EP1463869B1 - Driver - Google Patents

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Publication number
EP1463869B1
EP1463869B1 EP02793615A EP02793615A EP1463869B1 EP 1463869 B1 EP1463869 B1 EP 1463869B1 EP 02793615 A EP02793615 A EP 02793615A EP 02793615 A EP02793615 A EP 02793615A EP 1463869 B1 EP1463869 B1 EP 1463869B1
Authority
EP
European Patent Office
Prior art keywords
dogging element
drill bit
splines
dogging
shaft
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
EP02793615A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1463869A1 (en
Inventor
Thomas Greijer
Karl Axel Stjernström
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.)
Epiroc Drilling Tools AB
Original Assignee
Atlas Copco Secoroc AB
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 Atlas Copco Secoroc AB filed Critical Atlas Copco Secoroc AB
Publication of EP1463869A1 publication Critical patent/EP1463869A1/en
Application granted granted Critical
Publication of EP1463869B1 publication Critical patent/EP1463869B1/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
    • 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
    • E21B17/046—Couplings; joints between rod or the like and bit or between rod and rod or the like with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches
    • 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
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/20—Drives for drilling, used in the borehole combined with surface drive

Definitions

  • the present invention relates to a driver or dogging element for transferring torsion forces between a rotating outer tube and the drill bit of a down-the-hole hammer.
  • rotational forces, feed, and percussion energy are transferred from a drilling unit to a down-the-hole hammer that is lowered into the hole to be drilled.
  • the rotational forces are transferred with the aid of a rotating outer tube such as to cause the drill bit to rotate, and the percussion forces are transferred with the aid of a piston or ram that moves reciprocatingly in the tube in its longitudinal direction.
  • the rotational force is transferred from the outer tube by means of a chuck or dogging element screwed firmly into the outer tube.
  • a chuck or dogging element Arranged inside the dogging element or chuck is an array of splines which co-act with splines arranged on the outside of the drill bit shaft.
  • the drill bit, the outer tube and the dogging element or chuck are all made of steel.
  • an object of the present invention is to provide for the transfer of torsion forces between a rotating outer tube and a drill bit of a down-the-hole hammer a novel driver or dogging element that overcomes the aforesaid problems.
  • a driver or dogging element which dogging element internally is provided with splines intended for co-action with splines provided on a shaft of the drill bit, wherein the shaft with its splines on the drill bit is made of steel.
  • the invention is characterised in that dogging element with its splines is made from a material that is softer than that of the shaft and splines of the drill bit that co-act with the dogging element.
  • Figure 1 is a longitudinally sectioned view of a drill bit for a down-the-hole hammer and shows those parts that are in closest connection with the drill bit; and
  • Figure 2 is a cross-sectional view of an inventive dogging element included in the Figure 1 embodiment.
  • Figure 1 thus shows a drill bit 1 that has rock drilling buttons 2 mounted on its front end in a known manner.
  • the drill bit 1 also includes a shaft 3 which is provided with longitudinally extending splines 4 along a part of its length.
  • the drill bit also has a rear end 5 against which a percussion piston is intended to strike.
  • the drill bit 1 typically includes a longitudinally extending channel 6 through which compressed air is blown out from the front part of the drill to blow the drill cuttings away from the drill bit and out of the drill hole.
  • the shaft 3 carries a driver or dogging element 7 which is provided internally with longitudinally extending splines 8 that co-act with the splines 4.
  • the dogging element 7 is generally in the form of a sleeve and is provided along at least part of its length with an external screw thread 9 by means of which the dogging element 7 can be screwed securely to the front end of an outer tube 10 that surrounds at least a part of both the dogging element 7 and the shaft 3 of the drill bit 1.
  • the outer tube 10 also surrounds the percussion piston 11.
  • the down-the-hole hammer can be spliced or joined to allow the drill run to be extended to a desired length.
  • the drilling unit causes the outer tube 10 to rotate, wherewith the rotational movement of the tube is transmitted to the dogging element 7 which, in turn, transfers the rotational movement to the drill bit 1 through the medium of the spline connection 8, 4.
  • the dogging element 7 is made of a material that is significantly softer than those parts of the drill bit 1 that co-act with the dogging element, i.e. than the shaft 3, therewith avoiding those problems associated with the formation of cracks, fissures, and with breakage of the shaft 3.
  • a bronze alloy is a suitable material for the dogging element. This alloy may be a tin bronze alloy or a chromium bronze alloy.
  • a tin bronze alloy produced by Applicants Atlas Copco Secoroc AB and designated 11 9351 93 has been found to be excellent in this respect.
  • the dogging element 7 When the dogging element 7 is made of this softer material, it is this material that suffers the wear and tear rather than the steel in the shaft 3 of the drill bit co-acting with the dogging element.
  • force is transmitted by the splines 8 on the dogging element to the splines 4 on the shaft 3, wherewith the splines 8 on the dogging element, which are softer than the splines 4, will become worn instead of the splines 4 on shaft of the drill bit 1.
  • the splines 8 on the dogging element may be allowed to wear down to about half their original width before needing to replace the dogging element. Breakage or fracture of the dogging element 7 will not cause any serious damage, since it is only the dogging element that breaks while the drill bit will still be held firmly by the outer tube 10.
  • the preferred material is not only softer than steel, but also a high thermal conductivity, especially has higher thermal conductivity and lower friction than steel, meaning that the stresses and strains in the spline connection will be much lower than those experienced with known techniques using steel on steel contact.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Vending Machines For Individual Products (AREA)
  • Pyrane Compounds (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Dental Preparations (AREA)
  • Organic Insulating Materials (AREA)
EP02793615A 2001-12-21 2002-12-10 Driver Expired - Lifetime EP1463869B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0104376 2001-12-21
SE0104376A SE524153C2 (sv) 2001-12-21 2001-12-21 Medbringare till sänkborrhammare utförd i material mjukare än materialet i skaftet
PCT/SE2002/002275 WO2003062585A1 (en) 2001-12-21 2002-12-10 Driver

