US2954740A - Pump means for hydraulic jacks - Google Patents

Pump means for hydraulic jacks Download PDF

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Publication number
US2954740A
US2954740A US482335A US48233555A US2954740A US 2954740 A US2954740 A US 2954740A US 482335 A US482335 A US 482335A US 48233555 A US48233555 A US 48233555A US 2954740 A US2954740 A US 2954740A
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Prior art keywords
piston
pressure
during
stroke
chamber
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Expired - Lifetime
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US482335A
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English (en)
Inventor
Wilkenloh Wilhelm
Jager Erich
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Rheinstahl Wanheim GmbH
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Rheinstahl Wanheim GmbH
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    • 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

Definitions

  • the present invention relates to hydraulic arrangements adapted to be used as props or jacks.
  • the structure of the present invention may be used as a prop extending between the floor and roof of a mine. It is often desirable with such hydraulic arrangements to provide very large forces which are difficult to obtain with known hydraulic arrangements which are used as jacks or props, and where a rapid movement of such a jack or prop into an expanded position is required it is necessary to use undesirably large pistons. Furthermore, with the known hydraulic arrangements a great deal of energy used in opcrating pumps of such arrangements is wasted.
  • One of the objects of the present invention is to provide a hydraulic jack or prop with a pump which enables energy applied to the pump during one of its strokes but not used for that stroke to be stored in the pump and automatically used as part of the force for effecting the succeeding stroke of the pump.
  • Another object of the present invention is to provide a hydraulic jack or prop with a pump which requires substantially equal forces for its suction and pressure strokes.
  • a further object of the present invention is to provide a hydraulic jack or prop capable of being rapidly expanded without having undesirably large pistons.
  • An additional object of the present invention is to provide in an arrangement of the above type a pump structure capable of being manually operated and being made up of simple and ruggedly constructed parts many of which perform multiple functions.
  • the present invention mainly consists of an expandable and collapsible hydraulic arrangement to be used as a jack or a prop, this arrangement including a plurality of telescoped tubes and pump means in the tubes for expanding the same.
  • An operating means is connected to the pump means for moving the same through operating cycles each of which includes a pressure stroke and asuction stroke, and a means, forming part of the pump means, is provided for storing energy applied to the pump means through the operating means during one of the strokes and applying the stored energy to the pump means during the other of the strokes.
  • the drawing is a longitudinal; central section through a hydraulic arrangement. constructed in accordance with the present invention, part of the structure being schematically illustrated, and parts of the elongated tubes being broken away so as to enable the structure to be conveniently illustrated.
  • an outer tube 6 has an inner tube 3 telescopically slidable therein.
  • the outer tube 6 is provided at its bottom'end with an end wall 6.
  • the inner tube 3 is provided within the tube 6 with an end wall in the form of a piston 2, which slidably engages the inner surface of the tube 6.
  • the end wall 6 and end wall 2 form between themselves within the tube 6 a chamber 5.
  • a pair of pins 30 are fixed to the inner tube 3 and extend into the interior thereof where they support an enclosure 8 having a bottom end wall formed with a bore passing therethrough.
  • a hollow shaft 4 extends through a bore of piston 2 and through the bore of the end wall of enclosure 8 so that the interior 7 of enclosure 8 communicates through the shaft 4- with the chamber 5.
  • the chambers 5 and 7 together with the interior of shaft 4 form a high pressure chamber, as will be apparent from the description which follows.
  • the lower end portion of the hollow shaft 1 extends slidably through a sealing ring 9 located in the bore of piston 2, and the top endof the shaft 4 is fixed to a tubular piston 25 which extends slidably through a sealing ring 19 carried by the enclosure 8 at the bore thereof.
  • This enclosure 8 also forms a housing for a valve, as will be apparent from the description which follows.
  • a crank 12 is turnable within a tubular member 12 extending through and carried by the wall of the inner tube 3, and this crank 12 has at its outer end face a non-circular projection 11 to which a crank handle may be fixed so that crank 12 may be manually rotated.
  • a crank pin 13 is fixed eccentrically to the inner face of crank 12, and this pin 13 extends into a recess within a block 14 fixed to the shaft 4 at the exterior thereof. The recess of block 14 into which the pin 13 extends is large enough to permit rotation of the crank 12 while retaining the pin 13 in engagement with the block 14. Thus, during rotation of the crank 12 the shaft 4 will be raised and lowered.
  • a piston 15 is fixed to the shaft 4 and thus moves therewith.
  • a second piston 17 is located about the shaft 4 and is formed with a bore 15 into which the piston 15 slidably extends when the piston 15 is moved with respect to piston 17 downwardly beyond the position shown in the drawing.
  • the bore 16 is a suction bore, andthe piston 17 is located slidably Within a cylindrical extension 1 of the' piston 2.
  • a sealing ring 18 is located on piston 17 at bore 15 to seal the engagement between pistons 15 and 17.
  • a ring 19 is located freely about the shaft 4- for movement with respect to the same and rests against the piston 15 in the position of the parts shown in the drawing.
