EP4403740A1 - Raccord fileté - Google Patents

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Publication number
EP4403740A1
EP4403740A1 EP23152004.0A EP23152004A EP4403740A1 EP 4403740 A1 EP4403740 A1 EP 4403740A1 EP 23152004 A EP23152004 A EP 23152004A EP 4403740 A1 EP4403740 A1 EP 4403740A1
Authority
EP
European Patent Office
Prior art keywords
thread
threaded
threaded bushing
bushing
ellipses
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.)
Granted
Application number
EP23152004.0A
Other languages
German (de)
English (en)
Other versions
EP4403740C0 (fr
EP4403740B1 (fr
Inventor
Frank GÖCKE
Tobias Klein
Dieter Wurm
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.)
Tracto Technik GmbH and Co KG
Original Assignee
Tracto Technik GmbH and Co KG
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 Tracto Technik GmbH and Co KG filed Critical Tracto Technik GmbH and Co KG
Priority to PL23152004.0T priority Critical patent/PL4403740T3/pl
Priority to EP23152004.0A priority patent/EP4403740B1/fr
Priority to US18/398,382 priority patent/US20240247553A1/en
Priority to AU2024200253A priority patent/AU2024200253A1/en
Publication of EP4403740A1 publication Critical patent/EP4403740A1/fr
Application granted granted Critical
Publication of EP4403740C0 publication Critical patent/EP4403740C0/fr
Publication of EP4403740B1 publication Critical patent/EP4403740B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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

