Magnetic key lock and alarm

Details Magnetic key lock and alarm Magnetic key lock and alarm

1975-07-03

1976-06-08

Swann, III, Glen R.

Communications: electrical

Systems

Call station

200 6166, E05B 4510

Patent

active

039626954

ABSTRACT:
A door lock carries an alarm and battery. The lock includes a tumbler system for cooperating with a serrated key. At the rear end of the key slot are located a pair of switches. One switch is normally open and is closed by the insertion of the key. The other switch is normally closed and includes a mass of iron on the switch wiper to be attracted by a magnet embedded in the key for opening the switch. The alarm, battery and switches are connected in a series circuit to cause the alarm to sound when a nonmagnet-bearing key is inserted in the key slot.

REFERENCES:
patent: 2767278 (1956-10-01), Collins
patent: 3705369 (1972-12-01), Schwendeman, Jr.
patent: 3733862 (1973-05-01), Killmeyer

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