so that the intermediate disc 3 is fixed in its position and can only carry out a rotary movement about the central shaft 10 of the rotary closure in the lower region the actuating handle butts with its inner bore on the nut 8 an upwards movement of the actuating handle 4 is prevented by a projection 11 on the nut 8 and the corresponding recess 12 in the actuating handle 4 an actuating shaft 13 is inserted into the coupling bush 7 the actuating shaft 13 is provided in its central region with teeth which engage in corresponding teeth of the coupling bush 7 and thus facilitate on the one hand a displacement along the shaft 10 and on the other hand a connection which is fixed against rotation to the coupling bush 7 in the chamber formed by the frame 1 and the base 2 a cable pulley 14 is arranged concentrically around the shaft 10 the cable pulley 14 has a groove 16 running round its circumference in which a traction element 17 for example a traction cable is accommodated for winding on or off a planetary gear is provided between the cable pulley 14 and the frame 1 to drive the cable pulley 14 a sun wheel 18 which is arranged coaxially around the actuating shaft 13 and as a drive gear can be connected by a coupling to the actuating shaft so as to be fixed against rotation belongs to this.