Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Target
Patent
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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