  • a spring 20 located about the shaft 4 has one end in engagement with a ring 21 which is fixed rigidly to the shaft 4 as by welding or the like. Upon downward movement of the piston 15 with the shaft 4, the ring 19 will engage the piston 17 and there will be sufiicient force in the spring 21 ⁇ to urge the piston 17 downwardly together with the piston 15 as long as the pressure of the fluid medium within the extension 1 is below a given value.
  • a plate 22' is retained against the bottom face of piston 2 and is formed with a central bore about which a coil spring 22 is located on the upper face of the plate 22.
  • This coil spring 22 bears against a ring 9' which in turn bears against the sealing ring 9 to maintain the latter against the bottom face of the inner circular portion 2 of piston 2 which. directly surrounds the shaft 4 and which is formed with bores passing therethrough, as shown in the drawing.
  • the enclosure 8 is formed in its top wall with a bore through which a valve body 31 slidably extends.
  • a spring 32 in the enclosure 8 urges a ring 33 against a sealing ring 34 which engages the valve body 31 and seals the engagement between the valve body 31 and the enclosure 8.
  • the valve body 31 is itself axially bored and a valve member 35 formed with an outer axially extending groove 36 is slidable in the bore of valve body 31.
  • the bottom end of valve member 35 is enlarged and bears against the bottom end of the bore of body 31 to close this bore.
  • a plurality of ring-shaped dish springs 37 engage a nut 38 to urge the ,bottom end of valve 35 against its seat.
  • a cylindrical member 39 is freely located about the enclosure 8 and is formed with elongated cutouts through which the pins 30 freely extend.
  • the cylindrical member 39 has a top wall formed with a bore through which the body 31 extends, and this body 31 is formed with an outer annular projection 40 against which the top wall of the member 39 is urged by the ring-shaped dish springs 41 located about shaft 4 and between enclosure 8 and the bottom wall of the cylindrical member 39.
  • a block 42 is located within the tube 3 above the valve body 31 and is provided with a bottom extension 43 located in alignment with the valve 35.
  • a spring 44 engages the top face of member 39 and block 42 to urge the latter upwardly, and the top end of block 42 is formed as a valve 45 which engages the annular member 46 located in the interior of tube 3 to close the interior of tube 3, this annular member 46 having its central opening in communication with a bore 47 formed in the top wall of the tube 3.
  • a crank 48 is turnably carried in a tube 49 fixed to and extending through the wall of the tube 3, and the crank 48 has a non-circular extension 50 to which a handle is adapted to be connected.
  • the interior of the tube 3 is filled with any suitable hydraulic fluid such as oil by turning the crank 48 so as to open the passage through the ring 46.
  • the spring 44 closes this passage by moving the valve 45 into engagement with the ring 46.
  • the crank 48 is turned sufiiciently to cause extension 43 to open the valve 35 and the oil flows into chamber 7 and down the shaft 4 into chamber 5, the valve 35 being returned to its closed position by springs 37 when the crank 48 is released.
  • valve 31, 35 will act as a safety valve when the predetermined maximum pressure is surpassed.
  • the increased pressure in chamber 7 will lift the valve body 31. Since this valve body 31 contacts .with its flange 40 the member 39, this member will be also lifted against the force of the spring plates 41. The action will take place only when the pressure in the chamber 7 is increased so that this pressure will overcome the force of spring plates 41.
  • the valve body 31 is thus lifted the upper end of the valve stem 35 will abut against the extension 43 of the block 42 and the valve will open so that compressed fluid may pass from the chamber 7 into the tube 3. Thereby the pressure in the chamber 7 and the chamber 5 connected thereto is reduced to the permissible maximum pressure.
  • the crank 48 When it is desired to move tube 3 back into the tube 6, the crank 48 is again turned so as to move the block 42 downwardly, as viewed in the drawing, and this results on the one hand in opening of the passage through ring 46 so that the interior of tube 3 communicates with the atmosphere, and on the other hand in the opening of the valve 35 so that fluid in the chamber 5 may flow upwardly through the tube 4 into the chamber 7 and from thelatter through the valve body 31 into the tube 3.
  • the valve 31, 35 has therefore two purposes. It will serve as outlet valve whenever it is desired to collapse the expanded prop, in which case the valve is operated by the crank 48. Secondly, the valve 31, 35 will act as safety valve to prevent increase of the pressure fluid in the chamber 7 above a predetermined maximum amount.
  • the hydraulic prop as described above operates as follows:
  • a pump action is always assured by the two pistons 15 and 25.
  • the chamber 1 communicates with the interior of tube 3 and fluid will enter from the tube 3 into the chamber 1.
  • the piston 15 inters into the chamber 1 and displaces fluid therefrom into the chambers 5 and 7. Every down stroke therefore increases the amount of fluid in the pressure chambers 5 and 7.
  • the amount of liquid in the chambers 5 and 7 remains constant and the pressure increases as the piston 25 displaces liquid from the chamber 7 into the chamber 5 whereby the top plate of tube 3 will be pressed with increased force against the wall it abuts.
  • the energy accumulated by and returned to the piston 25 is increased with increasing pressure of the fluid in the chambers 5 and 7. The accumulation of energy therefore increases as the necessary force for the pumping action becomes greater.
  • a compensation of the crank forces during the up and down strokes therefore takes place during all pressure conditions in the chambers 5 and 7.
