MULTIPLE-BAR PANTOGRAPH MECHANISM

The lengths of the links comply with the conditions: B͞C=E͞D and C͞D=B͞E, i.e. figure BCDE is a parallelogram linkage. Point F of link 4 lies on a straight line passing through points A and G of links 1 and 3. For any configuration of parallelogram linkage BCDE, points A, F and G lie on a single straight line. When link 4 turns about fixed axis F, selected as the centre of similarity, and one of t…