Invention Grant
- Patent Title: Shaft for golf clubs
- Patent Title (中): 高尔夫球杆
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Application No.: US14504102Application Date: 2014-10-01
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Publication No.: US09399159B2Publication Date: 2016-07-26
- Inventor: Hirotaka Nakamura , Hiroshi Hasegawa
- Applicant: DUNLOP SPORTS CO. LTD.
- Applicant Address: JP Kobe-Shi
- Assignee: DUNLOP SPORTS CO. LTD.
- Current Assignee: DUNLOP SPORTS CO. LTD.
- Current Assignee Address: JP Kobe-Shi
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JP2013-206952 20131002
- Main IPC: A63B53/10
- IPC: A63B53/10

Abstract:
A shaft 6 includes a plurality of fiber reinforced resin layers s1 to s10. The plurality of layers include a first straight layer s1 in which a 0°-compression strength is the minimum and a second straight layer s9 in which a 0°-compression strength is the maximum. A specific tip part Tx which is a region between a tip end Tp and a position separated by 100 mm from the tip end Tp satisfies the following (a) to (c): (a) the first straight layer forms a innermost layer; (b) the second straight layer is arranged outside a central position in a thickness direction; and (c) when a 0°-compression strength of the first straight layer is defined as Cmin and a 0°-compression strength of the second straight layer is defined as Cmax, a difference (Cmax−Cmin) is equal to or greater than 550 MPa.
Public/Granted literature
- US20150094160A1 SHAFT FOR GOLF CLUBS Public/Granted day:2015-04-02
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