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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2,305,128
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Dec. 15, 1942
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Variable speed feed mechanism
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Willard E. Gerbing |
Chicago, IL |
Of interest primarily because co-inventor Willard Gerbing went on to establish Gerbing Mfg. Co., makers of a variable-speed drive mechanism. This particular variable-speed mechanism was intended for feeding material into a mill for grinding. |
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Variable speed feed mechanism
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Lorenz J. Andresen |
Chicago, IL |
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2,475,954
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Jul. 12, 1949
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Variable speed pulley
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Willard E. Gerbing |
Chicago, IL |
This variable-diameter pulley keeps a constant center-line regardless of diameter, and purports to have an exceptionally wide range of diameters. |
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2,475,955
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Jul. 12, 1949
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Variable pitch pulley
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Willard E. Gerbing |
Chicago, IL |
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2,602,342
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Jul. 08, 1952
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Variable speed drive
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George A. Kohout |
Chicago, IL |
This variable-diameter pulley mechanism constitutes an improvement to patent 2,475,954, used by Gerbing Mfg. Co. for their Roto-Cone variable-drive system. It is not known if this present invention was used by Gerbing or by anyone else. |
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2,714,313
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Aug. 02, 1955
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Variable pitch pulley
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Willard E. Gerbing |
Park Ridge, IL |
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3,150,527
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Sep. 29, 1964
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Variable speed device and adjusting means therefor
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George L. Trandel |
Elgin, IL |
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