Electric lamp and discharge devices: systems – Automatic substitution of the load device or electrode – With current shifting switch
Patent
1976-04-12
1976-12-21
Broome, Harold
Electric lamp and discharge devices: systems
Automatic substitution of the load device or electrode
With current shifting switch
315 90, 337 1, H05B 3910, H05B 4146
Patent
active
039990990
ABSTRACT:
An electrical receptacle device having a main lamp socket and an auxiliary socket adapted to receive an auxiliary lamp operative only upon failure of a main lamp in a main lamp socket. The two sockets are arranged in aligned opposition in a common housing providing a heating chamber in spaced, parallel relation with respect to the screw base ferrules along one side thereof. A slightly curved, elongated bi-metallic switch element extends along and within the heating chamber, having one end affixed to the main lamp socket ferrule and the other end positioned for movement in and out of contact, selectively, with the auxiliary lamp socket in response to temperature conditions in the heating chamber effected by non-operation and operation, respectively of a main lamp in the main lamp socket. The socket housing is integrally molded with a neck portion extending outwardly of the side opposite the heating chamber to terminate in a screw-in fitting for electrical connection in a ordinary lamp socket source of electrical supply. Externally-controlled adjustment means is provided for regulating the temperature change at which the auxiliary lamp socket is energized, to accommodate for variations in ambient temperature in the environment in which the thermostatically controlled receptacle device is installed.
REFERENCES:
patent: 1967521 (1934-07-01), Venard
patent: 3401368 (1968-09-01), Herion
Broome Harold
Schmidt Ernest H.
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