Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-09-07
1980-09-16
Waring, Alvin H.
Communications: electrical
Condition responsive indicating system
Specific condition
3403092, G08B 2100
Patent
active
042233070
ABSTRACT:
An alarm device indicates the occurrence of a power failure or other interruption of power supplied to businesses or residences which triggers the alarm indication only after the elapse of a predetermined adjustable delay interval commencing upon the occurrence of the power failure. The device includes a mechanically-operated timer-alarm device, the operation of which is controlled by a lock and release lever, with the lever position in turn controlled by an electrically-operated solenoid plugged into the circuit to be monitored. As long as the circuit supplies power to the solenoid, release of the timer is prevented. Upon occurrence of a power failure, the release of the lock and release enables the timer to begin timing out intervals of a preselected duration, after which the alarm is sounded.
REFERENCES:
patent: 2632887 (1953-03-01), Rusnak
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