US1582332A - Roller-bits drilling tool - Google Patents

Description

BRUTUS ROLLER BITS DRILLING TOOL 2 Sheets-Sheet 1' Filed Dec. 8 1923 W m Era/Z49:

Patented Apr. 27, 1926;

CARL RUSSELL BRUTU S, OF

DENVER, COLORADO, ASSIGNOR TO I 0]! DENVER, COLORADO.

WILLIAM V. SEIFERT,

ROLLER-BITS DRILLING TOOL.

Application filedpecember s, 1923. Serial No. 679,457.

To all whom, it may concern Be it'known that I, CARnR-UssELL BRU- TUS, a citizen of the United States, and a resident of the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Roller-Bits Drilling Tools, of which the following is a specification.

'roller-bits drilling-tools, and while it has been more especially devised nith reference to the boring or drilling of earth, sand, rock,

bed, strata, and analogous or other geological formations, whether the bore is to be drilled vertically, horizontally or otherwise, and whether or not employed for the drilling of wells or shafts, 'or for tunneling, mining, excavating or. other purposes, still it is to be distinctly understood and empha-- sized at the outset that the improvements,

' as to their essential 'characteristics,' are not necessarily to be restricted to any particular sphere of'usefulness, although, for the purposes of simplicity of illustration and description, the same may be more generally disclosed with reference to the drilling of wells or shafts. V

i Taken as a whole, the improvements more particularly relate to those means for drill-v ing which are characterized by the utilization of a suitable fiuid'or liquid, such as sufficiently dense sludge, forced under relatively high pressure into association with a drilling tool in operation, for flushing the drillings out of the bore concurrently with the advancement ofthe tool therein, which washing or flushing out fluid also has a tendency, under many circumstances, to soften and loosen up thesubstance being drilled. In some of these types of drilling tools at least, they embody agang or gangs of suitably grouped rotatabledisk-like bits or cutters, so mounted on the boring 'or drilling head thereof as to not only be revolved therewith but also to be individually rotated around their own axes solely by contact with the work, while at the same time severing or dislodging the latter, with a shearing or spawling act-ion, owing to their are externally mounted on stepped surfaces extending annularly of an elongated down- This invention embodiesimprovement-s in rolling contact therewith as they travel an-' nularly therearound.

It has heretofore been proposed to provide such a type of earth boring drill with which the said rolling bits or disk cutters wardly tapering drilling head, whereby each successive cut is of increasing diameter, or in other words the tool drills as it were from inverted vertex towards base position, and eliminates any centering core arising within the tool. In other instances it has been proposed to even dispose rolling bits within the zone of the drilling head, 'as distinguished from exteriorly and longitudinally thereof, thus in truth forming an internal core arising within the tool, and this whether or not the rolling bits travel around substantially the same zone or path, or are arranged in stepped groups both longitudiand transversely of the axis of the r1 Such devices, however, although very efficient it is true, still leave 'much room for,

improvement, and one of the primary ob jects of my invention, in addition to attaining maximum eiiiciency,.durability and economy in operations, is to cause the severance or annular cuts to be made of successively decreasing diameters, by means of roller bits mounted in individually ste ped successive. relation, as distinguished From grouped stepped relation, both longitudinally and transversely of the axis of the drilling head. This end is accomplished by combining a suitable shell or hollow drilling head with internally mounted rolling bits or. disk-like cutters whiclr are complementally disposed to be relatively located at positions receding towards: the axis of the drill from its boring extremity to the other end thereof, so that a core is initially formed therein, although being continuously disintegrated, whereby the drill is maintained centered against deflecting courses, such as would tend to happen when any of the cutters struck a boulder or other rounded or hard deflecting surface, and furthermore an axially extending passageway is provided to permit the more facile discharge of any foreign indurate matter, encountered by any of the cutters, such as broken tool parts or; other chunks of metal, without the succes necessity follow, however, should the roller cutter disks be externally located, aslieretofore referred to, when they would have to be divergingly disposed relatively to the boring extremity of 'the drill.

