Patent ID: 8919003

Claim:
A drawing board assembly comprising: a board having a top surface and a bottom surface, having a left edge and a right edge, and having four corners; a pulley mounted in each of the four corners on the bottom surface of the board; and a flexible elongated member having two ends that is routed around the four pulleys such that a first portion of the elongated member is parallel to the left edge of the board and a second portion is parallel to the right edge of the board; means for joining the two ends of the flexible elongated member and keeping it in tension; and a straight edge member on the top surface of the board, the straight edge having a left end and a right end, the left end riding along the left edge of the board and the right end riding along the right edge of the board; wherein the left end of the straight edge member is attached to the portion of the elongated member that is parallel to the left edge of the board, and the right end of the straight edge member is attached to the portion of the elongated member that is parallel to the right edge of the board, and wherein as the straight edge member is moved from a first position on the top side of the board to a second position on top of the board it is always parallel to itself.