US1935654A - Combination bit shank - Google Patents

Description

1933- E. E. MILLICAN COMBINATION BIT SHANK Filed July 15, 1931 E M N w w 6 mm p I 1 I I I I I l I I I I I 1 l 1 l x 1 u l. 9 /4 1. 5 /1 2 y W g y g Patented Nov. 21, 1933 UNi'TED s'rA'rEs COMBINATION BIT SHANK Earl E. Millican, Long Beach, Calif., assignor to Allie O. Millican, Long Beach, Calif.

Application July 15, 1931. Serial No. 550,918

23 Claims.

My invention relates to a combination bit shank used for deep well drilling.

An object and feature of my invention is the construction of the shank with a plurality of separable parts to allow separation and assembly of these for the ready fitting of different types of disk bits or cutters and for readily changing the arrangement of the bits and cutters.

Another object and feature of my invention is in a bit shank to have a removable side plate on one side, this plate forming the means for supporting and confining an enclosed journal for the axle of the disk bits, and such plate being readily attachable and removable from the-side of the body of the shank.

Another object and feature of my invention is in a bit shank to have separable parts for supporting, connecting and disconnectingthe disk bits, and to have these secured together in operative position by a connection to a sub or the'like, which latter is connected to the drill pipe.

A more specific object and feature is the provision of the removable side plate, this being slidable longitudinally of the body of the shank and being connected to the shank by a dove-tailed guide, and also holding in place a dove-tailed loose plate which forms one end for the axle pin of the disks, and this slidable holding plate has a screw threaded upper end aligning with the threads on the shank and forming a pin which is held in the box of the sub.

A further general object of my inventionis securing the axle pin and disks of a disk type of bit in position without using securing pins, keys, or screw threaded connections; and a feature of my connection is that the various connecting parts of the bit shank which hold the pin and the disk cutters in place are protected from wear on the formation. Therefore there is but little chance of the pins and the disks coming loose.

My invention is illustrated in connection with the accompanying drawing, in which:

Fig. l is an elevation taken in the direction of the arrow 1 of Fig. 2 partly broken away;

Fig. 2 is an elevation taken in the direction of the arrow 2 of Fig. 1 with parts broken away;

Fig. 3 is a vertical section on the line,3-3 of' Fig. 2 in the direction of the arrows;

Fig. 4 is a transverse section on the line 4-4 of Fig. 2 in the direction of the arrows;

Fig. 5 is a horizontal section on the line 5.5,of Fig. 3 in the direction of the arrows;

Fig. 6 is an inside elevation of a removable side plate.

In considering'my invention, the bit shank as an assembly is designated by the numeral 11. This has a substantial body structure 12 with a central portion 13, and on one side there is a depending leg 14. The body structure of the shank has a flat side 15 With a dove-tailed projec- I ticn 16, and on this is fitted the remobable holding and retaining plate 17. Such plate has a longitudinal recess 18 with projecting side ribs 19. This recess is undercut in a dovetailed manner to fit the dove-tailed projection 16 on the side of the body. The lower end of this plate has a closure rib 20 but the upper end 21 is open. The upper end also has a squared abutment end 22' and there are a pair of side, deep, narrow notches 23. r

These notches 23 are caused by the pin portion 24 of the holding plate 17 being tapered upwardly and the dove-tail on the inside of this holding plate meeting the taper of the threads, hence, there are notches 23 formed at the root of the dove-tail at the top of the holding plate 17.

The lower portion of this plate maybe considered as forming a side leg 26, leaving a space 27 between the two legs to accommodate the disk bits. A loose journal plate 28 has an outer face 29 wider than its inner face 30, thus forming a dove-tailed shape in cross section. Such plate has an upper abutment end 31 which fits in a side socket 32 at one side of the body portion 13 of the, shank. This plate at the top is of the same width as the lower portion of the dove-tail 16 on the body of the shank and tapers downwardly as indicated in dotted lines in Fig. 2. Near the lower portion of this plate there is a square opening 33 which accommodates the squared end 34 of the axle pin 35. This axle pin has its opposite end 36, which end is formed cylindrical, housed in a cylindrical socket 37 on the inside of the leg 14. Thus the axle pin is supported on one side on this support and on the other side in the squared opening 33 of the loose plate.

