Патент USA US2109909код для вставки
March 1, 1938. 2,109,909 J. B. RAGSDALE ‘ROLLER CUTTER~ MOUNTING Filed June '2, 1936 MG w”?2” v ‘I?, g / , w/O 0, //4. . #1Lw zw yw v5 . / w . [12/6 9270/67 2.. 1 2,109,909 ‘I Patented‘ Mar. 1,? 1938 I UNITED ‘ STATES. ‘ PATENT OFFICE " 2,109,909 ‘r e ‘ ROLLER corms MOUNTING John B. Ragsdaie, Whittier, CaliL, assignm- to Globe Oil Tools Company, Los Nietos, OaliL, a corporation of Callfo Application June 2, 1936, Serial No. 83,054 15 Claims. This invention relates to well drilling tools and relates more particularly to well drilling tools embodying roller cuttersii; A general object of this invention is to provide ‘a strong, effective and particularly dependable mounting for a roller cutter of a well drilling tool. , When a removable shaft or pin is employed as a support for a roller cutter of a well drilling and application of the invention, throughout which description reference is made to the ac companying drawing, in which: . Fig. 1 is a vertical detailed sectional view of the lower portion of a typical well core drill 5 embodying cutters rotatably supported by the mounting means of the invention. Fig._ 2 is a fragmentary side elevation of the bit taken as indicated by line 2-2 on Fig. 1 and Fig. 3 is a fragmentary vertical ‘detailed sectional view of 10 tool the pin must be very securely locked or held lo in place to prevent its loss and the loss of the cutter. The threading ‘of such a cutter sup \ one of the cutter assemblies and mountings illus-. porting pin in a particular direct-ionso that ro trating the shape or condition of the pin prior tation of the cutter tends to tighten the threads to being locked in place. _ , has been found to be insui‘?cient to prevent the The improved cutter mounting of the present 15 loss of the cutter and pin. In instances where invention may be embodied in well drilling tools 15 _ I the pin is not securely locked against rotation of various types‘ and constructions and may be the torque on the pin resulting from rotation of employed in roller well bits as well as roller well the cutter sometimes tightens the‘ threads to the core drills. In the following detailed disclosure extent that they ‘shear or become distorted and I will describe .a typical form of the invention do not hold securely. The vibration stresses set embodied in a more or less typical form of well up in a cutter supporting pin are very great and core drill, it being understood that the invention. often cause the pin to unthread and become lost is not to be construed as limited or restricted to even though it is threaded in to be tightened by the speci?c form or application about to be the torque resulting from rotation of the cutter. described. _ Another object of this invention is to provide 25 The core drill illustrated in the drawing in a mounting for a'roller cutter of a well drilling cludes a shoe or body In threaded‘ to the lower tool which mounting embodies a threaded cutter end of a core barrelB. The body I0 is tubular supporting pin positively locked against rotation having'a central longitudinal opening‘ H for re so that itcannot become lostfstrained, stripped ceiving the core and admitting itto the barrel 30 or loosened during operation of the tool in the B. Circumferentially spaced recesses l2 occur 30 in the lower end of the tubular body II] to receive Another object of thisinvention is to- provide cutters C. In the portion of the bit shown there a mounting for a rotatable roller cutter includ- ' are two similar recesses l2, both receiving inner ing' a threaded pin supporting the cutter and roller cutters C for forming the inner portion of 35 very simple yet dependable means for locking the bore and for trimming the core. It is to 35 - the pin against rotation in either direction so beunderstood that the shoe or body H) has other that its threads cannot be strained or sheared recesses for receiving‘ outer cutters and that the ‘and so that the pin vcannot become unthreaded._ improved mounting of the present invention may Another object ‘of this invention is to provide be employed to support such outer cutters ‘as 40 a roller cutter mounting embodying a threaded-in well as the particular inner cutters C illustrated. 40v ' cutter supporting pin and means for positively In the bit or core drill structure illustrated holding the pin against rotation in both direc the inner and outer walls l3 and I3“, respectively, tions, which means does not necessitate the addi- ' of the recesses l2 are inclined downwardly and _ ' tion or employment of set screws, lock pins, cot inwardly with respect to the central vertical 45 ter keys or similar‘ parts‘that may become lost axis of the tool. A projecting boss I4 is provided 45 or displaced. ' well. ' , 7 A further object of this invention is "to provide . a cutter mounting of the character mentioned that is simple and inexpensive and in which the inclusion of the means for locking the pin against rotation does not'materially add to the cost or size of the mounting. A The various objects and