EP0065284A1 - Alésoir - Google Patents

Alésoir Download PDF

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Publication number
EP0065284A1
EP0065284A1 EP82104184A EP82104184A EP0065284A1 EP 0065284 A1 EP0065284 A1 EP 0065284A1 EP 82104184 A EP82104184 A EP 82104184A EP 82104184 A EP82104184 A EP 82104184A EP 0065284 A1 EP0065284 A1 EP 0065284A1
Authority
EP
European Patent Office
Prior art keywords
carrier housing
cutting
housing
carrier
pivot
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
EP82104184A
Other languages
German (de)
English (en)
Other versions
EP0065284B1 (fr
Inventor
Alfred Ostertag
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.)
Saint Gobain Abrasives Inc
Original Assignee
Norton Co
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 Norton Co filed Critical Norton Co
Priority to AT82104184T priority Critical patent/ATE14775T1/de
Publication of EP0065284A1 publication Critical patent/EP0065284A1/fr
Application granted granted Critical
Publication of EP0065284B1 publication Critical patent/EP0065284B1/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
    • E21B10/327—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 the cutter being pivoted about a longitudinal axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/18—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling 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 device for undercutting spaces in cylindrical boreholes, in particular those in artificial and natural rock, according to the preamble of claim 1.
  • Boreholes drilled in more or less homogeneous materials provide a borehole wall parallel to the borehole axis, which is undesirable in numerous applications. This applies e.g. especially for anchor holes in artificial stone, e.g. Concrete in which any anchoring means have to be fixed. It is therefore often desirable for all types of bores to provide undercuts in the borehole wall, in order to improve the fixing of anchoring means in the borehole, as in the case of anchor holes, or to create extensions for other purposes.
  • the carrier housing forms a cutting head which can be inserted into the borehole in a predetermined position and rotated by means of a pressure medium drive.
  • the cutting head comprises broaching tools which can be extended radially by means of pressure medium drives and which intermittently come from a rest position within the cross-sectional contour of the cutting tool. Head can be moved radially outward into a working position in which the cutting member designed as a butt cutting body protrudes beyond the cross-sectional contour of the cutting head and can intervene in the borehole wall.
  • a pressure-medium-actuated actuating device is used, which can be actuated from an area outside the borehole and which conveys radially oscillating impact movements to the broaching tools.
  • Devices of this type with radial linear movement of the broaching tools require a relatively large diameter for the cutting head to accommodate the radially directed pressure medium pistons, proving to be susceptible to wear under the often rough operating conditions, since the radial guide surfaces that absorb the tilting moments on the broaching tools are subjected to high loads Difficulties with permanent sealing of the pressure medium rooms and require considerable maintenance and repair work, especially when it becomes necessary to replace used cutting elements.
  • the invention has for its object to design a device of the type specified in the preamble of claim 1 in such a way that it can be implemented with small structural measurements, is robust at low production costs and can be used with easy tool change and high clearing performance.
  • the design of the device according to the invention provides a support of the broaching tools free of tilting moments during operation, which considerably simplifies and reduces the construction effort, considerably reduces the wear and the sensitivity of the device and can also be carried out in devices which are used to clear boreholes only relatively small diameters or cross-sectional dimensions are to be used.
  • the device according to the invention enables a progressive infeed of the cutting element into the borehole wall, which is free of impact loads from the Cutting member and it allows to use multiple cutting bodies for the cutting member, which are usually not able to cope with shock loads, but on the other hand provide significantly higher clearing performance.
  • the device enables the formation of very exact contours for the areas of the borehole to be cleared, while furthermore the actuation of the broaching tools is considerably simplified, since they only experience their infeed movement through the actuating device, and no own reset drive for their return movement back into the contour of the carrier housing need. Rather, the broaching tools perform an automatic restoring movement in cooperation with the borehole wall as soon as the actuating device's delivery effect is canceled.
  • the device consists of a tubular support housing 1, the outer diameter of which is slightly less than that of a borehole in which clearing work is to be carried out.
  • the carrier housing 1 is provided with a connecting shaft 2 which is connected to a drive, e.g. the drive for a drill as used to create the drill hole can be used.
  • This drive is indicated schematically at 3.
  • Broaching tools 4 are accommodated in the carrier housing 1 and, for reasons of balancing forces, are arranged in a uniform central angle distribution over the circumference of the carrier housing 1 and at the same time are axially offset.
  • only one broaching tool 4 is provided within the same circumferential plane of the carrier housing 1, but it is understood that also within the same circumferential plane, i.e. Located at the same axial height, several broaching tools can also be assigned to the carrier housing 1 if the dimensional relationships allow this.
