Telescoping Patents (Class 405/294)
  • Patent number: 9234425
    Abstract: A system for enabling movement of a machine is provided. The system includes a support member provided on the machine. The support member is configured to be in a raised position or a lowered position relative to a frame of the machine. The system also includes an actuation module configured to selectively enable the movement of the machine. The system further includes an enabler valve coupled to the actuation module and the support member. The enabler valve is configured to selectively send a pilot signal to the actuation module based on the position of the support member.
    Type: Grant
    Filed: June 12, 2013
    Date of Patent: January 12, 2016
    Assignee: Caterpillar Global Mining America LLC
    Inventor: Jeffrey D. Looney
  • Patent number: 8985699
    Abstract: Methods and equipment have been developed that combine the use of continuous miners, flexible conveyor trains, and longwall mining techniques to provide flexible and efficient removal of resources from subterranean formations. Some mining operations use a powered roof support comprising: a canopy configured to directly contacts a roof of a mine; a base configured to rest on a floor of the mine, the base comprising a spill plate and a push cylinder with a maximum stroke greater than 11 feet; and a pair of hydraulic legs attaching the canopy to the base.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: March 24, 2015
    Assignee: Seneca Industries Inc.
    Inventors: Timothy J. Myers, Michael Cline, John Dickinson
  • Patent number: 8985700
    Abstract: Methods and equipment have been developed that combine the use of continuous miners, flexible conveyor trains, and longwall mining techniques to provide flexible and efficient removal of resources from subterranean formations. Some systems for use in a mining operation include: a continuous miner configured to cut material from a face; a plurality of powered roof supports positioned along the face; and a guidance system operable to receive a location signal based on relative location of the continuous miner along the face and to send a control signal to the plurality of powered roof supports positioned along the face.
    Type: Grant
    Filed: May 1, 2014
    Date of Patent: March 24, 2015
    Assignee: Seneca Industries Inc.
    Inventors: Timothy J. Myers, Michael Cline, John Dickinson
  • Patent number: 8821075
    Abstract: A yield support prop for a mine includes a first metal tube extending from the mine floor having a first portion having a first outside diameter and a second portion having a second outside diameter. The prop includes a second metal tube that is disposed about the first portion and extends toward the mine roof, when the second tube receives a load from the mine roof, the second portion deforms the second tube and expands the second tube creating resistance against the load from the mine roof. A method for supporting a mine roof. A method for building a yieldable mine prop.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: September 2, 2014
    Assignee: Strata Products Worldwide LLC
    Inventors: Clifford A. McCartney, Thomas P. O'Donnell
  • Patent number: 8430604
    Abstract: A shield support assembly for underground mining includes a shield canopy and at least one floor runner as supporting surface elements. The shield canopy and at least one runner are connected in an articulated manner and can be pressed against rock at least one hydraulic cylinder which is supported in bearing pans on the shield canopy and floor runner. Each surface supporting element includes a welded construction of welded-together components. In order to be able to support higher forces without increasing the overall weight, at least one of the supporting surface elements includes at least one hollow metal box profile filled with a solid as a component of the welded construction.
    Type: Grant
    Filed: June 16, 2009
    Date of Patent: April 30, 2013
    Assignee: Caterpillar Global Mining Europe GmbH
    Inventor: Siamak Onsori
  • Patent number: 8371658
    Abstract: A mine rib support for bracing a vertical mine rib disposed between a mine floor and a mine roof. The support includes an elongated upright and continuous telescopically expandable support having a preset curvature. The member is longitudinally expanded for engaging the mine floor and the mine roof under compression with the curvature facing towards the mine rib. A support plate is laterally extended from the support member into compression engagement with the mine rib, thereby prestressing the support for support of the mine rib.
