US3739586A - Self-advancing coal face support system - Google Patents

Self-advancing coal face support system Download PDF

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US3739586A
US3739586A US00258867A US3739586DA US3739586A US 3739586 A US3739586 A US 3739586A US 00258867 A US00258867 A US 00258867A US 3739586D A US3739586D A US 3739586DA US 3739586 A US3739586 A US 3739586A
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shield
support
shields
coal face
support system
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US00258867A
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K Wehner
W Watermann
G Bell
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Kloeckner Werke AG
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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
    • E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
    • E21D23/0445—Extensions of the base member supporting the conveyor
    • 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
    • E21D23/0004—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor along the working face
    • E21D23/0034—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor along the working face comprising a goaf shield articulated to a base member
    • E21D23/0039—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor along the working face comprising a goaf shield articulated to a base member and supported by a strut or by a row of struts parallel to the working face

Definitions

  • a self-advancing coal face support system includes support shields arranged side-by-side, each support shield comprising a front roof shield, a caving shield, a packing shield and a floor sill pivotally connected together.
  • Each support shield is movable relative to a supporting frame for the face conveyor by means of hydraulic cylinders, the floor sill including a tapered front end por tion which engages bearers on the frame.
  • the packing shield and the caving shield both include laterally mov-' able side shields movable under the action of hydraulic thrust pistons when a correction is to be effected in the direction of advance of the support system.
  • a coal face support system of this kind operates like a coal face support system with jacks.
  • each shield After the passage of a winning machine, which may be guided, for example, on the supporting frame or on the channel structure of a face conveyor laid on the supporting frame, each shield advances in each case in accordance with the relief of the load on the props supporting the caving shield and in so doing uses the supporting frame as an abutment.
  • these cylinders exert the necessary bearing pressure for the face conveyor and/or the winning machine on the abutment.
  • Support shields of the kind mentioned at the beginning are particularly stable; they are therefore suitable in particular for the mining of thick seams with correspondingly high seam openings.
  • Support shields with comparatively'short floor sills are known (Spruth Strebausbau in Stahl undLeichtmetall (Coal Face Supports in Steel and Light Metal) 1963, p. 198, FIG. 177). They require, inter alia, frontal area roof bars carried by special props and keep open a coal face space which has a comparatively small cross-section. This is not sufficient for the large amounts of air which are required for efficient mining systemsfln addition, it is a disadvantage thatin consequence of the small length of the floor sills portions of the shifting cylinders are located outside the open coal face space.
  • Support shields of the kind mentioned at the beginning are likewise known from Offenlegungsschrift No. 1958322. These shields have relatively long floor sills. This'is the reason not only for their stability, but also for the size of the face space kept open by them, which is adequate for efficient mining. On the other hand, the support shields are lacking in all facilities for excluding the penetration of rubble into the face space between the shields. The support shields must therefore be immediately adjacent one another.
  • support shields are also known which consist of an inclined caving shield and a head plate serving to support the still unbroken coal face roof (Journal Glueckier" 103 (1967), No. 20, pp. 1013 to 1014).
  • a support shield of this kind keeps open a coal face space which is comparatively small and of inadequate size for modern winning systems, it is provided on one side with movable side shields supported on side shields corresponding to them and which are fixed to the neighboring support shield.
  • the movable side shields are supported resiliently by means of a telescopic guide onthe caving shield and are thereby so biased that they are applied so firmly against the corresponding fixed side shields of the neighboring support frame that a reliable seal is produced.
  • the principal object of the present invention is the provision of support shields with means for correction of their direction of advance without changes in the basic structure of such shields and in particular the endangering of the seal against the penetration of rubble or stowing material becoming necessary for this purpose.
