Abstract: A circular groove present on a journal on its end is utilized to provide a bayonet coupling on the journal without mechanical refinishing work to fix or clamp a ring piece axially on the journal. The clamped supporting elements of the bayonet coupling are formed as a divided supporting ring whose collar engages in the circular groove and is rigidly nonrotatably held in it. The circumferentially divided supporting surfaces of the supporting ring are assembled by attaching members correspond in the locked configuration with the interiorly directed circumferentially divided abutting surfaces of the clamped ring piece which form the rotatable portion of the bayonet coupling.

Abstract: An apparatus for connecting a cover to a chock in a rolling mill comprising spaced supports on the chock, an arm extending laterally from the cover into the space between the supports, and a pin extending through communicating openings in the supports and the arm. Certain of the openings are dimensioned in relation to the pin to accommodate axial shifting of the cover between a closed position against the chock and an intermediate position from which the cover is free to pivot about the pin to an open position exposing the bearing end. A disengageable retainer is provided for holding the cover in the closed position.