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US3186501A - Rock-drilling bits - Google Patents

Rock-drilling bits Download PDF

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Publication number
US3186501A
US3186501A US46807A US4680760A US3186501A US 3186501 A US3186501 A US 3186501A US 46807 A US46807 A US 46807A US 4680760 A US4680760 A US 4680760A US 3186501 A US3186501 A US 3186501A
Authority
US
United States
Prior art keywords
collar
arms
shank
shaft
bit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US46807A
Other languages
English (en)
Inventor
Warburton Bruce Percival
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
P & V (mining & Engineering) Ltd
P & V Mining & Engineering Ltd
Original Assignee
P & V Mining & Engineering Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB2943159A external-priority patent/GB932205A/en
Application filed by P & V Mining & Engineering Ltd filed Critical P & V Mining & Engineering Ltd
Application granted granted Critical
Publication of US3186501A publication Critical patent/US3186501A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/08—Roller bits
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/08—Roller bits
    • E21B10/20—Roller bits characterised by detachable or adjustable parts, e.g. legs or axles

Definitions

  • This invention relates to drilling bits for rigs for sinking oil, water or gas wells, blast holes, exploratory and test drilling of rock formations and like purposes, of the kind known in the art generally as Rock Bits, which may be of different types, such as DragBits which carry cutting blades, Diamond Bits, which have faces armed with diamonds or Roller Bits" which have downwardly extending arms rotatably supporting rollers, usually conical, armed with one or more rows of cutting teeth which exert a rolling and percussive action on the drilled formation.
  • Rock Bits which may be of different types, such as DragBits which carry cutting blades, Diamond Bits, which have faces armed with diamonds or Roller Bits" which have downwardly extending arms rotatably supporting rollers, usually conical, armed with one or more rows of cutting teeth which exert a rolling and percussive action on the drilled formation.
  • An object of the invention is a rock bit assembly in which drag or diamond bit blade arms or roller bit arms may be interchangeably fitted and worn out or damaged blade or roller bit arms can be easily and quickly replaced.
  • a more particular object of the invention is a rock bit assembly comprising two or more similar detachable bit arms, terminating either in cutting blades, diamond-bear ing faces or rotatable toothed rollers, a hollow shank, a holder box securable to the drill pipe or drill collar and having a screw-threaded connection to said shank, said shank terminating downwardly in a ball-shaped enlargement engageable with complementary recesses in said arms, an internally tapered sleeve tightly engageable with a complementary external taper of said arms, and driving connection means between said shank and said sleeve.
  • the driving connection takes the form of a splined joint between the shank and the tapered sleeve, the top of which abuts directly on the box; and in another found the, assembly, the shank has a screw-threaded connection with the tapered sleeve .of opposite hand to its screw-threaded connection with the box.
  • the latter form of the assembly preferably includes a collar, in splined engagement with the shank, inserted between the lower edge of the box and the upper edge of the tapered sleeve.
  • bit arms are rotationally keyed to the tapered sleeve, mainly for the purpose of locating the arms relatively to the tapered sleeve during assembly,
  • the tapered sleeve may also havereaming stabilizers on its outer surface, which assist in guiding the bit; and these stabilizers may .have cutting edges attheir upper ends, which assist when taking the bit out of the hole, if the latter is obstructed by loose cuttings or pieces of the drilled formation lodged in the hole, if the bit is rotated while withdrawing it, thus causing the reaming stabilizers to exert a cutting and clearing action on such loose cuttings or pieces.v
  • FIGURE 1 is an elevation, partly in axial section, of one embodiment of the invention
  • FIGURE 2 isa similar view of a second embodiment
  • FIGURE 3 is a section on the line IH-III of FIG- URE 2;
  • FIGURE 4 is a detail view in elevation viewed in the direction of arrow IV of FIGURE 2;
  • FIGURE 5 is a fragmentary view corresponding to the lower part of FIGURE 2, showing roller bit arms replacing drag bit arms.
  • 10 is the hollow shank terminating in a ball-shaped enlargement 12 and having a lefthanded external screw-thread 14 (the sense of rotation of the bit being right-handed).
