Line fault detector ball

Details Line fault detector ball Line fault detector ball

1985-09-23

1988-01-12

Marlo, George J.

Amusement devices: games

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

Target

273 58G, A63B 3900, A63B 3902

Patent

active

047186704

ABSTRACT:
A ball, for example a tennis ball, comprises a hollow resilient shell having a non ferromagnetic conductive layer interior of the shell. The conductive layer is preferrably aluminum and is held in place against an inner wall of the shell by an internal resilient mass. An eddy current can be induced in the layer when the ball passes through an oscillating field rendering the balls passage detectable. The metal layer is preferably not adhered to the shell and is resiliently biased against the shell interior side.

REFERENCES:
patent: 818050 (1906-04-01), Ritchie
patent: 2219074 (1940-10-01), Guillou
patent: 3082510 (1963-03-01), Kelly et al.
patent: 3774194 (1973-11-01), Jokay et al.
patent: 4300767 (1981-11-01), Reed et al.
patent: 4313607 (1982-02-01), Thompson
patent: 4375289 (1983-03-01), Schmall et al.

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