EP0444432B2 - Rotor for impact- or hammer-mill - Google Patents

Rotor for impact- or hammer-mill Download PDF

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Publication number
EP0444432B2
EP0444432B2 EP91101421A EP91101421A EP0444432B2 EP 0444432 B2 EP0444432 B2 EP 0444432B2 EP 91101421 A EP91101421 A EP 91101421A EP 91101421 A EP91101421 A EP 91101421A EP 0444432 B2 EP0444432 B2 EP 0444432B2
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EP
European Patent Office
Prior art keywords
rotor
hubs
disks
impact
rotor disks
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
EP91101421A
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German (de)
French (fr)
Other versions
EP0444432A1 (en
EP0444432B1 (en
Inventor
Rolf Dipl.-Ing. König
Gerhard Hemesath
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Hazemag and EPR GmbH
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Hazemag and EPR GmbH
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Publication date
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Application filed by Hazemag and EPR GmbH filed Critical Hazemag and EPR GmbH
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Application granted granted Critical
Publication of EP0444432B1 publication Critical patent/EP0444432B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/26—Details
    • B02C13/30—Driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/26—Details
    • B02C13/28—Shape or construction of beater elements

Definitions

  • the invention relates to a rotor for impact or hammer mills with a shaft and a rotor body supported thereon, the rotor body being composed of several rotor disks welded together from cast steel, the widened, have contacting hubs.
  • a rotor for hammer mills which consists of disks is built on which four warts are placed over the circumference, adjacent warts are welded together so that four continuous, ledges connecting the panes result.
  • This well-known rotor, the only by four axially extending warts made of welded together Last is held together does not have sufficient strength.
  • a rotor for hammer mills which consists of individual disc sectors welded directly to the rotor shaft. Except that the welding of individual disc sectors with the rotor shaft is cumbersome, this type of attachment of the disc sectors there are strength problems on the rotor shaft.
  • Rotors for hammer breakers are known from DE-C 33 27 204 and DE-A 26 05 751, in which the individual disks are each rotatably attached to the rotor shaft are. This individual attachment of the disks on the rotor shaft is complex and leads to a risk of breakage if, for example, the individual panes a tongue and groove connection are attached.
  • the object of the invention is to provide a stable rotor body of the type specified To create kind of that in a simple way and in a simple way can be attached to the rotor shaft in such a way that there is no damage.
  • the inventive design of the rotor results in a stable rotor body, which is not to be guided on the shaft over its entire length needs, but is only supported at both ends on the shaft.
  • For the bearing of the rotor body on the shaft is therefore only a more precise turning of the rotor disks only partially necessary on the two end disks.
  • the rotor disks have a widened outer ring compared to the hub on both sides around the Half of what is narrower than the distance between adjacent outer wreaths for passing one Welding gun to the hubs is required.
  • Rotor is therefore in this preferred embodiment exclusively from the rotor disks manufactured in cast steel and is therefore very cheap to buy Manufacturing.
  • the parts that the form widened outer rim of the rotor disks welding the hubs to create planners Machining contact surfaces for the blow bars are only simple components are and also the production of the holes for the Dowel bolts can be made very precisely, superfluous the very complex processing of a finished Rotors across the entire width.
  • the rotors shown each consist of several in Cast steel rotor disks 1 manufactured with a middle cylindrical opening 2 and a surrounding this wider hub 3 are provided. On the outside They have edge depending on the type of intended on them Crushing tools (hammer 4, blow bars 5) wider bearing bodies 6 and 7. These are in the cases Fig. 1-8 so designed that between the bearing bodies of adjacent rotor disks 1 Gap 8 remains.
  • the hubs 3 of adjacent rotor disks 1 are on their outer edges by ring welds 9 firmly together connected. To produce these ring welds are against each other at the hubs 3 by dowel pins 10 centered and braced rotor disks slowly rotated, being fixed and by column 8 welding machines reaching to the hubs create the weld.
  • the welds After the welds have been made, they are used for final assembly in the hammer mill rotor shown in FIGS. 1 and 2 the hammers 4 held between the discs and their axes 11 are in the bearing body 6 of the end of the rotor in the continuous Receiving holes inserted, while in the 3 and 4 shown impact mill rotor the Blow bars 5 in the edge cutouts 12 from the outside used and by wedges 13 and pressure elements 14 pressed against the bearing body 7 serving for support become.
  • 5 to 8 illustrate that one can use rotor disks different hub width rotors different Can produce width so that with less Warehousing very narrowly differentiated offers possible are.
  • FIGS. 9 and 10 show, only two can Rotor disks 1 may be provided, optionally under Intermediate layer of a hub-like ring 3 ', in Modification of the invention on the disc edges 1 'of Rotor disks 1 axially parallel support beam 15 welded are.
  • the support beams are only after previous welding of the rotor-hub body attached so that even with this for rotors smaller impact mills provided version All-round welding, even automated, is possible.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Pretreatment Of Seeds And Plants (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Saccharide Compounds (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

