Abstract: A drive device consists of at least two three-phase electric motors arranged paraxially alongside of each other, and each of the stators (6) thereof has its own winding (11). A single stack of laminations integrally serves each stator (6), in that each lamination is cut-out to serve plural stators. The winding (11) and the lay-out of stator-slots (7) and the supply-phase connection to each phase of the three-phase supply network is so selected for all motors that the magnetic-flux maxima of the same polarity in the yokes (9) of the stators (6), which maxima rotate in the direction of rotation of the motor, pass at different times through the location of minimum spacing between directly adjacent stators (6).

Abstract: A roll cutter loader is guided on a plane guide and has a machine frame with cutter rolls pulled by a plane chain. The machine frame is subdivided into two machine joint elements each with a cutter roll and roll drive assembly. The two machine joint elements are lower in structural height than the cutter rolls and are adjustably connected together relative to the floor, on the one hand via a joint and on the other hand via a setting device. In this way maneuverable, adaptable and compact construction is achieved, so that the roll cutter loader can be used to mine low mineral lodes.

Abstract: A trough section for conveyor troughs have a carrying run with a wear tub resting on a trough bottom. The trough has sidewalls forming a trough profile in the carrying run into which the tube is exchangeably insertable. The wear tub comprises on both sides one or more fixing pockets, while the trough section has side walls with lateral flanges, of which the working side lateral flange comprises one or more pivotably mounted fixing shackles which can be pivoted into a corresponding one of the fixing pockets and are lockable therein.

Abstract: A planer drive includes a sprocket wheel for a planing chain, the sprocket wheel having a secondary chain ring, and a driveshaft has a primary chain ring. On at last two circles juxtaposed at a predetermined distance, the primary chain ring has radial holes for clutch pins, conical friction segments attached to the clutch pins forming two revolving friction rings whose outside flanks work against an annular groove of the secondary chain ring. Between the two friction rings on the primary side, the secondary chain ring has a centrally engaging friction ring of appropriate taper which works against the inner flanks of the friction rings on the secondary side. The friction ring on the secondary side is mounted so as to be axially movable so that uniform engagement, reduced wear due to low specific contact pressure and better heat dissipation are assured while emergency operating properties are maintained.

Abstract: A plate and scraper chain conveyor trough is disclosed for mining operations. Each conveyor trough which has opposite lateral sidewalls is provided with reinforcing plates which are welded to the sidewalls. Each reinforcing plate has a socket member at one end and a ball member at the other end. The ball member is adapted to engage a socket member of a plate in an adjacent trough to enable the conveyor length made up of a plurality of troughs to withstand increased pull from a scraper chain which is pulled with increased power.

Abstract: A transfer station from a longwall chain conveyor to a drift chain conveyor have upper and lower reaches which cross alternately. The upper belt section of the longwall conveyor comprises a scraper over the upper belt section of the drift conveyor. The working face side of the longwall conveyor has a plane guide for a coal plane and a plane chain which at least at the drift-side end of the longwall conveyor is guided via guide wheels to a gob-side drive unit. These two drift-side guide wheels are arranged with a vertical spacing from each other in the lower belt section of the longwall conveyor such that they form between them a passage for the chain belt and for the tappets of the longwall conveyor attached thereto. The drift-side guide wheels are arranged so close to the drift conveyor that in its drift-side and position the coal plane can transfer the won coal directly into the drift conveyor. In all, an especially compact plane chain deflection integrated into the longwall conveyor is realized.

Abstract: A driver for a chain conveyor which is adapted to run in a conveyor trough which has side guide walls comprises a driver arm portion having outer side edges which terminate in a polygonal pin portion which tapers inwardly in lateral and longitudinal directions toward its outer end. A guide shoe has an inner side face with a recess into which the pin portion of the arm extend and the guide shoe is pivotally supported on the arm pin portion by a pin or sleeve element. The guide shoe includes an inwardly extending nose portion which rides between side edges of a U-shaped recess of the arm portion. Surfaces of the nose portion and the U-shaped recess of the arm defining recesses and stops for limiting the pivotal movement of the shoe.

