GB1137856A - Hydraulic pit prop - Google Patents
Hydraulic pit propInfo
- Publication number
- GB1137856A GB1137856A GB565066A GB565066A GB1137856A GB 1137856 A GB1137856 A GB 1137856A GB 565066 A GB565066 A GB 565066A GB 565066 A GB565066 A GB 565066A GB 1137856 A GB1137856 A GB 1137856A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chamber
- valve
- hydraulic pit
- prop
- feb
- 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
- 238000007789 sealing Methods 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
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)
- Fluid-Pressure Circuits (AREA)
Abstract
1,137,856. Hydraulic pit props. GEWERKSCHAFT EISENHUTTE WESTFALIA. 9 Feb., 1966 [13 Feb., 1965], No. 5650/66. Heading EIE. An hydraulic pit prop of the piston and cylinder type adapted to be positively retracted by the supply of pressure fluid to a chamber 1 is provided with a valve 15 serving both to control setting of the prop and to limit the pressure in the chamber 1 during retraction. The valve 15 is opened by a plunger 5 contacting a sealing sleeve 13 during extension in order to allow an escape of pressure fluid from the main working chamber through passages 8 and 9. On retraction the valve 15 is lifted against its spring 18 to allow an escape of fluid from the chamber 1 into the main working chamber which is being vented.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEG42850A DE1227410B (en) | 1965-02-13 | 1965-02-13 | Valve arrangement for double-acting hydraulic pit rams, especially for stepping expansion units |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1137856A true GB1137856A (en) | 1968-12-27 |
Family
ID=7127026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB565066A Expired GB1137856A (en) | 1965-02-13 | 1966-02-09 | Hydraulic pit prop |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE676357A (en) |
| DE (1) | DE1227410B (en) |
| GB (1) | GB1137856A (en) |
| NL (1) | NL6601793A (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB774470A (en) * | 1955-11-19 | 1957-05-08 | Becorit Grubenausbau Gmbh | Improvements relating to hydraulic pit-props |
| BE560243A (en) * | 1956-08-25 | |||
| DE1150640B (en) * | 1960-03-21 | 1963-06-27 | Ewald Wiemann Maschf | Limiting valve for hydraulic pit rams |
| DE1149318B (en) * | 1960-08-05 | 1963-05-30 | H Joe Rheinbay Dipl Ing | Hydraulically operated pit ram |
| DE1138007B (en) * | 1960-12-16 | 1962-10-18 | Bosch Gmbh Robert | Multi-part pit stamp |
| DE1163275B (en) * | 1961-09-04 | 1964-02-20 | Kronprinz Ag | Device for limiting the stroke of hydraulic pit rams |
-
1965
- 1965-02-13 DE DEG42850A patent/DE1227410B/en active Pending
-
1966
- 1966-02-09 GB GB565066A patent/GB1137856A/en not_active Expired
- 1966-02-11 BE BE676357D patent/BE676357A/xx unknown
- 1966-02-11 NL NL6601793A patent/NL6601793A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NL6601793A (en) | 1966-08-15 |
| BE676357A (en) | 1966-08-11 |
| DE1227410B (en) | 1966-10-27 |
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