Abstract: A safety armature for a cylinder having a key aperture or keyway, comprises a safety element which is in the form of a magnetically encodeable closure which can be opened by a magnetically coded disk and, which, in its locked position, covers the key aperture or keyway. The magnetically codeable closure may either be a magnetically encodeable padlock having a steel shackle which is held between guide disks of a guide element on the safety armature, or a solidly mounted mounting with a slide unit which is movable on the mounting and that can be latched by means of the magnetically encodeable enclosure.

Abstract: A vehicle wheel having a detachable rim ring with a rim flange. The fastening means for the rim ring may be covered by a detachable plate which also seals off an air duct which leads to the hollow interior of the tire.

Abstract: A braking device for sleds, according to which rollers are used as braking elements which by means of an actuating element are moved from a non-braking position into a braking position while being pressed against the surface of the sliding path for the sled. According to a preferred design of the invention, pairs of rollers are employed with the rollers of each pair having different diameters.