features of‘ my inven tion will be fully understood from the following detailed description of a typical preferred form i on the inner wall l3 of each recess l2 and pre- sents a downwardly and inwardly inclined sur face l5 substantially parallel with the opposing outer recess wall l3. The portions of the body III at or de?ning the outer walls of the recesses 50 [2 may be termed legs L while the portion of the body It! at the inner sides of the recesses I! may be termed a body wall W. The lower outer cor ners of the legs L are rounded or bevelled as il lustrated in the drawing. A ?at downwardly 55 2 2,100,909 facing shoulder 15 is provided on each leg L at municate with the outer end of the opening 34. the lower end of ,its.wall l3‘. A similar down wardly facing ?at shoulder I1 is provided at the lower end or face of each boss 14. Passages or ports l8 extend downwardly through the body The notch 31 may be in the form of a vertical or longitudinally extending groove in the outer side of the leg L. When the notch 31 is of this con?guration its lower end is in communication l3 to discharge the circulation ?uid into the re with the opening 34. cesses l2. The means 26 includes an extension, tab or lug 38 on the head 32 cooperating with the notch 1 The roller cutters C are substantially cylindri cal and are each provided with a central 1on gitudinal opening 19. A socket or counterbore‘ 23 is provided in each cutter C at the inner end of , 31. In accordance with the invention the lug 33 is an integral part of the head 32. The ing 33 is formed or provided by hammering or peening its opening 19. The outer ends of the cutters C over an edge portion of the head 32. This form may be ?at and normal. Suitable cutting teeth ing or providing of the lug 38 is, of course, per 2| are provided in the peripheries of the cutters _ formed subsequent to the insertion and mount 15 C to act on the earth formation. I The mounting means of the present invention for supporting or mounting the two cutters C of the typical bit illustrated may be identical and I will proceed with a detailed description equally 20 applicable to both mountings. ' The cutter mounting of the present inven-v tion includes, generally, a threaded shaft or pin 25, means 28 for securing the pin 25 against ro tation, a suitable anti-friction bearing 21 rotat '25 ably supporting the cutter C on the pin 25 and‘ non-rotatable washers 23 and 23 on the pin 25 at opposite ends of the cutter C. Thercutter supporting-pin 25 in addition to supporting the roller cutter C connects or ties to 30 gether the leg L and the body wall W de?ning the recess 12. The pin 25 has a major cylindrical bearing portion 33 which extends through the cutter opening 13, a ‘threaded end portion 3| and a. head 32. Aligned openings 33 and 34 are provided in the wall W and the leg L to carry the cutter supporting pin 25. In ‘the particular drill structure illustrated the openings 33 and 34 are. inclined downwardly and outwardly with respect to the vertical axis of the tool being substantial 40 ‘ly normal to the walls vl3 and I3. and the sur face l5. In accordance with the invention the ing of the cutter C, the pin 25 and the other ele ments of the cutter assembly. As illustrated in Fig. 3 of the drawing, the pin head 32 is pro portioned to project some distance beyond the outer surface of the leg L when the pin 25 is fully, threaded in place. The lug 38 is readily formed 20 or provided by striking or hammering the pro jecting portion of the head 32 to distort it into the notch 31. The depression 53 is provided to facilitate the ready forming or peeningover of > the lug 38. The lug 33 rather closely ?ts the lower 25 portion of the notch 31 so that there is no play or possibility of movement of the pin 33 in either direction about its axis. The forming or peen ing of theilug 33 as just described removes or eliminates the projection portion of the head 32 30 so that the upper outer portion of the head 32 may be substantially ?ush with the outer surface of the leg L. In accordance with the broader principles of the invention any suitable form of anti-friction 35 bearing means may be provided for supporting the cutter C on the pin 25. In the typical case illustrated in the drawing the anti-friction bear ing 21 comprises amultiplicity of rollers 33 in the opening I 9 of the cutter C, the rollers 39 of course bear on the major portion 33-.of the pin 25 to sup- ' cutter supporting pin 25 is passed inwardly port the cutter C for free rotation on the pin. through the openings 34 to have its portion 3| The outer ends of the rollers 38 occur at or adjae cent the outer end of the cutter C and the inner. threaded in the opening 33. The threaded por ends of the rollers'33 occur at or adjacent the 45 tion 3| of the pin 25 is preferably of less diameter 45 than the major portion 33 to provide the pin with bottom wall of the counterbore 23. The washers 28 and 23 surround the pin 25 at an annular inwardly facing shoulder 35. The shoulder 35 is spaced outwardly some distance the opposite ends