The foregoing as well as other robjects and advantages, however, it is believed will be so clearly apparent, as incidental to the following disclosure, that no useful purpose would be servedby further enlarging upon the same initially, and with these prefacing remarks, therefore, reference will now be immediately had to the accompanying drawings, illustrating a p'racticalembodiment of the invention, in which drawings like characters designate the same parts inthe several views, of which latter Figure 1 is an 'elevational view of the drilling tool, but illustrating only one of the flushing-out fluid inlet conduits, of which, however, there may be one or more; F gure 2 is a bottom plan view of thesame; Figure 3 is a transverse sectional view substantially along the line 8-3 of Figure 1, looking -1I1 the direction of the arrow, and also illustrating three of said fluid inlet condu ts; Figure l'is a'longitudinal sectional vlew through one-half of the hollow portion of the drilling head, the bore, and the core formed within'said hollow head, with the various rolling cutters illustrated as they appear when arriving at that sidev in the same longitudinal plane, rather than being shown as actually mounted correlatively, for more clearly illustrating the functioning thereof; Figure 5 is a fragmentary crosssectional view through a lower portion of the hollow drilling head, and showing the angular disposition of one of the rolling disk-like cutters, relatively to the internally formed core as aforesaid, as viewed in a transverse plane, the view being substantially a central cross-sectional view at right angles to Figure 6; and Figure 6 is substantially a central cross-se ctional view at right angles to Figure 5, showing the angular disposition of the same cutter element as viewed in 'a plane longitudinally of the drill, and both Figures'5 and 6 illustrating a preferred arrangement for mounting the rolling cutters securely against dislodgment while permitting of their free rotation.

The. numeral 7 designates a hollow base section of the drilling head, which may be cylindrical and which is prefe ably openended, especially for the larger sized tools, although in smaller sized tools the upper end may be closed, and 9 indicates a substantially solid head or boss section at the other end thereof for attachment to the drilling rod, not shown, the said boss and base sections being connected by an intermediate section which may have suitable outlet means therethrough'.

The intermediate section. although it may be of other formation, is illustrated as com-.

prising a spider-like construction that is formed by spaced arms 8, which provide laterally opening portways 0r outlet passages 10 therebetween, allowing for the discharge into the bore of the drillings' and flushing-out fluid that pass into the drilling tool, although in small sized tools this intermediate section may be of closed construction peripherally, forming a hollow bell" shaped base, closed at its upper end by the boss or head section 9, equivalently of the base section 7, but for the purpose of description I shall generally refer to the larger sized'tools, where the hollow base section is open at both ends as actually illustrated.

As a matter of practical construction, the skeleton casing of the drilling tool may be cast as an integral whole, with the hollow base section 7 of suitable enlarged dimensions relatively to the boss section 9, which latter may have a reduced threaded extension for attachment to the drilling rod, and the intermediate arms 8 being convergent from the section 7 towards the boss 9, the whole being fashioned somewhat like a bell, which provides for the boring extremity of the drill being of the greatest diameter, the said boring extremity being referred to as that end of the drill which is distant from the drilling rod, whether the bore is being drilled downwardly or otherwise.

Before more specifically describing the rolling dislelike cutters and the mountings thereof, of which one group is designated by the numerals 11-18 and another by the numerals 19-23, I will first briefly refer to the remaining features, illustrated by the drawings, which require less adequate description.

The threaded extension, for the'boss 9 as before referred to, is indicated at 2i, and there is a bore 25 that extends through this threaded extension and well into the boss 9, which bore 25 is adapted for communication with a supply conduit, not shown, for conveying the aforesaid flushing-out fluid to the tool under comparatively high pressure.

The lower end of the hollow base section 7 may be sharply beveled internally, as at 26, providing a discharge aperture 27 which is the outlet for a bore 28 that extends within the wall of the base'i', and there is also a branch bore 29. in the boss 9, in communication at 30 with the inlet bore 25, the two bores 28 and 29 beingconnected' by a suitdinally in the direction of its base, or with the non-working part of the cutter leaning away'fro-m the core, as clearly seen from.

