Invention Grant
US09480891B2 Metal shaft having longitudinally varying hardness, golf shaft using the metal shaft, golf club using the metal golf shaft, method of manufacturing the metal shaft, and tempering apparatus
有权
具有纵向变化的硬度的金属轴，使用金属轴的高尔夫球杆，使用金属高尔夫球杆的高尔夫球杆，制造金属轴的方法和回火装置
- Patent Title: Metal shaft having longitudinally varying hardness, golf shaft using the metal shaft, golf club using the metal golf shaft, method of manufacturing the metal shaft, and tempering apparatus
- Patent Title (中): 具有纵向变化的硬度的金属轴，使用金属轴的高尔夫球杆，使用金属高尔夫球杆的高尔夫球杆，制造金属轴的方法和回火装置
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Application No.: US14798677Application Date: 2015-07-14
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Publication No.: US09480891B2Publication Date: 2016-11-01
- Inventor: Hiroyuki Ono , Masahito Iwase
- Applicant: NHK Spring Co., Ltd.
- Applicant Address: JP Kanagawa
- Assignee: NHK Spring Co., Ltd.
- Current Assignee: NHK Spring Co., Ltd.
- Current Assignee Address: JP Kanagawa
- Agency: Norris McLaughlin & Marcus, P.A.
- Priority: JP2014-155528 20140730
- Main IPC: A63B53/12
- IPC: A63B53/12 ; B21C37/06 ; C21D1/18 ; C21D9/00 ; C21D9/08 ; C22C38/00
Abstract:
A metal shaft includes a hollow tube made of metal, capable of having hardness varying in a longitudinal direction of the metal shaft while preventing increase in the number of variations on a shape of the metal shaft. The tube has a hardness pattern exhibited by hardness of the tube varying in a longitudinal direction of the tube according to Young's modulus or tensile strength of the metal varying in the longitudinal direction.
Public/Granted literature
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