GB310729A - An adjustable prop for use in mines and the like - Google Patents
An adjustable prop for use in mines and the likeInfo
- Publication number
- GB310729A GB310729A GB2294828A GB2294828A GB310729A GB 310729 A GB310729 A GB 310729A GB 2294828 A GB2294828 A GB 2294828A GB 2294828 A GB2294828 A GB 2294828A GB 310729 A GB310729 A GB 310729A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cylinder
- prop
- piston
- chain
- debris
- 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
- 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)
- Earth Drilling (AREA)
Abstract
310,729. Phillips, C. W., and Williamson, H. Aug. 9, 1928. Mine props.-A pit prop of the type having a plunger 4 resting on debris in a cylinder 2 supported by the lower part of the prop has lateral openings 9 in the cylinder through which passes a chain or the like 10 which, on being pulled, removes part of the debris from the cylinder and allows the prop to collapse. The last links of the chain are shaped to engage the outside surfaces of the lateral apertures, so that continued pulling on the chain will remove the prop. The piston has a pin-and-slot connection with the cylinder and the cylinder may be filled through a hollow in the piston or through an aperture 8<b> in the cylinder wall which is subsequently closed by the piston. The lower supporting prop member may be a section bar or a tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2294828A GB310729A (en) | 1928-08-09 | 1928-08-09 | An adjustable prop for use in mines and the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2294828A GB310729A (en) | 1928-08-09 | 1928-08-09 | An adjustable prop for use in mines and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB310729A true GB310729A (en) | 1929-05-02 |
Family
ID=10187646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2294828A Expired GB310729A (en) | 1928-08-09 | 1928-08-09 | An adjustable prop for use in mines and the like |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB310729A (en) |
-
1928
- 1928-08-09 GB GB2294828A patent/GB310729A/en not_active Expired
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