Volleyball net touch detecting and indicating system

Details Volleyball net touch detecting and indicating system Volleyball net touch detecting and indicating system

1982-02-19

1983-08-16

Grieb, William H.

Amusement devices: games

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

Projectile backstop

273 29B, 340323R, A63B 7106, A63B 6100

Patent

active

043987249

ABSTRACT:
Volleyball net touch violations are detected and an indicator identifying the offending team is actuated by a system that incorporates antennas into the volleyball net and utilizes radiant energy generated by court illuminating lights. A wire mesh antenna is affixed to each side of the net. The outputs of the antennas are amplified and compared with a reference. A player touching either net adds capacitance to the system producing a measurable signal. A NAND gate logic circuit determines which net was touched and actuates the appropriate indicator. The system does not respond to the volleyball which is a dielectric material does not add capacitance to the system.

REFERENCES:
patent: 3415517 (1968-12-01), Krist
patent: 3860240 (1975-01-01), Koch
patent: 3940139 (1976-02-01), Barnes
patent: 4081798 (1978-03-01), Pelfrey

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