GB868073A - Improvements in or relating to hydraulic pit props - Google Patents
Improvements in or relating to hydraulic pit propsInfo
- Publication number
- GB868073A GB868073A GB1636157A GB1636157A GB868073A GB 868073 A GB868073 A GB 868073A GB 1636157 A GB1636157 A GB 1636157A GB 1636157 A GB1636157 A GB 1636157A GB 868073 A GB868073 A GB 868073A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- pressure
- chamber
- rod
- valve member
- 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
- 230000000630 rising 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
- E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/10—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with auxiliary valve for fluid operation of the main valve
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Safety Valves (AREA)
- Check Valves (AREA)
Abstract
868,073. Fluid-actuated valves. BECORITGRUBENAUSBAU G.m.b.H. May 23, 1957 [June 25, 1956], No. 16361/57. Class 135. [Also in Group X] A pressure-relief valve in an hydraulic pit prop including telescopic outer and inner tubes 1, 2, Fig. 1, constituting a pressure chamber 3 and reservoir 5 respectively and an interconnecting tube 6 over which a piston 4 connected to the inner tube slides, comprises a valve member 15, Fig. 3, continuously urged towards closure by the pressure in the chamber 3 and displaceable out of and into closed position by a valve-operating member comprising a leaky piston 22 and a rod 21 and an hydraulic intensifier. The hydraulic intensifier comprises a liquidfilled branch 26 connected to a space 24 between the rod 21 and a piston 25 of much larger area than the rod 21 having an extension 28 engaging the valve member 15. The leaky piston 22 is subjected on both sides to the pressure in the chamber 3 and loaded by a spring 23. On the pressure in the chamber 3 rising to a valve whereby the differential pressure acting on the opposite sides of the piston 22 overcomes the spring 23 the piston and rod 21 move rightwardly. The force overcoming the spring by virtue of the difference in areas of the rod 21 and piston 25 is increased and acts on the piston 25 and the valve member 15. The valve member 15 will, however, remain seated, since it is larger in diameter than the rod 21, until the pressure in the chamber 3 has risen to a still higher value at which the chamber pressure acting on the valve member 15 is overcome by the resulting increased pressure acting on the piston 25. The valve member 15 then opens to relieve pressure from the chamber 3 to the reservoir 5 through passages 13, 13a and 14, extension 28 of the piston 25 and the tube 6. The branch 26 is closed by an adjustable plug 27 to vary the volume of the intensifier, hence the loading on the spring 23 and consequently the operating pressure of the valve.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB40795A DE1081397B (en) | 1956-06-25 | 1956-06-25 | Hydraulic pit ram |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB868073A true GB868073A (en) | 1961-05-17 |
Family
ID=6966190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1636157A Expired GB868073A (en) | 1956-06-25 | 1957-05-23 | Improvements in or relating to hydraulic pit props |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1081397B (en) |
| FR (1) | FR1177929A (en) |
| GB (1) | GB868073A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2941168A1 (en) * | 1979-10-11 | 1981-04-23 | Thyssen Industrie Ag, 4300 Essen | Mine hydraulic thrust piston gear - has differential piston ring chamber gas filled for even telescopic step force distribution |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE526791A (en) * | 1953-02-25 | |||
| DE943825C (en) * | 1954-12-31 | 1956-06-01 | Gutehoffnungshuette Sterkrade | Hydraulic pit ram |
-
1956
- 1956-06-25 DE DEB40795A patent/DE1081397B/en active Pending
-
1957
- 1957-05-23 GB GB1636157A patent/GB868073A/en not_active Expired
- 1957-06-24 FR FR1177929D patent/FR1177929A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1081397B (en) | 1960-05-12 |
| FR1177929A (en) | 1959-04-30 |
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