Draw bar with a fixing device

A trailer coupling (10) with a coupling arm (20), wherein the coupling arm is mounted on a vehicle bracket (30) by means of a bearing arrangement (31) so as to be pivotable and/or displaceable between a position of use (G) and a non-use position (N), wherein the trailer coupling has a fixing device (95), wherein the trailer coupling for holding the coupling arm on the vehicle bracket in the position of use and/or the non-use position as a fixing position has form-locking contours arranged on the vehicle bracket and the coupling arm which engage with one another in form-locking engagement, wherein a first form-locking element (71) and/or a corresponding first counter form-locking element (72) has a curvature contour. A second form-locking element (81) and a second counter form-locking element form a wedge surface arrangement with a wedge surface (89, 90), wherein in the fixing position the first form-locking element (71) and first counter form-locking element (72) are in form-locking engagement and permits a movement of the second form-locking element (81) and second counter form-locking element (82) in their form-locking engagement in the sense of a wedging action.