GB778715A - Improvements in or relating to hydraulic pit props and the like - Google Patents
Improvements in or relating to hydraulic pit props and the likeInfo
- Publication number
- GB778715A GB778715A GB1667553A GB1667553A GB778715A GB 778715 A GB778715 A GB 778715A GB 1667553 A GB1667553 A GB 1667553A GB 1667553 A GB1667553 A GB 1667553A GB 778715 A GB778715 A GB 778715A
- Authority
- GB
- United Kingdom
- Prior art keywords
- prop
- valve
- ball
- pressure
- spring
- 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
- 230000004048 modification Effects 0.000 abstract 2
- 238000012986 modification Methods 0.000 abstract 2
- 239000007788 liquid 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
- E21D15/50—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)
- Fluid-Pressure Circuits (AREA)
- Actuator (AREA)
Abstract
778,715. Hydraulic jacks. GULLICK, Ltd., and SEAMAN, T. June 17, 1954 [June 17, 1953], No. 16675/53. Class 78 (3). [Also in Groups X and XXIX] A relief valve for an hydraulic jack, e.g. a pit prop, comprises a loose ball valve 17, Fig. 1, subjected in the valve closing direction to the pressure within the prop 11 transmitted through a duct 23 assisted by a spring 21 and in the valve opening direction to the pressure within the prop acting on a diaphragm 14 of larger effective area than that of the ball 17. In a modification, the diaphragm is replaced by a piston loaded by a spring against internal prop pressure, the ball in this case being loaded by a very light spring. In a further modification, in which pressure liquid is supplied to the prop through an inlet nozzle 31, Fig. 3, ducts 32, 32a, 32b and a manually-operable valve 33, the ball is replaced by a valve member 39 acted upon by the loosely fitting stem 45 of a piston 45a of larger area than the valve member 39. Specification 720,361 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1667553A GB778715A (en) | 1953-06-17 | 1953-06-17 | Improvements in or relating to hydraulic pit props and the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1667553A GB778715A (en) | 1953-06-17 | 1953-06-17 | Improvements in or relating to hydraulic pit props and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB778715A true GB778715A (en) | 1957-07-10 |
Family
ID=10081610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1667553A Expired GB778715A (en) | 1953-06-17 | 1953-06-17 | Improvements in or relating to hydraulic pit props and the like |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB778715A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4142449A (en) * | 1976-02-03 | 1979-03-06 | Thyssen Industrie Ag | Hydraulic mine prop |
| CN113482667A (en) * | 2021-08-19 | 2021-10-08 | 重庆交通大学 | Tunnel steel frame connecting device adapting to two-way deformation |
-
1953
- 1953-06-17 GB GB1667553A patent/GB778715A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4142449A (en) * | 1976-02-03 | 1979-03-06 | Thyssen Industrie Ag | Hydraulic mine prop |
| CN113482667A (en) * | 2021-08-19 | 2021-10-08 | 重庆交通大学 | Tunnel steel frame connecting device adapting to two-way deformation |
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