of the cutter C to receive the _ from the surface l5 of the boss l4 to leave a space end thrusts from the cutter and to prevent the wearing of the body l3 due‘to rotation of the 50 50 for receiving the washer 23 to be hereinafter de scribed. The portion 3l of the pin 25 may be cutter. The washer 23 ?ts in or is received in the counterbore 23 to have suitable clearance'with its threaded through the entire length of the open ing 33 and the inner extremity of thepin 25 is peripheral wall and to bear on or cooperate with ground or cut away to be- flush with the wall of its bottom wall. The washer 23 bears against the surface I5‘ of the boss 14 for the transmission 55 55 the opening II. The head 32 of the pin 25 is re ceived in- the opening _34, the opening 34 being of end thrusts to the body, l3. In accordance enlarged or provided with a counterbore to prop A polygonal wrench» ‘ receiving socket 35 is provided in the head 32 to facilitate theturning or threading of the pin 25. The head 32 may be cylindrical in its general con ?guration to conform-to the opening 34. In the preferred construction a depression 53 is provided in .the outer end of the head 32. The depression erly receive. the head 32. 65 53 preferably occupies a substantial portion of the outer end of the head 32. ' > The means 23 for holding the pin 25 against rotation is an important feature ‘of the invention. The means 25 operates to de?nitely secure the 70 pin 25 against rotation in both directions and thus prevent, unthreading of the pin or straining and shearing of its thread. The means 25 includes or provides a notch 31 in the body [3. Where the pin 25 is inserted inwardly through the open- with the invention the washer 23 has an extension or lug 43 projecting inwardly toward the central axis of the tool. The lug 43 cooperates with the shoulder 11 to hold the washer 23 against rota 60 tion. The annular shoulder 35 of the pin 25 may engage the inner side of the washer 23 whereby the washer is clamped between the shoulder 35 and the surface l5 of the boss l4. It will -be noted that the counterbore 23 of the 65 cutter C receives the washer 23 and its lug 43_ so that the washer cannot engage the core. The socket or counterbore 23 has a depth greater than the width of the washer 23 so that it re ceives a portion of the boss l4. thereby allowing 70 the wall W, or the wall W and its boss l4, to have ample stock or wall thickness for the thread ed end portion 3| of the pin 25 without thicken ing the entire body wall W. 75 75 ing 34 the notch 31 is preferably located to com- ‘ The washer 23 has ?at opposite faces or sides 2,109,909 for cooperating with the outer end of the cutter C and for bearing on the outer wall l3‘ 0! the re cess l2. ,The washer 29 is provided with an ex tension or lug 4| projecting outwardly at its low er portion to cooperate with the shoulder l6. The cooperation of the lug 46 with the shoulder l6 positively holds the, washer 29 against rota tion. It‘will be observed that the washers 28 and 29 formed and mounted as just described '10 limit the end movement or play of the rollers 39. v The improved cutter mounting of the present invention is strong and dependable and may be embodied in a well tool without necessitating the addition of heavy body walls, cotter .keys, 15 set screws or similar parts. The lug 38‘ may be - easily and quickly formed following. the assem bly'of the parts and its provision does not add to the cost of the mounting. The lug 38 being hammered or peened into the notch 31 closely 20 ?ts the notch to positively prevent turning of - 3 opening and a shoulder atone end of the open ing, a threaded pin carried in'the opening, a head on the pin,'a peened-overllug on the head cooperating with the shoulder to hold the pin against rotation, and a rotatable cutter carried by the pin. ' 6. In a well drilling tool, a body having an opening and a preformed'notch'at an end of the opening, a threaded pin extending through the opening,~a part of the pin peened into the, notch 10 to hold the pin against rotation, and a rotatable cutter carried by the pin. 7. In a‘ well drilling tool, a body having an opening and a preformed notch at an end or the opening, a threaded pin extending through the opening, a head on the pin, a part on the head peened into the notch to hold the pin against turning, and a rotatable cutter carried by the pin. ' 8._ Ina well drilling tool, a body having a re 20 the pin 25 in both directions and to prevent all cess and aligned openings joining the recess, a rotary movement of the pin. The pin'25 may be ‘pin inserted-through one opening and having properly tightened in prior‘ to the forming of the lug 38 to form a strong link or connecting tie _ an end portion threaded in .the other opening and a head on its other end cooperating with 25 between the body wall W and the leg L. Follow ing this tightening in of the screw 25 the form-7 ing of the lug 38 by peening or hammering locks the pin in its tightened in position. ‘Thus the lug 38 looks the cutter supporting pin 25 against 30 rotation in both directions to prevent unthread ing of the pin, straining or shearing of the' the body whereby the pin ties together the body 25 portions at opposite sides of the recess, a part on the pin peened over to cooperate with the body to prevent turning of the pin. . 