Figures4, 5 and 6. In other words, this acute angle of incidence is such as to cause the working edge 38 ofthe cutter to bite into the c re 36 in the direction of theadvance ment of the drilling tool, or towards the axtal line thereof in the direction of its boring extremity, as well as in the directionof rotation of the drilling tool, thus causing an inwardly and downwardly undercutting of the core 36, assuming that a downwardly directed bore is being drilled, as well asan annular 'severancethereof;. and with each ofthe beveled disk-like cutters 17 to 23 shearing or spawling off the peripheral portion of the core formed by its preceding complementa-ry rolling cutter element in the manner just set forth.

' Substantially the same principle is involved'with reference to the cutter elements 11 to 16, excepting that the base surface of the extreme outer cutter ll -is disposed at an analogously sharp acute angle to a plane transversely of the drillingtool, and slightlydistant from the outer edge of the beveled a surface 26 ofthe baseshell 7, with the worl ing-e'dge of each successive cutter 12-16 slightly stepped-inwardly, regardless of its position around within the base shell 7 and with its 'base surface gradually approaching a plane parallel to the axis of the drilling tool, relatively to its immediately preceding complementary cutter, as may be best understood from the composite view. at Figure 4;.

In'other words, the action of the cutters 17-23 is to' sever the core, formed byctheir immediately preceding complementary Glltr ter, in annular and longitudinal directions,

whilethe action of the cutters -11-16 follows substantially the same principle, e3:- cepting that their severance action is more or less in an outwardly transverse direction,

aswell as annularly and in part-longitudinally with a beveling or slanting cut, somewhat in the fashion-of adishing-ont'action on the base POl'tlOnDf, the core, being continuously formed, and as distinguished from .the undeviating longitudinal"severance action of the cutters 17-23, which are projected well within the hollow drillingtool,

.whereas the cutters 11-16 have to function to undercut the core with reference to the annular wall ofthe base shell 7.

In, connection with the mounting of the rolling cutters, it is to"'be noted that the exact arrangement shown is not strictly essential, as each successive recedingly mounted cutter may bedisposed in a true' spiral inwardly convergent from the boring extremity of the drilling tool towards the boss section 9 thereof; but for convenience of'illustration, and to more clearly'dis'tinguish the several cutters 1n the drawings, some of them have been shown in diametrically arranged pairs.

F or instance, the extreme outer cutter 11 projects outwardly of the base shell 7 and also slightly beyond its peripheraltsurface,

the line of rotation of the presser bars 32, While the cutter 12 is shown also slightly projecting "beyond the said shell and as diametrically opposed to the cutter 11, but in and it may likewise project slightly beyond inwardly stepped relation both transversely and longitudinally of the drilling tool. The cutters 13 and 141 are shown in analogous re lation to the cutters 11 and 12, inwardly stepped as aforesaid, but on a diameter at right angles thereto, and the cutters 15 and 16 are likewise disposed, although the cutter 16 is located wholly within the shell 7. In like manner the cutters17 and 18 are shown diametrically disposed but wholly within the shell 7, each in inwardly stepped relation as aforesaid to thepreceding cutters, whereas the three cutters 21, 22 and 23 are triangularly disposed in the aforesaid stepped relation but within the space encompassed by the arms 8..

The location of the cutters 19-20 is apparent. but as before stated the whole ar rangement of the cutters asshown maybe altered, within certain limits, the real essential feature being that each successive cutter is mounted as an individual unit in inwardly receding stepped relation, with reference to its immediately preceding complementary cutter and not in the-plural relation of uniform series of conjointly stepped groups, both transversely and longitudinah,

said apices merging into a point with vanother, all of which provides for the shearing or spawling action of the cutters in the improved manner previously set forth.

