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EP0043000A1 - Outil de forage à organes coupants expansibles - Google Patents

Outil de forage à organes coupants expansibles Download PDF

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Publication number
EP0043000A1
EP0043000A1 EP81104350A EP81104350A EP0043000A1 EP 0043000 A1 EP0043000 A1 EP 0043000A1 EP 81104350 A EP81104350 A EP 81104350A EP 81104350 A EP81104350 A EP 81104350A EP 0043000 A1 EP0043000 A1 EP 0043000A1
Authority
EP
European Patent Office
Prior art keywords
tool
shaft
shank
bore
feed
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
EP81104350A
Other languages
German (de)
English (en)
Other versions
EP0043000B1 (fr
Inventor
Heinrich Liebig
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT81104350T priority Critical patent/ATE7325T1/de
Publication of EP0043000A1 publication Critical patent/EP0043000A1/fr
Application granted granted Critical
Publication of EP0043000B1 publication Critical patent/EP0043000B1/fr
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
    • E21B10/00—Drill bits
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
    • 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
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/83—Tool-support with means to move Tool relative to tool-support
    • Y10T408/85—Tool-support with means to move Tool relative to tool-support to move radially
    • Y10T408/858—Moving means including wedge, screw or cam
    • Y10T408/8588—Axially slidable moving-means
    • Y10T408/85884—Tool pivotally mounted on support
    • 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
    • Y10T82/00—Turning
    • Y10T82/12—Radially moving rotating tool inside bore
    • Y10T82/125—Tool simultaneously moving axially
    • Y10T82/128—Pivoted to tool-carrier