Abstract: To be able to minimize the size of the lifting cylinder, a control lever is braced against an abutment at the waste side, and hinged on its other end to the piston rod of the lifting cylinder, thereby forming a movable hinge axis. Consequently, in a normal position, the fixed hinge axes of the lifting cylinder and the control lever form a triangle of joints, with the common movable hinge axis therebetween at the inside, i.e. at the side of a control bracket. The control bracket is designed with a bent extension projecting below the conveyor extending toward the planer and forming a scraper edge which alos serves as a tilting axis for angularly positioning the conveyor with the planer. The adjusting device permits of a coal planer conveyor in height as it moves over a coal face with the planer on one side of the conveyor and a bracket secured to the opposite side wall.

Abstract: A mechanism for connecting two trough sections of a conveyor trough comprises connecting bolts which have heads on both sides and bridge the joints between the sections and are inserted in receivers which are provided in the section walls and are accessible from the inside of the upper trough portion. The bolt shanks have a rectangular cross section and are inserted through slots which are narrower than the broader side of the bolt shank. Upon inserting, the bolts are turned and arrested in transverse position relative to the insertion slot.

Abstract: A conveyor trough particularly for scraper chain conveyors comprises a plurality of transversely extending interconnected plates with adjacent plates having abutting edges with alternately arranged projecting tongues and recesses which define a hinge connection between the longitudinally adjacent plates. The plates are advantageously substantially flat and include tongue formations formed by recesses made either on the top or the bottom of the plate for selectively defining underlying or overlying tongues.

Abstract: A mining apparatus comprises a planing device which is movable along a longwall to the drift and has a longwall conveyor which extends alongside it and is deflected into the drift for the removal of the cutaway material. A cutter is operable in the transition between the longwall and the drift and includes a rotatable shaft which is rotatable on a conveyor in the transition between the longwall and the drift and includes an outer arm which carries a rotatable cutting wheel which is moved by the swivel arm through the cutting zone at the transition between the longwall and the drift. The swivel arm is pivotable on a bearing shaft which carries a chain wheel which is driven from a chain drive which operates a plane cutter which is movable along the longwall. The chain drive includes a chain wheel which is rotatable with the bearing shaft and is connected by a separate cutter chain drive which extends through the swivel arm to a chain wheel affixed to the shaft of the cutter wheel.

Abstract: A conveyor trough for a scraper chain conveyor comprises a sheet metal bracket which is adapted to be secured to one side of the side wall of the conveyor trough, namely the waste side. The sheet metal bracket has an outwardly bent cover leg. An attached bracket is secured to the inside surface of the metal bracket on the side facing the conveyor trough and it is made of a resiliently bending material which projects upwardly from the cover leg and has a loop forming bend at its top forming the upper edge thereof and an outwardly extending stabilizing leg which is propped against the cover leg of the metal bracket. The stabilizing leg is advantageously bent back toward the vertical, so that intermediate its height it forms a bend which engages over a sectional strip to hold the strip between it and the vertical interior leg portion of the resiliently bending metal bracket.

Abstract: A planar drive mechanism comprises a sprocket wheel for a planar chain and a drive shaft for rotating the sprocket wheel. The sprocket wheel has a secondary rim portion for driving the chain and the drive shaft has a primary rim. A clutch mechanism is connected between the primary and secondary rims which comprises a circular groove of trapazoidal cross section formed in the secondary rim which receives a plurality of friction segments connected to the primary rim. Each friction segment is carried by a coupling bolt which is slidably mounted in radially extending bores in the primary rim aligned with the circular groove. The coupling bolts and friction heads while functioning as a unit can be made of two separate materials, the coupling bolt made of material to give it strength and the friction segments made of material to give it wear resistance.

