Abstract: A coupling lock for a trailer coupling. The coupling lock comprises a receptacle (9) in which a coupling element (6) is inserted, an angle measuring device (13, 19) is connected to the receptacle (9), and the angle measuring device (13, 19) is provided for detecting rotation of the receptacle (9), about a rotational axis (18), relative to the coupling element (6). A magnetically adhering body (24) is elastically connected to the receptacle (9) and magnetically connectable to the coupling element (6) for actuating the angle measuring device (13, 19).

Abstract: A coupling lock for a trailer coupling. The coupling lock comprises a receptacle (9) in which a coupling element (6) is inserted, an angle measuring device (13, 19) is connected to the receptacle (9), and the angle measuring device (13, 19) is provided for detecting rotation of the receptacle (9), about a rotational axis (18), relative to the coupling element (6). A magnetically adhering body (24) is elastically connected to the receptacle (9) and magnetically connectable to the coupling element (6) for actuating the angle measuring device (13, 19).

Abstract: An arrangement to establish a zero position for a sensor that serves to detect movement between parts of a technical system that are connected by a ball joint. The arrangement comprising a joint housing of the ball joint rigidly connected to a first part of the system, a ball pin rigidly connected to a second part of the system, and a sensor for detecting the movements of the ball pin. At least a first sensor element is disposed on the ball pin and a second sensor element is disposed on a part of the system that is immovable with respect to the joint housing. An axial area of the lateral surface of the ball pin is flattened and positively locks an inner contour of the mounting eye or a disk-shaped element which abuts the mounting eye and is fixed by positively locking with the second part of the system.