EP0077336B1 - An extension coupling for rock drilling equipment - Google Patents

An extension coupling for rock drilling equipment Download PDF

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Publication number
EP0077336B1
EP0077336B1 EP82901041A EP82901041A EP0077336B1 EP 0077336 B1 EP0077336 B1 EP 0077336B1 EP 82901041 A EP82901041 A EP 82901041A EP 82901041 A EP82901041 A EP 82901041A EP 0077336 B1 EP0077336 B1 EP 0077336B1
Authority
EP
European Patent Office
Prior art keywords
coupling
screw
rod
sleeve
thread
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
Application number
EP82901041A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0077336A1 (en
Inventor
Gösta Christer GUSTAFSSON
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.)
SECOROC AB
Original Assignee
Fagersta AB
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 Fagersta AB, SECOROC AB filed Critical Fagersta AB
Priority to AT8282901041T priority Critical patent/ATE13925T1/de
Publication of EP0077336A1 publication Critical patent/EP0077336A1/en
Application granted granted Critical
Publication of EP0077336B1 publication Critical patent/EP0077336B1/en
Expired 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
    • E21B17/042—Threaded
    • E21B17/0426—Threaded with a threaded cylindrical portion, e.g. for percussion rods

Definitions

  • the present invention relates to an extension coupling for rock drilling equipment, comprising a coupling rod having an externally screw-threaded part and a smooth non-threaded part, the diameter of which is greater than the diameter of the external screw thread on the threaded part of the rod, and further comprising a sleeve-like part having a first part which is provided with an internal thread corresponding to the external thread of said rod, and the second part which has the form of a plain skirt and extends from the first, screw threaded part of the sleeve to the outer end thereof, and encloses part of the coupling rod behind the screw thread thereon.
  • an increased drilling rate i.e. an increase in the number of hole-meters or drilling-meters achieved per unit of time.
  • the increase in efficiency sought for is primarily achieved by increasing the power of the drilling machine.
  • the power of the drilling machine is increased by increasing the percussion energy of the hammer of the drilling machine, and also by increasing the torque of the machine, or by increasing the pressure at which the drilling equipment is fed against the rod, or by means of a combination of these measures.
  • a drill bit or coupling sleeve is mounted onto the coupling rod via a coupling joint, for example screwed. It also conventional for the length of the hollowed portion in the drill bit or coupling sleeve of the joint to be somewhat shorter than the corresponding part of the rod to be inserted into said bit or sleeve.
  • the U.S specification describes a coupling for joining two drill stem sections together in a manner to obtain a seal between mutually abutting ends of two pipe sections.
  • the coupling comprises a socket having a central shouldered portion which forms a seat for respective ends of pipe sections to be joined together.
  • the inner surfaces of the socket have screw-threads provided thereon, and one end of the socket has a smooth, tapered portion which provides a wedging fit for the respective pipe sections fitted thereinto.
  • Swedish specification No. 7006062-9 illustrates a coupling sleeve for joining two drill rods together, in which the screw-threads on the coupling sleeve are somewhat shorter in height than the corresponding screw-threads on the rods, this to avoid fracture of the drill rods at the screw-threaded regions thereof, when the rods are subjected to undue strain.
  • an extension coupling of the kind described in the introduction is characterized in that the second, plain part of the sleeve like part is a slide-fit with the smooth rod part of larger diameter, and encircles said smooth rod part in a manner to reduce the occurrence of bending stresses.
  • the extension coupling according to the invention has the advantage of eliminating practically completely the occurrence of bending stresses at said sensitive or risk sections of the drill rods, and also the dangerous fatigue effects of said bending stresses.
  • the extended part of the skirt of the drill bit or coupling sleeve has a supporting effect and because it assists in reducing the occurrence of harmful bending stresses in operation it is effective in reducing the risk of fracture at the aforementioned risk sections. Tests have shown that the bending stresses can be lowered by up to 80% with the aid of said extension.
  • Figure 1 is a partial sectional view of a drill bit provided with an extended skirt in accordance with the invention
  • Figure 2 is a partial sectional view through a coupling sleeve provided with an extended skirt in accordance with the invention.
  • FIG. 1 there is shown a couping rod 1 which is provided with a screw-thread and which has a drill bit 2 screwed thereonto.
  • the coupling rod has a screw-threaded portion 3 which co-acts with a corresponding screw-threaded portion 4 of the drill bit.
  • the drill bit has an extended skirt 5, the end part of which is slide-fitted over the plain part 6 of the coupling rod, i.e. the part thereof not provided with a screw-thread.
  • the inner diameter of the skirt 5 is slightly greater or substantially equal to the outer diameter of the coupling rod, while the length of said skirt is such that subsequent to assembling the coupling the skirt will extend over the stepped area 7 of the coupling rod, said stepped area forming a weak or sensitive section, and continues up along the plain portion 6 of the coupling rod.
  • Figure 2 illustrates two coupling rods 8 and 9 which are also provided with a screw-thread and screwed into a coupling sleeve 10 so that the mutually opposing ends of said rods abut each other.
  • the screw-threaded portion 12 of the coupling rod 9 engages the screw-threaded portion 13 of the sleeve, and the extended skirt 14 of the said sleeve extends over the stepped area 15 of the rod and continues up along the plain part 16 of said rod.
  • the skirt 14 is a slide fit with the plain portion 16 and thus has an inner diameter which is somewhat greater or substantially equal to the outer diameter of the plain portion 16.
  • the extended skirt passes beyond the stepped area of the coupling rod and embraces the plain part of said rod. It is also possible, however, to make the skirt shorter, so that it does not reach across the plain portion of the rod, but embraces solely the stepped area or a part of said stepped area, for example being made a slide-fit with said portion.
  • the coupling rod without the stepped area, in which case the plain portions 6, 16 of the illustrated embodiments are connected directly to the screw-threaded portions 3, 12.
  • an intermediate sleeve made of a plastics or rubber material, or some other soft and damping material, can be arranged between the extended skirt and the coupling rod.

