JPS5991976A - Head of golf club - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a golf club head using long carbon fibers, and in particular to a wood portion such as a driver head. Basic fibers have been mixed into synthetic resin and molded by injection molding, but the direction of the fibers is aligned during injection, making it strong against impact from one direction, but weak against impact from other directions. Since increasing the amount of carbon fiber used makes it difficult to mold, it has been uninteresting to take advantage of the various advantages that carbon fiber has.

In order to eliminate this drawback, the present inventor developed a pre-prefabricated product such as a chopped long carbon fiber pre-prevated with a thermosetting resin, or a pre-prevated product such as a fiber pre-prevated with a woven or woven thermosetting resin. , we considered forming a golf club head by attaching it to the outer periphery of a core material made of urethane foam, but if a pre-preserved material was attached to the outer periphery of the core material to a certain thickness, it would not be possible to apply sufficient pressure even when molded with a mold. Therefore, small voids are created in the amount of prebraved material adhered to a certain thickness. It has been found that the presence of such voids causes the head body to crack or cave in due to impact when the golf ball is hit. Therefore, the present inventors coated the outer periphery of the core material to an appropriate thickness with a pre-braved material formed by pre-braving long carbon fibers with a thermosetting resin, and wrapped the outer periphery of this coating layer with an appropriate binding material. By tightening the bundle and compressing the coating layer, if the coating layer is tightened and compressed, the voids will also be compressed and removed, and if it is formed by heating and pressure molding, it will be possible to form the coating layer without any voids. It has been found that it is effective to obtain a spacing V of a golf club with a small amount. However, in order to perform this tightening with sufficient force, the core material must have sufficient strength for the tightening, and it must also be lightweight. Although the existing urethane foam materials meet the requirements of being lightweight to some extent, they are weak in strength and cannot withstand sufficient clamping or pressing force, making them extremely susceptible to breakage. As a result, the coating layer could not be sufficiently tightened, resulting in the formation of voids in the coating layer.

In addition, even when the coating layer is not formed by tightening, the urethane foam, etc. conventionally used as the core material absorbs dissolved resin, so when pre-placing long carbon fibers, extra resin must be attached. Zufu 3- It was an economical thing.

The present invention eliminates the above-mentioned drawbacks, and is made by providing a hollow core material on a synthetic resin plate, and attaching long carbon fibers to the outer periphery of this hollow core material. By providing a shaped core material, the core material can be given sufficient strength, so the outer periphery of the covering layer with long carbon fibers attached is tied and tightened with an appropriate binding material, and the covering layer is compressed. By forming the coating layer by tightening and compressing the coating layer, the voids are also compressed and removed, and by heating and press-molding this, a golf club head having no or very few voids can be obtained. In addition, even when the coating layer is not formed by tightening, the core material formed on the composite I & resin board does not absorb resin, but it is extremely economical to use only the resin necessary for pre-placing the stationmaster carbon fiber. It is something.

An embodiment of the present invention will be described below with reference to the drawings.(1)
is a hollow core material, and a synthetic resin plate may be molded into a hollow shape, but ABS resin, polyethylene resin-4= resin, or other appropriate resin is melted and this is formed into an appropriate molding method such as blow molding. A hollow synthetic resin plate may be provided as a core material. The coating layer (2) formed around the outer periphery of the hollow core material (1) is made of chopped long carbon fibers pre-prepared with thermosetting resin such as epoxy resin, or woven or moulded. The core material (1) is formed by attaching a pre-prefabricated material such as a thermosetting resin such as an epoxy resin to the outer periphery of the core material (1). Since the core material (1) is strongly formed into a hollow shape as described above, the covering layer (2) can be tightened and compressed by wrapping an appropriate bundle around the outer periphery of the covering layer (2). By compressing and removing the voids and molding them under heat and pressure, it is possible to obtain a golf club head that has no voids or has very few voids. This bundle may be a thread-like material or a tape-like material.The tape-like material is formed by cutting long carbon fibers into ML or knitted and blip-lave into appropriate widths, and the thread-like material is formed by cutting long carbon fibers into appropriate widths. Pre-prefabricated to a thickness of 5 mm, or made of metal, boron, or titanium. It should be noted that the description regarding the tightening of the coating layer (2) with the above-mentioned bundle is not an essential requirement of the present invention, but it is stated that when the configuration of the present invention is used, it is convenient to eliminate voids by the above-mentioned tightening. It is something that

In other different embodiments, this hollow core material (1)
is integrally formed from the head body (3) to the neck part (4), and the shaft 7) (inserted from the neck part (4))
By fixing the end of 5) to the sole wall (6), sufficient elasticity can be imparted to the neck part (4), so that the neck part (4) can be elasticized even when hitting a ball, especially when hitting a ball. Part (4)
This prevents strong stress from concentrating on the core material (1
) is integrally formed from the head V body (3) to the neck part (4), so that elastic deformation from the neck part (4) to the head body (3) during impact can be easily caused. ,
To reliably prevent damage to the neck part (4), which has conventionally occurred, without causing stress to be concentrated in one part.
〇- is completed and the neck part (4) is inserted by inserting the core material (1).
), which makes it possible to have a low center of gravity, and because it does not cause unnatural deformation, it is possible to obtain a sweet spot over a wide range. Matasha7)(!'))
is from the neck part (4) to the sole wall (6) of the head body (3).
) to ensure the connection between the shaft (5), the neck part (4) and the head body (3), and also to prevent the flexible curvature of the shaft (5) when hitting the head body. (3) and the length from the neck part (4) to the sole wall (6), compared to the conventional neck part (4) that is hard.
It is possible to obtain approximately the same effect as by making the shaft (5) longer.

The present invention is constructed as described above, and since sufficient strength can be given to the core material by providing a hollow core material on the synthetic resin plate, a covering layer provided by adhering long carbon fibers can be used. The outer periphery of the coating layer is compressed and removed by binding or pressurizing the outer periphery of the material with an appropriate binding material, and the voids are removed by heating and molding. You end up getting very few golf club heads.

In addition, even when the coating layer is not tightened, the urethane foam, etc. conventionally used as the core material absorbs the melted resin, so when applying buriplaving to long carbon fibers, it is necessary to avoid adhering excess resin. Although it was uneconomical,
Since the core material made of a synthetic resin plate does not absorb resin, only the resin necessary for pre-preparation can be used, making it extremely economical. In addition, since the core material is made of a hollow synthetic resin plate, it is extremely lightweight, making it possible to reduce the weight of the golf club head and distribute the weight of the club as desired, lowering the center of gravity and widening the sweet spot. It is possible to do so.

[Brief explanation of the drawing]

The drawings are thighs showing one embodiment of the present invention, FIG. 1 is a partially cutaway perspective view of a core material, FIG. 2 is a sectional view, and FIG. 38 is a partially cutaway perspective view showing another different embodiment. 4 are sectional views showing other different embodiments. (1)・・・Core material (3)・・・Head body (
4)...Neck n <c,>-----Shaft (6)...Sole wall 9- Fig. 1 (

Claims (2)

[Claims] (1) A golf club head characterized by having a hollow core made of a synthetic resin plate and having long carbon fibers attached to the outer periphery of the hollow core. (2) The hollow core material is integrally formed from the head body to the neck part, and the end of the shaft inserted from the neck part is fixed to the sole wall. golf club head.