Title:
TENNIS RACKET
Document Type and Number:
Japanese Patent JP3415577
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve the resilience and the controllability of a tennis racket such as the surface stability and the operability and reduce the weight of the tennis racket at the same time.
SOLUTION: In a head part 3 surrounding a hitting face F and a part of a throat part 4 of a frame 2 made of a fiber-reinforced resin of the racket, the elastic modulus of the reinforcing fibers is set from 35t to 45t, the fiber angle of the reinforcing fibers is from 0 to 10 degrees in the longitudinal direction (axial direction) of the racket frame 2, the weight of the racket frame 2 is from 100 g to 280 g, and the absolute value of the difference &verbar F1-F2&verbar of the secondary natural frequency (F1) in the outer direction of the hitting face and the natural frequency (F2) of the strings is set from 0 Hz to 100 Hz.
Inventors:
Hiroyuki Takeuchi
Application Number:
JP2000327374A
Publication Date:
June 09, 2003
Filing Date:
October 26, 2000
Export Citation:
Assignee:
Sumitomo Rubber Industries, Ltd.
International Classes:
A63B49/02; A63B49/10; A63B102/02; (IPC1-7): A63B49/10; A63B49/02
Domestic Patent References:
| JP2261479A | ||||
| JP515617A | ||||
| JP1033719A | ||||
| JP1212579A | ||||
| JP11114099A | ||||
| JP2000233032A |
Attorney, Agent or Firm:
Kazumi Owada
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