GB381795A - An improved tubular steel pit prop - Google Patents
An improved tubular steel pit propInfo
- Publication number
- GB381795A GB381795A GB36832A GB36832A GB381795A GB 381795 A GB381795 A GB 381795A GB 36832 A GB36832 A GB 36832A GB 36832 A GB36832 A GB 36832A GB 381795 A GB381795 A GB 381795A
- Authority
- GB
- United Kingdom
- Prior art keywords
- prop
- tube
- wedge
- pit
- disc
- 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
- 229910000831 Steel Inorganic materials 0.000 title abstract 3
- 239000010959 steel Substances 0.000 title abstract 3
- 239000003245 coal Substances 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000002023 wood Substances 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
- E21D15/14—Telescopic props
- E21D15/16—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure
- E21D15/18—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure with one part resting on a supporting medium, e.g. rubber, sand, bitumen, lead, located in the other part, with or without expulsion or displacement of the medium upon excessive pressure
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)
- Supports For Pipes And Cables (AREA)
Abstract
381,795. Pit props. BARKER, R. E., Aysgarth, Warren Avenue, Knottingley, Yorkshire. Jan. 6, 1932, No. 368. [Class 20 (ii).] A tubular steel pit prop c, is reinforced by steel strips l which are arranged longitudinally in the tube and are interspaced by a lighter material such as wood w. The strips extend from an upper wedge-shaped disc d to a plug b secured to the base of the tube. The tube is cut away at e to accommodate the disc d and a wedge k engaging therewith. The upper edge of this wedge engages with a vertically movable head a which fits into the upper end of the prop and extends between the disc d and the roof of the pit. The overall length of the prop can thus be adjusted by altering the position of the wedge, the increased or decreased compressional stresses thus produced being taken by the strips l. The lower end of the prop fits into a tube f having an aperture g through which loose coal can be introduced, when the two tubes c, f are extended, to vary the overall length of the prop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB36832A GB381795A (en) | 1932-01-06 | 1932-01-06 | An improved tubular steel pit prop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB36832A GB381795A (en) | 1932-01-06 | 1932-01-06 | An improved tubular steel pit prop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB381795A true GB381795A (en) | 1932-10-13 |
Family
ID=9703171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB36832A Expired GB381795A (en) | 1932-01-06 | 1932-01-06 | An improved tubular steel pit prop |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB381795A (en) |
-
1932
- 1932-01-06 GB GB36832A patent/GB381795A/en not_active Expired
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