Definitions

  • the invention relates to a drilling tool for producing undercuts in pilot holes in masonry, concrete, rock and the like. with a rotatably drivable tool shank that can be inserted into the pilot hole i to be provided with the undercut, in the bore-inner end region of which at least one cutting tool is arranged such that its cutting edge can gradually be displaced radially outward into the wall of the pilot hole after the shaft has been inserted into the pilot hole, wherein the cutting tool is arranged on a pivotable in a longitudinal slot-like recess in the bore-inner end portion of the tool shank, designed as a two-armed lever, which is formed by the End of the inside of the bore of a feed shank which is longitudinally displaceable but non-rotatably penetrating through a predetermined amount and which has its outer end brought out of the outer end of the tool shank and can be pivoted from a position pivoted back into the slot-like recess by pushing the shank into the tool shank into a position which protru
  • the machined hole dust from the hole wall is placed in the recess in the cutting tool holder, it can happen in isolated cases that the pivoting of the cutting required after the drilling process tool holder is hindered back into the recess, or the force of the spring is not sufficient to retract the cutting tool completely into the recess, so that additional manipulations are required to remove the undercut tool from the bore.
  • the invention has for its object to increase the drilling performance of the drilling tool compared to the known drilling tool so that the production of undercuts in holes in concrete qualities of high strength with comparatively short drilling times is possible, with an impairment of the function of the drilling tool by the Drilling process resulting drill hole should be avoided.
  • the cutting tool carrier has a lever arm on the inside of its bore on its rear side opposite the cutting tool has a pressure surface which is inclined at an angle to the direction of displacement of the infeed shaft and on which a delivery cam formed on the inside of the bore of the infeed shaft engages and which, when the infeed shaft is displaced relative to the tool shaft into the interior of the bore, pivots the cutting tool carrier out of the recess in the tool shaft with an increasingly larger lever arm .
  • the rear of the lever arm on the bore-mouth side of the cutting tool carrier has a pressure surface which runs obliquely in the opposite direction to the bore-inner lever arm and on which the feed cam engages when the feed shaft is displaced out of the bore relative to the tool shaft.
  • a helical spring which is supported on the tool shaft on the one hand and on the feed shaft on the other hand and is under compressive prestress, is provided in the area of the feed shaft which leads out and extracts the feed shaft automatically from the tool shaft, when the operator no longer applies feed force to him.
  • the helical spring is expediently supported on the bore-mouth end face of the tool shank on the one hand and the end face of a collar component provided on the feed shank on the other hand, whereby it may be expedient to design the collar component in selectable axial positions on the area of the feed shank protruding from the tool shank, since so the The preload of the coil spring can be changed
  • the helical spring is expediently arranged within a sleeve attached to the end of the tool shank, in which the front end of the collar component facing the bore engages in a longitudinally displaceable manner.
  • the coil spring is therefore completely encapsulated within the sleeve.
  • the non-rotatable and longitudinally displaceable coupling of the infeed shank to the tool shank is achieved by a in a transverse bore of the tool shank and an elongated hole in the feed shank.
  • this coupling can also take place in that a section provided with a multi-wedge profile is provided on the feed shaft, which section is arranged in a sleeve section of the production shaft provided with a complementary multi-wedge profile so as to be non-rotatable but longitudinally displaceable
  • the feed shank in its area led out of the tool shank is designed as a multi-spline shank section, which at its front end facing the tool shank is still partly in a sleeve-shaped section of the tool shank with an inner multi-spline profile complementary to the multi-spline profile of the multi-spline shank section engages, the sleeve section provided with the multi-wedge profile being dimensioned such that the multi-wedge shaft section can be displaced into the sleeve section by the tool / required dimension for pivoting the cutting support.
