US3590586A - Mine roof supports - Google Patents

Mine roof supports Download PDF

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Publication number
US3590586A
US3590586A US819782A US3590586DA US3590586A US 3590586 A US3590586 A US 3590586A US 819782 A US819782 A US 819782A US 3590586D A US3590586D A US 3590586DA US 3590586 A US3590586 A US 3590586A
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US
United States
Prior art keywords
leg
cylinder
mine roof
roof support
piston
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
US819782A
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English (en)
Inventor
Walter Lubojatsky
Bernhard Von Pelser-Berensberg
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.)
Gullick Ltd
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Gullick Ltd
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Filing date
Publication date
Application filed by Gullick Ltd filed Critical Gullick Ltd
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Publication of US3590586A publication Critical patent/US3590586A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • E21D23/0078—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 with individual shifting devices

Definitions

  • a mine roofsupport has a hydraulic leg-aligning device which on pressurization assumes an extension intermediate full and zero extension and which is positively connected so as to push and pull the leg as required.
  • the device may be double-acting piston and cylinder with means for injecting pressure fluid to make up the quantity of fluid in each end of the cylinder to a respective predetermined amount.
  • the device may comprise a hydraulically extensible member and a hydraulically contractable member so that on pressurization the first fully extends and the second fully contracts.
  • the two are connected in series mechanically.
  • the invention concerns a mine roof support with a leg or prop (hereinafter referred to as a leg)-which is movably fixed at the bottom of a box-type base and bears a roof bar device which rest against the roof.
  • a leg a leg or prop
  • an aligning device is provided to enable the leg or legs to adjust themselves into a freestanding position perpendicular or inclined relative to the strata.
  • Such alignment devices used with self-advancing mine roof support elements serve to bring the legs of the support element during the advancing operation, i.e. while the legs are released from between roof and floor, into a particular position relative to the box-type base, to which they are movably fixed.
  • a movable connection between box-type base and leg is necessary, so that the leg can avoid the large forces which can be caused by convergence between roof and floor surfaces or by sliding movement of the roof. These forces are large enough to destroy the legs if a rigid connection between legs and box-type-base is use
  • Resilient support arrangements are mainly used to realign a leg back into its ideal position when it is retracted.
  • freestanding position is used to mean that position which would be assumed by a leg if no forces were applied to the leg other than those applied by the aligning device which is also the position assumed if the force generated by the aligning device completely overrides any other forces on the leg under partial load conditions.
  • a mine roof support'having a leg-aligning device comprising a hydraulically extensible and hydraulically contractabledevice connected to the leg andto, say, the-base of the support in which the device is arranged on pressurization to adopt in intermediate position.
  • a mine roof support having a leg aligning device in the form of a piston and cylinder device having inlet means for pressure fluid to extend and contract it so that it takes up an intermediate position between maximum extension and maximum contraction and means whereby it may extend or contract on tilting of the leg by forces applied tothe leg.
  • the leg After'switching off the pressure medium supply to the aligning device, the leg can move in both directions to conform to movements of the roof or other strata movements relative to the box-type base. Damage to the aligning device through these forces is thus excluded. Furthermore, the aligning device acts on the leg from one side only and can be positively connected with it.
  • two hydraulic pressure rams forming the aligning device are arranged concentrically inside each other, the piston rod of the outer pressure ram being hollow and acting as a cylinder for the inner pressure ram.
  • This provides a particularly solid construction of the aligning device.
  • tensile and compression forces can, in the case of this arrangement of the pressure rams. influence the aligning device only in an axial direction.
  • lt is also useful, in the case of a concentric arrangement of the two hydraulic pressure rams, if the cylinder of the outer pressure ram is connected with the sidewall of the box-type base serving as abutment, while the piston rod of the inner pressure ram is connected with the leg.
