Патент USA US2123453код для вставки
July 12, 1938." ` ‘_ 'AV Q_ CATLAND ET AL _ CORE DRILL CONSTRUCTION Filed Aug. >l1, 1957 ll // u ' 25,123,453 Patented July 12, 1938 2,123,453 UNITED STATES PATENT CFFICE CORE DRILL oous'rnuo'rloriI Alfred C. Catland, Alhambra, and Philip C. Efromson, Whittier, Calif., assignors to Globe Oil Tools Company, Los Nietos, Calif., a cor poration of California Application Aúgust 11, 1937, serial No.`15s,514 ’ 15 claims. This invention relates to well tools and relates more particularly to a core drill for use in> the rotary method of well drilling. A general object of this invention is to provide 'a simplified, de 5 pendable and improved bit head construction for Fig'. 6. - practical, effective, anti-friction bearing 'means for mounting the roller cutters of a well core drill. embodied in a core drill of the general character Another object ofÍ this invention is to provide a well core drill construction of the character mentioned in which the roller cutters are sup ported entirely by balls to rotate with a mini mum of friction. l i Another object of this invention is to provide a core drill construction of the character men tioned in which the several parts of the cutter mountings are securely and dependably fixed to the head or body of the bit. Anotherobject of this invention is to provide 20 a core drill construction vof the character men tioned in which the assembly of a cutter, its sup porting pin and its several bearing elements are held against separation prior to being assembled 25 on the bit head whereby the cutter assembly may be shipped, stored, handled and installed as a unit. Another object of this invention is to provide a core drill construction of the character men 30 tioned embodying novel means for securing the ends of the cutter bearing assemblies to the bitv head. A further object of this invention is to provide a ball bearing mounting for the roller cutter of 35 a well tool in which the‘cutter is supported by spaced rows of balls, both of which assume theend thrusts in both directions 4as well as -the Y side elevation of the sectional bushing of theA 4bearing means for one of the inner cutters, and Fig. 7 is an end'vlew of the bushing shown in The improved construction of the present in vention may be embodied in core drills varying considerably in character. In the following de tailed description we will describe the invention a core drill of the character mentioned. . Another- object of this invention is to provide a 10 (ci. 25a-72) radial thrusts. ` The various objects and features. of our inven 40 tion will be fully understood from the following detailed description of a typical preferred form and application of the invention, throughout ' which description reference is made to the ac companying drawing, in which: » Fig. 1 isa central longitudinal detailed sectional 45 view` of the lower portion ofl a core drill embody ing the present invention. Fig. 2 is a bottom view of the drill showing the cutters in broken lines. Fig. 3 is an enlarged fragmentary vertical 50 detailed sectional view illustrating one of the outer cutters and its mounting. Fig. 4 is aview similar to Fig. 3 showing one of the inner cut ters and its mounting. Fig. 5v is a reduced side l elevation of the C-washer of the bearing means» 55 for one of the inner cutters. Fig. 6 is a reduced described and claimed in the copending applica l-10 tion Serial No. 95,513, filed by Alfred C. Catland on August 12, 1936, for “Core drill”, which has matured into Patent No. 2,093,633 granted Sept. 21, 1937. It is to be understood that the inven- tion is not to be construed as limited or restricted to the speciilc'form or application about to be described. ' The core drill illustrated in the drawing in cludes an outer barrel I0 to le connected with the lower end -of a rotary well drilling string. A bit head I I is threaded on the lower end of the barrel IIJ. The bit head II ‘is tubular having a central longitudinal opening I2 and the lower portion of the head II embodies certain features of the invention, as will be hereinafter described. 25 Spaced upwardly facing annular shoulders I3 and lli are provided in the head opening I2. The drill further includes an inner barrel I5 extend ing longitudinally through the outer barrel I0 and adapted to receive the core. A collar I6 is 30 ñxed on the lower end of the inner barrel I5 and is received between the shoulder I4 and a down wardly-facing shoulder I1 on the interior of the outer 'barrel - I0~ ‘to rotatably support lthe inner barrel I5' in the outer barrel. The inner barrel 35 I5 is spaced from the interior of the outer- barrel I0 to leave an annular ñuid passage I8’ for con ducting the circulation‘fluid downwardly. Ports I9.are provided in the collar I6 to conduct the circulation ñuid from the passage I8 to ports 20 40 in the head II.