In order to provide for slushing mud or the like the shank has acentral bore 38 from which extend a pair of ducts 39, these having discharge openings 40 (note Fig. 1) which discharge directly downwardly into the center of the open space 27 beween the leg 14 and the leg portion 26 of the side plate. It will be noted that the pin portion 25 of the shank has the usual taper and a contacting shoulder 41. As above mentioned, the taper on the pin and on the upper end of the removable side plate 1'7 is threaded, forming a pin, and this is threaded into the box 42 of the sub 43, which sub is secured to a tooljoint 44 and this latter is secured to the drill pipe 45.

" tion have a dove-tailed connection and are pro- In this application I do not desire to be restricted to any particular type of disk or other cutters but illustrate a suitable construction which may be used with this shank. In this construction the axle pin 35 has two eccentric sections 46, these being adjacent the outer portion and with two eccentric collars 47 at the center. Bushings 48 are fitted on the eccentric portions of the ring, these having a side flange 49. Loose collars 50 are also mounted on each eccentric 46 and are utilized to confine the hub portion 51 of the disk cutters 52, these cutters bearing at their center on the bushings 48. When the axle pin is removed the disk cutters and the bushings are readily removed.

The mode of assembly and operation of my invention is as follows:

A suitable type of disk cutter is. placed on the axle pin, this having a round end, as above mentioned, thrust in the socket 37. The opposite end of the pin is supported in the square opening 33 of the loose supporting plate 28. The removable side plate 17 is-then slid upwardly, the longitu dinal recess fitting on the dove-tail 16 of the shank and having itslower edge 20 on the inside engage the lower portion of the plate 28. The upper portion of the plate l'l being screw threaded andtapered allows attachment of the sub, the sub, therefore, holding this assembly of parts in their operative position.

The pin axles being mounted eccentrically in the legs are so arranged that the disks have a short lead beyond the legs in, their direction of rotation, which arrangement causes the disks to have an even cutting action on the vertical sides and on the bottom of the hole.

It will be noted by my construction that the elements of the bit shank which hold the axle pin and the disks in position being composed of the, plate 28 and the removable side leg constructectedfrom wear on the formation on the cutting action of the bits. There are no connecting parts which may wear and thereby allow dropping of w the axle or the disks.

Various changes may be made in the details of construction without departing from the spirit or scope of the invention as defined bythe appended claims.

I claim:

1. A combination bit shank comprising a shank body having a connectible and disconnectible side plate,- said plate forming a leg on one side of the shank, the main body of the shank having another leg formed integral therewith, means formand the opposite Side being 7 flat with a 1Ongi ing aguiding connection between said plate-and the body portion of the shank to allow longitudinalsliding of the plate forconnecting and disconnecting, an axle pin, means cooperating with the removable plate to secure the'axle pin in position between the two legs, and means to attach said plate to thebody structure of the shank.

2. A combination bit shank as claimed in claim 1, the guiding connection providing a dove-tailed projection and a dove-tailed groove for interconnecting the removable plate and the body structure-of the shank, said plate being insertable fronr-the-lower end of the shank structure and slidable upwardly, and means forming a limit to the upward movement of said plate.

3. A combination bit shank as claimed in claim 1, a lose axle supporting plate mounted in the removable plate and forming a support for one end of ;.the axle pin,-the other end being supported in the leg connectedto. the bodyof the shank;

said supporting plate being connectible and disconnectible from the plate forming the leg by a relative sliding movement of said plates.

4. A combination bit shank comprising a shank body having a leg formed integral therewith on one side, a slidably mounted retaining plate forming a leg on the opposite side, an interlocking guide means between the body structure and said plate, an axle supporting plate having a slidable connection with the retaining plate, said retaining plate being connectible by sliding upwardly on the shank and on the plate supporting the axle, the retaining plate retaining the supporting plate in position, an axle pin having its ends nonrotatably mounted in the removable supporting plate and in the integral leg of the shank, and means to attach the retaining plate to the shank.

5. A combination bit shank as claimed in claim 4, the shank body having an abutment at its upper end, said retaining plate fitting against said abutment, the upper end of the retaining plate and the upper end of the body structure of the shank having screw threads formed in alignment, and said screw'threads being adapted for connection to a tooljoint for attaching to a string of drill pipe.

