| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent breaking of a shaft by preventing separation consequent to pressing-up of a ferrule member caused by hitting impact under long-term use. SOLUTION: A tip side tip part 51 of a shaft 5 is inserted through an adhesive P into a small diameter part 41 large in diameter on the opening end 4a side of a shaft insert hole 4 formed in two wide-narrow stepped shape at a hosel part 3 of a head body 1. A small diameter skirt part 61 formed in stepped shape at a ferrule member 6 press-fitted and held to the tip side tip part 51 of the shaft 5 is fittingly mounted to a large diameter part 42 of the shaft insert hole 4. A clearance (b) is provided between the large diameter part 42 of the shaft insert hole 4 and an outer peripheral ferrule member 6, and a plurality of recessed grooves 7 are formed on the outer peripheral surface 61a of the skirt part 61 of the ferrule member 6.</p> |
