公开(公告)号：US20130102412A1

公开(公告)日：2013-04-25

申请号：US13650983

申请日：2012-10-12

Applicant: K.K. ENDO SEISAKUSHO

Inventor： Tomonari Funayama ,  Tomoyuki Sakai ,  Ken Ariyoshi

IPC: A63B53/04

CPC classification number: A63B53/0466 ,  A63B60/02 ,  A63B2053/0408 ,  A63B2053/0412 ,  A63B2053/0416 ,  A63B2053/0458 ,  A63B2053/0491

Abstract: A golf club having an increased moment of inertia and improved ball-hitting directionality is provided. A metal hollow golf club head comprises: a face portion; a crown portion; and a sole portion, and when the golf club has a lie angle of 60° with its club head volume being within 470 cm3, a moment of inertia about the axial line centered on the plumb line passing through the golf club head center of gravity is 5000 to 6000 g-cm2. In order to increase the moment of inertia, the thickness of the center portion of the crown portion is reduced by chemical etching, and a mass, including the portion of mass reduction, is positioned in the sole portion on the side of the toe portion; moreover, the separation distance from the center of gravity to the mass is increased.

Abstract translation: 提供了具有增加的惯性矩和改进的击球方向性的高尔夫球杆。 金属中空高尔夫球杆头包括：面部; 冠部; 并且当高尔夫球杆的球杆头体积在470cm 3内时，当高尔夫球杆具有60°的倾角时，围绕穿过高尔夫球杆头重心的铅垂线的轴线的惯性矩是 5000〜6000g-cm 2。 为了增加惯性矩，通过化学蚀刻来减小冠部的中心部分的厚度，并且包括质量减少部分的质量被定位在趾部侧的鞋底部分中; 此外，从重心到质量的分离距离增加。