  • 16 are the bit arms (which for convenience of reading the drawing are shown as being two in number) having downwardly and inwardly directed pins, terminating respectively in a spear-point 18 and a double chisel 20, and rotatably supporting rollers 22, each of which is armed with three rows of teeth 24.
  • the arms have female spherical surfaces 26 which fit the ball 12, external tapers 28 which fit an internal taper 30 of a sleeve 32, and keyways 34 engaged by keys 36 on sleeve 32.
  • the latter has an internal, left-hand screw-thread 38 engaging the screw-thread 14 of shank 10.
  • shank 10 has an external, right-hand screw-thread 40 engaging an internal screw-thread 42 of the connecting box 44, which is connected to the drillcollar or drill-pipe in any convenient way. Between the screw-threads 14 and 40 the shank 10 has an externally splined portion 46 of enlarged diameter engaging internal splines 48 of a collar 50, which, when the bit is assembled as shown in the drawing, is held in position between the connecting box 44 and the tapered sleeve 32.
  • Re-assembly is effected by performing the foregoin steps in reverse.
  • FIGURES 2 to 4 in which elements common to these figures and to FIGURE 1 are identified by the similar reference characters, the second embodiment differs from the first (illustrated in FIGURE 1) mainly in that the screw-threaded connection 14, 38
  • the lower end of the box 44 bears directly on the upper end of the tapered sleeve 32', and, when the box is screwed down the thread 40 of the shank 10,, it forces the internal taper 30 of sleeve 32' into tight frictional engagement with the external taper 28 of the arms 16, which are located by the ball 12 of'shank 10' and also by a flange 58 on the shank engaging complementary arcuate grooves formed in the bit arms 16'.
  • the hand of the screw-threads 40, 42 is the same as the direction of rotation of the assembly when drilling, so that the resistance encountered by the bit tends to tighten the tapers 30 of the sleeve 32 and 28 of the arms 16' on one another.
  • the arms 16 are shown as drag bit arms, three in number, having cutting blades 52 formed thereon.
  • the tapered sleeve 32' further has reaming stabilizers 54 formed on its outer surface, shaped as shown in FIG- URES 3, 4 and 5.
  • FIGURE 3 the direction of rotation is indicated by'an arrow, and
  • FIGURE 4 shows the cutting edge 60 at the upper end of the stabilizer 54, the purpose of which has already been mentioned.
  • the box 44 has an external taper screw-thread 56 for connecting it to the drill-pipe or drill-collar of the drilling rig.
  • Dismantling of the assembly is effected by unscrewing the box 44 from the shank the latter being held against rotation by holding the tapered sleeve 32 with a'wrench, the splined joint 46, 48 preventing the shank 10 from rotating.
  • the tapered sleeve 32 can be slidoif the shank 10 and arms 16 upwardly, thus releasing the arms 16' from the shank.
  • Reassembly is effected by reversing the foregoing procedure, rotation of the arms 16' relatively to the sleeve 32 being prevented during assembly by the keys and keyways 36, 34'. 1
  • FIGURE 5 shows the lower end of the assembly of FIGURES 2 to 5, in which the drag bit arms 16' of FIG- URES 2 to 5 have been replaced by arms 16' carrying roller bits 18, 22, 24 generally similar to those of FIG- URE 1.
  • a rotary drill bit assembly comprising, in combination, a hollow shaft having an enlargement at its lower end and a threaded connection at its upper end, a connector piece attached to said threaded connection, said shaft carrying axially directed elements intermediate said ends, a collar surrounding the shaft, an upper region of the collar having elements complementary to said shaft elements and forming therewith peripheral engagement the bit arms to the collar, said connector piece bearing upon the upperregion of the collar to secure the assembly in position, the maximum dimension of the shaft enlargement then lying within the collar lower portion.
  • a rotary drill bit according to claim 1 wherein a circumferential flange is. formed on the shaft between the enlargement and the axially directed elements, corresponding recesses being formed in the bit arms, said flange and recesses providing axial location means between said shaft and arms.
  • a rotary drill bit assembly comprising, in combination, a series of drill bit arms, each having an upper support region comprising an inner surface formed with a depressed region of increased radius and an upwardly tapering outer surface of frusto-conical segmental shape,
