EP0886034B1 - Dispositif de forage - Google Patents

Dispositif de forage Download PDF

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Publication number
EP0886034B1
EP0886034B1 EP98110952A EP98110952A EP0886034B1 EP 0886034 B1 EP0886034 B1 EP 0886034B1 EP 98110952 A EP98110952 A EP 98110952A EP 98110952 A EP98110952 A EP 98110952A EP 0886034 B1 EP0886034 B1 EP 0886034B1
Authority
EP
European Patent Office
Prior art keywords
rod
chuck
locking member
length
rotation drive
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.)
Expired - Lifetime
Application number
EP98110952A
Other languages
German (de)
English (en)
Other versions
EP0886034A2 (fr
EP0886034A3 (fr
Inventor
Franz-Josef Püttmann
Gerhard Balve
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 Paul Schmidt Spezialmaschinen 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 Paul Schmidt Spezialmaschinen KG filed Critical Tracto Technik Paul Schmidt Spezialmaschinen KG
Publication of EP0886034A2 publication Critical patent/EP0886034A2/fr
Publication of EP0886034A3 publication Critical patent/EP0886034A3/fr
Application granted granted Critical
Publication of EP0886034B1 publication Critical patent/EP0886034B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/28—Enlarging drilled holes, e.g. by counterboring
    • E21B7/30—Enlarging drilled holes, e.g. by counterboring without earth removal
    • 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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
    • E21B19/086—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods with a fluid-actuated cylinder

