Tennis court line monitoring apparatus

Details Tennis court line monitoring apparatus Tennis court line monitoring apparatus

1974-03-25

1976-09-28

Apley, Richard J.

Amusement devices: games

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

Target

340323R, A63C 1906

Patent

active

039827593

ABSTRACT:
A line monitoring apparatus is disclosed which is particularly adapted for use in determining whether a ball lands inside or outside of an area having a premarked boundary, such as a line on a tennis court. The apparatus incorporates electrical circuitry which distinguishes between a player's foot or a ball activating the switching means monitoring so that a player cannot activate an audio or visual indicator. An embodiment of the system includes pressure operated switching means for monitoring the boundary, as well as a service foot fault detector.

REFERENCES:
patent: 2709592 (1955-05-01), McAvoy
patent: 3341204 (1967-09-01), McDonnold
patent: 3415517 (1968-12-01), Krist
patent: 3492440 (1970-01-01), Cerbone et al.
patent: 3774194 (1973-11-01), Jokay
patent: 3810148 (1974-05-01), Karsten

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