EP0454890A1 - Dispositif de contrôle pour outils de pose de rivets aveugles - Google Patents

Dispositif de contrôle pour outils de pose de rivets aveugles Download PDF

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Publication number
EP0454890A1
EP0454890A1 EP90108412A EP90108412A EP0454890A1 EP 0454890 A1 EP0454890 A1 EP 0454890A1 EP 90108412 A EP90108412 A EP 90108412A EP 90108412 A EP90108412 A EP 90108412A EP 0454890 A1 EP0454890 A1 EP 0454890A1
Authority
EP
European Patent Office
Prior art keywords
electrical
monitoring device
eprom
working stroke
force
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
EP90108412A
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German (de)
English (en)
Other versions
EP0454890B1 (fr
Inventor
Michael Dipl.-Ing. Honsel
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.)
Cesione Epo vvg Befestigungstechnik Beteiligungs G
Original Assignee
Alfred Honsel Nieten- und Metallwarenfabrik & Co GmbH
Honsel Nieten & Metallwarenfab
VVG Befestigungstechnik GmbH and 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8203950&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0454890(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Alfred Honsel Nieten- und Metallwarenfabrik & Co GmbH, Honsel Nieten & Metallwarenfab, VVG Befestigungstechnik GmbH and Co filed Critical Alfred Honsel Nieten- und Metallwarenfabrik & Co GmbH
Priority to EP19900108412 priority Critical patent/EP0454890B1/fr
Priority to DE90108412T priority patent/DE59004439D1/de
Publication of EP0454890A1 publication Critical patent/EP0454890A1/fr
Application granted granted Critical
Publication of EP0454890B1 publication Critical patent/EP0454890B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/28—Control devices specially adapted to riveting machines not restricted to one of the preceding subgroups
    • B21J15/285—Control devices specially adapted to riveting machines not restricted to one of the preceding subgroups for controlling the rivet upset cycle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/0007—Tools for fixing internally screw-threaded tubular fasteners
    • B25B27/0014—Tools for fixing internally screw-threaded tubular fasteners motor-driven

