The lengths of the links comply with the conditions: F͞E=B͞C and B͞F=C͞E. Link 1 rotates about axis A of the wagon frame and is connected by a screw pair to slider 2 which moves along guide b. Link 3 of four-bar linkage KHGB turns about axis K of the wagon frame. Link 4 of parallel-crank linkage BFEC is connected by turning pairs F and E to links 5 and 6 to which the axle ends of wheels d are rigidly attached. Wheels d with their axle ends are turned about axes B and C of the wagon frame by rotating screw 1 about axis A.
$2273$LS,FD$