6. A combination disk bit comprising a shank body having a leg formed integral therewith on one side, the opposite side being flat and having a dove-tailed, longitudinal projection, aremovable leg plate having a longitudinal, dove-tailed recess to interconnect with the projection, said 7 recess being open at the upper endand closed at its lower end, there being a space, formed between the two legs, an axle pinbhaving one end fitted in the leg integral with the shank, means securing the other end non-.rotatably mounted in the'shiftable leg, and means to attach the Shiftu tatably support the axle pin, there being an abut-v ment or shoulder at the lower end of the dovetailed recess to engage the end of said plate, the upper end of the shank and the upper end of the removable leg being threaded and adapted to be secured to the same threaded coupling.

,8. A combination bit shank comprising a shank body having a leg formed integral on one side tudinal dove-tailed projection, the upper end of the shank being tapered and having screw threads, such threads in part being interrupted dove-tailed in section and tapered toward the bottom, with a' bottom closure having a shoulder, a relatively loose plate beveled on its edges of the same slope as the dove-tail of the projection, said plate being adapted to align with the projection and to fit in the dove-tailed recess of the removable leg, said recess beingopen at the top and being insertable from the lower end of the projection on the shank, there being an abutment in the shank to engage the upper end of the leg,

' the upper .outer portion of the leg having a tapered thread of the same type and pitch'as that on the shank to be engaged by a holding coupling,

andmeans in the integral leg and in the loose projection.

plate to non-rotatably hold an, axle pin, said pin 7 having means for mounting cutters.

9. A combination bit shankas claimed in claim 8, the upper portion of the removable leg plate having a pair of notches, said notches permitting exposure of the upper edge or the dove-tailed 10. A combination bit shank having a shank structure formed with a plurality of conneetible and disconnectible elements and with means to secure a bit between said elements, a connecting and rotating means to a string of drill pipe for retaining said elements in operative position and for rotating said elements, and an additional means independent of the connecting means for retaining said elements from relative lateral movement in any direction independently of said connecting and rotating means.

11. A combination bit shank comprising a shank structure having a pair of legs, one of said legs being integral with the shank and the other leg being removable, an axle pin, means forming a mounting for the pin, cutting bits on the pin, the removable leg retaining the pin in position be,- tween the pair of legs, an attaching means securing the removable leg to the body of the shank, and means independent and additional to said attaching means to attach the together to restrain lateral movement of the legs one in relation to the other at the axle pin in a direction at right angles to the axle pin.

12. A combination bit shank comprising a shank body having a leg formed integral therewith on one side, a removable leg slidably connected to the shank body to slide in a longitudinal direction of such body, there being a space between the lower ends of such legs, means to support an axle between the lower ends of said legs, and bits on said axle operating in said space, an attaching and driving means for securing the upper end of the removable leg to the shank body and adapted for connection to a drill pipe for transmitting rotary motion to they shank body and the legs, means formed integral with the shank body, and a second means formed integral with the removable leg for securing such leg to the shank body independently of the attaching means, said integral means preventing relative lateral movement of the lower ends of the legs in any direction.

13. A combinationbit shank comprising a shank body having a leg formed integral therewith on one side, a slidably mounted retaining plate forming a leg on the opposite side, an interlocking guide means between the body structure and said plate for sliding said plate upwardly longitudinally on the bit shank from its lower end, an abutment means for limiting the upward sliding, there being a space between thelower portions of said legs, means to mount an axle pin between the lower portions of said legs, cutting bits on the axle operating in said space, and an attaching and driving means between the upper end of said plate and the shank body for attaching said plate to the shank body and preventing longitudinal sliding of such plate, said attaching means forming a rotary drive connection for a string of drill pipe.

14. A combination bit shank comprising a shank body having a first leg formed integral therewith on one side, a slidably mot nted retaining or holding plate forming a leg on the opposite side, a guide means for sliding the retaining plate longitudinally of the shank body from the lower end thereof, an abutment to limit the up ward sliding of said plate, therebeing a space between the lower end of said legs, means to mount an axle pin operating in said space, an attaching and rotating'means attaching the upper end of the holding plate to the shank body and forming means for transmitting rotary motion from a drill pipe to this shank body, said attaching means forming the sole restraining means for preventing removal of the holding plate downwardly in a longitudinal direction.

