Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1989-10-10
1992-06-09
Coles, Sr., Edward L.
Communications: electrical
Condition responsive indicating system
With particular system function
340628, 340514, G08B 2100
Patent
active
051211017
ABSTRACT:
Apparatus for providing integrated test circuits for a smoke detector is disclosed. The smoke detector operates such that products of combustion such as smoke and carbon monoxide cause the resistance across a sensor element to be lowered. The lowered resistance of the sensor element, in normal operation, causes a change in an associated voltage level. When the change in the associated voltage level is sufficiently large, the change is detected resulting in the generation of an alarm signal. In the present invention, a switch or button causes a circuit variation that results in a voltage level change similar to that attained when the voltage across the sensor changes as a result of the introduction of the products of combustion. Activation of the switch or button results in a generation of the alarm signal and tests the operational status of the smoke detector. A multiplicity of embodiments of the present invention are illustrated.
REFERENCES:
patent: 3882477 (1975-05-01), Mueller
patent: 4088986 (1978-05-01), Boucher
patent: 4595914 (1986-06-01), Siegel
patent: 4965556 (1990-10-01), Brodecki et al.
Jakubowski Peter J.
Pearce Randolph D.
Coles Sr. Edward L.
Holloway William W.
Jackson Jill
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