Abstract: The present invention relates to a driving device for signs having movable display screens which are multilateral and simultaneously rotatable by means of a driving unit for providing a number of continuously recurrent pictures corresponding to the number of sides on the display screens. Some of the display screens comprise two toothed pulleys of which one is adapted to cooperate with a toothed belt for transferring the driving power of the driving unit from a preceding display screen. The other pulley is adapted to cooperate with another toothed belt for transferring the driving power to a succeeding display screen. In order to facilitate setting of the display screens relative to each other by tightening and loosening of said toothed pulleys and by preventing toothed pulleys for the same display screen from rotating relative to each other during setting, both toothed pulleys for the display screen form part of a toothed twin-pulley as toothed portions which are fixedly connected to each other.

Abstract: A sign formed from plural trilateral display screen assemblies, each assembly being rotatable to dispose one of three screen sides in a forward position, wherein all corresponding screen sides in such forward position collectively defining and displaying a picture.

Abstract: A display having a frame and prisms rotatably mounted therein, each of the prisms including adjacent longitudinally extending side surfaces so that each set of associated side surfaces of the prisms provides a display when rotated to a side by side position defining a permanently recurring sequence with the number of displays corresponding to the number of side surfaces on each prism. Each prism is provided with a pair of rotation axles disposed at opposite ends thereof. A drive motor and a transmission rotate the prisms synchronously, the drive motor being connected to one of the rotation axles. Gear discs are mounted on one rotation axle of each pair provided on the prisms with at least one belt mounted on the gear discs for rotating the gear discs and the prisms when the one rotation axle is driven by the drive motor, the belt being toothed for meshing with the gear discs.