Definitions

  • the invention relates to a threaded bushing, a use of a threaded bushing, a use of a threaded plug and a threaded connection with a threaded bushing and a threaded plug, in particular relating to a rod section for an earth drilling device.
  • earth drilling device refers to devices with which the drive power of a drive device is transmitted via a rod to a tool that is arranged on a rod, in particular at the end.
  • This includes in particular earth drilling devices with which earth bores and in particular horizontal bores are made in the ground.
  • the drive device usually transmits thrust or pressure forces via the rod to the tool designed as a drill head. It is also possible for a rotary movement to be imposed on the rod about its longitudinal axis by means of the earth drilling device.
  • existing bores in the ground or old pipes that have already been laid can be widened or pulled out and, if necessary, a new pipe can be pulled in at the same time.
  • the earth drilling devices are often designed in such a way that they can be used both for creating earth bores and for pulling work, i.e. for widening an existing bore or an old pipe or for pulling in a new pipe.
  • This makes it possible to first create a pilot bore using the same earthmoving device, whereby a pilot drill head is pushed through the soil until it reaches a target excavation pit, and the pilot drill head is pushed into the target excavation pit by an expander head, whereby the pilot bore is expanded when the drill rod is pulled back. If necessary, a new pipe attached to the expander head can be pulled into the expanded borehole at the same time as the expander head.
  • the rods of such earthwork devices usually consist of a number of rod sections, which are gradually connected to one another in accordance with the drilling advance.
  • the individual rod sections are connected via coupling elements, whereby in addition to plug-in couplings, as in DE 196 08 980 described, particularly screw connections are widespread.
  • the main advantages of screw connections are the low costs associated with their production and the possibility of having the screwing carried out easily and automatically.
  • a major disadvantage of screw connections, however, is that they often represent the greatest weak points of the rod, which is due to the relatively small diameter in the area of the threaded plug of the threaded connection and the geometrically high notch effect of the thread itself.
  • API threads and round threads according to DIN 20 400 are also known. However, the service life of such thread forms has proven to be too short in the daily operation of earth drilling devices.
  • DE 198 03 304 A1 discloses a threaded connection with which rod sections of a drill rod are to be connected, whereby the drill rod is to be used in particular for rotary percussion drilling.
  • the main features of these threaded connections are the asymmetrical shape of the thread with different pitch angles of the load-bearing and non-load-bearing flanks in rotary percussion drilling operation, as well as the provision of a threadless insertion section.
  • the non-load-bearing flanks are also to be circularly arc-shaped.
  • the known threaded connection has proven to be insufficiently robust in daily operation.
  • Threaded connections for rods of earth drilling devices are known in which the thread root forms a section of an ellipse.
  • the thread shapes disclosed in this publication can be both asymmetrical and symmetrical.
  • the invention was therefore based on the object of creating a threaded connection which in particular facilitates the formation and release of the connection and whose service life is impaired as little as possible or not at all.
  • the idea of only having to take into account a reduction in the notch effect and of wanting to achieve a more homogeneous stress distribution was abandoned, which is why an elliptical shape was previously provided at the thread base, whereby the stress maxima occur less in the thread base than in the area of the flanks.
  • the preferred thread shape had been assumed to be a simple elliptical shape, as this has a positive effect on the service life of the thread connection, as there is usually no geometric notch in the area of the flanks and the notch effect in the thread base is thereby reduced.
  • the geometry of the threaded bushing was changed in such a way that adjacent flanks of the thread are predetermined by a shift of an ellipse. This makes it possible to improve the sliding properties when screwing the screw connection, whereby the advantageous properties of an elliptical shape can be used or retained. Damage to the thread due to shearing or impaired thread guidance, which is colloquially referred to as cold welding of the thread flanks, can be counteracted.
  • the shape of the thread can be increased by shifting adjacent thread flanks that are part of a section of an ellipse, whereby the elliptical shape that has proven to be advantageous is retained with a significant change in the offset of the adjacent flanks.
  • the invention provides a threaded bushing on an elongated body for a threaded connection with a threaded plug, wherein the threaded bushing has a conical internal thread in which adjacent flanks of the internal thread are formed as sections of two identical ellipses offset from one another.
  • cylindrical (internal) thread includes a design of the thread such that the thread roots and/or the thread tips of the threaded plug or the threaded bushing define a casing or are arranged on a casing that has a conical shape. This allows the threaded plug to be screwed onto the threaded bushing quickly and easily, with both the threaded plug and the threaded bushing preferably having a conical thread.
  • the angle that the casing, on which the thread roots and/or thread tips lie, encloses with a line parallel to the longitudinal axis of the threaded plug or the threaded bushing can preferably be in the range between 2° and 10°, in particular 3° and 8°, more preferably 3° and 7°.
  • flank of the thread essentially includes the section of the thread between the thread root and the thread crest. Since the shape of the flank has a curved course due to its design as an elliptical section, the assignment of the areas of the "thread root” and the "thread crest” does not necessarily have to be reduced to a point, as would be the case with a thread whose flanks are designed as straight lines. In particular, the area from a turning point can be assigned to the thread crest, so that the flank has the section of a pure elliptical shape, whereby the area from the turning point can be designed small.
