Tennis racket

Details Tennis racket Tennis racket

1988-03-04

1990-03-27

Coven, Edward M.

Amusement devices: games

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

Target

273 73F, A63B 4902

Patent

active

049114441

ABSTRACT:
In a tennis racket whose frame and handle shaft are integrally made of fiber reinforced plastics and the frame defines a strung surface, the frame is so designed that its first thickness "t" in a direction of the strung surface is substantially uniform around the circumference of the frame and its second thickness "T" in a direction perpendicular to the strung surface is gradually varied. The second thickness is maximum at side sections of the frame interposing a sweet spot in the strung surface and is minimum at the top and bottom portions of the frame in such a manner that the maximum thickness is thicker in the range from 35% to 60% than the minimum thickness, which increases a weight per unit length of the frame toward the side sections.

REFERENCES:
patent: 3647211 (1972-03-01), Doessel et al.
patent: 4177990 (1979-12-01), Kajiwara
patent: 4561655 (1985-12-01), Mortvedt
patent: 4664380 (1987-05-01), Kuebler

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