Abstract: There is provided a self-propelled conveyor for use in mining operations having an endless revolving conveyor strand driven in its longitudinal direction by intermediate drives and guided on a conveyor frame which consists of segments multi-directionally pivotally connected to one another along the central longitudinal axis of the conveyor. The conveyor frame has downwardly extendible support elements which, for the conveying operation, lift the conveyor strand reversing in the lower stringer from the ground when the support elements are extended. For the transporting operation, the support elements are retracted so as to permit the strand to lie on the ground. Between the segments of the conveyor frame disposed in the front region of the conveyor there are steering cylinders by means of which the angle between these segments can be adjusted so as to direct the longitudinal direction of the conveyor.

Abstract: A double central chain belt assembly for a chain scraper conveyor has scraper members arranged at spacings relative to each other. Each scraper member comprises a central portion and two outside portions of the same configuration. Each adjacent pair of scraper members are connected together by a pair of chain portions which are arranged at respective sides of the center line of the assembly. Each end of each chain portion terminates in an end link which serves as a connecting link. The central portion and the outside portions of each scraper member are releasably connected together. Each central portion has engagement surfaces disposed in opposite relationship in the longitudinal direction of the assembly for the engagement of the teeth of a pin gear. On its outside at both sides, each central portion has flanks with oppositely disposed openings for receiving the end links of the chain portions therein. Each flank is arranged to receive, and to be secured, an outside portion.

Abstract: Methods are provided for translating a face support comprising a plurality of support units arranged side-by-side at an initial position. In the first embodiment, a first pair of alternately positioned support units are moved a predetermined distance from the initial position. Next, a second pair of alternately positioned support units are moved the predetermined distance. One of the support units of the second pair is positioned between the first pair. These moving steps are repeated until the entire plurality of support units is moved the desired distance. In the second embodiment, the first moving step is duplicated. Then, a single support unit located between the first pair is moved the predetermined distance. These two moving steps are repeated until all of the support units are moved.

Abstract: A method and device is provided for the moving of a shield-type support trestle 1 having stamps 4, 5 arranged between a roof pressure cap 3 and a lying skid 2, a pushing ram 6 is in the lying skid 2, and control valves 11, 12, 13, 14 for controlling the desired functions of the shield-type support trestle 1. The stamps 4, 5 have an inlet valve 22 and a discharge valve 4. A pressure line 40 is provided between control valve 13 and the pushing ram 6. A valve 51 is provided which is controlled by the pressure in the pressure line 40 and by which interconnects stamp pressure chambers. A manometric switch 48 is arranged on the pressure line 40 and activates an electronic control device 42. In lines 53, 55, and 29 between the stamp pressure chambers and the return line 18, an unlockable reflux valve 54 is provided which is actuated through the electronic control device 42 and the discharge valve 24.

Abstract: A transfer station which includes an elongated main frame, a conveyor movably mounted in the elongated main frame; a feeder box comprising opposite feed devices connected to opposite sides of the elongated main frame, each feeder device including a box compartment which can be tilted to discharge debris deposited therein onto the moving conveyor; a crusher mechanism for crushing debris carried thereto by the moving conveyor; a discharge chute for discharging the crushed debris into a hauling device; and lifting devices attached to the elongated main frame to lower it onto the ground and place the transfer station in a lowered, operational mode, or raise it above the ground and place the transfer station in an elevated transport mode. Once the transfer station is in its elevated, transport mode a caterpillar tractor can be positioned under the elongated main frame to transport the transfer station to another processing location.

Abstract: A curve-negotiating conveyor particularly for use in underground mining operations wherein the conveyor can be designed to any desired length since it compensates for the extension of the conveyor track occurring over the extended length of the conveyor without the positively operating driving devices becoming disengaged. The conveyor has a track forcibly guided on an undercarriage, the links of the track being flexibly joined to one another and the track resists tension and compression. The undercarriage is comprised of undercarriage segments being flexibly joined to each other and having limited lengthwise displacement. Some of the individual segments of the undercarriage are connected with driver devices having sprocket wheels that positively engage the conveyor track.

Abstract: A roof cap assembly of a roof support mechanism includes a main cap having extension bearing portions at its front end, a forward cap which is pivotally attached at its rear end to the extension bearing portions of the main cap, and two supporting cylinders connected between the main cap and the forward cap at spaced apart locations across their widths and so as not to extend therebelow. The supporting cylinders include a housing containing twin pistons and an adjustable pressure transmitter is provided for each supporting cylinder and is constructed to increase the pressure in the pressure chambers therein when the pressure of the pressure medium supplied thereto exceeds a minimum set value.

Abstract: A coal shaver includes an elongated carriage body that can be pulled by a link chain back and forth in parallel with the side wall of a coal deposit and two shaver devices respectively mounted on the elongated carriage body near its opposite ends. Each shaver device includes a first cutter member which includes a first elongated cutter strip of vertically spaced apart shearing blades that extend inwardly of the coal shaver, i.e., toward the first elongated cutter strip of the other shaver device, and towards the side wall of the coal deposit, and a second cutter member which is pivotally connected to the first cutter member so as to pivot about a horizontal axis, the second cutter member including a second elongated cutter strip which faces outwardly of the coal shaver and towards the side wall of the coal deposit.

