WO2001092677A1 - Improved core sampling drill bit - Google Patents

Improved core sampling drill bit Download PDF

Info

Publication number
WO2001092677A1
WO2001092677A1 PCT/AU2001/000624 AU0100624W WO0192677A1 WO 2001092677 A1 WO2001092677 A1 WO 2001092677A1 AU 0100624 W AU0100624 W AU 0100624W WO 0192677 A1 WO0192677 A1 WO 0192677A1
Authority
WO
WIPO (PCT)
Prior art keywords
crown
drill bit
primary
slots
core sampling
Prior art date
Application number
PCT/AU2001/000624
Other languages
French (fr)
Inventor
James Francis Dyer
Original Assignee
Boart Longyear Pty 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
Application filed by Boart Longyear Pty Ltd filed Critical Boart Longyear Pty Ltd
Priority to AU61895/01A priority Critical patent/AU6189501A/en
Publication of WO2001092677A1 publication Critical patent/WO2001092677A1/en

Links

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
    • E21B10/02—Core bits

Definitions

  • This invention relates to an improved earth drilling bit for obtaining core samples, and more specifically to an improved diamond impregnated drill bit for core sampling during ground drilling.
  • a conventional diamond impregnated drill bit is normally formed with a crown section having a height in the order of 10 mm, with the crown section being moulded with a plurality of crown segments which have radial end faces separated by radial waterways or channels which allow water to flow outwardly across the end face of the bit and remove the cuttings of the drilled rock.
  • the number of waterways formed in the crown of the drill bit normally depend on the size of the bit.
  • the height of the crown segment and the depth of these waterways is critical to the design strength of the drill bit. For example, with a conventional bit design, if the crown height is excessively increased, the overall strength of the segment is reduced such that the drill bit segment cannot withstand the forces involved in drilling.
  • an improved core sampling drill bit of the type having a tubular body which at one end is connectable to a drill string and which terminates at its other end in an impregnated diamond segmented crown characterised by a first set of primary circumf erentially spaced waterway forming radial slots formed in a first section of the crown and each of which extends axially inwards from the outer end face of the drill bit, and a second set of circumf erentially spaced secondary waterway forming radial slots formed in a second section of the crown and axially offset relative to and partially overlapping (or nearly so) said primary waterway forming slots, arranged so that, in use, as the drill bit wears away and the height of the crown progressively decreases, the primary waterway slots wear away followed by the secondary waterway slots and waterflow across the working end face of the bit is therefore uninterrupted.
  • the height of the crown of the drill bit can be significantly increased while still providing the requisite drilling strength, despite an increase in the number of waterways formed in the crown.
  • the axial depths of the primary and secondary waterway forming slots or channels are approximately equal, eg approximately 15 mm, thereby giving a total overall crown height of around 30 mm which compares with around 10 mm for a conventional diamond impregnated drill bit.
  • the drill bit of this invention can be drilled for the entirety of its working life without having to be removed from the drill hole to remove any "fileable” waterways or replace the bit for the conventional bit design. This avoids having to remove the drill rods and bit from the drill hole and stop production.
  • Figure 1 is a side view of a core sampling drill bit made in accordance with the present invention.
  • Figure 2 is a partly sectioned side elevational view of the drill bit shown in Figure 1;
  • Figure 3 is a end elevational view of the drill bit.
  • a diamond impregnated drill bit 10 having a metal tubular body 11 which is adapted for connection to a drill string member (not shown), and a radially segmented crown 12 integrally formed with the body 11 in accord with known art.
  • the wall of the crown 11 has formed therein a set of primary circumf erentially spaced waterway channels or slots 13 in an upper cutting matrix portion of the crown 12, and a set of secondary circumferentially spaced waterway slots or channels 14 in a lower cutting matrix portion of the crown 12, with the secondary waterway channels or slots 14 being axially offset or staggered in relation to the primary waterway channels or slots 13.
  • each of the waterway slots or channels 13, 14 formed in the wall of the crown 12 of the drill bit 10 has an axial depth of approximately 15 mm, with the height of the crown slightly greater than 30 mm.
  • Each of the primary waterway slots 13 extends axially inwards from the leading end face of the drill bit, with their inner ends overlapping with the upper leading ends of the secondary waterway slots 14. In this embodiment the amount of axial overlap is in the order of 1 mm. This ensures that once the primary waterway channels or slots 13 have been worn away, water flow continues across the radial end f ce of the drill bit by virtue of the "opening up" of the secondary waterway slots 14. It will be appreciated that the secondary waterway slots 14 form windows in the wall of the crown 12 and do not function until such time as the primary waterway slots have almost disappeared.
  • the arrangement of the waterway slots 13, 14 and their relative positioning are such that the overall design strength of the drill bit is not substantially reduced and will still be capable of withstanding the forces involved in drilling through rock formations.
  • each secondary waterway slot 14 joins to an axial watercourse forming groove 16 formed in the outer surface of the crown 12, with the bottom or trailing end of the groove 16 extending to the inner or bottom end of the crown 12, whereby water flowing through the waterway channels or slots 13 is able to flow downwardly past the drill bit along such watercourses.
  • Similar watercourse grooves 16' are formed on the inner cylindrical surface of the crown 12.
  • the initially closed ended slotted openings 14 do not extend to the bottom edge 18 of the crown 12 and terminate short thereof by approximately 2 to 3 mm.
  • This 2 to 3 mm bottom section of the crown 12 can be formed of a backing matrix rather than the cutting matrix which is used for the portions of the crown 12 containing the waterways 13, 14. It has been found that by having the secondary waterways 14 terminate short of the bottom edge 18 of the crown 12, there is unlikely to be any loss of water pressure during drilling. Water pressure loss may occur if the slots 14 extend right through to the bottom edge 18 of the crown.
  • the invention provides a vastly improved core sampling drill bit which has a substantially increased crown height achieved by having offset primary and secondary waterway channels or slots formed in upper and lower portions of the crown.
  • the drill bit has a substantially increased working life which increases drilling productivity and reduces the number of times the drill string has to be removed from the drill hole.

