EP0634238B1 - Apparatus for cooling moulding sand - Google Patents

Apparatus for cooling moulding sand Download PDF

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Publication number
EP0634238B1
EP0634238B1 EP94102687A EP94102687A EP0634238B1 EP 0634238 B1 EP0634238 B1 EP 0634238B1 EP 94102687 A EP94102687 A EP 94102687A EP 94102687 A EP94102687 A EP 94102687A EP 0634238 B1 EP0634238 B1 EP 0634238B1
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EP
European Patent Office
Prior art keywords
sand
cooling
cooling section
bin
bunker
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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
EP94102687A
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German (de)
French (fr)
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EP0634238A1 (en
Inventor
Manfred Kreft
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Joest GmbH and Co KG
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Joest GmbH and Co KG
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Publication of EP0634238A1 publication Critical patent/EP0634238A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying

Definitions

  • the invention is directed to a cooling device of hot foundry sand extracted from a bunker with a cooling section and a spray device for application of cooling water.
  • Applicant's 08 538 is a generic device known in the following a molding sand hopper
  • a vibratory conveyor is assigned as the conveyor and rinsing section is.
  • the vibratory conveyor has an air permeable Floor, a spray device is assigned to it, wherein the conveyor line is encapsulated such that applied Air can discharge steam.
  • the vibratory bowl feeder can be switched on or off.
  • DE-A-1 947 566 describes a method for regulating the Moisture from molding sand is known in a mixing drum the addition of water depending on the power consumption the mixing drum is regulated. A sand cooling is not provided there.
  • the object of the invention is to provide a solution with which is an essentially continuous operation of the cooling device Even with strongly fluctuating sand supply with retention the homogeneity of the chilled sand among fluctuating Operating states is made possible.
  • the sprayed Water volume is regulated so that at the end of the cooling section a qualitative under practically all operating conditions same sand can be removed.
  • the regulation of the water quantities to be sprayed on can be done by Variations in the pulse-pause ratio of the spray nozzles are set will.
  • the extraction device is particularly expedient to use the extraction device as an endless conveyor training with a sand discharge on the cooling section, as it is known in itself, but it is also possible to exit the bunker immediately after the start of the Assign cooling section, whereby between bunker discharge and A controllable discharge roller as the take-off device for the cooling section can be provided.
  • control is carried out so that the Current actual value of the speed of the vibratory conveyor drive is converted as a measure of the sand throughput, whereby from the current sand throughput performance with the help the sand temperature in front of, in and / or behind the cooler control of the amount of water required for cooling becomes.
  • the device essentially becomes from a vibratory conveyor 2, which is in an encapsulation 3 is housed, formed with a molding sand 4 and a molding sand deduction 5.
  • the vibratory conveyor 2 has a drive 6 which, like all device elements in the figures, only hinted at is reproduced.
  • the vibrating conveyor trough has one air-permeable bottom 7 through which by means of a blower 8 air is pressed.
  • the hot sand on the conveyor trough is sprayed with water vapor from nozzles 9, the air from the blower 8 with the resulting water vapor deducted over the nozzle 10, which is indicated by small arrows is.
  • Deduction 12 are in the example shown three level probes 14 to 16 are provided to the respective capture current level and in a symbolic only reproduced process computer 17 feed.
  • in the Throw-in area is at least one temperature sensor 18 to determine the feed temperature of the sand and on Deduction 5 is a temperature sensor 19 for determining the delivery temperature of the sand. This data will also be fed to the process computer 17.
  • the mode of action is as follows:
  • the current speed of the drive is shown on the computer 6 of the vibratory conveyor 2 is detected and from it the funded Amount of sand calculated. Via the temperature sensors 18 and 19 the task and the end temperature are determined, whereby the current level via the level indicators 14 to 16 of the molding sand silo is determined, with the The speed of the trigger element 13 is also recorded as a controlled variable becomes.
  • a control in the Way made using a control algorithm with the help e.g. of a frequency converter the speed of the trigger element is changed so that the fill level of the bunker is approximately remains constant.
  • the amount of water required for cooling is calculated.
  • the metering of the amount of water can be done by relation of the Pulse-pause ratio take place through the opposite the passage time of the sand in the cooler in smaller Periodic spray nozzles 9.
  • a cooler according to the invention can e.g. to 80% of the Peak sand performance can be dimensioned without losing it Limit cooling capacity. It is also achieved that the Cooler continuously despite different sand application can be operated, which ensures the homogeneity of the cooled Sandes remains intact because the above described strong leaps and bounds here do not occur.
  • Task member 13a which in this device 1a as a feed roller 20 is designed.
  • This driven application roller 20 below the 11a designated bunkers within the encapsulation 3 offers a A number of advantages that can occur when the roller is at a standstill no sand runs out of the bunker, there is one lower height, which also ensures that no Rieselsand is created, as is the case with the discharge of belt conveyors is often the case.

