Slider 1 moves along fixed plane d-d. Link 2 is connected by turning pair A to slider 1 and by turning pairs C and D to pawls 3 and 4 which engage ratchet wheels 5 and 6. Wheels 5 and 6 are rigidly attached to meshing gears 7 and 8 which rotate about fixed axes E and F. When slider 1 reciprocates, lever 2, at the end of each stroke, runs against lug a or b so that it alternately turns from side to side, bringing either pawl 4 or 3 into engagement with ratchet wheel 6 or 5. This turns gears 7 and 8 with periodic dwells.
$1835$LR,D$