  • the floor sills of the support shields have sections the longitudinal sides of which are supported against the associated bearers, the front and rear end of each floor sill being tapered and the packing shield and the caving shield being provided adjacent the rear end of the floor sill with laterally movable shields which are supported on corresponding side shields of the respective support. shield and screen the coal face space against the penetration of rubble.
  • the movable side shields are supported on hydraulic thrust piston drives to which pressure can be admitted to swing the support shields when a correction of the direction of advance is required.
  • the invention provides a shield support system for coal face spaces of large cross-section, and thereby for efficient mining systems, with reliable sealing against the penetration of rubble with the aid of side shields which, inconsequence of their support on thrust piston drives, perform an additional function.
  • This consists in swinging the rear end of a support shield by retracting or extending the thrust pistons and in this way producing a correction of the direction of advance of the supportshields.
  • This swinging movement is rendered possible by the tapering of the ends of-the floor sills and is effected without the sealing of the face space being lost. This movement therefore cannot be blocked by loose rock in the face space.
  • each support shield which is supported by means of its longitudinal sides against the associated bearers therefore only needs to be long enough to be able to accommodate the props or rams supporting thecaving shield, because the guiding func tion of the bearers is supplemented by the guiding action which is produced by theside shields.
  • FIG. is a plan view of the floor sills of two support shields with a conveyor supporting frame.
  • the coal face support system shown in the drawings includes support shields each of which has a front roof shield 1 supporting the still unbroken roof zone.
  • This roof shield is articulated to a caving shield 2 at 3 and the caving shield is attached in turn at 4 by means of ajoint to a packing shield 5.
  • the packing shield is connected immovably by means of transverse bolts 6 and 7 to a floor sill designated generally by the reference 8. Hydraulic rams act between the floor sill 8 and the caving shield 2.
  • the support system can be advanced by using a'supporting frame 10 extending along the coal face (not shown) as an advanceable abutment; with reverse admission of pressure to the shifting cylinder or cylinders 9, a face conveyor 11 laid on the supporting frame 10 is held against the coal face with the necessary contact pressure.
  • the supporting frame 10 consists of individual sections 14 and 15 which are articulated to one another by means of ball-and-socket joints 16 so that they are swingable horizontally and vertically. These sections have the same length as the sections of the channel structure of the conveyor 11.
  • the support shield floor sills have intermediate sections 21 and 22. At the longitudinal sides of these sections there are ridges 23 and 24, respectively, which are supported on the respective longitudinal sides of the bearer 20. Adjacent the sections 21 and 22 at the front are the floor sill ends 13 which are introduced into the openings 12 in the frame sections 14 and 15. In the embodiment illustrated, these from floor sill ends 13 are tapered forwardly. Adjacent and to the rear of sections 21 and 22 are rear floor sill ends 27 and 28, respectively, which are reduced on both sides.
  • the packing shield 5 and the caving shield 2 are provided with laterally movable shields 30,31. These are supported on thrust piston drives at 33.
  • Fixed side shields 34 and 35 correspond to the side shields 30, 31 and are movable by means of the thrust piston drives. Supporting the shields on one another protects the coal face space against the penetration of rubble.
  • the arrangement of the thrust piston drives is moreover shown in FIG. 4.
  • the caving shields 2 and the packing shields 5 each consist of a welded structure which is formed by an outer plate 36 and an inner plate 37. These plates are interconnected by a plurality of cross-pieces 38 to 40 and 41 to 43.
  • a tube 44 extends through the crosspieces 38, 39 and serves to accommodate a cylinder 45 of a thrust piston drive.
  • the thrust piston drive is fixed to the cross-piece 40 by a bolt 46.
  • the thrust piston acts through a piston rod 47 and a 'joint 48 on a tubular support 49 which supports the side shield in question.
  • the side shield for its part consists of two plates 51 and 52 disposed at an angle to one another and welded together at 50. The plate 52 is applied against the outer plate 36 of the shield and the plate 51 is supported on the adjacent side shield.
  • a tube 53 extending through the cross-pieces 41, 42, 43 and fixed to them serves to guide the tubular support 49.
  • the support shields can be swung within the limits of the play or movement of the bearers 20, as a result of which correction of the direction of advanceis possible.

