Shaft structure of golf club and production method of the shaft

Details Shaft structure of golf club and production method of the shaft Shaft structure of golf club and production method of the shaft

1991-03-29

1992-02-18

Grieb, William H.

Amusement devices: games

Aerial projectile game; game element or accessory therefor...

Target

273DIG23, 273DIG7, 428 363, 428257, A63B 5310

Patent

active

050887351

ABSTRACT:
A golf club shaft is produced by winding a plurality of material layers around a mandrel which is finally removed. The layers include an inner layer, an intermediate layer and an outer layer. The inner layer is formed of a cloth prepreg which is cut out so that its fibers have angles of about .+-.45.degree.. The cloth prepreg is wound around the mandrel. The inner layer may be formed of sheets formed of fibers which extend in a single orientation and have a high strength and a high modulus. The sheets are cut out with angles of .+-.30.degree. to .+-.45.degree.. The intermediate layer is formed of a uni-directional sheet formed of fibers extending in a single orientation, the intermediate layer being wound around an outer periphery of the inner layer. The outer layer is wound around an outer periphery of the intermediate layer, the outer layer being formed of a cloth tape prepreg prepared by a cloth tape formed by weaving warps formed of graphite yarns with other material yarns and of wefts formed of graphite yarns, the cloth tape prepreg being wound around the outer periphery of the intermediate layer with an angle of 70.degree. at a butt of the mandrel, an angle of 45.degree. at a tip thereof and decreasing angles at an intermediate portion between the butt and the tip.

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