US3800892A - Rock drill bit - Google Patents

Rock drill bit Download PDF

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Publication number
US3800892A
US3800892A US00150134A US3800892DA US3800892A US 3800892 A US3800892 A US 3800892A US 00150134 A US00150134 A US 00150134A US 3800892D A US3800892D A US 3800892DA US 3800892 A US3800892 A US 3800892A
Authority
US
United States
Prior art keywords
drill bit
inserts
rock drill
longitudinal axis
transverse plane
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
US00150134A
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English (en)
Inventor
E Fischer
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.)
Gebrueder Boehler and Co AG
Original Assignee
Gebrueder Boehler and Co AG
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
Application filed by Gebrueder Boehler and Co AG filed Critical Gebrueder Boehler and Co AG
Application granted granted Critical
Publication of US3800892A publication Critical patent/US3800892A/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
    • E21B10/36—Percussion drill 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
    • E21B10/36—Percussion drill bits
    • E21B10/38—Percussion drill bits characterised by conduits or nozzles for drilling fluids
    • 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
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/56—Button-type inserts

Definitions

  • a plurality of hard, wear-resistant inserts are mounted on the outer UNITED STATES PATENTS surface of the body of the bit adjacent the said trans- 3,185,228 5 1965 Kelly 175/410 erse 1am 3,536,150 l0/l970 Stebley l/4l0 X v p 3,548,959 12/1970 Hasiba /410 4 Claims, 1 Drawing Figure ROCK DRILL BIT
  • This invention relates to a rock drill bit, in particular a bit for percussion drilling apparatus, in which the end surface of the body of the drill bit is provided with wear resistant inserts shaped in the form of pins, the circumference of the bit being limited by an outer edge, there being wear resistant pins mounted at such outer edge.
  • a percussion drill bit in which there are provided insert pins at the outer edge, the insert pins being disposed in radial axial planes, but they are positioned in such planes diagonally with respect to the longitudinal axis of the bit.
  • the wall strengths of the drill bit body alongside the insert pins are inferior, and so the percussion drill bit has the disadvantage that with strong percussive stresses the drill bit body next to the insert pins is deformed; because of this the insert pins become loosened from the body of the bit.
  • the wear resistant inserts such as diamonds are positioned at the end surface of the drill bit body, which is built like a ball.
  • the diamonds are positioned at the outer edge of the drill bit body, overlapping diamond inserts being positioned diagonally of the longitudinal axis of the body. If one were to make percussion drill bits in this manner, such drill bits would have the same disadvantage as that described above in connection with known percussion drill bits.
  • this disadvantage of the aforementioned rock drill bit can be overcome by disposing hard, wear-resistant insert pins on the outer surface of the body of the bit in the plane normal to the longitudinal axis of the bit adjacent the largest diametered zone or edge of the body of the bit.
  • the drill bit of the instant invention gives the surprising technical effect that even under strong hitting stress the drill bit body alongside the inset pins will not be substantially deformed, and will provide the assurance that the inserts will be held tight on the drill bit body.
  • FIGURE of the drawing shows a rock drill bit half in an elevational view and half in an axial sectional view.
  • the illustrative drill bit the body 1 of which may be made of steel, is in the form of a body of revolution having a longitudinal axis a-b, the upper portion 9 of the body being in the form of a first upper frustum of a cone, a second, almost cylindrical, intermediate portion 8 of frusto-conical shape having an apex angle smaller than that of the upper portion of the body, and a lower end portion having a surface 2 at least generally in the form of a part of a sphere.
  • the outer junction between portion 8 and surface 2 is a circle 6 lying in a plane normal to axis a-b; circle 6 thus defines a limiting outer edge of the drill bit.
  • the upper portion 9 of the body 1 is provided with an axial threaded bore 10 for attachment of the drill bit to a drill rod (not shown).
  • the lower end of the drill bit is provided with a plurality of hard inserts 3 made, for example, of sintered tungsten carbide, the inserts 3 being generally in the form of cylindrical pins disposed normal to the part-spherical surface 2, the lower ends of pins 3 being rounded.
