Combination smoke and heat detector alarm

Details Combination smoke and heat detector alarm Combination smoke and heat detector alarm

1974-06-13

1976-02-10

Caldwell, John W.

Communications: electrical

Systems

Call station

116106, 116137R, G08B 1704, G08B 1710

Patent

active

039381153

ABSTRACT:
A combination smoke and heat detector alarm including a self contained stored energy source in the form of a cylinder of compressed gas. A T-fitting connects to the cylinder and feeds separate conduit systems leading to individual sounding devices. A fusible element is interposed in one of the conduit systems to automatically permit transfer of the compressed gas to a first sounding device upon the presence of elevated temperatures. A solenoid operated switch is interposed in the other conduit system to normally prevent the flow of gas. The solenoid is responsive to a smoke detector and is wired to open the solenoid valve upon sensing the presence of a predetermined concentration of smoke.

REFERENCES:
patent: 3079886 (1963-03-01), Green, Jr.
patent: 3109409 (1963-11-01), Demay
patent: 3119368 (1964-01-01), Bernard
patent: 3153226 (1964-10-01), Jensen
patent: 3223068 (1965-12-01), Van Winkle

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