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Publication numberUS1294268 A
Publication typeGrant
Publication dateFeb 11, 1919
Filing dateAug 26, 1915
Priority dateAug 26, 1915
Publication numberUS 1294268 A, US 1294268A, US-A-1294268, US1294268 A, US1294268A
InventorsEdward C Holmes
Original AssigneeEdward C Holmes
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Screw-spike.
US 1294268 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

E. C. HOLMES.

SCREW SPIKE.

APPLICATION FILED Aue.2fi. 191s.

L fiwo Patented Feb.11,1919.

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new c. Romans, or nonwoon, OHIO.

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Specification of Letters Patent.

Patented Feb. 11, 1919.,

Application filed August 26, 1915. Serial a... 47,407.

To. all whom it may concern:

Be it known that I, EDWARD O. HoLMns, a citizen of the United States, and a resident of the city of Norwood, in the county of- Hamilton and State of Ohio, have invented certain new and useful Improvements in Screw-Spikes, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to screw spikes especially adapted for securing rails to the sleepers in railway track construction and for other construction work, and the object of the invention is to provide a screw spike that may be screwed to place without any preliminary boring of a hole for its reception even in the hardest and toughest of woods, and which can be screwed to its seat with a simple hand wrench.

Spikes for railway track construction must be of comparatively large size, from six to seven inches in length and about an inch in diameter, and it has required the devising of many constructions and much experimentation-to arrive at a form of construction best adapted for the purpose specified, which shall have the requisite holding power and which can be started and driven to its seat without preliminary work, and which is so constructed as not to mutilate and destroy the fibers or split the wood, and which at the same time shall prevent water and moisture seeping around the spike.

The various objects above set forth I have attained by that certain novel construction of spike to be hereinafter particularly pointed out and claimed.

In the drawings, V

Figure 1 is a front elevation of my im-" proved spike.

Fig. 2 is a similar elevation of the screw threaded portion of the spike, taken at an angle of ninety degrees to Fig. 1. p

Fig. 3 is a diagrammatic section showing the screw shank and the flutes straightened out so as to illustrate the depth of the flutes at various points alon the shank.

Fig. 4.- is a bottom p an view.

Fig. 5 is a diagrammatic illustration of the screwthreads to show the difference in pitch of the upper and lower sides of the threads.

' The head 1 of the spike is preferably formed with flat sides, slightly inclined to 4 accommodate the wrench for driving the screw to place, and a flanged base 2 to engage over the edge of the rail in track construction. The shank 3 of the screw is cylindrical in shape and of uniform diameter throughout. The screwthreads 4: are out with the pitch of the upper surfaces of the threads of substantially seventy-five degrees and the lower surfaces on a pitch of sixty degrees, as indicated at 5 and 6 in Fig; 5. The threads are not ll-shaped, but a substantial base 7 is provided forming part of the cylindrical surface of the spike.

The threads are cut to the drill portion 8 at the lower end of the screw. This point 8 is substantially of the shape of the standard drill of the size of the screw.

Two spiral flutes 9, 10, are cut transverse the screwthreaded portion, so that the flutes it shall have half a turn, and the flutes are deeper at the drill portion and taper upward from the point of the drill to a point about midway of the screwthreaded portion, as indicated in Fig. 3 by the lines 11, 12, showing the depth of the flutes, or the thickness of the web at the base of the flutes. The flutes are out with a half round cutter, so that the shape of the base of either flute is semi-circular. The cuttin of the flutes leaves the drill point 8 wit two straight prutting edges 13 and 14, as indicated in 1g. at.

I have discovered that with a screw spike formed as above indicated, it will cut its own way into the hardest timber, that it takes out less wood than a screw with V-shaped threads and that the flutes balance each other and take care of the chips. The screw as it is driven in cuts the threads in the timber without mutilating the wood, and the threads form a tight seat, preventing any moisture from entering along the threads. By forming the upper thread at a seventy-five-degree pitch, greater resistance is obtained for the holdin of the spike, so that a single operator witli a twelve inch wrench can easily and rapidly drive the screws to place at any perfect water-tight seat is formed for the screwthreads.

\ With the screw spikes of ordinary construction which are now goin into use in track work, it is necessary to ore preliminary holes in the Sleepers, and thus it frequently happens that the holes are not bored in exactly the right place. With my improved construction, the screw spikes can be screwed to place at the exact point desired as rapidly as the ordinary spike can be driven.

I have found that by tapering the depth of the flutes and providing the deepest portion of the flute at the drill end, that the chips cut by the drill are readily taken care of and do not pack around the drill point, preventing its being driven easily into the wood.

