Abstract: A scraper conveyor has a channel having a pair of parallel and longitudinally extending upstanding sides and a chain extending longitudinally along the channel between the sides thereof and normally advanced therein in a travel direction. A chain-arresting system has a crosspiece fixable to the chain and having outer ends juxtaposed with the channel sides and each of a predetermined length measured in the direction. Respective blocks fittable with the sides of the channel are each formed with an inwardly open inner groove into which the respective end of the crosspiece can engage. An abutment in the groove has a rear face directed backward against the direction and engageable with the respective crosspiece end and an inner hole spaced in the direction rearward of the abutment face by a distance greater than the crosspiece-end length. Respective pins engageable through the inner holes behind the respective crosspiece ends trap same in the respective blocks.

Abstract: A horizontally extending guide rail has an upwardly open slot and a mining machine is displaceable longitudinally along the guide rail and has a drive wheel with teeth engageable into the slot. A drive chain rides in the slot and has horizontal links and vertical links alternating with the horizontal links and each formed with a horizontal lower shank having ends, a horizontal upper shank having ends above the ends of the respective lower shank and forming an upwardly open pocket dimensioned to receive a tooth of the drive wheel, and a pair of horizontally spaced and vertically extending bights connecting the ends of the upper shank to the ends of the respective lower shank. The bights pass through the horizontal links flanking the respective vertical link.

Abstract: A mining apparatus has a longitudinally extending conveyor, a guide-rail assembly secured to the conveyor and forming an upwardly open cruciform passage, a drive chain in the passage, and a mining machine displaceable along the assembly and having a toothed drive wheel engageable in the chain in the passage. The rail assembly is formed by a main rail fixed to the conveyor and forming a portion of the passage and a secondary rail fixed to the main rail and forming the rest of the passage. The secondary rail forms offset from the passage a horizontally outwardly open and longitudinally extending slot and the mining machine has a foot received in and longitudinally displaceable along the slot.

Abstract: A bicycle centering device consisting of a mounting assembly (5) which can be mounted on the frame or on the fork (1) of a bicycle, a pivot arm (33), which on one end is rotatably and pivotably connected to the mounting assembly (5) and which on the other end is rotatably and pivotably connected to a dial gauge (52), so that a sensor probe (53), the dial gauge (52) and the rim (2) can be brought into contact.

Abstract: A rotary impact breaker has a housing and a rotor rotatable in the housing about an axis in a predetermined direction and formed with a radially outwardly open pocket having a generally radially extending front and back faces. An impact element has a foot part seated in the pocket and having a front face bearing against the front pocket face and a back face confronting and diverging from the back pocket face and a head part projecting radially from the pocket. A retaining wedge in the pocket has a front face bearing forwardly against the back element face and a back face backwardly against the back pocket face. A bolt engages radially from the wedge into the rotor and presses the wedge radially inwardly and thereby tightly lodges the wedge between the back element face and back pocket face.

Abstract: A classifying grate has corrugated bars with respective stubs eccentrically journaled in bearing blocks in bearing chambers of the longitudinal supports on either side of the grate bars. The bearing blocks have play Sr in the feed direction of the breaker product, and the bars can move with axial play relative to the blocks. The play and eccentric mountings of the grate bars ensures that there will be no jamming of the product in the gaps between the bars and consequent damage to the bear stubs and blocks.

Abstract: A chain arrangement for drag-chain conveyors. The chain arrangement includes a round-link chain with vertical chain links, horizontal chain links and pushers fastened on horizontal chain links. The pushers engage with pusher projections into the respective horizontal chain links. The outer radius of the chain link arc members of the vertical chain links is selected smaller than the inner radius of spherically-shaped recesses in the pusher projections. The resulting play ensures that the pushers travel without jamming and enter without problems into the guide surfaces of the upper portion of the conveyor trough of the drag-chain conveyor.

Abstract: An arrangement for guiding on a coal bank side a coal cutting machine at a conveyor trough with guide section portions for a round-link chain which is engaged by a chain drum which drives the cutting machine. The abutting ends of the guide section portions are constructed without upper guides and have overlapping joint projections. In addition the abutting ends of the guide section portions are connected to each other through chain guide members which extend across the joint area. The chain guide members are connected through connecting bolts while maintaining a predetermined play to the trough portions, wherein the chain guide members have corresponding recesses in the area of the guide section portion which is free of upper guides. As a result, the round-link chain is guided so as to be aligned in the abutting areas and the round-link chain is easily accessible.

Abstract: A chain joint for round-link chain, particularly cutting chain, includes chain link arc members and chain link side members connecting the chain link arc members. Bearing members are provided on one side of the chain link arc members. The bearing members have threaded bores and a threaded bolt can be screwed into the threaded bores to form one of the chain link side members. The chain joint is without tension and meets the requirements of a true chain link and can be integrated into the dimensions of a round link chain.

Abstract: A drive station for a longwall conveyor includes a sprocket wheel mounted in the drive head of a machine frame and with a drive unit flanged to the sprocket wheel. The lateral walls of the machine frame are formed in the region of its drive head as guide cheeks with guide recesses for bearing cheeks displaceably guided therein in longitudinal haul direction, between which (cheeks) the sprocket wheel is mounted. The bearing cheeks are connected together by a traverse. A chain tensioning device works against the traverse. For the drive chain of a winning machine a second drive unit is provided, which is likewise mounted displaceably in longitudinal haul direction and is acted upon by a chain tensioning device. In this manner the conveyor chain and the drive chain e.g. plane chain, can be tensioned independently of each other while obtaining a short machine frame design.