In operation, the rolling disk 11 initially slices out an annular cut, leaving a shallow beveled annular base core portion, which in turn is likewise sliced, with more or less outwardly transverse slanting or dished-like cuts, by the successive cutters 12 to 16, inwardly stepped in recedingly mounted relation and disposed at graduate angles approaching parallelism with the axis of the tool, all substantially in the manner as here tofore described. These particular cutters- 11 to 16 are so mounted as to excavate immediately ahead of the advancing beveled connections 31, if other equivalent means areand obvious ways. -At any event the pipe ofrotation of the'-drill, so that each arm 8 would serve as a guarding abutment or fender, in advance; of one ofthe pipe connections 31., to ward off shocks on the pipe other hard substances, as the drill is rapidly connection, as from the impact of rocks 'or rotated.

the'periphery thereof at dianietric positions,

I of which, however, there may be a greater numberfor perhaps even only 'one would suflice. While these are illustrated as sub stantially rectangular elongated lugs, or

longitudinally disposed projections, obvious- 8 may extend as reinforcing ribs 3% ly they may be/of any other suitable formation, and their function is to press into the.

wall ofthe here, where feasible, any loose hard obstructins,'=such as broken off chunks of metal from toolparts which may not be so easily floated out of the here by the flushing-out liquid, that may in any way become disposed or lodged in between'the hollow base 7 and the wall of the bore.

As before suggested the upper end of the hollow base 7 is open, as at 33, in the larger sized drilling tools, to the space encompassed by the arms 8, and the lower ends of the arms well within the said hollow base.

The wall of the bore being drilled is indicated by the numeral 35, at Figure 4, and

at 36 there is designated the pedestal-like core that is formed and initially extends not only within the hollow base 7 butalso well up into the space encompassed by the arms 8, with reference to their inside faces, being gradually but continuously sheared or spawled off, as will hereinafter more fully appear.

Referring to Figures and 6, the views more particularly illustrate theangular dis.- position of the disk-like cutters 17 to 23, as distinguished from the cutters 11 to 16. They also show. the preferred manner of rotatably mounting all of the cutters, but

the cutter actually shown in these views is cutter 1S.

- It may be stated that all of the cutters 11 to 18 are rotatably attached to the base shell 7, preferably grouped around within the outer end thereof at suitably spaced distances apart, while in the larger sized tools, as shown in the drawings the cutters 20 to 23 are rotatably attached to the arms 8, likewise grouped substantially within-the space encompassed by the said arms, the arms being slightly enlarged at the positions 'of'such attachment if desired, and the cutter 19,

although I have illustrated eight cutters in one group and five in the other group, this is merely' a matter of expediency in illus-' tration, as obviously there may be a greater ora lesser-number of cutters in either or both groups, as such, the principal i'deabeing that -a series of'such cutters extend in successively receding relation, and at suitablyvspaced positions relatively to each other, around within'the base shell 7 and the intermediate groups, and, for that matter, it is not strictly essential atall that there be two distinctive The numeral 3-2 indicates a pair of ribs; or abutments disposed externally of the'hollow base 7, and'extendinglongitudinally of outlet'section 8, when that section actually provides an outlet from the boring extremity of the drill, which is ofthe greatest diameter. By virtue of such arrangement, each successiveannular cut is of decreasing diameter, thereby lessening the load and torsional strains and stresses on the drilling tool, by cutting away the work with graduate reduced cuts approaching the axis of the tool, the said cuts being concurrently made from a plurality of stepped and balancing positions, with the aforesaid cutters also cooperating in such balanced relation that the drilling tool is maintained centered at all times against a deviated course, as will later more clearly appean.

The rolling cutters themselves are preferably of disk-like frusto-conical form, the base thereof in conjunction with the beveled face 37'forming a sharp annular shearing or knife edge 38. and the face oppositethe base having a cylindrical shank 39 that terminates in a reduced threaded end for the reception of a nut 40.