Definitions

  • the invention relates to rivet setting tools, in particular translated devices, such as electrical, hydraulic, pneumatic or hydraulic-pneumatic processing devices.
  • Such rivet setting tools for setting blind rivets or blind rivet nuts are generally known. It is disadvantageous that the proper functioning of blind rivets and blind rivet nuts, especially in the case of translated devices such as electrical, hydraulic and pneumatic processing devices, cannot be determined. This is all the more impossible if blind rivets are used in such a way that the closing head is completely covered. In order to achieve a meaningful quality result, the correct function of blind rivets or blind rivet nuts must be proven several times by a so-called destructive function test on the riveted workpieces. Statistical methods can then be used to specify a certain expected value for the quality of the setting, but it is not possible to identify and correct incorrect setting processes.
  • the invention is therefore based on the object of providing a rivet setting device of the type mentioned at the outset which monitors the setting process of blind rivets or blind rivet nuts and indicates faulty setting processes, which detects the wear of the clamping mechanism and which calculates and displays the maintenance intervals.
  • a force measuring device is installed in the pulling mechanism of the device, which ensures that the rivet setting tool works with a predetermined pulling force.
  • the force measuring device expediently consists of a strain gauge, which converts mechanical stresses into electrical quantities, or a pressure cell, which converts the mechanical stress into an electrical quantity.
  • the correct tractive force is monitored by a monitoring device comparing the electrical quantities with a setpoint stored in an EPROM.
  • the EPROM advantageously contains a plurality of selectable target values which are compared in the monitoring device with the electrical measured variable (actual value).
  • an optical and / or acoustic signal is generated in response to the monitoring device when the predetermined tractive force deviates from the actual value.
  • the monitoring device counts the blind fasteners processed by the device.
  • the monitoring device is expediently arranged in the device or outside.
  • a device for measuring the working stroke of the device is provided.
  • a pressure measuring device lies between the pulling mechanism and a spring and delivers an electrical measured variable proportional to the working stroke.
  • An advantageous embodiment is that the monitoring device reads out the corresponding value of the working stroke.
  • a further development is that a display is provided which shows the results determined by the monitoring device.
  • a special embodiment is that a control panel is provided, via which the desired setpoints and functions are entered and shown on the display.
  • the invention will be explained below using an exemplary embodiment with reference to the drawing.
  • the figure shows the side view of a rivet setting device in which the invention is used.
  • a rivet setting tool 1 is shown in a schematic manner, in which the invention is used.
  • a force measuring device 2 for example a strain gauge, is attached to the front part of a pulling mechanism 3, which ensures that the rivet setting tool 1 works with a predetermined pulling force. It is also conceivable to use all pressure cans suitable for this purpose in order to determine the tensile force.
  • the strain gauge 2, which acts as a force measuring device, serves to measure the tensile force on a blind rivet in order to draw conclusions about a successful setting process, ie to recognize whether a rivet has been successfully set.
  • the strain gauge 2 is attached along the axis on the pulling mechanism 3 so as to measure the normal stresses occurring on the pulling mechanism 3.
  • a deformation or expansion of the pulling mechanism 3 has a direct effect on the deformation of the strain gauge 2, whereby this one the change in length of the pull mechanism 3 experiences electrical change in resistance.
  • the strain gauge 2 accordingly works as a resistance modulator and can be arranged as a resistance element in a Wheatston bridge circuit in order to produce measurable voltage changes that are proportional to the tensile force.
  • the strain gauge 2 thus causes mechanical stresses to be converted into electrical stresses.
  • the analog electrical measured variable supplied by the strain gauge 2 is first digitized in an A / D converter, since the setpoint selected via the control panel is also stored as a digitally stored value, which is stored in a memory, for example an EPROM , is present. Now the measured and digitized actual value can be compared with the specified target value on a digital basis. If the deviation of the comparison value lies outside an additionally predetermined tolerance range, an optical and / or acoustic signal is generated in response to this deviation value, that is, if the setting process has not been carried out in the desired manner.
  • the cross section and the modulus of elasticity of the material used must be known, which is determined by the ratio of tensile force to elongation.
  • Each material has a specific modulus of elasticity and can therefore easily be found in the material tables.
  • the deformation of the tensile mechanism should lie within the linearity range, since this is the only way to establish a well-defined relationship between tensile force, elongation and electrical Changes in resistance of the strain gauge 2 is given. In this way, each tensile force is assigned a specific electrical resistance value.
  • a further measuring device which measures the working stroke of the pull mechanism 3.
  • an optical incremental length encoder is provided, which consists of an optical sensor 11 embedded in the front inner diameter of the housing 10 and of a pulse generator strip 5 attached to the outer circumference of the pulling mechanism 3.
  • the sensor 11 is arranged such that it strokes the pulse generator strip 5 during the pulling process of the pulling mechanism and emits the counting pulses to the monitoring device 4.
  • Each count pulse corresponds to a precisely determined distance, so that the number of count pulses determined corresponds to a very specific distance.
  • the display 8 is attached to the housing 10 and displays the results determined by the monitoring device 4. For this purpose, the monitoring device reads out the determined value from the EPROM and displays it on the display 8.
  • a control panel 9 is provided on the housing 10, the inputs of which are shown on the display 8.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
EP19900108412 1990-05-04 1990-05-04 Dispositif de contrôle pour outils de pose de rivets aveugles Expired - Lifetime EP0454890B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19900108412 EP0454890B1 (fr) 1990-05-04 1990-05-04 Dispositif de contrôle pour outils de pose de rivets aveugles
DE90108412T DE59004439D1 (de) 1990-05-04 1990-05-04 Vorrichtung zur Überwachung von Verarbeitungsgeräten für Blindbefestiger.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19900108412 EP0454890B1 (fr) 1990-05-04 1990-05-04 Dispositif de contrôle pour outils de pose de rivets aveugles

Publications (2)

Publication Number Publication Date
EP0454890A1 true EP0454890A1 (fr) 1991-11-06
EP0454890B1 EP0454890B1 (fr) 1994-01-26

Family

ID=8203950

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900108412 Expired - Lifetime EP0454890B1 (fr) 1990-05-04 1990-05-04 Dispositif de contrôle pour outils de pose de rivets aveugles

Country Status (2)

