Title:
BADMINTON RACKET
Document Type and Number:
WIPO Patent Application WO/2022/145199
Kind Code:
A1
Abstract:
A badminton racket 2 has: a shaft 4; a grip 10 into which a portion of the shaft 4 in the vicinity of the butt end 20 is inserted; and a frame 6 attached in the vicinity of a tip end 22 of the shaft 4. An out-of-plane primary natural frequency ωo1 (Hz) and an out-of-plane secondary natural frequency ωo2 (Hz) in the natural vibration of the badminton racket 2 satisfy the following formula. ωo2 ≤ 2.5 × ωo1 + 23.0
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Inventors:
KIMIZUKA WATARU (JP)
UEDA MASAHIKO (JP)
UEDA MASAHIKO (JP)
Application Number:
PCT/JP2021/045542
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:
| JP2004041390A | 2004-02-12 | |||
| JP3069937U | 2000-07-04 | |||
| JP2013013550A | 2013-01-24 |
Attorney, Agent or Firm:
ARCO PATENT & TRADEMARK ATTORNEYS (JP)
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