rubber coating in the embodiment shown before this coating will be attached to the bottom of the ring shaped grooves 20 by choosing clockwise or anti clockwise rotation of the driving shaft 9 through the steering mechanism the supporting device 2 can be raised or lowered along the rope 1 next to the driving shaft 9 there is a pressure roller 26 at the last groove 20 which presses the rope 1 against the driving shaft 9 the rope having passed through the pressure roller 26 and the driving shaft 9 it is paid out and dropped freely the supporting device according to the embodiment of diagrams 5 and 6 differs from the above specified embodiment with regards to the design of the driving shaft 9 and in the fact there there is no by pass roller 10 all other parts being identical they will pass unmentioned in the following specification fig5 in particular shows that according to this embodiment the driving shaft 9 is formed by several rings 22 in tandem arrangement and carries ball bearings 23 which thus form the case of the driving shaft 9 struts 18 connect the rings 22 with the driving shaft 25 of the motor 7 on the other hand the rope 1 is helically looped around the driving shaft 9 a guide helix 24 fixed around the driving shaft 9 directing the spirals of the rope 1 by means of the ball bearings.