Abstract: A planer assembly is disclosed for winning minerals from a mineral face comprising, a planer guide member, at least two planers slidably engaged on the guide member for movement in a travel direction along the face, a hinge interconnecting the two planers for transferring rotational moment applied to the planers and a planer tool holder mounted on each planer which carries a tool. The planer tool holder is positionable at an angle to make a cut of a selected depth with the depth increasing from planer to planer in a direction opposite the travel direction.

Abstract: A hauling and shaving plant for underground mining of a mining face particularly a coal face which is adjacent a rock face disposed at an angle thereto comprises a longwall conveyor section which is adapted to be positioned alongside the coal face and a rock face section extending at an angle to the longwall conveyor section. A plane guide is associated with the conveyor and a plane is movable along the guide. A shaving chain guide is associated with the plane guide in the conveyor. A plane chain is connected to the plane and is movable along the plane guide. The hauling chain has a pulling strand and a return strand and is guided along the longwall conveyor. The shaving chain and the hauling chain are driven by drives which are located adjacent the rockwall section. The conveyor includes at least one deflecting pulley over which the pulling strand is directed and at least one return pulley over which the return strand is directed. The return strand is also guided adjacent the rock face in a return channel.

Abstract: A device for guiding a coal planer having a planer body on a conveyor trough for planing a coal face, comprising, a shaped planer guide secured to a side of the trough facing the coal face having an upper and lower chain channel for receiving a moving chain for moving the planer body. The upper channel is open toward the coal face. The planer guide includes an upper guide rail embraced by a guide claw connected to the planer body. The guide claw has a portion extending into the upper chain channel. The upper guide rail has a vertical track surface and the planer guide has a horizontal track surface spaced from the vertical track surface on an opposite side of the open upper chain channel. Horizontally and vertically mounted rollers are provided in the guide claw for riding against the vertically and horizontally extending track surfaces.

Abstract: A trench hewing tool assembly comprises a cutting blade holder having a shank receiving opening and at least one retaining recess, a cutting blade having a shank disposed in the shank receiving opening, the shank having an inclined wall recess on one side thereof, and a cutting edge member connected to the cutting blade facing a hewing direction. A tapered clamping bolt is connected to the holder and spring loaded toward the blade shank to engage an inclined wall of the inclined wall recess to retain the blade in the holder. A projection is provided on the holder which is spaced from the cutting blade and a guard member has lateral legs which straddle the projection. The guard member includes at least one claw which is engaged on the retaining recess of the holder and has a locking groove in which is received the blade. The guard is held between the blade and the holder.

Abstract: A hauling and cutting assembly of the type having a conveyor trough and a scraper chain conveyor bridging the conveyor trough includes a roller member radially mounted for rotation on the end of a bearing pin which supports a sprocket wheel and a guide member operatively connected to the conveyor trough overlaps the roller member to provide radial support therefor.

Abstract: A roll crusher for crushing lumpy material particularly coal and other minerals comprises a conveyor trough having a trough bottom with a plurality of longitudinally extending laterally spaced chains trained to run over the trough bottom and move through a path from beneath a crushing roller of the roll crusher. The crushing roller is rotatably mounted above the trough bottom and has a rotatable shaft portion with a plurality of radially extending axially spaced and angularly offset striker portions along its length. A plurality of pushers extend laterally between and interconnect adjacent strands so as to form a chain mat type structure of the conveyor which moves along the trough beneath the crusher roll. The chains are spaced laterally apart by spacing comprising a clearance selected to be equal to or less than the maximum grain size to be formed in the material by the crusher.

Abstract: A device for the homogenization of material to be crushed particularly for crushing coal to uniform grain size comprises a first conveyor for feeding the material to be crushed which has an upper section and a lower section which extends downwardly away from and below the upper section. A coarse material conveyor overlies the lower section and is disposed at the level of the upper section and between it and the upper section there is a grading device which permits deflection of the fine material so that it is fed downwardly with the lower section and the transfer of the coarse material over the lower section onto a perforated crusher plate. A crushing roll is disposed above the crusher plate in a position to crush the coarse material which is fed thereon to a side operable to the material carried by the lower section and to deposit this material onto the lower section by passage through the openings of the crusher plate.