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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)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)
  • Lining And Supports For Tunnels (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)

Abstract

A self-advancing coal face support system includes support shields arranged side-by-side, each support shield comprising a front roof shield, a caving shield, a packing shield and a floor sill pivotally connected together. Each support shield is movable relative to a supporting frame for the face conveyor by means of hydraulic cylinders, the floor sill including a tapered front end portion which engages bearers on the frame. The packing shield and the caving shield both include laterally movable side shields movable under the action of hydraulic thrust pistons when a correction is to be effected in the direction of advance of the support system.

Description

United States Patent 1 Wehner et a1.
[451 June 19,1973
1 1 SELF-ADVANCING COAL FACE SUPPORT SYSTEM [75] Inventors: Karl-Heinz Wehner,
Castrop-Rauxel; Willy Watermann, Dortmund-Lanstrop; Gunter Bell, Horneburg, all of Germany [73] Assignee: Klockner-Werke AG, Duisburg,
, Germany [22] Filed: June 1, 1972 [2]] Appl. No; 258,867
[30] Foreign Application Priority Data June 5, 1971 Germany P 21 28 023.9
[52] US. Cl. 61/45 D, 248/357 [51] Int. Cl. E2111 23/00 [58] Field of Search 61/45 D; 299/31,
[56] References Cited UNITED STATES PATENTS 2,910,282 10/1959 Barrett 61/45 D 3,362,169 l/l968 Groetschel 61/45 D 3,570,255 3/1971 Shuttleworth 61/45 D FOREIGN PATENTS OR APPLICATIONS 832,741 1/l970 Canada 61/45 D 1,948,280 1/1971 Germany 6l/45 D 1,958,322 11/1970 Germany 61/45 D 212,198 0/1968 U.S.S.R 61/45 D Primary Examiner-Dennis L. Taylor AttorneyMalcolm W. Fraser [57] ABSTRACT A self-advancing coal face support system includes support shields arranged side-by-side, each support shield comprising a front roof shield, a caving shield, a packing shield and a floor sill pivotally connected together. Each support shield is movable relative to a supporting frame for the face conveyor by means of hydraulic cylinders, the floor sill including a tapered front end por tion which engages bearers on the frame. The packing shield and the caving shield both include laterally mov-' able side shields movable under the action of hydraulic thrust pistons when a correction is to be effected in the direction of advance of the support system.
3 Claims, 5 Drawing Figures PATENTEuJum 91915 3.739 .586
sum 2 or: r
SELF-ADVANCING COAL FACE SUPPORT SYSTEM BACKGROUND OF THE INVENTION in the advanceable abutment, bearers being provided 15 on the advanceable abutment for forming a lateral guide for the support shields.
A coal face support system of this kind operates like a coal face support system with jacks. After the passage of a winning machine, which may be guided, for example, on the supporting frame or on the channel structure of a face conveyor laid on the supporting frame, each shield advances in each case in accordance with the relief of the load on the props supporting the caving shield and in so doing uses the supporting frame as an abutment. With reverse admission of pressure to the shifting cylinders, on the other hand, these cylinders exert the necessary bearing pressure for the face conveyor and/or the winning machine on the abutment.
Support shields of the kind mentioned at the beginning are particularly stable; they are therefore suitable in particular for the mining of thick seams with correspondingly high seam openings.
Support shields with comparatively'short floor sills are known (Spruth Strebausbau in Stahl undLeichtmetall (Coal Face Supports in Steel and Light Metal) 1963, p. 198, FIG. 177). They require, inter alia, frontal area roof bars carried by special props and keep open a coal face space which has a comparatively small cross-section. This is not sufficient for the large amounts of air which are required for efficient mining systemsfln addition, it is a disadvantage thatin consequence of the small length of the floor sills portions of the shifting cylinders are located outside the open coal face space.
Support shields of the kind mentioned at the beginning are likewise known from Offenlegungsschrift No. 1958322. These shields have relatively long floor sills. This'is the reason not only for their stability, but also for the size of the face space kept open by them, which is adequate for efficient mining. On the other hand, the support shields are lacking in all facilities for excluding the penetration of rubble into the face space between the shields. The support shields must therefore be immediately adjacent one another.
