Patent ID: 6948210

Claim:
A system for automatic erasure of a board, said system comprising: a motor; a rod having at least one gear, said rod being positioned proximate to one side of the board, and said rod capable of being rotatably driven by said motor; at least one threaded rod extending at least substantially over the length of the board, said at least one threaded rod having at least one counterpart gear that is coupled against the at least one gear of said rod; an eraser member having at least one threaded opening to receive said at least one threaded rod; at least one non-threaded rod that extends across the board to guide said eraser member as said eraser member is being moved across the board; at least one sensor operatively connected to said motor, said sensor operating to deactivate said motor and reset said system such that the driving direction for said eraser member is reversed after said eraser member has completed a pass across the board; and a user switch to activate said motor, wherein upon activation of said motor, said rod is rotatably driven to rotate the at least one gear as well as the at least one counterpart gear coupled thereto, thereby causing said at least one threaded rod to rotate and thereby move said eraser member across the board to erase non-permanent markings from the board.