US3717368A - Connection thread system for sets of extension drill rods - Google Patents

Connection thread system for sets of extension drill rods Download PDF

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Publication number
US3717368A
US3717368A US00081769A US3717368DA US3717368A US 3717368 A US3717368 A US 3717368A US 00081769 A US00081769 A US 00081769A US 3717368D A US3717368D A US 3717368DA US 3717368 A US3717368 A US 3717368A
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US
United States
Prior art keywords
thread
threads
diameter
connections
pitch
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Expired - Lifetime
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US00081769A
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English (en)
Inventor
T Czarnecki
B Soderman
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Fagersta Bruks AB
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Fagersta Bruks AB
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    • 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
    • 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

  • the pitch angle is selected to have a .value of between 6 and 8, preferably about 6.5, with a flank angle of 60.
  • one or more essentially longitudinal grooves are formed in the lands of the threads.
  • the present invention relates to a single entrance thread system for extension drill rod connections, and more particularly to male and female threads of a thread diameter range which is equal to and larger than about 3.75 cm., and in which the flank angle of the thread has a value of between 50 and 70.
  • extension drill connections are used in rock drills and usually have thread diameters larger than 3.75 cm. Frequently such rock drill extensions come in sets of varying, and increasing diameters; the
  • pitch angle ratio of pitch angle to flank angle, and its relationship to the diameter of the thread has not been systematically arranged.
  • Three thread types are most commonly used: (1) a pitch angle of between 64.8, with flank angles of about 70; (2) pitch angles of 6.7 to 47, with flank angles of 65; and (3) pitch angles between 112 to 8.4, with flank angles of 55; the large pitch angle of this type of thread has two entrances or starts, that is, it is of the double-helix type.
  • connections made with threads having the first two types of threads are frequently difficult to loosen after the connection has been used. During use, this type of connection can get very tightly locked.
  • the connection according to the third form on the contrary, has a tendency to loosen by itself during drilling. Additionally, in use it has been found that such a connection rapidly wears the threads. It is also difficult to manufacture large threaded connections with a double entrance, because the two thread entrances must be exactly matched to each other so that the thread will act as a unit in the connection.
  • the thread system for drill rod extensions having rod diameters of about 3.75 cm. and greater, is so arranged that the threads have always the same flank angle, this angle being selected between about 50 and 70; the pitch angle of the threads of all rods is also the same, regardless of the diameter of the rods. As a result, the pitch of the thread for rods of different diameters will change with the diameter.
  • the value of this constant pitch angle is selected to fall between about 6 and 8, preferably about 6.5 for a flank angle of60.
  • the threads are relatively easy to loosen, while still maintaining a sufficiently tight connection so that, in use, the threads will not come apart. Additionally, by a suitable choice of the flank angle, the threads can be made highly wear resistant, so that a well adapted surface pressure and suitable wear area and volume is obtained.
  • At least one of the elements to be threaded together preferably the 'rod portion, has one or more substantially longitudinally extending grooves.
  • the thread helix is given a certain amount of resiliance, which improves the locking of the male and female elements together, holds them tight during drilling operation, while also assisting in loosening of the joint for disassembly.
  • FIG. la is a developed diagrammatic illustration of a thread in accordance with the invention.
  • FIG. 1b is a fragmentary cross sectional view of the thread in accordance with the present invention and illustrating angular relations;
  • FIG. 2 is a diagram of torque characteristics of the thread of FIG. 1b;
  • FIG. 3a is top view of a thread with four longitudinal grooves
  • FIG. 3b is a side view of the thread of FIG. 3a.
  • a thread, preferably of trapezoidal form as seen in FIG. lb has a flank angle for example of 55.
  • the distance between adjacent lands of the thread, that is the pitch a varies in accordance with the diameter of the thread.
  • the pitch angle is indicated in FIG. la which shows a developed diagram.
  • a thread on a rod having a diameter of 37.5 mm will have a lesser pitch than a thread on a rod of a diameter of 56.2 mm the pitch angle of 7.5 remaining constant.
  • Any suitable flank angle can be used, the range of from 50 to having been found suitable. It has been found that a variation of pitch angle of between about 6 and 8 gives good results in that the compromise between tightness of coupling and capability of separation of the joint is maintained.
  • FIG. 2 illustrates a diagram in which the connecting torque M, is shown on the abscissa, with respect to the disconnecting torque m,,, shown on the ordinate.
  • the straight line is representative of the connection-disconnecting torque relationship. This line is independent of variation in diameter; as can be seen, the respective connecting and disconnecting torque fall on a straight line, independent of thread diameter.
  • the helix can be provided with one or more essentially longitudinally extending grooves 1 (FIG. 3a, b) in the lands of the rod portion of the thread.
  • the thread 2 is formed with a trapezoidal cross section (see also FIG. lb). This shape permits easy manufacture and ready unthreading as well as re-threading thereafter.
  • the female coupling will, 'of course, will have a thread matching that of the male coupling, for example as illustrated in FIG. 1b, where the illustration may represent both an outside thread fragment as well as an inside thread portion.
  • Drill rods in sets can be made with the thread system of the present invention in sizes from about 3.75 cm up to cm, for example in steps of 0.6 cm.
  • Standard thread system for cylindrical rock drill rod connections having a continuous thread diameter of at least 3.75 cm, said thread having a flank angle between about 50 70;
  • Thread system according to claim 1 wherein the thread has trapezoidal cross sectional form.
  • Thread system according to claim 1 wherein at least one essentially longitudinal groove is formed along the length of the lands of the threads to provide resilience in the thread helix for assembly and disassembly.
  • At least one essentially longitudinal groove is formed along the length of the lands of the threads to provide resilience in the thread helix for assembly and disassembly.
  • a set of cylindrical rock drill rod connections having continuous thread diameters of at least about 3.75 cm, said threads having a flank angle between about 50 said set including at least two connections in which the threads have different diameters,
  • pitch angle of the threads on all connections of the set regardless of diameter of the connection in the set is constant, and selected to fall between 6 and 8"
  • the pitch of the threads on the connections of the set, and of different diameter will vary in accordance with the diameter, and the connecting and disconnecting torques for the same flank angle of thread will be positioned along the same line in a diagram having these torques as coordinate axes, irrespective of thread diameter.