Abstract

The intention is, with an apparatus (1) for cooling hot moulding sand taken from a bunker (11), having a cooling section (2, 3) and a spraying device (9) for spraying on cooling water, to provide a solution by means of which essentially continuous operation of the cooling device is made possible even where the supply of sand fluctuates severely, while retaining the homogeneity of the cooled sand under fluctuating operating conditions. It is achieved by virtue of the fact that the bunker (11) is assigned a power-controlled discharge element (13) for supplying the cooling section (2, 3) with hot moulding sand and is also assigned a control device (17) for metering the quantity of water to be sprayed on as a function of the power of the bunker discharge element (13). <IMAGE>

Description

Die Erfindung richtet sich auf eine Vorrichtung zur Kühlung von heißem, aus einem Bunker abgezogenen Gießerei-Formsand mit einer Kühlstrecke und einer Besprüheinrichtung zum Aufbringen von Kühlwasser.The invention is directed to a cooling device of hot foundry sand extracted from a bunker with a cooling section and a spray device for application of cooling water.

Aus "Gießerei", Vol. 66, No. 9, S. 282-285, oder aus der DE-A-30 08 538 der Anmelderin ist eine gattungsgemäße Vorrichtung bekannt, bei der einem Formsand-Aufgabetrichter nachfolgend als Förder- und Spülstrecke ein Schwingförderer zugeordnet ist. Der Schwingförderer weist einen luftdurchlässigen Boden auf, ihm ist eine Sprüheinrichtung zugeordnet, wobei die Förderstrecke derart gekapselt ist, daß aufgebrachte Luft entstehenden Dampf austragen kann. Durch Füllstandsonden unterhalb der Austragsöffnung eines Formsand-Bunkers kann der Schwingförderer an- bzw. ausgeschaltet werden.From "Foundry", Vol. 66, No. 9, pp. 282-285, or from DE-A-30 Applicant's 08 538 is a generic device known in the following a molding sand hopper A vibratory conveyor is assigned as the conveyor and rinsing section is. The vibratory conveyor has an air permeable Floor, a spray device is assigned to it, wherein the conveyor line is encapsulated such that applied Air can discharge steam. By level probes below the discharge opening of a molding sand bunker the vibratory bowl feeder can be switched on or off.

Es hat sich gezeigt, daß die guten Leistungsdaten der bekannten Einrichtung noch verbesserungsfähig sind, insbesondere was die Anpassung an unterschiedliche Durchsatzleistungen angeht. So bedingt eine Start-/Stopp-Steuerung, daß der Schwingförderer mit sämtlichen Aggregaten einschließlich der Wasseraufsprühvorrichtung entweder bei voller Leistung betrieben wird oder still steht. Anpassungen an unterschiedliche Durchsatz-Sandmengen oder auch unterschiedliche Sandaufgabetemperaturen sind kaum möglich, zumal derartige Einrichtungen in der Regel auf die höchstmögliche Sandtemperatur ausgelegt sind, was zwangsläufig zu Überdimensionierungen führen muß.It has been shown that the good performance data of the known Establishment can still be improved, in particular what the adjustment to different throughputs concerns. So a start / stop control requires that the Vibratory conveyor with all units including the Water spray device operated either at full power becomes or stands still. Adjustments to different Throughput sand quantities or different sand feed temperatures are hardly possible, especially since such facilities usually to the highest possible sand temperature are designed, which inevitably leads to oversizing must lead.

