US3012404A - Hydraulic support - Google Patents

Hydraulic support Download PDF

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Publication number
US3012404A
US3012404A US628112A US62811256A US3012404A US 3012404 A US3012404 A US 3012404A US 628112 A US628112 A US 628112A US 62811256 A US62811256 A US 62811256A US 3012404 A US3012404 A US 3012404A
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United States
Prior art keywords
reservoir
liquid
collapsible
expandible
pressure chamber
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 - Lifetime
Application number
US628112A
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English (en)
Inventor
Wilkenloh Wilhelm
Jaeger Erich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rheinstahl Wanheim GmbH
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Rheinstahl Wanheim GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Rheinstahl Wanheim GmbH filed Critical Rheinstahl Wanheim GmbH
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Publication of US3012404A publication Critical patent/US3012404A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/12—Valves; Arrangement of valves arranged in or on pistons
    • F04B53/122—Valves; Arrangement of valves arranged in or on pistons the piston being free-floating, e.g. the valve being formed between the actuating rod and the piston
    • 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
    • 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
    • E21D15/60—Devices for withdrawing props or chocks
    • E21D15/603—Devices for withdrawing props or chocks by means of hydraulic devices
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/006—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices
    • E21D23/0069—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices without essential advancing shifting devices

Definitions

  • the present invention relates to supporting structures and more particularly to hydraulic supporting structures of the type which may be used, for example, as pit props in mine galleries.
  • hydraulic supporting arrangements of this type A it is customary to enable the pit props or the like to co1- lapse by directing liquid from pressure chambers thereof to a suitable reservoir. Howeyer, the speed and eliiciency of the collapse of such hydraulic arrangements is not very high because of the fact that only a small cross section of ilow is provided by opening a valve in order to collapse the support structure and also collapse is retarded by the rictional engagement between relatively sliding parts. Furthermore, air becomes trapped Wi-thin the reservoir to which a pressure liquid is returned so that the collapse of the structure is also retarded in this way.
  • One of the objects of the present invention is to provide a hydraulic collapsible and expandible supporting arrangement which is capable of being quickly and efficiently collapsed.
  • Another object of the present invention is to providel an arrangement which guarantees that a reservoir to which pressure liquid is returned during collapse of the supporting arrangement is at less than atmospheric pressure so that a quick efficient flow of the liquid back to the reservoir during collapse of the supporting arrangement is assured.
  • lt is also an object of the present invention to adapt the principle of the invention -for use either with individual supporting units or with an arrangement of a group of supporting units.
  • An addititonal object of the present invention is to provide structure capable of accomplishing all of the above objects and at the same time composed of simple and ruggediy constructed elements which are very reliable in operation.
  • the present invention mainly consists of a hydraulic supporting arrangement which includes an expandible and collapsible means having a collapsed rest position and an expanded supporting position, this means including a pressure chamber to which liquid is supplied during expansion and from which liquid ows during collapse of the expandible and collapsible means.
  • a reservoir is provided for the pressure liquid, and a pump means communicates with the reservoir and with the pressure chamber for pumping liquid .from the reservoir to the pressure chamber in order to expand the expandible and collapsible means.
  • a conduit means communicates with the pressure chamber and with the reservoir, and a valve means is in the conduit means for closing and opening the same so that when the valve means opensrthe conduitv means the pressure liquid may ow from the pressure chamber back to the reservoir to enable the collapsible and expandible means to collapse.
  • This reservoir has its interior at less than atmospheric pressure during the collapse of the expandible and collapsible means.
  • FIG. l is a sectional elevational view of an embodimeut of an individual supporting arrangement according to the present invention.
  • FIG. 2 diagrammatically illustrates an arrangement where a plurality of collapsibleV and expandible supporting units cooperate with la single reservoir and pumping assembly.
  • the structure shown in FIG. 1 may be used as a pit v prop, and this hydraulic supporting arrangement which is shown in FIG. l includes an inner tubular member 1 and au outer tubular member 3 within which the inner member 1 is slidable.
  • the bottom end of the inner memf ber 1 is closed by -a piston 2 which slides along the inner surface of the outer member 5 for the purpose of collapsing or expanding the supporting structure by changing the length thereof.
  • the pressure liquid 4 which may be a suitable oil or the like, is located within the reservoir 5 formed by the hollow interior of the inner member 1.
  • a pump means 6 is located in the interior of the inner.
  • the pump 6 is operated by an eccentric 14 carried by the inner member 1.
  • the eccentric 14 may Ibe turned by applying a crank to the noncircular portion 15 of the eccentric 14, and the eccentric pin at the left face of the eccentric 14, as viewed in FIG. 1, cooperates with an opening in a block 17 fixed to a tube S so that this block 17 reciprocates back and forth during rotation of the eccentric 14. At the start of the rotation the block 17 moves downwardly and the tube 8 which is fixed to the block 17 moves downwardly with the same.
