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
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More information on how to configure your computer to view these patents can be
found at TIFF image Viewers
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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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2,893,253
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Jul. 07, 1959
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Variable pitch pulley mechanism
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Paul K. Beemer |
Laguna Beach, CA |
This continuously variable-speed drive-belt mechanism was subsequently improved in patent 3,154,959, which was assigned to Electra Motors, Inc., of Anaheim. This patent, which was assigned to hydraulic press manufacturer Preco Inc., is intended to address the problem that in these Reeves-type continuously-variable-speed pulley systems, the mechanism was prone to sticking if it was run for a long time at a constant speed. Patents 2,256,699 (assigned to General Motors) and 2,711,103 (reissued as 24,347, which was assigned to Miner Pulley & Transmission Co. of Denver) are mentioned as earlier attempts to address this problem. |