Da in einer Gießerei praktisch nie über einen längeren Zeitraum maximale Durchsatzleistungen und maximale Sandaufgabetemperatur gemeinsam auftreten, führt dies zu einem überdimensionierten Kühler, der praktisch keine Leistungsreserven aufweist. Zudem steht die Schwingförderrinne relativ häufig still, was die Homogenität des gekühlten Sandes beeinträchtigt, da es beim Ein- bzw. Ausschalten der Sandzufuhr und des Sandtransportes zu Abweichungen von den gewünschten Temperatur- und Feuchtigkeitswerten des gekühlten Sandes kommt.Since in a foundry it is practically never for a long period of time maximum throughput rates and maximum sand feed temperature occur together, this leads to an oversized Cooler that has virtually no power reserves having. In addition, the vibrating conveyor trough is relatively common silent, which affects the homogeneity of the chilled sand, as it turns on and off the sand supply and of sand transport to deviations from the desired temperature and humidity values of the cooled sand.

Aus der DE-A-1 947 566 ist ein Verfahren zur Regelung der Feuchtigkeit von Formsand bekannt, bei dem in einer Mischtrommel die Zugabe von Wasser in Abhängigkeit von der Leistungsaufnahme der Mischtrommel geregelt wird. Eine Sandkühlung ist dort nicht vorgesehen.DE-A-1 947 566 describes a method for regulating the Moisture from molding sand is known in a mixing drum the addition of water depending on the power consumption the mixing drum is regulated. A sand cooling is not provided there.

Aufgabe der Erfindung ist die Schaffung einer Lösung, mit der ein im wesentlichen kontinuierlicher Betrieb der Kühleinrichtung auch bei stark schwankender Sandzufuhr mit Beibehaltung der Homogenität des gekühlten Sandes unter schwankenden Betriebszuständen ermöglicht wird.The object of the invention is to provide a solution with which is an essentially continuous operation of the cooling device Even with strongly fluctuating sand supply with retention the homogeneity of the chilled sand among fluctuating Operating states is made possible.

Diese Aufgabe wird gemäß der Erfindung durch die kennzeichnenden Merkmale des Hauptanspruches gelöst.This object is achieved according to the invention by the characterizing Features of the main claim solved.

Mit der Erfindung ist es möglich, den Füllstand des Bunkers annähernd konstant zu halten, wobei in Abhängigkeit von der momentanen Leistung sowie der Sandtemperatur die aufzusprühende Wassermenge geregelt wird, so daß am Ende der Kühlstrecke unter praktisch allen Betriebsbedingungen ein qualitativ gleicher Sand entnehmbar ist.With the invention it is possible to fill the level of the bunker keep approximately constant, depending on the current performance and the sand temperature the sprayed Water volume is regulated so that at the end of the cooling section a qualitative under practically all operating conditions same sand can be removed.

Die Regelung der aufzusprühenden Wassermengen kann durch Variationen des Puls-Pausenverhältnisses der Sprühdüsen eingestellt werden.The regulation of the water quantities to be sprayed on can be done by Variations in the pulse-pause ratio of the spray nozzles are set will.

Weitere Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.Further refinements of the invention result from the Subclaims.

Besonders zweckmäßig ist es, das Abzugsorgan als Endlosförderer mit einem Sandabwurf auf die Kühlstrecke auszubilden, wie dies für sich gesehen an sich bekannt ist, es ist aber auch möglich, den Bunkeraustritt unmittelbar dem Beginn der Kühlstrecke zuzuordnen, wobei zwischen Bunkerauswurf und Kühlstreckenbeginn als Abzugsorgan eine regelbare Austragswalze vorgesehen werden kann.It is particularly expedient to use the extraction device as an endless conveyor training with a sand discharge on the cooling section, as it is known in itself, but it is also possible to exit the bunker immediately after the start of the Assign cooling section, whereby between bunker discharge and A controllable discharge roller as the take-off device for the cooling section can be provided.

