发明名称 IRON GOLF CLUB AND METHOD FOR MANUFACTURING THE SAME
摘要 An iron golf club is one made of metal material, which is manufactured integrally through press working and gives dedication to improvement of golf club design. The head (1) has a concave portion (4) surrounded by a convex portion (6) in the backside portion (3) behind the face portion (2). Treatment for making a mirror surface is applied to the bottom portion (5) of this concave portion through press working with a fixed die (11) having a surface roughness finer than the mirror surface for which treatment for making a mirror surface is to be performed and a movable die (10). Press working of this bottom portion can be also performed through treatment for making a mirror surface with a liner member (17).
申请公布号 US2012214612(A1) 申请公布日期 2012.08.23
申请号 US201213397818 申请日期 2012.02.16
申请人 KONDO RUI;HASEGAWA TAMOTSU;K. K. ENDO SEISAKUSHO 发明人 KONDO RUI;HASEGAWA TAMOTSU
分类号 A63B53/04;B21K17/00 主分类号 A63B53/04
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