| 摘要 |
PURPOSE: An on-off blackboard possible to adjust height is provided to easily and safely set up a on-off blackboard moving upward and downward without any trembling and give user the convenience and reduce the cost. CONSTITUTION: The on-off blackboard possible to adjust height comprises: frames(11,12) in upper and lower sides being fixed to the wall, frames(13,14) in the left and right sides with the height guiding grooves frontward fixing both edges to both sides of the frames in upper and lower sides, a blackboard(2) mounting a height adjusting bar(21) being lifted after being inserted into the height guiding grooves in the left and right frames(13,14) to both sides of the rear face, a height position keeping unit(100) keeping the moved position of the height bar(21) of the blackboard along the height guiding grooves in the left and right frames(13,14).
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