Definitions

  • the invention relates to a device for manufacturing and expanding boreholes and destroying them and replacing underground pipelines or for driving pipes.
  • a drilling device for the destructive replacement of a For example, underground pipeline is out U.S. Patent 4,507,019.
  • This device consists of a frame with an adjustable Bearing piece for two feed cylinders connected by a slide.
  • a rotary drive is arranged on the slide, its horizontal shaft with an external thread is provided and with the internal thread on rear end of a multi-shot Screw drill pipe screwed.
  • the frame requires the known device a large construction or launch pit.
  • German laid-open publication 41 13 422 suggests Mount head with a clamping device and one Clamping and turning device in front.
  • the clamping device has two clamping jaws that grip the pipe and that of hydraulic cylinders be driven to the pipe between clamp and secure against twisting.
  • the clamping and rotating device has one around the tube axis rotatable support on which two of opposite Side jaws acting on the tube arranged are driven by one cylinder at a time.
  • Another Cylinder drives a holder in such a way that it rotates around the axis of the Tube is turned around.
  • German patent specifications also has the aforementioned disadvantages 41 22 350 well-known drill, which in terms of its space requirements is arranged above ground and initially an inclined downward Auxiliary drilling creates to reach the laying depth and then in a horizontal To continue drilling.
  • Such devices are not suitable because they are large because of their size Do not allow outside dimensions to be accommodated in the sidewalk area. Of further it is not possible, already in the sidewalk area to the laying depth to come to the house outlet on one laid along the street Main line to connect.
  • DE-AS 1 025 807 describes a rock drilling machine for screwing and boring of boring bars. It exhibits a specially designed Clamping device on, the clamping sleeve surfaces the specially designed Clamp the active surfaces of the boring bars using a frictional connection.
  • the chuck has several parts designed and has a union nut to produce an axial Resilience. When inserting the locking piece of the boom section the union nut must be loosened manually each time to remove the Push the clamping elements radially apart. This is time consuming because separate handles are required for this. In addition, in the starting pit Space for performing the manual work is provided become.
  • the problem lies with the invention based on creating a device, the space requirement is small and a quick connection of a boom section to the rotary drive on the one hand and the rear end of one already in the ground Linkage allowed on the other hand.
  • the invention proposes a device of the beginning mentioned type, the rotary drive according to the invention with a Plug coupling consisting of a chuck on the one hand and a locking piece is provided at the end of a boom or boom section, that is on without the need for screwing can be easily introduced into the feed. This can for example through a radial opening of the feed happen.
  • the chuck avoids screwing on the drive side and can point in the direction of the axis of rotation, in the direction of advance have an open bowl in which the Insert the rear end of the new boom section axially leaves. This bowl then prevents the boom shot while rotating through the insertion opening falls out of the feed. Is the boom shot or seal the bowl, then it is possible, the linkage via a feed line ending in the bowl bottom to provide with a liquid.
  • the plug coupling can be made like a bayonet lock be formed and for example a forehead collar own, behind which there is at least one radial Stop is located when turning the drive shaft of the rotary drive connected chuck in both Directions for screwing the front end of the new one Device shot with the back end of one already Linkage located in the ground as a driver acts.
  • This driver preferably acts with one Stopping area of the boom section together.
  • the feed and the rotary drive with the plug-in coupling are preferably in a frame with a rod guide arranged in the at least one jacking cylinder can be arranged to the rotary drive with the plug-in coupling to move about the length of a boom shot. This can also be done preferably with the help of a arranged in the middle between the two jacking cylinders third propulsion cylinder happen Piston rod is then connected to the rotary drive. On this results in a short overall length with a long one Driving force and relatively large length of the boom section. Telescopic cylinders are also suitable for propulsion.
  • a disadvantage of such cylinders is that Forces are different at each level and therefore not continuous pushing and pulling forces and also not deliver continuous feed speed.
  • the Power transmission from cylinder to rotary actuator too over a chain deflected like a pulley take place, whereby the feed path, for example can double.
  • a cylinder block can also be used are used, the one with three piston rods is provided, one in one and the two extend others in the opposite direction.
  • the holding claw is preferably articulated with one End of a two-armed lever with a frame-fixed Pivot point, which enables a linear claw movement, if the pivot is an elongated hole, for example of the claw carrier reaches through.
  • the frame can be extended with horizontally extendable supports be provided, via which the recoil forces be introduced into the ground.
  • the boom consists of several shots with each an internal thread at one end and a locking piece with an external thread at the other end; it is not only suitable for devices of the aforementioned Kind, but in conjunction with the complementary feed also for other devices with a feed and optionally a rotary drive, for example for Bar or tube pressing devices.
