Emergency exit lock system for doors

Details Emergency exit lock system for doors Emergency exit lock system for doors

1975-01-31

1977-02-01

Swann, III, Glen R.

Communications: electrical

Systems

Call station

70 92, 70432, 292 92, G08B 1308

Patent

active

040064719

ABSTRACT:
A lock system controls exiting and entering of personnel, particularly in public and commercial structures by means of an alarm and a panic bar and key system to operate a lock through a series of interlocking controls including an internal panic bar, an internal key lock, an external key lock and a supplemental manual control. Four modes of operation are provided in which the panic bar is at all times operative and the alarm is selectively operative to provide, in addition to panic bar actuation or in combination therewith, authorized passage, authorized exit only, free passage in both directions and free exit only.

REFERENCES:
patent: 785228 (1905-03-01), Phelps
patent: 2170521 (1939-08-01), Rodth
patent: 2287572 (1942-06-01), Rodth
patent: 3435643 (1969-04-01), Pollak et al.
patent: 3444546 (1969-05-01), Hawkins

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