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Publication numberUS62123 A
Publication typeGrant
Publication dateFeb 19, 1867
Publication numberUS 62123 A, US 62123A, US-A-62123, US62123 A, US62123A
InventorsJohn Eglin
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Improved drift
US 62123 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

@uitrit taten datent ffrr.


. Letters Patent No. 62,123, dated February 154, 1867.



Be it known that I, JOHN EGLIN, of Manchester, England, engineer, have invented certain new and useful Improvements in Drifts or Tools used forEnlarging Holesg und I do hereby declaro that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention relates to improved drifts, of roumhsguure, and other forms, such as are used for enlarging holes for bolts, pins, rivets, keys, and the like, in metal plates, bars, shafts, or blocks, the object being generally to render them more eilicient, more easily driven, `und more capable of leaving thc holes in u smooth, nished condition than the drifts hitherto in use; and in order that my said invention, and the manner of performing the saine, may he properly understood, I have hereunto appended a sheet of explanatory drawings, to he hereL inafter referred to, und representing examples of my improved drifts.

In making a drift according lto my said invention, e steel blank is taken, of a round, squarcfor other required transverse section, and having the usual slight taper longitudinally, and a series of grooves are cut contiulb ously upon it in equally inclined and opposite directions, so as to form a series of diamond-shaped cutters upon thesurface. i Y

Figure 1 is an eleva-tion; and

Figure 2, a plan of a round drift formed in this Way.

Figure 3, an eleva-tion; and

Figure 4, a plan of an oval drift.

Figures 5 and 6 are similar' views of a square drift; and

Figures 7 and 8 arc elevation and planof a ilattdrift.

v A fen' of the diamond-shaped cutting points, formed bythe grooving, are marked with the reference letter a. One side of each groove forms an obtuse angle with the surface, whilst the other side forms therewith a. rectangular, or nearly rectangular, cutting-edge, it being preferred to make this cutting-edge slightly more acute than a right angle'. If the drifts are for round holes, they may be conveniently and expeditiously formed in an ordinary lathe, by taking the blanks, prepared as usual of a tapering form, and cutting thereon a series of continuous inclined grooves in one direction; then reversing the endsof the blank, and cutting a second series of like inclinations in the opposite direction, thereby crossing the former series, and producing, by their numerous intersections, series of double-edged diamondfpointed cut-ters, which cover the whole surface. If of square or oblong form-,the'groopes are more conveniently formed by planing or filing, but their angle of intersection and their continuity may be the saine. This angle may vary with the purposes for which the tool is used, according-to the texture and hardness of the metal on which it is employed; but as a general rule the angle of forty-five degrees `is found preferable. The advantages of my improvement are, that drifts so formed cut with greater ease than the plain, continuous cutting-edges of ordinary drifts, because the points of the diamond t cutters (1,V being t-hc Vfirst to enter the metal operated upon, moet with slight resistance because of their small sizeg-and the cutting, once commenced, is continued by their diverging edges with easy gra-dation, and, cutting equally on both angles, there is no tendency of the drift to twist in the hole, orto deviate from its right direction; and, consequently, the hole is not distorted, but a perfect counterpart of the section of the tool. Itis obvious that the total length of the cutting-edges, when formed in this manner, is nearly double that of a. drift having a single series of grooves und cutting-edges in one direction only; consequently less Aforce is required, und a smoother and more finished hole is produced. This construction enables the drift to be used as a reculer, by rotation in the holc to be enlarged, as it is obvious that the angular cutting edges n'ill cut equally `Well in a horizontales in a vertical direction, and alsov equally in opposite directions,iso that the rotation may be reciprocal or vibrating, by ineens of a hand-lever or otherwise, with equally good effect.

Whnt I eluiln as my invention, and desire to secure by Letters Patent, is-

Forming tht` cutting-edges of drifts of a series of double-edged diamond cutters, by the intersection of two series ot' spirally-inelined grooves, in opposite directions, substantially :tsand for the purposes set forth.

Donc :it Manchester this 22d dny of June, 1866.



EDWARD J Usern Hennes, .Patent Agent, 2O Cross Street, Manchester. C. Serrures HUGHES, Patent Agent, 20 Gross StreegManczster.

Referenced by
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US2490029 *Dec 3, 1945Dec 6, 1949John R ClawsonHole cutting broach
US5626444 *Aug 19, 1994May 6, 1997Campian; JonathonRotary cutting tool
US6234725Dec 14, 1999May 22, 2001Jonathan R. CampianRotary cutting tool
US7090442 *Dec 9, 2003Aug 15, 2006The Boeing CompanyShaper router and method
US7326214 *Aug 9, 2003Feb 5, 2008Warsaw Orthopedic, Inc.Bone cutting device having a cutting edge with a non-extending center
US7399303Aug 20, 2002Jul 15, 2008Warsaw Orthopedic, Inc.Bone cutting device and method for use thereof
US7887565Feb 18, 2006Feb 15, 2011Warsaw Orthopedic, Inc.Apparatus and method for sequential distraction
US7993347Jul 27, 2000Aug 9, 2011Warsaw Orthopedic, Inc.Guard for use in performing human interbody spinal surgery
US20020198532 *Aug 20, 2002Dec 26, 2002Sofamor Danek Holdings, Inc.Apparatus and method of inserting spinal implants
US20040034358 *Aug 9, 2003Feb 19, 2004Sofamor Danek Holdings, Inc.Bone cutting device and method for use thereof
US20050123363 *Dec 9, 2003Jun 9, 2005The Boeing CompanyShaper router and method
US20060036247 *Oct 17, 2005Feb 16, 2006Karlin Technology, Inc.Distractor for use in spinal surgery
US20060058793 *Oct 17, 2005Mar 16, 2006Karlin Technology, Inc.Distractor for use in spinal surgery
US20060142762 *Feb 18, 2006Jun 29, 2006Michelson Gary KApparatus and method for sequential distraction
US20080287955 *Jul 18, 2008Nov 20, 2008Karlin Technology, Inc.Distractor for use in spinal surgery and method of use thereof
US20130294852 *May 1, 2012Nov 7, 2013Seco Tools AbCompression cutting tool
US20140186129 *Dec 18, 2013Jul 3, 2014David Grover FreundHigh shear cutting tool
US20140234038 *Feb 28, 2014Aug 21, 2014David Grover FreundHigh shear cutting tool
Cooperative ClassificationB23C5/14