GB935257A - Improvements relating to hydraulic prop assemblies - Google Patents
Improvements relating to hydraulic prop assembliesInfo
- Publication number
- GB935257A GB935257A GB3843060A GB3843060A GB935257A GB 935257 A GB935257 A GB 935257A GB 3843060 A GB3843060 A GB 3843060A GB 3843060 A GB3843060 A GB 3843060A GB 935257 A GB935257 A GB 935257A
- Authority
- GB
- United Kingdom
- Prior art keywords
- improvements relating
- hydraulic prop
- nov
- prop
- relief valve
- 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
- 230000000712 assembly Effects 0.000 title 1
- 238000000429 assembly Methods 0.000 title 1
- 238000005065 mining Methods 0.000 abstract 1
- 238000005192 partition 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
- E21D15/50—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)
- Check Valves (AREA)
Abstract
935,257. Hydraulic pit props. DOWTY MINING EQUIPMENT Ltd. Nov. 13, 1961 [Nov. 9, 1960], No. 38430/60. Class 20 (2). In an hydraulic pit prop comprising at least three telescopic portions 1, 5, 9, the intermediate portion 5 is provided with a partition 6 and a seal 7 separating two pressure chambers 18, 19 communicating through a check valve 17 and an auxiliary relief valve 24 in series with a main relief valve 4, the two valves 4, 24, being equated to ensure uniform yielding of the prop portions.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3843060A GB935257A (en) | 1960-11-09 | 1960-11-09 | Improvements relating to hydraulic prop assemblies |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3843060A GB935257A (en) | 1960-11-09 | 1960-11-09 | Improvements relating to hydraulic prop assemblies |
Publications (1)
Publication Number | Publication Date |
---|---|
GB935257A true GB935257A (en) | 1963-08-28 |
Family
ID=10403380
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3843060A Expired GB935257A (en) | 1960-11-09 | 1960-11-09 | Improvements relating to hydraulic prop assemblies |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB935257A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2176846A (en) * | 1985-06-19 | 1987-01-07 | Kloeckner Becorit Gmbh | Three part telescopic prop |
-
1960
- 1960-11-09 GB GB3843060A patent/GB935257A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2176846A (en) * | 1985-06-19 | 1987-01-07 | Kloeckner Becorit Gmbh | Three part telescopic prop |
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