  • a pump and pressure chamber unit in combination, a first pressure chamber; a second pressure chamber; reciprocating pump means having a pressure stroke and a suction stroke for pumping pressure fluid into said first pressure chamber during said pressure stroke thereof and including a hollow shaft communicating at opposite ends thereof with said first and said second pressure chamber, respectively; a piston fixedly mounted on said hollow shaft for movement in and out of said second pressure chamber for increasing the volume of said second pressure chamber during the pressure stroke of said pump means and for decreasing the volume of said second pressure chamber during the suction stroke of said pump means; and operating means operatively connected to said hollow shaft for reciprocating said pump means and for moving said piston out of said second pressure chamber during the pressure stroke of said pump means and into said second, pressure chamber during the suction stroke of said pump means.
  • a pump and pressure chamber unit in combination, a first pressure chamber; a second pressure chamber; reciprocating pump means having a pressure stroke and a suction stroke for pumping pressure fluid into said first pressure chamber during said pressure stroke thereof and including a cylinder having an end wall, piston means arranged in said cylinder movable towards and away from said end wall, inlet valve means formed in said piston means, outlet valve means in said end wall, and a hollow shaft communicating at opposite ends thereof with said first and second pressure chamber, respectively, and operatively connected to said piston means; a piston fixedly mounted on said hollow shaft for movement in and out of said second pressure chamber for increasing the volume of said second pressure chamber during the pressure strokes of said pump means and for decreasing the volume of said second pressure chamber during the suction stroke of said pump means; and operating means operatively connected to said hollow shaft for reciprocating said pump means and for moving said piston out of said second pressure chamber during the pressure stroke of said pump means and into said second pressure chamber during the suction stroke of said pump means.
  • a pump and pressure chamber unit in combination, a first pressure chamber; a second pressure chamber; reciprocating pump means having a pressure stroke and a suction stroke for pumping pressure fluid into said first pressure chamber during said pressure stroke thereof and including a cylinder having an end wall, piston means arranged in said cylinder movable towards and away from saidend wall, inlet valve means formed in said piston means, outlet valve means in said end wall, and a hollow shaft communicating at opposite ends thereof with said first and second pressure chamber, respectively, and operatively connected to said piston means, said hollow shaft being concentrically arranged with said outlet valve means and being guided therein; a piston fixedly mounted on said hollow shaft for movement in and out of said second pressure chamber for increasing the volume of said second pressure chamber duringthe pressure stroke of said pump means and for decreasing the volume of said second pressure chamber during the suction stroke of said pump means; and operating means operatively connected to said hollow shaft for reciprocating said pump means and for moving said piston out of said second pressure chamber during the pressure stroke of said pump means and into said second pressure chamber during the su
  • a pump and pressure chamber unit in combination, a first pressure chamber; a second pressure chamber;
  • reciprocating pump means having a pressure stroke and a suction stroke for pumping pressure fluid into said first pressure chamber during said pressure stroke thereof and including a cylinder having an end wall formed with a bore therethrough communicating at one end thereof with said first pressure chamber, a hollow shaft communicating at opposite ends thereof with said first and second pressure chamber, respectively, and extending with clearance through said bore, combined seal and non-return valve means located in said bore about said shaft for preventing fluid from flowing from said first pressure chamber into said cylinder and permitting fluid to flow through said bore from said cylinder into said first pressure chamber, a first piston slidable in said cylinder and formed with a second bore through which said shaft passes with clearance, a second piston fixed to said shaft and slidable into and out of said second bore, and spring means operatively connected to said shaft and engaging said pistons for moving said first piston together with said second piston when pressure in said cylinder is below a predetermined value; a third piston fixedly mounted on said hollow shaft for movement in and out of said second pressure chamber for increasingthe volume of said second pressure chamber
  • a pump and pressure chamber unit in combination, a first pressure chamber; a second pressure chamber; reciprocating pump means having a pressure stroke and a suction stroke for pumping pressure fluid into said first pressure chamber during said pressure stroke thereof and including a cylinder having an end wall formed with a bore therethrough communicating at one end thereof with said first pressure chamber, a hollow shaft communicating at opposite ends thereof with said first and second pressure chamber, respectively, and extending with clearance through said bore, combined seal and nonreturn valve means located in said bore about said shaft for preventing fluid from flowing from said first pressure cham ber into said cylinder and permitting fluid to flow through said bore from said cylinder into said first pressure chamber, a first piston slidable in said cylinder and formed with a stepped bore having a smaller diameter at the end of the bore directed toward said cylinder through which said shaft passes with clearance, a second piston fixed to said shaft and having an outside diameter equal to said smaller diameter of said here, said second piston being movable from a position in which it is located outside said smaller diameter of said bore so that fluid may