Having thus described my invention, what I claim as new and desire to secure by Let ters Patent, is

1., A screw spike comprisinrr a head having a shank of uniform diameter t iroughout, with screwthreads formed thereon, and a drill at messes the end of the shank with a pair of spirally arranged flutes of uniform curvature on opposite sides of the shank, the flutes being deeper at the drill point and shallower upward.

2. A screw spike comprising a head having a shank of uniform diameter throughout,

with screwthreads formed thereon, and a drill at the end of the shank with a pair of spirally arranged flutes of uniform curvature onopposite sides of the shank, each flute being given half a turn, the flutes being deeper at the drill point and shallower upward.

EDWARD C. HOLMES. Witnesses LORENZ S. SEMPLER, KATHERINE SMITH.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2562516 *Dec 7, 1945Jul 31, 1951American Screw CoThreaded fastener
US2684492 *Oct 25, 1949Jul 27, 1954Gen ElectricCombination drilling and tapping tool
US3748949 *Oct 19, 1971Jul 31, 1973Robertson Manuf Co LtdThread system
US4171569 *Oct 19, 1977Oct 23, 1979Star Dental Manufacturing Co., Inc.Dental pin
US4583898 *Mar 15, 1983Apr 22, 1986Illinois Tool Works Inc.Drill screw and cutters for making same
US5110245 *Sep 12, 1990May 5, 1992Nitto Seiko Co., Ltd.Thread forming screw
US5759003 *Jul 22, 1996Jun 2, 1998Greenway; John MichaelCombined screw and clearance drill
US7374494Nov 19, 2004May 20, 2008Maclean-Fogg CompanyFluid connector
US7465135Nov 14, 2003Dec 16, 2008Maclean-Fogg CompanyU-Nut fastening assembly
US7654785 *Oct 26, 2007Feb 2, 2010Zyh Yin Enterprise Co., Ltd.Higher fastening screw
US8011866Sep 6, 2011Maclean-Fogg CompanyLocking fastener assembly
US20040086354 *Oct 17, 2003May 6, 2004Harris David A.Locking fastener assembly
US20040096293 *Sep 18, 2003May 20, 2004Mitek Holdings, Inc.Truss screw
US20040213646 *Nov 21, 2003Oct 28, 2004Gerard JakuszeskiU-bolt assembly
US20050103084 *Nov 19, 2004May 19, 2005Maclean-Fogg CompanyFluid connector
US20050105985 *Nov 14, 2003May 19, 2005John FritschU-nut fastening assembly
US20050123378 *Jan 18, 2005Jun 9, 2005Maclean-Fogg CompanyDecorative capped wheel nut or bolt assembly and method
US20050180840 *Nov 23, 2004Aug 18, 2005Robert BrewerFluid connector
US20050281635 *Aug 29, 2005Dec 22, 2005Wilson Larry JDecorative capped wheel nut or bolt and method of assembly
US20060051182 *Jul 28, 2005Mar 9, 2006Gerard JakuszeskiFastener assembly
US20060110232 *Nov 7, 2005May 25, 2006Maclean-Fogg CompanyThreaded fastener assembly
US20060133910 *Feb 15, 2006Jun 22, 2006Maclean-Fogg CompanyFastener cap assembly and method
US20060216130 *Jun 1, 2006Sep 28, 2006Maclean-Fogg CompanyFastener assembly
US20070025827 *Jul 27, 2005Feb 1, 2007Pryor Steven EHollow self-drilling fastener
US20070269288 *Jul 9, 2005Nov 22, 2007Sfs Intec Holding AgScrew
US20090110512 *Oct 26, 2007Apr 30, 2009Chi-Hsiang ChenHigher fastening screw
US20100174323 *Mar 19, 2010Jul 8, 2010Newdeal S.A.Self-boring and self-tapping screw for osteosynthesis and compression
DE3044001A1 *Nov 20, 1980Jun 4, 1981Illinois Tool WorksSelbstbohrende befestigungsvorrichtung und fraeser zu ihrer herstellung
EP2289647A1Aug 31, 2009Mar 2, 2011Ying-Chin ChaoMethod for manufacturing self-tapping screw with helical chip discharge channel and self-tapping screw
WO1998003799A1 *Jul 22, 1997Jan 29, 1998John Michael GreenwayCombined screw and clearance drill
Classifications
U.S. Classification411/421
International ClassificationF16B25/10
Cooperative ClassificationF16B25/0052, F16B25/103, F16B25/0015, F16B25/0078, F16B25/0047
European ClassificationF16B25/00G1A, F16B25/00G1B, F16B25/00G2, F16B25/00C1, F16B25/10B