US Patent: 86,286 - Improvement in Device for Simultaneously Hardening and Straightening Circular-Saw Blades


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US Patent: 86,286

Improvement in Device for Simultaneously Hardening and Straightening Circular-Saw Blades

Patentee:

Henry Disston (exact or similar names) - Philadelphia, PA

USPTO Classifications:

148/588, 148/645, 148/647, 76/112

Tool Categories:

woodworking machines : specialty woodworking machines : tool making machines

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

A. H. Shoemaker

William A. Steel

Patent Dates:
Granted:	Jan. 26, 1869

Patent Pictures:

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Description:

Patent overcomes the shortcomings of Disston's earlier utility patent, 67734, which worked well for narrow saw blades and thin strips of steel but not for circular saw blades. The blade is put in a frame consisting of rods which allows the hardening composition to cover the entire surface.