  • a resilient return of the feed shank relative to the tool shank can be provided in order to simplify the handling of the tool, in that one is supported in the sleeve section on the one hand on the front end face of the multi-wedge shank section and on the bottom of the sleeve section on the tool shaft on the other hand Compression spring is arranged.
  • a functional improvement of the tools designed in the manner according to the invention is achieved in that the slot-like recess for receiving the cutting tool carrier lies in the insertion direction in front of the cutting tool carrier. Section of the tool shank is extended and configured to a receiving pocket for the material (drilling dust) worked out by the cutting tool from the wall of the pilot hole. Obstacles to the pivoting-out process of the cutting tool carrier due to drilling dust collecting in the recess are thus avoided.
  • the feed shank can be drilled in the middle over its entire length for this purpose, so that this bore ends on the cutting tool side in the recess in the tool shaft receiving the cutting tool carrier.
  • a device for extracting the drilling dust from the machine-side mouth of the bore must then be provided in the drive machine receiving the drilling tool.
  • the drilling tool according to the invention shown in the drawing designated in its entirety by 10, for drilling an undercut in a cylindrical pilot hole previously produced in a conventional manner in a base of stone, concrete, masonry or the like.
  • a tool shank 12 in the front end region of which is to be inserted into the pilot hole, a longitudinal slot-like recess 14 which is open on one side is provided.
  • a cutting tool carrier 18 is mounted on a bolt l6 in the form of a flat, elongated, double-armed lever fitted into the recess 14 in width, on the inside of the bore in the drawing.
  • the actual cutting tool 20, which is arranged, for example, from an in a suitable receptacle for the cutting tool carrier 18 is formed by hard-soldered hard metal plate, on which the cutting edges which are designed in accordance with the shape of the undercut to be produced are ground.
  • the tool shank 12 has a longitudinal center bore 22 extending from its bore-outer end to the recess 14, in which a feed shank 24 is inserted so as to be longitudinally displaceable but non-rotatable, which still protrudes from the tool shank 12 to a considerable extent.
  • the rotation is secured by a pin 30 penetrating a transverse bore 26 in the tool shank 12 and an elongated hole 28 in the feed shank 24.
  • the longitudinal center bore and the delivery shaft could also - at least in a partial area - be complementarily polygonal in cross section, e.g. can be square or hexagonal, or the rotation of the shafts 12, 24 relative to one another can alternatively be prevented by a tongue and groove connection.
  • the free end of the end of the feed shaft 24 protruding from the tool shaft 12 is designed as a hexagon at 32.
  • the back of the lever arm 18a of the cutting tool carrier 18, which is opposite the cutting tool 20, is designed as a pressure surface 34 which extends obliquely to the direction of displacement of the infeed shaft 24, specifically its inclination is chosen such that it relates to the one in the drawing shown position of the drilling tool with recess 14 opening to the right runs from top right to bottom left.
  • a delivery cam 36 attached to the lower end of the delivery shaft 24 and passed past the rear of the second lever arm 18b on the bore mouth side can be brought into contact with the pressure surface 34 by inserting the delivery shaft into the tool shaft with its somewhat rounded front end.
  • the delivery cam 36 supported with its rear side on the closed side of the recess forces the pressure surface 34, ie the lever arm 18a inside the bore, towards the open side of the recess 14, as a result of which the cutting tool 20 emerges from the recess 14 with increasing insertion of the delivery shaft 24 until it assumes the position indicated in dash-dotted lines and projecting beyond the circumference of the tool shank 12.
  • the lever arm of the feed force exerted by the feed cam 36 on the pressure surface 34 when the feed shaft 24 is pushed in is therefore greater with increasing insertion depth.
  • the rear of the lever arm 18b on the bore mouth side of the cutting tool carrier 18 is also designed as a pressure surface 38, which is inclined in the opposite direction to the pressure surface 34.