Country Link
EP (1) EP0454890B1 (fr)
DE (1) DE59004439D1 (fr)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4217901A1 (de) * 1992-05-29 1993-12-02 Honsel Nieten & Metallwarenfab Verfahren zum Bestimmen der Abreißkraft des Zugdornes eines Blindniets und zugehöriges Blindnietsetzgerät
DE4339117A1 (de) * 1993-11-16 1995-05-18 Gesipa Blindniettechnik Verfahren zum Setzen von Blindnieten und Blindnietmuttern und Setzgerät für Blindniete und Blindnietmuttern
DE4401155A1 (de) * 1994-01-17 1995-07-27 Infert Gmbh Verfahren zur Ermittlung von Kraftverläufen beim Nieten dünnwandiger Bauteile
DE4401134A1 (de) * 1994-01-17 1995-07-27 Infert Gmbh Verfahren zur Überwachung der Verarbeitung von Blindbefestigern
FR2724856A1 (fr) * 1994-09-26 1996-03-29 Otalu Sa Soc Dispositif de controle pour le sertissage des ecrous noyes
EP0738551A2 (fr) * 1995-04-20 1996-10-23 Emhart Inc. Système de vérification de la pose de rivets aveugles
EP0738550A2 (fr) * 1995-04-20 1996-10-23 Emhart Inc. Système et méthode de pose de rivets aveugles et vérification de la correction de la pose
EP0936029A1 (fr) * 1997-12-12 1999-08-18 Herbert Schruff Procédé et dispositif pour la pose de chevilles à expansion
WO2001096045A1 (fr) * 2000-06-15 2001-12-20 M.H. Honsel Beteiligungs Gmbh Appareil de pose de rivet
EP1232812A2 (fr) * 2001-02-20 2002-08-21 MS Verwaltungs- und Patentgesellschaft mbH Appareil de rivetage avec capteur de contrôle de l'évacuation des mandrins
DE20210840U1 (de) * 2002-01-21 2003-05-28 Ms Verwaltungs Und Patentgmbh Nietsetzgerät mit Zugspannungs-Messeinrichtung
WO2003059550A1 (fr) * 2002-01-21 2003-07-24 Ms Verwaltungs- Und Patentgesellschaft Mbh Outil de pose comportant un dispositif de mesure de contrainte de traction
WO2003059551A1 (fr) * 2002-01-21 2003-07-24 MS Gerätebau GmbH Outil de pose equipe de systemes de controle de processus de pose
EP1712311A1 (fr) * 2005-04-13 2006-10-18 Newfrey LLC Système de surveillance pour un outil de pose d'éléments de fixation
WO2007031760A1 (fr) * 2005-09-16 2007-03-22 Avdel Uk Limited Systeme de surveillance destine a un outil de placement d'elements de fixation
US7343764B2 (en) 2002-01-21 2008-03-18 Ms Geraetebau Gmbh Placing tool with means for controlling placing processes
EP1992429A1 (fr) 2002-01-21 2008-11-19 MS Gerätebau GmbH Outil de pose doté de moyens de contrôle du processus de pose
WO2009074312A1 (fr) * 2007-12-10 2009-06-18 Hs-Technik Gmbh Procédé pour poser des éléments rivetés au moyen d'un appareil de rivetage portable entraîné par un moteur électrique, et appareil de rivetage
DE19731222B4 (de) * 1997-07-21 2009-10-08 Newfrey Llc, Newark Verfahren zum Ausbilden einer Stanznietverbindung sowie eine Fügevorrichtung für Stanzniete
DE102010013101A1 (de) * 2010-03-29 2011-11-17 Alligator Ventilfabrik Gmbh Ventileinziehhebel
FR2961119A1 (fr) * 2010-06-11 2011-12-16 Ct Tech Des Ind Mecaniques Methode d'evaluation de la qualite du rivetage des assemblages rivetes et dispositif de mise en œuvre
DE102012216838A1 (de) 2012-09-20 2014-06-12 Bayerische Motoren Werke Aktiengesellschaft Nietsetzgerät und Verfahren zur Feststellung der Schiefstellung eines Nietsetzgerätes beim Setzen eines Nietes in wenigstens ein Werkstück
US9339865B2 (en) 2012-08-02 2016-05-17 Richard Bergner Verbindungstechnik Gmbh & Co. Kg Electric drive for a processing tool such as a blind rivet setting appliance, processing tool and method for the closed-loop controlled setting of a rivet with such an electric drive
DE202016103269U1 (de) 2016-06-21 2016-08-02 Heiko Schmidt Handsetzgerät zum Setzen von Blindnietelementen

