Self ballasted lamp including a fuseable device

Details Self ballasted lamp including a fuseable device Self ballasted lamp including a fuseable device

1974-05-23

1976-07-06

Miller, Jr., Stanley D.

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Automatic shunt circuit closing or cut-out switch

315 49, 315119, 315125, 315127, 316 17, 316 24, 316 32, H01J 744, H05B 3700, H01J 946

Patent

active

039683966

ABSTRACT:
A filament coil is connected in series with an arc tube to form a self ballasted lamp. An internal starting coil is connected across the arc tube through a bimetal switch, which is normally closed, for energizing the starting coil. When an arc is struck and the tube temperature rises, the bimetal switch opens to cut out the starting coil. A fuse wire is connected across the bimetal switch to facilitate flashing of the filament coil by application of less than rated voltage during evacuation of the lamp envelope when the bimetal switch is normally open because of the elevated temperatures required for glass working and sealing. Upon subsequent application of rated voltage, the fuse wire melts and the lamp operates in its normal manner.

REFERENCES:
patent: 1616431 (1927-02-01), Rentschler
patent: 2329626 (1943-09-01), Krefft et al.
patent: 2671873 (1954-03-01), Meier
patent: 3285293 (1966-11-01), Matheson
patent: 3817591 (1974-06-01), Deiss

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