GB188131A - Improvements in and relating to electric switches - Google Patents
Improvements in and relating to electric switchesInfo
- Publication number
- GB188131A GB188131A GB2361221A GB2361221A GB188131A GB 188131 A GB188131 A GB 188131A GB 2361221 A GB2361221 A GB 2361221A GB 2361221 A GB2361221 A GB 2361221A GB 188131 A GB188131 A GB 188131A
- Authority
- GB
- United Kingdom
- Prior art keywords
- contact
- strip
- circuit
- thermal
- time
- 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
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed
- H01H43/30—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to thermal action
- H01H43/301—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to thermal action based on the expansion or contraction of a material
- H01H43/302—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to thermal action based on the expansion or contraction of a material of solid bodies
Landscapes
- X-Ray Techniques (AREA)
Abstract
188,131. British Thomson - Houston Co., Ltd., (General Electric Co.). Sept. 5, 1921. Automa.tic circuit-breakers, which may be employed for controlling the duration of energization of an X-ray tube and consequently to time an X-ray exposure, comprise a thermally-released switch in the supply circuit consisting of a comcompensated thermal strip heated by the supply current so that after an adjustable interval of time it bends sufficiently to release a spring-controlled contact-arm to break the circuit. As shown in Fig. 1, applied to this purpose, the circuit-breaker is mounted on a base and enclosed within a casing to give it an appreciable thermal capacity and consists of a contact arm 10, 12 normally held in contact with the fixed contact 13 by the thermal strip 15 against the action of the spring 14. The strip is mounted on a pivoted block 18 which carries also a second thermal strip 20 which compensates for variations of ambient temperature. The initial position of the latch strip 15 in relation to the end of the contact member may be adjusted by rotating a ram 12 by means of a handle 24 which carries an external pointer 25 indicating the time interval after which the switch will be tripped. It is reset by pressing the button 28 which engages the projection 29 from the contact-member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2361221A GB188131A (en) | 1921-09-05 | 1921-09-05 | Improvements in and relating to electric switches |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2361221A GB188131A (en) | 1921-09-05 | 1921-09-05 | Improvements in and relating to electric switches |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB188131A true GB188131A (en) | 1922-11-09 |
Family
ID=10198458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2361221A Expired GB188131A (en) | 1921-09-05 | 1921-09-05 | Improvements in and relating to electric switches |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB188131A (en) |
-
1921
- 1921-09-05 GB GB2361221A patent/GB188131A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB635516A (en) | Automatic electric circuit-breaker | |
| GB684736A (en) | Improvements in or relating to thermally-operated circuit breakers | |
| GB202321A (en) | Improvements in and relating to thermally controlled electric switches | |
| GB745744A (en) | Improvements in and connected with electric switches or circuit breakers | |
| GB557576A (en) | Improvements in overload switches | |
| GB188131A (en) | Improvements in and relating to electric switches | |
| GB955587A (en) | Pushbutton operated electric circuit breaker | |
| GB159478A (en) | Improvements in and relating to automatic electric cut-outs | |
| GB784866A (en) | Improvements in and relating to electric circuit breakers | |
| US2278990A (en) | Thermal switch | |
| GB653482A (en) | Improvements in or relating to snap-action electric switches | |
| GB993285A (en) | Automatic electric circuit breakers | |
| GB474563A (en) | Improvements in thermal responsive switches | |
| GB674864A (en) | Improvements in and relating to automatic electric circuit breakers | |
| GB206386A (en) | Improvements in and relating to the protection of electric machines and the like against overloading | |
| GB709114A (en) | An improved thermal over-current electric circuit-breaker | |
| GB418810A (en) | Improvements in thermally-controlled electric short-time switches | |
| GB556438A (en) | Improvements in electric switches having automatic tripping means | |
| GB841054A (en) | A thermally operated electric switch | |
| GB651883A (en) | Improvements in thermally tripped electric switches | |
| GB696299A (en) | Improvements in thermal overload devices for motor starting switches | |
| GB726871A (en) | Improvements in electric time-switches for signalling circuits | |
| GB739653A (en) | Improvements in thermally responsive electric switches | |
| GB820682A (en) | Thermally-operated snap-action electric switch | |
| GB671058A (en) | Improvements in thermally operated electric switches |