforced plastic. This invention relates to a wood golf club having a reinforcing band made of fiber-reinforced plastic.

[Prior art]

Conventionally, the head of a golf club called a Utsudo golf club is made of persimmon wood, etc. (persimmon, etc.)
In recent years, club heads made mainly of fiber-reinforced plastic (FRP), especially carbon fiber-reinforced plastic (CFRP), have been developed and become popular instead of persimmon wood. There is.

By the way, most of the wood golf clubs made of fiber-reinforced plastics mentioned above are made of materials with low specific gravity, such as foamable synthetic resins such as hard urethane foam, or composites of micro hollow bodies with resin matrices such as epoxy resins. It has a structure in which a core body consisting of a syntactic foam or the like is incorporated.

This type of wood golf club, which is widely used, is either integrally molded with the core by compression molding or injection molding, or the outer layer (shell) is formed of fiber-reinforced plastic, and then the core material is formed. It is molded by being inserted and buried.

The sole of a wood golf club with this type of structure generally has a thin fiber-reinforced plastic layer between the core and the sole plate, and in the case of a golf club head that is exposed to harsh usage conditions, it has a high hardness. When a two-piece golf ball is used for a long period of time, cracks tend to occur between the sole plate and the fiber-reinforced plastic due to the impact of the ball, and this tendency is particularly noticeable in the thin portions of the fiber-reinforced plastic layer.

Furthermore, the generated cracks tend to grow along the edge of the sole plate from the face side to the back side, which contributes to shortening the life of the club head.

[Purpose of invention]

This invention was devised by focusing on the conventional problems, and its purpose is to improve the breaking strength of the fiber-reinforced plastic layer between the core and sole plate in the head of a wood golf club. To provide a wood golf club, which is configured to have a large impact force and effectively prevent cracks from occurring between the sole plate and the fiber-reinforced plastic layer due to the impact force of a hit ball, thereby extending the life of the club head. [Structure of the invention] In order to achieve the above object, this invention integrates a core body mainly made of syntactic foam inside the outer shell of a club head molded mainly from fiber-reinforced plastic. at least one groove substantially parallel to the face surface of the club head is formed in the sole portion of the core, and when forming the outer shell, the inside of the groove is made of fiber-reinforced plastic as a main material. The gist is that a reinforcing band is formed. In addition, the grooves formed in the sole portion of the core are formed on the face side and the back side, and when the outer shell is molded, the grooves are reinforced with fiber-reinforced plastic as the main material. It forms a band.

[Example of idea]

Embodiments of this invention will be described below based on the accompanying drawings.

FIG. 1 shows a perspective view of the external appearance of a wood golf club head 1 in which this invention has been implemented, and as shown in FIG.
and a core body 3 made mainly of syntactic foam inserted and buried in the hollow interior of the outer shell 2.

As shown in FIGS. 2 and 3, the wood golf club head 1 has a core body 3 embedded in the hollow interior of an outer shell 2, and an appropriate amount of carbon fiber reinforced plastic SMC (sheet molding). It is integrally molded with a compound (compound) by compression molding in a mold.

The sole portion 3a of the core body 3 has a width of 5 mm.
~15mm, preferably 7mm~10mm, and depth 3mm~
A single groove 4 of 15 mm, preferably 5 mm to 8 mm, is formed over the entire width and substantially parallel to the face surface 5 of the club.

Note that this groove 4 is not limited to one location, but may be provided in two or more locations, and is not limited to being provided approximately parallel to the face surface 5 of the club head 1 over the entire width of the bottom of the core body 3. sole plate 6
It is also possible to provide it only in places where cracks are likely to occur, such as the edges of the pipe.

Further, in the embodiment of this invention, the sole plate 6 was also integrally molded in the mold at the same time to create the wood golf club head 1.

The groove 4 formed in the sole portion 3a of the core body 3
A reinforcing band 7 mainly made of fiber-reinforced plastic is formed in the recess of the groove 4, and this reinforcing band 7 is filled with SMC (sheet molding compound) and hardened. This is what I did.

Next, FIG. 4 shows a second embodiment of this invention, in which the grooves 4 of the core body 3 are formed in two places, one on the face side 5 side and the other on the back side 5a. The reinforcing band 7 is mainly made of.

Next, a destructive test was carried out on the club head 1 using the wood golf club head 1 prepared according to this invention as described above, and as a result, the following effects were obtained.

By forming a thick reinforcing band 7 made of fiber-reinforced plastic approximately perpendicular to the direction in which cracks grow, that is, the line from the face 5 side to the back 5a side, on the sole portion 3a where cracks are likely to occur due to repeated impacts from golf balls. , it was possible to effectively prevent cracks occurring in the sole portion 3a, and to obtain a remarkable effect in inhibiting the growth of cracks.

It was also possible to integrally fix the core body 3 and the outer shell 2 made of fiber-reinforced plastic.

In addition, here, for the destructive test of club head 1,
As an accelerated fracture test, a ceramic ball having approximately the diameter of a golf ball was used instead of a golf ball, and the ball was repeatedly hit.

In the above example, the wood golf club head 1 was made of fiber-reinforced plastic using syntactic foam as the core material, but other materials such as hard urethane foam or other commonly used foamable synthetic resins may be used. Similar effects can be expected from the embodiments of this invention in all wood golf club heads that are mainly made of fiber-reinforced plastic using the core body 3.

[Effect of idea]

In this invention, a core body made mainly of syntactic foam is integrally embedded inside the outer shell of a club head molded mainly from fiber-reinforced plastic as described above, and in the sole part of the core body, At least one or more grooves are formed substantially parallel to the face surface of the club head, and when forming the outer shell,
Since a reinforcing band mainly made of fiber-reinforced plastic is formed inside the groove, it is possible to increase the breaking strength of the fiber-reinforced plastic layer between the core and the sole plate in the wood golf club head. Therefore, it is possible to effectively prevent cracks from occurring between the sole plate and the fiber-reinforced plastic layer due to the impact force of a batted ball, thereby extending the life of the club head.

[Brief explanation of drawings]

Figure 1 is an overall perspective view of a wood golf club head in which this invention was implemented, and Figure 2 is the same as that shown in Figure 1.
3 is a bottom view of FIG. 2, and FIG. 4 is a longitudinal sectional view showing a second embodiment of the invention. 1... Wood golf club head, 2... Outer shell, 3... Core body, 3a... Sole portion, 4...
Groove, 5...Face surface, 7...Reinforcement band.

Claims (1)

[Claims for Utility Model Registration] 1. A core body made mainly of syntactic foam is integrally embedded inside the outer shell of a club head molded mainly from fiber-reinforced plastic, and the sole part of the core body is embedded. A wood, characterized in that at least one groove is formed substantially parallel to the face surface of the club head, and a reinforcing band mainly made of fiber-reinforced plastic is formed inside the groove during molding of the outer shell. Golf club. 2. A utility model in which grooves are formed in the sole portion of the core body on the face side and the back side, and reinforcing bands mainly made of fiber-reinforced plastic are formed inside the grooves during molding of the outer shell. A wood golf club according to registered claim 1.