The lengths of the links comply with the conditions: A͞B=C͞D=E͞F, A͞D=B͞C and A͞F=B͞E. Link 1 rotates about fixed axis A. Eccentric 4 is fixed and is encircled by collar a of link 5. Link 5 is connected by turning pair C to link 2 which, in turn, is connected by turning pair D to link 1. For the specified dimensions, the links of mechanism ADCB constitute a parallel-crank linkage. Link 3 is connected by turning pairs E and F to links 5 and 1. Linkage AFEB is also of the parallel-crank type. Link 3 enables the mechanism to pass through its extreme positions (dead points).
$634$LW,PC$