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)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
US00081769A 1969-10-22 1970-10-19 Connection thread system for sets of extension drill rods Expired - Lifetime US3717368A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE14444/69A SE336316B (fi) 1969-10-22 1969-10-22

Publications (1)

Publication Number Publication Date
US3717368A true US3717368A (en) 1973-02-20

Family

ID=20299120

Family Applications (1)

Application Number Title Priority Date Filing Date
US00081769A Expired - Lifetime US3717368A (en) 1969-10-22 1970-10-19 Connection thread system for sets of extension drill rods

Country Status (9)

Country Link
US (1) US3717368A (fi)
JP (1) JPS5021123B1 (fi)
CA (1) CA929368A (fi)
DE (1) DE2050703C3 (fi)
FI (1) FI56054C (fi)
FR (1) FR2066406A5 (fi)
NO (1) NO130737C (fi)
SE (1) SE336316B (fi)
ZA (1) ZA706679B (fi)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2800887A1 (de) * 1977-01-11 1978-07-13 Padley & Venables Ltd Aus loesbar miteinander verbundenen elementen bestehendes bohrgestaenge
US4295751A (en) * 1978-09-21 1981-10-20 Boart International Limited Thread structure for percussion drill elements
US4687368A (en) * 1985-04-04 1987-08-18 Santrade Limited Thread structure for percussion rock drilling
US4760887A (en) * 1985-01-07 1988-08-02 Santrade Limited Drill element for percussion drilling
US5032036A (en) * 1988-12-09 1991-07-16 Koyo Seiko Co., Ltd. Joint structure of annular member and shaft member
US6196598B1 (en) * 1997-01-06 2001-03-06 Boart Longyear, Inc. Straight hole drilling system
US20040055133A1 (en) * 2002-09-24 2004-03-25 Saha Pradip K. Low chamfer angled torque tube end fitting metal
US20060118340A1 (en) * 2002-05-22 2006-06-08 Patrik Wahlstrom Thread joint for a drill string for percussive rock-drilling
EP1762695A1 (en) * 2005-09-13 2007-03-14 Weatherford/Lamb Inc. Expansion activated anti-rotation device
US20090279947A1 (en) * 2008-05-07 2009-11-12 Dover Corporation (Canada) Ltd. Sucker rod
US20100140929A1 (en) * 2007-06-05 2010-06-10 Sandvik Intellectual Property Ab Rock-drilling equipment as well as female and male parts therefor
US20110132487A1 (en) * 2009-12-07 2011-06-09 Viega Gmbh & Co. Kg Tubular Component
US20170166144A1 (en) * 2015-12-14 2017-06-15 Yazaki Corporation Exterior member and wire harness

