| 摘要 |
PURPOSE: An elevating apparatus of blackboard is provided to elevate the blackboard which is heavy and has wide width stably. CONSTITUTION: A fixing member(60) is closely fixed in the wall, in which the blackboard is installed, leaving regular interval in the both side. In the upper and lower part of the fixing member, a transfer screw(50) is combined with a screw cap(70)(71) by being inserted. The transfer screw which is combined with the screw cap has regular width and breadth, and a pair is installed in the rear side of the blackboard frame(30) horizontally, in which blackboard is attached in the front side, leaving regular distance. The transfer screw(50) is installed to rotate by being combined with each reduction part(20) which is installed and fixed in the rear side of the blackboard frame. The reduction part is formed to reduce each rotation power of a motor installed and fixed in the rear side of the blackboard frame. Each motor is driven by the motor driver to have the same rotation and the same rotation direction.
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