GB1120896A - Improvements in or relating to hydraulic pit props - Google Patents
Improvements in or relating to hydraulic pit propsInfo
- Publication number
- GB1120896A GB1120896A GB2894966A GB2894966A GB1120896A GB 1120896 A GB1120896 A GB 1120896A GB 2894966 A GB2894966 A GB 2894966A GB 2894966 A GB2894966 A GB 2894966A GB 1120896 A GB1120896 A GB 1120896A
- Authority
- GB
- United Kingdom
- Prior art keywords
- prop
- valve
- relating
- throttle means
- line
- 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
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
-
- 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
- E21D15/60—Devices for withdrawing props or chocks
- E21D15/603—Devices for withdrawing props or chocks by means of hydraulic devices
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Press Drives And Press Lines (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
1,120,896. Hydraulic mine roof supports. GEWERKSCHAFT EISENHUTTE WESTFALIA. June 28, 1966 [July 1, 1965], No.28949/66. Heading F1P. Retraction of a double-acting hydraulic pit prop is effected by directing pressure fluid through an external supply branch line (8) having an adjustable throttle means (9) in parallel with a closed non-return valve (11); fluid displaced from the lower end of the prop being directed to a return line (3) through a time-controlled switch valve (1). As the prop is extended to the roof fluid displaced from its upper end passes through valve (11) in preference to throttle means (9) to supply line (2).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEG44042A DE1215634B (en) | 1965-07-01 | 1965-07-01 | Pit stamp for remote-controlled support frames |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1120896A true GB1120896A (en) | 1968-07-24 |
Family
ID=7127338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2894966A Expired GB1120896A (en) | 1965-07-01 | 1966-06-28 | Improvements in or relating to hydraulic pit props |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1215634B (en) |
| GB (1) | GB1120896A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3436043A1 (en) * | 1984-10-02 | 1986-04-30 | Klöckner-Becorit GmbH, 4620 Castrop-Rauxel | Method and device for withdrawing a prop for underground mine support |
-
1965
- 1965-07-01 DE DEG44042A patent/DE1215634B/en active Pending
-
1966
- 1966-06-28 GB GB2894966A patent/GB1120896A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1215634B (en) | 1966-05-05 |
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