Inclination signaling device on a tennis racquet

Details Inclination signaling device on a tennis racquet Inclination signaling device on a tennis racquet

1982-09-16

1985-08-20

Pinkham, Richard C.

Amusement devices: games

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

Target

273 73J, A63B 4908, A63B 6938

Patent

active

045359865

ABSTRACT:
An inclination signaling device with respect to the horizontal, namely associated with a racquet for a tennis game, comprising an enclosure having at least two juxtaposed planes forming a dihedral on which a ball contained in said enclosure can move, the first plane of the dihedral being arranged along the axis of the handle and perpendicularly to the plane of the stringed surface of the racquet, the second plane of the dihedral forming a maximum angle of 90.degree. with said axis and said first plane, and comprising an electrical contact at its end opposite the line of junction of the first and of the second plane, said electrical contact being connected to a signaling device, whereby said ball is projected onto said electrical contact under the effect of the centrifugal force in the course of play by rolling over said second plane of the dihedral and provides a signal if the axis of the racquet is dipped downwards.

REFERENCES:
patent: 2253796 (1941-08-01), Livingston
patent: 2914327 (1959-11-01), Eineta
patent: 2927286 (1975-12-01), Fohl
patent: 3935669 (1976-02-01), Potrzuski et al.

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