  • the locking piece is preferably with at least a key surface for the rotationally fixed fixing of the boom section when screwing to the next one Linkage shot provided. Furthermore, the locking piece have a stop surface and inside of the rod section, a tubular filler from a Material with a relatively low specific Weight, for example made of plastic. This filler serves the opening cross-section of a tubular drill pipe on the for the Passing through a flushing, cutting, lubricating or steering fluid reduce necessary measure and considering its relatively low specific weight the total weight of the pipe weft is as low as possible to keep.
  • the device shown consists of a box-shaped Frame 1, in which on a not shown Carriage parallel two propulsion cylinders 2,3 are arranged, the piston rods 4,5 on the Support the rear end wall 6 of the housing 1.
  • the two Hydraulic cylinders 2, 3 are rigid via a bolt 7 connected to each other, on the middle of another cylinder 8 is stored.
  • the piston rod 9 of the middle Cylinder 8 carries one shown only schematically in Fig. 2 Console 10 on which a rotary drive 11 is mounted is.
  • the drive shaft of the rotary drive 11, not shown is rotatably connected to a plug-in coupling 12 which from a chuck 14 and a locking piece 15 on End of a rod section 16 there.
  • the boom shot 16 is aligned with a rod guide 17 on the front end wall 18 of the frame 1 and is on his front end with a slightly conical screw coupling 19 provided with an internal thread 20, which is based on the rear end of a passing first shot, for example with a drilling tool and / or a steering surface and / or a device for locating the boom tip or one already in the ground, not shown
  • the internal thread can of course also be corresponding Screw threaded pieces of broaching or expanding tools, if the linkage, for example, as a pull linkage is used.
  • the rod section 16 has a stepped bore 21,22, in the larger section 22 there is a tubular Filler 23 is located, the longitudinal bore 24 approximately has the same cross-section as the bore 21. This packing serves the weight of the boom section 16 and the clear width of the bore section 21 to decrease.
  • the screw coupling 19 opposite, rear End of the rod section 16 consists of a front Section 25 with an external thread 26 which with the internal thread 20 at the other end of the rod section corresponds and serves two similar boom sections to screw together.
  • the front section 25 close two similar stops each with two stop surfaces 28, 29 and another Section 30 with two opposite one another Key faces 31, 32.
  • the key areas own rounded lower edges, which facilitate the intervention and by rotating the boom section in the chuck 14 enable axial locking on the chuck.
  • the locking piece from the two sections 26.30 and two stops 27 can be radial Insert slot 33 into chuck 14 from above so that with an axial displacement of the rod section 16 the rear end 25 partially in a bowl 34th with a feed line 35 for a flushing, lubricating, Cutting and steering fluid intervenes.
  • the rotary drive 11 is connected to a limit switch, not shown, who ensures that the insertion slot 33 at resting feed 14 always points upwards.
  • the bowl prevents the rod section 16 or its Locking piece 15 when turning the chuck 14 out the radial slot 33 falls out. With such a turning hits at least one of the two stop surfaces 28, 29 of the stops 27 to one of two corresponding, stop surfaces not shown in the drawing Inside of the chuck 14, which acts as a driver for the boom section 16 act so that its internal thread 20 on the external thread 26 or the rear End of a boom already in the ground in Screw the shape of the threaded portion 25.
  • a radially movable with respect to the linkage Sliding piece 38 with a holding claw 39 Located on the front end wall 18 of the frame 1 below the rod guide 17 with two guide jaws 36,37 a radially movable with respect to the linkage Sliding piece 38 with a holding claw 39.
  • This holding claw is articulated with a two-armed hand or foot lever 40 connected, the pivot pin 41 in a vertical slot 42 of the sliding piece 38 is guided under the influence of two return springs fixed to the frame 43 stands. These return springs move the sliding piece 38 with the holding claw 39 in the rest position 7, from which the holding claw 39 with the help of the hand or foot lever 40 in the operating position according to Fig. 8 can move.
  • the stop 27 adjacent to the section 25 is not absolutely; it does not have to be that way either like the other attack 27. It is used for the Linkage in cooperation with the claw 39 in the axial To fix direction. This is primarily necessary when the linkage is in relatively loose Soil is located and there is a risk that the forage unintentionally when moving to the rear end of the Linkage or the last link shot hits. ever after the impact force, the linkage can then be unwanted move a bit into the earth and on Coupling with the feed no longer or only with difficulty to be possible. Grabs the holding claw on the section 30 on, then the boom section in question non-rotatably fixed and limit the two shoulders left and right of section 30 the axial movement in both directions.
  • Clamping supports 45, 46 are arranged on the side of the frame 1, with the help of which the frame in a starting pit can be tightened.
  • the device according to the invention is such that it can not only be used in a pit. Much more it is also suitable for an arrangement on a Swivel mount that allows above-ground oblique drilling. It is not so much about the compact Construction.
  • the particular advantages of the invention Quick coupling from the driven chuck on the one hand and the locking piece on the rod section on the other hand, however, are retained.
  • the invention is therefore suitable for all types of earthworks with a rotating rod, especially for Manufacture and pulling or pressing expanding of Earth drilling, to destroy, replace and insert of pipes by pressing, hitting and / or pulling. The insertion can be done by pressing, pulling and Beating happen.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)

