https://www.datamp.org/ Recently added patents en-us https://www.datamp.org/patents/displayPatent.php?id=83117&pn=412,215 Machine for Cutting Special Pinions Patentees: Edward P. Walter - Bridgeport, Fairfield County CT , Henry C. Walter - Bridgeport, Fairfield County CT Granted:1889-10-01

Abstract: Our invention relates to certain new and useful improvements in machines for cutting spiral pinions or for producing any description or pitch of thread upon shafts or other work of cylindric form, and has for its object to provide mechanism partly rotary and in part reciprocatory, whereby the cutting of said threads may be economically and rapidly accomplished; and with these ends in view our invention consists in the details of construction and combination of elements. Claim: he combination, with the bed, the turn-table, the carriage mounted thereon, the chuck arranged upon the carriage, and means, as described, whereby forward motion may be imparted to the carriage and both forward and rotary motion to the chuck, of the cutting-tool and carriage mounted above the work carriage and adapted to be reciprocated.
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