Title:
BADMINTON RACKET
Document Type and Number:
WIPO Patent Application WO/2022/145201
Kind Code:
A1
Abstract:
This badminton racket 2 satisfies mathematical expression (1.1) or (1.2). (1.1): y≥x+5.0, (1.2): y≤x–5.0. In mathematical expressions (1.1) and (1.2), y is determined by mathematical expression (1.3). (1.3): y=(ωo1*ωo2)1/2). In mathematical expressions (1.1) and (1.2), x is determined by mathematical expression (1.4). (1.4): x=EI1*7.0+EI2*0.28+71.0. In mathematical expression (1.3), ωo1 represents the out-of-plane primary natural frequency (Hz) of natural oscillation of the racket 2 under free-constraint conditions, and ωo2 represents the out-of-plane secondary natural frequency (Hz) of said natural oscillation of the racket 2. In mathematical expression (1.4), EI1 represents the cantilever rigidity (N/mm) of the racket 2, and EI2 represents the hitting surface rigidity (N/mm) of the racket 2.
Inventors:
KIMIZUKA WATARU (JP)
UEDA MASAHIKO (JP)
UEDA MASAHIKO (JP)
Application Number:
PCT/JP2021/045544
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:
| JP2005177442A | 2005-07-07 | |||
| JP2005027887A | 2005-02-03 |
Attorney, Agent or Firm:
ARCO PATENT & TRADEMARK ATTORNEYS (JP)
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