EP0303159B1 - Spreader for an electric contact assembly - Google Patents

Spreader for an electric contact assembly Download PDF

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Publication number
EP0303159B1
EP0303159B1 EP19880112535 EP88112535A EP0303159B1 EP 0303159 B1 EP0303159 B1 EP 0303159B1 EP 19880112535 EP19880112535 EP 19880112535 EP 88112535 A EP88112535 A EP 88112535A EP 0303159 B1 EP0303159 B1 EP 0303159B1
Authority
EP
European Patent Office
Prior art keywords
spacer
contact
contact spring
contact springs
slots
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
EP19880112535
Other languages
German (de)
French (fr)
Other versions
EP0303159A3 (en
EP0303159A2 (en
Inventor
Gerhard Wehrle
Manfred Ulmer
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.)
Graesslin GmbH
Graesslin KG
Original Assignee
Graesslin GmbH
Graesslin KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Graesslin GmbH, Graesslin KG filed Critical Graesslin GmbH
Publication of EP0303159A2 publication Critical patent/EP0303159A2/en
Publication of EP0303159A3 publication Critical patent/EP0303159A3/en
Application granted granted Critical
Publication of EP0303159B1 publication Critical patent/EP0303159B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/24—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting
    • H01H1/26—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting with spring blade support
    • H01H1/28—Assembly of three or more contact-supporting spring blades

Definitions

  • the invention relates to a spacer for an electrical contact spring set with at least three contact springs arranged one above the other / next to one another at certain intervals, the spacer keeping the two outer contact springs at a certain distance from one another in the region of the contact points, while the middle contact spring, which is formed by a switching star, in particular an electromechanical timer, controlled, can be switched between the two outer contact springs.
  • the middle contact spring has a relatively large through hole for the spacer and its freedom of movement during the contact switching operation (eg CH-A-434 423). Through this through hole, the spacer must not only be pushed during assembly on the spring contact set, but this through hole considerably weakens the cross section of the central contact spring.
  • the invention has for its object to provide a spacer that does not contain these disadvantages, in which the contact springs do not contain cross-sectional holes, which can be easily manufactured and which can in particular be mechanically mounted on a spring contact set without after assembly the contact springs must be readjusted.
  • the comb-shaped design of the spacer makes it easy to plug on possible on the contact springs, without these having to be bent to an extent that readjustment would be necessary. With this comb-shaped spacer, it is also possible to carry out the assembly of the spacer using a machine-guided tool. Another advantage is the simple manufacture of this spacer, which can be produced from an insulating material both by injection molding and by stamping.
  • the new spacer which can be injection molded from a plastic, in its comb-shaped design with three incisions 2 and 3 which are open on one side and which are all open to one another, depending on the view are arranged in parallel.
  • the two outer incisions 2 are made at the desired distance between the two contact springs, not shown in this figure.
  • the width of the outer incisions 2 corresponds to the thickness of the sheet thickness of the contact springs. If necessary, this incision width can also be a fraction larger than the sheet thickness.
  • latch-shaped securing elements 7 are provided, which limit the depth of an incision on the open side, this total incision depth corresponding to the height of the outer contact springs, as the following figure shows. 17 denotes a so-called run-in slope on the edge 11 of the two outer webs 14 of the spacer 1.
  • the middle incision 3 is expediently larger there than the switching path of the middle contact spring, as shown in FIG. 2 in more detail.
  • the two walls 9 are effectively designed as spring elements and are accordingly evaded when the spacer is attached to the contact springs 4, which are thus fixed at the desired distance from one another and to the central contact spring 5.
  • the spacer is secured by the latch-shaped securing elements 7 on the contact springs 4 in a positionally secured manner.
  • two tab-shaped securing elements 8 which are raised at a distance from the thickness of the spacer 1 on a narrow side of the contact spring 5 and which limit the spacer with little longitudinal play in the region of the contact points 6 on both sides, are punched out on the middle contact spring 5 .
  • the cross bar 15 of the spacer 1 can engage in corresponding notches of the outer and / or the middle contact spring 4, 5 for longitudinal securing of the spacer. It is also contemplated that a safeguard against removal or falling of the spacer from the contact set instead of the latch-shaped securing elements 7 can be formed from bolt-shaped securing elements on the walls 9, which engage in holes provided in the contact springs 4.
  • latch-shaped securing elements 7 are provided opposite one another in the area of each of the outer incisions 2, all the webs 14 and walls 9 being designed to be resilient.
  • Fig. 3 denotes the two outer contact springs and 5 the middle contact spring, which together in one side an insulating material carrier 16 are injected, inserted or riveted.
  • 1 denotes the spacer and 18 contact rivets on the contact springs 4 and 5.
  • 8 denotes the two tab-shaped securing elements on the narrow side of the contact spring 5 for the longitudinal limitation of the spacer.
  • FIG. 4 it can be seen how the spacer 1 is snapped onto the spring contact set and fixed in position. 7 there shows a latch-shaped securing element which engages behind the contact spring 4. 8 denotes the tab-shaped securing elements, which are arranged in a raised manner on the central contact spring 5 and fix the spacer in the longitudinal direction of the contact spring.
  • the invention is not limited to spring contact sets with only three contact springs, but it is intended to use the design of the new spacer also for spring contact sets with more than three contact springs arranged one above the other / next to one another.