Erfindungsgemäß wird die Steuerung so vorgenommen, daß der momentane Ist-Wert der Drehzahl des Schwingförderantriebes als Maßzahl für den Sanddurchsatz umgerechnet wird, wobei aus der momentanen Sanddurchsatz-Leistung unter Zuhilfenahme der Sandtemperatur vor, in und/oder hinter dem Kühler die Steuerung der zur Kühlung notwendigen Wassermenge vorgenommen wird.According to the control is carried out so that the Current actual value of the speed of the vibratory conveyor drive is converted as a measure of the sand throughput, whereby from the current sand throughput performance with the help the sand temperature in front of, in and / or behind the cooler control of the amount of water required for cooling becomes.

Die Erfindung ist nachstehend anhand der Zeichnung beispielsweise näher erläutert. Diese zeigt als Prinzipskizzen in den Fig. 1 und 2 zwei Varianten einer erfindungsgemäßen Vorrichtung.The invention is below with reference to the drawing, for example explained in more detail. This shows as a basic sketch 1 and 2, two variants of an inventive Contraption.

Die allgemein mit 1 bezeichnete Vorrichtung wird im wesentlichen von einem Schwingförderer 2, der in einer Kapselung 3 untergebracht ist, gebildet mit einer Formsandaufgabe 4 und einem Formsandabzug 5.The device, generally designated 1, essentially becomes from a vibratory conveyor 2, which is in an encapsulation 3 is housed, formed with a molding sand 4 and a molding sand deduction 5.

Der Schwingförderer 2 weist einen Antrieb 6 auf, der, wie alle Vorrichtungselemente in den Figuren, nur andeutungsweise wiedergegeben ist. Die Schwingförderrinne weist einen luftdurchlässigen Boden 7 auf, durch den mittels eines Gebläses 8 Luft gedrückt wird. Der heiße Sand auf der Förderrinne wird mit Wasserdampf aus Düsen 9 besprüht, die Luft aus dem Gebläse 8 mit dem entstehenden Wasserdampf wird über den Stutzen 10 abgezogen, was durch kleine Pfeile angedeutet ist.The vibratory conveyor 2 has a drive 6 which, like all device elements in the figures, only hinted at is reproduced. The vibrating conveyor trough has one air-permeable bottom 7 through which by means of a blower 8 air is pressed. The hot sand on the conveyor trough is sprayed with water vapor from nozzles 9, the air from the blower 8 with the resulting water vapor deducted over the nozzle 10, which is indicated by small arrows is.

Andeutungsweise ist ein Sandbunker 11 mit einem Auslaß 12 dargestellt, unter dem sich ein als Förderband ausgestaltetes Abzugsorgan 13 befindet, über den der zu behandelnde Formsand in die Aufgabe 4 des Schwingförderers 2 eingebracht wird. Im Abzug 12 sind im dargestellten Beispiel drei Füllstandsonden 14 bis 16 vorgesehen, um den jeweiligen aktuellen Füllstand zu erfassen und in ein nur symbolisch wiedergegebenen Prozeßrechner 17 einzufüttern. Im Bereich des Einwurfes ist wenigstens ein Temperaturfühler 18 zur Bestimmung der Aufgabetemperatur des Sandes und am Abzug 5 ein Temperaturfühler 19 zur Bestimmung der Abgabetemperatur des Sandes vorgesehen. Auch diese Daten werden dem Prozeßrechner 17 zugeführt.There is a hint of a sand bunker 11 with an outlet 12 shown under which there is a conveyor belt Extractor 13 is located on the to be treated Molding sand introduced into task 4 of the vibratory conveyor 2 becomes. Deduction 12 are in the example shown three level probes 14 to 16 are provided to the respective capture current level and in a symbolic only reproduced process computer 17 feed. in the Throw-in area is at least one temperature sensor 18 to determine the feed temperature of the sand and on Deduction 5 is a temperature sensor 19 for determining the delivery temperature of the sand. This data will also be fed to the process computer 17.

