Visual alarm device interconnectable to existing monitoring circ

Details Visual alarm device interconnectable to existing monitoring circ Visual alarm device interconnectable to existing monitoring circ

1989-11-20

1991-04-16

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specified indicator structure

340635, 340686, G08B 2100

Patent

active

050086553

ABSTRACT:
A visual alarm device monitors the condition of a control and indication circuit and gives a distinct visual alarm upon detection of an abnormal condition in the monitored circuit. The device uses the indicator lights of the monitored circuit itself to give the visual alarm. The alarm device interconnects with the monitored circuit locally requiring no new cabling and remains in a passive state until an abnormal condition is detected. When the monitored circuit is rendered inoperative by a thermal overload trip, the alarm device becomes active to flash the indicator lights to provide a distinct visual alarm. Included in the device is a test switch, an appropriate voltage converter, an oscillator, and a power indication light.

REFERENCES:
patent: 3432841 (1969-03-01), Harvey et al.
patent: 4520354 (1985-05-01), Umeda et al.
patent: 4533905 (1985-08-01), Leivenzon et al.
patent: 4535325 (1985-08-01), Marsh

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