US20130098689A1 - Two-part drilling tool for the percussive or rotary percussive drilling of holes in soil material or rock material - Google Patents

Two-part drilling tool for the percussive or rotary percussive drilling of holes in soil material or rock material Download PDF

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Publication number
US20130098689A1
US20130098689A1 US13/639,599 US201113639599A US2013098689A1 US 20130098689 A1 US20130098689 A1 US 20130098689A1 US 201113639599 A US201113639599 A US 201113639599A US 2013098689 A1 US2013098689 A1 US 2013098689A1
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US
United States
Prior art keywords
adapter
drill head
drilling tool
thread
wedge
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.)
Abandoned
Application number
US13/639,599
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English (en)
Inventor
Walter Karpeilus
Karl Böhm
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.)
DYWIDAG-SYSTEMS INTERNATIONAL GmbH
Dywidag Systems International GmbH Austria
Original Assignee
Dywidag Systems International GmbH Austria
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 Dywidag Systems International GmbH Austria filed Critical Dywidag Systems International GmbH Austria
Assigned to DYWIDAG-SYSTEMS INTERNATIONAL GMBH reassignment DYWIDAG-SYSTEMS INTERNATIONAL GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BOHM, KARL, KARPELLUS, WALTER
Publication of US20130098689A1 publication Critical patent/US20130098689A1/en
Abandoned 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
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • 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
    • E21B10/36—Percussion drill bits
    • 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
    • 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 a two-part drilling tool for the percussive or rotary percussive drilling of holes in soil material or rock material, including a drill head and an adapter part, which is fixed in an interior of the drill head by way of interacting, complementary threads and is intended for providing the coupling to a drill string, wherein an end face of the drill head that is remote from a borehole interior rests on a complementarily formed stop or support surface of the adapter part.
  • Drilling tools for the percussive or rotary-percussive drilling of holes in soil or rock material are known in various configurations and for the most diverse purposes of use, wherein, in recent times, drill bits have frequently been employed, part of which, i.e. the so-called ring drill bit, will remain in the borehole after completion of the latter, or so-called lost drill bits have been used, which will completely remain in the borehole upon completion thereof.
  • a relatively soft material is usually used for such drill bits either for the whole, or for at least part of, the ring drill bit, which will frequently entail problems when detaching and retracting the drill string, or an adapter connected to the drill string, upon completion of a borehole due to material deformations in the region of the connection of the drill head, or the drill bit, and the adapter or the rock-side end of the drill string.
  • various types of connections such as those described, for instance, in DE-A 25 43 578 or U.S. Pat. No. 2,052,011 have already been described, yet none of those connections provide sufficient lifetimes during percussive or rotary-percussive drilling.
  • a two-part drill bit has become known, in which a drill head interacts with an adapter inserted in the drill bit via a thread, wherein the two parts comprise mutually different threads that are designed to safely absorb bending moments during drilling.
  • the invention aims to provide a threaded connection between a lost drill bit, or a drill head, and an adapter, which ensures both a sufficient lifetime for the formation of a borehole and, upon completion of the drilling procedure, can be reliably detached in order to enable the safe and reliable recovery of reusable elements such as the drill rod and/or an adapter including a drill rod fixed thereto.
  • the two-part drilling tool according to the invention is characterized in that the end face of the drill head that is remote from the borehole interior and the stop or support surface of the adapter part interacting therewith are configured as complementarily formed wedge-shaped surfaces with end teeth, wherein, in the main, the wedge-shaped surfaces take up the impact stress and the end faces take up the torques, and that the lead angle of the wedge-shaped surfaces is smaller than the lead angle of the internal thread of the drill head, or the external thread interacting therewith of the adapter part.
  • the lead angle of the wedge-shaped surfaces is smaller than the lead angle of the internal thread of the drill head, or the external thread of the adapter part interacting therewith, the relief of the thread in the axial direction will be safeguarded, since the impact stress will above all be applied to the wedge-shaped surfaces, and the surfaces of the interacting threads that are particularly vulnerable to excessive wear, namely the surface of the thread facing the mine interior on the adapter and the surface facing the mine exterior of the drill bit, or the drill head, respectively, will be substantially kept free from any impact stress in the axial direction.
  • Such a configuration will further ensure the adapter to be safely and reliably detached from the drill bit upon completion of a drilling procedure so as to avoid excessive material expenditures and, in particular, the loss of the adapter.
  • the two-part drilling tool is configured such that the lead angle of the wedge-shaped surfaces is at least 10% and at most 50%, in particular about 25%, smaller than the lead angle of the internal and external threads. Due to a markedly reduced lead angle of the wedge-shaped surface relative to that of the internal thread of the drill head and the external thread of the adapter, lifts automatically the drill head when screwing the adapter into the drill head so as to automatically provide a certain play of the thread of the adapter in the internal thread of the drill head, thus keeping the threaded connection between the drill head and the adapter substantially free from axial forces during a drilling procedure.
