Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1978-09-25
1981-09-15
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340310R, 340538, 340635, 340693, 307116, 307 23, G08B 1710
Patent
active
042900573
ABSTRACT:
A primary load, such as a conventional household light bulb, is series connected to a power source. The conventional light switch is replaced by a series connected circuit to the source and lamp. The circuit has an energy storage capacitor and a diode. A secondary load, such as an alarm, is coupled across the capacitor through an SCR (Silicon Controlled Rectifier). A sensing circuit, such as a smoke detector, is also connected across the capacitor and triggers the SCR upon detection of an alarm condition. A timing circuit is coupled between the SCR output and the diode to intermittently control the light bulb operation at a predetermined frequency upon smoke detection or other alarm. A switch selectively places in the circuit a neon night light or dimmer circuit for the primary load. In an alternative circuit the primary load is operated at near full power during periods of non-alarm. In a further circuit the power source and primary load are coupled to actuate an alarm when either the power source or the primary load become inoperative. Additionally, in a circuit having a power source which is unidirectional, or DC, the sensor alarm features are incorporated and additionally an alarm is actuated when the primary load becomes inoperative.
REFERENCES:
patent: 3594751 (1971-07-01), Ogden
patent: 4093943 (1978-06-01), Knight
patent: 4138670 (1979-02-01), Schneider et al.
Caldwell Sr. John W.
Crosland Donnie L.
Seeger Richard T.
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