GB533293A - Improvements relating to switch operating gear for electric machinery for use in mines and other places where there is dust, for example electric coal and stone drills - Google Patents
Improvements relating to switch operating gear for electric machinery for use in mines and other places where there is dust, for example electric coal and stone drillsInfo
- Publication number
- GB533293A GB533293A GB2289639A GB2289639A GB533293A GB 533293 A GB533293 A GB 533293A GB 2289639 A GB2289639 A GB 2289639A GB 2289639 A GB2289639 A GB 2289639A GB 533293 A GB533293 A GB 533293A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mines
- dust
- places
- switch operating
- improvements relating
- 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
- H01H51/00—Electromagnetic relays
- H01H51/28—Relays having both armature and contacts within a sealed casing outside which the operating coil is located, e.g. contact carried by a magnetic leaf spring or reed
- H01H51/287—Details of the shape of the contact springs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
- H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
- H01H9/042—Explosion-proof cases
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
533,293. Hand actuating devices for switches. BRITISH ENGINES, Ltd., and LAMB, H. T. Aug. 8, 1939, No. 22896. [Class 38 (v)] The operating member 7 of a switch for an electric drill &c. is mounted in a tube 5 enclosed in rubber or like material which is pressed, e.g. by a lever 14, when it is desired to actuate the switch. The Figure shows a usual type of drill with two handles 2 and the member 7 is mounted in the tube 5 in one of these handles .and bears on a rod 9 engaging the switch 10. The rubber sheath fits closely round the tube 5.at the left and has a hollowed out more flexible portion 12. on the right.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2289639A GB533293A (en) | 1939-08-08 | 1939-08-08 | Improvements relating to switch operating gear for electric machinery for use in mines and other places where there is dust, for example electric coal and stone drills |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2289639A GB533293A (en) | 1939-08-08 | 1939-08-08 | Improvements relating to switch operating gear for electric machinery for use in mines and other places where there is dust, for example electric coal and stone drills |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB533293A true GB533293A (en) | 1941-02-11 |
Family
ID=10186802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2289639A Expired GB533293A (en) | 1939-08-08 | 1939-08-08 | Improvements relating to switch operating gear for electric machinery for use in mines and other places where there is dust, for example electric coal and stone drills |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB533293A (en) |
-
1939
- 1939-08-08 GB GB2289639A patent/GB533293A/en not_active Expired
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