Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS327296 A
Publication typeGrant
Publication dateSep 29, 1885
Filing dateJul 13, 1885
Publication numberUS 327296 A, US 327296A, US-A-327296, US327296 A, US327296A
InventorsWilliam T. Mcginnis
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
William t
US 327296 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

(No Model.) I



No. 327,296. Patented Sept. 29', 1885.

n, warns. Wm, Wm. 11 c toward the point.




SPECIFICATION forming part of Letters Patent No. 327,296, dated September 29, 1885.

Application filed July 13, 1885. (No model.)

2'0 (6 whom, it may concern.-

Be it known that I, WILLIAM T. McGIN- NIs, of the city, count-y, and State of New York, have invented a new and useful Improvement in Screw-Nails; and I do hereby declare that the following is a full and eX- act description thereof, reference being bad to the accompanying drawings, and to the letters of reference marked thereon, making a.

more spiral threads along the length of the nail with an increasing pitch from end to end, so that the proximate turns of the thread shall be closer at one end of the nail than at the other.

In the accompanying drawings, Figure 1 represents, both in elevation and in longitudinal central section, my improved screwnail having the threads produced thereon by means of spiral grooves formed in the tapering body of the nail, and with a pitch gradually decreasing toward the point. Fig. 2 represents in elevation and section the same description of screw-nail having the pitch of its threads increasing toward the point; Fig. 3 is a transverse section in line 00 w of Fig. 1. Figs. 4

and 5 illustrate, respectively, each by an ele-.

v ation and longitudinal section,a modification of my invention, in which the threads are produced in the form of ribs projecting from the tapering body or stem of the nail, the pitch of the threads in Fig. 4 being shown as decreasing, and that in Fig. 5 as increasing, Fig.6 is a cross'section in line y y of'Fig. 4..

A represents the body or stem of my improved screw nail, tapering in form and nicked at its larger end, as shown at b, said end being usually,but not necessarily, formed with a conical enlargement, constituting a head, 0, such as is ordinarily found in wood-screws, although I prefer to make this head longer and more tapering than the head generally found upon wood-screws. The body or stem A of the screw-nail is exteriorly threaded by means of one or more spiral grooves, D D, produced along its length with a pitch which is gradually changed from end to end of the body, so that the interval between the proximate threads shall be much closer next to the head than at the point, (see Fig. 1,) or vice versa, as shown in Fig. '2. angle of the spiral ridge between the proximate grooves with the body of the nail remains uniform, and is made at a very obtuse angle-say ninety degrees or moreso that the nail may be readily driven into a piece of wood without undue frictionand withouttearing its fibers.

As an equivalent for the threads of varying pitch produced by channeling or grooving the stem or body of the nail, I contemplate form ing spiral ridges or threads E E in relief, each as a distinct projection from the body, whose tapering form is preserved as a central core, A, in manner substantially as shown in Figs. 4, 5, and 6.

In either case the screw-nails maybe manufactured by stamping metal blanks between suitable dies in a drop or other form of press, or by chasing the same in a lathe adjusted to produce a thread of varying pit-ch.

My screw-nail differs from an ordinary woodscrew,not only in the increased angle of its spiral thread, but more especially in the grad'uallyvarying pitch thereof, the pitch being made to increase from head to point, or vice versa. The result of this gradual approximation of the threads is to produce, as the nail is driven, a gradual compression of the fibers embraced between the threads, serving to bind and hold the driven nail very firmly, without, however, preventing its withdrawal by a rotation thereof through the instrumentality of a screw-driver or equivalent device applied to its head or outer end.

I claim as my invention- A screw-nail constructed with a tapering body encircled by spiral threads produced thereon with a pitch varying constantly from one end thereof to the other, substantially in the manner and for the purpose herein set forth.

scribing witnesses.


' Witnesses:

J. F. AOKER, Jr., A. B. MOORE.

In either case the

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2714831 *Jan 23, 1952Aug 9, 1955Graham Tie Dowel Service CompaThreaded locking dowel
US5375957 *Sep 28, 1993Dec 27, 1994John Lysaght (Australia) LimitedImpact drivable fastener
US7520710 *Aug 15, 2005Apr 21, 2009Hilti AktiengesellschaftFastening element
US8070786Jan 9, 2006Dec 6, 2011Acumed LlcSystem for fusing joints
US8092505 *Jan 28, 2009Jan 10, 2012Acumed LlcBone nail
US9161793Mar 27, 2013Oct 20, 2015Acumed LlcAxial tension screw
US9291183Feb 25, 2014Mar 22, 2016W. C. LitzingerMushroom-compaction and asymmetric-thread impact-drivable screw
US9308034 *Jun 28, 2013Apr 12, 2016DePuy Synthes Products, Inc.Bone plate
US20060041226 *Aug 15, 2005Feb 23, 2006Hilti AktiengesellschaftFastening element
US20060229622 *Jan 9, 2006Oct 12, 2006Huebner Randall JSystem for fusing joints
US20070258794 *Mar 20, 2007Nov 8, 2007Litzinger W CMushroom-compaction and asymmetric-thread impact-drivable screw
US20090192512 *Jan 28, 2009Jul 30, 2009Sommers Mark BBone nail
US20130296943 *Jun 28, 2013Nov 7, 2013Mark P. Grady, Jr.Bone plate
Cooperative ClassificationF16B15/06