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Patent Searching and Data


Title:
RACKET FRAME AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JPH07194741
Kind Code:
A
Abstract:

PURPOSE: To provide a racket frame which is lightweight, is highly strong, is formed with gut holes simultaneously with frame molding and is improved in production efficiency.

CONSTITUTION: A tube blank consisting of a thermoplastic synthetic resin and reinforcing fibers is used as a material 20 for molding the frame at the time of molding a frame body. A silicone tube 21 is inserted into this tube blank. As a result, two pieces of the materials 20, 20 for molding the frame are laminated and arranged within the cavities 33 of molds 30 in a ball hitting direction orthogonal with a gut extension direction. On the other hand, a gut extending member previously and successively provided and formed with plural gut holes 14 in the circumferential direction of the frame is positioned and arranged between the materials 20 and 20 for molding the frame in the cavities corresponding to the gut hole forming parts in the frame stringing parts of the molds 30.


Inventors:
NATSUME YOSHIHIRO
Application Number:
JP34906893A
Publication Date:
August 01, 1995
Filing Date:
December 28, 1993
Export Citation:
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Assignee:
YAMAHA CORP
International Classes:
A63B51/10; A63B49/02; A63B49/022; A63B49/10; A63B51/12; A63B102/02; A63B102/04; (IPC1-7): A63B49/02; A63B49/10; A63B51/10; A63B51/12
Domestic Patent References:
JPS63309284A1988-12-16
JP53118762B
Attorney, Agent or Firm:
Akimoto Teruo