| 摘要 |
PURPOSE: A variable advertisement board which uses square pillars is provided to successively display four kinds of advertisement designs, drawings, or letter in a single advertisement board. CONSTITUTION: A plurality of fixed pillars(106a) is arranged while being separated with a predetermined interval and rotates with respect to a center rotating axis at the same place. A plurality of moving pillars(106b) is arranged by being inserted one by one in a gap between two adjacent fixed pillars. The moving pillars are rotates with the center rotating axis while being horizontally shifted in a backward direction. The moving pillars returns again to an original position by being shifted in a forward direction. A plurality of pillar moving shafts(112) with a circular rod shape arranges a screw thread(116) on a center part surface and places a central axis side by side in forward and backward directions. A pillar moving motor(126) rotates the pillar moving shaft. A pillar rotating gear(120) is respectively installed in the upper surface of the fixed pillar and moving pillar.
|
