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Title:
TENNIS RACKET
Document Type and Number:
Japanese Patent JP2001061998
Kind Code:
A
Abstract:

To design a lightweight racket and to improve its repulsive efficiency by determining a specific value of a number of gut holes providing at a gut spreading section surrounding a face surface as a hitting surface.

A frame of a tennis racket 1 is a hollow frame made of a fiber reinforcing resins, a gut spreading section 3 surrounding a hitting surface (a face surface), a sloat section 4, a shaft section 5, and a grip section 6 are continuously constituted. In the gut spreading section 3, the hitting surface 2 is annularly surrounded with a yoke section 7 that is continued at a sloat side and is formed of a different member. Weight of the tennis racket is more than 180 g and less than 260 g, a gut groove is provided recessing at an external side section of the gut spreading section 3, and gut holes are provided drilled at a fixed interval along a longitudinal direction. The gut holes are comprised of inner side holes contacting the hitting surface 2 and outer side holes of a bottom surface of the gut groove, and the inner side holes and the outer side holes are communicated through hollow sections. A number of the gut holes is more than 39 and less than 61.


Inventors:
TAKEUCHI HIROYUKI
SASAKI SADAHIKO
Application Number:
JP24327099A
Publication Date:
March 13, 2001
Filing Date:
August 30, 1999
Export Citation:
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Assignee:
SUMITOMO RUBBER IND
International Classes:
A63B49/02; A63B49/10; A63B102/02; (IPC1-7): A63B49/02
Attorney, Agent or Firm:
Kazumi Owada