GB527161A - Improvements in and relating to machine-operated electric switches particularly limit switches - Google Patents
Improvements in and relating to machine-operated electric switches particularly limit switchesInfo
- Publication number
- GB527161A GB527161A GB10231/39A GB1023139A GB527161A GB 527161 A GB527161 A GB 527161A GB 10231/39 A GB10231/39 A GB 10231/39A GB 1023139 A GB1023139 A GB 1023139A GB 527161 A GB527161 A GB 527161A
- Authority
- GB
- United Kingdom
- Prior art keywords
- arm
- dead
- held
- centre
- magnet
- 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
- H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
- H01H21/02—Details
- H01H21/18—Movable parts; Contacts mounted thereon
- H01H21/22—Operating parts, e.g. handle
- H01H21/24—Operating parts, e.g. handle biased to return to normal position upon removal of operating force
- H01H21/28—Operating parts, e.g. handle biased to return to normal position upon removal of operating force 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
Landscapes
- Push-Button Switches (AREA)
Abstract
527,161. Snap-action switches. BRITISH THOMSON-HOUSTON CO., Ltd. April 1, 1939, No. 10231. Convention date, April 1, 1938. [Class 38 (v)] In a limit switch, movement of a machine member 59, Fig. 7, operates a double-armed cam member 61 with a snapaction from the full to the dotted line position, or vice versa, the member 61 being connected through a dead-centre and transmission spring mechanism to a contact arm which is held in either of its two positions by a permanent magnet. The member 61 is fixed to a shaft 46 which carries a member 49 influenced by the dead-centre spring 57. As the member 49 is rotated in a clockwise direction an arm 49<1> on it moves into engagement with the right hand end of the spiral transmission spring 58, the left hand end of which then bears with increasing tension against a lug 52 on a two-armed member 29, 30, the arm 30 of which is held magnetically to a permanent magnet 26. With further rotation the member 49 passes its dead centre position and one of its two arms 50, 51 positively engages the lug 52 to force it away from the magnet. This action is a push rather than a blow since the springs 57, 58 here act in opposition. The member 29, 30, carrying with it the contact member, not shown, now moves rapidly into its other position where the arm 29 is held by the magnet 26. Specification 423,897, (Group II], is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US527161XA | 1938-04-01 | 1938-04-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB527161A true GB527161A (en) | 1940-10-03 |
Family
ID=21979443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB10231/39A Expired GB527161A (en) | 1938-04-01 | 1939-04-01 | Improvements in and relating to machine-operated electric switches particularly limit switches |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB527161A (en) |
-
1939
- 1939-04-01 GB GB10231/39A patent/GB527161A/en not_active Expired
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