GB907304A - Improvements in hydraulic props or struts - Google Patents
Improvements in hydraulic props or strutsInfo
- Publication number
- GB907304A GB907304A GB1754959A GB1754959A GB907304A GB 907304 A GB907304 A GB 907304A GB 1754959 A GB1754959 A GB 1754959A GB 1754959 A GB1754959 A GB 1754959A GB 907304 A GB907304 A GB 907304A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- eccentric
- pressure chamber
- prop
- pump
- 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
- 238000005065 mining Methods 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification 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
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)
Abstract
907,304. Hydraulic pit props. DOWTY MINING EQUIPMENT Ltd. Aug. 10, 1960 [May 22, 1959; July 23, 1959], Nos. 17549/59 and 25341/59. Class 20 (2). An hydraulic pit prop (see Fig. 1 of Provisional Specification 17549/59) comprises telescopic members 1, 2, a variable volume pressurechamber 3, 4, and a pump 7, 8 which is actuated by a rod 15 controlled by an eccentric 16, 17 and has an inlet port 31 and an outlet port controlled by a valve 29. A combined relief and release valve 13 is urged by a spring-loaded seating member 22 against a ported spigot 9 which is adapted to permit communication between the pressure chamber and the prop reservoir, the valve 13 being lifted by excess pressure in the pressure chamber or under control of the eccentric 16, 17. In a modification, (see the drawings accompanying Provisional Specification 25341/59) the outer prop unit 1, 7 slides on an intermediate member 3 and incorporates a pump plunger 8 actuated by an eccentric 16, 17, inlet and outlet valves 31, 29 in the pump chamber and a combined relief and release valve 13. The valve 13 bears on a spring-loaded seating 22 and a ported spigot 9 which is carried by the piston 8 and provided with a stop-nut 33 to limit its travel, whereupon a further lift applied to the piston-rod 15 or excess pressure on the valve 13 will serve to lift the valve seating 22 and establish communication between the pressure chamber and the reservoir. Specification 904,866 is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1754959A GB907304A (en) | 1959-05-22 | 1959-05-22 | Improvements in hydraulic props or struts |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1754959A GB907304A (en) | 1959-05-22 | 1959-05-22 | Improvements in hydraulic props or struts |
Publications (1)
Publication Number | Publication Date |
---|---|
GB907304A true GB907304A (en) | 1962-10-03 |
Family
ID=10097134
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1754959A Expired GB907304A (en) | 1959-05-22 | 1959-05-22 | Improvements in hydraulic props or struts |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB907304A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107829897A (en) * | 2017-11-22 | 2018-03-23 | 浙江力俭新能源科技有限公司 | A kind of hydraulic pump |
-
1959
- 1959-05-22 GB GB1754959A patent/GB907304A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107829897A (en) * | 2017-11-22 | 2018-03-23 | 浙江力俭新能源科技有限公司 | A kind of hydraulic pump |
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