Meshing gears 1 and 4 rotate about fixed axes A and B and are connected by turning pairs C and D to links 3 and 2 which are connected together by turning pair E. The dimensions of the links comply with the conditions: r₁=2r₄ and C͞E=D͞E=2r₁ where r₁ and r₄ are the pitch radii of gears 1 and 4. In the initial position (as shown), lines AC and BD are parallel to horizontal axis Ax and are directed to the right. When gear 1 rotates, various points of connecting rods 2 and 3 describe the complex connecting-rod curves shown. The shapes of the curves can be changed by varying the distances A͞C and B͞D.
$2480$LrG,Ge$