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US Patent: 62,977
Screw Threading Machine
Improvement in Lathes for Chasing and Backing Down Taps
Patentee:
W. X. Stevens - Worcester, MA

USPTO Classifications:
82/19

Tool Categories:
metalworking machines : metal lathes : screwcutting lathes

Assignees:
J. M. King - Waterford, NY
D. B. King - Waterford, NY

Manufacturer:
Not known to have been produced

Witnesses:
Thomas Breslin
P. Quackenbush
J. W. Coombs
G. W. Reed

Patent Dates:
Granted: Mar. 19, 1867

Patent Pictures:
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Description:
Brown, Coombs & Co. - patent attorneys

In this my improvement I employ many parts or details which are common to other lathes for doing similar work, such as the revolving mandrel and driver to the tap blank, which is held by the usual centres at opposite ends horizontally, sliding and raising and lowering tool-stock, and guide-bar, used for making the tool follow the taper or profile of the tap. These parts, therefore, will only be generally referred to in the following description of my invention, the nature of which consists in, firstly, giving to the tool its "backing-down" motion through the guide-bar previously mentioned, and which device is accordingly made to accomplish two functions instead of one, and to secure the proper relative performance of both.. Also, my invention further consists in raising the end of the tool-stock by means of a pattern on the mandrel, which forms a simple and effective device for the purpose. Likewise, my invention consists in a novel combination of pattern on the mandrel lever, with its lifter or lifters set in motion by the pattern, bar operated by the lifters, and tool-stock raised at its end by the motion of the bar, the whole or such several parts operating as an entirety to effect the "backing down" action required in an easy and practicable manner.

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