  • Parts of the thread root or the entire thread root can be designed as section(s) of one of the two ellipses or both ellipses.
  • a shape other than an elliptical section can also be provided for the thread root, which adjoins the flank in the direction of the thread root.
  • flank as a section of an ellipse takes place in the sense of the description over a significant height between the thread base and the thread crest.
  • the area around the, in particular geometric, center between the thread base and the thread crest can be designed as a section of the ellipse.
  • the section of the ellipse can continue in both directions over a height that is between 0.2 times and 0.5 times the distance from the thread base to the thread crest.
  • the height at which the section of the ellipse can extend between the thread base and the thread crest can be selected to be identical for the thread of the threaded bushing or the threaded plug; in a particularly preferred embodiment, the height at which the section of the ellipse can extend between the thread base and the thread crest is different for the threaded plug and the threaded bushing of a rod shot system. from each other.
  • the height at which the section of the ellipse can extend between the thread root and thread tip of a threaded plug and a threaded bushing of a rod shot system can be different for the threaded plug and the threaded bushing.
  • the height at which the section of the ellipse extends between the thread root and thread tip in the case of a threaded plug is in the range from 0.5 to 0.9, preferably in the range from 0.6 to 0.9, preferably in the range from 0.7 to 0.9, very particularly preferably in the range from 0.75 to 0.85, of the distance between the thread root and thread tip. It can be provided that the height at which the section of the ellipse extends between the thread root and thread tip in the case of a threaded bushing is in the range from 0.5 to 0.8, preferably in the range from 0.6 to 0.7, very particularly preferably in the range from 0.63 to 0.68, of the distance between the thread root and thread tip.
  • the thread root can also be formed at least partially as part of the ellipse or the ellipse can extend into the thread root
  • the height at which the section of the ellipse extends from the center between the thread root and the thread tip in the direction of the thread root can be up to 0.5 times the distance between the thread root and the thread tip. Since a rounding is preferably provided for the thread tip, the respective height over which the elliptical shape of the thread extends from the center between the thread root and the thread tip in the direction of the thread tip can be less than 0.5 times the distance between the thread tip and the thread root.
  • the height of the extension of the section of the ellipse from the center between the thread root and the thread tip in the direction of the thread root is greater than the height of the extension from the center between the thread root and the thread tip in the direction of the thread tip, in particular it can be provided that the section of the ellipse for a threaded plug can extend into the thread root.
  • adjacent flanks includes the two flanks that are connected to one another by means of exactly one thread root arranged between them.
  • adjacent flanks can be used synonymously for "two directly consecutive flanks of the thread that are connected to one another by means of a thread root arranged between the flanks”.
  • the two adjacent flanks of the thread can be divided into a load-bearing flank and a non-load-bearing flank.
  • the load-bearing flank is responsible for the transmission of force from the threaded plug to the threaded bushing.
  • flank(s) is/are formed as a section of an ellipse, then in the sense of the description in a preferred embodiment This means that the flank has exactly one section of an ellipse and no other shape.
  • the shape of the thread root and the thread crest are independent of this, such as a rounding in the area of the thread crest and a change in shape in the area of the thread root.
  • oval in the sense of the description includes the closed oval curve, usually resulting from a conic section, which has a center point and the major and minor axes passing through the center point.
  • the shape of the thread is examined in the sense of the description in a sectional view in which the threaded bushing is cut by a cutting plane that intersects the longitudinal axis of the elongated body or is contained in the cutting plane.
  • the term "height" or "thread height” to describe the thread includes the specification of a length or distance or spacing based on the cutting plane for viewing the thread, in a direction essentially perpendicular to the longitudinal axis of the elongated body. The total height can result from a distance between the thread root and the thread crest. To describe the extension of the thread over the course between the thread root and the thread crest, the height over which the section of the ellipse of one of the flanks extends from the center between the thread root and the thread crest in the direction of the thread root or the thread crest can be specified.
  • offset or the adjectivally used term “offset” in relation to the two identical ellipses comprises, within the meaning of the description, a spatial displacement of one of the two ellipses in relation to the other, wherein in particular at least a portion of the spatial displacement is present in a direction parallel to the longitudinal axis of the elongated body.
  • the threaded bushing can be braced against a shoulder on the threaded plug.
  • the threaded plug and threaded bushing can be brought into contact with each other with their end faces, so that a force screw connection is made between an end face of the shoulder and the supporting flanks, in particular those in the area near the shoulder.
  • the shoulder or the end face on the threaded plug can alternatively or additionally serve as a maximum stop for the screw connection.
  • Axial forces and/or torsional moments can also be transmitted by means of the shoulder or the end face(s).
  • the face angle of the face surfaces of the threaded plug and the threaded bushing, which can come into contact with each other is in the range from 65° to 85°, particularly preferably in the range from 70° to 80°. Most preferably, the face angle of the face surfaces of the threaded plug and the threaded bushing, which can come into contact with one another, can be 75°.
