Patent ID: 7427240
Filing Date: 2008-09-23
Classification: A63B

Abstract:
1. A shaft for golf clubs wherein provided that: a position 130 mm away from the head-side end of the shaft is defined as a first position; a position 130 mm away from the grip-side end of the shaft is defined as a tenth position, and positions provided by equally dividing the length between the first position and the tenth position into nine regions are defined as from a second position to a ninth position in this order from the head side; each flexural rigidity EI measured at ten sites of from the first position to the tenth position is defined as from EI( each point obtained by plotting the measurement values at the positions of ten sites on an X-Y coordinate plane, in which the X-axis represents the distance (mm) to the measurement position from the head-side end and the Y-axis represents the value of flexural rigidity EI(N·m the formula representing a line K that passes the T( the values (N·m the minimum value among the values at the Y-intercept b the slope “a” of the line K is 0.04 or greater and 0.06 or less, any one of the b the bmin is any one of b the value (b the value (b