Long life traffic control lamp and socket insert

Details Long life traffic control lamp and socket insert Long life traffic control lamp and socket insert

1984-06-01

1986-12-16

Chatmon, Saxfield

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Flashers

313318, 315 51, 315 71, H05B 3700, H05B 3900, H05B 4114

Patent

active

046299432

ABSTRACT:
A long-life incandescent lamp and a socket insert for use with conventional lamps to provide long life. The lamp includes a sealed glass envelope, a base fixedly attached to the glass envelope, a center contact fixedly attached to the base and electrically insulated therefrom, a pair of lead wires extending within the envelope, an illuminable filament disposed within the envelope and electrically connected between the lead wires, a diode electrically connected between the center contact and the one lead wire for half-wave rectifying current to the filament, and a resistor for providing a resistive bridge between the base and center contact. The resistor has a resistance substantially in excess of the resistance of the filament, preferably no greater than 27K ohms. In one embodiment, the resistor is electrically connected between the center contact and the base in parallel with the in-series combination of the filament and the diode. In another embodiment, the resistor is electrically connected between the anode and the cathode of the diode in series with the diode. An alternative embodiment is a socket insert for use with an incandescent lamp having a center base contact and operating on alternating current. The insert includes a support body positionable within a lamp socket between the lamp and the center contact of the socket, with a diode and a resistor connected in parallel therebetween.

REFERENCES:
patent: 3818263 (1974-06-01), Belko
patent: 3836814 (1974-09-01), Rodriquez
patent: 3869631 (1975-03-01), Anderson et al.
patent: 4435671 (1984-03-01), Wouk

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