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: 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 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 crusher for breaking up large size pieces of material, particularly for breaking up coal, comprises a housing with a crank therein which is pivotally mounted adjacent one end in said housing and is connected to means for oscillating the crank upwardly and downwardly in respect to a crusher plate. The crank carries a bracket portion which provides a rotatable mounting for the crusher roller which includes a shaft portion having a plurality of arms extending radially outwardly therefrom which have forward faces which carry striking tools. The arms provide means for conducting a liquid through the arms to a discharge nozzle which is oriented to spray in a direction opposite to the rotation direction behind the striking tools.

Abstract: A single-chain conveyor comprises a chain which runs centrally on the bottom of a conveyor trough and which has pushers which are secured to the chain by over-chain brackets which are guided along the trough bottom. The underside of the chain brackets are provided with slide surfaces which are made of a plastic material to facilitate the gliding movement of the brackets over the bottom of the trough. Pusher arms are also advantageously provided with slide surfaces made of plastic which engage in angle-profiled guide surfaces of the side walls of the conveyor trough.

Abstract: A conveyor trough construction, particularly for scraper chain conveyors, comprises a conveyor having longitudinal side walls formed with a plurality of abutting sections, each having a longitudinally extending bore therethrough which aligns with the next adjacent section. The bores of adjacent pairs of sections terminate in inwardly bevelled ends, and a coupling bolt extends through the bores of adjacent sections and terminates at each of its ends with an inwardly tapered portion which is engaged in the inwardly tapered ends of the bores. Each section is provided with a side wall opening, which extends into the bore, and a locking spring is inserted in the opening and engaged over the coupling bolt. The bore of the sections is dimensioned to provide an axial clearance for the locking spring.