Return action brake unit for rotatable drive element has return lock formed by an at least partially frictionally engaging freewheeling clutch which has first freewheel element with first blocking face, and second freewheel element

摘要

The return action brake unit for a rotatable drive element has a wormwheel (10) interacting with a braking screw (14), and a return lock through which the drive element is coupled to the wormwheel. The return lock is formed by an at least partially frictionally engaging freewheeling clutch which has a first freewheel element with a first blocking face, and a second freewheel element. Blocking elements are provided for the first blocking face and in the blocking direction interact by at least partial friction engagement with the second freewheel element.