EP0487543B1 - Paper punch - Google Patents

Paper punch Download PDF

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Publication number
EP0487543B1
EP0487543B1 EP90910678A EP90910678A EP0487543B1 EP 0487543 B1 EP0487543 B1 EP 0487543B1 EP 90910678 A EP90910678 A EP 90910678A EP 90910678 A EP90910678 A EP 90910678A EP 0487543 B1 EP0487543 B1 EP 0487543B1
Authority
EP
European Patent Office
Prior art keywords
pressure lever
slide
guide
abutment
elongated hole
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
EP90910678A
Other languages
German (de)
French (fr)
Other versions
EP0487543A1 (en
Inventor
Moritz Steiner
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.)
Esselte Leitz GmbH and Co KG
Original Assignee
Louis Leitz 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6387095&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0487543(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Louis Leitz KG filed Critical Louis Leitz KG
Priority to AT90910678T priority Critical patent/ATE96362T1/en
Publication of EP0487543A1 publication Critical patent/EP0487543A1/en
Application granted granted Critical
Publication of EP0487543B1 publication Critical patent/EP0487543B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/32—Hand-held perforating or punching apparatus, e.g. awls
    • B26F1/36—Punching or perforating pliers

Definitions

  • the invention relates to a letter punch with a lower part, a pivotally mounted on lateral bearing blocks of the lower part, which is guided on the lower part displaceably guided against the restoring force of a spring pressure lever and a stop shoulder arranged on the lower part or on the bearing blocks, against which an arranged on the pressure lever stop member below the action of the restoring force of the spring.
  • Such a letter punch is e.g. through delivery and use by customers of the specialist world from the priority date of this patent application.
  • the stop members have the function of end stops for the pressure lever in the non-actuated and actuated state.
  • the invention has for its object to provide a letter punch of the type mentioned, which has an integrated in the hole punch, easy to manufacture and assemble hold-down for the pressure lever.
  • the invention consists essentially in the fact that the stop member is designed as a one-piece slide made of plastic which can be displaced in an elongated hole in the pressure lever between two end positions and which forms a hold-down stop against the stop shoulder in the one end position when the pressure lever is depressed and the swivel path of the in the other end position Releases the pressure lever.
  • an actuating head is formed on the slide with a neck part which extends through the elongated hole extending transversely in the pressure lever and which has projections which overlap the longitudinal side edges of the elongated hole and which advantageously has its projections aligned in the course of the assembly in the longitudinal direction of the elongated hole Elongated hole can be inserted and locked by rotating the slide by 90 ° together with the slide in a sliding guide aligned parallel to the elongated hole on the pressure lever.
  • the pressure lever advantageously has two guide ribs which are arranged at a distance from one another and are oriented parallel to the elongated hole and form the sliding guide, while the slide has a stop edge facing the stop shoulder, a wedge-shaped or laterally offset edge against the stop edge and guided on one of the guide ribs of the pressure lever first guide edge and one opposite the stop edge and the first guide edge on the second guide rib of the pressure lever has guided second leading edge.
  • a latching tongue preferably arranged on the side of the second guide edge, can be provided on the slide, with which it can be locked in the end position which releases the pivoting path of the pressure lever on a latching member of the pressure lever.
  • the stop edge of the slide is advantageously wedge-shaped relative to the slide plane, so that the major part of the hold-down forces exerted by the return spring is transmitted to the inside of the pressure lever and not only to the relatively narrow second guide rib.
  • the guide ribs, the elongated hole and the counter-latching element for the latching tongue are expediently arranged in the region of an apron which delimits the pressure lever on the end face at the bottom.
  • the cast hole punch shown in FIGS. 1 and 2 essentially consists of a lower hole part 10, two bearing blocks 14 arranged laterally on the lower part 10 and a pressure lever 18 which can be pivoted to a limited extent on the bearing blocks about a pivot axis 16.
  • the pressure lever 18 has two laterally downwards curved bearing tabs 20 which overlap the outside of the bearing blocks 14 and an apron 22 which is bent downward on the end face and connects the bearing tabs to one another.
  • upward-facing cantilevers 24 are formed, which engage under the apron 22 of the pressure lever and against whose upper edge, which forms a stop shoulder 26, a guide and stop rib 30 which projects inward on the pressure lever 18 and is designed as an end stop, under the action of Spring 28 strikes.
  • a slide 32 is arranged such that it can be displaced transversely, which reaches through to the front with a neck part 33 and an actuating head 34 through an elongated hole 36 in the apron 22.
  • the slide 32 designed as an injection molded part made of plastic is aligned with its actuating head 34 in the longitudinal direction of the elongated hole 36 during assembly Projections 38 inserted through the elongated hole and then rotated by 90 °, so that the projections 38 positively overlap the longitudinal side edges of the elongated hole.
  • the lateral guide edges 40, 42 of the slide 32 snap into the area between the two guide ribs 44, 30 protruding towards the inside of the apron.
  • the lower guide edge 40 is inclined relative to the slide plane. Adjacent to it is a stop edge 48 which is inclined towards the opposite side and which, in engagement with the stop shoulder 26 of the adjacent arm 24, serves as a hold-down stop for the pressure lever 18.
  • the upper guide and deflection rib 30 for the slide 32 also forms the end stop which abuts against the stop shoulder 26 of the arm 24.
  • a latching tongue 50 which engages with a latching member 52 in the end position of the slide moved out of the stop position into a counter-latching, not shown, on the pressure lever.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Press Drives And Press Lines (AREA)

