GB849945A - Improvements in magnetically-controlled electric switching apparatus - Google Patents
Improvements in magnetically-controlled electric switching apparatusInfo
- Publication number
- GB849945A GB849945A GB413958A GB413958A GB849945A GB 849945 A GB849945 A GB 849945A GB 413958 A GB413958 A GB 413958A GB 413958 A GB413958 A GB 413958A GB 849945 A GB849945 A GB 849945A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnet
- door
- carries
- switch
- magnets
- 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
- H01H29/02—Details
- H01H29/14—Operating mechanisms adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
Abstract
849,945. Magnetic switches. AUTO CALL CO. Ltd. Feb. 4, 1959 [Feb. 7, 1958], No. 4139/58. Class 38 (5). In a magnetic switching device, which may be used in a burglar alarm, a biased contact actuating magnet mounted in one member is normally repelled against its bias by a magnet in another member, and relative movement between the member separates the magnets to permit contact operation. As shown, a plate 7 closes a cavity 6 in the lintel 2 of a swing door 1 and carries a bracket 8 pivotally supporting an arm 9. The latter carries a mercury switch 14 at one end and a permanent magnet 11 at the other, the weight of the magnet biasing the arm 9 to the dotted position in which the switch is open. The door carries a second permanent 3 which when the door is closed repels the magnet 11 to maintain the switch contacts closed. The magnets are both polarised in the direction of movement of the door so that the magnet 11 is attracted after the magnet 3 has moved a small amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB413958A GB849945A (en) | 1958-02-07 | 1958-02-07 | Improvements in magnetically-controlled electric switching apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB413958A GB849945A (en) | 1958-02-07 | 1958-02-07 | Improvements in magnetically-controlled electric switching apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB849945A true GB849945A (en) | 1960-09-28 |
Family
ID=9771502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB413958A Expired GB849945A (en) | 1958-02-07 | 1958-02-07 | Improvements in magnetically-controlled electric switching apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB849945A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3161742A (en) * | 1961-08-24 | 1964-12-15 | Specialties Dev Corp | Magnetic intruder and fire deterctor |
| CN114390820A (en) * | 2021-12-10 | 2022-04-22 | 华能澜沧江水电股份有限公司 | Power station wisdom emergency rescue station |
-
1958
- 1958-02-07 GB GB413958A patent/GB849945A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3161742A (en) * | 1961-08-24 | 1964-12-15 | Specialties Dev Corp | Magnetic intruder and fire deterctor |
| CN114390820A (en) * | 2021-12-10 | 2022-04-22 | 华能澜沧江水电股份有限公司 | Power station wisdom emergency rescue station |
| CN114390820B (en) * | 2021-12-10 | 2024-04-02 | 华能澜沧江水电股份有限公司 | Hydropower station wisdom emergency rescue station |
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