  • the drill bit is also provided with further hardened inserts in the form of cylindrical pins which are disposed generally above the inserts 3.
  • a first such set of inserts, designated 4 is disposed in a ring (one insert is shown at the left) coaxial of the axis a-b, the inserts 4 having their longitudinal axes disposed parallel to the axis a-b, the lower ends of inserts 4 having rounded outer and lower surfaces 4.
  • the overlapping ends of the aforementioned inserts 4 are rounded out only at the side 4 which is turned away from the drill bit body 1.
  • the outer ends of inserts 3 and the surface 4 of each insert 4 lie on an imaginary surface below and radially outwardly of and parallel to surface 2 of the body 1.
  • inserts 5 in the form of cylindrical pins, the longitudinal axes of the pins 5 extending radially of the axis a-b, and being located in a transverse plane c-d which lies normal to the axis a-b.
  • the upper surfaces of the inserts 5 lie substantially in the plane of circle 6, which as we have seen marks the border between the lower frusto-conical zone 8 and the lowermost part-spherical end of the drill bit having the surface 2.
  • Each of the inserts 5 has a rounded outer end surface 5' which is a part-spherical surface extending radially outwardly and upwardly from the lower surface of the insert 5 to an outer upper edge which lies substantially on the plane 6.
  • the outer edges of the insert pins 5 are rounded out only at the side 5' which is turned from the drill bit body.
  • Such upper outer edges of pins 5 extend radially outwardly beyond the surface of body 1 by a distance s.
  • lt is a feature of the present invention that a plane containing the upper edge of each insert 5 and tangent to the lower outer surface 4 of the next adjacent insert 4 makes an angle a with the longitudinal axis a-b on the drill bit which lies between 25 and 45.
  • the angle a is approximately 35.
  • additional overlapping inserts 12 which extend radially outwardly of the outer surface of the drill bit by a distance which substantially equals the distances by which the upper outer corners of the inserts 5 extend beyond the surface of the drill bit body.
  • angular inserts may be provided. Such angular inserts may, for instance, be 6 or 8 sided figures in cross-section. Such angular inserts may also be mounted, in the same manner as the round inserts, on the drill bit body in cylindrical holes in which they are held by solder.
  • the drill bit body is provided with scavenging channels 7 which are positioned normal to the end surface 2 and diagonal to the longitudinal axis a-b of the drill body. lnstead of the scavenging channels, or besides them an axial scavenging channel (not shown) may also be provided.
  • the drill bit body 1 also has conventional longitudinal extending slots 11, which are used divert the detritus formed by the drilling operation.
  • insert pins 5 within the scope of the invention, may be disposed diagonally of the longitudinal axis a-b rather than radially thereof as shown in the drawings and described above.
  • a rock drill bit adapted for use in percussion drilling apparatus, the drill bit having a body at least generally in the form of a body of revolution rotatable about its longitudinal axis, the body being generally longitudinally convex and having an outer edge of largest diameter disposed generally in a transverse plane normal to the longitudinal axis of the body, and hard, wearresistant inserts mounted on the outer surface of the body adjacent the said transverse plane, the radially outer ends of the inserts lying in said transverse plane, said radially outer ends of the inserts being rounded axially of the drill bit only on the radially outer and lower sides thereof.
  • a rock drill according to claim 1 wherein the radially outer ends of the inserts are rounded radially inwardly in a direction axially downwardly of the drill bit from the largest-diametered outer edge of the body.
  • a rock drill bit according to claim 1 wherein a plane passing through the outer edge of the body and tangent to an imaginary surface of revolution representing the effective surface of the lower end of the drill bit meet the longitudinal axis of the drill bit body at an included angle of from 25 to 45.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
US00150134A 1970-06-05 1971-06-04 Rock drill bit Expired - Lifetime US3800892A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT504170A AT302937B (de) 1970-06-05 1970-06-05 Gesteinsbohrkrone, insbesondere für Schlagbohrgeräte

Publications (1)

Publication Number Publication Date
US3800892A true US3800892A (en) 1974-04-02

Family

ID=3571262

Family Applications (1)

Application Number Title Priority Date Filing Date
US00150134A Expired - Lifetime US3800892A (en) 1970-06-05 1971-06-04 Rock drill bit

Country Status (6)

