Lever 1 turns about fixed axis A and is connected by turning pairs C and B to pawls 3 and 4. Ratchet-tooth rack 2 is moved intermittently in a straight line in guides a-a by pawls 3 and 4 which alternately engage the rack when lever 1 is oscillated about axis A. Pawls 3 and 4 also serve as locks preventing reverse motion of rack 2.
$1802$LR,4L$