    Type: Grant
    Filed: May 10, 2010
    Date of Patent: February 12, 2013
    Assignee: Heintzmann Corporation
    Inventors: John J. Breedlove, Erik Denver, Herbert B. Stiltner
  • Patent number: 8297888
    Abstract: A hydraulic prop 1 is provided for use in underground mining and tunnel construction and is to be used above all in the shield support. In this shield support or in the hydraulic prop 1, the exterior pipe 15 having the foot connection part 16 and the handle 17 and the interior pipe 19 having the head plate 20 are effectively connected together via spring steel wire ties 35 which are disposed or are to be disposed in corresponding connecting grooves 36, 37, 38 or 39, 40 41 such that in the transition region 42 sufficiently high forces can be transferred so as to ensure a connection between the components which is effective and remains effective. A setting pressure of 600 t can be realized at about 700 bar with the corresponding equipment. The connecting technique permits the use of high-strength thinner-walled pipes.
    Type: Grant
    Filed: April 9, 2008
    Date of Patent: October 30, 2012
    Inventor: Wolfgang Voss
  • Patent number: 8052352
    Abstract: A mine support yieldable prop includes a threaded shaft rotatably mounted in an end of the prop to move into and out of the prop end to move a bearing plate toward or away from a mine roof, and/or a bearing plate pivotally mounted to the end of the prop to level the prop with uneven mine roofs.
    Type: Grant
    Filed: April 2, 2007
    Date of Patent: November 8, 2011
    Assignee: FCI Holdings Delaware, Inc.
    Inventors: Wallace Bolton, Demrey G. Brandon, Ben Mirabile, John G. Oldsen, John C. Stankus, Rodney Poland
  • Patent number: 7883298
    Abstract: In a supporting device (2) for an advance working or mining machine (1), including support props (3) and at least one roof bar (4), the roof bar(s) (4), on their sides facing away from the support props (3), include(s) a plurality of support cylinders (5) with support stops, which can be separately braced against the roof.
    Type: Grant
    Filed: July 20, 2007
    Date of Patent: February 8, 2011
    Assignee: Sandvik Mining and Construction G.m.b.H.
    Inventor: Erich Brandl
  • Patent number: 7717649
    Abstract: A suspending hydraulic pillar includes an oil cylinder, a movable prop, a handle-valve body, a reset spring, a top cover, a bottom seat, a three-way valve, a position-limiting steel wire, and a guide ring. The handle-valve body is provided between a port of the oil cylinder port and the moveable prop. Position-limiting steel wire, a guiding ring, and an oil inlet is located on a lower part of the moveable prop. The three-way valve is provided in the handle-valve body. A dust-prevention ring and a sealing ring are provided between the handle-valve body, the movable prop, and the oil cylinder. The handle-valve body is fixed on the oil cylinder by means of a connecting steel wire. The handle-valve body does not move up and down as the movable prop telescopically extends or contracts. The suspending hydraulic has good stability, high strength and supporting force, good sealing, and high anti-erosive capability.
    Type: Grant
    Filed: December 31, 2005
    Date of Patent: May 18, 2010
    Assignee: China University of Mining and Technology
    Inventors: Bingwen Li, Jiyun Zhao, Qiguang Wang, Shiqi Chen, Jianwu Wang, Weimin Chen
  • Publication number: 20040258487
    Abstract: A hydraulic shield support is disclosed with at least two adjustable-length hydraulic props supporting a dedicated shield, which are connected through a control bank to a hydraulic fluid supply and borne on base shoes, and to which a pressure in excess of the pressure of the hydraulic fluid may be applied in the set condition of the shield support. In order to provide almost any pressure level at each shield support at a deep face in a simple way, the shield support has at least one pressure intensifier located in a hydraulic pipe system between the hydraulic fluid supply and the hydraulic props, with an oscillating intensifier piston in the form a differential piston effecting the increase in pressure. The low pressure inlet of the pressure intensifier is connected to the setting pressure pipes upstream, and its high-pressure outlet downstream, of a hydraulically-releasable non-return valve.
