GB554225A - Improvements in and relating to starting means for electric discharge devices - Google Patents
Improvements in and relating to starting means for electric discharge devicesInfo
- Publication number
- GB554225A GB554225A GB17067/42A GB1706742A GB554225A GB 554225 A GB554225 A GB 554225A GB 17067/42 A GB17067/42 A GB 17067/42A GB 1706742 A GB1706742 A GB 1706742A GB 554225 A GB554225 A GB 554225A
- Authority
- GB
- United Kingdom
- Prior art keywords
- strip
- lamp
- circuit
- switch
- energizing
- Prior art date
- 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
Links
Classifications
-
- H—ELECTRICITY
- 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
- H05B41/06—Starting switches thermal only
- H05B41/08—Starting switches thermal only heated by glow discharge
Landscapes
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
554,225. Thermal switches. BRITISH THOMSON-HOUSTON CO., Ltd. Dec. 1, 1942, No. 17067. Convention date, Dec. 6, 1941. [Class 38 (v)] An electric discharge lamp has a starting circuit including an automatic switch responsive to energizing the circuit for closing it and a second switch also responsive to energizing the circuit for closing the circuit independently and suspending further operation of the firstmentioned switch if the lamp fails to start. In the example, a bimetal strip 30 and two bimetal contact arms 25, 26 are provided. If 25, 26 close on slow discharge, and subsequently open in the normal way, and the lamp starts, strip 30 does not function. If repeated closings and openings of 25, 26 fail to start the lamp, the cumulative heating by the glow causes each end of strip 30 to close on to the nearest strip 25 or 26 and the short sircuit prevents subsequent glow. The strip 30 remains bent under the heating effect of the current therethrough. In a modification strip 30 is of inverted U-shape and makes contact with strips 25, 26 near their points of mounting. Specifications 538,072 and 542,853, [Group XL], are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US554225XA | 1941-12-06 | 1941-12-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB554225A true GB554225A (en) | 1943-06-24 |
Family
ID=21997686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB17067/42A Expired GB554225A (en) | 1941-12-06 | 1942-12-01 | Improvements in and relating to starting means for electric discharge devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB554225A (en) |
-
1942
- 1942-12-01 GB GB17067/42A patent/GB554225A/en not_active Expired
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