, A combination bit shank as claimed in claim 14, the lower portion of the holding plate having a journal plate secured thereto, and the axle being connected betweenthe journal plate and the integral leg.

16. A combination bit shank comprising a shank body having a leg formed integral there with on one side, a slidably mounted retaining plate forming a leg on the opposite side, there being a dove-tailed locking guide structure between the shank body and said retaining plate for sliding said plate upwardly in the lower end of the shank body, said retaining plate at the bottom having a closure rib, means for mounting an axle pin secured to the lower portion of the retaining plate and the lower portion of the integral leg, bits on said pin, an attaching and rotating means connecting the upper portion of the retaining plate and the shank body and transmitting rotary motion from a string of drill pipe to the shank body and hence to the legs, said dove-tailed connection of the retaining plate and the shank body preventing relative lateral movement of the lower portion of the retaining plate and the integral leg in any direction.

1'7. A combination bit shank as claimed in claim 16, a journal plate having a dove-tailed connection with the lower portion of the retaining plate and forming the means for mounting one end of the axle pin.

' 18. A combination bit shank comprising a shank body having a first leg formed integral therewith on one side, a guide structure on the other side extending longitudinally of said body, a holding plate having an interlocking means with the guide structure and connectible from,

the lower end of said body, the lower end of the holding plate forming a second leg, an axle pin having bits thereon, and means for mounting said axle pin between the two legs, the upper end of the holding plate and the upper end of the shank body being threaded and having a coupling structure threaded thereon, said coupling structure I being adapted for connection to a string of drill pipe, said coupling structure forming the sole means for preventing removal of said holding plate downwardly on the shank, and said coupling structure and the interconnection of the holding plate and the guide structure preventing relative lateral displacement in any direction of the legs relative to each other.

19. In a disk bit, the combination of a shank having one leg formed integral therewith and the other leg formed as part of a disconnectible side plate, said side plate being longitudinally slidably assembled on the shank and connected to the shank by means for rotating the shank, said rotating means restraining the side plate from longitudinal removal from the shank, anaxle pin having one end rotatably mounted in the integral leg and the other non-rotatably mounted in the removable plate and leg, said pin having a pair of cylindrical sections eccentric one to the other and a disk rotatably mountedon each eccentric section.

body having one leg formed integral therewith, a removable plate havinga longitudinally slidable and interlocking connection with the'shank body,

the lower part of said plate forming a second-leg, said plate being connected tothe shank body to restrain its longitudinal removal by a meansfor rotating said shank body, a retaining means mounted in the lower part of the removable leg, an axle'pin having one end rotatably mounted in the integral leg and the other end non-rotatably mounted in said retaining .means, said pin having cylindrical eccentric sections, each with a central collar, bushings on said sections, and a disk mounted on each bushing, means bearing against a collar for retaining each disk adjacent one of the legs, and said means retaining the disks spaced from its adjacent collar.

21. A combination bit shank having a shank structure witha plurality of legs,,one of said legs being removable for assembling and disa sembling a bit, a bit secured between said legs, an attaching and rotating means for attaching the removable leg to the remaining'portion of the shank and for rotating the bit shank with the legs and the bit, and in addition a securing means independent of the attaching and rotating means to attachthelower part of the legs together to restrain relative lateral movement in any direction of the lower portion of the legs one in relation to the other.

' 22. A combination bit shank comprising a shank structure having a plurality of legs with a bit secured between the legs, one of the legs being connectible and disconnectible for assembling and disassembling the bit, a connecting means to a stringfofdrillpipe forming asecuring means for the removable leg to the shank, and means in additionalnd independent of said connecting means toa'ttachthe lower part of the legs together to restrain relative lateral movement in any direction of the legs one in relation to the other adjacent the portion securing the bit.

23. A combination bit shank comprising a shank structure formed of a plurality of parts, such parts being'l'ongitudinally slidable for assembly in the direction of the axes of the shank when drilling in reference to each other and being connectibleland disconectible by such longitudinal sliding movement, a cutting bit secured to said parts and supported thereby, and means for attaching said parts together comprising a connection from said shank to a string of drill pipe.

EARL E. MILLICAN.

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