9. In a well drilling tool, a body having a re cess, aligned openings joining the recess and a 30 threads of the pin and the opening 33 by'torque ' preformed notch at the outer end of one of the on the pin and prevents loosening of the pin so that it continues to form ‘a connecting tie be 35 tween the leg L and the wall W. The pin 25 does not become loosened or displaced during the operation of the tool and the cutter C, the wash ers 28 and 29, and the rollers 39 are de?nitely held against loss in the well. ' Having described only atypical preferred form 40 . and application of my invention I do not wish - to be limited or restricted to the speci?c details herein set forth, but wish to reserve to myself any variations or modi?cations that may fall 45 within the scope of the following’ claims. . Having described my invention, I claim: 1. In a well drilling tool, a body having a recess and aligned openings joining the recess, a pin inserted through one opening and threaded in 50 the other opening to extend through the recess, a rotatable cutter carried by the pin, and means holding the pin against turning comprisingv a peened-over part on the pin cooperating with the body. 55 ' ’ 2. In a well drilling tool, abody having a recess and an opening joining the recess, a threaded pin carried. in the opening and extending into the recess, a rotatable cutter in the recess, carried by the pin, and apeened-over part on the pin 60 cooperating with the body to hold the pin against rotation. , 3. In a well‘ drilling tool, a body having‘a recess, an opening joining the recess, and a preformed notch, a pin threaded in the opening and extend ing through the recess, an extension on the pin cooperating with the notch to hold the pin against rotation, and a cutter in the recess rotatable on the pin. 4. In a well drilling tool, a body having an 70 opening and a shoulder at one end of the open , ing. a threaded pin carried in the opening, an integral peened-over part on the pin cooperating with the shoulder to hold the pin against rota— tion, and a rotatable cutter carried by the pin. 75 5. In a well drilling tool, a body having an openings, a pin entered through the said open ing and threaded in the other opening, a head on the pin cooperating with the body whereby the pin, ties together the portions of the body at 35 opposite sides of the recess, a part on the head vpeened in the notch to hold the pin against rota tion, and a cutter in the recess rotatably carried by the pin. ' 10.» In a well drilling tool, a body having a re 40 cess, aligned openings joining the recess, and a preformed notch at the outer end of one of the openings, a pin entered through the said opening and threaded in the other opening, a head on the pin cooperating with the body whereby the pin 45 ties together ‘the portions of the body at oppoe site sides of the recess, a part on the head peened in the notch to hold the pin against rotation, a rotatable cutter ‘on the pin within the recess,, wa whers on the pin at opposite ends of the cutter, 50 and lugs on the washers cooperating with-the body to hold the washers against rotation. _ 11. In a well drill, a tubular body having a recess in its wall open at its lower end, a trans verse opening intersecting the recess, and a pre 55 formed notch at the outer end of the opening, a ‘pin passed inwardly through the opening and threaded in the opening at the inner side of the recess, a head. on the outer" end of the pin co operating with the body whereby the pin ties to to gether the portions of the body at ‘the inner and , outer sides of the recess, a lug on the head cooperating with the notch to hold the pin against rotation, ‘and a rotatable cutter in the recess carried by the pin. 65 I 12. In a well drilling tool, a body having an opening and a notch at- an end of the opening, a threaded pin extending through the opening, a head on the pin having a depression at its outer end, a part on the head peened into the notch to 70 hold the pin against turning, and a rotatable cutter carried by the pin.- . . ' 13. In a well bit, a support having an opening, a cutter carrying pin having a portion received 75 4- r, 2,109,909 in the opening, and a part on the pin peened into a part of the opening to lock the pin against loss. 15. a. well drilling tool. two parts, one a body ‘ having an opening, theother a threaded pin in I portion of the opening to prevent unthreading of the pin against unthreading. 14. In a well bit, a support having an opening, the opening, a cutter supported by the pin, rind»v a. cutter carrying screw received in the opening, a peened-over portion on one of said parts co; parts to hold *5 and a part on the screw peened into an enlarged , operating with the other of the screw. ‘ ‘ . JOHN B. RAGSDALE.