Abstract

A paper punch comprises a base part (10), a pressure lever (18) which is pivotally mounted on lateral pillow blocks of the base part (10) and which acts, against the restoring force of a spring (28), on a hole punch slidingly guided on the base part (10), and an impact element (32) which is arranged on the pressure lever (18) and which strikes an impact shoulder (26) arranged on the pillow blocks (14) against the restoring force of the spring (28). The impact element (32) is a one-piece plastic slider (32) which moves perpendicular to the pressure lever between two end positions. In one end position, when the pressure lever (18) is depressed, the impact element forms a lower limit stop which rests against the impact shoulder (26) whereas in the other end position, it frees the pivoting path of the pressure lever (18).

Description

Die Erfindung betrifft einen Brieflocher mit einem Unterteil, einem an seitlichen Lagerböcken des Unterteils schwenkbar gelagerten, auf am Unterteil verschiebbar geführte Lochstempel gegen die Rückstellkraft einer Feder einwirkenden Druckhebel und einer am Unterteil oder an den Lagerböcken angeordneten Anschlagschulter, gegen die ein am Druckhebel angeordnetes Anschlagorgan unter der Einwirkung der Rückstellkraft der Feder anschlägt.The invention relates to a letter punch with a lower part, a pivotally mounted on lateral bearing blocks of the lower part, which is guided on the lower part displaceably guided against the restoring force of a spring pressure lever and a stop shoulder arranged on the lower part or on the bearing blocks, against which an arranged on the pressure lever stop member below the action of the restoring force of the spring.

Ein derartiger Brieflocher ist z.B. durch Lieferung und Benutzung durch Kunden der Fachwelt von dem Prioritätstag dieser Patentanmeldung bekannt geworden.Such a letter punch is e.g. through delivery and use by customers of the specialist world from the priority date of this patent application.

Bei bekannten Brieflochern dieser Art haben die Anschlagorgane die Funktion von Endanschlägen für den Druckhebel im nicht betätigten und betätigten Zustand. Andererseits ist es vor allem bei Brieflochern mit ausladenden Druckhebeln beispielsweise für Transport- und Lagerzwecke erwünscht, den Druckhebel in einer niedergedrückten Stellung zu arretieren. Für Transportzwecke werden meist Niederhalteorgane aus Holz oder Kunststoff verwendet, die nach Gebrauch weggeworfen werden.In known letter punches of this type, the stop members have the function of end stops for the pressure lever in the non-actuated and actuated state. On the other hand, it is particularly desirable in the case of wall punchers with protruding pressure levers, for example for transport and storage purposes, to lock the pressure lever in a depressed position. Hold-down devices made of wood or plastic are mostly used for transport purposes and are thrown away after use.