  • the invention is preferably further developed such that thread roots of the complementary threads of the drill head and the adapter each extending in the axial direction of the two-part drilling tool in the axial direction of the two-part drilling tool have dimensions exceeding those of the thread heads.
  • the thread root each has a larger longitudinal extension in the axial direction of the two-part drilling tool than the respective thread head engaging the thread root, the respective thread head will be kept completely free from axial loads whenever stress is exerted on the two-part drilling tool, and it will thereby be prevented that the complementary threads and, in particular, the internal thread of the drill head, which is usually made of a softer material, will be knocked out or rounded off by excessive loads during the drilling procedure and will no longer be detachable upon completion of the drilling procedure.
  • the thread root exceeds the dimension of the thread head in the axial direction of the two-part drilling tool by at least one third of the height of the end teeth, not only the keeping-free of the complementary threads of any axial load will be ensured, but it will also be safeguarded that the free space between the thread head and the thread root will be sufficiently small so as not to be subjected to undesired bending moments during the drilling procedure and, be additionally contaminated by introduced rock residues to such an extent as to render impossible the detachment upon completion of the drilling procedure.
  • the invention is preferably devised such that the end faces of the adapter and the stop or support surface of the drill head each comprise at least one, in particular at least three, wedge-shaped surface(s) with end teeth.
  • the reliable transmission of the impact energy on the drill head will be feasible without stressing the threads of the drill head and the adapter in the axial direction.
  • the safe transmission of the rotational movement of the drill string on the drill head will, on the one hand, be feasible and, on the other hand, securement against screwing the adapter too far into the drill head will be provided.
  • the slope of the wedge-shaped surfaces in this case is selected such that the resulting longitudinal extension of the end teeth in the axial direction is so large that even with the highest rotating loads, or highest bending moments, sufficiently large support surfaces of end teeth formed on the drill head and on the adapter will be provided so as to ensure the safe and reliable transmission of the necessary torques while, at the same time, prevent excessive wear of the end teeth.
  • the wedge-shaped surfaces of the adapter are case-hardened, it will be safeguarded that the wedge-shaped surfaces, which are especially stressed and transmit the impact energy, will be secured against knocking-out and wearing.
  • the wedge-shaped surfaces of the adapter are case-hardened, the reutilization of this or these element(s) upon completion of a drilling procedure in subsequent drilling procedures will be ensured.
  • the wedge-shaped surfaces and the end teeth of the adapter are case-hardened, any highly-stressed elements of the adapter will be secured against premature wear.
  • the end teeth are case-hardened, not only the transmission of very high torques will be ensured but, above all, also the knocking-out of the extremely loaded regions of the end teeth will be avoided.
  • the configuration according to the invention is preferably further developed such that approximately semicircular recesses are each formed in the region of the end teeth, both in the adapter and in the stop or support surface of the drill head.
  • the two-part drilling tool according to the invention is preferably further developed such that the internal thread of the drill head and the complementary external thread of the adapter interacting therewith are designed as single-flight threads.
  • single-flight threads it will be possible, even in the event of extreme contaminations and, for instance, the introduction of viscous or solidifying drilling mud, to safely detach the thread upon completion of the drilling procedure, and hence safely and reliably remove from the lost drill bit the elements intended for further use, namely the drill string and optionally an adapter for fixing the drill string.
  • the two-part drilling tool according to the invention is, moreover, configured such that the respective turns of the threads of the drill head and the adapter extend over at least 75% and at most 99% of the circumferences of the adapter and the drill head, a safe connection of the drill head with the adapter will, on the one hand, be ensured, and it will, on the other hand, be safe-guarded that said connection will be reliably detachable even after extreme loads and/or contaminations.
  • the complementary threads are designed as flat threads or trapezoidal threads having flank angles smaller than 25°.
  • Flat threads or trapezoidal threads in a manner known per se are able to absorb high axial loads, and, on the other hand, will provide the play or free space that is required between a thread root and a respectively meshing thread head, in order to achieve the preferred characteristic features sought by the invention.
  • FIG. 1 is an external view of a two-part drilling tool according to the invention in the position during the percussive or rotary-percussive drilling of holes in soil or rock material;
  • FIG. 2 depicts a longitudinal section along line A-A of FIG. 1 , of the two-part drilling tool according to FIG. 1 ;
  • FIG. 3 is an enlarged view of the detail B of FIG. 2 , indicating the alternate positions of the internal thread of the drill head and the external thread of the adapter in the state during drilling;
  • FIG. 4 again depicts a longitudinal section through the two-part drilling tool, said two-part drilling tool being illustrated in the position during the screwing of the adapter into the drill head;
  • FIG. 5 depicts a longitudinal section through the two-part drilling tool according to the invention in the operating state during the retraction of the drill string and the rotation of the same to the left in order to perform the rotational movement of a drill head during rotary percussive drilling;
  • FIG. 6 is an external view of the two-part drilling tool in the position according to FIG. 5 ;
  • FIG. 7 illustrates a section through the adapter, showing the lead angles of the wedge-shaped surfaces and the thread, respectively.
