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US Patent: 712,537
Electric grinding device
Patentee:
Charles S. Hisey - Dayton, KY

USPTO Classifications:
125/11.01, 310/66, 310/91, 451/294, 451/363, 451/374, 451/415, 451/436, 82/137

Tool Categories:
specialty tools : handheld power tools
woodworking machines : handheld power tools

Assignees:
Hisey-Wolf Machine Co. - Cincinnati, OH

Manufacturer:
Hisey-Wolf Machine Co. - Cincinnati, OH

Witnesses:
C. Spengel
Arthur Kline

Patent Dates:
Applied: May 07, 1902
Granted: Nov. 04, 1902

Patent Pictures:
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"Vintage Machinery" entry for Hisey-Wolf Machine Co.
Description:
This "portable electrically driven grinding machine" could be hand-held but it was primarily intended for use as an attachment to lathes, planers, milling, machines, etc., for grinding operations. The direct-drive DC motor revolved at about 4500 RPM according to the March 1903 American Engineer and Railroad Journal.

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