  • the drilling tool 10 is already functional to the extent described so far, but its handling is further improved in practice by the fact that a helical spring 42 is arranged in the area of the feed shaft 24 which leads out of the tool shaft 12. is, the lower end is supported on the bore mouth side end face of the tool shank 12, while their abuts the other end thereof under compression at the side facing the bore face of a u set shaft 24 is pushed onto the Z and mounted on ilm collar member 44th
  • a threaded pin 48 screwed into a radial threaded bore 46 in the collar component 44, the collar component can be fastened in selectable axial positions on the feed shaft 24.
  • the bias of the coil spring 24 can therefore be changed to a certain extent.
  • the coil spring 42 is surrounded by a sleeve 50 which is attached to the end of the tool shaft 12 and in the other end of which the collar component 44 fits, i.e. engages longitudinally.
  • An enlarged receiving pocket 52 which continues the recess 40 and extends the recess 40 in the insertion direction in front of the cutting tool carrier 18, serves to receive the drilling dust worked out by the cutting tool 20 from the wall of a pilot hole This avoids drilling dust. Even if drilling dust should have accumulated in this area, it is displaced into the receiving pocket 52 when the delivery shaft is pulled back.
  • the drilling tool 110 shown in FIGS. 2 and 3 differs from the drilling tool 10 described above essentially only in the manner of the rotationally fixed but longitudinally displaceable coupling of the feed and tool shafts, so that it is sufficient to describe only this coupling below, while referring to the general description of the drilling tool 110, the foregoing description.
  • the parts of the drilling tool 110 which correspond to the parts of the drilling tool 10 are identified by the same reference numerals, but with the preceding 1.
  • the feed shank 124 of the drilling tool 110 carries a pressed-on or otherwise rigidly fastened multi-wedge body 160 which is provided with a complementary multi-wedge profile Sleeve section 162 engages at the rear end of the tool shank 112, the length of the sleeve section 162 in relation to the multi-wedge body 160 being dimensioned such that the plurality body 160 counteracts the action of the spring 142 by that required for the pivoting of the cutting tool carrier 118 Delivery path can be inserted into the sleeve section 162.
  • the feed shank 124 is provided with a continuous longitudinal center bore 164, which makes it possible for the drilling dust which collects when working with the tool 110 in the recess 114 receiving the cutting tool carrier 118 to be continuously sucked off if the drive machine for the tool has a corresponding suction device is provided.
  • the rotationally fixed and longitudinally displaceable connection of the feed shank 224 to the tool shank 212 takes place by means of a multi-spline connection.
  • the area of the feed shank 224 which is led out of the tool shank 212 is formed overall as a multi-wedge shank section 260 which, at its front end facing the tool shank 212, engages somewhat in a sleeve-shaped section 262 at the rear end of the tool shank.
  • this sleeve-shaped section 262 is provided with a multi-wedge profile that is complementary to the multi-wedge profile of the shaft section 260, which means in the direction of rotation the tool is given a positive connection between the shaft section 260 and the sleeve section 262.
  • the sleeve section 262 is in turn dimensioned such that the multi-spline shaft section 260 can be pushed into the sleeve section 262 by the required feed path.
  • the compression spring 242 which supports the resetting, is supported between the front end face 261 of the multi-coil shaft section 260 on the one hand and on the bottom 263 of the sleeve section 262 on the tool shaft 212 on the other hand.
  • the feed shaft 224 can be provided with a longitudinal center bore 264 (FIG. 5) for the extraction of the drilling dust during the drilling operations.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Earth Drilling (AREA)
  • Drilling And Boring (AREA)
EP81104350A 1980-06-30 1981-06-05 Outil de forage à organes coupants expansibles Expired EP0043000B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81104350T ATE7325T1 (de) 1980-06-30 1981-06-05 Hinterschnitt-bohrwerkzeug.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3024656 1980-06-30
DE3024656A DE3024656C2 (de) 1980-06-30 1980-06-30 Hinterschnitt-Bohrwerkzeug

