|Publication number||US146023 A|
|Publication date||Dec 30, 1873|
|Filing date||Aug 7, 1873|
|Publication number||US 146023 A, US 146023A, US-A-146023, US146023 A, US146023A|
|Inventors||Isaac S. Eussell|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (28), Classifications (1) |
|External Links: USPTO, USPTO Assignment, Espacenet|
Improvement in wood-screws
US 146023 A
Wood-Screws. No.v 146,023. Y Patented oms-o, ma.
UNITED STATES PATENT OEEIoE` ISAAo S. RUSSELL, 0E NEW MARKET, MARYLAND, ASSIeNoR oE ONE-HALE EIS RIGHT To HENRY R. RUSSELL7 0E wooDRURY, NEW JERSEY.
IMPROVEMENT IN WOOD-SCREWS.
Specification forming part of Letters Patent No. 146,023, dated December 30, 1873; application filed August 7, 1873.
To all whom it may concern Be it known that I, ISAAC S. RUSSELL, of
` New Market, Frederick countv, Maryland, have passes; and to effect thiS, I give to the thread a varying pitch, decreasing gradually from the point throughout the Whole of its length,
A as is clearly represented by the accompanying drawing.
It is obvious that if a portion only of the threads have the gradually-decreasing pitch described, the eiiect of those threads would be the same-di'ering only in degree-as if all were of varying pitch; but
What I clailn as my invention, and to Secure by Letters Patent, is
A wood-screw, with a thread of varying pitch, gradually decreasing from` the point throughout the whole of its lengt-h, as Shown and described.
desire ISAAC S. RUSSELL.
Witnesses JOEL HALL, KATE HALL.
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|US20110280683 *||Jan 19, 2010||Nov 17, 2011||Joachim Galipaud||Screw or nut with a thread a pitch of which varies and tool to produce said screw or nut|
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