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)

Abstract

This invention relates to an improved core sampling drill bit (10) which has a substantially increased crown height achieved by having a first set of primary waterway channels or slots (13) formed in an upper portion of the crown (12), and a second set of secondary waterway channels or slots (14) formed in a lower portion of the crown (12), wherein the channels or slots (13, 14) are axially offset relative to one another and partially overlap, whereby during drilling, and the drill bit wears away, water flow across the end face of the bit remains uninterrupted.

Description

IMPROVED CORE SAMPLING DRILL BIT
This invention relates to an improved earth drilling bit for obtaining core samples, and more specifically to an improved diamond impregnated drill bit for core sampling during ground drilling.
A conventional diamond impregnated drill bit is normally formed with a crown section having a height in the order of 10 mm, with the crown section being moulded with a plurality of crown segments which have radial end faces separated by radial waterways or channels which allow water to flow outwardly across the end face of the bit and remove the cuttings of the drilled rock. The number of waterways formed in the crown of the drill bit normally depend on the size of the bit. The height of the crown segment and the depth of these waterways is critical to the design strength of the drill bit. For example, with a conventional bit design, if the crown height is excessively increased, the overall strength of the segment is reduced such that the drill bit segment cannot withstand the forces involved in drilling. This reduced strength has been partially combated by adding a "fileable" waterway in some bit types. However, this requires the fileable waterway to be manually filed out partway through the drilling life of the bit. This of course stops drill production and also requires the removal of the drill bit from the drill hole. This is extremely time consuming and uneconomical.
It will be appreciated that with conventional drill bits, once the bit has been worn away to an extent where the waterways no longer exist, it is necessary for the drill rods of the drill string to be removed from the drill hole and the drill bit changed. Again, this stops drill production and is therefore very uneconomical.
It is the main object of the present invention to provide an improved core sampling drill bit of the diamond impregnated type which allows the crown segment height to be significantly increased to that of a conventional drill bit without significantly affecting the design strength of the crown segment, and which can be drilled for a much longer period of time before having to be replaced, thereby increasing the productivity of the drill assembly and reducing the drill bit cost per metre of drilling.
It is another object of the present invention to provide an improved core sampling drill bit wherein the crown of the bit is formed with an increased number of waterways without substantially affecting or reducing the design strength of the crown segments.
Broadly according to this invention therefore, there is provided an improved core sampling drill bit of the type having a tubular body which at one end is connectable to a drill string and which terminates at its other end in an impregnated diamond segmented crown characterised by a first set of primary circumf erentially spaced waterway forming radial slots formed in a first section of the crown and each of which extends axially inwards from the outer end face of the drill bit, and a second set of circumf erentially spaced secondary waterway forming radial slots formed in a second section of the crown and axially offset relative to and partially overlapping (or nearly so) said primary waterway forming slots, arranged so that, in use, as the drill bit wears away and the height of the crown progressively decreases, the primary waterway slots wear away followed by the secondary waterway slots and waterflow across the working end face of the bit is therefore uninterrupted.
By having the primary and secondary waterway forming slots or channels axially offset and partially overlapping, the height of the crown of the drill bit can be significantly increased while still providing the requisite drilling strength, despite an increase in the number of waterways formed in the crown. Desirably, the axial depths of the primary and secondary waterway forming slots or channels are approximately equal, eg approximately 15 mm, thereby giving a total overall crown height of around 30 mm which compares with around 10 mm for a conventional diamond impregnated drill bit.
