GB532490A - Improvements in and relating to bimetallic thermal electric switches - Google Patents
Improvements in and relating to bimetallic thermal electric switchesInfo
- Publication number
- GB532490A GB532490A GB25077/39A GB2507739A GB532490A GB 532490 A GB532490 A GB 532490A GB 25077/39 A GB25077/39 A GB 25077/39A GB 2507739 A GB2507739 A GB 2507739A GB 532490 A GB532490 A GB 532490A
- Authority
- GB
- United Kingdom
- Prior art keywords
- heater
- coil
- switch
- metallic
- sept
- 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
- Thermally Actuated Switches (AREA)
Abstract
532,490. Thermal switches. BRITISH THOMSON-HOUSTON CO., Ltd. Sept. 1, 1939, No. 25077. Convention date, Sept 3, 1938. [Class 38 (v) A bi-metallic switch, primarily for connecting in series with the electrodes of arc discharge lamps, comprises a support 12 on which a heater coil 17 is mounted by conductors 13, 16 and a pair of co-operating contact members 19, 22 bearing contacts 24, 23, both .members 19, 22 being bi-metallic, and are or both having a part 50 curved round the heater coil 17 in close relation thereto. In the example shown one bi-metallic contact member 19, is spring biassed to follow the one 22 directly subjected to the heat of the coil 17 for a distance to delay the opening of the switch. The portion 21 of the strips 22 is initially unaffected by the coil 17 but later moves in a direction to add to the deflection of the contact 23. In a modification each has a curved portion round a heater, the heaters being of high and low wattage respectively. One or both strips may have a complete helical turn, one or both encircling a heater, and the heater may have a ceramic casing. The contacts may be of silver alloy to enable them to weld together temporarily to delay the breaking of the circuit. The switch may be enclosed in an atmosphere of gas at about 4 mm. pressure,
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US532490XA | 1938-09-03 | 1938-09-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB532490A true GB532490A (en) | 1941-01-24 |
Family
ID=21982900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25077/39A Expired GB532490A (en) | 1938-09-03 | 1939-09-01 | Improvements in and relating to bimetallic thermal electric switches |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB532490A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2243487A (en) * | 1990-04-27 | 1991-10-30 | Chun Shu Chiang | A thermal starter switch for fluorescent lights |
-
1939
- 1939-09-01 GB GB25077/39A patent/GB532490A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2243487A (en) * | 1990-04-27 | 1991-10-30 | Chun Shu Chiang | A thermal starter switch for fluorescent lights |
| GB2243487B (en) * | 1990-04-27 | 1994-11-23 | Chun Shu Chiang | Thermal switch starter for fluorescent lights |
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