Drive arrangement for transport vehicles

A drive arrangement, particularly for driving elements such as movable steps and doors on vehicles, comprising a driven element manually movable between operative positions;

• motorized means for moving said element, including a turnable shaft coupled to said element, and a motor coupled with said shaft for turning the latter about its axis and for moving said element between said operative positions;
• means for uncoupling said motor from said shaft so that said element can be manually moved;
• and switching means having first parts spaced from and about said shaft and second parts mounted on said shaft for joint rotation therewith and having respective angular orientations relative to said shaft, said second parts each being turnable with said shaft to and from a control position relative to said first parts, in which control positions said second parts cooperate with said first parts for controlling the operation of said motor so that manual movement of said shaft upon uncoupling of said motor therefrom enforces movement of said second parts to said control positions, whereby subsequent actuation of said motor is facilitated.