| 摘要 |
<p>PROBLEM TO BE SOLVED: To increase head speed even when the waist can not be rotated as intended by arranging an alloy provided with a super-elastic function parallelly to a shaft center in the intermediate layer of a shaft main body for a golf club. SOLUTION: This shaft A is molded in a tapered pipe shape by using a bias sheet for which the paralleled sheet 1 of carbon fibers (a) as highly strong and highly elastic fibers is cut so as to make the fiber direction cross at a prescribed angle with the shaft center and a straight sheet for which it is cut so as to make the fiber direction parallel to the shaft center. Then, for the arrangement of the bias sheet and the straight sheet, an innermost layer is constituted of the winding layer 1a of the bias sheet and the winding layer 1b of the straight sheet, the winding layer 1c of the paralleled sheet 2 for which the shape memory alloy (b) of the alloy provided with the super-elastic function is arrayed with a fixed interval among the fibers in the paralleled sheet of the carbon fibers (a) and the winding layer 1d of the straight sheet are successively arranged on the outer side.</p> |
