GB780345A - Improvements in hydraulic supporting or lifting devices - Google Patents
Improvements in hydraulic supporting or lifting devicesInfo
- Publication number
- GB780345A GB780345A GB128/55A GB12855A GB780345A GB 780345 A GB780345 A GB 780345A GB 128/55 A GB128/55 A GB 128/55A GB 12855 A GB12855 A GB 12855A GB 780345 A GB780345 A GB 780345A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- rod
- chamber
- spring
- pressure
- 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
- 238000012856 packing Methods 0.000 abstract 1
- 238000005086 pumping 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
- E21D15/45—Hydraulic, pneumatic, or hydraulic-pneumatic props having closed fluid system, e.g. with built-in pumps or accumulators
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)
- Reciprocating Pumps (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
780,345. Hydraulic pit props. EISENWERK WANHEIM GES. Jan. 3,1955 [Jan. 16, 1954], No. 128/55. Class 20(2) [Also in Groups XXVIII and XXX] A hydraulic pit prop has a built in piston pump which comprises a low pressure piston 17 sliding in a cylinder 1 formed in the pressure piston 2 which is connected to the upper element 3 of the prop and which operates in a cylinder formed in the lower element 6. The piston 17 is adapted to be carried along by a plate 19 slidable on a hollow piston rod 4 and loaded by a spring 20 supported at the other end by a member 21 secured to the rod 4. A high pressure piston 15 is slidable in a bore 16 formed in the piston 17. The piston rod 4 passes through a packing 9 loaded by a spring 22 which functions as an outlet valve from the cylinder 1. Secured to the opposite end of the rod 4 is a compensating piston 25 operating in a chamber 8 which also contains an overload valve 26 which may also be manually operated by a shaft 27. Initial actuation of the rod 4 by a manually actuated shaft 12 operates the low pressure piston 17 through the spring 20 to extend the device. When the spring 20 can no longer move the piston 17. against the pressure in the chamber 5, the high pressure piston 15 operates to build up the final pressure. The pressure in the chamber 8 due to its connection through the hollow rod 4 to the chamber 5 acts on the piston 25 to assist the pumping stroke of the rod 4. Driving devices operated by compressed air may be used in place of a hand crank.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE780345X | 1954-01-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB780345A true GB780345A (en) | 1957-07-31 |
Family
ID=6688303
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB128/55A Expired GB780345A (en) | 1954-01-16 | 1955-01-03 | Improvements in hydraulic supporting or lifting devices |
Country Status (3)
Country | Link |
---|---|
US (1) | US2954740A (en) |
FR (1) | FR1115536A (en) |
GB (1) | GB780345A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3134398A (en) * | 1960-06-17 | 1964-05-26 | Acrow Eng Ltd | Hydraulic prop valve |
US3112705A (en) * | 1961-10-05 | 1963-12-03 | Jane Wallen | Two-speed hydraulic pumps |
CN102022128B (en) * | 2011-01-06 | 2012-02-15 | 王洁 | Gas and liquid strut |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US947613A (en) * | 1910-01-25 | Bethlehem Steel Corp | Hydraulic jack. | |
US430251A (en) * | 1890-06-17 | Force-pump | ||
US945648A (en) * | 1908-07-11 | 1910-01-04 | Charles Cheers Wakefield | Pump. |
US1170139A (en) * | 1915-01-23 | 1916-02-01 | G Briau Et A Soudee Soc | Combined suction and force pump. |
US1579913A (en) * | 1923-12-31 | 1926-04-06 | Harry E Bronson | Hydraulic jack |
US1829451A (en) * | 1928-06-15 | 1931-10-27 | Mcnab Absorbolift Inc | Hydraulic jack or shock absorber for vehicles |
US2048098A (en) * | 1933-08-09 | 1936-07-21 | Bohnenblust Arnold | Pump |
US2440060A (en) * | 1944-10-27 | 1948-04-20 | Herbert E Page | Pump for hydraulic jacks |
US2435326A (en) * | 1945-03-02 | 1948-02-03 | Duff Norton Mfg Company | Fluid pump |
US2550163A (en) * | 1946-02-27 | 1951-04-24 | Vulcan Mfg Co Inc | Rigid handle axle jack |
-
1954
- 1954-12-15 FR FR1115536D patent/FR1115536A/en not_active Expired
-
1955
- 1955-01-03 GB GB128/55A patent/GB780345A/en not_active Expired
- 1955-01-17 US US482335A patent/US2954740A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US2954740A (en) | 1960-10-04 |
FR1115536A (en) | 1956-04-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
ES471557A1 (en) | Hydraulic jack and patient lifting device using it. | |
GB780345A (en) | Improvements in hydraulic supporting or lifting devices | |
GB925777A (en) | Hydraulic jack | |
ES358285A1 (en) | Hydraulic cylinders having a quick exhaust | |
GB636568A (en) | Improvements in pit props and other telescopic struts | |
GB1501047A (en) | Pneumatic jack for vehicles | |
GB794064A (en) | Improvements in or relating to hydraulic pit props | |
GB794547A (en) | Improvements in or relating to extensible pit-props | |
GB870514A (en) | Improvements in or relating to hydraulic pit props | |
GB679822A (en) | Improvements in and relating to revolving-cylinder reciprocating hydraulic pumps | |
GB925355A (en) | Hydraulic jack with improved operating valve | |
GB866242A (en) | Improvements in or relating to pit props | |
GB894292A (en) | Improvements in or relating to hydraulic props, particularly pit props | |
GB724062A (en) | Improvements in and relating to hydraulic jacks | |
GB1517404A (en) | Piston and cylinder pumping units for hydraulic lifting devices | |
GB796827A (en) | Improvements in hydraulic pit-props, lifting jacks and the like | |
GB590566A (en) | Tripod jack | |
GB276237A (en) | Improvements in jacks for automobiles | |
GB737045A (en) | Improvements in or relating to manually-operated hydraulic jacks | |
GB910889A (en) | An improved hydraulic remote control apparatus and valve assembly therefor | |
GB707051A (en) | Improvements in or relating to pit props and like supports | |
GB322507A (en) | Improvements in or relating to lifting jacks | |
GB791466A (en) | Improvements in or relating to hydraulically-operated double-acting pushing jacks for the displacement of equipment, for example conveyors, in mineral workings | |
GB862033A (en) | Improvements in or relating to extensible hydraulic supports | |
GB927293A (en) | Improvements in fluid actuator devices |