US3213951A - Rock drill with socket having a curved surface - Google Patents

Rock drill with socket having a curved surface Download PDF

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US3213951A
US3213951A US280860A US28086063A US3213951A US 3213951 A US3213951 A US 3213951A US 280860 A US280860 A US 280860A US 28086063 A US28086063 A US 28086063A US 3213951 A US3213951 A US 3213951A
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socket
mouth
rod
bit
diameter
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US280860A
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Edwin G Eeles
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17957—Friction grip
    • Y10T279/17965—Drill type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/70—Interfitted members

Definitions

  • a conventional push-on type of drill bit comprises a cutting head and a rod-receiving socket portion having a skirt with an interior linearly tapered surface section and usually a second surface section of approximately constant diameter, and a dome.
  • the rod for use with such a bit has a linearly tapered end section of complementary dimensions for engagement with the tapered surface section of the bit skirt.
  • 10 is a drill rod and 11 a bit in accordance with the invention.
  • the bit 11 has a cutting head 12 with Water holes 13 and a skirt 14 having an interior cylindrical surface 14a forming a socket 15 for reception of the tapered end 16 of the rod 10.
  • the interior or rodseating surface portion 17 of the bit skirt is of a curved tapered contour
  • the complementary surface 18 of the rod end 16 is of a nearly mating curved tapered contour
  • the entire cylindrical surface 14a of the skirt 14 and comprising the surfaces 17 and 19 and dome 21, constitutes the entire longitudinal extent of the socket.
  • the interior cylindrical surface 14a of the skirt is fundamentally circular in cross-section throughout its extent and has a longitudinal axis of symmetry.
  • the surface portion 17 is curved in the longitudinal section thereof.
  • the surface 14a has a maximum diameter of successively decreasing degree from the mouth throughout the entire longitudinal extent of such surface.
  • F is a plane lying normal to the longitudinal axis of the bit and in which lies the socket mouth end of the bit.
  • FL length of tapered section of bit.
  • D diameter of mouth.
  • the taper length (y) is 1.25 inches with a value for d of 0.65 inch. It is not desirable to use values of d significantly above this figure, as the consequent reduction of section may result in failures on a pseudo-buckling basis. The value of d cannot be reduced excessively, as the necessary resultant reduction in rod tip diameter may be impossible on some, rods due to non-axiality of the water hole. The choice of dimensions giving a high mouth angle (a) is not desirable, as the interference forces holding the bit onto the rod traction of the clearance from the values of at given in I Table I.
  • the taper length is 1.125 to 1.50 inches, the bit radius 6 to 10 inches and the root clearance 0.010 to 0.050 inch.
  • root clearance as employed in the appended claims means the radial clearance between the mating surfaces of rod and bit in the assembly at the root or small diameter section of such surfaces.
  • a drilling device comprising a drill bit having a cutting head and a rod receiving skirt defining a socket, said skirt having an interior cylindrical surface constituting the entire longitudinal extent of said socket and an edge defining the mouth of said socket, said surface being fundamentally circular in cross-section throughout its extent and having a longitudinal axis of symmetry, said surface being curved in the longitudinal section thereof and having a maximum diameter at said mouth and a diameter of successively decreasing degree from said mouth throughout the entire longitudinal extent of said surface.
  • a drill bit comprising a cutting head and a skirt defining a socket, said skirt having an interior cylindrical surface constituting the entire longitudinal extent of said socket and an edge defining the mouth of said socket, said surface having a longitudinal axis of symmetry and being circular in cross-section throughout its extent, said surface having a constant diameter portion remote from said mouth and a second portion extending from said constant diameter portion to said mouth, said second portion being curved in the longitudinal section thereof on a radius the center of which lies in a plane normal to said longitudinal axis and in which occurs the juncture of said surface portions, said surface having a maximum diameter at said mouth and a diameter of successively decreasing degree from said mouth throughout the entire longitudinal extent of said surface.
  • a drill bit as defined in claim 4 the length of said curved surface being 1.125 to 1.50 inches, and said radius of curvature being 6 to 10 inches.
  • a drilling assembly comprising a drill bit having a cutting head and a skirt defining a socket, said skirt having an interior cylindrical surface constituting the entire longitudinal extent of said socket and an edge defining the mouth of said socket, said surface having a longitudinal axis of symmetry and being circular in cross-section throughout its extent, said surface having a constant diameter portion remote from said mouth and a second portion extending from said constant diameter portion to said mouth, said second portion being curved in the longitudinal section thereof on a radius the center of which lies in a plane normal to said longitudinal axis and in which occurs the juncture of said surface portions, said surface having a maximum diameter at said mouth and a diameter of successively decreasing degree from said mouth throughout the entire longitudinal extent of said surface, and a rod having an end portion the surface of which is curved in the longitudinal section thereof on a constant radius, said rod surface being of gradually decreasing diameter towards the adjoining end of said rod, the diameter range of said second surface portion of said socket being approximately the same as that of said rod end portion surface.
  • a drill bit comprising a cutting head and a rodreceiving skirt having a rod-engageable interior surface, said surface having a dome section constituting the inner end thereof, and an outer end defined by the edge of said skirt, said surface being circular in cross-section throughout its extent and having a longitudinal axis of symmetry, the portion of said surface adjoining said dome section being of constant diameter, and the remaining portion of said surface being curved in the longitudinal section thereof, and having a gradually increasing diameter from a minimum diameter at the juncture With said constant diameter portion to a maximum diameter at said outer end.
  • a joint assembly comprising a first member having a skirt defining a socket, said skirt having an interior cylindrical surface constituting the entire longitudinal extent of said socket and an edge defining the mouth of said socket, said surface having a longitudinal axis of symmetry and being circular in cross-section throughout its extent, said surface having a constant diameter portion remote from said mouth and a second portion extending from said constant diameter portion to said mouth, said second portion being curved in the longitudinal section thereof on a radius the center of which lies in a plane normal to said longitudinal axis and in which occurs the juncture of said surface portions, said surface having a maximum diameter at said mouth and a diameter of suc cessively decreasing degree from said mouth throughout the entire longitudinal extent of said surface, and a second References Cited by the Examiner UNITED STATES PATENTS 1,203,025 10/ 16 McClain 30633 2,131,056 9/38 Lind 279-103 2,354,656 8/44 Annesley 287-l26 2,421,826 6/47 Baker 287-126 2,967

