Patent ID: 7789412

Claim:
An adjusting device for a fifth wheel coupling, comprising: a displacement device comprised of two guide rails disposed longitudinally on a vehicle, particularly on a tractor of a tractor and semi-trailer combination, and further comprised of a slide which is displaceable on the guide rails, and an actuating device for displacing the slide during travel of the tractor and semi-trailer combination, wherein the actuating device is configured so as to maintain a form-interlocking relationship between a frame and the slide during the course of the displacement; wherein the actuating device for accomplishing the displacement of the slide is comprised of a first motor drive; wherein at least one first position sensor is provided, for determining the position of the slide, where at least the said first position sensor and the first motor drive are connected to a common control device; and wherein the control device is configured so as to evaluate position signals from the first position sensor and to compare said position signals with set-point values dependent on the vehicle speed, and then to send control signals to the motor drive.