The invention relates to a rotor for impact or hammer mills, whose rotor discs 1 are made of cast steel and have widened roots 3 which according to the invention are welded to one another at their outer edges. Before the welding process, the rotor discs are joined centred by means of fitted bolts 10 provided in the roots 3. The outer edges of the rotor discs 1 remain - at least initially - unconnected to one another so that the roots 3 can be preferably welded to one another automatically by means of annular welding seams 9. <IMAGE>

Description

Die Erfindung betrifft einen Rotor für Prall- oder Hammermühlen mit einer Welle und einem darauf gelagerten Rotorkörper, wobei der Rotorkörper aus mehreren miteinander verschweißten Rotorscheiben aus Stahlguß besteht, die verbreiterte, einander berührende Naben aufweisen.The invention relates to a rotor for impact or hammer mills with a shaft and a rotor body supported thereon, the rotor body being composed of several rotor disks welded together from cast steel, the widened, have contacting hubs.

Aus DE-U 66 01 200 ist ein Rotor für Hammermühlen bekannt, der aus Scheiben aufgebaut ist, auf die über den Umfang verteilt jeweils vier Warzen aufgesetzt sind, wobei benachbarte Warzen miteinander verschweißt sind, so daß sich vier durchgehende, die Scheiben verbindende Leisten ergeben. Dieser bekannte Rotor, der nur durch vier axial verlaufende, aus miteinander verschweißten Warzen bestehende Leisten zusammengehalten ist, besitzt nicht die genügende Festigkeit.From DE-U 66 01 200 a rotor for hammer mills is known which consists of disks is built on which four warts are placed over the circumference, adjacent warts are welded together so that four continuous, ledges connecting the panes result. This well-known rotor, the only by four axially extending warts made of welded together Last is held together does not have sufficient strength.

Aus DE-B 18 08 322 ist ein Rotor für Hammermühlen bekannt, der aus einzelnen unmittelbar mit der Rotorwelle verschweißten Scheibensektoren besteht. Abgesehen davon, daß das Verschweißen einzelner Scheibensektoren mit der Rotorwelle umständlich ist, dürften sich aus dieser Art der Befestigung der Scheibensektoren auf der Rotorwelle Festigkeitsprobleme ergeben.From DE-B 18 08 322 a rotor for hammer mills is known, which consists of individual disc sectors welded directly to the rotor shaft. Except that the welding of individual disc sectors with the rotor shaft is cumbersome, this type of attachment of the disc sectors there are strength problems on the rotor shaft.

Aus DE-C 33 27 204 und DE-A 26 05 751 sind Rotoren für Hammerbrecher bekannt, bei denen die einzelnen Scheiben jeweils drehfest auf der Rotorwelle befestigt sind. Diese Einzelbefestigung der Scheiben auf der Rotorwelle ist aufwendig und führt zu einer Bruchgefahr, wenn die einzelnen Scheiben beispielsweise durch eine Nut-Keil-Verbindung befestigt sind.Rotors for hammer breakers are known from DE-C 33 27 204 and DE-A 26 05 751, in which the individual disks are each rotatably attached to the rotor shaft are. This individual attachment of the disks on the rotor shaft is complex and leads to a risk of breakage if, for example, the individual panes a tongue and groove connection are attached.