  • FIG. 1 illustrates a drill head 1 , in particular a so-called lost drill bit 1 , which is formed with wedge-shaped surfaces 4 and end teeth 5 on its end side 3 that faces away from the excavation tools 2 .
  • the wedge-shaped surfaces 4 are configured to be in abutment on complementary wedge-shaped surfaces 6 of an adapter 7 during the drilling of holes in soil and/or rock materials, and via which wedge-shaped surfaces 4 and 6 the impact energy is applied to the drill head 1 via the adapter 7 .
  • the adapter 7 in addition to the wedge-shaped surfaces 6 comprises end teeth 8 , which abut on the complementary end teeth 5 of the drill head 1 during drilling and, in particular, during the application of a torque during rotary percussion drilling, and which absorb, and withstand, torques applied to the two-part drilling tool.
  • substantially semicircular recesses 9 and 10 are respectively formed in the drill head 1 and in the adapter 7 , which serve to take up excessive loads and to distribute the introduced energy, thus safely preventing the tearing off or knocking-out of the end teeth 5 and 8 .
  • FIG. 2 which shows a section along line A-A of FIG. 1 , the reference numerals of FIG. 1 have been retained.
  • a single-flight thread 11 is formed, which is configured such that a thread root 12 has a larger longitudinal extension in the axial direction of the two-part drilling tool than a thread head 13 interacting with said thread root 12 , of the thread 14 of the adapter 7 , which engages the thread 11 .
  • the complementary thread 14 of the adapter 7 is likewise configured such that a thread root 20 has a larger axial longitudinal extension than a thread head engaging said thread root 20 .
  • the interacting threads 11 and 14 substantially serve to center the adapter 7 in the drill head 1 and, in the event of load exerted on the drill head 1 , particularly during percussion or rotary percussion drilling, will not absorb any axial load so as to be free of any loads acting in the axial direction.
  • the interacting threads 11 and 14 substantially serve to center the adapter 7 in the drill head 1 and, in the event of load exerted on the drill head 1 , particularly during percussion or rotary percussion drilling, will not absorb any axial load so as to be free of any loads acting in the axial direction.
  • the configuration in this case is devised such that, during drilling, a thread head 13 of the thread 14 formed on the adapter 7 will be substantially centrally disposed in a thread root 12 of the complementary thread 11 within the drill head 1 , and that substantially identical free spaces 15 will be provided on the two sides of the thread head 13 , both in the direction towards the work face and the drill pins 2 of the drill head 1 and in the direction facing away from the borehole interior, such that no load whatsoever will act on the thread head(s) 13 during drilling and, in particular, percussion and/or rotary percussion drilling.
  • the interacting threads 11 and 14 in this case, in particular, ensure that the drill head 1 is centrally disposed on the adapter 7 and no bending elements will act on the drill bit during drilling.
  • the safe and reliable transmission of the axial force of the drill string to the drill bit 1 will be safeguarded, and due to the configuration of the end teeth 5 and 8 , respectively, the safe and reliable transmission of the torque to the drill bit 1 will, furthermore, be ensured during rotary percussion drilling.
  • the interacting wedge-shaped surfaces 5 and 6 of the drill head 1 and the adapter 7 are configured such that they can be guided one above the other without impeding each other and also that the end teeth 5 and 8 respectively formed in the two elements 1 and 7 can be freely moved one above the other without colliding or hitting each other, thus ensuring the safe and reliable screwing of the adapter 7 into the drill head 1 .
  • FIG. 5 finally depicts the two-part drilling tool during the retraction of the adapter 7 in the sense of arrow 17 , as is usually performed during rotary percussion drilling.
  • the shoulder 18 of the thread head 13 of the thread 14 formed on the adapter 7 which shoulder faces away from the interior of the borehole, comes into abutment on the side 19 facing away from the interior of the borehole, of the thread 11 formed in the drill head 1 and, to be more precise, on the shoulder 19 facing away from the interior of the borehole, of the thread root 12 of the thread 11 .
  • a configuration according to the present invention thus manages to provide a threaded connection 11 , 14 between a drill head 1 and an adapter 7 , which threaded connection 11 , 14 is completely unloaded during drilling and by which connection the total axial load is applied to the drill head 1 via the wedge-shaped surfaces 4 and 6 , and the torque load during rotary percussion drilling is applied via the end teeth 5 and 8 , such that, overall, a wear of the thread 11 of the drill head 1 as well as the external thread 14 of the adapter 7 will be safely prevented, and the safe and reliable detachment of the drilling tool and the adapter 7 from the drill head 1 will be ensured upon completion of the drilling procedure, and even the adapter 7 will be available for further use.
  • FIG. 7 depicts a section through an adapter 7 , in which the lead angles ⁇ 1 and ⁇ 2 of the wedge-shaped surface 6 and the thread 14 , respectively, are shown.
  • the angles ⁇ 1 and ⁇ 2 which have been determined as lead angles of the respective threads based on a fictitious axis 22 extending normally to a longitudinal axis 21 of the adapter, clearly indicate that the screwing of the adapter 7 into the drill head 1 , which is not illustrated in FIG. 7 , forces the thread 14 to lift off the complementary thread 11 of the drill head 1 , thus keeping the complementary threads 11 , 14 free of forces in the axial direction during the drilling procedure.
  • the special constructive design ensures that the breaking-off of the end teeth 5 and 8 and a wear of the wedge-shaped surfaces 4 and 6 will be prevented, wherein, in particular, the wedge-shaped surfaces 6 and the end teeth 8 are case-hardened so as to achieve a particularly high stability.
  • the threads 11 , 14 By forming the wedge-shaped surfaces 4 and 6 with leads that differ from those of the threads 11 , 14 provided in the interior of the drill head 1 and on the exterior of the adapter 7 , respectively, the threads 11 , 14 , in particular, will be kept free of loads in the axial direction, and hence not unnecessarily worn.