Publications (2)

Publication Number Publication Date
EP0043000A1 true EP0043000A1 (fr) 1982-01-06
EP0043000B1 EP0043000B1 (fr) 1984-05-02

Family

ID=6105980

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81104350A Expired EP0043000B1 (fr) 1980-06-30 1981-06-05 Outil de forage à organes coupants expansibles

Country Status (7)

Country Link
US (1) US4411324A (fr)
EP (1) EP0043000B1 (fr)
JP (1) JPS5739915A (fr)
AT (1) ATE7325T1 (fr)
CA (1) CA1157464A (fr)
DE (1) DE3024656C2 (fr)
ES (1) ES8204334A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4502554A (en) * 1982-06-02 1985-03-05 Jones Richard H Expansible tool for reaming frustoconical undercuts in cylindrical holes
GB2223550A (en) * 1988-09-16 1990-04-11 Water Res Centre Pipe tapping
EP0370204A1 (fr) * 1988-11-24 1990-05-30 fischerwerke Artur Fischer GmbH & Co. KG Dispositif de forage pour la préparation de trous de sondage à contre-dépouille
EP0408379A1 (fr) * 1989-07-14 1991-01-16 David Patrick Payne Forets

Families Citing this family (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4586573A (en) * 1982-06-02 1986-05-06 Jones Richard H Rotary expansion tool for reaming frustoconical undercuts in the walls of cylindrical holes
JPS59184608A (ja) * 1983-04-05 1984-10-20 産機興業株式会社 穿孔拡開ドリル
DE3327409A1 (de) * 1983-07-29 1985-02-07 Hawera Probst Gmbh + Co, 7980 Ravensburg Bohrwerkzeug zur herstellung von hinterschneidungen in vorgefertigten bohrungen
JPS60145005U (ja) * 1984-03-08 1985-09-26 株式会社ミヤナガ 拡径孔部削成装置
US4635737A (en) * 1984-03-08 1987-01-13 Kabushiki Kaishi Miyanaga Undercutting drill
US4630978A (en) * 1985-10-03 1986-12-23 Terry L. Keiser Thread chasing tool
IT1204117B (it) * 1986-01-28 1989-03-01 Luciano Frazzoli Attrezzo per eseguire lamature su macchine utensili in particolare all'estremita' non accessibile di fori passanti
JPH0829445B2 (ja) * 1986-12-16 1996-03-27 株式会社ミヤナガ 上向き拡径孔部削成装置
JPH01148214U (fr) * 1988-03-30 1989-10-13
DE8806973U1 (de) * 1988-05-27 1989-10-12 Plica Werkzeugfabrik Ag, Mollis Fräswerkzeug
DE3819833C2 (de) * 1988-06-10 1998-05-07 Drebo Werkzeugfab Gmbh Dübelbohrer
DE3909481A1 (de) * 1989-03-22 1990-09-27 Adolf Wuerth Gmbh & Co Kg Bohrwerkzeug
US5086852A (en) * 1990-08-27 1992-02-11 Wada Ventures Fluid flow control system for operating a down-hole tool
GB2297052B (en) * 1995-01-23 1998-02-18 David Patrick Payne Improvements in drills
JP2862830B2 (ja) * 1996-03-13 1999-03-03 株式会社ミヤナガ アンダーカット部付き孔の穿孔装置
US5800148A (en) * 1997-12-03 1998-09-01 Wise; Michael A. Blind-taper hole saw
US5927911A (en) * 1998-10-19 1999-07-27 R. Steiner Technologies, Inc. Automatic fluid actuated spotfacing and counterboring tool
JP2006523542A (ja) * 2003-04-17 2006-10-19 セカント メディカル エルエルシー 展開可能な切削刃を備えた工具
CN1315627C (zh) * 2004-09-24 2007-05-16 徐洁媛 一种深孔绞刀具
JP2006095658A (ja) * 2004-09-30 2006-04-13 Asahi Maintenance Kogyo:Kk 管体の切削及び／又は切断装置
US7357613B2 (en) * 2006-01-26 2008-04-15 Simpson Strong -Tie Company, Inc. Expansion anchor with crack-arresting groove
WO2010009226A1 (fr) * 2008-07-18 2010-01-21 Valenite Llc Outil d'alésage inverse avec actionnement par agent de refroidissement
DE102008044802B4 (de) * 2008-08-28 2014-10-23 Edith & Gerhard Esberger GbR Werkzeug zur spanabhebenden Bearbeitung von in einem Gestell fest eingespannten Werkstücken
US8122978B1 (en) 2009-05-05 2012-02-28 John Clifford Drilling device with undercutting
DE102012005246A1 (de) * 2012-03-14 2013-09-19 Ulf Heule Entgratwerkzeug zur Entgratung von insbesondere unrunden Ausnehmungen in Werkstücken
US9089905B1 (en) * 2012-05-30 2015-07-28 The Boeing Company Omni-directional deburring blade
AU2014310197B2 (en) * 2013-08-23 2016-12-22 Kabushiki Kaisha Miyanaga Hole-drilling device for drilling hole with expanded diameter hole portion
CN103603602B (zh) * 2013-10-29 2016-08-17 河南理工大学 变推力变径钻
US20150313611A1 (en) * 2014-05-02 2015-11-05 Howmedica Osteonics Corp. Undercutting bone drills and methods of use
WO2016063279A2 (fr) 2014-10-19 2016-04-28 T.A.G. Medical Devices - Agriculture Cooperative Ltd. Kit comprenant un système de guidage et un dispositif d'enlèvement de matériel osseux et procédé d'utilisation associé
JP7007190B2 (ja) * 2015-04-09 2022-01-24 ティー．エー．ジー． メディカル デヴァイシス－アグリカルチャー コーポラティヴ リミテッド 骨材料除去装置およびその使用方法
EP3799806A1 (fr) 2016-02-11 2021-04-07 T.A.G. Medical Devices - Agriculture Cooperative Ltd. Dispositif de retrait de matériau osseux
EP3448274B1 (fr) 2016-04-24 2024-05-15 T.A.G. Medical Products Corporation Ltd. Dispositif de guidage
US10808481B2 (en) 2017-11-16 2020-10-20 Weatherford Technology Holdings, Llc Apparatus and method for cutting casings
JP7189317B2 (ja) 2018-08-01 2022-12-13 ティー．エー．ジー． メディカル デヴァイシス－アグリカルチャー コーポラティヴ リミテッド 調整可能な穿孔装置およびその使用方法
US11780015B2 (en) * 2021-06-08 2023-10-10 Noga Engineering & Technology (2008) Ltd. Machining tool with deployable blade
EP4122629A1 (fr) 2021-07-19 2023-01-25 Fundación Tekniker Mécanisme d'actionnement pour le mouvement radial d'un outil de coupe d'une barre de forage

