Title:
Racket frame
Document Type and Number:
Japanese Patent JP6053539
Kind Code:
B2
Abstract:
A head 4 of a racket frame has a gut groove 20. The head 4 includes side reinforcing layers 18. Each side reinforcing layer 18 is formed from a prepreg including carbon fibers and a matrix resin. The compressive elastic modulus of the prepreg is equal to or less than 100 GPa. The tensile elastic modulus of the prepreg is equal to or less than 100 GPa. The tensile elastic modulus of the carbon fibers is equal to or less than 160 GPa. Preferably, the prepreg includes amorphous carbon fibers.
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Inventors:
Yohske Yamamoto
Application Number:
JP2013016360A
Publication Date:
December 27, 2016
Filing Date:
January 31, 2013
Export Citation:
Assignee:
Dunlop Sports Co., Ltd.
International Classes:
A63B49/10
Domestic Patent References:
| JP11262546A | ||||
| JP2005027887A | ||||
| JP2000233032A | ||||
| JP11018631A | ||||
| JP9108385A |
Attorney, Agent or Firm:
Kengo Oka
Sumitomo Norio
Kuroyoshi Murohashi
Hiroshi Kasakawa
Kei Someya
Yukari Imamura
Sumitomo Norio
Kuroyoshi Murohashi
Hiroshi Kasakawa
Kei Someya
Yukari Imamura
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