The drill bit of this invention can be drilled for the entirety of its working life without having to be removed from the drill hole to remove any "fileable" waterways or replace the bit for the conventional bit design. This avoids having to remove the drill rods and bit from the drill hole and stop production.
By having a drill bit which has two sets of waterways in a staggered array ensures that water flow across the end-face of the bit will not be interrupted during drilling. Any interruption of water flow during drilling may cause the bit to burn due to the bit face becoming overheated.
In order to further illustrate the present invention, a preferred embodiment thereof is described hereunder in some further detail with reference to and as illustrated in the accompanying drawings wherein:
Figure 1 is a side view of a core sampling drill bit made in accordance with the present invention;
Figure 2 is a partly sectioned side elevational view of the drill bit shown in Figure 1; while
Figure 3 is a end elevational view of the drill bit.
Referring to the drawings, there is shown a diamond impregnated drill bit 10 having a metal tubular body 11 which is adapted for connection to a drill string member (not shown), and a radially segmented crown 12 integrally formed with the body 11 in accord with known art. The wall of the crown 11 has formed therein a set of primary circumf erentially spaced waterway channels or slots 13 in an upper cutting matrix portion of the crown 12, and a set of secondary circumferentially spaced waterway slots or channels 14 in a lower cutting matrix portion of the crown 12, with the secondary waterway channels or slots 14 being axially offset or staggered in relation to the primary waterway channels or slots 13.
In this embodiment, each of the waterway slots or channels 13, 14 formed in the wall of the crown 12 of the drill bit 10 has an axial depth of approximately 15 mm, with the height of the crown slightly greater than 30 mm. Each of the primary waterway slots 13 extends axially inwards from the leading end face of the drill bit, with their inner ends overlapping with the upper leading ends of the secondary waterway slots 14. In this embodiment the amount of axial overlap is in the order of 1 mm. This ensures that once the primary waterway channels or slots 13 have been worn away, water flow continues across the radial end f ce of the drill bit by virtue of the "opening up" of the secondary waterway slots 14. It will be appreciated that the secondary waterway slots 14 form windows in the wall of the crown 12 and do not function until such time as the primary waterway slots have almost disappeared.
The arrangement of the waterway slots 13, 14 and their relative positioning are such that the overall design strength of the drill bit is not substantially reduced and will still be capable of withstanding the forces involved in drilling through rock formations.
It will be appreciated that the configuration of the waterway channels or slots 13, 14 could be varied in a number of ways and is not limited to the arrangement shown in Figures 1 and 2 where each secondary waterway slot 14 is centrally located between a pair of adjacent primary waterway slots 13 and equidistantly spaced from one another. In accordance with known art, each primary waterway slot 13 joins to an axial watercourse forming groove 16 formed in the outer surface of the crown 12, with the bottom or trailing end of the groove 16 extending to the inner or bottom end of the crown 12, whereby water flowing through the waterway channels or slots 13 is able to flow downwardly past the drill bit along such watercourses. Similar watercourse grooves 16' are formed on the inner cylindrical surface of the crown 12.
In this embodiment, the initially closed ended slotted openings 14 do not extend to the bottom edge 18 of the crown 12 and terminate short thereof by approximately 2 to 3 mm. This 2 to 3 mm bottom section of the crown 12 can be formed of a backing matrix rather than the cutting matrix which is used for the portions of the crown 12 containing the waterways 13, 14. It has been found that by having the secondary waterways 14 terminate short of the bottom edge 18 of the crown 12, there is unlikely to be any loss of water pressure during drilling. Water pressure loss may occur if the slots 14 extend right through to the bottom edge 18 of the crown.
A brief consideration of the above described embodiment will indicate that the invention provides a vastly improved core sampling drill bit which has a substantially increased crown height achieved by having offset primary and secondary waterway channels or slots formed in upper and lower portions of the crown. With this invention, the drill bit has a substantially increased working life which increases drilling productivity and reduces the number of times the drill string has to be removed from the drill hole.