  • a further possible version of the invention provides, that two cylinders are connected together and the piston in one cylinder is connected with the sidewall of the box-type base, and the piston in the other cylinder is connected with the leg.
  • the pressure medium is supplied simultaneously to the two cylinders.
  • abutment pins are provided in the pressure rams to limit the strokes of the pistons. These pins can be screwed into the un filled sides of the cylinders of the pressure rams. By means of these stop or abutment pins the retracting and extending distances of the piston rods can be controlled, and thus the position of the legs take up when the aligning deyice is pressurized.
  • the travel of the pistons can also be controlled by partially filling the nonpressurized ends of the cylinders. Furthermore it is possible to provide, in the connection between legs and aligning device on one hand, and/or in the connection between the aligning ram and the sidewall of the box-type base on the other hand, a bolt arrangement for adjusting the length of the connection.
  • a further solution of the above task is obtained with a mine roof support with an aligning device for one or several legs, which are fixed at the bottom of a box-type base arranged at the floor and bear together a roof bar device resting against the roof. Between one or several of the legs on one hand, and a sidewall of the box-type base on the other hand, the aligning device is fixed so that it can put the leg or legs into a position.
  • This mine roof support is characterized by the fact, that the aligning device consists of a double-acting hydraulic pressure ram whose two pressure chambers can be loaded with a defined quantity of pressure medium.
  • the aligning device Due to the structure of the aligning device, the aligning device has a predetermined len'gthwhen pressurized. At this length the leg to be aligned takesit's desired freestanding posi- The piston of this double-acting pressure ram takes up, in the freestanding position of the leg, suitably an intermediate position between its two end positions in the ram, so that it can be retracted further or extended further in the case of strata movements.
  • a particularly preferred version of such an aligning device provides, that each of the pressure chambers of the doubleacting hydraulic pressure ram is connected with a supply ram I for injecting a defined quantity of pressure medium.
  • the ram chamber of the supply ram is divided into two partial chambers through which a free position can be displaced.
  • One of these partial chambers of each supply ram is connected with the corresponding pressure chambers of each supply ram is connected with the corresponding pressure chamber of the double-acting hydraulic pressure ram, and the others with'a' pressure medium source.
  • the quantity of pressure medium is determined in such a way, that the free pistons are in an end position when the leg is in the desired free standing position:
  • FIG. I is a side view of a mine roof support with an aligning device for the legs, 1 v
  • FIG. 2 illustrates one type of aligning device
  • FIG. 3 shows a second type of aligning device
  • FIG. 4 represents a third type ofaligning device.
  • the specific description shows a box-type base 1 of a mine roof support to which legs 2 are universally articulated. On the legs is mounted a roof bar arrangement 3 underpinning the roof. Between a backwall 4 of the box-type base I and arear one of legs 2, an aligning device 5 is provided which is connected between the leg 2 and the backwall 4.
  • this aligning device 5 consists of an outer cylinder 6 inside which a piston 7 is arranged.
  • the corresponding piston rod 8 is hollow inside and serves, at thesame, time, as a cylinder for an inner pressure ram, in which there is a piston 8joined to a piston rod 10.
  • the outer cylinder 6 is connected with the backwall 4 of the box-type base 1 via a connecting device 11.
  • the piston rod 10 of the inner pressure ram is connected to a pull and push the leg 2 via a collar l2.
  • a pressure fluid inlet means 14 isprovided in the cylinder 6'to feed pressure fluid into the annular chamber 13 which is connected with a pressure chamber 15 of the inner pressure ram through connecting ducts 16 which are arranged inside the body or piston 7.
  • Screw pins 19 and can be screwed into the ram chambers 17 and 18, which are not loaded with pressure, in order to limit the stroke of the two pistons 7 and 9'.
  • a further version not shown in the drawing provides for the extension or shortening of the aligning device in the connection between the aligning device 5 on onehand and the leg 2 and/or the backwall 4, by means of bolt arrangements.
  • the aligning device shown inFlG. 2 operates as follows:
  • the aligning device is pressurized through device 14."
  • Piston 7 is displaced in direction x, until it touches the abutment pins 19 or until the fluid present in the chamber 17 prevents a to the accompanying drawings.
  • FIG. 3 A further versionof the aligning device is shown in FIG. 3.