Of course, support shields are also known which consist of an inclined caving shield and a head plate serving to support the still unbroken coal face roof (Journal Glueckauf" 103 (1967), No. 20, pp. 1013 to 1014). Although a support shield of this kind keeps open a coal face space which is comparatively small and of inadequate size for modern winning systems, it is provided on one side with movable side shields supported on side shields corresponding to them and which are fixed to the neighboring support shield. The movable side shields are supported resiliently by means of a telescopic guide onthe caving shield and are thereby so biased that they are applied so firmly against the corresponding fixed side shields of the neighboring support frame that a reliable seal is produced.
The self-advancing coal face support system with the known support shields does not cause any particular difficulties as long as the support shields retain the direction of advance specified for them. In support shields with comparatively long floor sills, however, there is a considerable increase in the risk of the shields sideslipping in spite of the lateral guides provided on the advanceable abutment. With this there is linked a swinging of the support shields and a change in their direction of advance, which must be corrected. Since, because of the required sealing of the coal face space against the penetration of stowing material or dirt, the support shields must be supported on one another either directly or by way of. the side shields, the correction of the direction of advance entails exceptional difficulties. These are still an obstacle to the utilization of the special advantages of shield support systems.
The principal object of the present invention is the provision of support shields with means for correction of their direction of advance without changes in the basic structure of such shields and in particular the endangering of the seal against the penetration of rubble or stowing material becoming necessary for this purpose.
SUMMARY OF 'THE INVENTION According to the invention, the floor sills of the support shields have sections the longitudinal sides of which are supported against the associated bearers, the front and rear end of each floor sill being tapered and the packing shield and the caving shield being provided adjacent the rear end of the floor sill with laterally movable shields which are supported on corresponding side shields of the respective support. shield and screen the coal face space against the penetration of rubble. The movable side shields are supported on hydraulic thrust piston drives to which pressure can be admitted to swing the support shields when a correction of the direction of advance is required.
The invention provides a shield support system for coal face spaces of large cross-section, and thereby for efficient mining systems, with reliable sealing against the penetration of rubble with the aid of side shields which, inconsequence of their support on thrust piston drives, perform an additional function. This consists in swinging the rear end of a support shield by retracting or extending the thrust pistons and in this way producing a correction of the direction of advance of the supportshields. This swinging movement is rendered possible by the tapering of the ends of-the floor sills and is effected without the sealing of the face space being lost. This movement therefore cannot be blocked by loose rock in the face space.
Thepossibility of swinging the support shields isall the greater the longer and narrower the floor sill ends are. The section of each support shield which is supported by means of its longitudinal sides against the associated bearers therefore only needs to be long enough to be able to accommodate the props or rams supporting thecaving shield, because the guiding func tion of the bearers is supplemented by the guiding action which is produced by theside shields.
It has been found advantageous to taper'forwardly the front floor sill end introduced into the opening in the advanceable abutment. In this way, an increase in the swinging range of the floor sills is achieved.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. is a plan view of the floor sills of two support shields with a conveyor supporting frame.
DESCRIPTION OF THE PREFERRED EMBODIMENTS The coal face support system shown in the drawings includes support shields each of which has a front roof shield 1 supporting the still unbroken roof zone. This roof shield is articulated to a caving shield 2 at 3 and the caving shield is attached in turn at 4 by means of ajoint to a packing shield 5. The packing shield is connected immovably by means of transverse bolts 6 and 7 to a floor sill designated generally by the reference 8. Hydraulic rams act between the floor sill 8 and the caving shield 2. By means of one or more shifting cylinders 9, which are designed so that they are double-acting, the support system can be advanced by using a'supporting frame 10 extending along the coal face (not shown) as an advanceable abutment; with reverse admission of pressure to the shifting cylinder or cylinders 9, a face conveyor 11 laid on the supporting frame 10 is held against the coal face with the necessary contact pressure.
