Patent ID: 6835061
Filing Date: 2004-12-28
Classification: B29C

Abstract:
Device for carrying out a substantially two-stage linear movement comprising:a stationary structural unit; a displaceable structural unit; at least one first electromechanical drive unit mounted on the stationary structural unit; at least one shaft rotatably driven by the first drive unit and having a region with external thread; at least one tube with internal thread, which tube is disposed coaxially relative to the respective shaft, is displaced with the displaceable structural unit and is in operative connection with the external thread for the displacement of the displaceable structural unit; separating means for a separation of the shaft at least from a further flow of force when at least one predeterminable condition is obtained, the predeterminable condition includes at least one of a translatory position of the tube and a predeterminable axial force; at least one second drive unit, which is actuatable once the predeterminable condition has been achieved, wherein the tube extends through the stationary structural unit and is displaced relative to the stationary structural unit when the first drive unit is actuated, the separating means being jointly displaceable with the second drive unit and, when the predeterminable condition is achieved, the tube is firstly coupled in a detachable manner to the second drive unit and in so doing separates the shaft at least from the further flow of force, which is produced by the second drive unit, as soon as the second drive unit is actuated alone, and that the separating means works radially on the tube.