    Type: Application
    Filed: June 22, 2004
    Publication date: December 23, 2004
    Applicant: DBT GmbH
    Inventors: Franz-Heinrich Suilmann, Friedrich Wilhelm Dannehl, Michael Dettmers, Werner Reinelt
  • Publication number: 20040223815
    Abstract: A yieldable prop having a first end and a second end includes a first hollow conduit, a second conduit slidably received in the first hollow conduit, and a clamp assembly positioned adjacent the juncture of the first hollow conduit and the second conduit. A yield section is provided at the end of the first and/or second conduits, or at the juncture of the first and second conduits. The yield section includes a shroud spaced from an inner pipe to provide a space to receive a collapsible insert. An end of a conduit is positioned in the space and compresses the insert when the compressive load on the prop exceeds the compressive load capacity of the insert.
    Type: Application
    Filed: June 2, 2004
    Publication date: November 11, 2004
    Applicant: Jennmar Corpotation
    Inventors: John C. Stankus, John G. Oldsen
  • Publication number: 20040081518
    Abstract: A yieldable prop having a first end and a second end including a first hollow conduit, a second conduit slidably received in the first hollow conduit, a clamp assembly positioned adjacent to the first hollow conduit and the second conduit, a ring positioned around the first hollow conduit, and at least one handle connected to the first hollow conduit and the ring. The clamp assembly includes a housing and a wedge. The prop further includes a bearing plate positioned at the first end of the yieldable prop, wherein the bearing plate is selected from a shape comprising planar and volcano.
    Type: Application
    Filed: October 17, 2003
    Publication date: April 29, 2004
    Applicant: Jennmar Corporation
    Inventors: John C. Stankus, John G. Oldsen
  • Publication number: 20030194280
    Abstract: A yielding column for support mine roofs or the like includes a tube provided with one or more circumferential rows of slots which provide a preferred locus for buckling. A reinforcing sleeve within the tube prevents inward buckling, so that the buckled portions are easily seen.
    Type: Application
    Filed: April 16, 2002
    Publication date: October 16, 2003
    Inventor: W. David Calhoun
  • Patent number: 6612782
    Abstract: A telescoping tube for supporting surrounding walls of a shaft during the rescue of a victim trapped at the bottom of the shaft. The tube has nesting interlocking successive sections, each successive section having a diameter smaller than the preceding section. Each section has a top edge and a bottom edge. A bottom rim oriented inward extends around the bottom edge perimeter of each section. A pair of top lips oriented outward extend outward from opposite quadrants of the perimeter of the top edge of each section. When the telescoping tube is extended downward, the top lips of the sections rest upon the bottom rim of the preceding sections. In order to collapse the tube, the sections are pulled upward into the preceding sections, thereby bringing the top lips of the sections into contact with the bottom rim of the preceding sections.
    Type: Grant
    Filed: April 12, 2002
    Date of Patent: September 2, 2003
    Inventor: James Tengan
  • Publication number: 20030161693
    Abstract: A yieldable prop having a first end and a second end including a first hollow conduit, a second conduit slidably received in the first hollow conduit, a clamp assembly positioned adjacent to the first hollow conduit and the second conduit, and at least one handle connected to the first hollow conduit and the clamp assembly. The prop further includes a bearing plate positioned at the first end of the yieldable prop, wherein the bearing plate is selected from a shape comprising planar and volcano.
    Type: Application
    Filed: February 21, 2003
    Publication date: August 28, 2003
    Inventors: John C. Stankus, John G. Oldsen, Demrey G. Brandon
  • Patent number: 6056481
    Abstract: According to the invention, monitoring the load on hydraulic powered shield supports in underground use is performed by using the controller (13) serving for extraction control, which is equipped with microelectronics for load monitoring and load control, the components of the powered shield support being assigned sensors (14 to 18) whose electric measured values are used by the controller (13) for evaluating the measured signals and for driving the hydraulic rams (6, 7) and/or the angle cylinder (11) assigned to the powered shield support. The load control is preferably designed here in such a way that the critical load situations "one-sided loading" and/or "tip-toeing" are detected as early as during the setting operation, with the aid of appropriate sensors, and are rendered non-damaging in their effect by appropriately driving the hydraulic rams and/or the angle cylinder.