In the advanceable abutment described there are openings 12 into which tapered front ends 13 of the floor sill 8 are introduced in each case. As shown in FIG. 2, the supporting frame 10 consists of individual sections 14 and 15 which are articulated to one another by means of ball-and-socket joints 16 so that they are swingable horizontally and vertically. These sections have the same length as the sections of the channel structure of the conveyor 11. At the joints of each two frame sections 14 and 15 adjacent one another in the supporting frame 10 there are plates 17 and 18, respectively, for receiving horizontal link pins 19 serving to articulate bearers 20 which form lateral guides for the support shields.
The support shield floor sills have intermediate sections 21 and 22. At the longitudinal sides of these sections there are ridges 23 and 24, respectively, which are supported on the respective longitudinal sides of the bearer 20. Adjacent the sections 21 and 22 at the front are the floor sill ends 13 which are introduced into the openings 12 in the frame sections 14 and 15. In the embodiment illustrated, these from floor sill ends 13 are tapered forwardly. Adjacent and to the rear of sections 21 and 22 are rear floor sill ends 27 and 28, respectively, which are reduced on both sides.
As shown in FIG. 1, in the region of the rear floor sill ends 27 and 28, the packing shield 5 and the caving shield 2 are provided with laterally movable shields 30,31. These are supported on thrust piston drives at 33. Fixed side shields 34 and 35 correspond to the side shields 30, 31 and are movable by means of the thrust piston drives. Supporting the shields on one another protects the coal face space against the penetration of rubble. The arrangement of the thrust piston drives is moreover shown in FIG. 4.
The caving shields 2 and the packing shields 5 each consist of a welded structure which is formed by an outer plate 36 and an inner plate 37. These plates are interconnected by a plurality of cross-pieces 38 to 40 and 41 to 43. A tube 44 extends through the crosspieces 38, 39 and serves to accommodate a cylinder 45 of a thrust piston drive. The thrust piston drive is fixed to the cross-piece 40 by a bolt 46. i
The thrust piston acts through a piston rod 47 and a 'joint 48 on a tubular support 49 which supports the side shield in question. The side shield for its part consists of two plates 51 and 52 disposed at an angle to one another and welded together at 50. The plate 52 is applied against the outer plate 36 of the shield and the plate 51 is supported on the adjacent side shield. A tube 53 extending through the cross-pieces 41, 42, 43 and fixed to them serves to guide the tubular support 49.
By retracting and extending the thrust piston in the cylinder 45, the support shields can be swung within the limits of the play or movement of the bearers 20, as a result of which correction of the direction of advanceis possible.
What is claimed is:
l. A self-advancing coal face support system with support shields arranged side by side, the support shields comprising a front roof shield, a caving shield hingedly connected thereto, a packing shield articulated to the caving shield and a floor sill, and being articulated by means of one or more shifting cylinders to an advanceable abutment extending through the coal face, in particular a supporting frame for the face conveyor, and being introduced by means of a front sill end into an opening provided inthe advanceable abutment, bearers being provided on the advanceable abutment for forming a lateral guide for the support shields, the floor sills of the support shields including sections and longitudinal sides of which are supported against the associated bearers, the front and rear end of each floor sill being tapered and the packing shield and the caving shield being provided adjacent the rear end of the sill with laterally movable shields which are supported on corresponding side shields of the respective support shield and screen the coal face space against the penetration of rubble, and the laterally movable shields permitting swinging of the support shield when a correc tion of their direction of advance is required.
2. A support system according to claim 1, wherein the front floor sill end introduced into the opening of the advanceable abutment tapers forwardly.
3. A support system according to claim 1, wherein hydraulic thrust piston mechanisms act between each movable shield and the associated side shield.

