Fire heat detector and/or burglar alarm

Details Fire heat detector and/or burglar alarm Fire heat detector and/or burglar alarm

1975-12-30

1978-02-07

Swann, III, Glen R.

Communications: electrical

Systems

Call station

337320, 337323, 337328, 337332, 3402271, G08B 1704

Patent

active

040729338

ABSTRACT:
A detecting device for detecting heat due to the presence of fire for example. The detecting device includes an open-ended chamber closed by a resilient diaphragm. The diaphragm engages the open end to permit respectively the passage of air via an annular passageway formed between an outer peripheral portion of the diaphragm and a circumferential rim of the open end which it engages for closing the chamber, upon pressure build-up in the chamber due to the external temperature variation. This pressure build-up causes corresponding expansion of the diaphragm to thereby actuate an electrical circuit provided with means for emitting an audible sound. Means are also provided in the detector to make it operative in response to the presence of moving objects.

REFERENCES:
patent: 1199050 (1916-09-01), Cid
patent: 2735913 (1956-02-01), Bland et al.
patent: 3822371 (1974-07-01), Welsh

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