Aus US-A 31 51 816 ist ein aus miteinander verschweißten Scheiben aufgebauter Rotor bekannt, bei dem die beiden äußeren Scheiben und eine mittlere Scheibe durch Keil-Nut-Verbindungen mit der Rotorwelle verbunden sind. Zur Erreichung ausreichender Festigkeit sind die zwischen den äußeren Scheiben liegenden Scheiben durch innere und äußere Ringschweißnähte miteinander verbunden, was einen erhöhten baulichen Aufwand bedeutet.From US-A 31 51 816 is a made up of welded discs Known rotor, in which the two outer discs and a central disc are connected to the rotor shaft by key-groove connections. To achieve sufficient strength is that between the outer panes Washers connected by inner and outer ring welds what means an increased construction effort.

Aufgabe der Erfindung ist es, einen stabilen Rotorkörper der eingangs angegebenen Art zu schaffen, der sich in einfacher Weise herstellen und in einfacher Weise derart auf der Rotorwelle befestigen läßt, daß sich keine Beschädigungen ergeben.The object of the invention is to provide a stable rotor body of the type specified To create kind of that in a simple way and in a simple way can be attached to the rotor shaft in such a way that there is no damage.

Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.This object is achieved by the features of patent claim 1.

Durch die erfindungsgemäße Ausgestaltung des Rotors ergibt sich ein stabiler Rotorkörper, der nicht über seine ganze Länge auf der Welle geführt zu werden braucht, sondern nur an seinen beiden Enden auf der Welle gelagert ist. Zur Lagerung des Rotorkörpers auf der Welle ist daher nur eine genauere Ausdrehung der Rotorscheiben nur teilweise an den beiden Endscheiben notwendig.The inventive design of the rotor results in a stable rotor body, which is not to be guided on the shaft over its entire length needs, but is only supported at both ends on the shaft. For the bearing of the rotor body on the shaft is therefore only a more precise turning of the rotor disks only partially necessary on the two end disks.

Zweckmäßigerweise sind außerhalb der Naben nur Rotorscheibenteile vorhanden, die mit entsprechenden Teilen benachbarter Rotorscheiben einen Abstand haben, der breit genug für das Hindurchführen einer Schweißzange zu den Naben ist. Expediently, only rotor disk parts are present outside the hubs, which are spaced from corresponding parts of adjacent rotor disks, which is wide enough to pass welding tongs to the hubs.

Damit die Schlagleisten trotz der für die Herstellung der Ringschweißnähte erforderlichen Abstände zwischen den Rotorscheiben eine gute Abstützung erhalten und zusätzliche Stützbalken nicht erforderlich werden, weisen gemäß einer weiteren Ausgestaltung der Erfindung die Rotorscheiben einen verbreiterten Außenkranz auf, der im Vergleich zu der Nabe beiderseits um die Hälfte dessen schmaler ist, was als Abstand zwischen benachbarten Außenkränzen für das Hindurchführen einer Schweißzange zu den Naben erforderlich ist.So that the blow bars despite the for the manufacture the required distances between the ring welds the rotor disks receive good support and additional support beams are not required, point according to a further embodiment of the invention the rotor disks have a widened outer ring compared to the hub on both sides around the Half of what is narrower than the distance between adjacent outer wreaths for passing one Welding gun to the hubs is required.

Dieser Abstand ist verhältnismäßig gering (etwa 50 mm), so daß eine ausreichende Stützung der Schlagleisten gegeben ist und außer den Ringschweißnähten keine Schweißarbeiten ausgeführt werden müssen. Der Rotor besteht also bei dieser bevorzugten Ausführung ausschließlich aus den in Stahlguß hergestellten Rotorscheiben und ist infolgedessen sehr billig in der Herstellung.This distance is relatively small (about 50 mm) so that there is sufficient support for the blow bars is given and in addition to the ring welds no welding work needs to be done. The Rotor is therefore in this preferred embodiment exclusively from the rotor disks manufactured in cast steel and is therefore very cheap to buy Manufacturing.