Claims (3)

1. A self-advancing coal face support system with support shields arranged side by side, the support shields comprising a front roof shield, a caving shield hingedly connected thereto, a packing shield articulated to the caving shield and a floor sill, and being articulated by means of one or more shifting cylinders to an advanceable abutment extending through the coal face, in particular a supporting frame for the face conveyor, and being introduced by means of a front sill end into an opening provided in the advanceable abutment, bearers being provided on the advanceable abutment for forming a lateral guide for the support shields, the floor sills of the support shields including sections and longitudinal sides of which are supported against the associated bearers, the front and rear end of each floor sill being tapered and the packing shield and the caving shield being provided adjacent the rear end of the sill with laterally movable shields which are supported on corresponding side shields of the respective support shield and screen the coal face space against the penetration of rubble, and the laterally movable shields permitting swinging of the support shield when a correction of their direction of advance is required.
2. A support system according to claim 1, wherein the front floor sill end introduced into the opening of the advanceable abutment tapers forwardly.
3. A support system according to claim 1, wherein hydraulic thrust piston mechanisms act between each movable shield and the associated side shield.
US00258867A 1971-06-05 1972-06-01 Self-advancing coal face support system Expired - Lifetime US3739586A (en)

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DE2128023A DE2128023B2 (en) 1971-06-05 1971-06-05 Migrating longwall construction with side-by-side support shields

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Cited By (12)

* Cited by examiner, † Cited by third party
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US3891275A (en) * 1972-11-25 1975-06-24 Bochumer Eisen Heintzmann Mobile mine roof support with mining apparatus
US3911686A (en) * 1973-04-19 1975-10-14 Gewerk Eisenhuette Westfalia Mineral mining installations
US3992888A (en) * 1975-04-15 1976-11-23 Bochumer Eisenhutte Heintzmann & Company Hydraulic pit prop
US4002036A (en) * 1974-06-04 1977-01-11 Gullick Dobson Limited Mine roof supports
US4041714A (en) * 1974-11-23 1977-08-16 Gullick Dobson Limited Mine roof supports
US4045087A (en) * 1974-09-07 1977-08-30 Cecil Vowe Peake Mining apparatus
US4092831A (en) * 1975-06-05 1978-06-06 Becorit Grubenausbau Gmbh Roof bar for surface support elements
US4293247A (en) * 1978-12-08 1981-10-06 Gewerkschaft Eisenhutte Westfalia Seals for mine roof supports
US6481933B1 (en) * 1999-11-05 2002-11-19 Dbt Deutsche Bergbau-Technik Gmbh Powered support frame for large seam thicknesses with controlled gap sealing plates
US20110006586A1 (en) * 2009-07-10 2011-01-13 Joy Mm Delaware Longwall mining roof supports
CN102182485A (en) * 2011-03-17 2011-09-14 兖州煤业股份有限公司 Vehicle-mounted advance support device of cantilever type excavator
CN105221174A (en) * 2015-10-08 2016-01-06 山西晋城无烟煤矿业集团有限责任公司 Cross inbreak section supporting method

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DE2601001A1 (en) * 1976-01-13 1977-07-14 Johannes Winkler Mine roof support for inclined seams - has pivoting guide attached to similar guide equipment of adjoining support unit
ZA762055B (en) * 1976-04-08 1977-05-25 Dowty Mining Equipment Ltd Mine roorf support
DE3140924C2 (en) * 1981-10-15 1985-07-18 Bochumer Eisenhütte Heintzmann GmbH & Co KG, 4630 Bochum Longwall frame
AT388971B (en) * 1986-01-22 1989-09-25 Voest Alpine Ag TRACK BODY ROLLABLE ON TRACK
CN106703855A (en) * 2016-12-22 2017-05-24 淮南矿业(集团)有限责任公司 Foldable and extensible advanced support
CN106761872B (en) * 2016-12-22 2019-05-31 淮南矿业(集团)有限责任公司 A kind of liftable, folding, stretching, extension machine-carried forepoling device