Citations (9)

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US1450053A (en) * 1921-07-11 1923-03-27 Expansion Drill Company Expansion drill
US1955631A (en) * 1933-06-22 1934-04-17 Laurence V D Harris Counter boring tool
US2599060A (en) * 1951-02-09 1952-06-03 Archer W Kammerer Expansible rotary drill bit
DE1191769B (de) * 1960-03-11 1965-04-29 Archer William Kammerer Erweiterungsrollenmeissel
DE1207907B (de) * 1962-09-07 1965-12-30 Servco Co Bohrlochwerkzeug
FR1564173A (fr) * 1967-04-18 1969-04-18
CH495492A (de) * 1968-12-31 1970-08-31 Navenby Ltd Bohrwerkzeug zum Herstellen von Ankerbohrungen im Erdreich
US3684041A (en) * 1970-11-16 1972-08-15 Baker Oil Tools Inc Expansible rotary drill bit
DE2731901A1 (de) * 1977-07-14 1979-02-01 Heinrich Liebig Hinterschnitt-bohrwerkzeug

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US165787A (en) * 1875-07-20 Improvement in expansion-drills
US473909A (en) * 1892-05-03 Rock-drilling apparatus
US226067A (en) * 1880-03-30 Peters
US1045670A (en) * 1912-01-04 1912-11-26 Arthur P Buck Well-reaming implement.
US2203011A (en) * 1937-04-08 1940-06-04 Guy P Ellis Pipe cutter
US2202986A (en) * 1939-07-24 1940-06-04 James T Ellis Pipe cutter

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1450053A (en) * 1921-07-11 1923-03-27 Expansion Drill Company Expansion drill
US1955631A (en) * 1933-06-22 1934-04-17 Laurence V D Harris Counter boring tool
US2599060A (en) * 1951-02-09 1952-06-03 Archer W Kammerer Expansible rotary drill bit
DE1191769B (de) * 1960-03-11 1965-04-29 Archer William Kammerer Erweiterungsrollenmeissel
DE1207907B (de) * 1962-09-07 1965-12-30 Servco Co Bohrlochwerkzeug
FR1564173A (fr) * 1967-04-18 1969-04-18
DE1752177B1 (de) * 1967-04-18 1971-12-30 John Darbyshire & Co Ltd Bohrwerkzeug zum Erweitern von Blindbohrungen
CH495492A (de) * 1968-12-31 1970-08-31 Navenby Ltd Bohrwerkzeug zum Herstellen von Ankerbohrungen im Erdreich
US3684041A (en) * 1970-11-16 1972-08-15 Baker Oil Tools Inc Expansible rotary drill bit
DE2731901A1 (de) * 1977-07-14 1979-02-01 Heinrich Liebig Hinterschnitt-bohrwerkzeug

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4502554A (en) * 1982-06-02 1985-03-05 Jones Richard H Expansible tool for reaming frustoconical undercuts in cylindrical holes
GB2223550A (en) * 1988-09-16 1990-04-11 Water Res Centre Pipe tapping
EP0370204A1 (fr) * 1988-11-24 1990-05-30 fischerwerke Artur Fischer GmbH & Co. KG Dispositif de forage pour la préparation de trous de sondage à contre-dépouille
EP0408379A1 (fr) * 1989-07-14 1991-01-16 David Patrick Payne Forets

Also Published As

Publication number Publication date
ES503444A0 (es) 1982-05-16
EP0043000B1 (fr) 1984-05-02
ES8204334A1 (es) 1982-05-16
CA1157464A (fr) 1983-11-22
JPS5739915A (en) 1982-03-05
US4411324A (en) 1983-10-25
DE3024656C2 (de) 1982-08-12
ATE7325T1 (de) 1984-05-15
DE3024656A1 (de) 1982-01-21

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