Claims (22)

  1. Dispositif pour réaliser et élargir des forages, ainsi que pour détruire et remplacer des conduites enterrées à l'aide d'un entraínement d'avance et d'un entraínement rotatif, caractérisé par un dispositif d'accouplement par emboítement (12) relié à l'entraínement rotatif, qui est composé d'un mandrin à engagement positif (14) et d'un élément de verrouillage complémentaire (15) à l'extrémité d'un tronçon de tige (16).
  2. Dispositif pour réaliser et élargir des forages, ainsi que pour détruire et remplacer des conduites enterrées à l'aide d'un entraínement d'avance et d'un entraínement rotatif, caractérisé par un dispositif d'accouplement par emboítement (12) relié à l'entraínement rotatif, qui présente un mandrin à engagement positif (14) coopérant avec un élément de verrouillage complémentaire (15) situé à l'extrémité d'un tronçon de tige (16) pour réaliser un assemblage par engagement positif
  3. Dispositif selon l'une des revendications 1 et 2, caractérisé en ce que le mandrin (14) possède une ouverture radiale (33) pour y insérer l'élément de verrouillage (15).
  4. Dispositif selon l'une ou plusieurs des revendications 1 à 3, caractérisé en ce que le mandrin (14) est doté d'un godet (34) orienté dans la direction de l'axe de rotation.
  5. Dispositif selon l'une ou plusieurs des revendications 1 à 4, caractérisé en ce qu'une conduite de liquide (35) débouche dans le godet (34) et en ce que le tronçon de tige (16) est composé d'une pièce tubulaire.
  6. Dispositif selon l'une ou plusieurs des revendications 1 à 5, caractérisé en ce que le mandrin (14) possède un col fendu (44) et au moins une butée radiale.
  7. Dispositif selon l'une ou plusieurs des revendications 1 à 6, caractérisé en ce que le mandrin (14) possède au moins une butée axiale (27).
  8. Dispositif selon l'une ou plusieurs des revendications 1 à 7, caractérisé par un bâti (1) équipé d'un guide de tige (17).
  9. Dispositif selon la revendication 8, caractérisé en ce qu'au moins deux vérins d'avance (2, 3, 8) sont placés dans le bâti (1).
  10. Dispositif selon la revendication 8 ou 9, caractérisé en ce que le bâti (1) est doté d'une mâchoire de maintien (39) mobile radialement.
  11. Dispositif selon la revendication 10 équipé d'une tige composée de plusieurs tronçons (16), caractérisé en ce que la mâchoire de maintien (39) est reliée de façon articulée à un levier à deux bras (40) par l'intermédiaire d'une pièce coulissante (38).
  12. Dispositif selon la revendication 11, caractérisé en ce que des ressorts de rappel (43) agissent sur la pièce coulissante (38).
  13. Dispositif selon l'une ou plusieurs des revendications 8 à 12, caractérisé en ce que le bâti (1) est muni de supports de fixation extensibles horizontalement (45, 46).
  14. Dispositif selon l'une ou plusieurs des revendications 1 à 13, caractérisé en ce que la tige présente un taraudage (20) à l'une des extrémités et une pièce de verrouillage (15) dotée d'un filetage extérieur (26) à l'autre extrémité du tronçon de tige.
  15. Dispositif selon l'une ou plusieurs des revendications 1 à 14, caractérisé en ce que la pièce de verrouillage (15) est munie d'une surface faisant office de clavette (31, 32).
  16. Dispositif selon la revendication 15, caractérisé en ce que la surface faisant office de clavette (31, 32) s'étend en forme d'arc de cercle entre des arêtes opposées.
  17. Dispositif selon l'une des revendications 14 à 16, caractérisé en ce que la pièce de verrouillage comporte au moins une butée axiale et/ou une butée radiale (27 ; 28 ; 29).
  18. Dispositif selon l'une ou plusieurs des revendications 1 à 17, caractérisé en ce qu'à l'intérieur de tronçons (16) munis d'un alésage longitudinal (21, 22) est chaque fois disposé un corps tubulaire (23).
  19. Dispositif selon la revendication 18, caractérisé en ce que le matériau dont est constitué le corps de remplissage tubulaire (23) présente une densité inférieure à celui qui constitue les tronçons (16).
  20. Dispositif selon l'une ou plusieurs des revendications 1 à 15, caractérisé en ce que les tronçons de tige (16) peuvent être assemblés entre eux par un filetage (19).
  21. Procédé pour mettre en oeuvre des tiges de forage pour réaliser et élargir des forages, ainsi que pour détruire et remplacer des canalisations enterrées, caractérisé en ce que l'entraínement rotatif (2, 3, 8, 11) introduit une pièce de verrouillage d'un tronçon de tige, qui présente des surfaces faisant fonction de clavette, dans un élément de jonction à engagement positif (14), sachant que l'assemblage entre le tronçon de tige et l'élément de jonction est réalisé par engagement positif, sachant que les tiges sont vissées par le biais de l'entraínement rotatif (2, 3, 8, 11) dans la tige qui se trouve dans le sol.
  22. Procédé selon la revendication 21, caractérisé en ce que l'on utilise un dispositif selon l'une ou plusieurs des revendications 1 à 20.
EP98110952A 1997-06-17 1998-06-16 Dispositif de forage Expired - Lifetime EP0886034B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19725628A DE19725628C1 (de) 1997-06-17 1997-06-17 Bohrvorrichtung
DE19725628 1997-06-17

