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US Patent: 42,217
Improvement in File Cutting Machines
Patentee:
William T. Nicholson - Providence, RI

USPTO Classifications:
76/20

Tool Categories:
woodworking machines : specialty machines : tool making machines
metalworking tools : files

Assignees:
None

Manufacturer:
Nicholson File Co. - Providence, RI

Witnesses:
Benj. F. Thurston
Byron Sprague

Patent Dates:
Applied: Feb. 20, 1864
Granted: Apr. 05, 1864

Patent Pictures:
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Description:
A rocking bed designed to move during the cutting of teeth. When there is any unevenness of the surface that would cause the chisel to cut deeper on one side than the other, the blow of the chisel causes the worm gear to turn and move the blank to ensure even teeth. Text references that this is an improvement of a portion of a file machine which he had applied for at the same time, Patent No. 42,216. Files produced by this machine are covered later under his Patent Nos. 44,443 and 58,025.

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