Description

E. G. EELES 3,213,951
ROCK DRILL WITH SOCKET HAVING A CURVED SURFACE Oct. 26, 1965 Filed May 16, 1963 PA'FIB \"I' AGE NT United States Patent Cfifice 3,213,951 Patent ed Oct. 26, 1965 Surveys Filed May 16, 1963, Ser. No. 280,860 11 Claims. (Cl. 175-414) This invention relates to rock drill bits and drilling assemblies and other structures where transmission of a force through a demountable joint is required.
A conventional push-on type of drill bit comprises a cutting head and a rod-receiving socket portion having a skirt with an interior linearly tapered surface section and usually a second surface section of approximately constant diameter, and a dome. The rod for use with such a bit has a linearly tapered end section of complementary dimensions for engagement with the tapered surface section of the bit skirt. These conventional bits have a limited life due to operational failures which most frequently are radial fractures in the skirt (ring-offs) and, to a lesser extent, radial failures through the base of the dome and the Water hole in the cutting head.
It has been determined that the use of linear tapers results in a large hoop stress discontinuity with resulting tensile forces which cause fatigue failures in the conventional bits.
It is an object of this invention to provide a drill bit and rod assembly which will result in reduced hoop stress discontinuity with consequent less failure incidence and increased operational life.
The invention will be described with reference to the accompanying drawing, the single figure of which is a sectional elevation of a bit and rod assembly in accordance with the invention.
Referring to the drawing, 10 is a drill rod and 11 a bit in accordance with the invention.
The bit 11 has a cutting head 12 with Water holes 13 and a skirt 14 having an interior cylindrical surface 14a forming a socket 15 for reception of the tapered end 16 of the rod 10.
In accordance with the invention, the interior or rodseating surface portion 17 of the bit skirt is of a curved tapered contour, and the complementary surface 18 of the rod end 16 is of a nearly mating curved tapered contour.
of the skirt leading to the dome 21 in order that there be no abrupt change in hoop stress at the root.
It will be apparent that the entire cylindrical surface 14a of the skirt 14 and comprising the surfaces 17 and 19 and dome 21, constitutes the entire longitudinal extent of the socket. The interior cylindrical surface 14a of the skirt is fundamentally circular in cross-section throughout its extent and has a longitudinal axis of symmetry. As previously indicated, the surface portion 17 is curved in the longitudinal section thereof. The surface 14a has a maximum diameter of successively decreasing degree from the mouth throughout the entire longitudinal extent of such surface.
It will be apparent that the provision of such surfaces 17 and 18 on the bit and rod makes possible an arrangement of such surfaces whereby true tangential separation of rod and bit is possible. It will be recognized that the provision of a theoretically-ideal rod shape is impractical, since it would be confined to one specific load for each shape, and the configuration chosen must be tolerant of production variables. However, there is illustrated in the figure the geometry of one configuration It is quite desirable that, as shown, there be a: smooth tangential transition of the surface portion 17 to the surface portion 19 of the constant diameter section 20 using nearly mating radii which is satisfactory for practic511 purposes and which approximates most closely to the l 63 I It is emphasized that there are many other geometrical configurations that are satisfactory, including one with nearly mating surfaces of opposite signs to those illustrated and nearly mating surfaces of non-constant radii of both signs. A concave radius on the rod and a convex radius on the bit are defined as those illustrated in the figure.
In the drawing,
F is a plane lying normal to the longitudinal axis of the bit and in which lies the socket mouth end of the bit.
L is a plane lying normal to the longitudinal axis of the bitdeirad in which occurs the juncture of surfaces 17 an AC =R=radius of rod surface 18. AO=r -radius of bit surface 17. BE=x=root clearance.
FL: =length of tapered section of bit. D=diameter of mouth.
d=diameter of surface 19.
a=mouth angle.
. It will be apparent that, if the radii AC and A0 were identical, the root clearance BE would be zero. This arrangement would of course be impractical since it is intolerant of production variables.
