| 摘要 |
FIELD: personal use articles.SUBSTANCE: drawing instrument comprises a drawing board, a ruler with two rollers mounted on it, two flexible elements covering crosswise these rollers. Two mechanisms of locking the ruler are mounted on the ruler ends. Guide rails with grooves are attached to the opposite ends of the drawing board. Along the two grooves the slides are moved, mounted in the locking mechanisms and ensuring the installation of the ruler at a distance of 0.5-1.5 mm from the upper surface of the drawing board. The handle for the movement of the ruler is mounted on its upper surface in the space between the rollers. Two tension adjusters of flexible elements are mounted in the upper corners of the drawing board. Two set squares with screws for fastening the flexible elements are mounted in the lower corners of the drawing board. The height of the tension adjusters and the set squares provides the position of the flexible elements parallel to the drawing board plane.EFFECT: increase in the usability of the drawing instrument.15 dwg |