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105382172B (zh) * 2015-12-15 2017-06-16 眉山中车紧固件科技有限公司 智能铆接监测方法及系统
CN109333438B (zh) * 2018-11-26 2021-06-18 中国航发南方工业有限公司 蜂窝组件分解装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665742A (en) * 1970-02-19 1972-05-30 Smith Corp A O Detecting missing or defective connectors
US3685716A (en) * 1971-04-29 1972-08-22 Rohr Corp Rivet center detector mechanism embodying strain gauge
DE2537793C2 (de) * 1975-08-25 1981-09-17 Alfred Honsel, Nieten- und Metallwarenfabrik, 5758 Fröndenberg Blindnietgerät
GB2094476A (en) * 1981-03-05 1982-09-15 Univ Southampton Stress monitoring apparatus
DE2520662C3 (de) * 1975-05-09 1983-11-03 Wilhelm Fette Gmbh, 2053 Schwarzenbek Einrichtung zum Überwachen der Preßkräfte der Stempel einer Tablettenpresse
US4644785A (en) * 1985-09-06 1987-02-24 Fmc Corporation Hinged strain cell mounting apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665742A (en) * 1970-02-19 1972-05-30 Smith Corp A O Detecting missing or defective connectors
US3685716A (en) * 1971-04-29 1972-08-22 Rohr Corp Rivet center detector mechanism embodying strain gauge
DE2520662C3 (de) * 1975-05-09 1983-11-03 Wilhelm Fette Gmbh, 2053 Schwarzenbek Einrichtung zum Überwachen der Preßkräfte der Stempel einer Tablettenpresse
DE2537793C2 (de) * 1975-08-25 1981-09-17 Alfred Honsel, Nieten- und Metallwarenfabrik, 5758 Fröndenberg Blindnietgerät
GB2094476A (en) * 1981-03-05 1982-09-15 Univ Southampton Stress monitoring apparatus
US4644785A (en) * 1985-09-06 1987-02-24 Fmc Corporation Hinged strain cell mounting apparatus

