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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20,192
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May. 11, 1858
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Method of seating the movable cutter in expansive bits
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William A. Clark |
Bethany, CT |
The invention is an expansion auger bit where the movable cutter is held in place by a beveled key. The patent was extended and was manufactured for about a century, being widely copied once the extended patent expired in 1879. The expansion bits were manufactured by the inventor's son, Frank Emerson Clark, as W. A. Clark & Company. Frank became a partner in R. H. Brown & Co., and by 1903 that firm was the stated successor to W. A. Clark & Co. and was making this patent expansion bit, marked as "Brown-Clark". The bits were also made by Connecticut Valley Mfg. Co., a.k.a. Convalco, and we have seen such bits marked with the patent date which implies that they were licensed during the term of the patent. This style of expansion bit was made as late as the 1950s by Robert H. Clark Co., of Beverly Hills, CA; since the patent was long expired by then we do not list them as a manufacturer on the patent.
A correspondent reports an example, with "Wm A Clark—Cast Steel Pat May 11 1858 Pat Ext'd" stamped on it. Another example was made by Connecticut Valley Mfg. Company, Centerbrook, Connecticut. |
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226,246
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Apr. 06, 1880
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Lathe-chuck
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Charles H. Reid |
Danbury, CT |
An 1891 from R. H. Brown & Co. features "Reid drill chucks", in three sizes. "They are the strongest and most durable made. Drill absolutely in the center. No twisting or bending necessary if the drill is straight. Can be fitted to hollow spindle lathes for working long rods." |
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279,017
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Jun. 05, 1883
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Lathe-chuck
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Charles H. Reid |
Danbury, CT |
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