US1657605A - Mtjltiple-cutseb-bisk - Google Patents

Description

Jan. 31, 1928.

l. c. BELL MULTIPLE CUTTER DISK BIT Filed Jan. 5, 1925 2 Sheets-Sheet l Jan. 31, 1928.

I. C. BELL MULTIPLE CUTTER DISK BIT Filed Jan. 5, 1925 2 Sheets-Sheet 2 IVAN o. BELL,

Patented Jan. 31, 1928.

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V DALLAS, TEXAS, A. CORPORATION OF DELAWARE.

MULTIPLE-CUTTER-DISK BIT.

Application filed January 5, 1925. Serial No. 540.

This invention relates to new and useful improvements in multiple cutter disk bits.

The object of the invention is to produce a tour-way cutter bit of the type set forth in my copending a} )plications Serial No. 716,970 and Serial No. T l-ELMJ".

An advantage of such an improvement is that smaller-disks and a greater number can be used, whereby increased. cutting and longor life results.

Another tleature oi the improvement is that less vibration being had crystallization is reduced to a minimum and sn'ioother run ning with less power is obtained.

Further a bit off this type is sellcentering in all formations, possesses greater strength and requires less skill on the part of the driller.

A construction designed to carry out the invention will be hereinait'cr described together with other features of the invention.

The invention will be more readily understood from a reading of the following speciiication and by reference to the acco1npanying drawings, in which an example of the invention is shown, and wherein:

Fig. 1 is an elevation of a bit constructed in accordance with iny invention, i

Fig. 2 is an underside view of the same, Fig. 3 is a cross-sectional view on the line 3-3 of Fig. 1,

Fig. 4 is a. cross sectional view onthe line 1-4l of Fig. 1, i i

Fig. 5 is a vertical sectional view of the bit,

Fig. 6 is an enlarged sectional viewon the line 6-6 of Fig. 1, and

Fig. 7 is a plan view. In the drawings the numeral 10 designates a bit body or stock having a reduced. tapored. pin 11 or any other drill st'em connection at its upper end. The pin is Slll.'l.'01l]l(led by an outwardly directed shoulder 153. The upper portion of the stock is cylindri cal, although this is merely a preferred de-- sign. The stock is termed with a depending axial stud The stock has tour equally spaced channels 14: in its outer surface provided in their bottoms with dovetailed vertical key ways 15.

{Standards 16 are formed to fit in the channels and have keys 1'? engaging in the key ways 15. These standards have their upper ends shouldered and cut back flush with the surface of thestock, but throughout the greater portion of their length, extend radially from the stock. The upper ends of the standards abut the upper ends of the channels and key ways, which thus take the upward thrust. The standards are fastened by screws 18. It is to be understood that the manner of seating and fastening the standards in the stock may be carried out in various manners.

Each standard has its lower end extending below the stock and is provided with recesses 19 and 20 with aweb therebetween andan outer web 22 flush with the outer surface of the standard. The stud 13 is four sided and has its sides parallel to the webs 21. The sides of the stud are cut back from keyways 15 (Fig. 5) so that a shoulder 23 overhangs each side of the stud, whereby the webs 21 are spaced from the sides of the stud.

An axle 24 is provided for each standard and each axle comprises ascrew threaded head 25 engaged in the outer web 22 and a reduced shouldered end 26 engaging in a socket 27 in the stud. Each axle passes through the web 21. On each axle is niounted a cutting disk 28 in the recess 19. This disk is thickest at its hub portion, being reduced or inclined one side toward its outer edge which is bevelled in the opposite direction, so as to flare from the web 21.

The width of the recess 19 is considerably greater than the thickness of the disk. This permits the disk to play radially of the bit on the axle. The disk has a central aperture 29 larger in diameter than the axle, whereby the disk may move radially of the axle and niay deflect or tilt from its normal vertical plane while rotating, thus wobbling on its axle.

As before stated the bores oil. the disks are made larger than the diameters of the axles, so that instead. of having merely a turning tit and the play usually present, the clearance. or play between the journal of each disk and its axle sluch to initially give the disk a very loose fit and a lateral or vertical. inovementor both, relative to the axle. This re sults in an amplified, wobble, oscillation or shifting of the disk which is most prominent at its periphery and also causes the disk to rotate freely. The disk thus becomes selfsharpening and this sharpening is enhanced by the shearing action of the edge of the disk, due to wobble, oscillation or shift. The plified movement not only makes for sharp but causes faster cutting due to the shearing Y action.

' disks.

' further explanation, it may be stated after nunierous by actual drilling. that the disks traversing circuitous or sinuous paths rather than singular circular paths and being under the downward pressure of the superimposed drill stem, notonly cover a greater transverse area in their travel by pcripheralcontact with the bottom of the hole, but have avery eiiective self-sharpening ac t ion,'due to the wobble, the lead or offset of the disks from the transverse axis oi the bit body and the weightplaced upon the It. is obvious that such disks will tend to chip otl' therock and shale and will out faster by kee 'i'ing a sharp edge.

