| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a golf club shaft which is collapse resistant and lightweight and its manufacturing method. <P>SOLUTION: The golf club shaft is made of a fiber-reinforced resin and has a straight or gently tapered large diameter section 10A formed in a prescribed length L2 from the base side end of the shaft and a tapered section 10B steeper than the large diameter section provided in the tip side adjacent to the large diameter section. A reinforcing layer P7 in which a reinforcing fiber is circumferentially directed is provided and an auxiliary layer P8 of a fiber-reinforced resin is provided outside the reinforcing layer in the length range including the steeply tapered section from the base side end of the shaft in addition to a body layer covering the overall length or 80% or more of the shaft, but not in the range of a prescribed length L1 from the base side end of the reinforcing layer. The external surface of the reinforcement layer is polished or ground and neither polishing nor grinding reaches the reinforcing fiber of the reinforcing layer. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
