GB502900A - Improvements in or relating to liquid actuated treadle electric switches - Google Patents
Improvements in or relating to liquid actuated treadle electric switchesInfo
- Publication number
- GB502900A GB502900A GB2312337A GB2312337A GB502900A GB 502900 A GB502900 A GB 502900A GB 2312337 A GB2312337 A GB 2312337A GB 2312337 A GB2312337 A GB 2312337A GB 502900 A GB502900 A GB 502900A
- Authority
- GB
- United Kingdom
- Prior art keywords
- contacts
- float
- liquid
- float chamber
- mercury
- 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
- H01H35/00—Switches operated by change of a physical condition
- H01H35/18—Switches operated by change of liquid level or of liquid density, e.g. float switch
Landscapes
- Control Of Non-Electrical Variables (AREA)
Abstract
502,900. Actuation of switches. SIEMENS & GENERAL ELECTRIC RAILWAY SIGNAL CO., Ltd., CANDLER, J. E., and HOPKINS, R. W. Aug. 23, 1937, No. 23123. [Class 38 (v)] A switch is operated by the passage of a vehicle over a treadle which ejects liquid from a reservoir into a float chamber and produces movement of a float to operate contacts. The float chamber is enclosed by a flexible diaphragm which separates the contacts from the liquid and prevents the escape of liquid during transport. Mercury is forced past a ball valve 4 into a float chamber 3 where it lifts the float 2 which moves a contact carrier 8 to which it is joined by a rod passing through a flexible diaphragm 6. Contacts 7 on flexible arms 13 move between fixed contacts 14 attached to a terminal board 10 to terminals 11 on which the moving contacts 7 are connected by conducting springs 12 2 which serve to guide the float 2. The mercury can return to the reservoir through a small hole in cup 3 and a ball valve 5 after the vehicle has passed. Specification 237,473, [Class 38 (v)], is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2312337A GB502900A (en) | 1937-08-23 | 1937-08-23 | Improvements in or relating to liquid actuated treadle electric switches |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2312337A GB502900A (en) | 1937-08-23 | 1937-08-23 | Improvements in or relating to liquid actuated treadle electric switches |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB502900A true GB502900A (en) | 1939-03-23 |
Family
ID=10190477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2312337A Expired GB502900A (en) | 1937-08-23 | 1937-08-23 | Improvements in or relating to liquid actuated treadle electric switches |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB502900A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3091085A (en) * | 1960-11-29 | 1963-05-28 | James W Honodel | Hydraulically actuated controller |
| WO2006040564A1 (en) | 2004-10-14 | 2006-04-20 | Forensic Science Service Ltd. | Feature extraction and comparison in finger- and palmprint recognition |
-
1937
- 1937-08-23 GB GB2312337A patent/GB502900A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3091085A (en) * | 1960-11-29 | 1963-05-28 | James W Honodel | Hydraulically actuated controller |
| WO2006040564A1 (en) | 2004-10-14 | 2006-04-20 | Forensic Science Service Ltd. | Feature extraction and comparison in finger- and palmprint recognition |
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