GB647411A - Improvements in and relating to fluorescent lamp starter switches - Google Patents
Improvements in and relating to fluorescent lamp starter switchesInfo
- Publication number
- GB647411A GB647411A GB1607/48A GB160748A GB647411A GB 647411 A GB647411 A GB 647411A GB 1607/48 A GB1607/48 A GB 1607/48A GB 160748 A GB160748 A GB 160748A GB 647411 A GB647411 A GB 647411A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamp
- strip
- heater
- switch
- contacts
- 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
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
647,411. Supply systems for discharge lamps. BRITISH THOMSON-HOUSTON CO., Ltd. Jan. 19, 1948, No. 1607. Convention date, Jan. 18, 1947. [Class 38 (iv)] [Also in Group XXXVII] A thermal lock-out switch for a discharge lamp comprises normally-closed contacts 12, 13, carried by bi-metal strips 9, 14, the former of which gives ambient-temperature compensation. The contacts 12, 13, are connected in series with a low-resistance heater 16, which may be of the type described in Specification 624,410, the lamp filaments, and a glow discharge starter switch 7. The heater 16 is connected to the strip 14 by a member 17 of good heat-conducting material and a highresistance carbon heater 18 is connected to the strip at 20, by a short conductor 19. If the switch 7 fails to start the lamp, the strip 14 is heated gradually by resistance 16, so that contacts 12, 13, are eventually opened and the line voltage is applied across the lamp. If the lamp still fails to strike, the voltage appears across the heater 18 and after several starting attempts, the heat from 18 will be sufficient to maintain the strip 14 in its distorted position to lock out the switch. Specification 568,238 also is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US647411XA | 1947-01-18 | 1947-01-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB647411A true GB647411A (en) | 1950-12-13 |
Family
ID=22057982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1607/48A Expired GB647411A (en) | 1947-01-18 | 1948-01-19 | Improvements in and relating to fluorescent lamp starter switches |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB647411A (en) |
-
1948
- 1948-01-19 GB GB1607/48A patent/GB647411A/en not_active Expired
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