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US Patent: 375,350
Saw Screw
Glover's Saw Screw
Charles Glover - Hartford, CT

USPTO Classifications:
30/330, 411/166, 411/338, 411/378

Tool Categories:
woodworking tools : handsaws : saw nuts


Henry Disston & Sons - Philadelphia, PA
E. C. Atkins & Co. - Indianapolis, IN
Simonds Manufacturing Co. - Fitchburg, MA

Chas. L. Burdett
E. P. Pelton

Patent Dates:
Applied: Aug. 02, 1886
Granted: Dec. 27, 1887

Patent Pictures: [ 1 | 2 ]
USPTO pdf tiff
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The primary focus of this patent is on the two-part construction of the saw medallion ("label screw"). In a sense, it can be seen as an improvement on Munger's patent (U.S.P.N 98180), which had no provision for preventing the shaft from twisting independent of the head if the swaged fit failed. The large show surface of Glover's medallion, in conjunction with the shoulder beneath it, allowed for the addition of longitudinal ribs on the shaft of the screw to resist turning.

The medallion (figures 2, 3 & 4) and the saw screw (figure 5) shown in Glover's patent drawings both feature the internally threaded construction patented by Henry Disston in 1876 (U.S.P.N. 181648). This form displaces the through screw and "split nut" arrangement which had been the norm. Glover's saw screw differs from Disston's by being formed in a die rather than being cast and having longitudinal ribs on the shaft rather than a square section to resist turning. Also, though not specified in the patent, the shafts of Glover's saw nuts were of stouter construction. Glover's form eventually superceded Disston's.

Saw medallions with this patent date have been found on saws from a wide variety of saw manufacturers.

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