GB882246A - Improvements in and relating to props - Google Patents
Improvements in and relating to propsInfo
- Publication number
- GB882246A GB882246A GB947557A GB947557A GB882246A GB 882246 A GB882246 A GB 882246A GB 947557 A GB947557 A GB 947557A GB 947557 A GB947557 A GB 947557A GB 882246 A GB882246 A GB 882246A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- reservoir
- past
- piston
- ram
- 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
- 239000012530 fluid Substances 0.000 abstract 3
- 239000007788 liquid Substances 0.000 abstract 3
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
- E21D15/50—Component parts or details of props
- E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
- E21D15/512—Arrangement of valves
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)
- Reciprocating Pumps (AREA)
Abstract
882,246. Hydraulic pit props. ACROW (ENGINEERS) Ltd. March 21, 1958 [March 22, 1957], No. 9475/57. Class 20(2) In an hydraulic telescopic pit prop comprising a pump adapted to transfer liquid from a reservoir 63 in the ram 12 past a valve 46 to the prop pressure chamber 44, the valve 46 is adapted to be opened manually, to release liquid from the chamber 44 to the reservoir 63 to release the prop, by a rod 26 extending through the ram and having a valve 42 which prevents liquid leaking past the valve 46 when closed and escaping to the reservoir. The prop is adapted to be extended rapidly by a low pressure pump piston 32 operated by a lever 19 and when under load by a high pressure pump piston 22, and also comprises a pressure relief valve 48. The rod 26 is operated by a lever 56 at the upper end of the ram and the released fluid flows to the reservoir 63 past the release rod 26 and lubricates it. The low pressure piston 32 fits inside the ram 12 and draws fluid from the reservoir 63 through a passage 51 between itself and the high pressure piston by means of which it is moved and forces the fluid past a valve 50 through the pressure chamber of the high pressure piston and past the valve 46 to the chamber 44. A valve 34 in the piston 32 yields and renders it inoperative at a predetermined pressure. The lever 56 operates, by a cam 54, a plunger 52 having a cam 58 engaging the top of the rod 26.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB947557A GB882246A (en) | 1957-03-22 | 1957-03-22 | Improvements in and relating to props |
FR1193513D FR1193513A (en) | 1957-03-22 | 1958-03-21 | prop |
BE596046A BE596046Q (en) | 1957-03-22 | 1960-10-14 | Let's prop up. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB947557A GB882246A (en) | 1957-03-22 | 1957-03-22 | Improvements in and relating to props |
Publications (1)
Publication Number | Publication Date |
---|---|
GB882246A true GB882246A (en) | 1961-11-15 |
Family
ID=9872682
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB947557A Expired GB882246A (en) | 1957-03-22 | 1957-03-22 | Improvements in and relating to props |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE596046Q (en) |
FR (1) | FR1193513A (en) |
GB (1) | GB882246A (en) |
-
1957
- 1957-03-22 GB GB947557A patent/GB882246A/en not_active Expired
-
1958
- 1958-03-21 FR FR1193513D patent/FR1193513A/en not_active Expired
-
1960
- 1960-10-14 BE BE596046A patent/BE596046Q/en active
Also Published As
Publication number | Publication date |
---|---|
BE596046Q (en) | 1961-04-14 |
FR1193513A (en) | 1959-11-03 |
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