Claims

THE CLAIMS DEFINING TFIE INVENTION ARE AS FOLLOWS:
1. A core sampling drill bit of the type having a tubular body which at one end is connectable to a drill string and which terminates at its other outer end in an impregnated diamond segmented crown characterised by: a first set of primary circumferentially spaced waterway forming radial slots formed in a first axial section of the crown and each of which extends axially inwards from the outer end face of the drill bit; a second set of circumferentially spaced secondary waterway forming radial slots formed in a second axial section of the crown and axially offset relative to and partially overlapping (or nearly so) said primary waterway forming slots; arranged so that, in use, as the drill bit wears away and the height of the crown progressively decreases, the primary waterway slots wear away followed by the secondary waterway slots and water flow across the working end face of the bit is therefore uninterrupted during the life of the bit.
2. A core sampling drill bit according to claim 1 wherein the primary and secondary waterway forming radial slots are equidistantly spaced apart from one another around the circumference of the crown.
3. A core sampling drill bit according to either claim 1 or claim 2 wherein said primary and secondary radial slots have a combined depth which is approximately equal to the height of said crown.
4. A core sampling drill bit according to claim 3 wherein the axial depths of said primary and secondary radial slots are approximately the same.
5. A core sampling drill bit according to claim 4 wherein the depth of each said slot is approximately 15 mm, and the height of said crown is approximately 30 mm.
6. A core sampling drill bit according to any one of the preceding claims wherein the amount of axial overlap between said primary and secondary radial slots is in the order of one millimetre.
7. A core sampling drill bit according to any one of the preceding claims wherein the crown consists of a cutting matrix portion and a backing matrix portion, and wherein said primary and said secondary radial slots extend only through the cutting matrix portion.
8. A core sampling drill bit according to any one of the preceding claims wherein each said primary radial slot joins to an axial watercourse forming groove in the outer surface of said crown, each said water course forming groove extending to the bottom edge of said crown.
PCT/AU2001/000624 2000-05-31 2001-05-29 Improved core sampling drill bit WO2001092677A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU61895/01A AU6189501A (en) 2000-05-31 2001-05-29 Improved core sampling drill bit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPQ7843 2000-05-31
AUPQ7843A AUPQ784300A0 (en) 2000-05-31 2000-05-31 Improved core sampling drill bit

Publications (1)

Publication Number Publication Date
WO2001092677A1 true WO2001092677A1 (en) 2001-12-06

Family

ID=3821918

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2001/000624 WO2001092677A1 (en) 2000-05-31 2001-05-29 Improved core sampling drill bit

Country Status (2)

