respective winch or the associated cable the load of the working platform assembly must then be respectively carried by the other holders and cables fig5 shows a cross section through a tower like building with a working platform assembly in accordance with the first embodiment the scissor lattice like carrier arms 5 of the working platform assembly are to be seen here in addition the working platform assembly has rollers 16 6 rollers are shown in this example but fewer or less can be used externally on the working platform assembly when the working platform assembly is extended the rollers then come into contact with the inside wall of the tower like building so that the working platform assembly 50 can be more easily moved upwardly or downwardly and damage to the inside wall of the tower and or the working platform assembly during the movement is avoided the platform includes a predetermined number of plates 17 which is greater by 1 than the number of carrier arms all plates 17 are of a circular round configuration in the present embodiment one of those plates includes a central rod see reference 60 in fig6 in order to close the central part of the platform the other plates 17 are each arranged on a respective carrier arm and fixed to the outer end of the carrier arm those plates are further provided with an opening slot 19 that opening 19 extends outwardly in a straight line in a radial direction from the center of the plate in that respect the opening is of a width which is slightly greater.