US Patent: 67,734 - Improvement in Hardening and Straightening Steel Blades


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US Patent: 67,734

Improvement in Hardening and Straightening Steel 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:

Henry Disston & Son - Philadelphia, PA

Witnesses:

John White

W. J. R. Delany

Patent Dates:
Granted:	Aug. 13, 1867

Patent Pictures:

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"Vintage Machinery" entry for Henry Disston & Sons

Description:

Simulataneous hardening and straightening blades of steel using gradual pressure between plates and dipping the blades into the hardening composition while the blades are in a heated state. Disston subsequently applied for a different patent, 86286, since while this method worked well for handsaw blades and thin strips of metal, it did not allow larger circular saw blades to be adequately coated with the hardening composition.