Publications (3)

Publication Number Publication Date
EP0886034A2 EP0886034A2 (fr) 1998-12-23
EP0886034A3 EP0886034A3 (fr) 1999-11-03
EP0886034B1 true EP0886034B1 (fr) 2004-05-12

Family

ID=7832757

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98110952A Expired - Lifetime EP0886034B1 (fr) 1997-06-17 1998-06-16 Dispositif de forage

Country Status (5)

Country Link
US (1) US6267187B1 (fr)
EP (1) EP0886034B1 (fr)
CA (1) CA2240770A1 (fr)
DE (2) DE19725628C1 (fr)
PL (1) PL326856A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202014009613U1 (de) 2014-12-05 2015-02-12 Tracto-Technik Gmbh & Co. Kg Antrieb einer Erdbohrvorrichtung und Erdbohrvorrichtung
DE102014018100B3 (de) * 2014-12-05 2016-05-04 Tracto-Technik Gmbh & Co. Kg "Antrieb einer Erdbohrvorrichtung, Erdbohrvorrichtung und Verfahren zum Antreiben einer Erdbohrvorrichtung"
EP3029263A1 (fr) 2014-12-05 2016-06-08 TRACTO-TECHNIK GmbH & Co. KG Entrainement d'un dispositif de forage de la terre, dispositif de forage de la terre et procede d'entrainement d'un dispositif de forage de la terre
DE102014017936A1 (de) 2014-12-05 2016-06-09 Tracto-Technik Gmbh & Co. Kg Erdbohrvorrichtung
DE102019001200A1 (de) * 2019-02-20 2020-08-20 TRACTO-TECHNlK GmbH & Co. KG Erdbohrvorrichtung und Verwendung einer Erdbohrvorrichtung
DE102019001204A1 (de) * 2019-02-20 2020-08-20 Tracto-Technik Gmbh & Co. Kg Erdbohrvorrichtung und Verfahren zum Bohren in Erdreich

