Patent ID: 9543804
Date: 2017-01-10
CPC Classifications: A47C,F16H,H02K

Claim:
1. An electric motor-actuated linear drive for adjusting moveable parts, the drive comprising: a drive motor, a threaded spindle, a speed reduction gear arranged between the drive motor and the threaded spindle, a spindle nut being carried on the threaded spindle, the spindle nut being selectively arrestable in a direction of rotation, and being displaceable in an axial direction of the threaded spindle in dependence on the direction of rotation of the threaded spindle, and a stroke element drivable by axial movement of the spindle nut for adjusting the moveable parts, wherein a drive wheel of the speed reduction gear is fixedly connected to the threaded spindle, wherein the stroke element is guided non-rotatably with respect to its longitudinal axis in the axial direction of the threaded spindle, wherein the spindle nut is coupleable to the non-rotatably guided stroke element, such that the spindle nut is selectively connectable non-rotatably thereto or is releasable therefrom, wherein a wrap spring couples the stroke element with the spindle nut, wherein an end of the wrap spring toward the stroke element is connected to the stroke element, wherein the wrap spring tightly surrounds the spindle nut in a normal condition of the wrap spring and connects the spindle nut non-rotatably to the stroke element, and wherein the coupling is releasable by actuation and enlargement of an end of the wrap spring remote from the stroke element.