‘ The ports 20 discharge the circulation ñuld to the cutters of the drill, aswill be subsequently described. A core catcher 2l is arranged in the' head II to trap `and retain ' the core. The core catcher 2I is an annular 45 member or assembly and includes a plurality of circumferentially spaced spring urged dogs 22 projecting inwardly to bite into the core.4 The core catcher 2l is arranged between the shoulder I3 and a downwardly facing shoulder 23 in the 50 collar I6. In accordance with the invention the lower -portion of the head II is formed to receive the cutters and their mounting means. Spaced re cesses 24 and 25 extend upwardly in the Wall of 55 2,123,453 the tubular head II from its lower end. The inner and outer sides of the recesses 24 slope downwardly and inwardly with respect to the central longitudinal axis of the drill.l A tapered boss 26 is provided on the inner wall of each re cess 24 to increase the thickness of the inner wall portion of the head `Il adjacent the recesses. Notches 21 extend upwardly from the lower end of the head Il in the inner wa‘ll portion of the 10 head to connector join the recesses 24 with the head opening I2. The notches 21 have ñat sub stantially vertical side walls. Similar flat walled notches 28 are provided in the outer wall por tions of the head Il and join or communicate 15 with the recesses 24. The upper walls of the notches 21 and 28 are inclined downwardly and vertical axis of the drill is flat and pitched with respect to the axis of the pin. The pin 36 passes through the opening 32 of the cutter A and is considerably longer than the cutter. The bushing 31 is assembled on the pin 36 and extends through the cutter opening 32 'to project `xieyond the opposite ends of the cutter. In ac cordance with the invention the bushing 31 is ‘ sectionaland comprises an inner section 40, a central section 4I and an outer section 42. The 10 bushing sections 40, 4I and 42 are tubular and surround the pin 36. -The bushing sections 40, 4I and 42 are generally cylindrical and may be of the same diameter. The several sections of the bushing 31 are arranged in end to end rela 15 tion and the bushing is of the same length as outwardly with respect to the central vertical the pin 36. The end of the section 40 at the axis of the drill and the notches 21 and 28 are inner end of the pin 36 is fiat and has the same radially aligned with respect `to said axis. The inclination as the end of the pin. The bushing section 42 has its outer end in the same plane 20 20 recesses 25 are spaced between the spaced re cesses 24 and their inner and outer walls are as the outer end of the pin 36. The inner bush ing section 40 has two flat parallel side faces 43 flat and inclined downwardly and outwardly rel ative to the vertical axis of the drill. A tapered extending inwardly from its inclined end. The boss 29 is provided on the outer wall of each outer bushing section 42 has two similar ñat 25 recess 25 to increase the outer' wall portion of side faces 44 extending inwardly from its fiat 25 the head II at the recesses. Notches 38 extend outer end. The sections 40, 4| and 42 of the _ upwardly from the bottom of the head I I in said- bushing 31 are arranged in abutting relation and outer wall portions of the head and join the in the preferred construction tapered bosses 45 recesses 25. The side walls of the notches 3D are are provided on the ends of the central section 30 flat and substantially vertical. Notches 3I are 4I and are received in sockets in the inner ends 30 provided in the inner wall portions of the head of the sections 40 and 42. v It is an important feature of the invention that. II and connect the recesses 25 with the head> the sectional bushing 31 is secured or retained opening I2. The notches 3l have flat substan tially vertical walls and the notches 30 and 3l on the pin 36 against displacement therefrom whereby the cutter A and' its bearing means 35 35 are substantially\radially aligned. The upper may be handled, shipped and installed as a unit. walls of the notches 30 and 3| are inclined down .wardly and inwardly with respect to the central The inner and outer ends of the pin 36 are peened over or riveted over at 46 and 41 respectively to vertical axis of the drill. > The improved core drill construction of the cooperatewith the contiguous ends of the bush 40 present invention includes, generally, inner roller ing sections 40 and 42, respectively.' If desired, 40 cutters A, bearing means for rotatably mounting the outer ends of the bushing sections 4|) and 42 the cutters A in the recesses 24, outer roller may be Aslightly counter-bored to receive the riv cutters B and bearing means for rotatably eted over parts 46 _and 41. 