    Type: Grant
    Filed: September 4, 1997
    Date of Patent: May 2, 2000
    Assignee: DBT Automation GmbH
    Inventors: Willy Watermann, Walter von der Linden, Wilfried Weigel
  • Patent number: 5626441
    Abstract: A sliding stabilizer is a machine for supporting the roof in the working zone of a mine. A sliding stabilizer operates in tandem with a mining roof support machine. A sliding stabilizer is capable of supporting the mine roof independently of the roof support machine. A sliding stabilizer has a peak roof covering, a flexible sheet that extends toward the roof covering of a support machine, and a rotating retractable leg. The retractable leg rotates from the mineral seam to inside the roof covering of a support machine. The retractable leg propels the peak into the working zone of the shearer. A sliding stabilizer supports a previously insupportable roof.
    Type: Grant
    Filed: July 7, 1995
    Date of Patent: May 6, 1997
    Inventor: Boris Grebenyuk
  • Patent number: 5000622
    Abstract: A shaking control unit for a hydraulic cylinder, wherein a first predetermined pressure is admitted to the piston space of the cylinder through a first hydraulic line. A three/two-way valve connects in its zero position a second hydraulic line to a return tank, the second hydraulic line being connected to the first hydraulic line through a check valve. A first control line leads from the first hydraulic line to a first control area of the three/two-way valve. A second control line leads from the second hydraulic line to a second control area of the three/two-way valve. The three/two-way valve is constructed in such a way that, when the pressure in the first hydraulic line reaches a second predetermined pressure which is greater than the first predetermined pressure, the three/two-way valve switches and connects the first hydraulic line to the second hydraulic line. If the piston of the hydraulic cylinder meets an obstacle, the pressure in the first hydraulic line rises above a certain limit value.
    Type: Grant
    Filed: November 21, 1989
    Date of Patent: March 19, 1991
    Assignee: Bochumer Eisenhutte Heintzmann GmbH & Co. KG
    Inventor: Siegmar Block
  • Patent number: 4900091
    Abstract: A mining system comprises a laterally deflectable segmented conveyor extending longitudinally along a longitudinal face from which material is to be cut, a mining machine displaceable longitudinally along the conveyor and engageable with the face to cut material therefrom and deposit in the conveyor, and a longitudinal succession of support frames each having a respective actuator connected to a respective segment of the conveyor and each also having a respective a respective retractile roof-engaging flap. The process of this invention comprises bracing the frames and conveyor in a safety zone immediately adjacent the mining machine against the roof with their flaps retracted. The machine is advanced in the safety zone while cutting the face in the safety zone, and the flaps of the frames in a zone immediately downstream of the safety zone are sequentially retracted and the flaps of the frames in a zone upstream of the safety zone are sequentially advanced.
    Type: Grant
    Filed: September 9, 1988
    Date of Patent: February 13, 1990
    Assignee: Bochumer Eisenhutte Heintzmann GmbH & Co. KG
    Inventors: Gustav Neu, Ernst-Gunter Nerlich, Karl-Heinz Berger
  • Patent number: 4798417
    Abstract: A method in underground coal mining for separating the upper coal of the seam from the roof during the advancement of the upper sliding cap of a support frame, wherein the front edge of the cap is forced in a plane of the cap between the upper coal to be separated and the rock from which the coal is to be separated. During the advancement of the sliding cap, the sliding cap is alternatingly moved backwardly and forwardly, so that the from edge of the sliding cap separates the upper coal during its forward movement. Alternatively or additionally, when the front edge of the sliding cap contacts the upper coal, alternatingly higher and lower pressure can be admitted to the sliding cap in order to obtain a shaking effect. In this combined method, the sliding cap is advanced, the shaking procedure is carried out as the front edge contacts the upper coal, and the sliding cap is subsequently moved backwardly. The cycle is then repeated several times.
