The invention concerns a device comprising at least one door leaf (4) with an outer side (5) and a secured inner side (6). In an approximately central position the door leaf (4) secures a walk-through cabin (7) against entry and exit. To this end, there is mounted on the door leaf (4) a panel or rod (8) which can be moved in dependence on the pivot position of the door leaf (4) by a control device (9) comprising a steering device (10). According to the invention, the steering device (10) is disposed on the door leaf (4). With the device according to the invention, the panel- or rod-steering linkage is no longer connected to the door lintel via the door, as previously, but is mounted directly on the door leaf (4). It is therefore possible to dispense with the voluminous casing conventionally used hitherto.