Diese Tatsache ermöglicht es auch, auf einfache Weise die Rotorbreite und damit die Rotorleistung zu variieren. Sieht man für die Herstellung der Rotoren beispielsweise nur zwei Rotorscheiben verschiedener Nabenbreite vor, so lassen sich durch unterschiedliche Kombination solcher Rotorscheiben Rotoren mit voneinander abweichender Breite herstellen, ohne daß dies zusätzliche Kosten verursacht.This fact also makes it easy to vary the rotor width and thus the rotor power. You see for the manufacture of the rotors for example, only two different rotor disks Hub width, so can be different Combination of such rotor disks with rotors from one another produce a different width without this causes additional costs.

Bei kleineren Prallmühlen kann es jedoch aus baulichen Gründen zweckmäßig sein, auf den mit Ringschweißnähten verbundenen Rotorscheiben, wie an sich bekannt, durchgehende achsparallele Stützbalken für die Schlagleisten vorzusehen, die nach der Verbindung der Naben und gegebenenfalls eines zwischengelegten nabenähnlichen Ringes außen an den Scheibenrändern angeschweißt worden sind.With smaller impact mills, however, it can be of structural Reasons to be appropriate on the with ring welds connected rotor disks, as known per se, continuous axially parallel support beams for the blow bars to be provided after the connection of the hubs and if necessary, an interposed hub-like Ring was welded on the outside of the disc edges are.

Erfindungsgemäß ist vorgesehen, die Teile, die den verbreiterten Außenkranz der Rotorscheiben bilden, vor dem Verschweißen der Naben zwecks Schaffung planer Anlageflächen für die Schlagleisten zu bearbeiten. Da die Rotorscheiben mit ihren Naben nur einfache Bauteile sind und auch die Herstellung der Bohrungen für die Paßbolzen sehr genau vorgenommen werden kann, erübrigt sich dadurch das sehr aufwendige Bearbeiten eines fertigen Rotors über die gesamte Breite.According to the invention, the parts that the form widened outer rim of the rotor disks welding the hubs to create planners Machining contact surfaces for the blow bars. There the rotor disks with their hubs are only simple components are and also the production of the holes for the Dowel bolts can be made very precisely, superfluous the very complex processing of a finished Rotors across the entire width.

In der Zeichnung ist die Erfindung veranschaulicht, und zwar zeigen:

Fig. 1 u. 2
einen Rotor einer Hammermühle gemäß der Erfindung im Quer- und Längsschnitt,
Fig. 2 u. 4
einen Rotor einer Prallmühle gem. der Erfindung im Quer- und Längsschnitt,
Fig. 5 bis 8
verschieden breite Prallmühlenrotoren in schematischer Darstellung in kleinerem Maßstab und
Fig. 9 bis 10
einen Rotor für eine kleinere Prallmühle gemäß der Erfindung im Quer- und Längsschnitt.
The invention is illustrated in the drawing, in which:
Fig. 1 u. 2nd
a rotor of a hammer mill according to the invention in cross and longitudinal section,
Fig. 2 u. 4th
a rotor of an impact mill acc. the invention in cross and longitudinal section,
5 to 8
Impact mill rotors of different widths in a schematic representation on a smaller scale and
9 to 10
a rotor for a smaller impact mill according to the invention in cross and longitudinal section.

Die dargestellten Rotoren bestehen je aus mehreren in Stahlguß hergestellten Rotorscheiben 1, die mit einer mittleren zylindrischen Öffnung 2 und einer diese umgebenden breiteren Nabe 3 versehen sind. Am äußeren Rand haben sie je nach der Art des an ihnen vorgesehenen Zerkleinerungswerkzeuge (Schlaghammer 4, Schlagleisten 5) breitere Lagerkörper 6 bzw. 7. Diese sind in den Fällen Fig. 1-8 so ausgebildet, daß zwischen den Lagerkörpern benachbarter Rotorscheiben 1 ein Spalt 8 verbleibt. The rotors shown each consist of several in Cast steel rotor disks 1 manufactured with a middle cylindrical opening 2 and a surrounding this wider hub 3 are provided. On the outside They have edge depending on the type of intended on them Crushing tools (hammer 4, blow bars 5) wider bearing bodies 6 and 7. These are in the cases Fig. 1-8 so designed that between the bearing bodies of adjacent rotor disks 1 Gap 8 remains.