Die Wirkungsweise ist dabei die folgende:The mode of action is as follows:

Über den Rechner wird die momentane Drehzahl des Antriebes 6 des Schwingförderers 2 erfaßt und daraus die geförderte Sandmenge errechnet. Über die Temperaturfühler 18 und 19 wird die Aufgabe- und die Endtemperatur ermittelt, wobei über die Füllstandsanzeiger 14 bis 16 der aktuelle Füllstand des Formsand-Silos ermittelt wird, wobei auch die Drehzahl des Abzugsorganes 13 als Regelgröße mit erfaßt wird.The current speed of the drive is shown on the computer 6 of the vibratory conveyor 2 is detected and from it the funded Amount of sand calculated. Via the temperature sensors 18 and 19 the task and the end temperature are determined, whereby the current level via the level indicators 14 to 16 of the molding sand silo is determined, with the The speed of the trigger element 13 is also recorded as a controlled variable becomes.

Je nach Verfahrensparametern wird eine Steuerung in der Weise vorgenommen, daß über einen Regelalgorithmus mit Hilfe z.B. eines Frequenzumrichters die Drehzahl des Abzugsorganes so verändert wird, daß der Füllstand des Bunkers annähernd konstant bleibt.Depending on the process parameters, a control in the Way made using a control algorithm with the help e.g. of a frequency converter, the speed of the trigger element is changed so that the fill level of the bunker is approximately remains constant.

Aus der momentanen Sanddurchsatz-Leistung sowie der Sandtemperatur vor und hinter dem Kühler um die Meßsonden 18 bis 19 wird die zur Kühlung notwendige Wassermenge errechnet. Die Dosierung der Wassermenge kann durch Relation des Puls-Pausenverhältnisses erfolgen, und zwar durch die gegenüber der Durchlaufzeit des Sandes im Kühler in kleinerer Periodendauer getakteten Sprühdüsen 9.From the current sand throughput rate and the sand temperature in front of and behind the cooler around the measuring probes 18 to 19 the amount of water required for cooling is calculated. The metering of the amount of water can be done by relation of the Pulse-pause ratio take place through the opposite the passage time of the sand in the cooler in smaller Periodic spray nozzles 9.

Durch diese Steuerung ist es möglich, einen vollautomatischen Betrieb zu erreichen. Da im Regelfalle mit steigender Durchsatzleistung die Sandtemperatur in derartigen Anlagen sinkt, kann ein erfindungsgemäßer Kühler z.B. auf 80 % der Spitzen-Sandleistung dimensioniert werden, ohne ihn in seiner Kühlleistung zu begrenzen. Auch wird erreicht, daß der Kühler trotz unterschiedlicher Sandaufgabe kontinuierlich betrieben werden kann, wodurch die Homogenität des gekühlten Sandes erhalten bleibt, da die oben eingangs beschriebenen, starken sprunghaften Betriebszustandsänderungen hier nicht auftreten.With this control it is possible to create a fully automatic To achieve operation. As a rule with increasing Throughput performance the sand temperature in such plants decreases, a cooler according to the invention can e.g. to 80% of the Peak sand performance can be dimensioned without losing it Limit cooling capacity. It is also achieved that the Cooler continuously despite different sand application can be operated, which ensures the homogeneity of the cooled Sandes remains intact because the above described strong leaps and bounds here do not occur.

In der Fig. 2 ist ein abgewandeltes Ausführungsbeispiel beschrieben, wobei hier alle Elemente, die mit denen der Fig. 1 übereinstimmen, das gleiche Bezugszeichen tragen.2 a modified embodiment is described, where all elements that match those of Fig. 1 match, bear the same reference numerals.

Der entscheidende Unterschied besteht dort in der Art des Aufgabeorganes 13a, das bei dieser Vorrichtung 1a als Aufgabewalze 20 ausgestaltet ist.The decisive difference is the type of Task member 13a, which in this device 1a as a feed roller 20 is designed.

