| 摘要 |
PURPOSE: A blackboard eraser can erase the chalk powder on blackboard with wet paper subsidiary material so that note taking on new contents becomes easy. CONSTITUTION: A blackboard eraser comprises an eraser body (2) having space inside and wrinkle on the side; a water storage chamber (4) located in the eraser body's space, storing water, and having holes on the side; a water channel (8) combined with the water storage chamber and sending water to the lower part through a hole; a plug member (3) opening and closing the water feeding part of the water storage chamber; a spring (6) located within the space of the eraser body and connected to the eraser body; a switching apparatus (11) which opens and closes the water channel, connected to the spring; and an erasing member (10) combined with the water channel, absorbing and removing the powder on the blackboard by absorbing water ejected through the water channel.
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