Abstract: A coupling for shafts and the like, comprising a sleeve having a passage adapted to receive the end portions of two aligned shafts, an outer circumferential surface having two axially spaced sections which conically diverge towards each other, and a radial flange intermediate the sections; a pair of pressure rings each surrounding one of the sections and having a conically tapering inner circumferential surface complementary to the respectively surrounded section; and bolts connecting the pressure rings with the flange and operative for pulling the pressure rings axially towards each other and towards the flange to thereby compress the sleeve radially inwardly into frictional engagement with shaft end portions located in the passage.

Abstract: A coupling unit for coupling a shaft to a surrounding hub has an inner ring which surrounds the shaft and is in turn surrounded by an outer ring. The juxtaposed surfaces of the two rings define with one another two wedge-shaped annular gaps which taper towards each other axially of the rings. Tension members are inserted into these gaps and both extend through the tension members so as to draw them axially together in order to force the rings against the shaft and the hub, respectively. An abutment ring is located between the inner and outer rings and has circumferentially spaced bores some of which are smooth and some of which are tapped. By cooperation of the bolts and the abutment ring the tension members can be forced out of the respective gaps when the connection between shaft and hub is to be released.

Abstract: An inner annular member of the arrangement surrounds the shaft and has an outer circumferential face two sections of which conically taper in mutually opposite directions. The inner annular member is also provided with a radially outward extending collar intermediate these sections. A pair of outer annular members each surround one of the sections with clearance and have an exterior cylindrical surface and an interior surface having a taper opposite to that of the respective section to form therewith a wedge-shaped annular clearance. The outer annular members abut from opposite axial ends against the collar. Tension members are received in the respective clearance and are drawn by both or the like inwardly of the clearance so as to force the inner member against the shaft and to the outer members against the surrounding hub, thus coupling the hub and the shaft for joint movement.