Patent ID: 7571559

Claim:
An image-changing signboard, comprising: an upper and a lower horizontal frame member having a substantially U-shaped cross-section with two opposite legs and a web interconnecting the legs; two opposite, vertical side frame members connecting the horizontal frame members; a plurality of vertical bar-shaped display elements having a triangular cross-section and rotatably mounted in the upper and lower frame members; individual gear units mounted in one of the horizontal frame members for rotating a respective display element, each of said gear units comprising a drive wheel having at least one claw for intermittently engaging a driven, triangular gear wheel connected to a respective display element; a drive motor connected to a common drive shaft for simultaneously rotating the respective drive wheels of the gear units, and a plurality of the gear units are mounted on a common mounting plate so as to form a drive module, which is slidably mounted on tracks on the legs of said one of the U-shaped horizontal frame members and which form a bottom plate bridging the gap between the legs of said one frame member.