Title:
RACKET FRAME
Document Type and Number:
Japanese Patent JP3474792
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To secure satisfactory strength and rigidity in practical use while reducing the weight of a racket frame and improve degree of freedom for design by arranging a reinforcement layer using carbon fiber whose tensile elastic modulus is within a specified range at least in a part of an outer layer constituting a racket frame made of fiber reinforcement resin.
SOLUTION: This racket frame is formed by a substantially elliptic batting part where a gut is stretched, a grip part, and a shaft part connecting the batting part and the grip part, and formed by disposing an outer layer 6 made of fiber reinforced resin in the periphery of a core material 5. In this case, the outer layer 6 is made of fiber reinforced resin which is reinforced by carbon fiber or glass fiber, and a reinforcement layer 7 made of fiber reinforced resin reinforced by carbon fiber having tensile elastic modulus of 650-1000 GPa is disposed in a part of the layer. That is, the reinforcement layer 7 is interposed in the outer layer 6 corresponding to both side surfaces 8a, 8b on the batting surface of the racket frame 1. Thus, the strength and rigidity of the racket frame 1 are improved.
Inventors:
Ryoji Higuchi
Mitsuya Watanabe
Mitsuya Watanabe
Application Number:
JP37088198A
Publication Date:
December 08, 2003
Filing Date:
December 25, 1998
Export Citation:
Assignee:
Mitsuno Co., Ltd.
International Classes:
A63B49/10; A63B49/02; A63B60/54; B32B5/26; A63B102/02; (IPC1-7): A63B49/10; A63B49/02; B32B5/26
Domestic Patent References:
| JP10328332A |
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