JPH0226520Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a head for a golf club.
In particular, the object is to provide an excellent alternative to wooden heads.

In the past, persimmon trees were mainly used for golf heads, but due to their size, persimmon trees can be used as heads, but the production volume is very small and it is difficult to obtain them, and since they are made of wood, they are easily affected by moisture and are not used anymore. There are also concerns about poor balance and cracking, and in recent years, the use of plastic has been considered. Glass fiber-reinforced plastics are attracting attention as one such plastic. However, glass fiber-reinforced plastic has a higher specific gravity than persimmon wood, and therefore, in a golf club whose head is made of glass fiber-reinforced plastic, the balance is biased toward the head, resulting in
Problems like this are inevitable when flight distance and head speed decrease.

The head for a golf club according to the present invention can provide good balance even if it is made of glass fiber-reinforced plastic, and a two-part hollow body made of fiber-reinforced plastic is molded and covered with glass fiber-reinforced plastic. This is a configuration characterized by the following.

Hereinafter, the present invention will be described with reference to embodiments.

FIG. 1A shows a longitudinal sectional view of the hollow body used in the present invention, and FIG. 1B shows a bb--b sectional view in FIG. 1A.

In Fig. 1A and Fig. 1B, 1 is an egg-shaped two-part hollow body (hereinafter simply referred to as a hollow body) formed from glass or carbon fiber reinforced plastic.
The upper piece 1a and the lower piece 1b are molded, respectively, and then these are combined. 11 is a rib provided in the hollow body 1 and may be omitted. This rib is perpendicular to the face 31 of the head shown in FIG. 2B and is effective in adjusting the repulsion characteristics of the hollow body 1. Reference numeral 2 denotes a metallic sole plate, which has a retaining pin 21 and is fixed to the lower piece 1b of the hollow body 1.

FIG. 2A is a cross-sectional view of the head for a golf club according to the present invention, and FIG.
b shows a cross-sectional view, respectively. In FIG. 2A and FIG. 2B, 1 is the above-mentioned hollow body, 3 is a hollow body molded and coated in the shape of a wood head,
It is a glass fiber reinforced plastic. 31 is a face, and 32 is a shaft attachment hole. The shaft can be a steel shaft or a carbon fiber-reinforced plastic shaft (manufactured by flyment winding or sushi winding method), and the shaft can also be attached at the time of covering the wood head with the mold.

In the above, the amount of glass fiber in the glass fiber reinforced plastic used for the hollow body 1 is usually 5 to 60% by weight, the glass fiber has a length of 0.2 to 35 mm, and the resin includes epoxy resin, polyester resin, etc. Can be used. Furthermore, the same glass fiber reinforced plastic as that used for the hollow body can be used for the mold covering.

For these glass fiber reinforced plastics, for example, 100 parts of unsaturated polyester resin (parts by weight, the same applies hereinafter) is used as the resin, and 100 parts of calcium carbonate, 3 parts of zinc stearate, and 1.5 parts of catalyst Perbutyl Z are used. , 1 part BPO, magnesium oxide
2.5 parts and 100 parts of chopped strands with a length of 6 mm as glass fibers can be used. If 20 parts of black vinylon fiber (length 1-6 mm) is further added to this mixture, a marble pattern can be created. The inside of the hollow body 1 can be filled with foamed plastic such as foamed urethane or foamed EVA in order to adjust the hitting sound.

In this invention, the hollow body is used to adjust the balance of the golf club, and the dimensions and thickness of the hollow body vary depending on the weight of the club shaft, but the total capacity of the head is 100 cm (usually 190 to 200 cm ³ ). On the other hand, the capacity of the hollow body is usually 15 to 70 cm ³ , and the thickness of the hollow body is usually 3 mm or more. In particular, as the thickness of the lower part of the hollow body (indicated by t in Figure 2B) is increased, the center of gravity of the head can be lowered and the directionality of the head can be improved. ) can be made wider, so
The thickness is preferably 6 to 10 mm.

As mentioned above, the golf club head according to the present invention has a hollow body divided into two parts, an upper piece and a lower piece, and is made by strongly compressing the primitives between the core mold and the cavity mold. Since each divided piece can be formed with high density and mechanically strong, it is possible to create a golf club head that has sufficient mechanical strength against the impact load when hitting a ball, despite the embedded hollow body. Can be provided. Then,
It is possible to manufacture a mechanically superior head for embedding a hollow body, and in this case, the weight of the head can be adjusted by selecting the volume of the hollow body, so even if it is made of glass fiber reinforced plastic, it is possible to create a head made of persimmon wood. Similarly, it can provide excellent balance. Furthermore, due to the appropriate hardness of the glass fiber reinforced plastic, the hitting sound is as good as that made of persimmon wood. Therefore, according to the present invention, an excellent golf club head made of glass fiber reinforced plastic can be provided.

[Brief explanation of the drawing]

FIG. 1A is an explanatory diagram showing the hollow body used in the present invention, FIG. 1B is an explanatory diagram of the bb-b section in FIG. 1A, and FIG. 2A is an explanatory diagram showing the head for a golf club according to the present invention. FIG. 2B is an explanatory cross-sectional view taken along line bb in FIG. 2A. In the figure, 1 is a hollow body, 11 is a rib, 2 is a sole plate, and 3 is a mold covering.

Claims (1)

[Claims for Utility Model Registration] (1) A head for a golf club, characterized in that a two-part hollow body made of fiber-reinforced plastic is molded and covered with glass fiber-reinforced plastic. (2) The head for a golf club according to claim 1 of the above-mentioned utility model registration, characterized in that a rib is provided inside the hollow body. (3) The head for a golf club according to claim 1 or 2 of the above-mentioned utility model registration claim, characterized in that a sole plate is fixed to the lower part of the hollow body. (4) The head for a golf club according to any one of claims 1 to 3 of the above-mentioned utility model registration claim, characterized in that the hollow body is filled with a foam.