The wall of the base shell 7, or when attachment is made to one of the arms 8 then the arm itself, is bored as at 41 and counterbored as at" 4-2,, the former for the reception of a bushing 43, for j ournaling the shank 39, and the latter for the reception of a washer 4 .4 and the nut -10. The washer 44', which encompasses the reduced threaded end of the shank 39,-fits snugly up against the annular.

shoulder formed therebetween, so, that there is left a slight annular clearance space 45, whereby the shank 39 has a limited axial play in its bushing 43, and thus allows for a free rotation therein. while anchored against axial dislodgment by the washer A and nut 40 turning therewith.

It will be observed that the angular dis-- position of the cutter 18 with reference to the core 36, and the same is true of the cutters 17, 19,. 20, 21, 22 and 23, is such that the base surface thereof extends ata sharp inclination or acute angle to the periphery of the core 36. not only cireumfercntially thereof but also longituif there be more than one inlet line, into association with'the boring extremity of the,

magma face 26 of the shell 7, as clearly seen from the drawings and heretofore described. The remainder of the core 36, which extends from its base well up Within the hollow drilling tool, is sheared or spawled oif' withannular longitudinal or spiraling cuts, by the rp-lling cutters 17 to 23, in the manner as clearly illustrated and heretofore fully described. At the same time, with this plural series of concurrent successively receding severances the. flushing-out fluid or liquid, such as a suf- .ticiently dense sludge-like mixture, is forced under comparatively high pressure through the fluid inlet line, 2530-29 3128, and discharges through the outlet 27,01 outlets @001, thus washing out by flotation the drilling within the bore being formed in a man ner that is well understood in the art, but with my particular improvements, especially with the larger sized drilling tools the 1najor portion of the drillings and wash or flushlug-out liquid passes up within the tool,

through the longitudinal passageway estabsubstantially spaced rolling cutters, and out into the bore through the lateral outlet means provided for by the intermediate section 8, although ammor portion may pass between the base shell 7 and the contiguous wall of the bore. 1 In the smaller sized tools, however, where the upper end of the base section may be closed and not open to provide an outletmeans, all of the. drillings and flushing out liquid pass out underneath the shell 7 and up betweenthe latter and the contiguous wall of-the bore, if a flushing out liquid be employed, and, whether or not a flushing out liquid be employed, these smaller sized tools may be withdrawn, at will, and any contentsof the hollow shell discharged at the surface of the bore.

In addition to the main'functioning of the angular disposition of the rolling cutters, it may be briefly suggested, in passing, that the.

outer edge faces of the base surface and the beveled surface 37 ,thereof are constantly and smoothly'abraded, as it were, by their rolling incisive contact with the earthy or rocky matter of the core 36, so that the annular cutting edge 38 is maintained substantiah' 1y sharpened after the fashion of hollow grinding.

Finally, it should also be seriously noted that, as each of the rolling cutters bites into the core at varied positions therearound and therealong for its full length, there are thus provided opposing or balancing forces for maintaining the drilling tool centered at all times. For instance, if the cutter 11 should stril're'a boulder, there would be a forceful tendency to deflect the course of the tool, but practically all of the other cutters would counterbalance or oppose that tendency with a much greater 'force; .and the same would hold true if an of the other cutteis--xer6 to strike an, indurate deflecting surface within the core 36.

1. .Although I have thus completely disclosed the improvements, it is to be understood that I do not wish to unnecessarily restrict the invention to all'of the details exactly as set forth and illustrated, excepting asthey may' come within the terms of the ensuing claims, or equivalent combinations of elements thereof, or as fairly interpreted in the light of the specification if necessary. VVhat- I do claim, as new and patentable, 1s:

l. A drilling tool embodying means, in combination, coacting to concurrently make aconstant set of annular spirally advancing spawling cuts that successively decrease in diameter, relatively to the direction'of advance of said tool, the said cuts being so recedingly stepped that the peripheral portion of the core formed by an immediately preceding severance is itself annularly severed by the next immediately succeediiigcut. v