Abstract: A foot element of an adjustable roof support mechanism includes side walls that have aligned guide grooves in their facing surfaces and a spherical bearing surface in a floor portion therebetween. The guide grooves include inclined entry portions and enlarged terminal portions. A cooperable, extendable strut element includes a tubular body having a spherical lower end and two cams extending away from opposite sides near its lower end. The cams are shaped so as to fit within the guide grooves of the foot element. When attaching the strut element to the foot element the cams thereof are moved along the entry portions of the aligned guide grooves and into the terminal portions thereof. Thereafter, the strut is rotated into a use position. When in its use position, the cams cannot be removed from the terminal portions of the guide grooves, thus preventing unintentional separation of the strut element and the foot element.

Abstract: A mobile transfer station includes a support structure; a conveyor movably mounted on the support structure; and a feeder device located on one side of the conveyor, the feeder device including a box compartment for receiving bulk materials to be treated by the mobile transfer station and which is pivotally mounted on the support structure to be tilted relative to the conveyor to deposit bulk materials thereon, and metering humps mounted on the support structure and fitting within recesses in the box compartment, the metering humps having upper surfaces which are inclined downwardly toward the conveyor.

Abstract: A coal shaver which includes cutter fronts also includes shearing blades and bottom blades at both ends of the coal shaver, for extraction work in both shaver cutting directions; the coal shaver having shearing blades attached to the shaver body and bottom blades attached to the shanks, which are arranged to be adjustable and locked in guides at the shaver body. The coal shaver is designed such that the shearing blades are attached to the cutter strips, which are arranged to be pivoted at the shaver body around its longitudinal axis, and the bottom blades are attached to the shanks, arranged to pivot around the swivel bolt, which is attached across the mining direction, and is guided such that it is movable in the longitudinal direction in the coulisse guides at the shaver body.

Abstract: A self-advancing roof support for the face roof support in underground mining operations, having a plurality of supporting frames with self-advancing mechanisms acting perpendicular to the breast of the working, which mechanisms advance the supporting frames in the direction of the breast of the working. In order to facilitate the relocation of a winning face equipped with such a self-advancing roof support, these supporting frames have a plurality of self-advancing gears acting parallel to the breast of the working, to successively shift the supporting frames in the lateral direction parallel to the breast of the working, so as to produce a cut or road for the installation of a new winning face at a head side of the face equipment and to advance the self-advancing roof support sideways into the road together with the complete face equipment while maintaining the formation.

Abstract: A feeder box for dumping bulk materials onto a conveyor of a mobile transfer station comprises at least one feeder device located adjacent a side of the conveyor, each feeder device including a box compartment and a support structure for the box compartment, the box compartment being pivotable with respect to the support structure so as to tilt towards the conveyor to dump bulk materials onto the conveyor.

Abstract: A shield-type support frame for serving as a face support in underground mining operations having a bottom structure, a one-piece roof cap, at least one hydraulic plunger connecting the bottom structure and the roof cap and two shield elements arranged side by side, which can be adjusted in height separately and which are each pivotally connected to the bottom structure and the roof cap. Joint connections between each shield element and the roof cap permit tilting of the roof cap relative to the shield elements about axes extending in the forward direction.

Abstract: A remote controlled bolt removing device for bolts securing the head of a reactor pressure vessel is provided which includes a vertically movable rotating device which automatically grips and turns the bolts and at least one hydraulic cylinder for raising and lowering the rotating device. The device is provided with a rotating drive associated with the hydraulic cylinder which imparts a relative rotating movement between the piston and the cylinder during the operating stroke.

Abstract: A rail assembly for supporting the wheels of underground wheeled coal-getting machines, in combination with a coal conveyor comprising a plurality of conveyor pans interconnected end-to-end in the direction of movement of the machines with the central axes of adjoining pans being angularly related, the assembly comprising a rail section mounted on each pan with each section including at least three rail elements having adjoining ends interconnected for relative movement along such direction, so that the upper surfaces of the rail sections lie parallel to the central axes of the pans and the rail assembly is thereby made to follow the undulations of the conveyor when mounted in place.

Abstract: The invention relates to a structural frame for mining operations wherein at least one stabilization element is provided and coupled between the roof of the seam cap and the floor of the seam support base which is pivotable around a pivot axis extending in the longitudinal direction of the truss. In order to prevent damage to the stabilization element or the pivot axis during occuring mountain forces, the stabilization element and/or the guides or links guiding the same are designed as yielding spring elements yieldable against compression and tension forces whose restoring forces are dimensioned so large that the parts which have been released from the bracing between the roof of the seam and the floor of the seam can be adjusted back into the initial position by the effect of the restoring forces.

Abstract: An annular clamp ring of aluminum material has a plurality of through bores for the reception of cover bolts and associated cover nuts to facilitate the securing and removal of a cover over a pressure vessel. The bores are of stepped diameter and high-pressure seals are provided in the ring bores and at the stepped diameter.