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US Patent: 39,782
Grinding Files
Improved Machine for Grinding Half Round Files
Patentees:
James A. Stafford - Boston, MA
Timothy Smith - Charlestown, MA

USPTO Classifications:
451/237, 451/28

Tool Categories:
industrial tools : files
metalworking machines : grinders : tool grinders
metalworking tools : files

Assignees:
Whipple File Mfg. Co. - Charlestown, MA

Manufacturer:
Not known to have been produced

Witnesses:
N. W. Stearns
P. E. Teschenmacher

Patent Dates:
Granted: Sep. 01, 1863

Patent Pictures:
USPTO pdf tiff
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Description:
The file-blanks are rolled or forged with a curved surface of about one hundred and twenty degrees, or one-third of a circle. They are then secured to a mandrel, o, having three sides. The blanks y are then secured upon the mandrel (as seen in Fig. 1) by the following means: The smaller ends of the blanks y having been cut off, so as to give them a chamfer, this chamfer is entered beneath the edge of a stationary ferrule, r, upon the end of the mandrel, and a small block, a2, is placed upon the tang of each blank. A ring, b2, or short confining-cylinder is then slipped over the blocks, and is caused to pass them down upon the tangs by means of a nut,j2, which works upon a screw on the mandrel, and thus the blanks are held immovable thereon.

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