The apparatus comprises: two mutually rotatably arranged members (202 and 203); a drive member 261; and an axially adjustable coupling member (204); wherein the component (203) on the drive member (261) by means of axially adjustable coupling member (204) mutually connected; wherein the coupling member (204) is non-rotatably connected with the drive member (261), wherein the two parts are directly locked together and wherein the locking of the two components by means of an axial displacement of the coupling member (204) is releasable. Alternatively, it is provided that the coupling member (32) with the component (23) is rotationally fixedly connected, with the two components via the coupling member (32) can be locked together and wherein the locking of the two components by means of an axial displacement of the coupling member (32) is releasably ,