y 2. A drilling tool embodying a hollow section and roller cutter elements so formed and mounted within said hollow section as to coact, in combination, to concurrently make a constant set of annular spirally advancing spawling cuts that successively decrease in diameter, relatively to the direcbeing so recedingly stepped that the peripheral portion of the core formed by animmediately preceding severance is itself annularly severed by the next immediately succeeding cut, with tlNifOI'GIHOSt severances being dished'out more or less transversely,

in a graduate slanting approach towards the longitudinal direction of the bore, while the remaining severances are cut in substantially the longitudinal direction of the bore.

4. A drilling tool embodying a hollw section, open at its outer end, and a plurality-ofroliipgcutter elements substantially wholly encased wit hin"said hollow section and mounted therein in recedingly stepped relation from the outer end thereof, someof said cutterelements being disposed at suitable anglesiiith e path of adyancement of the wall of said hollow section, while others are disposed substantially in a direction longitudinally thereof.

5. A drilling tool embodying a hollow section, open at its outer end, and a plurality of frusto-conical rolling cutter elements encased substantially wholly within said hollow section,"being mounted therein in recedingly stepped relation from the outer end thereof, both transversely and longitudinally relatively to said"h'ollow section, and the said cutterelements being disposed wi'tii'their bases towards the axis of said too 6. A drilling tool, embodying a hollow base open at its outer end, discharge outlet means therefor, and a plurality of rolling cutter elements, internally disposed relatively to said hollow base and rotatably mounted in individually successive recedingly stepped relation from the outer end thereof. 7. A drilling tool, embodying a hollow base open' at its outer end, discharge outlet means therefor, and a plurality of rolling cutter elements, internally disposed relatively to said hollow base and rotatably mounted in individually successive recedstepped relation from the outer end thereof, some, of said cutter elements being disposed at suitable angles in the path of 1dr vancement of the wall of said hollow base, while others are disposed substantially in a direction longitudinally thereof, and all of 'said cutter elements being mounted with their bases disposed towards the axis of said tool.

9. A drilling tool, embodying a hollow base open at its outer end, discharge outlet means therefor, a plurality of rotatably mounted cutter elements, internally disposed relatively to said hollow base in successive recedingly stepped relation from the outer end -thereof, some of said cutter elements being disposed at suitable angles in the path of advancement of the wall of said hollow base, while others are disposed substantially in a direction longitudinally thereof, and presser bar means extending externally of the outer wall surface of said hollow base. 7

10. A drilling tool, embodying a hollow base open at its outer end, discharge outlet means therefor, and a plurality of rolling cutters, internally disposed relatively to said hollow base in successive suitably receding stepped relation from the outer end thereof,

being mounted to independently rotate as well as to be bodily'revolved annularly with said tool, some of said cutters being disposed at suitable angles in the path of advancement of the wall of said hollow base, while others are disposed substantially in a direction longitudinally thereof at a sharp angle both as to the line of annular revolution and the axis of the tool in the direction of advance outer end thereof, being "mounted to vindependently rotate as well as to be bodily revolved annularly with said tool, some of said cutters being disposed at suitable angles in the path of advancement of the wall of said hollow base, while others are disposed substantially in a direction longitudinally thereof at a sharp angle both as to the line of their annular revolution and the axis of the tool in the direction of advancement thereof.

12. A drilling tool, embodying a hollow open-ended base, a head portion, an intermediate section having discharge outlet means in communication with said base, and a plurality of rolling cutters, internally disposed relatively to said base and intermediate section and rotatably mounted in successive suitably receding stepped relation toards said head portion.

13. A drilling tool, embodying a hollow open-ended base, a head portion, an intermediate section having discharge outlet means in communication with said base, and

a plurality of rolling cutters, internally dis- 1 posed relatively to said base and intermedi' ate section and rotatably mounted in successive suit-ably receding stepped relation towards said head portion, some of said cutters being disposed at suitable angles in the path of advancement of the wall of said hollow base, while others are disposed substanti'ally in a direction longitudinally thereof.

