Patent ID: 8281677

Claim:
An electromotive linear drive, comprising: a drive unit comprising a drive motor; a spindle driven by the drive unit; a spindle nut disposed on the spindle, wherein the spindle nut is movable longitudinally on the spindle; a lifting tube operatively connected to the spindle nut so that the spindle nut moves together with the lifting tube; a connecting part disposed on a free end of the lifting tube; a braking assembly being operatively connected to the spindle nut via an adjustable, frictional connection; wherein the braking assembly is manipulable to adjust the frictional connection, wherein, during operation of the drive motor, the spindle nut frictionally engages the braking assembly, thereby preventing rotation of the spindle nut, wherein, with the drive motor turned off, the frictional connection is configured to be adjusted to permit the spindle nut to rotate with respect to the spindle, thereby manipulating a linear speed component of the lifting tube at least one bushing non-rotatably disposed on the spindle nut; at least one braking and transmission mechanism encompassing the bushing; a handle operatively connected to the braking and transmission mechanism permitting manipulation of the braking and transmission mechanism from a position exterior thereto: and a loop spring disposed on the at least one bushing comprising at least two coiled segments connected to each other by a central ridge disposed a predetermined distance from a median axis of the loop spring.