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US Patent: 181,648
Improvement in Securing Saw-Handles to Blades
Henry Disston - Philadelphia, PA

USPTO Classifications:

Tool Categories:
woodworking tools : handsaws : saw nuts


Henry Disston & Sons - Philadelphia, PA

Harry Smith
Harry Howson, Jr.

Patent Dates:
Applied: Jan. 21, 1876
Granted: Aug. 29, 1876

Patent Pictures:
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The heads of the saw screw and nut are slightly domed, and their outer edges beveled so that they flare outward toward the face. Additionally, the screw is received by a blind threaded socket in the tubular projection of the nut. The tubular projection may, or may not, be long enough to engage the saw blade. Disston expresses a preference for those which are long enough to engage the blade. The overall purpose of this patent is to allow the handle and the saw nuts and screws to be finished and polished prior to assembly, with the beveled edges of the bolts/screws forming their own seats in slightly undersized shallow holes bored into the handle. This also allows for the saw nut to be subsequently tightened without altering appearances.

Saw nuts based on this patent were cast, making them relatively expensive to produce. Additionally, the shafts were relatively thin, so were prone to twisting off. In time, they appear to have been superceded by Glover's patent (375350).

Figures 4 & 5 of the patent drawing were added to illustrate the common "split nut" arrangement which Disston intended to replace.

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