'The peened over or mounting the cutters B in the recesses 25. We riveted over end parts 46 and 41 of the pin 36 will first proceed with a detailed description of cooperate with the bushing sections 40 and 42 .45 to maintain the assembly of the several bushing one of the cutters A and its bearing means. sections in proper end to end relation on the The cutters -A are provided to assist in mak ing an annular cut in the earth formation at the pin 36. 'I'he bushing 31 is- provided with races to op bottom‘of the well boreand serve to trim the 50 core for reception in the head opening I2. The pose the races 35 on the interior of the cutter A. 50 'I‘he outermost corner of the inner bushing sec several cutters A may be identical and the follow ing description is equally applicable to all of tion 40 and the abutting comer of the central bushing section 4I have annular grooves which the cutters A. The cutter A has a central longi tudinal opening 32 and the ends _of the cutter A register to form a ball race 48. The ball race 55 are preferably fiat. Thecutter A is cylindrical 48 is partially cylindrical in cross section and 55 and is provided with suitable peripheral cutting directly opposes -one of the races 35. The cor parts or teeth 33. A central tapered socket 34 is ners of the sections 4I and 42 at their abutting provided in the inner end of the cutter A. In ends are provided with annular grooves which accordance with the invention axially spaced ball 60 races are provided in the wall of the cutter opening 32. In the preferred construction illus trated there are two spaced ball races 35 in the wall of the cutter opening 32.- The races 35 are partially` circular in cross section and are- of substantial depth. v register to form a ball race 49. The ball race 43 is partially cylindrical 'in cross section and , 60 directly opposes the other race 35 on the interior of the cutter A. The balls 38 rotatably mount or support the cutter A on the sectional bushing 31. The balls 38 are arranged in the pairs or sets of opposing 65 .The bearing means for.`rotatably«supporting -races 35'and 48 „and 35 and 43. The races 35 the inner cutters A each includes, generally, a pin 36, a sectional bushing 31 on the pin 36 and series of balls 38 cooperating with the races 35 and the bushing 31 to rotatably support the cut and 48 and 35 and 49 are shaped to accurately conform to thevballs 38 whereby the load ca pacity of the bearing is increased. Owing to the depth of the races 35, 48 and 4l, the rows or 70 ter A. series of balls 38 assume the end thrusts in both directions, as well as the radial thrusts. Thus ' The bearing pin 36 may be a lsimple cylindrical member, as illustrated. The pin 36 is preferably . uniform in diameter throughout its length. The 75 inner end of the pin 36 relative to the central the cutter A is supported solely or entirely by the balls 38. A notch 50 is provided in the central bushing section .4I and communicates with the, 3 2, 128,458 race 48 to facilitate the insertion of the balls 38 ing 56. A tapered socket 51 is provided in the in the opposing race 35. outer end of each cutter B to receive a boss 29. In accordance with the invention spaced ball ' ' - In assembling the cutter A and its bearing a series of balls 38 may be arranged in the outer most race 35 and the bushing sections 4I and 42 inserted in the cutter opening 32 from its oppo site ends whereby the balls are properly retained in the races 49 vand 35. The balls 38 are then races 58 are provided in the cutters B. In prac-tice there may be two spaced ball races 58 pro vided in the wall of each cutter opening 56. The races 58 are partially circular in cross section and are of substantial depth. successively inserted through4 the notch 58 into _ The bearing means for rotatably supporting 10 the other race 35 and when the required number the outer cutters B are very similar to the means of balls has been arranged in place the bushing for supporting the inner cutters A. We will pro section 40 is inserted ln the cutter opening 32 to' ceed with a description of the bearing means for complete the race 48._ 'I'he end parts 46 and 41 >supporting one of thevouter cutters