Electric linear drive, in particular for adjusting furniture used for sitting or lying down

摘要

An electric linear drive, in particular for adjusting moveably mounted parts of furniture used for sitting or lying down, includes a drive motor, a threaded spindle, a speed reduction gear arranged between the drive motor and the threaded spindle, a spindle nut placed on the threaded spindle, which can be selectively locked in the direction of rotation and, depending on the direction of rotation of the threaded spindle, moved in the axial direction of the threaded spindle. The linear drive has a lifting element for adjusting the moveable furniture parts, the lifting element being driven by axial movement of the spindle nut. Simple design, easy assembly and operation, and robust mounting of the driving parts are achieved.

主权项

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.