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SU212198A1 (en) * В. А. Михалицын, Н. И. Щербаков , А. А. Портнов SECTION OF MECHANIZED STRIPS OF THE PROTECTIVE-SUPPORTING TYPE
US2910282A (en) * 1957-07-15 1959-10-27 Dowty Mining Equipment Ltd Mine roof support devices
US3362169A (en) * 1963-12-21 1968-01-09 Karl Maria Groetschel Roof supporting systems for mine workings
CA832741A (en) * 1970-01-27 Vasilievich Martynov Boris Mechanized hydraulic timbering
DE1958322A1 (en) * 1969-04-29 1970-11-12 Banyaszati Ki Budapest Dismantling sign
US3570255A (en) * 1968-06-10 1971-03-16 Mastabar Mining Equipment Co L Mine roof support
DE1948280A1 (en) * 1969-09-24 1971-04-01 Krampe & Co Delay for the moving longwall mining

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Publication number Priority date Publication date Assignee Title
SU212198A1 (en) * В. А. Михалицын, Н. И. Щербаков , А. А. Портнов SECTION OF MECHANIZED STRIPS OF THE PROTECTIVE-SUPPORTING TYPE
CA832741A (en) * 1970-01-27 Vasilievich Martynov Boris Mechanized hydraulic timbering
US2910282A (en) * 1957-07-15 1959-10-27 Dowty Mining Equipment Ltd Mine roof support devices
US3362169A (en) * 1963-12-21 1968-01-09 Karl Maria Groetschel Roof supporting systems for mine workings
US3570255A (en) * 1968-06-10 1971-03-16 Mastabar Mining Equipment Co L Mine roof support
DE1958322A1 (en) * 1969-04-29 1970-11-12 Banyaszati Ki Budapest Dismantling sign
DE1948280A1 (en) * 1969-09-24 1971-04-01 Krampe & Co Delay for the moving longwall mining

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3891275A (en) * 1972-11-25 1975-06-24 Bochumer Eisen Heintzmann Mobile mine roof support with mining apparatus
US3911686A (en) * 1973-04-19 1975-10-14 Gewerk Eisenhuette Westfalia Mineral mining installations
US4002036A (en) * 1974-06-04 1977-01-11 Gullick Dobson Limited Mine roof supports
US4045087A (en) * 1974-09-07 1977-08-30 Cecil Vowe Peake Mining apparatus
US4041714A (en) * 1974-11-23 1977-08-16 Gullick Dobson Limited Mine roof supports
US3992888A (en) * 1975-04-15 1976-11-23 Bochumer Eisenhutte Heintzmann & Company Hydraulic pit prop
US4092831A (en) * 1975-06-05 1978-06-06 Becorit Grubenausbau Gmbh Roof bar for surface support elements
US4293247A (en) * 1978-12-08 1981-10-06 Gewerkschaft Eisenhutte Westfalia Seals for mine roof supports
US6481933B1 (en) * 1999-11-05 2002-11-19 Dbt Deutsche Bergbau-Technik Gmbh Powered support frame for large seam thicknesses with controlled gap sealing plates
US20110006586A1 (en) * 2009-07-10 2011-01-13 Joy Mm Delaware Longwall mining roof supports
US8590982B2 (en) 2009-07-10 2013-11-26 Joy Mm Delaware, Inc. Longwall mining roof supports
US9670777B2 (en) 2009-07-10 2017-06-06 Joy Mm Delaware, Inc. Longwall mining roof supports
CN102182485A (en) * 2011-03-17 2011-09-14 兖州煤业股份有限公司 Vehicle-mounted advance support device of cantilever type excavator
CN105221174A (en) * 2015-10-08 2016-01-06 山西晋城无烟煤矿业集团有限责任公司 Cross inbreak section supporting method

Also Published As

Publication number Publication date
GB1375894A (en) 1974-11-27
FR2140421A1 (en) 1973-01-19
DE2128023B2 (en) 1974-04-18
DE2128023A1 (en) 1972-12-14
FR2140421B1 (en) 1980-04-18

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