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US Patent: 400,660
Machine for grinding Shimer-molding bits, &c.
Hiram C. Gilbert - Burlington, VT

USPTO Classifications:
451/246, 451/374

Tool Categories:
metalworking machines : grinders : sharpening machines : cutterhead sharpening machines


Not known to have been produced

Charles E. Allen
Harmon S. Graves

Patent Dates:
Applied: Jul. 05, 1888
Granted: Apr. 02, 1889

Patent Pictures:
USPTO pdf tiff
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"My invention relates to an improvement in sharpening-machines which are intended more especially for sharpening circular bits of matcher-heads; and it consists in the combination of a revolving emery-wheel, which is mounted in vertical adjustable bearings, an arbor upon which the matcher-head is placed to be sharpened, a frame through which the mandrel passes, a revolving block by which the mandrel is adjusted vertically, a handle for horizontally revolving the adjusting-block, and a carriage by means of which the head is moved back and forth in relation to the emery-wheel..."

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