  • the opening of the block 17 to which the eccentric pin of the eccentric 14 extends is long enough in a horizontal direction normal to the plane of FIG. l to accommodate this pin during the entire rotation of the eccentric 14. ln other words, the opening of the block 17 into which the eccentric pin extends has a horizontal length equal at least to the diameter of the eccentric 14.
  • the continued rotation of the eccentric 14 causes the annular disc 18 to engage the upper face of the larger piston 6c, this disc 18 being pressed by the spring 20 against the top face of the piston 6a which is xed to the tube 8.
  • the upper end of the spring 20 engages a flange 19 which is fixed to the tube 8 in the manner shown in FIG. l.
  • the piston 6c is urged to the position shown in FIG. l by the spring Z1 located in the interior of the piston 2 which closes the bottom end of the inner member -1, and the continued turning of the eccentric 14 causes the disc 18 to act on the piston 6c so as to lower means shown in FIG. 1.
  • the tube 8 carriesat its upper end a hollow cylinder V36 of a cross sectional area greater than that of the tube 8.
  • This hollow cylinder 36 extends into the inner chamber 9 of a cylinder 30 which is supported in the interior of the inner member 1 yby the pins 33.V
  • the chamber 9 is closed by a valve which is carried by a member 29 which provides a valve seat for the valve 10.
  • This mem- Y ,ber 29 forms a closure for the cylinder 30 and the interior of the cylinder 30 is sealed at the. element 29 by the slidable sealing ring 31 which is urged upwardly against the "member 29 by the spring 32.
  • the spring 32 also urges the member 29 upwardly, and an outer ange ofthe member 29 ⁇ bears against a wall of a cylindrical member 34 formed with suitable cutouts through which the pins 33 extend. rlhe annular dishr springs 35 located between members 36 and 34 maintain the latter in engagement with the flange of the member 29.
  • the amount of liquid which ows from the pressure chamber 7' into the chamber 9 is much smaller than the amount of liquid which is pumped by the pump means 6 from the reservoir 5 into the pressure chamber 7.
  • the downward ymovement of the tube 8 is furthermore in the direction of the force of the pressure of the iluid in the chamber 9 which acts on the cross sectional area of the hollow cylinder 36, this cylinder 36 having a larger cross sectional area than the tube 8.
  • the block 26 carries a bottom extension which is located opposite the stem of the valve 10, and it will be noted that a spring 2,7 engages the member 34 and the block 26 to urge the latter upwardly, the upper end of the block 26 carrying a portion which extends slida'bly through a suitable sleeve fixed to the top of the reservoir 5 so as to provide a seal from Ythe outside at this portion of the apparatus.
  • a stack of annular dish springs 28 urges the valve 10 upwardly, yand the downward movement of the block 26 upon turning of the eccentric 25 causes the valve 10 to-be moved downwardly against the force of ⁇ the spring 28 so that the valve 10 is moved ⁇ in this way to its open position and provides communication between the chamber 9 and the reservoir 5.
  • the tube 8 together with Vthe cylinder 36 and the Vcylinder 30 and together with the member 29 form a conduit means which provides communication between the reservoir 5 and the pressure chamber 7, and the valve 1t) is capable of closing and opening this conduit means. Since the chamber 9 is at the same pressure as the pressure chamber 7, when the valve 10 is opened the liquid in the pressure chamber 7 can flow into the reservoir 5 which is at less lthan atmospheric pressure, so that the difference between atmospheric pressure and the pressure within the chamber 5 accelerates the ow of liquid from the pressure chamber 7 into the reservoir ⁇ 5, the atmospheric pressure acting upon the piston 2 of the'Y inner member 1.
  • the eccentric 25 can be turned further to an extent suicient to move the member 29 so ifar into the cylinder 30 that the sealing ring 31 moves out of its bore and thus a larger cross section of ow is provided.
  • the member 29 is provided just above the sealing ring 31 with axially extending grooves which Vcommunicate with the interior of the cylinder 30 when the member 29 is Vmoved downwardly through la suicient distance.
  • This downward movement of the member 2,9 is provided by engagement of the bottom face of the block 26 with the top annular face of the member 29, this annular face of Of course, the spring 32 is compressed during this downward movement of the member 29.
  • the reservoir 5 is carefully sealed off fromV the outer atmosphere.
  • the piston 2 ofthe inner member 1 carries an additional sealing ring 1'3 to provide a seal from the outer atmosphere.
  • the upper portion of the inner member 1 carries a suitable itting 12 which is adapted to be connected to a vacuum pump and which carries a non-return valve 11.
  • a vacuum pump when -a vacuum pump is connected to the ditting 12 the force of suction acts to automatically open the valve l11 and the interior of the reservoir 5 may be evacuated.
  • FIG. 2 shows an arrangement where a plurality of expandible and collapsible means are operated from a single reservoir and pump assembly.
  • Each of the collapsible and expandible means of FIG. 2 consists in part of an outer tubular member 40 and an inner member 41 slidable along the interior of the member 40, a suitable seal 42 providing a closure of the pressure chamber 45 in the interior of member 40 from the outer atmosphere.
  • the head end 43 of each of the supporting assemblies of FIG. 2 is connected to a guide rail -44 from which the supporting assembly is suspended.
  • the several pressure chambers 4S communicate through conduits 46 and three-way valve 47 with la pump 48, the suction line of which extends almost to the bottom of a reservoir 49 which is closed rolf from the outer atmosphere.
  • Another conduit 50 provides communication between the three-way valve 47 and the reservoir 49.
  • the liquid 51 which may be a suitable oil or the like, is pumped out of the interior of the reservoir 49 by the pump 48 into the chambers 45 when the three-way valve 47 is suitably set.