Considering triangle AOC,
It will be observed that the mouth angle on equal 20.
The following table gives by way of example suitable dimensional characteristics of curved taper bits in accordance with the invention, based upon a mouth diameter (D) of 0.875 inch.
TABLE I Examples of dimensions for curved taper bits 7 1 (in) r (in.) a d (in) 1. 4. 0 3240 O. 549 1.125 5. 0 26 0.619 1. 125 6. 0 2136 0. 663 1. 25 5. 0 2858 0. 557 1. 25 6.0 241 0.611 1. 25 7. 0 2034 0. 649 1. 25 8. 0 1758 0. 679 1. 375 5. 0 3156 0. 489 1. 375 6. 0 2630 0. 555 1. 375 7. 0 2240 0. 603 1. 375 8. 0 1948 0 637 1. 375 9. 0 1734 0. 667 1. 50 6. 0 2858 0. 493 l. 50 7. 0 2446 O. 549 1. 50 8. 0 2136 0. 591 1. 50 9. 0 1912 0. 623 1. 50 10. 0 1716 0. 649
In one form of standard bit, the taper length (y) is 1.25 inches with a value for d of 0.65 inch. It is not desirable to use values of d significantly above this figure, as the consequent reduction of section may result in failures on a pseudo-buckling basis. The value of d cannot be reduced excessively, as the necessary resultant reduction in rod tip diameter may be impossible on some, rods due to non-axiality of the water hole. The choice of dimensions giving a high mouth angle (a) is not desirable, as the interference forces holding the bit onto the rod traction of the clearance from the values of at given in I Table I.
TABLE 2 Examples of values of rod radius and root diameter for most suitable clearances and bit dimensions Taper Bit Root Rod Rod Root 1 Length Radius Clearance Radius Diameter 11 3- a at 037 5 125 0. 0090 5. 50 0432 0. 0218 5. 00 0194 2a 0. 0 34 25 0 0. 0033 0. 50 0314 0. 0191 0. 00 .0103 0. 0013 7. 00 0704 0. 0021 7. s0 0733 25 0 0. 0000 7. 50 0033 0. 0143 7. 00 0504 0. 0020 0. 90 32 0.0041 6.80 .5 375 O 0. 0107 0. 50 5816 0. 0233 0. 00 5504 0. 00 5 7. 0 224g 0. 00 1 7.3 0 1-375 M 0 0031 7. 00 .0203 0. 0173 7. 00 0043 3;" 2-3 223 0. 24 375 0 0. 0003 s. 50 0544 0. 0134 s. 00 0402 0. 0013 7. 00 5874 1 5 8 0 0.0037 7.30 .5330 0. 0007 7. 50 5710 0. 0207 7. 00 5490 0. 0014 3. 00 0202 1 5 9 0 0.0029 8.80 .0172 0. 0075 s. 50 0030 0. 0100 s. 00 5010 0. 0012 9. go 2122 0. 0023 0. 0 5 0 0. 0000 9. 50 0370 0. 0127 9. 00 .0230
Due to the curved nature of the contact between rod and bit, the use of the usual brass shim is rather impractical, but zinc spraying of the contacting surface of the bit may be used provided suitable dimensional changes are made in the bit and/or rod to compensate.
It should be observed that in the case considered the radius centre of the rod is in line with the end of the rod, while that of the bit is at a distance from the open end equal to the length of the taper section.
The data given in the tables is given by way of example for one configuration for one specific drill size; similar data for other sizes can readily be computed using the relations given.
As given in Table 2, the taper length is 1.125 to 1.50 inches, the bit radius 6 to 10 inches and the root clearance 0.010 to 0.050 inch.
The expression root clearance as employed in the appended claims means the radial clearance between the mating surfaces of rod and bit in the assembly at the root or small diameter section of such surfaces.
While the foregoing description has been directed mainly to drilling assemblies, it will be understood that the basic principals involved are equally applicable to any other structure involving the transmission of a force through'a demountable joint.
I claim:
1. A drilling device comprising a drill bit having a cutting head and a rod receiving skirt defining a socket, said skirt having an interior cylindrical surface constituting the entire longitudinal extent of said socket and an edge defining the mouth of said socket, said surface being fundamentally circular in cross-section throughout its extent and having a longitudinal axis of symmetry, said surface being curved in the longitudinal section thereof and having a maximum diameter at said mouth and a diameter of successively decreasing degree from said mouth throughout the entire longitudinal extent of said surface.
2. A drill bit as defined in claim 1, said curved surface being convex.
3. A drill bit as defined in claim 1, said curved surface being of constant radius.