Diese angetriebene Auftragswalze 20 unterhalb des mit 11a bezeichneten Bunkers innerhalb der Kapselung 3 bietet eine Reihe von Vorteilen, kann bei Stillstand der Walze kann kein Sand aus dem Bunker herauslaufen, es ergibt sich eine geringere Bauhöhe, wobei auch gewährleistet ist, daß kein Rieselsand entsteht, wie dies bei Abwurf von Bandförderern häufig der Fall ist.This driven application roller 20 below the 11a designated bunkers within the encapsulation 3 offers a A number of advantages that can occur when the roller is at a standstill no sand runs out of the bunker, there is one lower height, which also ensures that no Rieselsand is created, as is the case with the discharge of belt conveyors is often the case.

Claims (4)

  1. Apparatus (1) for cooling hot foundry moulding sand which is withdrawn from a bin (11) having a cooling section (2, 3) and a spray device (9) for applying cooling water characterised in that associated with the bin (11) is a continuously output-regulated withdrawal member (13) for supplying the cooling section (2, 3) with hot foundry moulding sand and a regulating device (17) for metering the amount of water to be sprayed on in dependence on the output of the bin withdrawal member (13), wherein the regulating device (17) is designed to influence the pulse-pause ratio of the spray device (9) in dependence on the sand delivery temperature and the sand removal temperature determined by means of measuring probes (18, 19) in the charging region (4) and the discharging region (5) respectively of the cooling section (2, 3).
  2. Apparatus according to claim 1 characterised in that the withdrawal member is in the form of an endless conveyor (11) with a sand discharge on to the cooling section (2, 3).
  3. Apparatus according to claim 1 characterised in that the bin outlet (12) is directly associated with the beginning of the cooling section (2, 3), wherein a regulatable feed roller (20) is provided between the bin outlet (12) and the beginning (4) of the cooling section as the withdrawal member.
  4. Apparatus according to one of the preceding claims characterised in that the cooling section is in the form of an enclosed vibrating conveyor (2) with an air-permeable bottom (7), with a cooling air feed blower (8) beneath the bottom and a vapour outlet (10) at the end of the cooling section.
EP94102687A 1993-07-17 1994-02-23 Apparatus for cooling moulding sand Expired - Lifetime EP0634238B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4324101 1993-07-17
DE4324101A DE4324101A1 (en) 1993-07-17 1993-07-17 Device for cooling foundry molding sand

Publications (2)

Publication Number Publication Date
EP0634238A1 EP0634238A1 (en) 1995-01-18
EP0634238B1 true EP0634238B1 (en) 1998-04-08

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EP94102687A Expired - Lifetime EP0634238B1 (en) 1993-07-17 1994-02-23 Apparatus for cooling moulding sand

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AT (1) ATE164789T1 (en)
DE (2) DE4324101A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011105800A1 (en) 2011-06-17 2012-12-20 Jöst GmbH + Co. KG Processing molding sand, comprises cooling molding sand in cooling zone to form fluidized bed, and crushing agglomerations of sand in inlet and outlet regions of cooling zone and/or into fluidized bed by rotary striking tools s

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2810852B1 (en) * 2000-07-03 2004-10-15 Ate Soc Nouvelle VIBRATING BOTTOM CONQUET
DE10051045C2 (en) † 2000-10-14 2002-11-07 Amos Maschinenfabrik Und Anlag Grape collection container and grape transport vehicle

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1133508B (en) * 1958-05-16 1962-07-19 Pekay Machine & Engineering Co Device for moistening molding sand
CH359246A (en) * 1961-07-14 1961-12-31 Fischer Ag Georg Device for cooling molding sand for foundries
CH480105A (en) * 1968-10-07 1969-10-31 Fischer Ag Georg Method for regulating the humidity of granular masses, in particular of molding sand and device for carrying out the method
DE3008538C2 (en) * 1980-03-06 1986-01-23 Uhde Gmbh, 4600 Dortmund Device for cooling hot foundry molding sand

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011105800A1 (en) 2011-06-17 2012-12-20 Jöst GmbH + Co. KG Processing molding sand, comprises cooling molding sand in cooling zone to form fluidized bed, and crushing agglomerations of sand in inlet and outlet regions of cooling zone and/or into fluidized bed by rotary striking tools s

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ATE164789T1 (en) 1998-04-15
EP0634238A1 (en) 1995-01-18
DE4324101A1 (en) 1995-01-19
DE59405620D1 (en) 1998-05-14

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