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

USPTO Classifications:

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

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

Henry Disston & Sons - Philadelphia, PA

A. H. Shoemaker
Geo. S. Grady

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

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for Henry Disston & Sons
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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