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DUPLEX RACK-AND-PINION GEARING WITH A RATCHET WHEEL

Pinions 1 and 2 rotate about fixed axis A. Link 3 reciprocates along axis B-B in fixed guides a-a. Pinions 1 and 2 rotate freely on shaft 7 and ratchet wheel 4 is keyed on shaft 7 between pinions 1 and 2. On their inside faces, pinions 1 and 2 carry freely pivoted pawls 6 and 5 which engage ratchet wheel 4. The pawls are located so that in the reciprocation of link 3 whose rack teeth b rotate piniā€¦