GB1045302A - Hydraulically operated roof supports - Google Patents
Hydraulically operated roof supportsInfo
- Publication number
- GB1045302A GB1045302A GB1014463A GB1014463A GB1045302A GB 1045302 A GB1045302 A GB 1045302A GB 1014463 A GB1014463 A GB 1014463A GB 1014463 A GB1014463 A GB 1014463A GB 1045302 A GB1045302 A GB 1045302A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chamber
- piston
- prop
- valve
- fluid
- 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 6
- 230000004048 modification Effects 0.000 abstract 2
- 238000012986 modification Methods 0.000 abstract 2
- 210000004907 gland Anatomy 0.000 abstract 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type
-
- 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
- E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
1,045,302. Hydraulic pit props. ELECTROHYDRAULICS Ltd. March 13, 1964 [March 14, 1963], No. 10144/63. Heading E1E. An hydraulic pit prop having two or more telescopic stages controlled by a single relief valve (not shown) comprises an inner piston 22 moving in the hollow piston rod 6 of an outer piston 7, there being two cylindrical chambers A, C and two annular chambers B, D. A pair of valves 43, 44 inter-connecting the opposite side of the piston 22 are closed by a common spring 45, the valve 44 being opened by a plunger 46. Before use the chambers B, C, D and the space E are filled via connection 30 with fluid under sufficient pressure to hold piston 22 slightly raised and hence valve 44 closed, air being exhausted through subsquently-closed passages 33, 17. Connection 30 is then connected to tank and to raise the prop fluid pressure is applied through a relief valve (not shown) and inlet 4 to chamber A. As piston 7 rises it displaces fluid from the annular chamber B through a hole 13 into the cylindrical chamber C, thus raising piston 22 and expelling fluid from chamber D through bores 48, 50 into chamber E, and from chamber E through connection 30 to tank. Yielding of the prop under load is thus determined by a relief valve controlling the constantdiameter chamber A. The prop is retracted by releasing fluid pressure from chamber A and applying fluid pressure to the chambers B, D through connection 30. As piston 22 completes its retraction stroke the valve 44 is opened and allows any fluid losses to be made good through valve 43. In a modification the space E is replaced by conduits between the passages 30, 50, 33. In a further modification an inlet to chamber D is provided in the gland 28. If desired the connections 4, 30, may be both at the same end of the prop, telescopic pipes being passed through the pistons.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1014463A GB1045302A (en) | 1963-03-14 | 1963-03-14 | Hydraulically operated roof supports |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1014463A GB1045302A (en) | 1963-03-14 | 1963-03-14 | Hydraulically operated roof supports |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1045302A true GB1045302A (en) | 1966-10-12 |
Family
ID=9962318
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1014463A Expired GB1045302A (en) | 1963-03-14 | 1963-03-14 | Hydraulically operated roof supports |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1045302A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2518640A1 (en) * | 1981-12-21 | 1983-06-24 | Gewerk Eisenhuette Westfalia | TELESCOPIC HYDRAULIC ETANCON, ESPECIALLY FOR UNDERGROUND MARCHING SUPPORT, AND ESPECIALLY FOR SUPPORTING SCAFFOLDER |
FR2617915A1 (en) * | 1987-07-10 | 1989-01-13 | Pagliero O P Spa | MULTI-STAGE HYDRAULIC CYLINDER WITH SIMULTANEOUS TELESCOPIC OPERATION |
DE19647943C1 (en) * | 1996-11-20 | 1998-06-18 | Dbt Gmbh | Hydraulic double telescopic stamp |
CN113175342A (en) * | 2021-04-15 | 2021-07-27 | 中煤科工开采研究院有限公司 | Shock-resistant double-telescopic upright post |
-
1963
- 1963-03-14 GB GB1014463A patent/GB1045302A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2518640A1 (en) * | 1981-12-21 | 1983-06-24 | Gewerk Eisenhuette Westfalia | TELESCOPIC HYDRAULIC ETANCON, ESPECIALLY FOR UNDERGROUND MARCHING SUPPORT, AND ESPECIALLY FOR SUPPORTING SCAFFOLDER |
FR2617915A1 (en) * | 1987-07-10 | 1989-01-13 | Pagliero O P Spa | MULTI-STAGE HYDRAULIC CYLINDER WITH SIMULTANEOUS TELESCOPIC OPERATION |
GB2206929A (en) * | 1987-07-10 | 1989-01-18 | Op Pagliero S P A | Improvements in or relating to hydraulically operated telescopic devices |
DE19647943C1 (en) * | 1996-11-20 | 1998-06-18 | Dbt Gmbh | Hydraulic double telescopic stamp |
CN113175342A (en) * | 2021-04-15 | 2021-07-27 | 中煤科工开采研究院有限公司 | Shock-resistant double-telescopic upright post |
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