Title:
バドミントンラケット
Document Type and Number:
Japanese Patent JP7424096
Kind Code:
B2
Abstract:
A badminton racket 2 includes a shaft 4, a frame 6, a grip 8, and a string 10. A flexural rigidity value EI(2) of the shaft 4 at a second measurement point located at a distance of 75 mm from the grip 8 is smaller than a flexural rigidity value EI(1) of the shaft 4 at a first measurement point located at a distance of 35 mm from the grip 8 and a flexural rigidity value EI(4) of the shaft 4 at a fourth measurement point located at a distance of 155 mm from the grip 8. A flexural rigidity value EI(3) of the shaft 4 at a third measurement point located at a distance of 115 mm from the grip 8 is smaller than the flexural rigidity value EI(1) and the flexural rigidity value EI(4).
Inventors:
Wataru Kimitsuka
Application Number:
JP2020025156A
Publication Date:
January 30, 2024
Filing Date:
February 18, 2020
Export Citation:
Assignee:
Sumitomo Rubber Industries, Ltd.
International Classes:
A63B49/00
Domestic Patent References:
| JP2014045947A | ||||
| JP6071001A | ||||
| JP5068561U |
Foreign References:
| CN205252447U | ||||
| CN203763800U |
Attorney, Agent or Firm:
Ariko Patent Office