发明名称 RACKET
摘要 PROBLEM TO BE SOLVED: To widen a sweet spot on a tip end side in a longitudinal direction within a frame.SOLUTION: A racket includes a shaft, a frame joined to a tip end side of the shaft in a longitudinal direction, and a grip joined to a rear end side of the shaft in the longitudinal direction. The frame has a plurality of through-holes which penetrate from an inner circumferential surface to an outer circumferential surface for inserting a string. In the through-hole which is configured for inserting the string along a width direction perpendicular to the longitudinal direction on a hitting surface of the racket and is positioned on the tip end side in the longitudinal direction rather than a center of the frame, a first angle made by a penetrating direction of the through-hole and the width direction is smaller than a second angle made by a normal line in the inner circumferential surface at a position where the through-hole is provided and the width direction.
申请公布号 JP2014226383(A) 申请公布日期 2014.12.08
申请号 JP20130109183 申请日期 2013.05.23
申请人 YONEX CO LTD 发明人 YAMANAKA YOSUKE;OTANI KAZUYA
分类号 A63B51/06;A63B49/02 主分类号 A63B51/06
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