Abstract: The invention is directed to a device for axially and externally mounting an expandable sleeve onto, and dismounting the sleeve from, a cylinder. The subject device comprises an external fluid-transmission means for expanding the diameter of the expandable sleeve by introducing a fluid capable of expanding the sleeve between the inner surface of the sleeve and the outer surface of the cylinder. The requisite sleeve expansion is accomplished without transmitting fluid from within the cylinder during the mounting and dismounting operations. The sleeve is contractable by the removal of the fluid.

Abstract: In an apparatus for contactless guiding of webs of material, in particular metal strips, by means of a gas medium, nozzle boxes are disposed above and below the web of material. The distances of the nozzle boxes from an imaginary, essentially horizontal center plane extending in the direction of transport differs individually or in groups. The positions of the outlet planes of the nozzle boxes are adaptable to the wave form, and each wave trough and each wave crest of the wave form is formed by at least two adjacent nozzle boxes.