Tennis rackets

Details Tennis rackets Tennis rackets

1974-10-04

1977-02-01

Apley, Richard J.

Amusement devices: games

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

Target

A63B 5102

Patent

active

040058638

ABSTRACT:
Tennis rackets having racket strings which are not round. The strings are provided with a cross-section of a geometrical shape such as to provide each string with two or more edges. The strings are also provided with a helical twist along their length during their formation by extrusion; they are also provided with approximately one-half of a helical twist per unit of length corresponding to the distance between adjacent cross-over points of the strings and at such points there is surface to surface rather than edge to edge engagement.

REFERENCES:
patent: 1531778 (1925-03-01), Gallaudet
patent: 1694360 (1928-12-01), Larned
patent: 2080642 (1937-05-01), Timpe
patent: 2847790 (1958-08-01), Tjernagel
patent: 2969984 (1961-01-01), Presnick
patent: 3744529 (1973-07-01), Jorda et al.
patent: 3926431 (1975-12-01), DeLorean

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