Country Link
US (1) US3800892A (OSRAM)
AT (1) AT302937B (OSRAM)
BE (1) BE768001A (OSRAM)
CH (1) CH521511A (OSRAM)
DE (1) DE2124958A1 (OSRAM)
FR (1) FR2095838A5 (OSRAM)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3915246A (en) * 1974-05-16 1975-10-28 Adel E Sheshtawy Rotary drilling bit
US4296825A (en) * 1977-11-25 1981-10-27 Sandvik Aktiebolag Rock drill
US4304312A (en) * 1980-01-11 1981-12-08 Sandvik Aktiebolag Percussion drill bit having centrally projecting insert
US4515226A (en) * 1983-03-07 1985-05-07 Norton Christensen, Inc. Tooth design to avoid shearing stresses
FR2623242A1 (fr) * 1987-11-12 1989-05-19 Contant Paul Carottier pneumatique pour fouilles cylindriques en roches
GB2296267A (en) * 1994-12-21 1996-06-26 Smith International Hammer rock bit gauge protection
US5655612A (en) * 1992-01-31 1997-08-12 Baker Hughes Inc. Earth-boring bit with shear cutting gage
US20060060388A1 (en) * 2004-08-17 2006-03-23 Sandvik Intellectual Property Ab Rock drill bit and a thread joint therefor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4101458A1 (de) * 1991-01-19 1992-07-23 Wolf Thomas Fuer einen mit axialem druck und schlaegen arbeitenden, umlaufenden gesteinsbohrer bestimmter bohrmeissel

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE645377A (OSRAM) *
US2689108A (en) * 1950-07-04 1954-09-14 Sandvikens Jernverks Ab Rock drill bit with hard m etal cutting insert
US3185228A (en) * 1963-01-21 1965-05-25 Hughes Tool Co Rotary-percussion drill bit with heel row inserts to prevent wedging
US3311181A (en) * 1964-05-04 1967-03-28 John B Fowler Bi-metal drilling tooth
US3346060A (en) * 1965-12-23 1967-10-10 Beyer Leaman Rex Rotary-air-percussion, stabilizer and reamer drill bit of its own true gauge
US3536150A (en) * 1968-09-05 1970-10-27 Frank E Stebley Rotary-percussion drill bit
US3548959A (en) * 1969-07-10 1970-12-22 Gulf Research Development Co Relief-type jet bits
US3583504A (en) * 1969-02-24 1971-06-08 Mission Mfg Co Gauge cutting bit

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE645377A (OSRAM) *
US2689108A (en) * 1950-07-04 1954-09-14 Sandvikens Jernverks Ab Rock drill bit with hard m etal cutting insert
US3185228A (en) * 1963-01-21 1965-05-25 Hughes Tool Co Rotary-percussion drill bit with heel row inserts to prevent wedging
US3311181A (en) * 1964-05-04 1967-03-28 John B Fowler Bi-metal drilling tooth
US3346060A (en) * 1965-12-23 1967-10-10 Beyer Leaman Rex Rotary-air-percussion, stabilizer and reamer drill bit of its own true gauge
US3536150A (en) * 1968-09-05 1970-10-27 Frank E Stebley Rotary-percussion drill bit
US3583504A (en) * 1969-02-24 1971-06-08 Mission Mfg Co Gauge cutting bit
US3548959A (en) * 1969-07-10 1970-12-22 Gulf Research Development Co Relief-type jet bits

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3915246A (en) * 1974-05-16 1975-10-28 Adel E Sheshtawy Rotary drilling bit
US4296825A (en) * 1977-11-25 1981-10-27 Sandvik Aktiebolag Rock drill
US4304312A (en) * 1980-01-11 1981-12-08 Sandvik Aktiebolag Percussion drill bit having centrally projecting insert
US4515226A (en) * 1983-03-07 1985-05-07 Norton Christensen, Inc. Tooth design to avoid shearing stresses
FR2623242A1 (fr) * 1987-11-12 1989-05-19 Contant Paul Carottier pneumatique pour fouilles cylindriques en roches
US5655612A (en) * 1992-01-31 1997-08-12 Baker Hughes Inc. Earth-boring bit with shear cutting gage
GB2296267A (en) * 1994-12-21 1996-06-26 Smith International Hammer rock bit gauge protection
GB2296267B (en) * 1994-12-21 1998-06-10 Smith International Hammer rock bit gage protection
US20060060388A1 (en) * 2004-08-17 2006-03-23 Sandvik Intellectual Property Ab Rock drill bit and a thread joint therefor
US7325633B2 (en) * 2004-08-17 2008-02-05 Sandvik Intellectual Property Ab Rock drill bit and a thread joint therefor

Also Published As

Publication number Publication date
AT302937B (de) 1972-11-10
CH521511A (de) 1972-04-15
FR2095838A5 (OSRAM) 1972-02-11
BE768001A (fr) 1971-11-03
DE2124958A1 (de) 1971-12-16

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