Title:
PERSONALIZED RACKET
Document Type and Number:
WIPO Patent Application WO/2021/151269
Kind Code:
A1
Abstract:
A prestress is applied to a racket frame by using a pull cable and/or inflation, and, by adjusting the magnitude of the prestress applied, the stiffness of the racket frame is changed, and the tension of pulled strings is changed.
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| JPS5631765 | RACKET USING LONG THREAD |
Inventors:
XUE NIANQIANG (CN)
WANG ZIHAN (CN)
WANG ZIHAN (CN)
Application Number:
PCT/CN2020/089360
Publication Date:
August 05, 2021
Filing Date:
May 09, 2020
Export Citation:
Assignee:
XUE NIANQIANG (CN)
International Classes:
A63B49/02
Foreign References:
| CN111001142A | 2020-04-14 | |||
| DE4104988A1 | 1992-08-20 | |||
| CN200945337Y | 2007-09-12 | |||
| DE3912174A1 | 1989-10-26 | |||
| US5458331A | 1995-10-17 | |||
| CN206007955U | 2017-03-15 | |||
| CN102188801A | 2011-09-21 | |||
| CN86101676A | 1986-11-05 |
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