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Manufacturers Index - Keystone Forge Co.
This page contains information on patents issued to this manufacturer.

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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
148,652 Mar. 17, 1874 Forges De Witt C. Baxter Philadelphia, PA
164,512 Jun. 15, 1875 Portable Forges De Witt Baxter Philadelphia, PA
167,311 Aug. 31, 1875 Improvement in Bench-Planes Leonard L. Davis Springfield, MA This plane was made by the maker of the well-known Davis levels and inclinometers. The patent is for a set of cutter adjustments for bench planes. One is for a "wedge", which is a metal piece that fastens to the bed just behind the mouth and provides support for the lower end of the cutter, and is adjustable to change the mouth opening. Another is a crosspiece which serves as the upper support for the cutter. This crosspiece is adjustable and provides a way to change the bed angle of the cutter. The crosspiece has set screws on both ends which provide a means for lateral adjustment of the cutter.

According to PTAMPIA Volume 2 by Roger Smith, Davis planes were built with two styles of frogs. The earliest models featured a scalloped shaped bridge between the side rails. A cutter locking screw is in the center of the bridge and features the screw adjustment feature illustrated in the patent drawings. Later models featured a simplified frog with two round head screws, as shown in picture #4. These planes originally had a Moulson Brothers or Butcher cutter and cap iron.