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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3,432,934
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Mar. 18, 1969
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Sine plate assembly
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Hermann Schmidt |
East Hartford, CT |
"A primary object of this invention is to provide an improve sine plate particularly suited for quick and easy manufacture and assemble and which will provide long reliable service..." |
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5,266,914
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Nov. 30, 1993
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Magnetic chuck assembly
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Robert Michael Dickson |
Coventry, CT |
Hermann Schmidt's magnetic chuck uses two horizontal plates separated by a layer of non-magnetizable material. Each plate consists of two sections of magnetizable material separated by a strip of non-magnetizable material. There is a large circular opening in that material to hold a disc containing a series of permanent magnets, and the magnets within each half of the disc all have the same polarity as each other, but opposite to those in the other half of the disc. The disc can be rotated 90 degrees. In one position all of the magnets of like polarity are between a single section of the upper plate and a single section of the lower plate, and in such position the magnetic chuck is active and holds the workpiece in position. In the other position half of the magnets of like polarity are between each section of the upper plate and each section of the lower plate, and in such position the magnetic chuck is inactive and the workpiece is released. |
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Magnetic chuck assembly
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Hermann Schmidt |
East Hartford, CT |
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6,997,656
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Feb. 14, 2006
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Device and assembly for holding an object
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Richard C. Bengston |
Columbia, NH |
This ingenious device holds round objects concentrically. It allows a relatively wide range of diameter and is capable of great precision. It can also be used for tool holding. |
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Device and assembly for holding an object
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Robert Michael Dickson |
Coventry, CT |
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Device and assembly for holding an object
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Peter Schmidt |
Bolton, CT |
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