US Patent: 497,095 - Drill-grinder


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US Patent: 497,095

Drill-grinder

Patentee:

Thomas Hall (exact or similar names) - New York, NY

USPTO Classifications:

451/375

Tool Categories:

metalworking machines : grinders : drill grinders

metalworking machines : grinders : sharpening machines : drill sharpening machines

Assignees:

None

Manufacturer:

Thomas Hall - New York, NY

Witnesses:

A. M. Pierce

Isabel Chester

Patent Dates:
Applied:	Jan. 09, 1892
Granted:	May 09, 1893

Patent Pictures:

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Vintage Machinery entry for Thomas Hall

Description:

This was the "Ideal" twist-drill grinder that was manufactured by the inventor, a New York City machinist. The inventor is better known as having patented and manufactured one of the earliest typewriters.

The improvement is to the bit-holder that references the groove associated with the cutting edge to be sharpened and orients the bit correctly as the bit advances toward the grinding wheel.