GB353617A - Improvements in or relating to metallic pit props - Google Patents
Improvements in or relating to metallic pit propsInfo
- Publication number
- GB353617A GB353617A GB1736630A GB1736630A GB353617A GB 353617 A GB353617 A GB 353617A GB 1736630 A GB1736630 A GB 1736630A GB 1736630 A GB1736630 A GB 1736630A GB 353617 A GB353617 A GB 353617A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lever
- lower prop
- prop
- sliding member
- 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
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/02—Non-telescopic props
- E21D15/06—Non-telescopic props with parts joined by a lock, with or without slight axial adjustability
- E21D15/12—Non-telescopic props with parts joined by a lock, with or without slight axial adjustability with locking devices located near head or foot
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Bridges Or Land Bridges (AREA)
- Walking Sticks, Umbrellas, And Fans (AREA)
Abstract
353,617. Mine props. WHITEHOUSE, R. H., The Gables, Walsall Road, Church Bridge, near Cannock, Staffordshire. June 5, 1930, No. 17366. [Class 20 (ii).] Collapsable mine props, of the type comprising an upper sliding member mounted in a socket portion at the head of a lower prop member, has the sliding member actuated and supported by a lever 7 mounted in a transverse slot in the lower prop member, the lever being provided with a cam-shaped portion 7a to contact with the sliding member 9 of the prop. A locking sleeve 8 of frusto-conical shape is adapted to slide on the lower prop member to lock the lever in actuating position, the conical portion of the sleeve contacting with a corresponding portion on the lower prop member. In a modification, no locking sleeve is used, and the lever is longer and provided with an apertured end whereby a hauling rope may be attached for releasing the prop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1736630A GB353617A (en) | 1930-06-05 | 1930-06-05 | Improvements in or relating to metallic pit props |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1736630A GB353617A (en) | 1930-06-05 | 1930-06-05 | Improvements in or relating to metallic pit props |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB353617A true GB353617A (en) | 1931-07-30 |
Family
ID=10093933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1736630A Expired GB353617A (en) | 1930-06-05 | 1930-06-05 | Improvements in or relating to metallic pit props |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB353617A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3015077A (en) * | 1958-05-15 | 1961-12-26 | Electro Products Lab Inc | Electrical sensing circuit |
-
1930
- 1930-06-05 GB GB1736630A patent/GB353617A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3015077A (en) * | 1958-05-15 | 1961-12-26 | Electro Products Lab Inc | Electrical sensing circuit |
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