Publications (2)

Publication Number Publication Date
EP1463869A1 EP1463869A1 (en) 2004-10-06
EP1463869B1 true EP1463869B1 (en) 2007-05-09

Family

ID=20286474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02793615A Expired - Lifetime EP1463869B1 (en) 2001-12-21 2002-12-10 Driver

Country Status (9)

Country Link
US (1) US20060000645A1 (sv)
EP (1) EP1463869B1 (sv)
AT (1) ATE362035T1 (sv)
CA (1) CA2470211A1 (sv)
DE (1) DE60220097T2 (sv)
ES (1) ES2287350T3 (sv)
SE (1) SE524153C2 (sv)
WO (1) WO2003062585A1 (sv)
ZA (1) ZA200404804B (sv)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IES20060005A2 (en) 2006-01-04 2007-02-21 Minroc Techn Promotions Ltd A drill bit assembly for fluid-operated percussion drill tools
SE534173C2 (sv) * 2009-08-28 2011-05-17 Atlas Copco Secoroc Ab Borrsträngskomponenet med vibrationsdämpande struktur anordnad i anslutning till åtminstone en del av dess insida
IES20090701A2 (en) 2009-08-31 2010-05-12 Minroc Techn Promotions Ltd A drill bit assembly for fluid-operated percussion drill tools
IES20100666A2 (en) 2010-10-15 2011-06-22 Minroc Techn Promotions Ltd A down-the-hole hammer

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2973047A (en) * 1958-11-06 1961-02-28 Thompson Products Ltd Rock drill bit and method of manufacture thereof
USRE36002E (en) * 1990-04-26 1998-12-22 Sds Digger Tools Pty, Ltd. Transmission sleeve for a down hole hammer
US5090500A (en) * 1990-11-30 1992-02-25 Sandvik Rock Tools, Inc. Replaceable wear sleeve for percussion drill
SE505170C2 (sv) * 1993-12-13 1997-07-07 G Drill Ab Sänkborrmaskin med sammanpressbart distansrör
FI945965A0 (fi) * 1994-11-11 1994-12-20 Valto Ilomaeki Foerfarande foer borrning av ett haol med en stoetborrmaskin och motsvarande kutterspindel
US5803192A (en) * 1996-05-13 1998-09-08 Holte; Ardis L. Drill bit retainer for a down hole hammer assembly
US5816342A (en) * 1997-01-27 1998-10-06 Columbia Gas Distribution Companies Small diameter impact boring tool
US6105693A (en) * 1999-02-18 2000-08-22 Sandvik Ab Partially enhanced percussive drill bit
SE523946C2 (sv) * 2001-12-21 2004-06-08 Atlas Copco Secoroc Ab Sänkborrhammare där ytterröret helt omsluter en medbringare
EP1490160A1 (en) * 2002-04-03 2004-12-29 Cleaire Advanced Emission Controls, LLC. Fluid-cooled mount for an injector

Also Published As

Publication number Publication date
SE524153C2 (sv) 2004-07-06
DE60220097T2 (de) 2008-01-10
ES2287350T3 (es) 2007-12-16
SE0104376L (sv) 2003-06-22
EP1463869A1 (en) 2004-10-06
SE0104376D0 (sv) 2001-12-21
US20060000645A1 (en) 2006-01-05
WO2003062585A1 (en) 2003-07-31
CA2470211A1 (en) 2003-07-31
DE60220097D1 (de) 2007-06-21
ATE362035T1 (de) 2007-06-15
ZA200404804B (en) 2005-08-29

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