B. it being of the pin 36 may then be peened over or riv understood that such description is equally ap 15 eted over to secure the bushing sections 48, 4I t plicable to the bearing means of the other cut and 42 against endwise movement- and separation. ters B. , The balls 38 cooperating with the opposing races The means for rotatably supporting an outer 35 and 48, and 35l and 49, hold the cutter A cutter B includesa pin 66, a sectional bushing 6| against longitudinal movement and the end parts on the pin and balls 62 cooperating withthe races 46 and 4-1 of _the pin‘36 hold the bushing 31 58 and the bushing 6 I. The pin 68 is preferably a 420 Aagainst displacement from the pin. Thus the simple; cylindrical member of uniform diameter. several parts of the assembly are secured against The ends of the pin 68 are flat and the outer end separation whereby the assembly may be readily >of the pin is pitched to be substantially vertical handled as a unit. when the cutter assembly is in place on the head 25 vThe invention provides simple yet very de II. The inner end of the pin 68 is pitched to be penda-ble means for securing the bearing of the inclined downwardly and outwardly when the cutter A to the head II. The assembly of the cutter assembly is secured in place on the head I I. The bushing 6I is sectional and comprises an cutter A and its bearing assembled in the form of a unit, as described' above, is moved upwardly . outer section 63, a central section 64 and an in 30 relative to the head II to enter the cutter A in ner section 65. The sections 63, 64 and 65 are i30 one of the recesses 24. When the cutter is thus tubular and surround the pin 68. The sections entered in the recess v24 the projecting portion 63, 64 andY 65 are generally cylindrical and of of the bushing section 42 is received in the notch uniform diameter. The outer end of thesection 28 and the projecting portion of `the bushing sec 63 is pitched to lie in the same plane as the outer 35 tion 48 is received\in the notch 121. The ñat sur end of the pin 6I). The section 64 has its exposed faces 34 and 44 may shiftably or slidably engage end pitched to lie in the same plane as the inner the fiat side walls of the notches 21 and 28. The end of the pin 60. The sections of the bushing cutter assembly or unit is moved upwardly to. 6I are arranged in abutting end to end relation. bring the bushing sections 48 and 42 against the In accordance .with the invention the sectional inclined upper walls of the notches 21 and 28. bushing 6I is locked or retained on the pin 68 i The cutter assembly is then moved inwardly so . whereby the cutter and bushing assembly may be that the socket 34 receives the boss 26. A wash handled-A as a unit. The pin 6I) has end parts 6I]a er 5I is provided to occupy-the space between and Bub'peened over or riveted over to engage the the outer end of the cutter A and the adjacent exposed ends of the bushing sections 63 and 65, 45 wall of the recess 24. The washer 5I is in the na ï respectively. The riveted over parts 60ß and 68h ture of a C-washer so that it may be readily of the pin 60 prevent endwise displacement of the passed upwardly over the bushing section 42. lbushing 6I from the pin. The sectional bushing 6I is longer than the cutter B and the projecting s When the cutter assembly and the washer 5I are in place the unoccupied portions of the. notches portions of the sections 63 and 65 are received in the notches 38 and 3I.~ The bushing sections 63 50 21 and 28 are ñlled with welds 52 and 53, respec tively. The weld 52 securely connects the pin 36 and 65 preferably have flat side surfaces for and the section 40 to the inner wall portion of cooperating with the side walls of the notches 38 . ~ the head II while the weld 53 rigidly secures the and 3l. Registering grooves are provided in the cor C-washer 5I, the bushing section 42 and the pin 36 to the outer wall portion of the head II. The ners of the abutting ends of the sections 63 and ¿ welds 52 and 53 may be ground or machined oil’ ' 64 to form an annular ball race 66. 'I'he ball race smooth with the adjacent surfaces of the'head I I. 66 directly opposes one of the races 58 in the cut ter B. The corners of the abutting ends of the 'I'he bushing sections 40 and 42 engage upward ly against inclined upper walls of the notches sections 64 and 65 have registering grooves which 60 21 and 28 so .that the cutter»A secured to the form -an annular ball race 61 directly opposing head II, as just described, is rotatable about an the other ball race 58. 