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Publication number Priority date Publication date Assignee Title
WO2001040699A1 (fr) 1999-12-02 2001-06-07 Tracto-Technik Gmbh Dispositif de tension de cable pour dispositifs d'eclatement/d'elargissement
DE10011994C1 (de) * 1999-12-02 2001-07-19 Tracto Technik Seilzugvorrichtung für Berst-/Aufweitvorrichtungen
US7316280B2 (en) 2001-07-12 2008-01-08 Tracto-Technik Gmbh Method for producing earth boreholes
DE102006033753B4 (de) * 2005-11-21 2015-03-12 Tracto-Technik Gmbh System und Verfahren zum Spannen von Strangabschnitten zu einem Strang
DE102009052335A1 (de) 2009-08-28 2011-03-03 Tracto-Technik Gmbh & Co. Kg Steckkupplung für ein Bohrgestänge und Bohrgestänge
NO333021B1 (no) * 2010-01-26 2013-02-18 West Drilling Products As Anordning og framgangsmåte for boring med kontinuerlig verktøyrotasjon og kontinuerlig borevæsketilførsel
DE102011100926B4 (de) * 2011-05-09 2013-09-05 Roland Hörnstein GmbH & Co. KG Fahrzeughebebühne
DE102022114276A1 (de) 2022-06-07 2023-12-07 TERRA AG für Tiefbautechnik Gestängeabschnitt zum Herstellen eines Gestänges aus mehreren Gestängeabschnitten zur Verbindung mit einem Arbeitsmittel

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202014009613U1 (de) 2014-12-05 2015-02-12 Tracto-Technik Gmbh & Co. Kg Antrieb einer Erdbohrvorrichtung und Erdbohrvorrichtung
DE102014018100B3 (de) * 2014-12-05 2016-05-04 Tracto-Technik Gmbh & Co. Kg "Antrieb einer Erdbohrvorrichtung, Erdbohrvorrichtung und Verfahren zum Antreiben einer Erdbohrvorrichtung"
EP3029259A2 (fr) 2014-12-05 2016-06-08 TRACTO-TECHNIK GmbH & Co. KG Dispositif pour l'entraînement d'un outil de forage
EP3029263A1 (fr) 2014-12-05 2016-06-08 TRACTO-TECHNIK GmbH & Co. KG Entrainement d'un dispositif de forage de la terre, dispositif de forage de la terre et procede d'entrainement d'un dispositif de forage de la terre
DE102014017936A1 (de) 2014-12-05 2016-06-09 Tracto-Technik Gmbh & Co. Kg Erdbohrvorrichtung
DE102014018101A1 (de) 2014-12-05 2016-06-09 Tracto-Technik Gmbh & Co. Kg "Antrieb einer Erdbohrvorrichtung, Erdbohrvorrichtung und Verfahren zum Antreiben einer Erdbohrvorrichtung"
DE102019001200A1 (de) * 2019-02-20 2020-08-20 TRACTO-TECHNlK GmbH & Co. KG Erdbohrvorrichtung und Verwendung einer Erdbohrvorrichtung
DE102019001204A1 (de) * 2019-02-20 2020-08-20 Tracto-Technik Gmbh & Co. Kg Erdbohrvorrichtung und Verfahren zum Bohren in Erdreich
EP3699391A1 (fr) 2019-02-20 2020-08-26 TRACTO-TECHNIK GmbH & Co. KG Dispositif de forage du sol et procédé de forage dans la terre
EP3702576A1 (fr) 2019-02-20 2020-09-02 TRACTO-TECHNIK GmbH & Co. KG Dispositif de forage du sol et utilisation d'un dispositif de forage du sol
US11199059B2 (en) 2019-02-20 2021-12-14 Tracto-Technik Gmbh & Co. Kg Ground drilling device and use of a ground drilling device
DE102019001200B4 (de) 2019-02-20 2023-07-06 TRACTO-TECHNlK GmbH & Co. KG Erdbohrvorrichtung und Verwendung einer Erdbohrvorrichtung

Also Published As

Publication number Publication date
DE59811358D1 (de) 2004-06-17
EP0886034A2 (fr) 1998-12-23
CA2240770A1 (fr) 1998-12-17
US6267187B1 (en) 2001-07-31
DE19725628C1 (de) 1999-03-04
EP0886034A3 (fr) 1999-11-03
PL326856A1 (en) 1998-12-21

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