GB313899A - A steel pit prop - Google Patents
A steel pit propInfo
- Publication number
- GB313899A GB313899A GB824928A GB824928A GB313899A GB 313899 A GB313899 A GB 313899A GB 824928 A GB824928 A GB 824928A GB 824928 A GB824928 A GB 824928A GB 313899 A GB313899 A GB 313899A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wood
- chamber
- lbs
- crushing
- enclosing
- 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 1
- 239000010959 steel Substances 0.000 title 1
- 239000002023 wood Substances 0.000 abstract 3
- 230000000284 resting effect Effects 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)
- Carbon And Carbon Compounds (AREA)
Abstract
313,899. Carey, J. M., and Illingworth, S. R. March 19, 1928. Mine props. - A mine prop is formed of a tube a enclosing an upstanding rod d and an upper sliding piston-member f resting on a block of wood w or other crushable medium of less diameter than the enclosing chamber. By this arrangement, two separate yieldings are obtained under load, as shown in Fig. 5, the first due to the crushing of the block to fill the confining chamber at 35,000 lbs. pressure, and the second due to the crushing of the fibres of the wood in the chamber to 75,000 lbs. pressure, the total yield being about 2 ins. The rods may be hollow with bearing plates k interposed between them and the wood,
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB824928A GB313899A (en) | 1928-03-19 | 1928-03-19 | A steel pit prop |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB824928A GB313899A (en) | 1928-03-19 | 1928-03-19 | A steel pit prop |
Publications (1)
Publication Number | Publication Date |
---|---|
GB313899A true GB313899A (en) | 1929-06-19 |
Family
ID=9848866
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB824928A Expired GB313899A (en) | 1928-03-19 | 1928-03-19 | A steel pit prop |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB313899A (en) |
-
1928
- 1928-03-19 GB GB824928A patent/GB313899A/en not_active Expired
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