switch or control cables for switching - over or changing - over deflectors are known and have the disadvantage that they can only be operated from one predetermined location . in accordance with the invention , the switch or control cable is subdivided into two switch or control cable sections which are interconnected by a coupling . the switch or control cable which is tensioned by a spring can now be selectively released from a holding device for switching - over or changing - over the deflector and displaced by the spring or by disengaging the coupling , in which case only one of the two switch or control cable sections is displaced by the spring .