Electronic sequential combination locking device

Details Electronic sequential combination locking device Electronic sequential combination locking device

1981-09-04

1983-11-29

Trafton, David L.

Communications: electrical

Selective

Having indication or alarm

307 10AT, 3403096, 340528, 340543, 180287, B60R 2504

Patent

active

044183305

ABSTRACT:
An electronic sequential combination locking device comprising a main switch to which a timer circuit is connected. The timer circuit is activated by the main switch to provide a timer output signal after a predetermined time lapse. An electronic switch means is connected to receive the timer output signal. An alarm is connected to the electronic switch means and is operable by the presence of the timer output signal. A combination lock circuit having a plurality of manually actionable switches is operable in a predetermined sequence to activate a supply switch and disable the electronic switch. The supply switch provides a supply to an operable means.

REFERENCES:
patent: 3422398 (1969-01-01), Rubin
patent: 3611287 (1971-10-01), Hoff et al.
patent: 3755776 (1973-08-01), Kotras
patent: 4205300 (1980-05-01), Ho et al.
patent: 4277777 (1981-07-01), Schulz
patent: 4320382 (1982-03-01), Roucek
patent: 4335370 (1982-06-01), Scalley et al.

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