| 摘要 |
<p>PURPOSE:To prevent the compression breakage by the bending of a shaft without incurring the weight increase by the thickness increase of the shaft in the case that the hollow shaft of a club is made of material strong to tension and weak to compression. CONSTITUTION:In a shaft for a club such as a golf club, etc., the hollow shaft 11 is made to possess the tensile stress by blocking one end of the hollow shaft 11 and inserting a core material 14 shorter than the hollow shaft into the hollow shaft 112, and pressing the top of the bolt 12 screwed in the other end of the hollow shaft 11 against the end of the core material 14.</p> |