  • the several collapsible and expandible means expand so that their length increases between the oor and the rail 44 until the rail 44 is pushed against the ceiling. If the plurality of collapsible and expandible means are suspendedv from the rail 44, this rail 44 is held against the ceiling by van undisclosed structure forming no part of the present invention and then the plurality of collapsible and expandible means expand downwardly until they engage and press against the floor.
  • the three-way valve 47 When it'is desired to cause the plurality of expandible and collapsible means to collapse, the three-way valve 47 is placed in a position which causes the conduits 46 to communicate with the conduit 50, and because of the vacuum formed in the space 54 over the liquid 51 in the interior of the reservoir 49, the liquid ows quickly from the pressure chamber 45 into the reservoir 49 so that the atmospheric pressure forces the plurality of expandible and collapsible means to collapse to their rest position.
  • the outer members 40 rise upwardly onto the members 41. Where the members 41 are not suspended, these members 41 move downwardly into the outer members 40, respectively.
  • a Vacuum pump 52 communicates with the interior of the reservoir 49, this vacuum pump 52 communicating with ya portion of the conduit '50, and a suitable valve being located in the conduit which leads from the Vacuum pump 52 to the conduit 50.
  • a hydraulic supporting arrangement to be used as a mine prop or the like comprising, in combination, collapsible and expandible means having a collapsed rest position and an expanded supporting position, said collapsible and expandible means including a pressure chamber to which liquid under pressure flows during expansion of said collapsible and expandible means and from which liquid flows during collapse of said collapsible and expandible means; a reservoir permanently sealed oft from the outer atmosphere and adapted to hold liquid to be supplied to and removed from said pressure chamber; pump means communicating with said reservoir and said pressure chamber for pumping liquid from said'reservoir to said pressure chamber for expanding said collapsible and expandible means, whereby a partial vacuum is created in said reservoir during pumping of liquid therefrom, said pump means including a cylinder formed with an inlet opening communicating with said reservoir and said cylinder being located below thelevel of liquid in said reservoir so that liquid may ilow under the inuence of gravity into said cylinder, a piston movable in said cylinder between a pressure stroke and a suction stroke,
  • a hydraulic supporting arrangement to be used as a mine prop or the like comprising, in combination, collapsible and expandible means having a collapsed rest position and an expanded supporting position, said collapsible and expandible means including a pressure chamber to which liquid under pressure ilows during expansion of said collapsible and expandible means and from which liquid flows during collapse of said collapsible and expandible means; a reservoir permanently sealed off from the outer atmosphere and adapted to hold liquid to be supplied to and removed from said pressure chamber; pump means communicating with said reservoir and said pressure chamber for pumping liquid from said reservoir to said pressure chamber for expanding said collapsible and expandible means, whereby a partial vacuum is created in said reservoir during pumping of liquid therefrom, said pump means including a cylinder formed with an inlet opening communicating with said reservoir and said cylinder 'being located below the level of liquid in said reservoir so that liquid may ow under the influence of gravity into said cylinder, a piston movable in said cylinder between a pressure stroke and a suction stroke, a valve
  • a hydraulic supporting arrangement to be used as a mine prop or the like comprising, in combination, collapsible and expandible means having a collapsed rest position and an expanded supporting position, said collapsible and expandible means including a pressure chamlber to -which liquid under pressure flows during expansion of said collapsible and expandible means and from which liquid flows during collapse of said collapsible and expandible means;V a reservoir permanently sealed oif from the outer atmosphere and adapted to hold liquid to be supplied to and removed from saidn pressure chamber; pump.
  • said pump means including a cylinder formed with an inlet opening communicating With said reservoir and said cylinder lbeing located below the level of liquid in said reservoir so that liquid may ow under the influence of gravity into said cylinder, a piston movable in said cylinder between a pressure stroke and a suction stroke, a valve cooperating with said inlet opening for opening and closing the same, means for reciprocating said piston, and connecting means for connecting said valve with said reciprocating means for closing said inlet opening during said pressure stroke and for positively moving said valve during said suction stroke to an open position regardless of the vacuum in said reservoir; conduit means providing communication between said pressure chamber and reservoir; valve means in said conduit means for opening and closing the latter, said valve means opening said conduit means during collapse of said collapsible and expandible means so that liquid flows from said pressure chamber through said conduit means to
  • a hydraulic upright supporting arrangement to be used as a mine prop or the like comprising, in com-bina-l tion, collapsible and eXpandible means including a pressure chamber located at the bottom region of the supporting arrangement to which liquid is supplied during expansion of said collapsible and expandible means and from which liquid ilows during contraction of said collapsible and expandible means; a reservoir permanently sealed ol Afrom the outer atmosphere and formed by a hollow portion of said collapsible and expandible means, said reservoir being located above saidpressure chamber'and being adapted to' contain a liquid to be supplied to said pressure chamber; pump means located in the interior of said collapsible and expandible means between and communicating with said pressure chamber andsaid reservoir fory pumping liquid from said reservoir to'rsaid pressure chamber for expanding said collapsible and expandible means, whereby a partial vacuum is createdV in said reservoir during pumping of liquid therefrom,said pump means including a cylinder'formed with an inlet opening communicating with said reservoir,

