Lever 1 turns about fixed axis A and is connected by turning pairs C and B to pawls 2 and 3. Ratchet-tooth rack 4 is moved intermittently in a straight line in guides a-a by pawls 2 and 3 which alternately engage the rack when lever 1 oscillates about axis A. Pawls 2 and 3 also serve as locks preventing reverse motion of rack 4.
$1801$LR,4L$