| 摘要 |
<p>PURPOSE:To enable to disperse localised concentration of stress caused by impact at the time of hitting ball on a shaft which is inserted in and fixed to a part of a head-hosel part and simultaneously to enable to improve durability by preventing breakage of shaft and enhance as well each strength of junction. CONSTITUTION:Bar-like materials for core part 10 is inserted and secured in an insertion hole 3 on a hosel part 2 of a head main body 1. An upper end part 10a of this bar-like material for core part 10 is made protruted from a hosel part 2. A tip part 5 of a shaft main body 4 is made inserted and held between insertion hole for a shaft 3 and material for core part 10.</p> |
