Back-up and alarm circuit system

Details Back-up and alarm circuit system Back-up and alarm circuit system

1976-12-09

1978-11-28

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

219487, 219506, 219508, 307 39, 307131, 340652, 340664, G08B 2100, H05B 102

Patent

active

041278542

ABSTRACT:
Safety back-up and alarm circuit for loads such as electrical heaters and the like comprising a back-up substitute load for the primary load, e.g., an electric heater, switching circuits responsive to outputs from the primary and back-up loads, and which automatically replace the primary load with the back-up load upon failure of the primary load, said switching circuits including a circuit which reliably reads the output from the primary load and distinguishes failure of the primary load from mere non-load -- including impedance in the primary load circuit, a primary alarm element, e.g. a lamp, bell, or buzzer responsive through said switching circuits to a failure of the primary load and an energizing of the back-up load and a secondary alarm element, e.g. a bell or buzzer responsive to a failure of said back-up element.

REFERENCES:
patent: 3562580 (1971-02-01), Blomgren
patent: 3611432 (1971-10-01), Babcock et al.
patent: 3659146 (1972-04-01), Munson
patent: 4010457 (1977-03-01), Simpson

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