GB523674A - Improvements in or relating to means for preventing sparking in electric switches - Google Patents
Improvements in or relating to means for preventing sparking in electric switchesInfo
- Publication number
- GB523674A GB523674A GB97039A GB97039A GB523674A GB 523674 A GB523674 A GB 523674A GB 97039 A GB97039 A GB 97039A GB 97039 A GB97039 A GB 97039A GB 523674 A GB523674 A GB 523674A
- Authority
- GB
- United Kingdom
- Prior art keywords
- contact
- mercury
- engagement
- fixed
- switch
- 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
- H01H29/00—Switches having at least one liquid contact
- H01H29/16—Switches having at least one liquid contact operated by dipping soil contact into stationary contact liquid
Landscapes
- Breakers (AREA)
Abstract
523,674. Arc rupturing in switches. AROV ELECTRICITY METER, Ltd., and RIORDAN, E. J. Jan. 11, 1939, No. 970. [Class 38 (v)] In a switch particularly for prepayment meters adapted to take a current of say 25 amperes or more, ciruit is first made and last broken at spark-taking metal contacts 19a, 22a of say tungsten which are arranged in parallel with the main switch which comprises a fixed contact 4 in permanent engagement with a body of mercury 5 and a movable contact 3 adapted to be lowered into the mercury until it eventually engages the contact 4. To open the switch, an operating shaft, not shown, causes the raising of a member 16 fixed to the contact 3 till this is clear of the mercury. The member 16 then engages the head of a screw 21 fixed to the contact 19a and raises this out of engagement with the contact 22a. The circuit to the contact 22a is through a strip 23 and a fusible nut 24. Should the contacts therefore overheat, the nut melts and the strip 23 moves into engagement with an insulating lip 25.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB97039A GB523674A (en) | 1939-01-11 | 1939-01-11 | Improvements in or relating to means for preventing sparking in electric switches |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB97039A GB523674A (en) | 1939-01-11 | 1939-01-11 | Improvements in or relating to means for preventing sparking in electric switches |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB523674A true GB523674A (en) | 1940-07-19 |
Family
ID=9713720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB97039A Expired GB523674A (en) | 1939-01-11 | 1939-01-11 | Improvements in or relating to means for preventing sparking in electric switches |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB523674A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3174019A (en) * | 1962-01-09 | 1965-03-16 | Allis Chalmers Mfg Co | Vacuum tube interrupter having sequential separable contacts |
| US3566750A (en) * | 1969-03-10 | 1971-03-02 | Foxboro Co | Differential pressure cell with keystone structure |
| US3646294A (en) * | 1970-12-31 | 1972-02-29 | Itt | Switch |
| US4727229A (en) * | 1985-01-28 | 1988-02-23 | Hodkin George A | Interrupter isolator |
-
1939
- 1939-01-11 GB GB97039A patent/GB523674A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3174019A (en) * | 1962-01-09 | 1965-03-16 | Allis Chalmers Mfg Co | Vacuum tube interrupter having sequential separable contacts |
| US3566750A (en) * | 1969-03-10 | 1971-03-02 | Foxboro Co | Differential pressure cell with keystone structure |
| US3646294A (en) * | 1970-12-31 | 1972-02-29 | Itt | Switch |
| US4727229A (en) * | 1985-01-28 | 1988-02-23 | Hodkin George A | Interrupter isolator |
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