Abstract: The invention relates to a device for connecting fixedly in terms of rotation two coaxial components, for example a shaft and a hub, preferably with an outer and an inner sleeve which enclose a tapered annular space and in which a likewise tapered annular piston is axially displaceable by means of a pressure medium, as a result of which a radial tensioning force is exerted on the components to be connected. For this purpose, either one of the two pressure chambers on the two end faces of the piston is subjected to pressure. According to the invention, the pressure medium is conveyed to the rear pressure chamber by means of a duct which opens into the annular space in the front region of the annular piston and from there passes, via slots in the outer cylindrical surface of the annular piston, to the rear pressure chamber.

Abstract: In the field of fastening components together in such a way as to be able to transmit mechanical power, keyways and keys have been used; also, interlocking conical tapers have been used which are actuated either by a ring of screws or by oil-injection.The coupling according to the invention comprises an annular chamber housing an annular piston; the chamber and the piston have matching tapers. Oil is pumped into one end of the chamber to move the piston axially in one direction to cause radial expansion of the chamber to connect two components; oil is pumped into the other end of the chamber to move the piston in the opposite direction to disconnect said components.Uses of the coupling are, for example, to join the adjacent ends of coaxial shafts and to act as a locking bush to join concentrically arranged components.

Abstract: A belt conveyor of the extendible type wherein stools are provided which complete with respective upper and lower belt supporting elements can readily and reliably be introduced into the extendible portion of the conveyor during operation of the conveyor. Each such stool is provided with a gap at one side thereof and between its upper and lower elements to enable it to be inserted into the run of the conveyor in a direction transversely thereof. When so inserted the stool is disposed with its upper element above the lower run of the belt and with its lower element below the lower run of the belt.