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5216024U (fi) * 1975-07-23 1977-02-04
JPS5250229U (fi) * 1975-10-06 1977-04-09
FI68293B (fi) * 1982-11-30 1985-04-30 Airam Ab Oy Foerfarande i laonghaolbergborrning och borrstaongsystem
DE102017212501A1 (de) 2017-07-20 2019-01-24 Robert Bosch Gmbh Kolbenpumpe, insbesondere Kraftstoff-Hochdruckpumpe für eine Brennkraftmaschine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1849066A (en) * 1929-07-03 1932-03-15 Dardelet Threadlock Corp Tight holding coupling
US3388935A (en) * 1964-05-29 1968-06-18 Sandvikens Jernverks Ab Threaded drill rod element
US3586353A (en) * 1969-01-13 1971-06-22 Howard I Lorenz Thread arrangement for earth boring members

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1849066A (en) * 1929-07-03 1932-03-15 Dardelet Threadlock Corp Tight holding coupling
US3388935A (en) * 1964-05-29 1968-06-18 Sandvikens Jernverks Ab Threaded drill rod element
US3586353A (en) * 1969-01-13 1971-06-22 Howard I Lorenz Thread arrangement for earth boring members

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4332502A (en) * 1977-01-11 1982-06-01 Padley & Venables Limited Apparatus for use in drilling
DE2800887A1 (de) * 1977-01-11 1978-07-13 Padley & Venables Ltd Aus loesbar miteinander verbundenen elementen bestehendes bohrgestaenge
US4295751A (en) * 1978-09-21 1981-10-20 Boart International Limited Thread structure for percussion drill elements
US4760887A (en) * 1985-01-07 1988-08-02 Santrade Limited Drill element for percussion drilling
US4687368A (en) * 1985-04-04 1987-08-18 Santrade Limited Thread structure for percussion rock drilling
US5032036A (en) * 1988-12-09 1991-07-16 Koyo Seiko Co., Ltd. Joint structure of annular member and shaft member
US6196598B1 (en) * 1997-01-06 2001-03-06 Boart Longyear, Inc. Straight hole drilling system
US8066307B2 (en) * 2002-05-22 2011-11-29 Atlas Copco Secoroc Ab Thread joint for a drill string for percussive rock-drilling
US20060118340A1 (en) * 2002-05-22 2006-06-08 Patrik Wahlstrom Thread joint for a drill string for percussive rock-drilling
US20040055133A1 (en) * 2002-09-24 2004-03-25 Saha Pradip K. Low chamfer angled torque tube end fitting metal
US6932118B2 (en) * 2002-09-24 2005-08-23 The Boeing Company Low chamfer angled torque tube end fitting metal
EP1762695A1 (en) * 2005-09-13 2007-03-14 Weatherford/Lamb Inc. Expansion activated anti-rotation device
US7591059B2 (en) 2005-09-13 2009-09-22 Weatherford/Lamb, Inc. Expansion activated anti-rotation device
US20070057508A1 (en) * 2005-09-13 2007-03-15 Weatherford/Lamb, Inc. Expansion activated anti-rotation device
US20100140929A1 (en) * 2007-06-05 2010-06-10 Sandvik Intellectual Property Ab Rock-drilling equipment as well as female and male parts therefor
US8262139B2 (en) * 2007-06-05 2012-09-11 Sandvik Intellectual Property Ab Rock-drilling equipment as well as female and male parts therefor
US20090279947A1 (en) * 2008-05-07 2009-11-12 Dover Corporation (Canada) Ltd. Sucker rod
US8141630B2 (en) * 2008-05-07 2012-03-27 Dover Corporation (Canada) Ltd. Sucker rod string
US20110132487A1 (en) * 2009-12-07 2011-06-09 Viega Gmbh & Co. Kg Tubular Component
US8770230B2 (en) * 2009-12-07 2014-07-08 Viega Gmbh & Co. Kg Tubular component
US20170166144A1 (en) * 2015-12-14 2017-06-15 Yazaki Corporation Exterior member and wire harness
US10166937B2 (en) * 2015-12-14 2019-01-01 Yazaki Corporation Exterior member and wire harness

Also Published As

Publication number Publication date
FI56054C (fi) 1979-11-12
FR2066406A5 (fi) 1971-08-06
FI56054B (fi) 1979-07-31
DE2050703B2 (de) 1980-05-14
JPS5021123B1 (fi) 1975-07-21
DE2050703C3 (de) 1981-01-22
CA929368A (en) 1973-07-03
ZA706679B (en) 1971-05-27
SE336316B (fi) 1971-07-05
NO130737C (no) 1977-11-01
AU2133770A (en) 1972-04-27
NO130737B (fi) 1974-10-21
DE2050703A1 (de) 1971-05-06

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