Teleskopisk bevægelig konstruktion

摘要

A telescopically moving structure ( 1 ) comprising a nut ( 2 ) mounted in a rotationally fixed manner in relation to a frame part, a spindle tube ( 3 ) with an external thread in engagement with the nut ( 2 ), which spindle tube ( 3 ) furthermore has an internal thread ( 4 ) with the opposite direction to that of the external thread, which internal thread ( 4 ) is in engagement with a non-rotational spindle ( 5 ) provided with an external thread, the spindle tube ( 3 ) being connected in a rotationally fixed manner, but in the axial direction in a slidable manner to a driving shaft ( 6 ), wherein the driving shaft ( 6 ) has an essentially polygonal cross section with a perimeter forming two opposite longitudinal tracks for engagement with torque-transferring rolling bodies which are journalled in a bushing fastened in the spindle tube ( 3 ) to thereby enable transfer of a large torque without the risk of seizure between the driving shaft ( 6 ) and the spindle tube ( 3 ).