Der Erfindung liegt die Aufgabe zugrunde, einen Brieflocher der eingangs angegebenen Art zu schaffen, der einen im Locher integrierten, einfach herstellbaren und montierbaren Niederhalter für den Druckhebel aufweist.The invention has for its object to provide a letter punch of the type mentioned, which has an integrated in the hole punch, easy to manufacture and assemble hold-down for the pressure lever.

Zur Lösung dieser Aufgabe werden die im Patentanspruch 1 angegebenen Merkmale vorgeschlagen. Weitere vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den abhängigen Ansprüchen.To achieve this object, the features specified in claim 1 are proposed. Further advantageous refinements and developments of the invention result from the dependent claims.

Die Erfindung besteht im wesentlichen darin, daß das Anschlagorgan als in einem Langloch des Druckhebels zwischen zwei Endstellungen verschiebbarer einstückiger Schieber aus Kunststoff ausgebildet ist, der in der einen Endstellung bei niedergedrücktem Druckhebel einen gegen die Anschlagschulter anliegenden Niederhalteanschlag bildet und in der anderen Endstellung den Schwenkweg des Druckhebels freigibt.The invention consists essentially in the fact that the stop member is designed as a one-piece slide made of plastic which can be displaced in an elongated hole in the pressure lever between two end positions and which forms a hold-down stop against the stop shoulder in the one end position when the pressure lever is depressed and the swivel path of the in the other end position Releases the pressure lever.

Gemäß einer bevorzugten Ausgestaltung der Erfindung ist an dem Schieber ein mit einem Halsteil durch das im Druckhebel quer verlaufende Langloch hindurchgreifender Betätigungskopf angeformt, der die Längsseitenränder des Langloches übergreifende Vorsprünge aufweist und der vorteilhafterweise mit seinen im Zuge der Montage in Längsrichtung des Langlochs ausgerichteten Vorsprüngen durch das Langloch hindurchsteckbar und durch Drehen des Schiebers um 90° gemeinsam mit dem Schieber in einer parallel zum Langloch ausgerichteten Schiebeführung am Druckhebel einrastbar ist. Vorteilhafterweise weist der Druckhebel zu diesem Zweck zwei im Abstand voneinander angeordnete, parallel zum Langloch ausgerichtete, die Schiebeführung bildende Führungsrippen auf, während der Schieber eine der Anschlagschulter zugewandte Anschlagkante, eine gegenüber der Anschlagkante keilförmig angestellte oder seitlich abgesetzte, an einer der Führungsrippen des Druckhebels geführte erste Führungskante und eine der Anschlagkante und der ersten Führungskante gegenüberliegende, an der zweiten Führungsrippe des Druckhebels geführte zweite Führungskante aufweist. Weiter kann an dem Schieber eine vorzugsweise auf der Seite der zweiten Führungskante angeordnete Rastzunge vorgesehen werden, mit der er in der den Schwenkweg des Druckhebels freigebenden Endstellung an einem Rastorgan des Druckhebels arretierbar ist.According to a preferred embodiment of the invention, an actuating head is formed on the slide with a neck part which extends through the elongated hole extending transversely in the pressure lever and which has projections which overlap the longitudinal side edges of the elongated hole and which advantageously has its projections aligned in the course of the assembly in the longitudinal direction of the elongated hole Elongated hole can be inserted and locked by rotating the slide by 90 ° together with the slide in a sliding guide aligned parallel to the elongated hole on the pressure lever. For this purpose, the pressure lever advantageously has two guide ribs which are arranged at a distance from one another and are oriented parallel to the elongated hole and form the sliding guide, while the slide has a stop edge facing the stop shoulder, a wedge-shaped or laterally offset edge against the stop edge and guided on one of the guide ribs of the pressure lever first guide edge and one opposite the stop edge and the first guide edge on the second guide rib of the pressure lever has guided second leading edge. Furthermore, a latching tongue, preferably arranged on the side of the second guide edge, can be provided on the slide, with which it can be locked in the end position which releases the pivoting path of the pressure lever on a latching member of the pressure lever.

