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US Patent: 120,266
Improvement in Dies for Cutting Screw Threads
John J. Grant - Greenfield, Franklin County, MA

USPTO Classifications:
408/162, 408/182

Tool Categories:
wrenches : tap wrenches and die stocks


Wiley & Russell Mfg. Co. - Greenfield, MA

Henry T. Brown
Fred. Haynes
J. W. Coombs

Patent Dates:
Granted: Oct. 24, 1871

Patent Pictures:
John J. Grant patent October 24, 1871
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Wiley & Russell Mfg. Co. (vintagemachinery.org)
Brown, Coombs & Co. - patent attorneys

This invention consists in the arrangement within the die-stock or holder, and between the dies, of taper or taper-headed adjusting-screws for setting out the dies, such screws operating, in combination with external set-screws, to obtain a perfect and secure adjustment of the dies.

This patent was the basis for the adjustable dies produced by Wiley & Russell. Patent nos. 303,060 and 306,723 are subsequent improvements.

Corresponding Canadian patent no. CA-1,765 was issued November 12, 1872 to J.J. Grant, Solon L. Wiley and Charles P. Russell of Greenfield, Mass.

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