  • the broaching tools 4 can be moved outwards from a rest position within the cross-sectional contour of the carrier housing into a working position during a work rotation in the direction of arrow 5 of the carrier housing 1, and an adjusting device 6 arranged in the carrier housing 1 is movable for the outward-facing delivery of the broaching tools 4. provided that by means of an actuator 7 from a Area outside the borehole 8 can be actuated.
  • each broaching tool comprises a carrier 9 and a cutting member 10 supported by the carrier is supported in the carrier housing 1.
  • the plane of movement for the towing element 9 intersects the longitudinal central axis 11 of the carrier housing 1 at a right angle, but the plane of movement for the towing element 9 can also intersect the longitudinal central axis 11 of the carrier housing 1 at an angle slightly different from 90 °.
  • the towing element is formed in the preferred exemplary embodiments shown by a rigid pivoted in the carrier housing 1, in its plane of movement extending over part of the circumference of the carrier housing 1 pivot lever 9, however, a spiral spring can also be provided as a towing element, the leading in the direction of rotation 5 End can be firmly connected to the carrier housing 1 in the sense of a clamping.
  • the towing member carries out a displacement movement similar to a pivot relative to the carrier housing 1 with elastic material deformation at least in a partial area of its length.
  • a pivot axis or a pivot axis region defining a pivot axis or a pivot axis region can be provided between the latter and the carrier housing 1, on the one hand firmly with the carrier housing 1 and on the other hand with the end of the pivot lever 1 leading in the direction of rotation 5 of the carrier housing 1 9 can be connected.
  • Versions with a spiral spring as a drag element or with a bend The spring piece as part of a towing element comprising a rigid swivel lever requires a fixed connection to the carrier housing 1.
  • Pivot bearing of the carrier housing 1 defined pivot axis is pivotable.
  • a pivot bearing can be of a more or less, for example.
  • axially directed bore may be formed in the carrier housing 1, in which a cylindrical pivot pin on the pivot lever 9 engages.
  • the pivot lever of the support casing provided 9 each broach 4 at its in A r-beitscardrichturig 5 1 leading end with both sides protruding in the axial direction of the pivot pin 12 and with this in the outer periphery of the carrier housing 1 open, stored in this recessed bearing pocket 13 which is adjacent to an open circumferential slot 14 leading axially on both sides of the pivoting lever 9.
  • the pivot pin 12 has a substantially angular cross-sectional shape
  • the bearing pocket 1.3 also has a substantially angular cross-sectional contour with dimensions which exceed those of the pivot pin 12, so that the pivot pin 12 can easily be inserted into its bearing pocket 13 from the outside is and in the storage pocket 13 has a movement that leaves him pivoting movements in his plane of movement.
  • the bearing pocket 13 On its side looking in the working direction of rotation 5, the bearing pocket 13 has a bearing and driving surface 15 which, when the device is operating, exerts a reaction force on the pivot pin 12 of the pivoting lever 9 with a vector pointing inwards with respect to the carrier housing 1 and indicated at 16 . This can be brought about in a flat bearing and driving surface 15 in that it is inclined towards the imaginary radial plane by its inner edge by a small acute angle in the direction of rotation 5.
  • the pivot pin 12 can deviate from its cross-sectional shape shown also comprise a cylindrical bearing area, in which case the bearing and driving surface of the bearing pocket 13 in turn comprises a partially cylindrical bearing shell.
  • the pivot pin 12 has on its outside a restoring surface area 17 which changes its radial distance from the longitudinal central axis 11 of the carrier housing 1 when the pivoting lever 9 is pivoted.
  • a holding spring 18 is provided in the exemplary embodiment shown, which is designed as a ring-shaped or ring-segment-shaped spring body and here as e.g. Rubber ring spring is formed.
  • the retaining spring 18 is arranged and fixed in a circumferential groove 19 of the carrier housing 1 which intersects with the bearing pocket 13.
  • the cutting member 10 is advantageously designed as a multiple or multiple cutting body, which extends over the circumferential outer surface of the working direction 5 of the carrier housing 1 trailing end of the pivot lever 9 protruding, the borehole wall 8, approximately in the working direction 5 running arcuate outer cutting surface 20 with transversely aligned to the working direction 5 cutting or cutting edges.
  • a multiple-edge body can be formed from a part with diamonds on the surface or from a molded body from a diamond or the like. Matrix penetrated by hard material particles.
  • the curvature of the arc-shaped outer cutting surface 20 is advantageously equal to or smaller than the curvature of the wall of the uncleaned borehole 8, so that in the course of the broaching work, the outer cutting surface 20 is as uniform as possible over the entire length of the work the material to be cleared.
  • the area of the outer cutting surface 20 that is effectively engaged with the material to be cleared is shifted, for example, as shown in FIG. 6 illustrates, from the front to the rear part of the cutting member 10 in the working direction of rotation 5.
  • the arc shape of the outer cutting surface 20 is a segment of an arc of a circle with the radius r, then this radius r is smaller than the radius r 1 of the uncleaned borehole wall 8 and accordingly also smaller than the radius r 2 of the borehole wall 8 'in the clearing area.
  • the cutting member 10 advantageously comprises at least one side cutting surface which can also be used in the axial direction of the borehole 8, in particular if the device is to be used by means of an axial movement of the rotating carrier housing 1 to create clearing areas which are larger in their axial width than the axial width of the cutting members 10.