  • This aligning device consists of two parallel arranged pressure rams 21 and 22, whose pressure medium inlets 23 and 24 are arranged so that, underpressure, the piston rod of the pressure ram 21 is extended, while the piston rod of the pressure ble-acting pressure ram, whose cylinder 25 is connected to the.
  • reservoirs are cylinders 30, 31 in each of which a free piston 4 32 or 33 is arranged to divide each cylinder into two partial chambers 34 and 35, or 36 and 37.
  • the partial chamber 34 of cylinder 30 is connected with the pressure chamber 27 of the double-acting pressure ram, while the partial chamber 36 is connected with the pressure chamber 28 of the double-acting pressure ram.
  • the free pistons and the partial chambers 34 and 36 act as fluid injection rams operated by a pressure medium supply 38 to the partial chambers 35 and 37.
  • the quantity of pressure medium inside the ram chambers 27 and 34 or 28 and 36 connected with each other is determined in-such a way, that the piston 29 and thus the leg 2 have their ideal position when the free pistons 32 and 33 are brought into their end position through pressure supply, i.e. untilthey touch the abutment-39 shown in FIG. 4.
  • a mine roof support comprising a roof-engaging member, a ground-engaging member, at least one extensible leg therebetween and articulated at its ends to said members, and a pressure-fluid-operable leg-aligning device, the improvements residing in that the device is positively connected at one end to the ground-engaging member, in that the, leg-aligning device is positively connected with the leg so as to move itin opposite directions, and in that the leg-aligning device comprises two 'rnean one of whichonpressurization extends the further movement of the piston 7 in direction x.
  • pressure fluid enters pressure chamber. 15 through the connecting'lines 16, and displaced the piston 19in dire'ctiony, until it touches the abutment pin 20 .or until the'fluidpresent in the chamber 18 prevents further movement in direction);
  • leg 2 when the pistons 7 and 9 are-extended or. retracted against their abutments, then leg 2 is in its intended position relative to the backwall 4 andthe box-typeibasev 1.-In this position the leg 2 is-reextended again-between roof and floor. After that the pressure medium supplyof the aligning device is switched off. If now, due to strata movements. adisplacemeritoccurs of legs 2 in direction x or in direction y, then the aligning device can yield correspondinglyin both directions with fluid "ex pelled through the over pressure valve. Adjustment of the in tended position of the leg 2 can be done by displacing thel:
  • abutment bolts 10 and 20 suitably, oralte'ring-the quantityo fluid in the chambers 17 and 18..
  • the bolt arrangement which is not shown in the drawing tcan'bealtered.
  • apressure fluid inlet is arranged simultaneously to pressurize the means with one acting to extend the device and the other to contract it whereby the device assumes a position of intermediate extension on pressurization.
  • a minero f s means is displaceable, th e,two. means serving-simultaneously to inject the contents of ,the reservoirs into theends of the cylinder ,the quantity of fluid in a reservoir and a respective i 1 end being complementary to the quantity of fluid in theo'ther...
  • w device c omprisesa double-actingpiston movable in a cylinder and wherein each endf'of the" cylinder has a fluid.
  • inlet con V 'nected to a fluid reservoir in which .a respective one-of said.
  • a mine roof support comprising a roof-engaging member, a ground-engaging member, at least one extensible leg therebetween and articulated at its ends to said members, and a pressure-fluid-extensible leg-aligning device, the improvements residing in that the device is positively connected at one end to the ground-engaging member and at the other end to the leg so that the device can move the leg in opposite directions, and in that the device comprises a hydraulically extensible means and a hydraulically contractable means connected to a common source of pressure fluid and arranged in mechanical series so that on pressurization the extensible means is fully extended and the contractable means fully contracted whereby the device adopts an intermediate position from which the device can be extended by external force by extending the contractable means and forcibly contracted by contracting the extensible means.
  • a mine roof support according to claim 5 wherein the two means comprise jointly two cylinders which are joined together and a ram piston in each cylinder, the pistons being connected one to the leg and the other to the base of the mine roof support.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Actuator (AREA)
  • Lining And Supports For Tunnels (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Fluid-Pressure Circuits (AREA)
US819782A 1968-09-05 1969-04-28 Mine roof supports Expired - Lifetime US3590586A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU56825 1968-09-05