    Type: Grant
    Filed: September 14, 1987
    Date of Patent: January 17, 1989
    Assignee: Bochumer Eisenhutte Heintzmann GmbH & Co. HG
    Inventors: Gunter Blumenthal, Gustav Neu, Karl-Heinz Berger, Siegmar Block
  • Patent number: 4755084
    Abstract: A mine roof support has a slidable extension at the front end of an auxiliary roof cap pivoted for swinging up and down on a main cap. To prevent the extension from being extended when the angle of inclination of the auxiliary cap is too high an insulative cylindrical block is fitted to say the auxiliary cap to partially rotate as the auxiliary cap pivots. A flattened region on the block supports a metallic plate and indexes as the auxiliary cap pivots. A resiliently-mounted proximity switch on the main cap senses the presence of the plate and produces a signal to prevent the extension from being extended.
    Type: Grant
    Filed: February 11, 1987
    Date of Patent: July 5, 1988
    Assignee: Gewerkschaft Eisenhutte Westfalia GmbH
    Inventors: Bernd Peters, Harry Rosenberg, Walter Weirich
  • Patent number: 4718793
    Abstract: A generator for dynamic loading of a mine lining simulates an unstable ground structure, such as a "bump" of the formation roof by an explosion of an explosive. The generator /3/ comprises a cylinder /6/ with a piston /7/, the said piston functioning as a percussion member. The bottom of the cylinder /6/ is provided with symmetrical chambers /10/ to place an explosive. The explosive is batched to each of chambers /10/ through holes /8, 9/ made in the flank of the cylinder /6/. Holes /8, 9/ are bored at an angle enabling gravitational filling of the chamber /10/ with an explosive already after initial spragging of the lining section /1/ under test between the floor /2/ and the generator /3/ abutting the roof /5/ of the test-stand. The cylinder /6/ is closed with a limiter /12/ of the stroke of the piston. Between the piston /7/ and the limiter /12/ of its stroke there is a shock-absorbing washer /13/. In the limiter /12/ there are additional holes for release of powder gases.
    Type: Grant
    Filed: January 7, 1986
    Date of Patent: January 12, 1988
    Assignees: Gwarectwo Mechanizacji Gornictwa "POLMAG", Centrum Mechanizacji Gornictwa "KOMAG"
    Inventors: Waclaw Warachim, Wojciech Skoczynski, Jan Debiec, Hubert Niesyto, Marek Wojtaszczyk, Edward Wlodarczyk, Roman Krzewinski, Mieczyslaw Zielinski, Kazimierz Kowalczyk, Andrzej Spychala
  • Patent number: 4693640
    Abstract: A method of controlling a plurality of hydraulically-actuated arrangements in underground excavations, comprises the steps of providing an electrical power supply, connecting a plurality of control devices with said power supply and interconnecting the control devices with one another, arranging a plurality of current-suppliable consumers to be connected with the control devices, comparing in each of the control devices a coded information about a number of consumers which have been current supplied from the power supply with a maximum possible number of consumers which can be supplied from the power supply, determining from the comparison the number of the consumers which still can be current-supplied and obtaining by the control device a release for current supplying such consumers, adding consumers which are released by the control device and current supplied with the consumers which have been indicated in the control device as current-supplied, and further transferring the result of the addition in coded
    Type: Grant
    Filed: August 5, 1986
    Date of Patent: September 15, 1987
    Assignee: Bochumer Eisenhutte Heintzmann GmbH & Co KG
    Inventor: Karl-Heinz Berger
  • Patent number: 4657443
    Abstract: An arrangement for supervising and controlling synchronous displacement of respective pistons of two cylinder-and-piston units, especially of an advancement and a roof cap displacement unit of a roof support assembly for use in underground mining, comprises first and second conduit systems each having two branches each connected with one of the piston and annular spaces of a different one of the units; a switching valve interposed between pressure and a return conduits and the first and second conduit systems; and first and second shut-off valves respectively interposed in those of the branches of the first and second conduit systems which lead to the piston spaces.
    Type: Grant
    Filed: March 11, 1986
    Date of Patent: April 14, 1987
    Assignee: Bochumer Eisenhuette Heintzmann GmbH & Co.