Die Anschlagkante des Schiebers ist vorteilhafterweise gegenüber der Schieberebene keilförmig angestellt, so daß der überwiegende Teil der durch die Rückstellfeder ausgeübten Niederhaltekräfte auf die Innenseite des Druckhebels und nicht nur auf die relativ schmale zweite Führungsrippe übertragen wird. Die Führungsrippen, das Langloch und das Gegenrastorgan für die Rastzunge sind zweckmäßig im Bereich einer den Druckhebel stirn-Seitig nach unten begrenzenden Schürze angeordnet.The stop edge of the slide is advantageously wedge-shaped relative to the slide plane, so that the major part of the hold-down forces exerted by the return spring is transmitted to the inside of the pressure lever and not only to the relatively narrow second guide rib. The guide ribs, the elongated hole and the counter-latching element for the latching tongue are expediently arranged in the region of an apron which delimits the pressure lever on the end face at the bottom.

Im folgenden wird die Erfindung anhand eines in der Zeichnung in schematischer Weise dargestellten Ausführungsbeispiels näher erläutert. Es zeigen

Fig. 1
einen Brieflocher mit Niederhalteorgan in schaubildlicher Darstellung;
Fig. 2
einen teilweise geschnittenen seitlichen Umriß des Lochers nach Fig. 1 in Niederhaltestellung;
Fig. 3
eine Draufsicht auf den Niederhalteschieber;
Fig. 4
eine Seitenansicht des Niederhalteschiebers nach Fig. 3;
Fig. 5
eine Stirnseitenansicht des Niederhalteschiebers nach Fig. 3 und 4.
The invention is explained in more detail below with reference to an exemplary embodiment shown schematically in the drawing. Show it
Fig. 1
a letter punch with hold-down device in a graphical representation;
Fig. 2
a partially sectioned side outline of the punch according to Figure 1 in the hold position.
Fig. 3
a plan view of the hold-down slide;
Fig. 4
a side view of the hold-down slide according to Fig. 3;
Fig. 5
3 shows an end view of the hold-down slide according to FIGS. 3 and 4.

Der in den Fig. 1 und 2 dargestellte Gußlocher besteht im wesentlichen aus einem Loche-runterteil 10, zwei am Unterteil 10 seitlich angeordneten Lagerböcken 14 und einem an den Lagerböcken um eine Schwenkachse 16 begrenzt verschwenkbaren Druckhebel 18. Der Druckhebel 18 weist zwei seitlich nach unten gebogene, die Lagerböcke 14 außenseitig übergreifende Lagerlappen 20 sowie eine stirnseitig nach unten gebogene, die Lagerlappen miteinander verbindende Schürze 22 auf. An den Lagerböcken 14 sind stirnseitig nach oben weisende Ausleger 24 angeformt, die unter die Schürze 22 des Druckhebels greifen und gegen deren eine Anschlagschulter 26 bildende Oberkante eine am Druckhebel 18 nach innen überstehende, als Endanschlag ausgebildete, Führungs -und Anschlagrippe 30 unter der Einwirkung der Feder 28 anschlägt.The cast hole punch shown in FIGS. 1 and 2 essentially consists of a lower hole part 10, two bearing blocks 14 arranged laterally on the lower part 10 and a pressure lever 18 which can be pivoted to a limited extent on the bearing blocks about a pivot axis 16. The pressure lever 18 has two laterally downwards curved bearing tabs 20 which overlap the outside of the bearing blocks 14 and an apron 22 which is bent downward on the end face and connects the bearing tabs to one another. On the bearing blocks 14, upward-facing cantilevers 24 are formed, which engage under the apron 22 of the pressure lever and against whose upper edge, which forms a stop shoulder 26, a guide and stop rib 30 which projects inward on the pressure lever 18 and is designed as an end stop, under the action of Spring 28 strikes.

