FRP racket frame and a method for producing the same

Details FRP racket frame and a method for producing the same FRP racket frame and a method for producing the same

1994-12-22

1996-05-14

Chiu, Raleigh W.

Amusement devices: games

Aerial projectile game; game element or accessory therefor...

Target

273 73R, 273 73F, A63B 4910, A63B 4902

Patent

active

055161006

ABSTRACT:
In production of a tennis or badminton racket frame in a mould under application of heat with pressure, an impervious tube is inserted into an FRP tubular material, a pair of such tubular materials are arranged in a spaced juxtaposition in the mould, a string guide strip having transverse, through string holes is inserted between the pair off tubular materials with it string holes being directed normal to the juxtaposition, and internal pressure is applied into the tubular materials during application of heat with pressure. Formation of the string holes is carried out concurrently with mould shaping of the racket frame, thereby greatly simplifying the process with reduction in cost. Absence of the conventional string hole drilling results in smooth opening of the string holes in the end product, thereby avoiding undesirable string breakage during setting under tension to the head of the racket frame.

REFERENCES:
patent: 3815660 (1974-06-01), Gallagher et al.
patent: 4185822 (1980-01-01), Li
patent: 4203596 (1980-05-01), Nagamoto
patent: 4365806 (1982-12-01), Reid et al.
patent: 4436305 (1984-03-01), Fernandez
patent: 4913434 (1990-04-01), Fischer
patent: 4983242 (1991-01-01), Reed
patent: 5314180 (1994-05-01), Yamagishi et al.
patent: 5460370 (1995-10-01), Tung-Han

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