A cover assembly for a circular bearing port in the yoke of a universal joint comprises a plurality of separate cover segments configured and dimensioned for insertion into the port in positions coacting with each other to close the port. Each of the cover segments has an outer edge seated in a locking groove circumscribing an interior surface of the port. The cover segments are interconnected to form an integral circular cover, and the cover is rotationally fixed with respect to the yoke.

The invention relates to a stand change carriage (10) for simultaneously receiving and transporting a plurality of stands of a rolling mill for rolling metal rods, wires or pipes, the stand change carriage (10) comprising a plurality of stand places (16), one of the stands being receivable individually in each of the stand places (16), the stand change carriage (10) comprising a plurality of steerable wheels (20), in order to transport the stands on rails or along a rail-less mill floor, and the stand change carriage comprising at least one hydraulic motor (21) which is operatively connected to at least one of the wheels (20) in order to drive it.