Device for controlled telescoping of multistage telescopic tubes in height-adjustable adjusting gear-operated constructions and method of using the device to synchronise the sequence of movements of all moveable and hence visible tube sections (2) of multiple interacting, non-enclosed telescopic tubes (1), essentially characterised in that the tube sections, which are free to move in a multistage telescopic tube and which normally have their sequence of movements uncontrollably influenced by the frictional resistance of the slide bearings, are provided with at least one movement-transmitting guide roller (8) provided with at least two sharp-edged, circular and hardened elevations (10) having a diameter which is greater than the distance between the tube walls of the tube sections most immediately adjacent to the roller, and that said guide rollers are designed, when being assembled into a complete multi-stage telescopic tube, to cut grooves into the tube walls with which they come into contact, and thereby to controllably guide the visible tube sections so that at all times they exhibit a constantly recurring sequence of movements, which at the same time makes it possible in a larger construction to use multiple interacting and identical telescopic tubes, all moveable and hence visible tube sections of which automatically acquire a fully synchronous sequence of movements if all adjusting gear and telescopic tubes in the construction start from a common level.
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