USRE3142E - Improved dbill-bit - Google Patents

Description

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HORACE T. LOVE, OF NEW YORK,'N. Y., ASSIGNEE OF WILLIAM W. GRIER AND ROBERT H. BOYD.

Letters Patent No. 47,812, dated May 23, 1866; r'n'uue No. 3,142, dated September 29, 1868.

IMPROVED DRILL-BIT.

T0 WHOM 'IT MAY coivonnm Be it known that WILLIASI W. GRIEB. and ROBERT H. BOYD, of Hhlton, in the county of Allegheny, and

' State of Pennsylvania-{have invented a new and improved DrilLAuger or Bit, for boring and drilling coal,

iron, stone, and similar purposes, and have assigned their entire right, title, and interest in and to the same to HORACE T. LOVE, of the oity, county, and State of New York, his heirs and assigns. Now, therefore, I, the said HORACE T. LOVE, assignee, as aforesaid, do declare that'the following is a. full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, wherei'n Figure 1 is an isometrical perspective view of a drill-auger or auger-bit, showing particularly the notch or recess at its central point I l I Figure 2 is a side view of the same..

Figure 3 is a similar view, showing the tool armed with diamonds, carbons, or other hard cutting-points,

and indicating, by red 1ines, the relation which these points sustain to the axial line of the tool, and also the relation which these points sustain to each other.

Figure 4 shows a transverse section of fig. 2.

In order to enable others skilled in the art to make and practise this invention, [will explain its construction, as shown in fig. 3 L

The drillor drill-bit is made in the form shown in fig. 3, in which a represents the cutting-points, which are either of hard metal, carbons, or diamonds, and a, red lines, showing the position and shape of the cuttingpoints, relatively with the axial line of thebit and right lines thereto. The cutting-points ashould be as hard as possible, not to be brittle and break. Hardened steel or other metal may answer for coal and the softer stones, but carbons or diamonds for rock, particularly if hard, aregreatly to be preferred.

The hard cutting-points a, either single or in pairs, 'are arranged or set at different radial distances in relation to the axial line of the tool, the two foremost on different sides thereof, with a recess, space, or notch between their extreme points, while the remaining points, by recurring to the red lines a, which are designed to be drawn respectively at right angles to and parallel with said axial line, will be seen to have their extreme ends dip," forming an acute angle at the cutting-point, which is advanced further forward than the base of the preceding point in its outer line, and in their relation to each other to cut concentric parallel grooves, leaving intermediate lands to be chipped or ground out, or otherwise removed by the wedge-like points or edges, as thetool is fed forward in operation.

This disposition of the cutting-edges is important to the invention, and cannot be-overestimatcd.

The bottom of the hole .bored, conforming to the shape of theforward end or face of the tool, will have slight elevation kept cut to a uniform siie, whose apex will cdrrespond to the, axial line of. the drill, and will act to lead, guide, or conduct the tool in a straight line as it penetrates when in operation. The concentric grooves, cut with intermediatelands, also serve precisely the same purpose, while the chipping out of these intermediate lands, as the tool is fed forward, as aforesaid, serves to make it bore more expeditiously.

This tool, designed originally to intercut a. collateral hole to channel, would be of little value in the absence of devices for boring rapidly and straight, which is perfectly done by this construction of drill or drill bit.

' No importance, except convenience of construction or setting, is attached to arranging the cutting-points in longitudinal lines, as shown in fig. 3. They may be set so, or otherwise, only that they are respectively so arranged in their radial relation to the axial line, as; aforesaid, that they remove the entire lands and surface embraced within the circle described by the outermost edges, which outermost edges determine the greatest diameter of the holes bored.

-And no particular importance is attached to the shape of the body or head of the bit. It may be made round or flattened, longer or shorter, thicker or thinner, with or without screw-shank for attachment, square- 'lhanked or otherwise, and the face may be oval, sharp, angular, or otherwise, such being more mechanical details, well kuewn, and may be varied, as'desi red, according to the various pos'ifione and conditions wheyhi t istobeusecL- T While I'have shown,- in figs. 1, 2,, and 4, another form of a drill pr drill-bit, such'ferm or conatruct ibn l a not olmim as I prefer thatehevin in' fig. 3, the cutting-edges of-which are diamonds or other hard cutting substances',"and project frnrd of m bmoa the pending po i nt, C

What I claim n t-ho inventionof GRIER and BOYD, and desire t6 secu re by Letters Patent, is-'- v rotating drill of drill-bit, whose edges of dinmondyor'other hard cutting-points; are separated at its fdrwagd-epdby a recese or notch, and are arpanged with i'elatiom to the axia l line of the tool and each other, substenbially in the manner and for the puypose described. I

I HORACE T. LOVE. Witnesses:

EUGENE SMITH, GEO. W. Fqx.

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