  • At least one outwardly projecting element being formed adjacent to the lower end of said segment outer surface, a hollow drill shank having an enlargement at its lower end upon which said depressed regions fit closely, a collar surrounding said arms having a lower portion inner surface which is of downwardly flaredfrusto-conical shape closely fitting said arm outer surfaces, slots in said collar inner surface receiving the outwardly I projecting elements, an upper portion of the collar extending above the bit arms to surround an intermediate region of the shank, peripheral engagement means between an upper portion of the collar and said intermediate region comprising complementary elements on said portion inner surface and said region outer surface preventing relative rotation between the collar and the shank, the shank being screwthreaded at its upper end and a connector piece for attachment of the assembly to a drilling rig engaging said thread being securable thereby to abut the collar and lock the bit arms in position.
  • a rotary drill bit assembly according toclaim 3 wherein a circumferential flange is formed on the shank between the enlargement and the circumferential engagement means, corresponding recesses being formed in the bit arms, said recesses being located above said outwardly projecting elements.
  • a rotary drill bit assembly according to claim 3 further comprising side reaming cutters which project outwardly from the outer peripheral surface of the collar.
  • a rotary drill bit assembly comprising, in combination, a hollow shank having a threaded connection at an upper end, a connector piecesecurable thereto for attachment of the assembly to a drill stern, a bulbous enlargement at the lower end of the shank, a collar surrounding the shank comprising a lower portion having a downwardly widening frusto-conical inner surface and an upper portion located intermediate the length of the shank, drivingconnection means being provided between the upper portion and the shank, a circumferential flange on said shank between the enlargement and said driving means, at least two similar detachable bit arms frictionally securable between the shank and the collar lower portion, said arms having outer and inner surfaces respectively complementary to said collar inner surface and to said shank enlargement and flange, said flange forming thereby an axial location means for the arms, at least one key in the outer surface of each arm being engageable by respective complementary slots in the collar inner surface providing thereby circumferential location means for the arms, the maximum dimension of said
  • a rotary drill bit assembly comprising, in combination, a hollow shaft, a connection threaded to receive a connector piece at one end, of the shaft for attaching the assembly to a drilling rig and an enlargement at the other end of said shaft, a tubular member concentric with and surrounding the hollow shaft consisting of integrally formed collar and sleeve parts extending axially from each other, the collar'part being concentric with and surrounding said enlargement, drill bit arms held between the collar and the enlargement, the sleeve part surrounding an intermediate portion of the shaft and peripheral engagement means between the sleeve part and the shaft, said collar part having .an outer surface carrying radially projecting side reaming cutters and an inner surface comprising a main frusto-conical portion and radially directed elements adjacent to an outer end thereof circumferentially spaced on said inner surface, the arms having outer peripheral portions closelyfittingisaid frusto-conical portion and elements on said arm outer portions engaging said collar elements, said engagement maintaining the relative circumfer
  • a rotary drill bit assembly comprising, in combination, a hollow shank having a threaded connection at an upper end, a connector piece serewable thereto for attachment of the assembly to a drill stem, at bulbous enlargement at the lower end of the shank, side reaming cutters, a collar surrounding the shank comprising upper and lower portions,'the lower portion, within the axial length of which the maximum radial dimension of the shank enlargement lies, having an inner peripheral surface of downwardly widening frusto-conical form and an outer peripheral surface from which the side reaming cutters project outwardly, the upper portion being located intermediate the length of the shank and rotary driving connection means being provided between the upper portion and the shank, a circumferential flange on said shank between the enlargement and the driving means, two similar detachable bit arms frictionally securable between the shank and the collar lower portion said arms having upper regions with inner and outer surfaces that are, respectively, complementary to said collar lower portion inner surface and to said shank