14. A drilling tool, embodying a hollow open-ended base, a head portion, an intermediate section having discharge outlet means in communication with said base, and a plurality of rolling cutters, internally disposed relatively to said base and intermediate section, mounted to independently rotate as well as to be bodily revolved annularlyof the axis of the tool, some of said cutters being disposed at suitable angles in the path of advancement of the wall of said hollow base, while others are disposed substantially in a direction longitudinally thereofat a sharp angle bothas to the line of their annular revolution and the axis of. the direction of advancement nally spacedar ns therebetween-to provide i lateral discharge openings in communication with said base, and a plurality of rolling cutters, internally disposed relatively to said base and spaced arms, rotatably mounted in successive suitably receding stepped relation from the outer open end of said base towards said head portion.

16. A drilling tool, embodying a hollow open-ended base,.a head portion, longitudt nally spaced arms therebetween to provide for lateral discharge openings in communication 'with said base, and a plurality of rolling cutters, internally disposed relatively tosaid base and spaced arms, rotatably mounted in successive suitably receding stepped relation from the outer end of said base towards said head portion. some of said cutters being disposedat suitable spirally dishing out angles in the path of advancement of the wall of said hollow base, while others are disposed substantially in a direction longitudinally thereof.

17. Adrilling tool, embodying a hollow open-ended base, a head portion, longitudinally spaced arms therebetween to provide for lateral discharge openings in communi- ;-cation with said base, and a plurality of rolling cutters, internally disposed relativelyto said base and said spaced arms, mount- 'cd to independently rotate on their own axes as well as to be bodily revolved annularly of the axis of the tool, some of said cut-v ters beingdisposed at suitable spirally disliing out angles in the path of advancementof the Wall of said base, while others are disposed substantially in a direction longitudinally thereof at a sharp angle both as to the line of their aforesaid annular revolution and as to the axis of the tool in the dihead portion.

18. A drilling tool, embodying a hollow open-ended base, a reduced boss-like head portion, longitudinally spaced arms therebetween, converging from-said base to saidhead portion, to provide for lateral elo'ngated discharge openings in communication with saidibase, and a plurality of rolling cutters, internally disposed relatively to said successive suitably receding stepped relation from the openouter end of said base towards said head portion, some of said cutters being here being drilled. base and spaced arms, rotatably mounted in disposed 3 at suitable spirally dishing out ang es in the path of advancement of the wall of said base, while others are disposed substantially in a direction longitudinally thereof. i

19. A drilling open-ended base, a reduced boss-like head portion, longitudinal y spaced arms therebetween, converging from said base to saidhead portion, to provide for lateral elon gated discharge openings in communication with.said base,'and a plurality of rolling tool, embodying a hollow cutters,.inte'rn'ally disposedrelatively to said base and said spaced arins, inounted in successive suitably receding stepped relation, 1

from the open outer end of said base towards said head portion, to independently rotate on their own axes as well as to. be bodily revolved annularly of the axis of the tool,

some of said cutters being disposed at. suita A ble spirally dishing out angles in the path of advancement of the wall of said base, .while others are disposed substantial y in a direction longitudinally thereof at a sharp angle both as to the line of their aforesaid annular revolution and as to the axis of the tool in the direction ofadvancement thereof.

20. A drilling tool, embodying a hollow open-ended section having "spaced arms longitudinally projected from one end thereof and convergingly disposed in the direction of their projection, the longitudinal spaces between said arms providing for elongated passageways opening from the exterior of the tool to theinterior of said open-ended l hollow section, and -a plurality of rolling cutters mounted to rotate on their own axes as well as to be bodily revolved annularly of the axis of the tool, the said cutters bein suitably disposed in successive suitably receding stepped relation from one end of the tooltowards the other end thereof.