  • rod section in the sense of the description includes individual, in particular rigid, rod sections that can be connected to one another directly or indirectly and that can be connected to one another in the longitudinal axial direction to form a drill rod or a drill string.
  • the rod sections can be screwed together with a threaded plug to connect them to one another with the mechanical interposition of an intermediate element or without the interposition of an intermediate element using a threaded bushing as described.
  • a rod section does not necessarily have to have an element for screwing at both longitudinal ends, so that it is possible for the rod section to have i) a threaded bushing at one longitudinal end and a threaded plug at the other longitudinal end, ii) a threaded bushing at each of the longitudinal ends, iii) a threaded bushing at one longitudinal end and a different type of coupling element at the other longitudinal end.
  • drill string in the sense of the description includes several interconnected rod sections.
  • a bore can be drilled using a drill string, which can have a drill head at its front end and, if present, a drill head tip that can be designed as a drilling tool (for example, as an expander head).
  • earth drilling device in the sense of the description includes a (and thus any) device which can move in particular a drill string with rod sections in an existing channel or a channel to be created, in particular in the ground, in order to create or widen a bore, in particular a horizontal bore (HD), or to pull pipelines or other long bodies into the ground.
  • the earth drilling device can in particular be an HD device.
  • An earth drilling device can be a device that drives a drill string and can in particular work by displacing soil.
  • the drill string can be introduced into the ground in a translatory and/or rotary manner in the longitudinal axial direction of the drill string.
  • the drill string can be moved in the ground by applying tension or pressure and, if necessary, also in a rotary or rotating manner.
  • driver element in the sense of the description includes an element arranged on the earth drilling device, which is designed to be connected to a drill string or a rod section of the drill string in order to to exert a translational and/or rotational force on the drill string.
  • a rod section to be connected to the drill string is brought into engagement with the drive element in order to then connect the rod section connected to the drive element to the already drilled drill string.
  • the ellipses offset from one another are standing ellipses.
  • a simple construction can be achieved in which the flank(s) can run out into the area of the thread root in order to reduce the notch effect there.
  • a "standing ellipse” is understood to mean an ellipse whose main axis (i.e. the longer of the central axes) forms a larger angle with the central axis of the threaded plug or threaded bushing than its secondary axis (i.e. the shorter central axis).
  • the angle between the main axis of the ellipse and the central axis of the threaded plug or threaded bushing can be "corrected" for a possible inclination of the ellipse, which can be caused by an arrangement of the ellipse on a cone of the threaded plug or threaded bushing, preferably between 70° and 110°, preferably between 80° and 100°, and particularly preferably 90° in the case of a standing ellipse, although deviations from this can arise, for example, due to tolerances during production.
  • a central axis of at least one of the two ellipses, in particular the main axis is arranged perpendicular to the longitudinal axis of the elongated body.
  • This enables a particularly simple construction.
  • both central axes of the two ellipses, in particular the main axis in each case are arranged perpendicular to the longitudinal axis of the elongated body.
  • At least one of the thread crests of the adjacent flanks is rounded, whereby sharp transitions in the thread can be reduced or avoided. Most preferably, both thread crests are rounded.
  • the thread root between the adjacent flanks is formed as an envelope of the two ellipses, resulting in a geometry of the thread root that reduces the notch effect and also enables a simple construction.
  • envelope is understood in the sense of the description to mean a curve that results from a continuous connection of the two ellipse sections in the The thread root is formed at the intersection of the two ellipses, whereby the envelope can be rounded in the area of the intersection of the two ellipses.
  • the construction of the thread is simplified, and the notch effect in the thread root is counteracted by the geometric design.
  • the offset includes at least one translational displacement in the direction of the longitudinal axis of the threaded bushing, the extent of which is between 1/8 and 1/4 of the thread height. It was surprisingly found that the extent of the translational displacement can be dependent on the dimension of the thread height in order to create a screw connection with suitable properties with regard to low stress concentration and easy screwing. Very good results were achieved in the range mentioned.
  • the offset includes at least one translational shift in the direction of the longitudinal axis of the threaded bushing, the extent of which is between 1/10 and 3/10 of the distance between two adjacent thread roots.
  • the offset can have at least one translational shift in the direction of the longitudinal axis of the threaded bushing, the extent of which is between 17/100 and 25/100 of the distance between two adjacent thread roots. It was surprisingly found that the extent of the translational shift can depend on the extent of the distance between two adjacent thread roots in order to enable a screw connection with suitable properties with regard to low notch effect and easy screwing. Very good results were achieved in the range mentioned.
  • the offset includes at least one translational shift in the direction of the longitudinal axis of the threaded bushing, the extent of which is between 1/10 and 2/10 of the quotient of the major axis and minor axis of the identical ellipses, wherein the offset preferably includes at least one translational shift in the direction of the longitudinal axis of the threaded bushing, the extent of which is between 12/100 and 15/100 of the quotient of the major axis and minor axis of the identical ellipses. It was surprisingly found that the extent of the translational shift can depend on the value of the quotient of the central axes of the ellipses in order to enable a screw connection with suitable properties with regard to low notch effect and easy screwing. Very good results were achieved in the range mentioned.