4. A drill bit comprising a cutting head and a skirt defining a socket, said skirt having an interior cylindrical surface constituting the entire longitudinal extent of said socket and an edge defining the mouth of said socket, said surface having a longitudinal axis of symmetry and being circular in cross-section throughout its extent, said surface having a constant diameter portion remote from said mouth and a second portion extending from said constant diameter portion to said mouth, said second portion being curved in the longitudinal section thereof on a radius the center of which lies in a plane normal to said longitudinal axis and in which occurs the juncture of said surface portions, said surface having a maximum diameter at said mouth and a diameter of successively decreasing degree from said mouth throughout the entire longitudinal extent of said surface.
5. A drill bit as defined in claim 4, the length of said curved surface being 1.125 to 1.50 inches, and said radius of curvature being 6 to 10 inches.
6. A drill bit as defined in claim 5, said curved surface having a daimeter of about 0.549 to 0.679 inch. v
7. A drilling assembly comprising a drill bit having a cutting head and a skirt defining a socket, said skirt having an interior cylindrical surface constituting the entire longitudinal extent of said socket and an edge defining the mouth of said socket, said surface having a longitudinal axis of symmetry and being circular in cross-section throughout its extent, said surface having a constant diameter portion remote from said mouth and a second portion extending from said constant diameter portion to said mouth, said second portion being curved in the longitudinal section thereof on a radius the center of which lies in a plane normal to said longitudinal axis and in which occurs the juncture of said surface portions, said surface having a maximum diameter at said mouth and a diameter of successively decreasing degree from said mouth throughout the entire longitudinal extent of said surface, and a rod having an end portion the surface of which is curved in the longitudinal section thereof on a constant radius, said rod surface being of gradually decreasing diameter towards the adjoining end of said rod, the diameter range of said second surface portion of said socket being approximately the same as that of said rod end portion surface.
8. A drilling assembly as defined in claim 7, the center said radius of curvature of said rod end portion surface lying in the diametral plane of said adjoining end of said rod, said curved surface of said socket having a ;oot clearance with respect to said rod end portion surace.
9. A drilling assembly as defined in claim 8, said root clearance being in accordance with the formula 7 Sin 0. tan r(1Cos 6) where r is said radius of curvature of said bit surface section, 0 is the angle of r with said plane of juncture, and 1 is the angle of said radius of curvature of said rod surface with said diametral plane.
10. A drill bit comprising a cutting head and a rodreceiving skirt having a rod-engageable interior surface, said surface having a dome section constituting the inner end thereof, and an outer end defined by the edge of said skirt, said surface being circular in cross-section throughout its extent and having a longitudinal axis of symmetry, the portion of said surface adjoining said dome section being of constant diameter, and the remaining portion of said surface being curved in the longitudinal section thereof, and having a gradually increasing diameter from a minimum diameter at the juncture With said constant diameter portion to a maximum diameter at said outer end.
11, A joint assembly comprising a first member having a skirt defining a socket, said skirt having an interior cylindrical surface constituting the entire longitudinal extent of said socket and an edge defining the mouth of said socket, said surface having a longitudinal axis of symmetry and being circular in cross-section throughout its extent, said surface having a constant diameter portion remote from said mouth and a second portion extending from said constant diameter portion to said mouth, said second portion being curved in the longitudinal section thereof on a radius the center of which lies in a plane normal to said longitudinal axis and in which occurs the juncture of said surface portions, said surface having a maximum diameter at said mouth and a diameter of suc cessively decreasing degree from said mouth throughout the entire longitudinal extent of said surface, and a second References Cited by the Examiner UNITED STATES PATENTS 1,203,025 10/ 16 McClain 30633 2,131,056 9/38 Lind 279-103 2,354,656 8/44 Annesley 287-l26 2,421,826 6/47 Baker 287-126 2,967,738 1/61 Moore 30633 3,027,953 4/62 Coski 175409 BENJAMIN HERSH, Primary Examiner.
20 CARL W. TOMLIN, Examiner.

