Alarm system prior to firedoor drop

Details Alarm system prior to firedoor drop Alarm system prior to firedoor drop

1985-12-05

1988-11-15

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

49 31, 160 9, 160 10, G08B 1710

Patent

active

047852933

ABSTRACT:
A signalling system utilized in a firedoor control system. For warning and alerting personnel of the immanate (seconds) closing of a firedoor, to avoid injury of such personnel in the vicinity of the closing firedoor. The system is actuated by being responsive to either a smoke detector signal or to an electrical failure to the smoke detector. Means responsive to the smoke detector generates a first control signal, a first timer means generates a second control signal at the end of a first delay interval, and a second timer means generates a series of reoccurring control pulses transmitted to audible and visual signalling elements. A test means is provided to determined operational (functional) status of a rechargable battery utilized in the system in the event of an electrical failure to the smoke detector.

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patent: 4237654 (1980-12-01), Landem et al.
patent: 4365250 (1982-12-01), Matsuoka et al.

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