By maintaining; a sharp cutting edge. by traversing a greater path and by moving transversely of its cutting are, the disks cut faster. The advantage of a continuous drilling bit which goes thri'iugrh hard as well as soft'tormations whereas it has been neces sary heretofore to come out oi? the hole and chan e bits is of reater advantage as will be appreciated by the driller. The oll'setting of the axles with. relation to the trai'isverse axis of the b1l3'1S very nnportant as this gives the disks a drag and adds to their cutting action. The central disks are also very effective in cutting out the core. V Between'the web 21 of each standard and the stud 18, disks 30 and 31, respectively, are mounted on each axle. a central aperture 30: and is otherwise the same/as the disk 28, except that it is smaller in diameter. Each disk 31 is made flat on both sides and of constant thickness, but this is subject to variation. The stud has around boss 82 surrounding each socket 27 which acts to keep the disks 31 from rubbing the sides of the studs.

The thickened hub and inclined side of the disk 30 spaces the surfaces apart. The.

disk 31 has an enlarged central aperture 31.

The disks 30 and 31 have ample play along the axle between the web and stud.

itt'hey were separated by a support therev and removing the axles 24.

between. I

A well 33 is bored axially in the pin 11 and stock 10; ater ducts 34 are cminter-bored from the bottom of the well through the stock (Fig. 5) and standards 16 so as to discharge into the recesses l9 and 20 over the disks. It will be seen that the disks are copiously supplied with water or slush and are adequately washed. \Vhen the disks, axles or standards wear out they may be readily replaced by removing the screws 18 .T Fl-ife disks" successively increasing in (ii.-

The disk 30 has ameter outwardly of the bit will cause a centering the bit and making a straight hole.

Various changes in the size and shape of the ditlerent parts, aswell as modifications and alterations may be made within the scope of the appended claims.

lVhat I claim. is:

1. In a multiple cutter disk bit, a bit body. axles mounted at substantially right angles to each other and having their inner ends supported by the body at the lower end thereof, cutter disks loosely mounted on said axles and movable laterally thereon. and removable supports for the outer ends of all the axles attached to the body.

2. In a multiple cutter disk bit, a bit body. axles mounted at angles to each other and having their inner ends supported by llll body, cutter disks loosely mounted on said axles and movable laterally and radially in a vertical plane. and renmvable supports for the outer ends of tl'ie axlcs attached to the body.

3. In a multiple cutterdisk bit. a bit body. a plurality oi cutter disks mounted at right angles to each other andbeing loose upon their journals so as to wobble when the bit isrotated, and removable standards seated in the body for confining said disks and for taking the wear as the bit is rotated.

4. In a multiple cutter disk bit, a bit body, a plurality of cutter disks mounted at an glee to each other and being loose upon their journals so as to WOblJldWllQll the bit is rotated, and removable standards seated in the body for confining said disks and for taking;

the wear as thebit is rotated, said stand ards projecting outwardly from the bit body.

5. In a multiple cutter disk bit, a bit body, removable wear members on the sides of the body at an angle to each other, transverse axles carried by the body and the members, and a plurality of cutter disks mounted to move longitudinally as well as vertically of said axles between said wear members and the body.

6. In a multiple cutter disk bit, a stock having a drill connection at its upper end, a stud depending from the bottom ol the stock, standards mounted at an angle to each other on the stock, axles carried by the stud and standards, and wobbling disks mounted on the axles.

7. In a multiple cutter disk bit, a stock having a drill oonnectionat its upper end, a stud depending from the bottom of the stock, standards mounted at an angle to each other on the stock, axles carried by the stud and standards, webs supporting the axles between the stud and standards, and disks having each a hub thickness less than the spaces between the axle supports, whereby said disks are treeto move longitudinally Eli) tii)

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of the axles, said disks being loose upon their axles so as to wobble.

8. In a multiple cutter disk bit, a stock having a drill connection at its upper end, a stud depending frointhe bottom of the stock, standards mounted at an angle to each other onthe stock, axles carried by the stud and standards, Webs supporting the axles between the stud and standards, disks having each a hub thickness less than the spaces between the axle supports, whereby said disks are tree to move longitudinally of the axles, said disks being loose upon their axles so as to wobble, and ducts in the stock for supplying liquid to each disk,

5). in a multiple cutter disk bit, a stock having seats at sulistantiaily right angles to each other, a stud. depending from the centor of the stock, standards engaging in said seats and projecting outwardly from the stock, axles having their inner ends supported in the stud and their outer ends en gaged in the standards, means for holding the standards in the stock, and a plurality of disks loosely mounted on each axle so as to Wobble when the bit is rotated.

the standards in the stock, each standard having a Web at its lower end supporting axles, the standards having recesses at the webs, and a plurality of cutter disks loosely mounted on each axle so as to Wobble, some of the disks being separated by the web.

111.. In a multiple cutter disk bit, a. bit body having); a central depending;- stud, a plurality ct axles disposed at an angle to each other and in siibstantially the san'iehorizoutai plane with their inner ends support ed by said stud, cutter disks loosely 1nonnted. on said axles and movable While revolv ing out oi": their normal plane, and supports carried by the body for the outer ends of the axles.

In testimony whereof I afiix my signature.

IVAN C. BELL.

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