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Automatic erasing device for erasing chalk marks on a writing board by water
Automatic erasing device for erasing chalk marks on a writing board by water
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机译：自动擦除水上书写板上的粉笔痕迹的自动擦除装置
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摘要
An automatic erasing device is used for erasing chalk marks on a writing board, and includes an erasing mechanism having an elongated housing disposed frontwardly of and slidable relative to the writing board along a longitudinal axis. The housing extends in a transverse axis relative to the longitudinal axis, and has a rear wall formed with an elongated rear opening to confront the writing board, and a lower portion formed with a water tank. An eraser unit is disposed within the elongated housing, and is biased to protrude outwardly and rearwardly of the rear wall via the elongated rear opening for abutting against the writing board. The eraser unit is connected to the water tank in such a manner that water flows from the water tank into the eraser unit so as to soak the eraser unit while the eraser unit moves on the writing board.
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