| 摘要 |
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.
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