Abstract: Apparatus for clamping an overhung rolling disc on a drive shaft by compressive stress between plane parallel surfaces, whereby a hydraulically expansible tie-rod is inserted in the hollow drive shaft for producing the compressive stress, the tightening nut of which tie-rod is located opposite the outer end face of the rolling disc for transmitting the compressive force, wherein the tightening nut is seated on a bayonet ring provided with an external screw-thread, the bayonet ring with the tightening nut is supported by a bayonet nut, which is in turn screwed on a threaded end of the tie-rod and a taper sleeve is inserted between the rolling disc and drive shaft, the free outer end face of which taper sleeve is located opposite an end face of the bayonet ring and is constructed for the attachment of extraction claws.

Abstract: A wire rod rolling mill has a plurality of rolling stands with individual drive shafts connected to at least one main drive shaft through respective couplings which are selectively disengagable to interrupt the drive of the corresponding roll stand. The coupling means consist of meshing bevel gears on the main drive shaft and the respective roll stand drive shaft, and a slidable member rotationally fast with one of these shafts and slidable into and out of driving engagement with the corresponding bevel gear which is rotatable relative to the shaft. Alternatively, a similar coupling arrangement may be provided between two sections of the roll stand drive shaft, these sections being interconnected by spur gears. The sets of bevel gears between the main drive shaft and the rolling stand drive shafts are equal in their transmission ratios and the speed variation in the respective roll stands is achieved by spur gearing in the rolling stand drive shafts.