Title:
BADMINTON RACKET
Document Type and Number:
WIPO Patent Application WO/2022/145200
Kind Code:
A1
Abstract:
This badminton racket 2 comprises a shaft 4, a grip 10 where the vicinity of the back end 20 of the shaft 4 is inserted, and a frame 6 which is attached near the tip end 22 of the shaft 4. The out-of-plane primary natural frequency ωo1 (Hz) and out-of-plane secondary natural frequency ωo2 (Hz) of the natural frequency under free constraint conditions of the badminton racket 2 satisfy the numerical expression below. ωo2 ≥ 2.5 × ωo1 + 37.0
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Inventors:
KIMIZUKA WATARU (JP)
UEDA MASAHIKO (JP)
UEDA MASAHIKO (JP)
Application Number:
PCT/JP2021/045543
Publication Date:
July 07, 2022
Filing Date:
December 10, 2021
Export Citation:
Assignee:
SUMITOMO RUBBER IND (JP)
International Classes:
A63B49/00; A63B102/04
Foreign References:
| JP2013013550A | 2013-01-24 | |||
| JP3069937U | 2000-07-04 |
Attorney, Agent or Firm:
ARCO PATENT & TRADEMARK ATTORNEYS (JP)
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