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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)
US13/639,599 2010-04-07 2011-04-06 Two-part drilling tool for the percussive or rotary percussive drilling of holes in soil material or rock material Abandoned US20130098689A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ATA559/2010A AT509643B1 (de) 2010-04-07 2010-04-07 Zweiteiliges bohrwerkzeug zum schlag- oder drehschlagbohren von löchern in boden- oder gesteinsmaterial
ATA559/2010 2010-04-07
PCT/AT2011/000164 WO2011123875A2 (de) 2010-04-07 2011-04-06 Zweiteiliges bohrwerkzeug zum schlag- oder drehschlagbohren von löchern in boden- oder gesteinsmaterial

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US20130098689A1 true US20130098689A1 (en) 2013-04-25

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US13/639,599 Abandoned US20130098689A1 (en) 2010-04-07 2011-04-06 Two-part drilling tool for the percussive or rotary percussive drilling of holes in soil material or rock material

Country Status (7)

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US (1) US20130098689A1 (pl)
EP (1) EP2556205B1 (pl)
AT (1) AT509643B1 (pl)
AU (1) AU2011238405A1 (pl)
CA (1) CA2795560A1 (pl)
PL (1) PL2556205T3 (pl)
WO (1) WO2011123875A2 (pl)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015174920A3 (en) * 2014-05-16 2016-03-10 Atlas Copco Secoroc Ab Joint and joint parts for drill string components
WO2016183645A1 (pt) * 2015-05-15 2016-11-24 Dos Santos Márcio Processo e dispositivo para tratamento de túneis através de enfilagens tubulares auto-revestidas e auto-injetáveis
WO2017004666A1 (en) * 2015-07-09 2017-01-12 Fero Group Pty Ltd Two part drill bit assembly
CN108678678A (zh) * 2018-06-06 2018-10-19 中国矿业大学 一种矿用双层干式吸尘钻头
WO2021069657A1 (en) * 2019-10-11 2021-04-15 Sandvik Mining And Construction Tools Ab Shoulder protected drilling assembly

