US Patent: 157,296 - Improvement in Flattening and Tempering Saws


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US Patent: 157,296

Improvement in Flattening and Tempering Saws

Patentee:

Christopher Richardson (exact or similar names) - Newark, NJ

USPTO Classifications:

432/225

Tool Categories:

woodworking tools : handsaws

woodworking machines : specialty woodworking machines : tool making machines

Assignees:

None

Manufacturer:

Richardson Bros. - Newark, NJ

Witnesses:

Thos. S. Crane

John P. Brooks

Patent Dates:
Applied:	Sep. 14, 1874
Granted:	Dec. 01, 1874

Patent Pictures:

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Description:

Saws are flattened before hardening. They are placed in the oven until "quite hot"; transferred to clamping plates; pressed in a softened condition; and reheated if needed and then hardened in a bath of oil. Hammering is still required after hardening but it is claimed to be reduced by 2/3s and the amount of grinding required reduced by 1/3. Process appears to be an improvement of his earlier patent 65,946.

Assumed to be utilized by Richardson Bros in their saw making operations.