| 摘要 |
FIELD: mechanization of drawing and graphic work; devices for drawing parallel lines through preset interval at any angle. SUBSTANCE: drawing device has drawing board and T-square connected with drawing board by means of two identical pantographs, each of which has a couple of longitudinal and transverse hinged levers. One of levers of each pantograph is connected with drawing board, and one of transverse levers of each pantograph is hinged with T-square. Pantographs are hinged with each other by one of their longitudinal levers. Pantographs are located from the rear side of the drawing board with which one of longitudinal levers of each pantograph is hinged. Pantographs are additionally connected with each other by the other longitudinal levers of pantographs between each other is effected by means of two equal-link parallel link mechanisms located at different levels. In this case, two opposite parallel links of each mechanism are connected with corresponding levers of pantographs, and two other opposite parallel links of each mechanism are installed by means of runners on the vertical guide fastened to drawing board whose longitudinal axis coincides with vertical axis of symmetry of drawing board. Besides, T-square has four-link parallel link mechanism consisting of two rules and two disks hinged with T-square by their disks for synchronous change of distance between T-square and rules in desired relation. EFFECT: higher efficiency. |
