Patent ID: 6652389
Filing Date: 2003-11-25
Classification: A63B,D04C

Abstract:
A golf club shaft, comprising:a reinforced rip portion including a tip end; a gripping bun portion including a grip end; and an intermediate portion between the reinforced tip portion and the gripping butt portion, wherein the intermediate portion satisfies an equation EI=&agr;Â·X generally over its entire length, where EI (Nm2) is the flexural rigidity, X (mm) is the distance from the tip end of the shaft, &agr; is a given constant, and the deviation of &agr; is within the range of &agr; 0.003; wherein the deflection radius of curvature &rgr; is constant over the entire length of the shaft except for the reinforced rip portion at any temporal point during downswing.