  • both side surfaces of the cutting member 10, which face in the axial direction advantageously form side cutting surfaces, which is the case with cutting members 10 made of a shaped body made of a diamond or the like.
  • the matrix penetrated by hard material particles is given by itself.
  • the cutting member 10 firmly connected to the pivot lever 9 this can also be designed as a single-cutting body, in which the end face looking into the working direction 5 of the carrier housing 1 forms the cutting edge with its contour line projecting beyond the outer circumferential surface of the pivot lever 9.
  • the single-edge body has on the front side opposite to the working direction of rotation 5.
  • the cutting member 10 When the cutting member 10 is designed as a multiple or multiple-cutting body, the cutting member can also be supported on the pivoting lever by means of a supporting body 21 such that it can be pivoted to a limited extent about a tilt axis 22 oriented perpendicular to the plane of movement of the pivoting lever 9, as is schematically indicated in FIG. 7.
  • the curvature of the outer cutting surface 20 of the cutting member 10 is advantageously greater than the curvature of the wall of the uncleaned borehole 8 and smaller than the curvature of the borehole wall 8 'in a finished clearing area, and in the case of a circular shape of the outer cutting surface 20 with the Radius r is accordingly this radius larger than the radius r 1 of the wall of the borehole 8 and smaller than the radius r 2 of the borehole wall 8 '.
  • the tilt axis 22 in the working direction 5 of the carrier housing 1 is expediently arranged in the rear region and near the cutting member 10 in the support body 21.
  • the actuating device 6 consists of an actuating rod arranged axially displaceable and lockable in the carrier housing 1, which is provided for each broaching tool 4 with a wedge-shaped or conical cam surface 23 for the advancing movement of the pivot lever 9.
  • the actuator 7 is a screw drive provided, which has a first, by means of a bearing 24 on the carrier housing 1 coaxially rotatably mounted bushing 25 with an external thread 26 and a second bushing 27, which in turn is rotatably supported coaxially on the carrier housing 1 via a bearing 28 and with an internal thread 29 on the first bushing 25 can be screwed on.
  • the bearing 28 is axially displaceable along the carrier housing 1 and at the same time forms a lower support for a spacer ring 30, on the top of which two radial, diametrically arranged driving pins 31 are supported. These pass through axial slots 32 in the carrier housing 1 and engage in blind holes 33 in the actuating rod 6. Between the carrier housing 1 and the actuating rod 6, a compression spring 34 is arranged, which is supported on the one hand on an inner shoulder 35 of the carrier housing 1 and on the other hand on an outer collar 36 on the actuating rod 6, the actuating rod 6 in FIG. 2 in the downward direction to move relative to the carrier housing 1.
  • Radial bolts 38 can be inserted into radial bores 37 of the lower bush 25, by means of which the lower bush 25 and with this the upper bush 27 can be prevented from performing a circumferential movement when the carrier housing 1 rotates.
  • the upper bushing 27 also has radial bores 39, into which radial bolts 40 can also be inserted. With the help of these radial bolts 40, the upper bushing 27 can be rotated relative to the lower bushing 25 and thereby screw-adjusted in the axial direction, independently of a rotation of the carrier housing 1. With the aid of this screwing, the adjusting rod 6 in FIG. 2 is either relative to the carrier housing 1 axially displaceable in order to impart the feed movement to the broaching tools 4, or displaceable downwards to release the broaching tools 4 for a return movement back into the contour of the carrier housing after clearing.
  • the carrier housing 1 does not experience any axial movement when the broaching tools are fed in, depending on the cross-sectional shape of the cutting members 10 radial grooves 41, 42, 43, 44 in the wall of the borehole 8, provided the plane of movement for the broaching tools 4 is less than 90 ° to the longitudinal central axis 11 of the carrier housing 1 runs.
  • an undercut area formed by broaching is symbolized, as can be generated by an axial advance of the carrier housing 1 in connection with a return movement of the broaching tools 4.
  • the actuating rod 6 in FIG. 2 is moved downwards relative to the carrier housing 1, whereby the pivot levers 9 are progressively released via the cam surfaces 23 for an inward return movement which they cause due to the reaction of the wall of the borehole 8 on the cutting members 10 perform automatically, unless they are prevented by the cam surfaces 23. of the actuating rod 6.
  • broaching tools 4 As soon as the device is then removed from the borehole 8, the cutting members 6 can be inspected and, in the event of wear or damage that has occurred, the broaching tools 4 as a whole can be removed from their storage pocket 13 in one movement and replaced with new or different broaching tools 4.
  • the simple interchangeability of broaching tools 4 is an extremely important advantage in practice, since not only used broaching tools 4 can be replaced quickly and easily, but there is also the possibility of replacing broaching tools of one type with those of another type, provided that other shapes need to be broached Areas should be created.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Milling Processes (AREA)
EP82104184A 1981-05-16 1982-05-13 Alésoir Expired EP0065284B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82104184T ATE14775T1 (de) 1981-05-16 1982-05-13 Raeumvorrichtung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3119605 1981-05-15
DE3119605A DE3119605C2 (de) 1981-05-16 1981-05-16 Vorrichtung zum unterschneidenden Räumen von zylindrischen Bohrlöchern

