Security device for garage doors

Details Security device for garage doors Security device for garage doors

1975-10-02

1976-12-07

Swann, III, Glen R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

49 25, 70282, 292144, H04B 700

Patent

active

039965910

ABSTRACT:
A locking pin for a garage door is moved longitudinally in a bushing between a door frame and a movable door by an electric motor linked to the pin. The motor is selectively actuated in one direction by a radio receiver relay or a key switch. The motor moves the pin to its unlocked position and switches signal lamps from red to green. To lock the door again, a second radio signal or switching of the key switch opens a motor switch and a biasing spring in the motor returns the pin to its locking position.

REFERENCES:
patent: 2716567 (1955-08-01), Turcott
patent: 2756990 (1956-07-01), Reamey
patent: 2758836 (1956-08-01), Purdy
patent: 3233239 (1966-02-01), Crow et al.
patent: 3893121 (1975-07-01), Ringer

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