Volleyball out of bounds detecting and indicating system

Details Volleyball out of bounds detecting and indicating system Volleyball out of bounds detecting and indicating system

1982-02-19

1983-12-27

Grieb, William H.

Amusement devices: games

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

Projectile backstop

273 29R, 340323R, A63B 7106

Patent

active

044226470

ABSTRACT:
The detection and indication of volleyball out of bounds occurrences is realized by means of a light beam type system that distinguishes between the volleyball and other beam disrupting agents. Two juxtaposed light beams, one over the other, and separated by a distance equal to 1.5 volleyball diameters are projected along and 0.5 volleyball diameters outside of the sideline and endline bounds of the volleyball court. The beams are separately monitored by detectors that respond to beam interruptions. The lower beam is spaced from the playing surface by about three inches. Visual out of bounds indicators are actuated by a control circuit that responds exclusively to lower beam interruptions.

REFERENCES:
patent: 3415517 (1968-12-01), Krist
patent: 3774194 (1973-11-01), Jokay et al.
patent: 3810148 (1974-05-01), Karsten et al.
patent: 3883860 (1975-05-01), Von Kohorn
patent: 3940139 (1976-02-01), Barnes
patent: 3982759 (1976-09-01), Grant
patent: 4004805 (1977-01-01), Chen et al.
patent: 4092634 (1978-05-01), Von Kohorn
patent: 4109911 (1978-08-01), Von Auken

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