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Manufacturers Index - National Machine Tool Co. (Cincinnati)

National Machine Tool Co. (Cincinnati)
Cincinnati, OH, U.S.A.
Company Website: http://www.keyseaters.com/
Manufacturer Class: Metal Working Machinery

This page contains information on patents issued to this manufacturer.

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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.

Patent Number Date Title Name City Description
667,406 Feb. 05, 1901 Variable Speed Gearing William L. Schellenbach Cincinnati, OH Wood, Boyd & Wood - patent attorneys
683,003 Sep. 17, 1901 Variable-speed mechanism William L. Schellenbach Cincinnati, OH
74,997 Mar. 04, 1902 Variable speed mechanism William Lorraine Schellenbach Cincinnati, OH This is the Canadian equivalent of US patent 683,003, which was explicitly assigned to National Machine Tool Co. of Cincinnati.
725,779 Apr. 21, 1903 Screw mechanism William L. Schellenbach Cincinnati, OH "...in an ordinary engine-lathe the accuracy of the screws produced depends upon the original and maintained accuracy of the lead-screw of the lathe. If the lead-screw be employed also for general feeding purposes, then its accuracy becomes very much impaired by wear..." This invention proposes serving these two conflicting functions of the lead-screw by using a single lead-screw with a double thread: one thread for general feeding and one for screw-cutting.
795,420 Jul. 25, 1905 Key-seating tool William L. Schellenbach Cincinnati, OH