Patent ID: 6056648
Filing Date: 2000-05-02
Classification: A63B,Y10S

Abstract:
A golf club shaft using a tube body made by winding fiber-reinforced prepeg formed from reinforcing fibers impregnated with synthetic resin, wherein said tube body has a front end portion to which a club head is to be attached, a grip portion provided opposite to said front end portion, and a torsional rigidity sudden-change portion provided between said front end portion and said grip portion, wherein torsional rigidity on a front end portion side in said torsional rigidity sudden-change portion is in a range of from 1 to 4 when torsional rigidity in said front end portion is assumed to be 1, wherein the torsional rigidity in said grip portion is at least 2500.times.10.sup.3 kg*mm.sup.2, and the torsional rigidity at said front end portion side of said sudden change portion is no larger than 1,500.times.10.sup.3 KG*mm.sup.2, and said front end side of said sudden change portion is located at a position at least 2/3 a length of said golf club from the front end portion, and wherein the rate of change in torsional rigidity relative to length in said torsional rigidity sudden change portion is larger than that in any other portion.