Smoke and heat detector alarm

Details Smoke and heat detector alarm Smoke and heat detector alarm

1976-01-08

1978-04-11

Caldwell, Sr., John W.

Communications: electrical

Systems

Call station

116106, 116137R, 340229, G08B 1704, G08B 1710

Patent

active

040841570

ABSTRACT:
A smoke and heat detector alarm including a compressed gas, self contained, stored energy source. A T-fitting connects to the compressed gas tank through a fusible element activated valve and feeds separate conduit systems leading to individual sounding devices. One of the conduit systems receives compressed gas directly from the valve to automatically permit transfer of the compressed gas to a first sounding device upon the presence of elevated temperatures sufficient to fuse the fusible element. The valve includes a lever arm that is functioned by operation of the fusible element to trigger an additional electrical alarm circuit. 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 to permit transfer of the compressed gas to a second sounding device.

REFERENCES:
patent: 3391367 (1968-07-01), Messick
patent: 3938115 (1976-02-01), Jacoby

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