Ratchet wheel 1 rotates about fixed axis A. Lever 2 turns about fixed axis B and is connected by turning pairs C and D to pawls 4 and 3. When lever 2 is oscillated about axis B, pawls 3 and 4 alternately engage the teeth of ratchet wheel 1 turning the wheel intermittently counterclockwise. Pawls 3 and 4 also serve as locks preventing reverse rotation of wheel 1 . In one complete oscillation of lever 2 (back and forth), ratchet wheel 1 turns through the angle α=360°/z, where z is the number of teeth on ratchet wheel 1.
$1795$LR,4L$