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)
EP82901041A 1981-04-24 1982-03-26 An extension coupling for rock drilling equipment Expired EP0077336B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT8282901041T ATE13925T1 (de) 1981-04-24 1982-03-26 Kupplungsverlaengerung fuer gesteinsbohrmaschinen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8102626 1981-04-24
SE8102626A SE426089B (sv) 1981-04-24 1981-04-24 Skarvforband vid bergborrutrustning

Publications (2)

Publication Number Publication Date
EP0077336A1 EP0077336A1 (en) 1983-04-27
EP0077336B1 true EP0077336B1 (en) 1985-06-19

Family

ID=20343676

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82901041A Expired EP0077336B1 (en) 1981-04-24 1982-03-26 An extension coupling for rock drilling equipment

Country Status (9)

Country Link
EP (1) EP0077336B1 (fi)
AU (1) AU547091B2 (fi)
CA (1) CA1178944A (fi)
DE (1) DE3264233D1 (fi)
FI (1) FI77303C (fi)
IE (1) IE52613B1 (fi)
SE (1) SE426089B (fi)
WO (1) WO1982003653A1 (fi)
ZA (1) ZA822203B (fi)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2553171B1 (fr) * 1983-10-03 1988-04-08 Dril Quip Inc Appareil et procede pour raccorder notamment des elements cylindriques tels que des tubes
SE8600199L (sv) * 1986-01-17 1987-07-18 Loevab Loef Och Oestlund Ab Borrverktyg
US5622820A (en) * 1988-03-10 1997-04-22 City Of Hope Method for amplification and detection of RNA and DNA sequences
SE522221C2 (sv) * 2001-10-12 2004-01-27 Sandvik Ab Gängförband för slående bergborrning
JP4954542B2 (ja) 2005-12-09 2012-06-20 三菱マテリアル株式会社 掘削ロッド、掘削ビット及び掘削工具
CA2652279A1 (en) * 2006-05-17 2007-11-22 Sandvik Intellectual Property Ab A rock-drilling tool, a drill rod and a coupling sleeve

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2122757A (en) * 1935-07-05 1938-07-05 Hughes Tool Co Drill stem coupling
SE401232B (sv) * 1970-05-04 1978-04-24 Sandvik Ab Gengad forbindning for slagborrstenger

Also Published As

Publication number Publication date
IE820955L (en) 1982-10-24
EP0077336A1 (en) 1983-04-27
FI77303C (fi) 1989-02-10
FI824324A0 (fi) 1982-12-16
IE52613B1 (en) 1987-12-23
AU8275682A (en) 1982-11-04
AU547091B2 (en) 1985-10-03
FI77303B (fi) 1988-10-31
ZA822203B (en) 1983-02-23
WO1982003653A1 (en) 1982-10-28
DE3264233D1 (en) 1985-08-01
FI824324L (fi) 1982-12-16
SE426089B (sv) 1982-12-06
SE8102626L (sv) 1982-10-25
CA1178944A (en) 1984-12-04

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