| 摘要 |
The present invention provides a blackboard having a function of lifting a writing board, comprising: a frame (10) having a space portion formed therein; a writing board (20) arranged on the space portion formed inside the frame (10), to be able to be lifted; and a lift adjusting member which is filled with pressure fluid, maintained by the frame (10) by having a piston (34) as one end portion, capable of having its withdrawal adjusted through the pressure fluid, and making a lift adjustment of the writing board (20) by the withdrawal of the piston (34) connected to the writing board (20) and the pressure fluid. |
