Patent ID: 7699335

Claim:
Trailer coupling comprising a ball neck which can move between an operating position and a rest position and has a pivot-bearing body disposed at a first end and a coupling ball disposed at a second end, also comprising a vehicle-mounted pivot-bearing unit, in which the pivot-bearing body is accommodated such that it can pivoted between the operating position and the rest position by a pivoting movement about a pivot axis, and further comprising a rotation-blocking device which can be driven by a drive, the rotation-blocking device having at least one rotation-blocking body which can be moved in a guide direction with at least one component in the radial direction in relation to the pivot axis, the rotation-blocking body can be engaged with, and disengaged from, a receptacle by movement in the guide direction, an actuating body which has a pressure-exerting surface running transversely to the guide direction, said actuating body being moveable in an actuating direction and the movement of which in the actuating direction allows the at least one rotation-blocking body to be moved, and acted on, in the guide direction, and the drive being an actuating drive by means of which the actuating body can be moved in the actuating direction between at least one rotation-blocking position and a freewheeling position.