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4217901A1 (de) * 1992-05-29 1993-12-02 Honsel Nieten & Metallwarenfab Verfahren zum Bestimmen der Abreißkraft des Zugdornes eines Blindniets und zugehöriges Blindnietsetzgerät
EP0572819A1 (fr) * 1992-05-29 1993-12-08 ALFRED HONSEL NIETEN- UND METALLWARENFABRIK GMBH & CO. Méthode de détermination de la force de traction de la tige d'un rivet borgne et appareil de rivetage correspondant
DE4244829C2 (de) * 1992-05-29 2003-01-30 Vvg Befestigungstechnik Beteil Verfahren zum Bestimmen der Abreißkraft eines Zugdorns bei einem Blindniet
US5655289A (en) * 1993-11-16 1997-08-12 Gesipa Blindniettechnik Gmbh Blind-rivet setting device
DE4339117C2 (de) * 1993-11-16 1998-07-16 Gesipa Blindniettechnik Verfahren zur Überwachung des Setzvorgangs von Blindnieten und Blindnietmuttern und Setzgerät für Blindniete und Blindnietmuttern
DE4339117A1 (de) * 1993-11-16 1995-05-18 Gesipa Blindniettechnik Verfahren zum Setzen von Blindnieten und Blindnietmuttern und Setzgerät für Blindniete und Blindnietmuttern
DE4401134A1 (de) * 1994-01-17 1995-07-27 Infert Gmbh Verfahren zur Überwachung der Verarbeitung von Blindbefestigern
DE4401155A1 (de) * 1994-01-17 1995-07-27 Infert Gmbh Verfahren zur Ermittlung von Kraftverläufen beim Nieten dünnwandiger Bauteile
DE4401155C2 (de) * 1994-01-17 1998-02-26 Infert Innovative Fertigungste Verfahren zur Ermittlung von Kraftverläufen beim Nieten dünnwandiger Bauteile
FR2724856A1 (fr) * 1994-09-26 1996-03-29 Otalu Sa Soc Dispositif de controle pour le sertissage des ecrous noyes
EP0738550A3 (fr) * 1995-04-20 1997-01-29 Emhart Inc Système et méthode de pose de rivets aveugles et vérification de la correction de la pose
EP0738551A2 (fr) * 1995-04-20 1996-10-23 Emhart Inc. Système de vérification de la pose de rivets aveugles
EP0738550A2 (fr) * 1995-04-20 1996-10-23 Emhart Inc. Système et méthode de pose de rivets aveugles et vérification de la correction de la pose
EP0738551A3 (fr) * 1995-04-20 1996-11-13 Emhart Inc. Système de vérification de la pose de rivets aveugles
US5661887A (en) * 1995-04-20 1997-09-02 Emhart Inc. Blind rivet set verification system and method
US5666710A (en) * 1995-04-20 1997-09-16 Emhart Inc. Blind rivet setting system and method for setting a blind rivet then verifying the correctness of the set
DE19731222B4 (de) * 1997-07-21 2009-10-08 Newfrey Llc, Newark Verfahren zum Ausbilden einer Stanznietverbindung sowie eine Fügevorrichtung für Stanzniete
DE19731222C5 (de) * 1997-07-21 2016-10-13 Newfrey Llc Verfahren zum Ausbilden einer Stanznietverbindung sowie eine Fügevorrichtung für Stanzniete
EP0936029A1 (fr) * 1997-12-12 1999-08-18 Herbert Schruff Procédé et dispositif pour la pose de chevilles à expansion
EP1166918A1 (fr) * 2000-06-15 2002-01-02 M.H. Honsel Beteiligungs GmbH Outil de rivetage
WO2001096045A1 (fr) * 2000-06-15 2001-12-20 M.H. Honsel Beteiligungs Gmbh Appareil de pose de rivet
DE10029392B4 (de) * 2000-06-15 2004-12-30 M.H. Honsel Beteiligungs-Gmbh Nietsetzgerät
EP1232812A3 (fr) * 2001-02-20 2002-10-09 MS Verwaltungs- und Patentgesellschaft mbH Appareil de rivetage avec capteur de contrôle de l'évacuation des mandrins
EP1232812A2 (fr) * 2001-02-20 2002-08-21 MS Verwaltungs- und Patentgesellschaft mbH Appareil de rivetage avec capteur de contrôle de l'évacuation des mandrins
WO2003059551A1 (fr) * 2002-01-21 2003-07-24 MS Gerätebau GmbH Outil de pose equipe de systemes de controle de processus de pose
DE20210840U1 (de) * 2002-01-21 2003-05-28 Ms Verwaltungs Und Patentgmbh Nietsetzgerät mit Zugspannungs-Messeinrichtung
WO2003059550A1 (fr) * 2002-01-21 2003-07-24 Ms Verwaltungs- Und Patentgesellschaft Mbh Outil de pose comportant un dispositif de mesure de contrainte de traction
US7343764B2 (en) 2002-01-21 2008-03-18 Ms Geraetebau Gmbh Placing tool with means for controlling placing processes
EP1992429A1 (fr) 2002-01-21 2008-11-19 MS Gerätebau GmbH Outil de pose doté de moyens de contrôle du processus de pose
US7802352B2 (en) 2005-04-13 2010-09-28 Newfrey Llc Monitoring system for fastener setting tool
EP1712311A1 (fr) * 2005-04-13 2006-10-18 Newfrey LLC Système de surveillance pour un outil de pose d'éléments de fixation
WO2007031760A1 (fr) * 2005-09-16 2007-03-22 Avdel Uk Limited Systeme de surveillance destine a un outil de placement d'elements de fixation
US7788780B2 (en) 2005-09-16 2010-09-07 Avdel Uk Limited Monitoring system for fastener placing tool
WO2009074312A1 (fr) * 2007-12-10 2009-06-18 Hs-Technik Gmbh Procédé pour poser des éléments rivetés au moyen d'un appareil de rivetage portable entraîné par un moteur électrique, et appareil de rivetage
DE102007059422A1 (de) 2007-12-10 2009-06-18 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Setzen von Nietelementen durch ein von einem Elektromotor angetriebenes portables Nietgerät sowie ein Nietgerät
US9079240B2 (en) 2007-12-10 2015-07-14 Hs-Technik Gmbh Method for placing rivet elements by means of a portable riveting device driven by an electric motor and riveting device
DE102007059422B4 (de) * 2007-12-10 2017-07-13 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Setzen von Nietelementen durch ein von einem Elektromotor angetriebenes portables Nietgerät sowie ein Nietgerät
DE102010013101A1 (de) * 2010-03-29 2011-11-17 Alligator Ventilfabrik Gmbh Ventileinziehhebel
DE102010013101B4 (de) * 2010-03-29 2015-05-21 Alligator Ventilfabrik Gmbh Ventileinziehhebel
FR2961119A1 (fr) * 2010-06-11 2011-12-16 Ct Tech Des Ind Mecaniques Methode d'evaluation de la qualite du rivetage des assemblages rivetes et dispositif de mise en œuvre
US9339865B2 (en) 2012-08-02 2016-05-17 Richard Bergner Verbindungstechnik Gmbh & Co. Kg Electric drive for a processing tool such as a blind rivet setting appliance, processing tool and method for the closed-loop controlled setting of a rivet with such an electric drive
DE102012216838A1 (de) 2012-09-20 2014-06-12 Bayerische Motoren Werke Aktiengesellschaft Nietsetzgerät und Verfahren zur Feststellung der Schiefstellung eines Nietsetzgerätes beim Setzen eines Nietes in wenigstens ein Werkstück
DE202016103269U1 (de) 2016-06-21 2016-08-02 Heiko Schmidt Handsetzgerät zum Setzen von Blindnietelementen

Also Published As

Publication number Publication date
DE59004439D1 (de) 1994-03-10
EP0454890B1 (fr) 1994-01-26

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