Weiter ist im Bereich der Schürze 22 des Druckhebels ein Schieber 32 querverschiebbar angeordnet, der mit einem Halsteil 33 und einem Betätigungskopf 34 durch ein Langloch 36 in der Schürze 22 zur Vorderseite hindurchgreift.Furthermore, in the area of the apron 22 of the pressure lever, a slide 32 is arranged such that it can be displaced transversely, which reaches through to the front with a neck part 33 and an actuating head 34 through an elongated hole 36 in the apron 22.

Der als Spritzgußteil aus Kunststoff ausgebildete Schieber 32 wird bei der Montage mit seinem Betätigungskopf 34 mit in Längsrichtung des Langlochs 36 ausgerichteten Vorsprüngen 38 durch das Langloch hindurchgesteckt und anschließend um 90° gedreht, so daß die Vorsprünge 38 die Längsseitenränder des Langlochs formschlüssig übergreifen. Gleichzeitig rasten die seitlichen Führungskanten 40,42 des Schiebers 32 in den Bereich zwischen den beiden nach der Schürzeninnenseite überstehenden Führungsrippen 44,30 ein. Die untere Führungskante 40 ist schräg gegenüber der Schieberebene angestellt. Ihr benachbart ist eine nach der gegenüberliegenden Seite schräg angestellte Anschlagkante 48 angeordnet, die im Eingriff mit der Anschlagschulter 26 des benachbarten Auslegers 24 als Niederhalteanschlag für den Druckhebel 18 dient. Die obere Führungs -und Auschlagrippe 30 für den Schieber 32 bildet zugleich den gegen die Anschlagschulter 26 des Auslegers 24 anschlagenden Endanschlag. In der Verlängerung der oberen Führungskante 42 erstreckt sich eine Rastzunge 50, die mit einem Rastorgan 52 in der aus der Anschlagstellung herausgerückten Endstellung des Schiebers in eine nicht dargestellte Gegenrast am Druckhebel einrastet.The slide 32 designed as an injection molded part made of plastic is aligned with its actuating head 34 in the longitudinal direction of the elongated hole 36 during assembly Projections 38 inserted through the elongated hole and then rotated by 90 °, so that the projections 38 positively overlap the longitudinal side edges of the elongated hole. At the same time, the lateral guide edges 40, 42 of the slide 32 snap into the area between the two guide ribs 44, 30 protruding towards the inside of the apron. The lower guide edge 40 is inclined relative to the slide plane. Adjacent to it is a stop edge 48 which is inclined towards the opposite side and which, in engagement with the stop shoulder 26 of the adjacent arm 24, serves as a hold-down stop for the pressure lever 18. The upper guide and deflection rib 30 for the slide 32 also forms the end stop which abuts against the stop shoulder 26 of the arm 24. In the extension of the upper guide edge 42 extends a latching tongue 50, which engages with a latching member 52 in the end position of the slide moved out of the stop position into a counter-latching, not shown, on the pressure lever.

Claims (8)

