Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3421/42A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Thomson Houston Co LtdfiledCriticalBritish Thomson Houston Co Ltd
Publication of GB556112ApublicationCriticalpatent/GB556112A/en
H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
H05B41/02—Details
H05B41/04—Starting switches
H05B41/10—Starting switches magnetic only
Landscapes
Circuit Arrangements For Discharge Lamps
(AREA)
Abstract
556,112. Electricity supply to discharge lamps. BRITISH THOMSON-HOUSTON CO., Ltd. March 16, 1942, No. 3421. Convention date, March 18, 1941. [Class 38 (iv)'] The starting "kick" for a discharge lamp 1 is produced, after the electrodes have been adequately heated, by the opening of the thermal switch 6 ; this energizes the coil 16 in parallel with the switch with the result that the armature 17 is attracted breaking the heating circuit (which includes the heater 13 of the switch 6) at 21, 22, rapidly, to give the starting impulse. When the lamp is started the thermal element, which is in two parts, one part 11 heated by 13 and the other set in the opposite direction to compensate the element as a whole for variations of ambient temperature, re-approaches the fixed contact but is prevented from actual engagement by a shoulder on the attracted armature. The armature is released if the supply fails.
GB3421/42A1941-03-181942-03-16Improvements in and relating to starting apparatus for electric discharge lamps
ExpiredGB556112A
(en)