The profiled rails (6) have a rail sector (11) which can be moved out of the rail at an angle to the door via guide (9) against a restoring force and/or a pusher for each of the doors (3) which can be moved at right angles into the rail track to interrupt this. The rail sector (11) forms part of the rail (6) and can be moved along the guide (9) and has one end right angled (11a) and the other end terminated in an angled impact edge (11b) forming a trapezium in plan. Sector (11) moves out to the side at 45 deg to the rail length (6). The sector side opposite to its outward and inward side forms the short leg of the trapezoidal parallelogram and is carried rotatably on a roller (12) impacted by the door so as to activate the rail sector movement. The bearing for the guide (9) has an undercut C-shaped top-fitted slide so the sector (11) can move out against a tensile spring arranged between slide and rail (6).