  1. Paper punch comprising a base (10̸), a pressure lever (18), which is pivotably mounted on lateral mounting blocks (14) of the base and which acts on punch dies which are displaceably guided on the base against the return force of a spring (28), and an abutment shoulder (26), which is arrangea on the base or on the mounting blocks and which is abutted by an abutment element (32) on the pressure lever (18) whilst under the influence of a return force of the spring (28), characterised in that the abutment element is arranged as a one-piece slide (32) of plastic material, which is displaceable between two and positions in an elongated hole (36) of the pressure lever and which, in the one end position and with the pressure lever (18) depressed, forms a holding-dow stop towards the abutment shoulder (26) and, in the other end position, releases the pivot path of the pressure lever (18).
  2. Paper punch according to claim 1, characterised in that an operating head (34), which reaches with a neck part (33) through the elongated hole (36) which extends transversely in the pressure lever (18), is formed onto the slide (32), comprising protrusions (38) which reach over the longitudinal side edges of the elongated hole (36).
  3. Paper punch according to claim 2, characterised in that the operating head (34) is pushed by its protrusions (38), which during assembly are oriented in the longitudinal direction of the elongated hole (36), through the elongated hole (36) and detented by rotating the slide by 90̸° together with the slide (32) in a slide guide on the pressure lever (18), which guide is oriented parallel with the elongated hole (36).
  4. Paper punch according to one of claims 1 to 3. characterised in that the pressure lever (18) comprises two guide webs (44, 30̸), which are arranged at a distance from each other and oriented parallel with the elongated hole (36) and form the slide guide, whereas the slide (32) comprises an abutment edge (48) facing towards the abutment shoulder (26), a first guide edge (40̸) which is applied wedgelike relative to the abutment edge (48) or laterally transposed and guided on one of the guide webs (44) of the pressure lever (18), and a second guide edge (42) which is positioned opposite the abutment edge (48) and the first guide edge (40̸) and is guided on the second guide and abutment web (30̸) of the pressure lever (18).
  5. Paper punch according to claim 4, characterised in that the slide (32) is provided with a detent tongue (50̸), which is arranged at the side of the second guide edge (42) and by means of which it is arrested against a detent element of the pressure lever (18) in an end position which releases the pivot path of the pressure lever (18).
  6. Paper punch according to claim 4 or 5, characterised in that the abutment edge (48) of the slide (32) is set wedgelike relative to the slide plane.
  7. Paper punch according to one of claims 4 to 6, characterised in that the second guide and abutment web (30̸) is also arranged as an end-stopping element which abuts against the abutment shoulder (26).
  8. Paper punch according to one of claims 4 to 7, characterised in that the guide webs (44, 40̸), the elongated hole (36) and the counter-detent element for the detent tongue (50̸) are arranged within the area of an apron (22) which downwardly defines the pressure lever (18) at the front.
EP90910678A 1989-08-14 1990-07-04 Paper punch Expired - Lifetime EP0487543B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90910678T ATE96362T1 (en) 1989-08-14 1990-07-04 MAILHOLE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3926836 1989-08-14
DE3926836 1989-08-14

Publications (2)

Publication Number Publication Date
EP0487543A1 EP0487543A1 (en) 1992-06-03
EP0487543B1 true EP0487543B1 (en) 1993-10-27

Family

ID=6387095

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90910678A Expired - Lifetime EP0487543B1 (en) 1989-08-14 1990-07-04 Paper punch

Country Status (8)

Country Link
EP (1) EP0487543B1 (en)
JP (1) JPH04506185A (en)
KR (1) KR920700859A (en)
CN (1) CN1019770B (en)
DD (1) DD297109A5 (en)
DE (1) DE59003266D1 (en)
ES (1) ES2045934T3 (en)
WO (1) WO1991002632A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130129948A (en) * 2010-10-21 2013-11-29 레고 에이/에스 A toy building set
EP2629863B1 (en) * 2010-10-21 2016-07-27 Lego A/S A toy building set
JP5820183B2 (en) * 2011-08-12 2015-11-24 Ｓｅｉオプティフロンティア株式会社 Optical fiber cutter and optical fiber cutter unit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714857A (en) * 1970-09-09 1973-02-06 Swingline Inc Punch
JPS5212391B2 (en) * 1972-10-02 1977-04-06

Also Published As

Publication number Publication date
DD297109A5 (en) 1992-01-02
CN1049473A (en) 1991-02-27
ES2045934T3 (en) 1994-01-16
KR920700859A (en) 1992-08-10
JPH04506185A (en) 1992-10-29
EP0487543A1 (en) 1992-06-03
DE59003266D1 (en) 1993-12-02
WO1991002632A1 (en) 1991-03-07
CN1019770B (en) 1992-12-30

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