US Patent: 39,782 - Improved Machine for Grinding Half Round Files


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US Patent: 39,782

Grinding Files
Improved Machine for Grinding Half Round Files

Patentees:

James A. Stafford (exact or similar names) - Boston, MA

Timothy Smith (exact or similar names) - 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:

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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.