21. A drilling tool, embodying a hollow openended section having spaced arms longitudinally projected from one end thereof and convergingly disposed inthe direction of their projection, the'longitudinal spaces between said arms providing for elon gated passageways between tlie interior of said open-ended hollow section and the ex terior of the tool, a plurality of, rolling cutters mounted to rotate on their own axes as well as to be bodily revolved annularly of; the axis of the tool, the said cfu'tters being suitably disposed in successive suitably receding steppedrelation from one end of the tool towards the other end thereof, and fluid conduit means associated with said tool for delivering a suitable flushing out medium intoassociation with said cutters within the i hollow base and rotatably mounted in successive suitably receding stepped relation from the open outer end thereof, some of said cutters being disposed at suitable angles in the path of advancement of the wall of said hollow base, while others are substantially disposed in a direction longitudinally theerof, and fluid conduit means associated with said tool for delivering a suitableflushing out medium into association with said cutters within the bore being. drilled.

23. A drilling tool, embodying a hollow base open at its outer end, discharge outlet means therefor, a plurality of frusto-conical rolling cutters, internally disposed relatively to said hollow base androtatably mounted in successive suitably receding stepped relation from the open outer end thereof, some of said cutters being disposed at suitable angles in the path of'advancement of the wall of said hollow base, while others are disposed substantially in a direction longitudinally thereof, and fluid conduit .means associated with said tool for delivering a suitable flushing out medium into association with said cutters w1thm the bore being drilled.

24. A drilling tool, embodying a hollow base open at its outer end, discharge outlet means therefor, a plurality of rolling cutters, internally disposed relatively to said hollow base in successive suitably receding stepped relation from the outer open end thereof, being mounted to independently ro tate on their own' axes as well as to be bodily revolved annula-rly of the axis of the tool, some of said cutters being disposed at suitable spirally dishing out angles in the path of advancement of the wall of said hollow base, while others are disposed substantially in a direction longitudinally thereof at a sharp angle both as to the line of their aforesaid annular revolution and as to the axis of cutters within the bore beingdrilled.

25. A drillingtool, embodying a hollow baseropen at its outer'end, discharge outlet means therefor, a plurality of rolling frustoconical cutters, internally disposed relatively to said hollow base in successive suitably re ceding stepped relation from the outer open end thereof, being mounted to independently rotate on their own axes as well as. to be bodily revolved annularly of the axis of the tool, some of said cutters being disposed at suitable s 'virally dishing out angles in the path of advancement of the wall of said hollowbase, while others are disposed in a direction substantially longitudinal thereof at a sharp angle both as to the line of their aforesaid annular revolution and as to the axis of the. tool in the direction of advancement thereof, and fluid conduit means assoeiated with said tool for delivering a suitable flushing out medium 'into association cutters. internally disposed relatively. to said base and spaced arms, rotatably mounted in successive suitably receding stepped relation from the outer end of said base towards said head portion. some of said cutters being disposed at sunably spirally dishing out angles in the path of advancement of the wall of said hollow base, while others are disposed substantially in a direction longitudinally thereof, and fluid conduit means associated with said tool for delivering a suitable flushing out medium into association with said cutters within'the bore being drilled.

27. A drilling tool, embodying a hollow open-ended base, a head portion, spaced elongated arms longitudinally projected therebetween to provide for elongated lat-' eral discharge openings in communication with said hollow base, a plurality of rolling cutters, internally disposed relatively to said hollow base and said spaced arms, rotatably mounted in successive suitably receding stepped relation from the open outer end of said hollow base towards said head portion,

some of said cutters being disposed at suitable spirally dishing out'angles in the path of advancement of the wall of said hollow' base, while others are disposed substantially in a direction longitudinally thereof, and fluid conduit means for delivering a suitable flushing out medium into association with said cutters within the bore being drilled, saidfiuid conduit means including piping disposed eontiguously of the rear face of at least one of said elongated arms with reference to the direction of the working rotation of said drilling tool..

In testimony whereof, I afiix my signature.

CARL RUSSELL BRUTUS.

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