Claims (1)

1. A DRILLING DEVICE COMPRISING A DRILL BIT HAVING A CUTTING HED AND A ROD RECEIVING SKIRT DEFINING A SOCKET, SAID SKIRT HAVING AN INTERIOR CYLINDRICAL SURFACE CONSTITUTING THE ENTIRE LONGITUDINAL EXTENT OF SAID SOCKET AND AN EDGE DEFINING THE MOUTH OF SAID SOCKET, SAID SURFACE BEING FUNDAMENTALLY CIRCULAR IN CROSS-SECTION THROUGHOUT ITS EXTENT AND HAVING A LONGITUDINAL AXIS OF SYMMETRY, SAID SURFACE BEING CURVED IN THE LONGITUDINAL SECTION THEREOF AND HAVING A MIXIMUM DIAMETER AT SAID MOUTH AND A DIAMETER OF SUCCESSIVELY DECREASING DEGREE FROM SAID MOUTH THROUGHOUT THE ENTIRE LONGITUDINAL EXTENT OF SAISD SURFACE.
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022287A (en) * 1976-04-20 1977-05-10 Sandvik Aktiebolag Percussion drill bit
US4223587A (en) * 1978-02-27 1980-09-23 Hilti Aktiengesellschaft Self-drilling dowel assembly with an annular drill bit
US4321813A (en) * 1980-01-07 1982-03-30 Caterpillar Tractor Co. Pusher block for rotary forging machines and method of using same
US5150636A (en) * 1991-06-28 1992-09-29 Loudon Enterprises, Inc. Rock drill bit and method of making same
US5685381A (en) * 1995-07-21 1997-11-11 Kennametal South Africa (Proprietary) Limited Drill rod and drill bit with rocking connection
US20040079554A1 (en) * 2002-10-24 2004-04-29 Udo Hauptmann Cup-shaped rock drill head
US20060213693A1 (en) * 2005-03-25 2006-09-28 Zahradnik Anton F Rotary drill bit shank, rotary drill bits so equipped, and methods of manufacture
US20070175671A1 (en) * 2005-12-30 2007-08-02 Sandvik Intellectual Property Ab Rock drill tool, rock drill bit and production method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1203025A (en) * 1914-11-28 1916-10-31 Charles C Mcclain Wedge for tool-handles.
US2131056A (en) * 1936-03-25 1938-09-27 American Smelting Refining Drill
US2354656A (en) * 1942-01-05 1944-08-01 Annesley Griffith Drill bit
US2421826A (en) * 1945-04-09 1947-06-10 Jr John B Baker Separable drill bit
US2967738A (en) * 1958-04-09 1961-01-10 Moore Robert Edwin Tool handle fastening
US3027953A (en) * 1961-04-10 1962-04-03 Bernard F Coski Percussion tool with replaceable point

