Electric lock

Details Electric lock Electric lock

1974-07-10

1976-02-24

Yusko, Donald J.

Communications: electrical

Digital comparator systems

317134, G08B 2100, H04Q 900, E05B 4900

Patent

active

039407381

ABSTRACT:
An electric lock and associated electronic control circuits, the circuit being activated by the insertion of a slotted key into a keyway where the presence and absence of slots at a number of positions is sensed by a set of photoelectric devices which deliver signals through appropriate microcircuit logic to energize electric solenoids actuating the bolt of the locking mechanism. Additional features are incorporated including a time-delay circuit for locking the door and an alarm latch to discourage tampering with the lock.

REFERENCES:
patent: 3622991 (1971-11-01), Lehrer
patent: 3659154 (1972-04-01), Finn
patent: 3688269 (1972-08-01), Miller
patent: 3735374 (1973-05-01), Rembault
patent: 3781804 (1973-12-01), Lederer, Jr.
patent: 3790957 (1974-02-01), Dukes, et al.
patent: 3838395 (1974-09-01), Suttill, Jr. et al.
patent: 3851314 (1974-11-01), Hedin

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