Abstract: For use in underground mining, in particular coal mining, a chain belt is provided, which consists of the standard vertical links and horizontal links which preferably have double helical surfaces. These horizontal links with the double helical surfaces are connected to a symmetrically constructed pusher, whereby either the base and the guide shoes, or only the base are shaped symmetrically. The symmetry plane is exactly in the center, when viewed in conveying direction, so that such a pusher can be reversed either in relation to the base or in its entirety, or together with the entire chain belt. This results in much higher lifespans.

Abstract: Chain webs for chain conveyors, which are primarily used in underground mining and in tunnel building for the transport of large quantities of materials, consist of mutually engaging horizontal and vertical chain links in which the horizontal links of the two adjacent chains are joined by a one or two-piece bracket running across their longitudinal direction, sufficiently raised above them and having a reversible tooth shape. This results in a kind of toothed chain providing the optimum power transmission from the chain wheel to the chain web, where both chains run exactly in the middle of the belt, as is usual in double-centered chain conveyors. The special shape of the reversible teeth makes it possible to use such a chain web on both sides and to move it forwards and backwards without any risk.