  • the offset of the two elliptical sections is a pure translation in the direction of the longitudinal axis of the threaded bushing. This allows the design of the thread to be greatly simplified.
  • the longitudinal axis of the threaded bushing is usually coincident with the longitudinal axis of the elongated body.
  • the terms can essentially be used synonymously, although the use of one term may be preferred over the other depending on the context.
  • the elongated body is a rod section of a drill string for an earth drilling device or a drive element for a rod section of a drill string of an earth drilling device.
  • the invention also provides a use of a threaded bushing on an elongated body for a threaded connection with a threaded plug, wherein the threaded plug has an external thread applied to a core, in which adjacent flanks of a thread of the threaded plug form sections of the same ellipse, wherein a thread is used as the internal thread of the threaded bushing, in which adjacent flanks of the internal thread are formed as sections of two identical ellipses offset from one another.
  • the invention also provides a use of a threaded plug on an elongated body for a threaded connection with a threaded bushing, wherein the threaded bushing has an internal thread in which adjacent flanks of the internal thread are formed as sections of two identical ellipses offset from one another, wherein the threaded plug has an external thread applied to a core in which adjacent flanks of a thread of the threaded plug form sections of the same ellipse.
  • the elongated body can also be a rod section of a drill string for an earth drilling device or a drive element for a rod section of a drill string of an earth drilling device.
  • the invention also provides a threaded connection comprising a threaded bushing described in the present description and a threaded plug on an elongated body, wherein the threaded plug has an external thread applied to a core, in which adjacent flanks of a thread of the threaded plug form sections of the same ellipse.
  • the descriptions of the individual designs or aspects complement each other.
  • the statements regarding the threaded bushing can also apply to the aspect of "use”.
  • the statements regarding the geometry of the thread, the elongated body connected to it, a rod section and the like also apply to the aspect of a threaded connection in which, in addition to the threaded bushing described, there is also a threaded plug on an elongated body, the threaded plug having an external thread applied to a core, in which adjacent flanks of a thread of the threaded plug form sections of the same ellipse.
  • the threaded bushing can also work together with other threaded plugs to a certain extent, in which adjacent flanks are not necessarily designed to correspond or complement each other. It has been recognized that a design of the threaded plug adapted to the design of the described threaded bushing in the design described in the present description can be preferred. It has also surprisingly been shown that a design of the threaded plug in which adjacent flanks form a section of one and the same ellipse can lead to a further improvement in the thread.
  • the ellipse that forms adjacent flanks of the thread of the threaded plug, at least in sections, is identical to the two ellipses of the threaded bushing. A simple construction of the threads is possible.
  • the thread base of the threaded plug can also form a section of the ellipse. This can also reduce a notch effect in the threaded plug.
  • the thread pitch of the threaded bushing and/or the threaded plug is between 5 mm and 9 mm, preferably 7 mm.
  • the cutting angle is between 20° and 30°.
  • the cutting dimension of the threaded plug is at least 0.5 mm.
  • the cutting dimension of the threaded bushing is at least 1 mm.
  • the difference between the length of the threaded plug and the threaded bushing is at most 0.5 mm.
  • Figure 1 shows in the right of the two representations a section of an elongated body 1 with a threaded bushing 2 with an internal thread 3 in a sectional view.
  • the threaded bushing 2 is located at the end of the elongated body 1, which is designed as a rod section of a drill string for an earth drilling device or a drive element for a rod section of a drill string of an earth drilling device.
  • the right of the two representations of the Figure 1 is a sectional view of the left representation of the Figure 1 along AA.
  • the left of the two representations of the Figure 1 shows a view of the threaded bushing 2 of the elongated body 1 in the longitudinal direction of the elongated body 1.
  • the elongated body 1 has a longitudinal axis L.
  • the internal thread 3 of the threaded bushing 2 is a conical internal thread.
  • the internal thread 3 of the threaded bushing 2 is shown in an enlarged view in the Figure 2 shown.
  • Figure 2 shows the internal thread 3 of the Figure 1 in an enlarged view.
  • the adjacent flanks between two thread crests GS are formed as sections of two identical ellipses E1, E2 offset from each other.
  • the Figure 2 shows the thread height designated GH between thread crest GS and thread root GG.
  • the thread crest GS is positioned centrally between two adjacent flanks.
  • the thread root GG is positioned centrally between two adjacent flanks.
  • Figure 3 shows in the right of the two representations a section of an elongated body 1 with a threaded plug 4 with an external thread 5 in a sectional view.
  • the threaded plug 4 is located at the end of the elongated body 1, which is designed as a rod section of a drill string for an earth drilling device or a drive element for a rod section of a drill string of an earth drilling device.
  • the right of the two representations of the Figure 3 is a sectional view of the left representation of the Figure 3 along AA.
  • the left of the two representations of the Figure 3 shows a view of the threaded plug 4 of the elongated body 1 in the longitudinal direction of the elongated body 1.
  • the elongated body 1 has a longitudinal axis L.
  • the external thread 5 of the threaded plug 4 is a conical external thread.
  • the external thread 5 of the threaded plug 4 is shown in an enlarged view in the Figure 4 shown.
  • Figure 4 shows the external thread 5 of the Figure 3 in an enlarged view.
  • the adjacent flanks between two thread crests GS are formed as a section of an ellipse E3.

