Drafting apparatus

Claim 1

A drafting table comprising a flat board and a flexible member travelling about the board, the board having two straight parallel edges, an idler roller at each parallel edge and at right angles to the travel of the flexible member, the flexible member passing about the board over the idler rollers and kept taut, the flexible member being such that a drawing can be fastened thereto and can be conveyed about the board, the flexible member including parallel, spaced-apart end edges, and spaced-apart, parallel elastic tension members extending between the end edges at right angles thereto for tensioning the flexible members, wherein the resilient tension members apply tension over different longitudinal areas of the flexible member, compensating for the different conditions affecting the flexible member, the tension members being spaced further apart near the center of the flexible member than they are near the longitudinal edges thereof, a plurality of additional idler rollers below the board and parallel with the idler rollers at the edges of the board, the flexible member being threaded through the additional rollers whereby additional drawing surface area is provided by the flexible member.