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Publication numberUS1451484 A
Publication typeGrant
Publication dateApr 10, 1923
Filing dateMar 25, 1922
Priority dateMar 25, 1922
Publication numberUS 1451484 A, US 1451484A, US-A-1451484, US1451484 A, US1451484A
InventorsIrving C Woodward
Original AssigneeIrving C Woodward
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Screw thread
US 1451484 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

Apr. 10, 1923 is. WOODWARD SCREW THREAD Filed Mar. 25 1922 Patented Apr. 10. 1923 UNITED STATES IRVING C. WOODWARD, OF SYRACUSE NEW YORK.


Application filed March 25, 1922. Serial No. 548,65$.

To-all whomt'p, may canoewfi F I Be it known that I, IRVING C. VVooDwARD, a citizen of the United States of America, and a resident of Syracuse, county'of Onondaga, and State of New York, have invented a new and useful Improvement in Screw Threads, of which the following is a specification.

This invention relates to screw threads of the general class designed for the purpose of resisting accidental motioniof one of "a pair of coacting threaded members. Several different types of threads have been proposed for this purpose, but usually depart from the normal design to such an extent as to be impractical. It is the object of the' present invention to ing screw thread wit ture from the standard design.

lproduce a reliable locka minimum of deparplished by the thread as illustrated in the drawing, which shows a fragmentary view in section of a member provided with the imlproved thread..- riefly stated the invention consists in any one of-the standard forms of thread, for example, one having a sixty degree included angle, but with this angle decreased from normal near the apex of the thread. Thus the somewhat enlarged apex of the thread serves to produce the desired frictional resistance with a coacting thread. The coacting thread may be standard throughout. To cut this type of thread requires taps or dies only slightly altered from those which are employed for cutting the standard thread of the same size and pitch but without the enlarged apex.

The drawin shows the enlargement at the apex of the t read somewhat exaggerated. The dotted lines 1. represent the form of'the thread at its apex as it would appear if out The object of the invention is accom with the standard tools for this type of thread, that is, the angle is uniform from the base to the crest of the thread. In the prescut form of thread this angle of the sides 2 is uniform; from the base 3 to about two-thirds more or less of the distance between the base and the crest. The remainder of the thread near the crest has aless included an 1e. A nut havin this screw thread wil lock-tightly on a It having a standard thread, the enlarged crest of the tread wearing off sufficiently to allow the passage of the thread betweenthe threads of the bolt. Y

A. It may be seen from the foregoing that the thread is not weakened by the present improvement, but is in fact made slightly stronger by having more body, and that the 50 cutting tools required differ only slightly from normal taps and dies. The pitch of the thread is not affected by this improvement since it may remain normal throughout the threaded portion of the member in which the thread is cut.

I claim: 1. A member having a thread cut therein. ltJhe angle formed by the sides of the thread eing a point near the crest of the thread, from which point the angle decreases to the apex of the thread.

2. A member having a standard V, form of thread, but having an enlargement near the apex of thethread. i

3. A member'provided with a thread the included angle of \vhich'is less near the apex of the thread than throughout the main body portion thereof.

Signed at Syracuse, N. Y., this twentyfirst day of March, 1922.


uniform from the. base outwardly to 70-

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2484645 *Oct 23, 1946Oct 11, 1949Illinois Tool WorksScrew fastener
US2581690 *Nov 30, 1949Jan 8, 1952Moehle WalterLocking thread structure
US2787796 *Sep 30, 1952Apr 9, 1957Joseph RosanMethod of converting standard threads into locking threads
US3249141 *Jul 16, 1962May 3, 1966Neuschotz RobertDeformed locking thread with relieved areas
US3426820 *Oct 5, 1967Feb 11, 1969Res Eng & MfgHigh friction screw
US4527932 *Mar 3, 1983Jul 9, 1985Richard Bergner Gmbh & Co.Self-tapping screw
US4536117 *Jun 18, 1984Aug 20, 1985Mid-Continent Screw Products CompanyScrew fastener
US4576534 *Aug 4, 1983Mar 18, 1986Illinois Tool Works Inc.Thread form for soft material
US4810106 *Nov 30, 1987Mar 7, 1989Yazaki CorporationBearing structure
US4973209 *Mar 28, 1985Nov 27, 1990Conti Fasteners AgScrew for contaminated pre-tapped holes
US5738472 *Oct 17, 1996Apr 14, 1998Honeybee Robotics Inc.Modified locking thread form for fastener
US6863483 *Aug 19, 2003Mar 8, 2005Ejot Gmbh & Co. KbScrew provided with self-locking thread
US7334975May 5, 2003Feb 26, 2008Maclean-Fogg CompanyFastener assembly
US7410337Jun 1, 2006Aug 12, 2008The Maclean-Fogg CompanyFastener assembly
US7438512Nov 21, 2003Oct 21, 2008Maclean-Fogg CompanyU-bolt assembly
US7465135Nov 14, 2003Dec 16, 2008Maclean-Fogg CompanyU-Nut fastening assembly
US8011866Apr 19, 2007Sep 6, 2011Maclean-Fogg CompanyLocking fastener assembly
US8419779Dec 8, 2009Apr 16, 2013James A. RinnerSystematic displacement bone screw
DE3610392A1 *Mar 27, 1986Oct 16, 1986Conti Fasteners AgSchraube fuer verunreinigte gewindebohrungen
EP0207862A1 *Jun 30, 1986Jan 7, 1987LAURENT INDUSTRIE S.A. Société dite:Threaded bar like a screw and process for making the same
WO2013123940A2 *Jan 31, 2013Aug 29, 2013Ruia Global Fasteners AgSelf-tapping screw
U.S. Classification411/311, 411/938
Cooperative ClassificationY10S411/938, F16B39/30