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Earth Drilling (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
US46807A 1959-08-28 1960-08-01 Rock-drilling bits Expired - Lifetime US3186501A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2943159A GB932205A (en) 1959-08-28 1959-08-28 Improvements in or relating to earth and rock drilling bits
GB3365659 1959-10-05

Publications (1)

Publication Number Publication Date
US3186501A true US3186501A (en) 1965-06-01

Family

ID=26259914

Family Applications (1)

Application Number Title Priority Date Filing Date
US46807A Expired - Lifetime US3186501A (en) 1959-08-28 1960-08-01 Rock-drilling bits

Country Status (6)

Country Link
US (1) US3186501A (pt)
BE (1) BE603562A (pt)
DE (1) DE1188529B (pt)
FR (1) FR1287225A (pt)
GB (1) GB832205A (pt)
NL (1) NL263085A (pt)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3327794A (en) * 1964-10-16 1967-06-27 Ernest S Creel Drill bit assembly
DE3021733A1 (de) * 1980-06-10 1981-12-24 Kennametal Inc., 15650 Latrobe, Pa. Rotary-kegelrollenmeissel
US4335794A (en) * 1979-01-12 1982-06-22 Kennametal Inc. Rotary cone cutter
EP0059497B1 (en) * 1981-03-02 1985-05-15 Agfa-Gevaert N.V. Photographic silver halide colour materials and process for the production of dye images by diffusion transfer

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2599854A (en) * 1949-12-10 1952-06-10 Paul A Mcmurdy Well-drilling bit
US2656153A (en) * 1949-09-12 1953-10-20 Thomas A White Rotary drilling bit
US2831657A (en) * 1949-11-30 1958-04-22 Herbert J Hawthorne Removable blade drag bits
US2859942A (en) * 1957-05-15 1958-11-11 Earl M Weaver Detachable blade bit
US2890020A (en) * 1949-11-30 1959-06-09 Herbert J Hawthorne Removable blade drag bits
US3039548A (en) * 1958-01-30 1962-06-19 Wendell Coffee Detachable blade bit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2783973A (en) * 1951-02-20 1957-03-05 Herbert J Hawthorne Drill bit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2656153A (en) * 1949-09-12 1953-10-20 Thomas A White Rotary drilling bit
US2831657A (en) * 1949-11-30 1958-04-22 Herbert J Hawthorne Removable blade drag bits
US2890020A (en) * 1949-11-30 1959-06-09 Herbert J Hawthorne Removable blade drag bits
US2599854A (en) * 1949-12-10 1952-06-10 Paul A Mcmurdy Well-drilling bit
US2859942A (en) * 1957-05-15 1958-11-11 Earl M Weaver Detachable blade bit
US3039548A (en) * 1958-01-30 1962-06-19 Wendell Coffee Detachable blade bit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3327794A (en) * 1964-10-16 1967-06-27 Ernest S Creel Drill bit assembly
US4335794A (en) * 1979-01-12 1982-06-22 Kennametal Inc. Rotary cone cutter
DE3021733A1 (de) * 1980-06-10 1981-12-24 Kennametal Inc., 15650 Latrobe, Pa. Rotary-kegelrollenmeissel
EP0059497B1 (en) * 1981-03-02 1985-05-15 Agfa-Gevaert N.V. Photographic silver halide colour materials and process for the production of dye images by diffusion transfer

Also Published As

Publication number Publication date
GB832205A (en) 1960-04-06
FR1287225A (fr) 1962-03-09
NL263085A (pt)
DE1188529B (de) 1965-03-11
BE603562A (pt)

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