Country Link
AU (1) AUPQ784300A0 (en)
WO (1) WO2001092677A1 (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2122111A2 (en) * 2006-12-14 2009-11-25 Boart Longyear Core drill bit with extended matrix height
AU2011201711B1 (en) * 2006-12-14 2011-07-28 Boart Longyear Company Core drill bit with extended matrix height
RU2455450C1 (en) * 2011-03-18 2012-07-10 Николай Митрофанович Панин Crown bit
US8459381B2 (en) 2006-12-14 2013-06-11 Longyear Tm, Inc. Drill bits with axially-tapered waterways
US8485283B2 (en) 2007-09-05 2013-07-16 Groupe Fordia Inc. Drill bit
US8590646B2 (en) 2009-09-22 2013-11-26 Longyear Tm, Inc. Impregnated cutting elements with large abrasive cutting media and methods of making and using the same
US8657894B2 (en) 2011-04-15 2014-02-25 Longyear Tm, Inc. Use of resonant mixing to produce impregnated bits
WO2015103213A1 (en) * 2013-12-30 2015-07-09 Longyear Tm, Inc No-waterway or single waterway drill bits and systems and methods for using same
US9279292B2 (en) 2013-11-20 2016-03-08 Longyear Tm, Inc. Drill bits having flushing and systems for using same
US9500036B2 (en) 2006-12-14 2016-11-22 Longyear Tm, Inc. Single-waterway drill bits and systems for using same
US9506298B2 (en) 2013-11-20 2016-11-29 Longyear Tm, Inc. Drill bits having blind-hole flushing and systems for using same
US10702975B2 (en) 2015-01-12 2020-07-07 Longyear Tm, Inc. Drilling tools having matrices with carbide-forming alloys, and methods of making and using same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1222811A1 (en) * 1984-10-18 1986-04-07 Budyukov Yurij E Diamond stepped-tooth bit
DE3738942A1 (en) * 1987-11-17 1989-06-01 Eastman Christensen Co Rotary bit for deep holes
SU1518480A2 (en) * 1987-04-06 1989-10-30 Казахский политехнический институт им.В.И.Ленина Diamond drilling bit
RU2055143C1 (en) * 1992-06-23 1996-02-27 Институт сверхтвердых материалов АН Украины Diamond drill bit
AU724612B3 (en) * 2000-03-21 2000-09-28 Dht Technologies Limited Segment for a core drill bit and method of manufacture

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1222811A1 (en) * 1984-10-18 1986-04-07 Budyukov Yurij E Diamond stepped-tooth bit
SU1518480A2 (en) * 1987-04-06 1989-10-30 Казахский политехнический институт им.В.И.Ленина Diamond drilling bit
DE3738942A1 (en) * 1987-11-17 1989-06-01 Eastman Christensen Co Rotary bit for deep holes
RU2055143C1 (en) * 1992-06-23 1996-02-27 Институт сверхтвердых материалов АН Украины Diamond drill bit
AU724612B3 (en) * 2000-03-21 2000-09-28 Dht Technologies Limited Segment for a core drill bit and method of manufacture

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; Class Q49, AN 1986-317589/48, XP002905561 *
DATABASE WPI Derwent World Patents Index; Class Q49, AN 1990-252320/33, XP002905562 *
DATABASE WPI Derwent World Patents Index; Class Q49, AN 1996-475327/47, XP002905560 *