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  • 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)
EP23152004.0A 2023-01-17 2023-01-17 Raccord fileté Active EP4403740B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PL23152004.0T PL4403740T3 (pl) 2023-01-17 2023-01-17 Połączenie gwintowane
EP23152004.0A EP4403740B1 (fr) 2023-01-17 2023-01-17 Raccord fileté
US18/398,382 US20240247553A1 (en) 2023-01-17 2023-12-28 Threaded connection
AU2024200253A AU2024200253A1 (en) 2023-01-17 2024-01-15 Threaded connection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23152004.0A EP4403740B1 (fr) 2023-01-17 2023-01-17 Raccord fileté

Publications (3)

Publication Number Publication Date
EP4403740A1 true EP4403740A1 (fr) 2024-07-24
EP4403740C0 EP4403740C0 (fr) 2025-10-15
EP4403740B1 EP4403740B1 (fr) 2025-10-15

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EP23152004.0A Active EP4403740B1 (fr) 2023-01-17 2023-01-17 Raccord fileté

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US (1) US20240247553A1 (fr)
EP (1) EP4403740B1 (fr)
AU (1) AU2024200253A1 (fr)
PL (1) PL4403740T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4650561A1 (fr) * 2024-05-15 2025-11-19 Sandvik Mining and Construction Tools AB Fond de panier d'ellips incliné

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5060740A (en) 1990-05-29 1991-10-29 Sandvik Rock Tools, Inc. Screw thread coupling
EP0324442B1 (fr) 1988-01-11 1992-03-18 Sandvik Rock Tools Inc. Profil de filet elliptique
DE69103090T2 (de) * 1990-05-29 1994-11-17 Sandvik Ab Schraubengewindekonstruktion.
DE19608980A1 (de) 1996-03-08 1997-09-11 Tracto Technik Vorrichtung zum Bohren im Erdreich
DE19803304A1 (de) 1997-05-29 1998-12-03 Boart Hwf Gmbh Co Kg Bohrgestänge zum Drehschlagbohren, insbesondere zum Überlagerungsbohren
WO2006092649A1 (fr) 2005-03-02 2006-09-08 Vallourec Mannesmann Oil & Gas France Raccordement de masse-tige
DE102008047060A1 (de) * 2008-09-12 2010-03-18 Tracto-Technik Gmbh & Co. Kg Gewindeverbindung
US20130147191A1 (en) * 2011-12-09 2013-06-13 Gastón Mauro Mazzaferro Threaded Connection With Improved Root Thread Profile
US10145496B2 (en) * 2014-06-13 2018-12-04 Schlumberger Technology Corporation Rotary shouldered connections and thread design

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0324442B1 (fr) 1988-01-11 1992-03-18 Sandvik Rock Tools Inc. Profil de filet elliptique
US5060740A (en) 1990-05-29 1991-10-29 Sandvik Rock Tools, Inc. Screw thread coupling
DE69103090T2 (de) * 1990-05-29 1994-11-17 Sandvik Ab Schraubengewindekonstruktion.
DE19608980A1 (de) 1996-03-08 1997-09-11 Tracto Technik Vorrichtung zum Bohren im Erdreich
DE19803304A1 (de) 1997-05-29 1998-12-03 Boart Hwf Gmbh Co Kg Bohrgestänge zum Drehschlagbohren, insbesondere zum Überlagerungsbohren
WO2006092649A1 (fr) 2005-03-02 2006-09-08 Vallourec Mannesmann Oil & Gas France Raccordement de masse-tige
DE102008047060A1 (de) * 2008-09-12 2010-03-18 Tracto-Technik Gmbh & Co. Kg Gewindeverbindung
EP2334892B1 (fr) 2008-09-12 2017-02-22 TRACTO-TECHNIK GmbH & Co. KG Raccordement fileté
US20130147191A1 (en) * 2011-12-09 2013-06-13 Gastón Mauro Mazzaferro Threaded Connection With Improved Root Thread Profile
US10145496B2 (en) * 2014-06-13 2018-12-04 Schlumberger Technology Corporation Rotary shouldered connections and thread design

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4650561A1 (fr) * 2024-05-15 2025-11-19 Sandvik Mining and Construction Tools AB Fond de panier d'ellips incliné

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AU2024200253A1 (en) 2024-08-08
US20240247553A1 (en) 2024-07-25
PL4403740T3 (pl) 2026-02-16
EP4403740C0 (fr) 2025-10-15
EP4403740B1 (fr) 2025-10-15

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