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 numberUS23409 A
Publication typeGrant
Publication dateMar 29, 1859
Publication numberUS 23409 A, US 23409A, US-A-23409, US23409 A, US23409A
InventorsN. G. Thom
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Improved manufacture of wood-screws
US 23409 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)


Wood Screw.

No 23,409. Patented March 29, 1859.

N. PETERS. F'hulo-Lllhograubcr, Washington. D. c




Specification forming part of Letters Patent No. 23,409, dated March 29, 1859.

To a whom it may concern:

Be it known that I, N. G. THOM, of the city of Cincinnati, county of Hamilton, and State of Ohio, have invented a new and Improved VVood-Screw; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, which form a part of this specification.

The ordinary wood-screw now in use is constructed with whatis termed a single thread, as shown in the drawings at Figure I, and the labor of turning it into wood is tedious and protracted, and from the slight angle which the thread makes to the axis of the screw and the power of the screw-driver consequent upon such angle great care is required, particularly in soft wood, (into which most of the screws used are driven,) to prevent the screw being torn out, which is often done by a single turn after the screw is driven into the head, or, if not torn out, the grain of the wood sufficiently broken to prevent the screw having a firm hold. This is particularly the case when used to fasten iron or other unyielding substance to wood. The labor of turning in the ordinary single-thread screw being tedious, especially when the screw is long, it is often driven partly in with the hammer to facilitate the operation, thereby breaking the grain of the wood and rendering the screw less liable to hold; but in my improved wood-screw these objections are entirely obviated and other advantages gained.

To enable others skilled in the art to make and use my improved wood-screw, I hereby proceed to describe its construction and advantages.

The nature of my invention consists in constructing a wood-screw with two or more threads, (shown in the drawings at Fig. II as a triple and Fig. III as a double thread screw,) which threads terminate around a central tapering point, which point may end with or continue beyond the termination of said threads.

The construction of my improved screw, as above described, allows it to be turned into the wood with one-half or one-third the number of turns, respectively, as a single-thread screw, thereby saving from one-half to twothirds the time required to turn in the ordinary single-thread screw, Fig. I, of the same length and pitch; secondly, the threads be ing at a greater angle with the axis of the screw there is little or no liability to tear out the wood, yet sufficient power can be exerted on the screw to draw sufliciently tight for all ordinary purposes; thirdly, the threads being at a greater angle with the axis, as will be readily perceived by reference to the drawings, the screw obtains a better hold upon the fibers of the wood, rendering it much more firm and consequently less liable to tear out, and, fourthly, the lips ofthe threads at their termination around the point being nearly or exactly opposite, or at nearly equal distances from each other, thereis no liability to crowd thejscrew aside, as must necessarily be the case with the single-thread screw with the thread terminating on one side of the center, as in Fig. I.

I do not confine myself to any particular form of construction as to size, shape, &c., as these may be varied indefinitely, and the same construction is applicable to coach or lag screws or any other screw in which wood or other yielding substance constitute the material into which the screw is driven.

I am aware that a tapering screw-point has been long used upon augers,gi1nlets, &c., and I therefore do not claim that feature as any part of my present invention; but

What I do claim as my invention, and desire to secure by Letters Patent as a new manufacture, is

The within-described wood-screw, the characteristic feature of which consists inits having two or more parallel threads that terminate at or near the point of a tapering core, substantially as described.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6494655 *Sep 13, 2001Dec 17, 2002Conti Fasteners AgSelf-tapping screw and method for joining thin workpieces
US6712708Oct 3, 2002Mar 30, 2004Conti Fasteners AgSelf-tapping screw, blank and method for joining thin workpieces and production method for the same
US6832882 *May 24, 2002Dec 21, 2004Illinois Tool Works Inc.Fastener
US6899500 *Jun 19, 2001May 31, 2005Illinois Tool Works Inc.Fastner having multiple-bossed lead
US6956181Oct 14, 2003Oct 18, 2005Illinois Tool Works, Inc.Method for making a fastener
US7101134Mar 12, 2002Sep 5, 2006Illinois Tool Works Inc.Fastener having multiple lobed thread
US7416374 *Jan 29, 2004Aug 26, 2008Grant Prideco, L.P.Fast make-up fatigue resistant rotary shouldered connection
US7455329 *Nov 9, 2005Nov 25, 2008Grant Prideco, L.P.Fast make-up fatigue resistant rotary shouldered connection
US8858230 *Oct 13, 2008Oct 14, 2014Biodenta Swiss AgArtificial root for dental implantation and method for manufacturing the same
US9784300 *Mar 11, 2014Oct 10, 2017Hangzhou Great Star Tools Co., LtdThread-locking assembly
US20030068213 *May 24, 2002Apr 10, 2003Janisch Joseph J.Fastener
US20040054625 *Sep 17, 2002Mar 18, 2004First Data CorporationMethod and systems for providing merchant services with right-time creation and updating of merchant accounts
US20040068437 *Oct 8, 2002Apr 8, 2004First Data CorporationDiscount-instrument methods and systems
US20040079133 *Oct 14, 2003Apr 29, 2004Levey KennethMethod for making a fastener
US20040138947 *Oct 16, 2003Jul 15, 2004First Data CorporationDiscount-instrument methods and systems
US20040254833 *Jun 12, 2003Dec 16, 2004First Data CorporationPresentation instrument production systems and methods
US20060089976 *Nov 9, 2005Apr 27, 2006Grant Prideco, L.P.Fast make-up fatigue resistant rotary shouldered connection
US20060222475 *Jan 29, 2004Oct 5, 2006Breihan James WFast make-up fatigue resistant rotary shouldered connection
US20100092920 *Oct 13, 2008Apr 15, 2010Biodenta Swiss AgArtificial Root for Dental Implantation and Method for Manufacturing the Same
US20100278614 *Dec 12, 2008Nov 4, 2010Excalibar Screwbolts LimitedFixing device
US20160108952 *Mar 11, 2014Apr 21, 2016Hangzhou Great Star Tools Co., Ltd.Thread-locking assembly
CN101721257BOct 13, 2009Aug 27, 2014百丹特瑞士公司Artificial root for dental implantation and method for manufacturing the same
WO2004018317A2Aug 15, 2003Mar 4, 2004Glaxosmithkline Biologicals SaClosure system for a vial, vial, method of closing and filling a vial and stand for a vial
Cooperative ClassificationF16B25/00