'I'he races 66 and 61 are ‘ axis inclined downwardly and outwardly relative partially circular in cross section and are of sub-f to the vertical axis of the drill. The cutter A is stantial. depth. The balls 62 are provided in the. ‘ sets or pairs of opposing races 58 and 66 and mounted to project downwardly beyond the low 65 er end‘of the headV II and to project inwardly 58 and 61 and serve to rotatably support the cut Á65 somewhat at the lower end of the opening I2 to «ter B on the sectional bushing 6I. The opposing assist in making the annular cut in the earth races are of such depth that the balls 62 transmit ` the end thrusts in both directions as well as the formation and to trim the core for reception in the- drill. 70 ' ' radial thrusts. A notch 18 is preferablyv provided in the section 64 to facilitate the assembly of the 70 , The outer cutters B are provided to cut the well bore to gauge. The cutters B'are frusta-conical having tapered or pitched peripheries. Suitable cutting teeth 55 are provided on the frusta-coni cal cutters B. The cutters B. have ñat ends and 7,5 each is_ provided with a central longitudinal open balls 62 in the adjacent race »58. v y , . When the cutter B is to be assembled on the head II the cutter-unit or the assembly of the cutter and its bearing is moved upwardly relative to the head II to enter the cutter B in a recess 4 2,123,453 2l and to enter the protruding flat sided portions parts on the pin holding the bushing against dis oi' the bushing sections 63 and 65 in the notches placement from the pin. 4. In a well drilling tool, an assembly adapted 3l and 3l, respectively. The cutter assembly is then moved outwardly to a position where the boss 2l is properly received in the recess 54. It is to be understood that the cutter B has proper clearance with the boss 29 and the walls of the recess 25 when in the iinal position. 'I'he pro truding portions of the bushing sections 63 and Il are engaged against the inclined upper walls of the notches 30 and Il. A c-washer B9 is provided to occupy the spacebetween the inner end of the cutter B and the inner wall of the recess 25. The 4ß-washer 89 is readily passed upwardly to be handled as a unit comprising a cutter hav ing an opening, a pin passing through the open ing, a sectional bushing on the pin, there being opposing ball races in the bushing and the inte rior of the cutter, balls cooperating with races to rotatably support- the4 cutter, the races being of such depth that the balls transmit end thrusts 10 between the bushing and cutter, and riveted over parts on the pin holding the bushing against displacement from the pin. 5. In a well drilling tool, an assembly adapted around the bushing section 65 to engage against to be handled as a unit comprising a cutter hav-‘- the wall of the recess 25 and to have proper clear- - ing an opening, a pin passing through the open ance with the cutter B. When the cutter assem ing, a sectional bushing on the pin, there being bly is in its proper position the unoccupied por tions of the notches 30 and 3i are iilled with welds 'Il and 1|, respectively. The weld 10 rigidly se cures or bonds the bushing section 63 and the pin l0 with the outer wall portion of the head I l while the weld 1I ilxes the washer 69, the bushing section I8 and the pin I0 to the inner wall por opposing ball races in the bushing and the in terior of the cutter, balls cooperating with the races to rotatably support the cutter, and end 20 parts on the pin riveted over against the‘ends of the bushing. tion o! the head Il. `The welds ‘I0 and 1I may be finished to be iiush with the adjacent surfaces of 6. A well drilling tool comprising a body, a cutter having an opening, a ball bearing in the opening rotatably supporting the cutter and as 25 suming end thrusts from the cutter in both di the head Il. rections, and welding securing the bearing to » It is believed that the' utility and practica bility of the drill construction provided by this invention will be readily apparent from the foregoing detailed description. The cutters A and B are supported entirely by the sets or series of balls 38 and 62 to rotate with a minimum of friction. The bearing vassemblies are securely welded in the notches of the head Il to posi tively prevent loss or displacement of the bear _ ing parts and cutters. The cutter and bearing assemblies may be assembled at the place of manufacture and constitute units that may be shipped, handled and installed with ease. These cutter and bearing assemblies may be properly. p assembled ~at the place of manufacture to accu rately tit the drill head Il.Having described