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Prostheses (AREA)
  • Pens And Brushes (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Jet Pumps And Other Pumps (AREA)
US628112A 1955-12-13 1956-12-13 Hydraulic support Expired - Lifetime US3012404A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEE11676A DE1032200B (de) 1955-12-13 1955-12-13 Hydraulisch betriebenes Stuetzelement

Publications (1)

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US3012404A true US3012404A (en) 1961-12-12

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US628112A Expired - Lifetime US3012404A (en) 1955-12-13 1956-12-13 Hydraulic support

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US (1) US3012404A (en(2012))
BE (1) BE552440A (en(2012))
DE (1) DE1032200B (en(2012))
FR (1) FR1167822A (en(2012))
GB (1) GB816247A (en(2012))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3712758A (en) * 1970-09-10 1973-01-23 Int Harvester Co Variable displacement pump
US3882761A (en) * 1973-11-14 1975-05-13 Joseph D Snitgen Fluid stop mechanism

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US16801A (en) * 1857-03-10 George lindsay
US205674A (en) * 1878-07-02 Improvement in hydraulic jacks
US868868A (en) * 1907-04-05 1907-10-22 Peter Kiefer Air-motor.
US1624151A (en) * 1925-07-14 1927-04-12 Aladdin Hydraulic Jack Company Hydraulic jack
US1656430A (en) * 1926-03-16 1928-01-17 Herman D Eberle Hydraulic jack
US1745067A (en) * 1928-10-30 1930-01-28 Erie Hydraulic Mfg Company Hydraulic jack
US2119440A (en) * 1935-12-23 1938-05-31 Timothy C Pomeroy Hydraulic jack
US2621631A (en) * 1948-01-12 1952-12-16 Dowty Equipment Ltd Telescopic hydraulic mine roof support

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE510708C (de) * 1929-02-05 1930-10-22 Albert Hamel Abbaukammer mit in der Hoehe einstellbarem Dach
DE924686C (de) * 1951-11-30 1955-03-07 Emil Weber Hydraulische Setzvorrichtung fuer Stempel

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US16801A (en) * 1857-03-10 George lindsay
US205674A (en) * 1878-07-02 Improvement in hydraulic jacks
US868868A (en) * 1907-04-05 1907-10-22 Peter Kiefer Air-motor.
US1624151A (en) * 1925-07-14 1927-04-12 Aladdin Hydraulic Jack Company Hydraulic jack
US1656430A (en) * 1926-03-16 1928-01-17 Herman D Eberle Hydraulic jack
US1745067A (en) * 1928-10-30 1930-01-28 Erie Hydraulic Mfg Company Hydraulic jack
US2119440A (en) * 1935-12-23 1938-05-31 Timothy C Pomeroy Hydraulic jack
US2621631A (en) * 1948-01-12 1952-12-16 Dowty Equipment Ltd Telescopic hydraulic mine roof support

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3712758A (en) * 1970-09-10 1973-01-23 Int Harvester Co Variable displacement pump
US3882761A (en) * 1973-11-14 1975-05-13 Joseph D Snitgen Fluid stop mechanism

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Publication number Publication date
GB816247A (en) 1959-07-08
BE552440A (en(2012))
FR1167822A (fr) 1958-12-01
DE1032200B (de) 1958-06-19

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