Piston 1 reciprocates in cylinder 3 which turns about fixed axis A. Piston 2 reciprocates in cylinder 4 which turns about fixed axis B. Piston rods a and b of pistons 1 and 2 are connected by turning pairs D and C to crosspiece 6 which, in turn, is connected by turning pair E to link 5. Link 5 reciprocates in fixed guides d. Upon independent motion of pistons 1 and 2, actuated by fluid delivered to cylinders 3 and 4, link 5 reciprocates. The displacement of link 5 is proportional to the sum of the displacements of pistons 1 and 2.
$3948$LHP,Dr$