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  • 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)
US482335A 1954-01-16 1955-01-17 Pump means for hydraulic jacks Expired - Lifetime US2954740A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE780345X 1954-01-16

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US2954740A true US2954740A (en) 1960-10-04

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US482335A Expired - Lifetime US2954740A (en) 1954-01-16 1955-01-17 Pump means for hydraulic jacks

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US (1) US2954740A (fr)
FR (1) FR1115536A (fr)
GB (1) GB780345A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3112705A (en) * 1961-10-05 1963-12-03 Jane Wallen Two-speed hydraulic pumps
US3134398A (en) * 1960-06-17 1964-05-26 Acrow Eng Ltd Hydraulic prop valve
CN102022128A (zh) * 2011-01-06 2011-04-20 王洁 一种气液支柱

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US430251A (en) * 1890-06-17 Force-pump
US945648A (en) * 1908-07-11 1910-01-04 Charles Cheers Wakefield Pump.
US947613A (en) * 1910-01-25 Bethlehem Steel Corp Hydraulic jack.
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
US2435326A (en) * 1945-03-02 1948-02-03 Duff Norton Mfg Company Fluid pump
US2440060A (en) * 1944-10-27 1948-04-20 Herbert E Page Pump for hydraulic jacks
US2550163A (en) * 1946-02-27 1951-04-24 Vulcan Mfg Co Inc Rigid handle axle jack

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US430251A (en) * 1890-06-17 Force-pump
US947613A (en) * 1910-01-25 Bethlehem Steel Corp Hydraulic jack.
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

Cited By (4)

* Cited by examiner, † Cited by third party
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
CN102022128A (zh) * 2011-01-06 2011-04-20 王洁 一种气液支柱
CN102022128B (zh) * 2011-01-06 2012-02-15 王洁 一种气液支柱

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Publication number Publication date
GB780345A (en) 1957-07-31
FR1115536A (fr) 1956-04-25

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