Die Naben 3 benachbarter Rotorscheiben 1 sind an ihren äußeren Kanten durch Ringschweißnähte 9 fest miteinander verbunden. Zur Herstellung dieser Ringschweißnähte werden die an den Naben 3 durch Paßstifte 10 gegeneinander zentrierten und miteinander verspannten Rotorscheiben langsam gedreht, wobei feststehende und durch die Spalte 8 bis an die Naben heranreichende Schweißgeräte die Schweißnaht erzeugen.The hubs 3 of adjacent rotor disks 1 are on their outer edges by ring welds 9 firmly together connected. To produce these ring welds are against each other at the hubs 3 by dowel pins 10 centered and braced rotor disks slowly rotated, being fixed and by column 8 welding machines reaching to the hubs create the weld.

Nach Herstellung der Schweißnähte werden zur Endmontage bei dem in Fig. 1 und 2 dargestellten Hammermühlenrotor die Schlaghämmer 4 zwischen die Scheiben gehalten und ihre Achsen 11 werden in die Lagerkörper 6 von der Stirnseite des Rotors her in die durchgehenden Aufnahmebohrungen eingeschoben, während bei dem in Fig. 3 und 4 dargestellten Prallmühlenrotor die Schlagleisten 5 in die Randausschnitte 12 von außen eingesetzt und durch Keile 13 und Druckelemente 14 gegen die der Abstützung dienenden Lagerkörper 7 gedrückt werden.After the welds have been made, they are used for final assembly in the hammer mill rotor shown in FIGS. 1 and 2 the hammers 4 held between the discs and their axes 11 are in the bearing body 6 of the end of the rotor in the continuous Receiving holes inserted, while in the 3 and 4 shown impact mill rotor the Blow bars 5 in the edge cutouts 12 from the outside used and by wedges 13 and pressure elements 14 pressed against the bearing body 7 serving for support become.

Die Fig. 5 bis 8 veranschaulichen, daß man aus Rotorscheiben unterschiedlicher Nabenbreite Rotoren verschiedener Breite herstellen kann, so daß mit geringer Lagerhaltung sehr eng differenzierte Angebote möglich sind.5 to 8 illustrate that one can use rotor disks different hub width rotors different Can produce width so that with less Warehousing very narrowly differentiated offers possible are.

Wie die Fig. 9 und 10 zeigen, können auch nur zwei Rotorscheiben 1 vorgesehen sein, gegebenenfalls unter Zwischenlage eines nabenähnlichen Ringes 3', wobei in Abwandlung der Erfindung an den Scheibenrändern 1' der Rotorscheiben 1 achsparallele Stützbalken 15 festgeschweißt sind. Dazu werden die Stützbalken erst nach vorhergehendem Zusammenschweißen des Rotor-Naben-Körpers angebracht, so daß auch bei dieser für Rotoren kleinerer Prallmühlen vorgesehenen Ausführung ein Rundumverschweißen, auch automatisiert, möglich ist.As FIGS. 9 and 10 show, only two can Rotor disks 1 may be provided, optionally under Intermediate layer of a hub-like ring 3 ', in Modification of the invention on the disc edges 1 'of Rotor disks 1 axially parallel support beam 15 welded are. For this, the support beams are only after previous welding of the rotor-hub body attached so that even with this for rotors smaller impact mills provided version All-round welding, even automated, is possible.

