Portable fire detector

Details Portable fire detector Portable fire detector

1974-04-16

1976-03-09

Caldwell, John W.

Communications: electrical

Systems

Call station

340283, 200153A, G08B 2100

Patent

active

039434990

ABSTRACT:
A portable fire alarm device comprising fire detecting means and alarm means powered from a self-contained power supply. The power to the detector and alarm is through a normally closed switch of the type such as a mercury switch which may be opened by tilting the device to a predetermined angle from the vertical so that the alarm may be shut off.
A second normally open switch of the mercury type connects the power supply directly to the alarm device and is so oriented that tilting the device to a predetermined angle from the vertical closes said switch and energizes the alarm to test the condition of the battery.

REFERENCES:
patent: 3517382 (1970-06-01), Stein et al.
patent: 3660817 (1972-05-01), Abrams

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