Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Plural radiant energy responsive devices
Patent
1976-01-28
1977-08-16
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Plural radiant energy responsive devices
250209, 250214AL, 250578, 315159, 361177, H05B 3702
Patent
active
040428532
ABSTRACT:
A circuit for controlling the energization of a night lighting load or the like, in which failure of the main circuit to control and shut off electrical supply to the load during daylight hours leads to permanent shutdown of the electrical supply to the load. Two photosensitive elements are provided in the circuit. One element, e.g. a photocell, is a main control which periodically operates a relay and supplies electricity to the load, i.e. at night. The second element, e.g. a second photocell, is connected in the circuit, together with a second relay, in such a manner that failure of the first relay to operate and open the load circuit during daylight hours will cause the second relay to operate and permanently open the load circuit.
REFERENCES:
patent: 1774457 (1930-08-01), Singleton
patent: 3081417 (1963-03-01), Collier
patent: 3835313 (1974-09-01), Stiefelmeyer et al.
patent: 3916183 (1975-10-01), Duve et al.
Area Lighting Research, Inc.
LaRoche Eugene R.
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