Means having at least one movement unit

The device has a movement unit (3) articulated on a frame (2) via three adjusters (1). When stationary and when the movement unit (3) is travelling, the adjusters (1), which can be pivoted via coupling members (4, 6) in relation to the movement unit (3) and the frame (2), are always under a given tension. Thus the movement unit (3) is highly statically and dynamically rigid and moves linearly as there is no return clearance in the coupling members (4, 6).