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1203025A (en) * 1914-11-28 1916-10-31 Charles C Mcclain Wedge for tool-handles.
US2131056A (en) * 1936-03-25 1938-09-27 American Smelting Refining Drill
US2354656A (en) * 1942-01-05 1944-08-01 Annesley Griffith Drill bit
US2421826A (en) * 1945-04-09 1947-06-10 Jr John B Baker Separable drill bit
US2967738A (en) * 1958-04-09 1961-01-10 Moore Robert Edwin Tool handle fastening
US3027953A (en) * 1961-04-10 1962-04-03 Bernard F Coski Percussion tool with replaceable point

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022287A (en) * 1976-04-20 1977-05-10 Sandvik Aktiebolag Percussion drill bit
US4223587A (en) * 1978-02-27 1980-09-23 Hilti Aktiengesellschaft Self-drilling dowel assembly with an annular drill bit
US4321813A (en) * 1980-01-07 1982-03-30 Caterpillar Tractor Co. Pusher block for rotary forging machines and method of using same
US5150636A (en) * 1991-06-28 1992-09-29 Loudon Enterprises, Inc. Rock drill bit and method of making same
US5685381A (en) * 1995-07-21 1997-11-11 Kennametal South Africa (Proprietary) Limited Drill rod and drill bit with rocking connection
US20040079554A1 (en) * 2002-10-24 2004-04-29 Udo Hauptmann Cup-shaped rock drill head
US7059432B2 (en) * 2002-10-24 2006-06-13 Hilti Aktiengesellschaft Cup-shaped rock drill head
US7594454B2 (en) 2005-03-25 2009-09-29 Baker Hughes Incorporated Methods of fabricating rotary drill bits
US20080066581A1 (en) * 2005-03-25 2008-03-20 Baker Hughes Incorporated Methods of fabricating rotary drill bits
US20080066970A1 (en) * 2005-03-25 2008-03-20 Baker Hughes Incorporated Rotary drill bits
US7472764B2 (en) 2005-03-25 2009-01-06 Baker Hughes Incorporated Rotary drill bit shank, rotary drill bits so equipped, and methods of manufacture
US20060213693A1 (en) * 2005-03-25 2006-09-28 Zahradnik Anton F Rotary drill bit shank, rotary drill bits so equipped, and methods of manufacture
US7600589B2 (en) 2005-03-25 2009-10-13 Baker Hughes Incorporated Rotary drill bits
US20100012392A1 (en) * 2005-03-25 2010-01-21 Baker Hughes Incorporated Shank structure for rotary drill bits
US7861806B2 (en) 2005-03-25 2011-01-04 Baker Hughes Incorporated Shank structure for rotary drill bits
US20070175671A1 (en) * 2005-12-30 2007-08-02 Sandvik Intellectual Property Ab Rock drill tool, rock drill bit and production method

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