GB562031A - Improvements in and relating to switches for starting electric discharge devices - Google Patents
Improvements in and relating to switches for starting electric discharge devicesInfo
- Publication number
- GB562031A GB562031A GB15821/42A GB1582142A GB562031A GB 562031 A GB562031 A GB 562031A GB 15821/42 A GB15821/42 A GB 15821/42A GB 1582142 A GB1582142 A GB 1582142A GB 562031 A GB562031 A GB 562031A
- Authority
- GB
- United Kingdom
- Prior art keywords
- contacts
- strip
- heater
- lamp
- strips
- 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
Landscapes
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
562,031. Automatic control systems. BRITISH THOMSON-HOUSTON CO., Ltd. Nov. 9, 1942, No. 15821. Convention date, Nov. 12, 1941. [Class 38 (iv)] [Also in Group XXXVII] A thermal switch for starting an electric discharge lamp 3 has a heater 27 arranged across its contacts 14, 15, the heater serving to bring the contacts into engagement and then being short-circuited by them so that an interrupting action ensues in which each "break" causes a voltage surge tending to start the discharge between the electrode 2 of the lamp ; should the lamp not start after a certain number of attempts, a second heater 25 which is fully energized each time the contacts close and so gradually raises the temperature of a metal block 19 carrying one of the bimetallic strips 17, causes the contacts to remain permanently closed. On the other hand, should the lamp start, the reduced voltage across the heater 27 and a saturable reactor 28 is insufficient to cause the contacts to re-engage and they remain open. The contacts 14, 15 are mounted on two bimetallic strips by means of intermediate strips of low conductivity, e.g. of stainless steel, and in the form shown the strip 16 serves to compensate for variations of ambient temperature while the coils 27, 25 both heat the strip 17. In a modification, the coil 27 heats the strip 16 and the coil 25 the strip 17, and the strips both move towards each other when heated.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US562031XA | 1941-11-12 | 1941-11-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB562031A true GB562031A (en) | 1944-06-15 |
Family
ID=22002863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB15821/42A Expired GB562031A (en) | 1941-11-12 | 1942-11-09 | Improvements in and relating to switches for starting electric discharge devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB562031A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2215521A (en) * | 1988-03-10 | 1989-09-20 | Richard Palmer | Thermostat |
-
1942
- 1942-11-09 GB GB15821/42A patent/GB562031A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2215521A (en) * | 1988-03-10 | 1989-09-20 | Richard Palmer | Thermostat |
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