Abstract: A mining apparatus for coal with an endless chain revolving around chain wheels. A main drive is provided for one of the chain wheels and an auxiliary drive is provided for the other chain wheel. A transmission stage of the auxiliary drive is a superposed transmission unit. A controllable superposed motor with a worm gear transmission unit acts on the superposed input of the superposed transmission unit. The worm gear transmission unit includes two drive worms which are offset relative to each other by 180.degree. and mesh with the superposed input of the superposed transmission unit. As a result, the supporting moment load and the torque load or power distribution are cut in half, so that the worm gear transmission unit is not susceptible to trouble.

Abstract: A mining tool for the breaking-down of minerals, particularly coal. The mining tool includes a chisel with a chisel shaft with a receiving bore and a chisel holder with an insertion bore. The bores are in alignment when a locking bolt is driven into the bores. The locking bolt is a mandrel screw with a threaded portion which over its length includes a sharp thread and a trapezoidal thread. The circumferential surfaces of the trapezoidal thread form a driving-in cone. The mandrel screw can be easily driven into the receiving bore which includes a chuck. In addition, because of the sharp thread, the mandrel screw can be unscrewed quickly, so that a quick chisel exchange is possible.

Abstract: A mining apparatus for the mechanized breaking-down of mineral raw materials, particularly coal, in underground mining operation includes at least one endless chain and chain wheels for the endless chain. A main drived is provided for one of the chain wheels and an auxiliary drive is provided for the other chain wheel. The main drive and the auxiliary drive each has a transmission unit including main transmission stage, initial transmission stage, coupling and drive motor. A superposed motor in the form of a controllable electric motor having small power acts in connection with a worm gear transmission on the superposed input of the superposed transmission unit. Synchronous running of the main drive and the auxiliary drive or the drive motors thereof is achieved by a unilateral drive control. This results in a uniform power and load input independently of the wear of the chain and chain wheels.

Abstract: A round link chain having vertical links with a smaller pitch than the horizontal links. The combined pitch of each vertical link and horizontal link in the configuration of a size 42 round link chain corresponds to the combined pitch of two chain links of a size 38 round link chain, so that in consideration of the stout vertical links, it is possible to use a size 42 round link chain in place of a size 38 round link chain in conventional chain scraper conveyors with limited height of passage for the carrying run and the slack run, and this without altering the pitch diameter of the chain sprockets.

Abstract: A chain scraper conveyor with conveying chute includes a central guided tension chain and catches attached thereto, which are guided in the chute walls. The catches have undersides with a chain link holder assembly for an O-shaped chain link arranged parallel to the chute floor, and the chain link holder assembly includes a stirrup holder and a chain stirrup which is placed on the chain stirrup holder with the positioned chain link, and the stirrup is also positioned in the chain stirrup holder with the chain stirrup clamping the chain link into the chain stirrup holder in the area of its center. A set-screw is provided on each of the stirrup ends, which are set with play into a corresponding bore in the catch and secured by a nut on the other side of the catch. The chain stirrup is stretched into the stirrup holder with a curved elastic deformation, whose curve lies in the plane of the catch, and mounted on the chain link.

Abstract: A tool assembly for mining machines and particularly for coal planes or coal cutting machines comprises a cutter which has a shank portion which is engaged to a seat of a size comparable to the shank portion of a cutter holder and it is held in that position by a locking pin which extends through aligned bores of the holder and the shank portion which may be retracted into a knockout slot defined in the shank portion which is closed on each side by a portion of the cutter holder in an arrangement in which the locking pin may be retracted into the knockout slot for removal of the cutter.

Abstract: Apparatus for hauling mined coal in a subsurface mining operation with a longwall conveyor, a drift conveyor and a cross frame with stripper for the connection of the longwall conveyor with the drift conveyor. The longwall conveyor and the drift conveyor are designed as chain scraper conveyors and include a conveyor trough with trough bottom and trough sidecheeks, pushers guided in the sidecheeks, and at least one pull chain with which the pushers are connected and which runs in the region of the trough center at least in the case of the longwall conveyor. On the side away from the lateral discharge, the pushers are guided in a guide trough continuing the associated trough sidecheek. A track-in device for disengaged pushers of the longwall conveyor running with one arm on the trough sidecheek is provided, which comprises a track-in cutout in the trough sidecheek.

Abstract: A coal plane guiding device has plane guiding profiles with an upper and a lower chain channel for a planing chain and they are provided with intake gates disposed at both ends of the plane guidance system for the entry of the planing chain. For this purpose, the plane guiding end profiles or attached intake gates have, in the area of the chain channel, an intake spiral of helical nature with a hollow core for the planing chain shaped so that jammed chain links can return helically into their normal position in the course of entering the chain channel.

Abstract: A planing machine for the mining of minerals particularly a coal plane which has a planing chain guided on the filling side, and comprises two individual planes with plane bodies interconnected by an articulated connection, a sword plate of each plane body grips under a conveyor chute. The plane bodies are each supported on each plane against a conveyor chute sidewall on the coal face side by means of a horizontal, centrally mounted roller. Vertical bearing pins of the rollers form floating shafts for the plane bodies. Sword plates are individually connected to the planing chain and are not interconnected by otherwise used hinges. This makes for a good ability to negotiate curves and adaptability when traversing curves as well as troughs and saddles.

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.