Publications (2)

Publication Number Publication Date
EP0065284A1 true EP0065284A1 (fr) 1982-11-24
EP0065284B1 EP0065284B1 (fr) 1985-08-07

Family

ID=6132534

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82104184A Expired EP0065284B1 (fr) 1981-05-16 1982-05-13 Alésoir

Country Status (5)

Country Link
US (1) US4497383A (fr)
EP (1) EP0065284B1 (fr)
AT (1) ATE14775T1 (fr)
CA (1) CA1182311A (fr)
DE (1) DE3119605C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2526851A1 (fr) * 1982-05-11 1983-11-18 Turkmensk Ni Geologorasvedoc Appareil de forage rotatif notamment de puits producteurs d'eau et de puits de drainage
EP0159573A1 (fr) * 1984-04-02 1985-10-30 Witte Bohrtechnik GmbH Procédé et dispositif pour la pose des conduites souterraines d'intérieur inaccessible par poussage contrôlé

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3714837A1 (de) * 1987-05-05 1988-11-24 Duss Maschf Rotierbares werkzeug zur herstellung einer hinterschneidung in einem bohrloch
US4874046A (en) * 1988-04-01 1989-10-17 Hurd Marvin G Groove cutter for concrete bores
JP2598515B2 (ja) * 1989-04-24 1997-04-09 株式会社ミヤナガ 拡径部付孔穿孔装置
JPH11129104A (ja) * 1997-10-28 1999-05-18 Honda Motor Co Ltd リーマーおよびその使用方法
US7350596B1 (en) 2006-08-10 2008-04-01 Attaya James S Methods and apparatus for expanding the diameter of a borehole
US8122978B1 (en) 2009-05-05 2012-02-28 John Clifford Drilling device with undercutting
US20110110736A1 (en) * 2009-08-11 2011-05-12 Robert Cousineau Seismic tool assembly for use in anchor insertion
US20120051859A1 (en) * 2010-08-27 2012-03-01 Robert Cousineau Seismic tool assembly for use in anchor insertion
US9388638B2 (en) * 2012-03-30 2016-07-12 Baker Hughes Incorporated Expandable reamers having sliding and rotating expandable blades, and related methods
DE102013208027A1 (de) * 2013-05-02 2014-11-06 Artis Gmbh Verfahren und vorrichtung zum einstellen auf eine motorspindel einer werkzeugmaschine aufgespannter einstellbarer werkzeuge
CN113863318B (zh) * 2021-10-13 2022-11-22 福建金鼎建筑发展有限公司 一种钻孔灌注桩基坑支护结构

