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US Patent: 59,950
Improved Machine for Sharpening Saws
Patentee:
John Borthwick - Philadelphia, PA

USPTO Classifications:
451/279, 451/293, 76/37, 76/45

Tool Categories:
woodworking machines : circular saws : annular saws

Assignees:
None

Manufacturer:
Henry Disston & Sons - Philadelphia, PA

Witnesses:
C. D. Colladay
R. M. Hartley

Patent Dates:
Granted: Nov. 27, 1866

Patent Pictures:
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"Vintage Machinery" entry for Henry Disston & Sons
Description:
Utilizes an emery rim or ring instead of a solid emery wheel or file in conjunction with a flange and plate to hold the saw.

Several reference to the ease of use and the ability of children to operate the device.

Available according the 1876 Disston catalog.

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