Manufacturers Index - National Broach & Machine Co.
National Broach & Machine Co.
Detroit, MI, U.S.A.
Manufacturer Class:
Metal Working Machinery
This page contains information on patents issued to this manufacturer.
Submitting Patent Information
If you find a patent number or patent date by this manufacturer that is not on this
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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
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More information on how to configure your computer to view these patents can be
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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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1,989,651
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Jan. 29, 1935
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Method of finishing gears
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Robert S. Drummond |
Detroit, MI |
This patent number was seen in a brochure from National Broach & Machine Co., Inc., of Detroit.
The usual process of finishing gears involves rotating a pair of matching gears with abrasive paste on the mating surfaces, a process that causes uneven material removal as the amount of relative motion is proportional to the distance from the pitch circle. The modified process uses a special cast-iron mating lap that moves transversely to the usual direction of motion of the gear teeth. |
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1,989,652
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Jan. 29, 1935
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Method for finishing internal gears
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Robert S. Drummond |
Detroit, MI |
This patent number was seen in a brochure from National Broach & Machine Co., Inc., of Detroit, and the patent is a companion to patent 1,989,651. See that patent for more information. |
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2,111,045
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Mar. 15, 1938
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Lapping machine
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Robert S. Drummond |
Detroit, MI |
This patent number was seen in a brochure from National Broach & Machine Co., Inc., of Detroit, and constitutes an improvement to the inventor's patent 1,989,651. See that patent for more information; the present patent adds a crowning effect to slight round the ends of the teeth. |
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2,273,399
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Feb. 17, 1942
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Machine tool
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Charles B. De Vlieg |
Detroit, MI |
The invention is a "milling machine adapted to rotate a work piece and present the same to one or more milling cutters to machine the work piece to a circular cross section." |
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2,292,647
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Aug. 11, 1942
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Cutter Holder
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Max B. Mentley |
Detroit, Wayne County, MI |
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2,906,177
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Sep. 29, 1959
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Gear Finishing
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Thomas S. Gates |
Grosse Pointe Woods, MI |
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Gear Finishing
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Robert M. Williams |
East Detroit, MI |
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