| 摘要 |
A sliding surface for a drafting board allowing a draftsman to adjust a sheet of drawings on the drafting board by moving the drawing up and down without having to adjust or realign the drawing to maintain the square and straight lines thereof, the device consisting of a pair of oppositely wound rollers disposed in tandem spaced apart parallel relationship at the top and bottom edges of a drafting board and over which a flexible sheet of material is wound so as to overlie the top surface of the drafting board and provide a sliding surface thereon in that a sheet of drawings taped to the sliding surface will move therewith as it passes in an upward direction to roll onto the top roller and a downward direction to roll onto the bottom roller so that the top of the sheet of drawings may be brought to the bottom portion of the drafting table, and vice versa, thus allowing the draftsman to move the sheet of drawings up and down along the drafting board without having to readjust or realign the drawing sheet.
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