only a typical preferred form and application of our invention, we do not wish to be limited or restricted to the speciñc details herein set forth, but wishA to reserve to our selves any variations or modifications that may appear to those skilled in the art or fall within the scope of the following claims: Having described our invention. we claim: 1. A cutter unit in a well drilling tool com ` prising„a cutter having an opening, a pin pass ing through the opening, a bushing on the pin, balls rotatably supporting the cutter on the bushing, and riveted over parts on the pin hold ing the bushing on thepin whereby the assembly the body. _ 7. A well drilling tool comprising a body, a cutter having an opening, a pin extending into 30 the opening, a bushing on the pin, balls rotat ably supporting the cutter on the bushing, and a Weld securing the pin to the body. 8. A well drilling tool comprising a body, a cutter having an opening, a pin extending into 35 the opening, a bushing on the pin, balls rotatably supporting ‘the cutter on the bushing, and a Weld securing the bushing to the body. 9. A well drilling tool comprising a body, a cutter having an opening, a pin extending into 40 the opening, a bushing on the pin, balls rotatably supporting the cutter on the bushing, and a weld securing the pin and bushing to the body. 10. A well drilling tool comprising a body hav ing spaced supports, a cutter between the sup 45 ports having an opening, a pin extending through the opening, a ball bearing on the pin rotatably supporting the cutter, and welds secur ing the bearing to the supports. 11. A well drilling tool comprising a body hav 50 ing spaced supports, a cutter between the sup ports having ’ an opening, a pin extending through the opening, a sectional bushing on the pin, balls cooperating with the bushing and the cutter rotatably supporting the cutter and trans 55 mitting the end thrusts between the cutter and bushing, and welds securing ¿the pins to the may be handled as a unit. 12. In a. well drill, spaced supports having 2. A cutter unit for a well drilling tool coxn- ’ openings, a cutter between the supports having 60 prising, a cutter having an opening, a pin pass an opening, a bearing extending through the ing through the opening, a bushing on the pin, balls rotatably supporting the cutter on the bushing and transmitting both the end thrusts and the radial thrusts between the bushing and cutter, and parts on the pin at the ends of the bushing peened over to hold the bushing on the opening in the cutter and having its end portions received in the first mentioned openings, balls rotatably supporting the cutter on the bearing, and welds securing the said bearing portions in 65 the said first mentioned openings. ' 13. In a well drill, spaced supports having notches, a cutter between the supports having Din. 3. In a well arming tool', an assembly adapœd--- an opening, a pin extending through the open -to‘be handled as a unit comprising a cutter ha ing, a bushing on the pin h'aving its end portions 70 ing an opening, a pin passing through the open received in the notches, the bushing and cutter ` ing, a sectional bushing on the pin, there being opening having opposed races, balls in the races opposing ball races in the bushing and the' inf rotatably supporting the cutter, and welding se terior of the cutter, balls cooperating with races- curing the said end portions of the bushing in 75 ' to rotatably support the cutter, and riveted over the notches. _ 1i. in e, wel! drill, spaced >supports having notches, o cutter between the _supports having an opening, a. pin extending through the opening, a bushing on the pin having its end portions re» ceived in the notches, the bushing and cutter opening having opposed races, balls in the races ceivedl in the notches, the bushing ond cutter opening having opposed races, balls in the races» rotatably supporting the cutter, a washer on the bushing between one of saidsupportsand the cutter, e weld in the notch of said support secur ing the washer and the adjacent end portions of rototably supporting the cutter, and Weids in the ’ the bushing and pin to said support, and n weld notches securing the end por-tions oi’ the pin and said end portions of the bushing to the supports. 10 l5. In o. well drill, spaced supports having notches, a.. cutter between the supports having an opening, a pin extending through the opening, a bushing on the pin having its end portions re in the notch of the other support >ëseclii‘ing the adjacent enel portions of the bushing ond pin to said other support.