Method of making string holes in a sports racket frame

Details Method of making string holes in a sports racket frame Method of making string holes in a sports racket frame

1991-08-02

1993-08-10

Millin, V.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

273 73R, 273 73C, 273 73D, 264314, 264257, 264258, B29C 4514

Patent

active

052346579

ABSTRACT:
The method of making a sports racket frame with improved string holes includes a predetermined number of insertion pins pre-arranged in the molding cavity. The inner wall surface of the molding cavity adjacent to each insertion pin is filled with the fiber cement made of materials identical in quality with those making up the tubular strip used to form the racket frame. The sports racket frame so attained is composed of string holes which are integrally and simultaneously made with the racket frame as a unitary body and are provided with tubular support wall extending along the circumference thereof to reinforce the structural strength of the racket frame.

REFERENCES:
patent: 4061520 (1977-12-01), Cecka et al.
patent: 4264389 (1981-04-01), Staub et al.
patent: 4614626 (1986-09-01), Frerking
patent: 4891175 (1990-01-01), Haines
patent: 4935185 (1990-06-01), Mott
patent: 4981639 (1991-01-01), Mott

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