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US Patent: 70,479
Grinding Metal
Improvement in Metal Planers
Patentee:
James Hervey Sternbergh - Reading, PA

USPTO Classifications:
451/213, 451/363, 451/411

Tool Categories:
metalworking machines : grinders : surface grinders
metalworking machines : metal planers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Jacob Snell
Thomas Darlington, Jr.

Patent Dates:
Granted: Nov. 05, 1867

Patent Pictures:
USPTO pdf tiff
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Description:
The machine is intended for planing or grinding off metal surfaces with rapidity and with great accuracy, and more particularly for planing off smoothly and perfectly true any hardened surfaces which cannot be cut with a steel tool on the ordinary planer now in common use such, for instance, as chilled iron, hardened steel, anvil-faces, plane-irons, saw blades, glass or stone surfaces, or other hard substances.

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