TAPERED HOLLOW SHAFT

Japanese Patent JP3296970

B2

PROBLEM TO BE SOLVED: To increase flex of a shaft while its bending strength is improved by a method wherein a carbon fiber having a specific elastic modulus is arranged on a straight layer of a hollow shaft.
SOLUTION: A fiber reinforced composite material made tapered hollow shaft containing reinforced fiber of 200GPa to 1,000GPa elastic modulus is generally composed of at least two layers of an askew crossing layer 2 and a straight layer 3. As a prepreg used for the askew crossing layer 2, a unidirectional prepreg is used. As the reinfoced fiber used for the prepreg, that of 200GPa to 1,000GPa tensile elastic modulus is used. As a prepreg used for the straight layer 3, the unidirectional prepreg is preferably used. As the carbon fiber used for the prepreg used for the straight layer 3, that of 5GPa to 156GPa tensil elastic modulus is generally used as an essential constituent. Further, the carbon fiber has preferably 0.8 to 5GPa tensil strength in order to maintain the bending strength.

JP4955512

Golf club shaft

Shinichi Takemura
Hideyuki Ohno
Yutaka Arai
Tomohiro Nakanishi

JP12217396A

July 02, 2002

April 19, 1996

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Nisseki Mitsubishi Corporation
Nippon Graphite Fiber Co., Ltd.
Nippon Steel Corporation
Nippon Steel Chemical Co., Ltd.

A63B53/10; B29C70/06; B29C70/20; B29C70/34; B32B1/08; B32B5/28; A63B102/32; B29K105/08; B29L9/00; B29L23/00; B29L31/52; (IPC1-7): B32B1/08; A63B53/10; B29C70/06; B32B5/28

JP768652A
JP768651A
JP5336864A
JP3290135A
JP5256183A
JP7329199A
JP898907A
JP2102267U

Tetsuya Ito

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