If you find a patent number or patent date by this manufacturer that is not on this
list, please contact the Site Historian.
Key to Links for Patent Information
USPTO = U.S. Patent Office .
Images of the actual patent can be viewed on the U.S. Patent Office web site but
a special TIFF viewer must be installed with your browser in order properly work.
More information on how to configure your computer to view these patents can be
found at TIFF image Viewers
for Patent Images.
DATAMP = Directory of American Tool And
Machinery Patents . A sister site to VintageMachinery.org with information
on patents related to machinery and tools. A much easier user interface than the
USPTO's for finding information on machinery patents.
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12,423
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Feb. 20, 1855
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Slide Rest for Lathes
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William Stephens |
Richmond, Wayne County, IN |
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16,811
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Mar. 10, 1857
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Watchmakers' Lathe
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William Stephens |
Richmond, Wayne Co, IN |
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734,329
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Jul. 21, 1903
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Adjustable Wrench
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Elisha F. Hirst |
Richmond, IN |
The interior spring creates side pressure to prevent the sliding jaw from moving freely. The rotating toothed spiral cam (which sets in a central slot in the shank) provides a stop to adjust the size of the jaw opening.
Although a cam-adjust nut wrench may seem unusual, a similar shaped cam independently conceived by a British inventor resulted in the BURSTON CAM SPANNER, based on British 1932 patent 384,468 -- also patented in the U.S. in 1936 - [2,053,033]. |