    Inventor: Gunter Blumenthal
  • Patent number: 4548527
    Abstract: A roof support suitable for use in mines comprises a main roof-supporting structure, a cantilever carried by the structure, an actuator and a link member through the intermediary of which the actuator is connected to one end portion of the cantilever for moving the cantilever between retracted and extended positions. The end portion of the cantilever has projections which come into engagement with an abutment when, upon advancing movement of the actuator, the cantilever reaches its fully extended position. The abutment and projections are so shaped that when they are in engagement they form pivot means about which the cantilever can be tilted. The link member is so formed and so connected to the cantilever that upon further advancing movement of the actuator the cantilever is caused to tilt about the pivot means into a roof-supporting position.
    Type: Grant
    Filed: June 21, 1984
    Date of Patent: October 22, 1985
    Assignee: Dowty Mining Equipment Limited
    Inventors: Christopher J. Bishop, Geoffrey M. Cumner, John H. Waters
  • Patent number: 4534681
    Abstract: A mine roof support has a main roof-engaging structure 2 carried by hydraulic props 6 in known manner and an auxiliary roof-engaging structure at the front end of the main roof engaging structure. The auxiliary roof-engaging structure can be swung up and down and is itself of multi-part construction with one component 7 directly linked to the main structure and another selectively extendible forward component 8 mounted to the one component. One hydraulic piston and cylinder unit 9 is provided for swinging the auxiliary structure and for setting the structure against the roof and another such unit 10 is provided for selectively extending and retracting the forward component thereof. A hydraulic control arrangement 16-18 associated with the units ensures that when the forward component is being advanced the roof setting pressure acting on the auxiliary structure is automatically reduced.
    Type: Grant
    Filed: September 21, 1983
    Date of Patent: August 13, 1985
    Assignee: Gewerkschaft Eisenhutte Westfalia
    Inventors: Walter Weirich, Michael Dettmers
  • Patent number: 4492495
    Abstract: A mine roof support includes a roof-engageable beam which comprises a main portion and a further portion which forms an extension of the main portion. The further portion is hinged to the main portion by a pin-less knuckle joint. The further portion includes a part which projects beyond the knuckle joint and beneath the underside of the main portion with which it is engageable to limit pivotal movement of the further portion about the joint. Retaining means provide security of connection of the further portion to the main portion. Means are provided either beneath the main portion or beneath the further portion which are operative upon the further portion for tilting it about the knuckle joint.
    Type: Grant
    Filed: June 13, 1983
    Date of Patent: January 8, 1985
    Assignee: Dowty Mining Equipment Limited
    Inventors: Dennis F. Rutherford, Keith D. Blackmore
  • Patent number: 4491441
    Abstract: A self-advancing support, suitable for use in mines, includes a cantilever which is extendible and retractable with respect to a main portion of the support, and a sprag which is so mounted on said cantilever as to be extendible and retractable with respect thereto. Means are provided for advancing the support with respect to a mineral face and further means are provided for ensuring that during advance of the support the sprag is maintained in an extended, mineral-face-engaging, condition while the main portion is moved with respect to the cantilever in the direction towards the face, thereby reducing cantilever extension.
    Type: Grant
    Filed: October 13, 1983
    Date of Patent: January 1, 1985
    Assignee: Dowty Mining Equipment Limited
    Inventors: Freeman, Reginald E., Alan J. Berry
  • Patent number: 4427321
    Abstract: A longwall mineral mining installation has a conveyor and a plurality of roof support units positioned side-by-side on the goaf side of the conveyor. Each roof support unit has a roof shield having an advanceable shield extension. Each unit has a first hydraulic ram for extending its shield extension, and a second hydraulic ram for advancing the conveyor. The extension of each first ram is controlled in dependence upon the retraction of one of the second rams (either the second ram of the same unit or that of an adjacent unit). This control is effected by controlling the supply of pressurized hydraulic fluid to the first rams. In one embodiment this is carried out by a control valve which has a spring-loaded plunger which engages with a series of equispaced cams on the movable cylinder of the associated second ram. In another embodiment, the piston rods of the rams are provided with series of equispaced magnets.