Claims (6)

  1. A rotor for impact or hammer mills, having a shaft and a rotor body mounted thereon, wherein the rotor body comprises a plurality of cast steel rotor disks (1) which are welded together and have widened hubs (3) touching one another, characterised in that the rotor disks (1) are welded together by annular weld seams (9) at the outer edges of their hubs (3) so as to provide a stable rotor body, and in that die rotor body is mounted only at ist two ends on the rotor shaft.
  2. A rotor according to Claim 1, characterised in that outside the hubs (3) are only those rotor disk parts (6, 7) which together with corresponding parts of adjacent rotor disks provide a gap wide enough to allow the passage of welding tongs to the hubs.
  3. A rotor according to Claim 1 for impact mills, characterised in that the rotor disks (1) have a widened outer rim (7) which, compared with the hub (3), is halb as wide as the hub on both sides, providing the gap between adjacent disks necessary to allow the passage of welding tongs to the hubs (3).
  4. A rotor according to Claim 3, characterised by the use of rotor disks (1) with hubs (3) of differing widths.
  5. A rotor according to Claim 1 for impact mills, characterised in that the rotor disks (1) connected by annular weld seams (9) have continuous axially parallel supporting beams (15) for blow bars (5), said beams being welded to the outside of the disk edges (1') following connection of the hubs (3, 3')
  6. A rotor according to Clam 3, characterised in that the parts forming the widened outer rim (7) of the rotor disks (1) have been machined prior to the welding of the hubs (3) to provide flat mounting surfaces for the blow bars (5).
EP91101421A 1990-03-01 1991-02-04 Rotor for impact- or hammer-mill Expired - Lifetime EP0444432B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4006328 1990-03-01
DE4006328 1990-03-01

Publications (3)

Publication Number Publication Date
EP0444432A1 EP0444432A1 (en) 1991-09-04
EP0444432B1 EP0444432B1 (en) 1993-12-08
EP0444432B2 true EP0444432B2 (en) 2000-10-18

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ID=6401141

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EP91101421A Expired - Lifetime EP0444432B2 (en) 1990-03-01 1991-02-04 Rotor for impact- or hammer-mill

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US (1) US5392999A (en)
EP (1) EP0444432B2 (en)
JP (1) JP3049099B2 (en)
KR (1) KR0168673B1 (en)
AT (1) ATE98137T1 (en)
AU (1) AU634349B2 (en)
BR (1) BR9100821A (en)
CA (1) CA2037308C (en)
DE (1) DE59100672D1 (en)
DK (1) DK0444432T4 (en)
ES (1) ES2048514T5 (en)
GR (1) GR3035276T3 (en)
MX (1) MX174627B (en)
ZA (1) ZA91909B (en)

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US7384011B1 (en) 2001-10-03 2008-06-10 Leward Nile Smith Multi-functional tool assembly for processing tool of waste processing machine
US7726594B2 (en) * 2001-10-03 2010-06-01 Leward Nile Smith Multi-functional tool assembly for processing tool of material processing machine
US6845931B1 (en) 2001-10-03 2005-01-25 Leward Nile Smith Multi-functional tool assembly for processing tool of waste processing machine
US7007874B1 (en) 2002-01-08 2006-03-07 Leward Nile Smith Shroud assembly for waste processing machine
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CA2037308A1 (en) 1991-09-02
EP0444432A1 (en) 1991-09-04
DK0444432T4 (en) 2000-12-04
KR0168673B1 (en) 1999-01-15
ES2048514T5 (en) 2001-01-16
ATE98137T1 (en) 1993-12-15
AU7135591A (en) 1991-09-05
ES2048514T3 (en) 1994-03-16
ZA91909B (en) 1992-02-26
GR3035276T3 (en) 2001-04-30
DE59100672D1 (en) 1994-01-20
AU634349B2 (en) 1993-02-18
JPH04219152A (en) 1992-08-10
KR910016382A (en) 1991-11-05
JP3049099B2 (en) 2000-06-05
BR9100821A (en) 1991-11-05
US5392999A (en) 1995-02-28
MX174627B (en) 1994-05-30
CA2037308C (en) 1998-02-10
DK0444432T3 (en) 1994-03-07
EP0444432B1 (en) 1993-12-08

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