JPH0433867Y2 - - Google Patents

Description

[Detailed description of the invention] Recently, in order to improve the repulsive force of a wood head for a golf club, various methods have been devised in which the material of the head body is changed from wood to metal, carbon fiber reinforced resin, or the like. However, metal materials and carbon fiber-reinforced resins have a high specific gravity, and in order to make a head made of these materials the same weight as a head made of wood materials, it is necessary to reduce the size of the head body or increase the hollow volume inside the head. There is a need. However, reducing the size of the club head has the opposite effect of increasing the player's anxiety about hitting the ball, and increasing the hollow volume inside the head does not allow for sufficient wall thickness of the head body. This causes a problem in terms of strength, and it is not possible to obtain a pleasant feeling from the sound of the ball being hit.

Therefore, the inventors of the present invention conducted various studies to solve these problems, and as a result, they were able to reduce the hollow volume inside the head to a minimum without reducing the size of the conventional wooden head. In addition to ensuring sufficient wall thickness, we have succeeded in developing a material with an appropriate specific gravity that allows for a low center of gravity design.
We have arrived at this idea.

The present invention is as follows.

In a golf club head that has a hosel portion, a face portion, a head body portion, a shaft attachment port, and a hollowed out portion of the head body portion, the hosel portion and the face portion are made of a carbon fiber fabric reinforced thermosetting resin composite material that does not contain microballoons. The main body of the head is made of carbon fiber cut fiber reinforced thermosetting resin composite material containing micro balloons.
A carbon head for a golf club, wherein the outer periphery of the head is covered with a carbon fiber woven reinforced thermosetting resin composite material that does not contain microballoons.

The present invention will be explained according to the drawings. FIG. 1 shows a cross-sectional view of the carbon head. In the figure, 1 is the hosel part, 2 is the face part, 3 is the head body part, and 4
is the outer layer of the head, 5 is the hollowed out part of the head main body, and 6 is the hollowed out part of the head body.
indicates the shaft attachment port.

The hosel part 1 and the face part 2 are made of a carbon fiber woven reinforced thermosetting resin containing no microballoons and containing 60 to 75% by weight of carbon fiber woven fabric as a reinforcing material.

The head main body 3 has a length of 1 to 30 mm as a reinforcing material.
It consists of a thermosetting resin reinforced with carbon fiber cut fibers containing 20 to 50% by weight of carbon fiber cut fibers and 10 to 30 weight% of microballoons as a filler.

The head outer layer 4 does not contain microballoons,
It consists of a carbon fiber woven reinforced thermosetting resin containing 20 to 70% by weight of carbon fiber woven material as a reinforcing material. The carbon fiber reinforcement of the outer head layer 4 is in the form of a woven fabric.

In the present invention, carbon fibers are those normally used for FRP, and matrix resins are thermosetting resins such as epoxy resins, phenol resins, unsaturated polyester resins, polyimide resins, and furan resins. Also, what is a microballoon?
It is a hollow spherical material made of glass, carbon, phenolic resin, etc., with a specific gravity of 0.15 to 0.35 and a particle size of about 5 to 250 μ.

Since the carbon head according to the present invention contains a low specific gravity material containing microballoons in the internal head body, the carbon head has the same internal size and weight as various wood heads made of wood materials. The hollow volume can be reduced. Therefore, according to the present invention, a sufficient wall thickness can be ensured, so that a carbon head with excellent repulsive force and durability can be provided. Furthermore, since it is possible to design the club with a low center of gravity, it is possible to make the club easy to swing and handle. The head outer layer 4 in the present invention is made of a carbon fiber woven reinforced resin that does not contain microballoons, and has a thickness of 0.2~
It should be about 3mm. By providing such an outer layer, it is possible to increase the carbon fiber density of the outer layer of the head, increase its strength, improve durability, and increase the commercial value in terms of appearance.

The present invention will be explained below with reference to examples. In the Examples, "parts" are "parts by weight".

Example 100 parts of phenol novolak type epoxy resin,
Carbon fiber fabric impregnated with 40% by weight of 8 parts of dicyandiamide as a catalyst, weight 200g/
Thirty layers of carbon fiber woven prepreg (not containing microballoons) of m ² were placed on the face surface of a split mold for molding (face part fabrication).

On the other hand, the carbon fiber fabric prepreg (not containing microballoons) was wound around the release core to a total of 15 plies and fixed at a position corresponding to the shaft attachment (manufacturing the hosel part).

Then, add 5 parts by weight of 2-ethyl-4-methylimidazole to 100 parts of phenol novolak resin to the part corresponding to the head body, and add a length of 6 parts to the part corresponding to the head body.
30% by weight of carbon fiber cut fiber bars of mm, 12% by weight of glass micro balloons with a true specific gravity of 0.209.
The mixture was placed so that the hollow volume was 45 c.c., and heat treated at 80° C. for 30 minutes and then at 130° C. for 2 hours to harden the epoxy resin (fabrication of head main body).

After that, the cured product was demolded and cooled, and then five layers of the carbon fiber fabric prepreg (not including microballoons) were laminated around its outer periphery so that the thickness after curing was 1 mm, and the mixture was heated to 130°C. The head was heat-treated under pressure for 2 hours to cover the outer periphery of the head and integrate it (manufacture of carbon head).

The thus obtained carbon head has a face thickness of 12 mm, a top surface thickness of 6 to 10 mm, and a volume of 200 c.c.
(Head interior hollowed out part 45c.c.), weight 170g,
The carbon fiber fabric pattern stands out vividly on the outer surface of the carbon head, giving it a luxurious and elegant finish.

A general-purpose sole plate and a steel shaft were attached to this carbon head to serve as a driver (No. 1 wood), and a ball hitting test was conducted. As a result, the shot feel,
It was an easy-to-swing carbon club that had perfect flight distance and direction, giving players plenty of satisfaction.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the carbon head. In the figure, 1 is a hosel part, 2 is a face part, 3 is a head main body part, 4 is an outer layer of the head, 5 is a hollowed part inside the head, and 6 is a shaft attachment port.

Claims (1)

[Scope of utility model registration request] In a golf club head that has a hosel portion, a face portion, a head body portion, a shaft attachment port, and a hollowed out portion of the head body portion, the hosel portion and the face portion are made of a carbon fiber fabric reinforced thermosetting resin composite material that does not contain microballoons. The main body of the head is made of carbon fiber cut fiber reinforced thermosetting resin composite material containing micro balloons.
A carbon head for a golf club, wherein the outer periphery of the head is covered with a carbon fiber woven reinforced thermosetting resin composite material that does not contain microballoons.