    Type: Grant
    Filed: September 28, 1981
    Date of Patent: January 24, 1984
    Assignee: Gewerkschaft Eisenhutte Westfalia
    Inventors: Walter Weirich, Harry Rosenberg, Kunibert Becker
  • Patent number: 4411558
    Abstract: A roof support including a roof-engageable member and a cantilever member, one having parallel elongate compartments with a cover member which has a roof-engageable surface and which overlies the compartments, and the other having parallel and rigid elongate elements slidably fitting into the compartments. The other member also includes a plate, having a roof-engageable surface, which defines the profile in plan of that member and which is so secured to the elements as to be relatively slidable with respect to the roof-engageable surface of the cover member. The transverse widths of the roof-engageable surfaces are such that when the roof-engageable member and the cantilever member are caused by actuator means relatively to slide from a retracted condition to an extended or partially-extended condition one of those surfaces effectively forms a full width extension of the other.
    Type: Grant
    Filed: November 4, 1981
    Date of Patent: October 25, 1983
    Assignee: Dowty Mining Equipment Limited
    Inventor: Dennis F. Rutherford
  • Patent number: 4310268
    Abstract: This invention relates to a face sprag for mining equipment, to a mine roof beam incorporating such a sprag and to a mine roof support provided with such a beam. The face sprag comprises a sprag plate, a piston and cylinder unit pivotally attached at one end about a first pivot axis to the sprag plate and at the other end about a second pivot axis to a portion of a support member, a link means pivotally attached at one end about a third pivot axis to the piston and cylinder unit and at the other end about a fourth pivot axis to the support member at a location spaced from the second pivot axis, all the pivot axes being parallel, and activation of the piston and cylinder unit urging the sprag plate, in use, into an operative position in engagement with the mineral face.
    Type: Grant
    Filed: July 3, 1979
    Date of Patent: January 12, 1982
    Assignee: Fletcher Sutcliffe Wild Limited
    Inventors: Lewis R. Bower, Arthur Scarfe
  • Patent number: 4309130
    Abstract: A mine roof support has two sole-sliding elements, a bridge element connecting the sole-sliding elements with one another at the mine face ends of the latter, a roof supporting element supported on the sole-sliding elements, props supporting the roof supporting element on the sole-sliding elements, a displacing arrangement for displacing the sole-sliding elements and connected with the bride element, a guiding arrangement located between the sole-sliding elements and including two laterally spaced guiding rods connected at their mine face ends with a support element and at their backfilling ends with the bridge element via displacing arrangement, wherein a carriage is positively incorporated between the guiding rods of the guiding arrangement. The carriage carries a cylinder-and-piston unit which connects the carriage with the guiding arrangement at the backfilling end of the latter.
    Type: Grant
    Filed: June 3, 1980
    Date of Patent: January 5, 1982
    Assignee: Bochumer Eisenhutte Heintzmann GmbH & Co.
    Inventor: Hans-Ferdinand Bemmerl
  • Patent number: 4309131
    Abstract: A mine roof support has a base, a supporting prop extending upwardly from the base, an elongated roof-supporting element having one portion supported by the supporting prop and another portion telescopable relative to the one portion toward a mine face and having a free end formed as a housing with a width corresponding to the width of the one portion, and a thrust prop arranged to support the free end section of the telescopable portion of the roof-supporting element and having a roof-side end section which is forcedly displaceable in the housing in direction of elongation of a mine and pivotable in a substantially vertical plane about an axle arranged in the housing.
    Type: Grant
    Filed: July 2, 1980
    Date of Patent: January 5, 1982
    Assignee: Bochumer Eisenhutte Heintzmann GmbH & Co.
    Inventor: Alfred Bollmann
  • Patent number: 4307981
    Abstract: A longwall mineral mining installation has a conveyor and a plurality of roof support units positioned side-by-side on the goaf side of the conveyor. Each roof support unit has a roof shield having an advanceable shield extension. Each unit has a first hydraulic ram for extending its shield extension, and a second hydraulic ram for advancing the conveyor. The extension of each first ram is controlled in dependence upon the retraction of one of the second rams (either the second ram of the same unit or that of an adjacent unit). This control is effected by controlling the supply of pressurized hydraulic fluid to the first rams. In one embodiment this is carried out by a control valve which has a spring-loaded plunger which engages with a series of equispaced cams on the movable cylinder of the associated second ram. In another embodiment, the piston rods of the rams are provided with series of equispaced magnets.