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1427609A (en) * 1920-11-11 1922-08-29 Albert L Mcdonald Mining tool
FR707725A (fr) * 1930-03-18 1931-07-11 Perfectionnements aux moyens pour l'exécution de forages pour scellements à base élargie
GB550100A (en) * 1941-05-16 1942-12-23 Alexander Zussman Orkin Improvements in or relating to drills for mixed excavation
US2621898A (en) * 1948-11-16 1952-12-16 Janes G Brodhead Underreamer
US3180439A (en) * 1962-01-08 1965-04-27 Carroll L Deely Rotary, expansible bore hole reamers with improved safety features
AT297609B (de) * 1968-11-25 1972-04-10 Navenby Ltd Bohrgerät
DE2730026A1 (de) * 1976-07-06 1978-01-12 Macdonald Pneumatics Unterschneider

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US566668A (en) * 1896-08-25 Boiler-tube cutter
US165787A (en) * 1875-07-20 Improvement in expansion-drills
US1007330A (en) * 1910-08-15 1911-10-31 Jack L Browder Boiler-tube cutter.
US1485642A (en) * 1922-04-11 1924-03-04 Diamond Drill Contracting Comp Expanding rotary reamer
US1720942A (en) * 1928-01-19 1929-07-16 Grant John Rotary expansive tool
US1880216A (en) * 1928-06-08 1932-10-04 Richard P Simmons Underreamer for well drilling apparatus
US2152008A (en) * 1933-11-24 1939-03-28 Baash Ross Tool Co Casing perforator
US2243131A (en) * 1940-01-10 1941-05-27 Emsco Derrick & Equip Co Hold-down bearing for rotary
US2280769A (en) * 1940-02-12 1942-04-21 John S Page Casing cutter
US3283405A (en) * 1964-02-05 1966-11-08 Samuel P Braswell Inside pipe cutting tool
GB1554730A (en) * 1975-12-29 1979-10-31 Macdonald Pneumatic Tools Apparatus for undercutting a drill hole
DE2928555A1 (de) * 1979-07-14 1981-01-29 Stumpp & Kurz Bohrwerkzeug
DE3020143A1 (de) * 1980-05-27 1981-12-03 Stumpp + Kurz Gmbh + Co, 7000 Stuttgart Bohrwerkzeug zum herstellen einer konischen erweiterung in einer grundbohrung

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1427609A (en) * 1920-11-11 1922-08-29 Albert L Mcdonald Mining tool
FR707725A (fr) * 1930-03-18 1931-07-11 Perfectionnements aux moyens pour l'exécution de forages pour scellements à base élargie
GB550100A (en) * 1941-05-16 1942-12-23 Alexander Zussman Orkin Improvements in or relating to drills for mixed excavation
US2621898A (en) * 1948-11-16 1952-12-16 Janes G Brodhead Underreamer
US3180439A (en) * 1962-01-08 1965-04-27 Carroll L Deely Rotary, expansible bore hole reamers with improved safety features
AT297609B (de) * 1968-11-25 1972-04-10 Navenby Ltd Bohrgerät
DE2730026A1 (de) * 1976-07-06 1978-01-12 Macdonald Pneumatics Unterschneider

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2526851A1 (fr) * 1982-05-11 1983-11-18 Turkmensk Ni Geologorasvedoc Appareil de forage rotatif notamment de puits producteurs d'eau et de puits de drainage
EP0159573A1 (fr) * 1984-04-02 1985-10-30 Witte Bohrtechnik GmbH Procédé et dispositif pour la pose des conduites souterraines d'intérieur inaccessible par poussage contrôlé

Also Published As

Publication number Publication date
EP0065284B1 (fr) 1985-08-07
DE3119605A1 (de) 1982-12-09
DE3119605C2 (de) 1986-07-10
CA1182311A (fr) 1985-02-12
ATE14775T1 (de) 1985-08-15
US4497383A (en) 1985-02-05

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