Cylinder 1 turns about fixed axis A. Piston 6 reciprocates in the cylinder and is connected by turning pair B to lever 7 which turns about fixed axis C. Pawls 2 and 3 are connected by turning pairs E and F to lever 7 and engage ratchet wheel 4 which rotates about fixed axis O. When piston 6 is reciprocated by the action of fluid delivered to the ends of cylinder 1, pawls 2 and 3 rotate ratchet wheel 4 clockwise. Spring 5 serves to keep the pawls in contact with the ratchet wheel.
$4030$THP,Dr$