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8459381B2 (en) 2006-12-14 2013-06-11 Longyear Tm, Inc. Drill bits with axially-tapered waterways
AU2011201711B1 (en) * 2006-12-14 2011-07-28 Boart Longyear Company Core drill bit with extended matrix height
EP2122111A2 (en) * 2006-12-14 2009-11-25 Boart Longyear Core drill bit with extended matrix height
US7874384B2 (en) 2006-12-14 2011-01-25 Longyear Tm, Inc. Drill bits with increased crown height
EP2122111A4 (en) * 2006-12-14 2014-07-09 Longyear Tm Inc Core drill bit with extended matrix height
US7909119B2 (en) 2006-12-14 2011-03-22 Longyear Tm, Inc. Drill bits with notches and enclosed slots
US7918288B2 (en) 2006-12-14 2011-04-05 Longyear Tm, Inc. Drill bits with enclosed fluid slots and method
US7628228B2 (en) * 2006-12-14 2009-12-08 Longyear Tm, Inc. Core drill bit with extended crown height
AU2011201707B2 (en) * 2006-12-14 2011-07-21 Longyear Tm, Inc. Core drill bit with extended matrix height
US9074429B2 (en) 2006-12-14 2015-07-07 Longyear Tm, Inc. Drill bits with axially-tapered waterways
US8051929B2 (en) 2006-12-14 2011-11-08 Longyear Tm, Inc. Core drill bits with enclosed fluid slots
EP3299573A1 (en) * 2006-12-14 2018-03-28 Longyear TM, Inc. Core drill bit
US7828090B2 (en) 2006-12-14 2010-11-09 Longyear Tm, Inc. Drill bits with enclosed fluid slots and internal flutes
AU2007333850B2 (en) * 2006-12-14 2011-02-10 Boart Longyear Company Core drill bit with extended matrix height
US7958954B2 (en) 2006-12-14 2011-06-14 Longyear Tm, Inc. Drill bits with enclosed slots
US9500036B2 (en) 2006-12-14 2016-11-22 Longyear Tm, Inc. Single-waterway drill bits and systems for using same
US8485283B2 (en) 2007-09-05 2013-07-16 Groupe Fordia Inc. Drill bit
US8590646B2 (en) 2009-09-22 2013-11-26 Longyear Tm, Inc. Impregnated cutting elements with large abrasive cutting media and methods of making and using the same
US9903165B2 (en) 2009-09-22 2018-02-27 Longyear Tm, Inc. Drill bits with axially-tapered waterways
RU2455450C1 (en) * 2011-03-18 2012-07-10 Николай Митрофанович Панин Crown bit
US8657894B2 (en) 2011-04-15 2014-02-25 Longyear Tm, Inc. Use of resonant mixing to produce impregnated bits
US9279292B2 (en) 2013-11-20 2016-03-08 Longyear Tm, Inc. Drill bits having flushing and systems for using same
US9506298B2 (en) 2013-11-20 2016-11-29 Longyear Tm, Inc. Drill bits having blind-hole flushing and systems for using same
WO2015103213A1 (en) * 2013-12-30 2015-07-09 Longyear Tm, Inc No-waterway or single waterway drill bits and systems and methods for using same
US10702975B2 (en) 2015-01-12 2020-07-07 Longyear Tm, Inc. Drilling tools having matrices with carbide-forming alloys, and methods of making and using same

Also Published As

Publication number Publication date
AUPQ784300A0 (en) 2000-06-22

Similar Documents

Publication Publication Date Title
EP0872624B1 (en) Improvements in or relating to rotary drill bits
EP0995008B1 (en) Tubing shoe
EP1956187B1 (en) Tool holder block and sleeve retained therein by interference fit
US3135341A (en) Diamond drill bits
EP0572655B1 (en) Drill bit with improved insert cutter pattern
US4323130A (en) Drill bit
US10526849B2 (en) Cutting structure with blade having multiple cutting edges
WO2001092677A1 (en) Improved core sampling drill bit
CA1263109A (en) Integral blade hole opener
AU2014352879B2 (en) Drill bits having flushing and systems for using same
US20140131111A1 (en) Two-centre rotary boring bit and method for deepening an existing well
AU2014373896A1 (en) No-waterway or single waterway drill bits and systems and methods for using same
CN105765152B (en) Drill bit with blind hole pre-washing function and the system using drill bit
GB2333542A (en) Tubing shoe with reaming members
US20230287743A1 (en) Improved drill bit
IE56686B1 (en) Improvements in or relating to rotary drill bits
CA2291747A1 (en) Drag-type rotary drill bit
KR20210049810A (en) Drill bit with curved sludge grooves
GB2426988A (en) Tubular drill shoe
EP4065809A1 (en) Drill bit for boring earth and other hard materials
CN116075626A (en) Cut drill bit
WO2022147434A1 (en) Devices, systems, and methods for expandable block sets
RU2615660C1 (en) Drilling bit
CA2391192C (en) Rock drill bit
CA3214858A1 (en) Percussive drill bit

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP