Patent ID: 6893039

Claim:
A fifth wheel coupling for coupling a semi-trailer tractor part and a semi-trailer part of a tractor-trailer unit, which comprises (a) a coupling device arranged on one part of the tractor-trailer unit, the coupling device comprising (1) a coupling ball and (2) a holding-down device (b) a ball cup affixed to the other tractor-trailer part, and enclosing the coupling ball in a coupling position permitting universal movement between the semi-trailer tractor and the semi-trailer, and (c) a butt part attached to a side of the ball cup and having a fastening end averted from the coupling ball for fastening the butt part to the other tractor-trailer part, (1) a free space being provided between an apex of the ball cup and the fastening end for free movement of the holding-down device relative to the ball cup.