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US Patent: 181,422
Improvement in Handsaws
Patentees:
Henry Disston - Philadelphia, PA
Charles T. Shoemaker - Philadelphia, PA

USPTO Classifications:
30/525

Tool Categories:
woodworking tools : handsaws : backsaws
woodworking tools : handsaws : saw handles

Assignees:
Henry Disston - Philadelphia, PA
Hamilton Disston - Philadelphia, PA
Albert H. Disston - Philadelphia, PA

Manufacturer:
Henry Disston & Sons - Philadelphia, PA

Witnesses:
A. H. Shoemaker
Geo. S. Grady

Patent Dates:
Applied: Apr. 29, 1876
Granted: Aug. 22, 1876

Patent Pictures:
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"Vintage Machinery" entry for Henry Disston & Sons
Description:
A hole thru the blade facilitates a screw/bolt to secure the blade to the back of a backsaw as either a "U" shaped clamp or as part of the frame. Would prevent the blade from working its way out of the metal back as is sometimes encountered with backsaws.

Known example with closed handle but apparently a short lived design.

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