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US3114566A (en) * 1961-04-21 1963-12-17 Kobe Inc Shrink fit tubing joint
US20050067195A1 (en) * 2002-02-21 2005-03-31 Johan Linden Drill member for rock drilling and a method for manufacturing the drill member
US20070057508A1 (en) * 2005-09-13 2007-03-15 Weatherford/Lamb, Inc. Expansion activated anti-rotation device
US20080099245A1 (en) * 2006-11-01 2008-05-01 Hall David R Cam Assembly in a Downhole Component
AT505072A1 (de) * 2007-04-13 2008-10-15 Alwag Tunnelausbau Gmbh Verfahren und vorrichtung zum sichern eines mit einem aussengewinde versehenen gegenstands
WO2008150207A1 (en) * 2007-06-05 2008-12-11 Sandvik Intellectual Property Ab Rock-drilling equipment as well as female and male parts therefor

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US2052011A (en) 1934-08-06 1936-08-25 Timken Roller Bearing Co Separable drill bit
US2673715A (en) * 1950-06-02 1954-03-30 Timken Roller Bearing Co Rock drill bit
DE2543578C2 (de) 1975-09-30 1986-03-06 Friedrich Duss Maschinenfabrik GmbH & Co, 7265 Neubulach Gesteinsbohrer
AU503750B2 (en) * 1976-07-13 1979-09-20 William Lister Rock drilling bit
DE3330025A1 (de) * 1982-08-30 1984-03-01 Ingersoll-Rand Co., 07675 Woodcliff Lake, N.J. Zweistueckiger bohrer
SE458943B (sv) * 1984-10-10 1989-05-22 Jan Persson Koppling mellan en borrkrona och borraxel
DE19541163A1 (de) 1995-11-04 1997-05-07 Hawera Probst Kg Hartmetall Bohrwerkzeug, insbesondere zur Bearbeitung von Gestein
AT505158B1 (de) * 2007-04-19 2008-11-15 Techmo Entw & Vertriebs Gmbh Vorrichtung zum lösbaren verbinden einer bohrkrone mit einem bohrgestänge

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3114566A (en) * 1961-04-21 1963-12-17 Kobe Inc Shrink fit tubing joint
US20050067195A1 (en) * 2002-02-21 2005-03-31 Johan Linden Drill member for rock drilling and a method for manufacturing the drill member
US20070057508A1 (en) * 2005-09-13 2007-03-15 Weatherford/Lamb, Inc. Expansion activated anti-rotation device
US20080099245A1 (en) * 2006-11-01 2008-05-01 Hall David R Cam Assembly in a Downhole Component
AT505072A1 (de) * 2007-04-13 2008-10-15 Alwag Tunnelausbau Gmbh Verfahren und vorrichtung zum sichern eines mit einem aussengewinde versehenen gegenstands
WO2008150207A1 (en) * 2007-06-05 2008-12-11 Sandvik Intellectual Property Ab Rock-drilling equipment as well as female and male parts therefor

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015174920A3 (en) * 2014-05-16 2016-03-10 Atlas Copco Secoroc Ab Joint and joint parts for drill string components
AU2015259870B2 (en) * 2014-05-16 2019-05-02 Epiroc Drilling Tools Aktiebolag Joint and joint parts for drill string components
RU2687837C2 (ru) * 2014-05-16 2019-05-16 Эпирок Дриллинг Тулз Актиеболаг Замок и части замка для компонентов бурильной колонны и компоненты
WO2016183645A1 (pt) * 2015-05-15 2016-11-24 Dos Santos Márcio Processo e dispositivo para tratamento de túneis através de enfilagens tubulares auto-revestidas e auto-injetáveis
WO2017004666A1 (en) * 2015-07-09 2017-01-12 Fero Group Pty Ltd Two part drill bit assembly
CN108678678A (zh) * 2018-06-06 2018-10-19 中国矿业大学 一种矿用双层干式吸尘钻头
WO2021069657A1 (en) * 2019-10-11 2021-04-15 Sandvik Mining And Construction Tools Ab Shoulder protected drilling assembly

Also Published As

Publication number Publication date
AU2011238405A1 (en) 2012-11-01
WO2011123875A2 (de) 2011-10-13
WO2011123875A3 (de) 2012-03-08
AU2011238405A2 (en) 2012-11-29
PL2556205T3 (pl) 2015-07-31
EP2556205A2 (de) 2013-02-13
EP2556205B1 (de) 2015-01-07
AT509643B1 (de) 2013-08-15
CA2795560A1 (en) 2011-10-13
AT509643A1 (de) 2011-10-15

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AS Assignment

Owner name: DYWIDAG-SYSTEMS INTERNATIONAL GMBH, AUSTRIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KARPELLUS, WALTER;BOHM, KARL;REEL/FRAME:029611/0206

Effective date: 20121210

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION