Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Plural circuit elements
Patent
1978-09-21
1979-12-11
Smith, Alfred E.
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Plural circuit elements
315 54, 315293, 315100, H01J 1734
Patent
active
041785355
ABSTRACT:
A fluorescent lampholder fitting has a preheat type circular fluorescent lamp with its ends in proximity and having a first end provided with a starting filament with a first and second filament terminal wire, and a second end provided with a second starting filament with a first and second filament terminal wire. A male screw base electrical connector extends axially along the lamp circle centerline from a housing which supports the lamp in a plane normal to the axis of the screw base. The screw base is provided with three electrical input connections which are adapted to be used in a three-way lampholder of a portable lamp or light fixture. A lamp starter is connected between the first lamp filament and the second lamp filament. A first ballast is connected between a center connection of the screw base and the second lamp filament, and a second ballast is connected between an intermediate ring connection of the screw shell and the second lamp filament; whereby the lamp will start and operate on the first ballast with input power applied to the screw shell and the center connection of the screw base, the second ballast with input power applied to the screw shell and the intermediate ring connection, and both ballasts in parallel with the input power applied to the screw shell and both remaining connections of the screw base.
REFERENCES:
patent: 2366252 (1945-01-01), Geiger
patent: 2504594 (1950-04-01), Schouwstra et al.
patent: 4105276 (1978-09-01), Miller
Roberts Charles F.
Smith Alfred E.
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