Publications (1)

Publication Number Publication Date
US3590586A true US3590586A (en) 1971-07-06

Family

ID=19725711

Family Applications (1)

Application Number Title Priority Date Filing Date
US819782A Expired - Lifetime US3590586A (en) 1968-09-05 1969-04-28 Mine roof supports

Country Status (6)

Country Link
US (1) US3590586A (enrdf_load_stackoverflow)
JP (1) JPS493603B1 (enrdf_load_stackoverflow)
CS (1) CS170140B2 (enrdf_load_stackoverflow)
DE (1) DE1801564B1 (enrdf_load_stackoverflow)
GB (1) GB1225349A (enrdf_load_stackoverflow)
LU (1) LU56825A1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2924380A1 (de) * 1979-06-16 1981-01-08 Gewerk Eisenhuette Westfalia Hubbegrenzungsvorrichtung fuer schubkolbengetriebe, insbesondere fuer schreitund rueckzylinder fuer das ruecken eines foerderers und/oder eines schreitausbaus in bergbau-untertagebetrieben
DE102013107305B4 (de) 2013-07-10 2022-11-24 Herrmann Ag Hubeinrichtung und Hebebühne mit einer solchen Hubeinrichtung
CN113638753B (zh) * 2021-08-16 2024-01-05 哈尔滨学院 一种土木工程施工用支护结构

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2714505A (en) * 1948-05-01 1955-08-02 Joy Mfg Co Apparatus for mine roof control
US2859022A (en) * 1955-04-04 1958-11-04 Dowty Mining Equipment Ltd Hydraulic roof supports and conveyor feed jacks
US3169377A (en) * 1960-04-27 1965-02-16 Gewerk Eisenhuette Westfalia Base for mine props and the like
US3186178A (en) * 1960-09-09 1965-06-01 Gullick Ltd Roof supports for mines
US3192722A (en) * 1956-01-27 1965-07-06 Gewerk Eisenhuette Westfalia Mining support
US3218812A (en) * 1961-05-13 1965-11-23 Rheinstahl Gmbh Wanheim Mobile mine roof support
US3324664A (en) * 1964-04-03 1967-06-13 Gullick Ltd Resilient biasing device for mine roof support props
US3437010A (en) * 1966-02-17 1969-04-08 Oskar Jacobi Mine roof support means

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1001411A (en) * 1960-09-15 1965-08-18 Dowty Mining Equipment Ltd Roof supports suitable for use in mines
DE1126821B (de) * 1961-07-19 1962-04-05 Hemscheidt Maschf Hermann Ausbaugespann fuer die steile Lagerung
DE1257720B (de) * 1966-02-17 1968-01-04 Bergwerksverband Gmbh Steuerung fuer einen wandernden Ausbaurahmen

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2714505A (en) * 1948-05-01 1955-08-02 Joy Mfg Co Apparatus for mine roof control
US2859022A (en) * 1955-04-04 1958-11-04 Dowty Mining Equipment Ltd Hydraulic roof supports and conveyor feed jacks
US3192722A (en) * 1956-01-27 1965-07-06 Gewerk Eisenhuette Westfalia Mining support
US3169377A (en) * 1960-04-27 1965-02-16 Gewerk Eisenhuette Westfalia Base for mine props and the like
US3186178A (en) * 1960-09-09 1965-06-01 Gullick Ltd Roof supports for mines
US3218812A (en) * 1961-05-13 1965-11-23 Rheinstahl Gmbh Wanheim Mobile mine roof support
US3324664A (en) * 1964-04-03 1967-06-13 Gullick Ltd Resilient biasing device for mine roof support props
US3437010A (en) * 1966-02-17 1969-04-08 Oskar Jacobi Mine roof support means

Also Published As

Publication number Publication date
GB1225349A (enrdf_load_stackoverflow) 1971-03-17
JPS493603B1 (enrdf_load_stackoverflow) 1974-01-28
LU56825A1 (enrdf_load_stackoverflow) 1970-03-05
DE1801564B1 (de) 1970-07-30
CS170140B2 (enrdf_load_stackoverflow) 1976-08-27

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