| 摘要 |
PURPOSE: An anti-slip device for movable blackboards is provided to allow a timing gear to be engaged with a timing belt to prevent a slip phenomenon between a board member and roller. CONSTITUTION: An anti-slip device for movable blackboards comprises a timing gear(22) and timing belt(24). The timing gear is fixed to and installed on top and bottom of a pair of roller members. The timing belt is engaged with the timing gear on the top end and bottom end of the board member. The board member is fixed by the timing belt. Velcro tapes are adhered to the timing belt and board member. The pair of roller members are rolled on an endless track.
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