GB911588A - Improvements in or relating to hydropneumatic pit props - Google Patents
Improvements in or relating to hydropneumatic pit propsInfo
- Publication number
- GB911588A GB911588A GB41005/60A GB4100560A GB911588A GB 911588 A GB911588 A GB 911588A GB 41005/60 A GB41005/60 A GB 41005/60A GB 4100560 A GB4100560 A GB 4100560A GB 911588 A GB911588 A GB 911588A
- Authority
- GB
- United Kingdom
- Prior art keywords
- intermediate member
- piston
- hydro
- bell
- pneumatic
- 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
- 239000007788 liquid Substances 0.000 abstract 2
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)
- Safety Valves (AREA)
- Actuator (AREA)
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
Abstract
911,588. Hydro-pneumatic pit props. NIKEX NEHEZIPARI KULKERESKEDELMI VALLALAT. Nov. 29, 1960, No. 41005/60. Class 20 (2). A hydro-pneumatic pit prop comprises a base 1 for liquid, a working cylinder 4 connected thereto by an intermediate member 3 and an inner tubular member, see Fig. 1 (not shown) which is slidable in said cylinder and carries a head plate and a bell-shaped rubber piston, said intermediate member having ports 12, 15 for establishing communication between the bell-shaped piston and a conduit 13 carried by the intermediate member and extending into the base. A normally operable control valve 16-21 incorporating automatic safety relief means is mounted in the intermediate member 3 and is adapted to be connected to a source of compressed air to feed liquid from the bore 1 through the ports 12, 15 to the underside of the piston until the prop head engages the main roof at the desired pressure whereupon the pressure hose is disconnected and a closure cap fitted.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR844673A FR1280693A (en) | 1960-11-29 | 1960-11-22 | hydropneumatic mine prop |
| GB41005/60A GB911588A (en) | 1960-11-29 | 1960-11-29 | Improvements in or relating to hydropneumatic pit props |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB41005/60A GB911588A (en) | 1960-11-29 | 1960-11-29 | Improvements in or relating to hydropneumatic pit props |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB911588A true GB911588A (en) | 1962-11-28 |
Family
ID=10417654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB41005/60A Expired GB911588A (en) | 1960-11-29 | 1960-11-29 | Improvements in or relating to hydropneumatic pit props |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR1280693A (en) |
| GB (1) | GB911588A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2300894A1 (en) * | 1975-02-12 | 1976-09-10 | Bennes Marrel | Shock absorber for sledge mounted mine roof support - is membrane pressure accumulator housed inside piston of actuator strut |
-
1960
- 1960-11-22 FR FR844673A patent/FR1280693A/en not_active Expired
- 1960-11-29 GB GB41005/60A patent/GB911588A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1280693A (en) | 1962-01-08 |
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