Driving device

A driving device comprising:

• a frame;
• and
• a screw-nut system comprising:
• a threaded rod connected to the frame by a pivot connection that allows the threaded rod to rotate with respect to the frame about a longitudinal axis of the threaded rod, the threaded rod comprises a first thread and an additional thread having a pitch that is different from a pitch of the first thread;
• a first nut helicoidally connected to the first thread of the threaded rod;
• and
• an additional nut helicoidally connected to the additional thread;
• a first position sensor configured to detect a limit position of the first nut along the longitudinal axis, the first position sensor comprising a first part and a second part, the first position sensor being sensitive to a variation in a distance between the first part and the second part of the first position sensor along the longitudinal axis,
• wherein the first part of the first position sensor comprises a first push-button switch being fixed to the first nut and the second part being fixed to the additional nut and thereby being connected to the threaded rod without passing via the pivot connection and in such a way that rotation of the threaded rod about the longitudinal axis leads to the variation in the distance between the first part and the second part of the first position sensor along the longitudinal axis;
• and
• wherein the second part of the first position sensor comprises an actuator for actuating a push-button of the first push-button switch in order to bring about a change in state of the first push-button switch, the actuator forming a stop configured to move closer to the push-button of the first push-button switch when the threaded rod is rotated in a first direction, such that the stop is operable to change a state of the first push-button switch when the stop contacts the push-button of the first push-button switch.