    Type: Grant
    Filed: May 2, 1980
    Date of Patent: December 29, 1981
    Assignee: Gewerkschaft Eisenhutte Westfalia
    Inventors: Walter Weirich, Harry Rosenberg, Kunibert Becker
  • Patent number: 4306822
    Abstract: Hydraulic control means are provided for controlling an auxiliary shield positioned at one side of the roof shield of a mine roof support unit. The auxiliary shield is moved laterally of its roof shield by means of three hydraulic rams and the roof shield is supported by hydraulic props. The hydraulic control means comprises a control valve device and two pilot check valves. One pilot check valve is positioned in a line leading from the control valve device to two hydraulic rams which act in tandem. The other pilot check valve is positioned in a line leading from the control valve device to the other hydraulic ram. The pilot check valves are actuated in dependence upon the pressurization of the hydraulic props whereby the hydraulic rams are depressurised when the props are pressurized and vice versa.
    Type: Grant
    Filed: July 26, 1979
    Date of Patent: December 22, 1981
    Assignee: Gewerkschaft Eisenhutte Westfalia
    Inventors: Walter Weirich, Harry Rosenberg
  • Patent number: 4269546
    Abstract: The invention relates to mine working apparatus including a sprag plate 21. The sprag plate 21 is included in a sprag unit 20 that can be reciprocated in the fore-and-aft direction of the canopy and the sprag unit 20 includes a sprag slide 22 and a link system 43 and 61 that can be reciprocated in the fore-and-aft sense relatively to each other. There is a range of lost motion between the slide 22 and the link system and the means 48 for moving the sprag unit between the position in which the sprag plate 21 is operative and the position in which the sprag plate 21 is inoperative also moves the sprag slide and the link system relatively to each other through their range of lost motion and this relative movement swings the sprag plate 21 between a generally upright, operative, position and a generally horizontal, retracted, position.
    Type: Grant
    Filed: June 4, 1979
    Date of Patent: May 26, 1981
    Assignee: Huwood Limited
    Inventor: Graham J. Saunders
  • Patent number: 4122682
    Abstract: A method of applying a protective wire mesh mat to the undersurface of the roof of an underground mine working and apparatus for applying such mat wherein a coil of the mat is carried on a supporting spindle and is paid out against the undersurface of the roof through a vertically convergent passageway defined by upper and lower jaw plates of an applicator. The applicator has an open side through which the margin of the last applied strip passes so as to be in overlapped or edge to edge relation with the mat strip undergoing application. A coil of fastening strip incorporating staple-like fastening elements is also carried by the apparatus and paid out through the applicator passageway in overlapped relation with the two mat strips and is caused by the convergence of the jaw members firstly to penetrate the two mat strips and then undergo downward bending of the prongs of the staple-like fastening elements before passing out of the exit of the convergent passageway.
    Type: Grant
    Filed: July 29, 1977
    Date of Patent: October 31, 1978
    Inventor: Karl M. Groetschel
  • Patent number: 4119346
    Abstract: This mining system utilizes a row of roof support units in conjunction with a row of conveyor sections and a continuous mining machine which rides on the conveyor sections. Each roof support includes a primary support shield supported on a base by means of jacks and a secondary support shield telescopically mounted to the primary support shield and having a wall engagement portion at the outer end to provide bearing support for the secondary support shield by the wall rather than merely by cantilever support. Each support unit is connected to an associated conveyor unit by a ram for moving said units relative to each other. The mining machine includes a kerf cutting member for creating a continuous ledge at the junction of the longwall and roof for supporting the secondary support shield wall engagement portion.
    Type: Grant
    Filed: May 2, 1977
    Date of Patent: October 10, 1978
    Assignee: M.A.T. Industries, Inc.
    Inventor: Michael J. Amoroso