Rack 2 is driven directly from handwheel 1, rigidly attached to shaft 5, through pinion 4 which is keyed to the shaft. Rack 3 is driven from handwheel 1 through gear 6, rotating freely on shaft 5 and rigidly attached to collar 8, and the consecutive engagement of pins a, c and b in handwheel 1, freely rotating disk 7 and collar 8. Thus, at the beginning of each stroke of rack 2, rack 3 has a dwell or delay corresponding to two revolutions of handwheel 1 minus the thickness of two pins. Only after this will pins a, c and b come into contact, so that gear 6 begins to rotate and rack 3 starts on its stroke. On the return stroke of rack 2, rack 3 has a similar dwell.
$2942$CxG,ML$