Landscapes

  • Contacts (AREA)

Description

Die Erfindung betrifft einen Abstandhalter für einen elektrischen Kontaktfedersatz mit mindestens drei, in bestimmten Abständen übereinander/nebeneinander angeordneten, einseitig gelagerten Kontaktfedern, wobei der Abstandhalter die beiden äußeren Kontaktfedern im Bereich der Kontaktpunkte auf einem bestimmten Abstand zueinander hält, während die mittlere Kontaktfeder, die von einem Schaltstern, insbesondere einer elektromechanischen Schaltuhr, gesteuert, zwischen den beiden äussere Kontaktfedern umschaltbar ist.The invention relates to a spacer for an electrical contact spring set with at least three contact springs arranged one above the other / next to one another at certain intervals, the spacer keeping the two outer contact springs at a certain distance from one another in the region of the contact points, while the middle contact spring, which is formed by a switching star, in particular an electromechanical timer, controlled, can be switched between the two outer contact springs.

Bei einem derartigen Abstandhalter ist eine Ausführung erforderlich, die eine rationelle und wirtschaftliche Montage auf einem Federkontaktsatz ermöglicht, ohne daß bei der Montage des Abstandhalters die Kontaktfedern verbogen, oder nach der Montage des Abstandhalters nachjustiert werden müssen.With such a spacer, a design is required which enables rational and economical installation on a spring contact set, without the contact springs being bent during the installation of the spacer, or having to be readjusted after the installation of the spacer.

Bei dem bekanntgewordenen Abstandhalter für elektrische Federkontaktsätze, die im wesentlichen aus einem zylinderförmigen Einzelteil mit an den beiden Enden jeweils einem koaxial angeordneten, im Außendurchmesser kleineren Lagerbolzen, gebildet sind und der zwischen den beiden äußeren Kontaktfedern eingespannt ist, wobei die Lagerbolzen in Löchern in den äusseren Kontaktfedern gelagert sind, ist es erforderlich, daß die mittlere Kontaktfeder ein relativ großes Durchgangsloch für den Abstandhalter und seine Bewegungsfreiheit während des Kontaktumschaltbetriebs aufweist (z.B. CH-A-434 423). Durch dieses Durchgangsloch muß der Abstandhalter bei der Montage auf den Federkontaktsatz nicht nur geschoben werden, sondern dieses Durchgangsloch schwächt in erheblichem Maße den Querschnitt der mittleren Kontaktfeder. Außerdem ist es erforderlich, daß bei der Montage dieser Abstandhalterausführung die mindestens eine der beiden äußeren Kontaktfedern aufgebogen werden muß, um den Abstandhalter in das Durchgangsloch einführen zu können. Dadurch verliert diese aufgebogene Kontaktfeder ihre Winkelgenauigkeit und muß manuell aufwendig nachjustiert werden. Eine maschinengerechte Montage ist bei einem solchen Abstandhalter nicht möglich.In the case of the known spacer for electrical spring contact sets, which are essentially formed from a cylindrical individual part with a coaxially arranged at the two ends, the outer diameter of the smaller bearing bolts, and which is clamped between the two outer contact springs, the bearing bolts in holes in the outer Contact springs are stored, it is necessary that the middle contact spring has a relatively large through hole for the spacer and its freedom of movement during the contact switching operation (eg CH-A-434 423). Through this through hole, the spacer must not only be pushed during assembly on the spring contact set, but this through hole considerably weakens the cross section of the central contact spring. In addition, it is necessary that the at least one of the two outer contact springs must be bent when installing this spacer design in order to be able to insert the spacer into the through hole. As a result, this bent contact spring loses its angular accuracy and has to be manually readjusted in a complex manner. A machine-compatible assembly is not possible with such a spacer.

Der Erfindung liegt die Aufgabe zugrunde einen Abstandhalter zu schaffen, der diese genannten Nachteile nicht enthält, bei dem die Kontaktfedern keine den Querschnitt schwächenden Löcher enthält, der einfach hergestellt werden kann und der insbesondere maschinell auf einen Federkontaktsatz montiert werden kann, ohne daß nach der Montage die Kontaktfedern nachjustiert werden müssen.The invention has for its object to provide a spacer that does not contain these disadvantages, in which the contact springs do not contain cross-sectional holes, which can be easily manufactured and which can in particular be mechanically mounted on a spring contact set without after assembly the contact springs must be readjusted.

Diese Aufgabe wird mit den Merkmalen im kennzeichnenden Teil des Patentanspruchs 1 gelöst und in den Unteransprüchen sind weitere vorteilhafte Merkmale beansprucht. Durch die kammförmige Ausbildung des Abstandhalters ist ein einfaches Aufstekken auf die Kontaktfedern möglich, ohne daß diese in einem Maße verbogen werden müßten, daß eine Nachjustierung erforderlich wäre. Mit diesem kammförmigen Abstandhalter ist es außerdem möglich, mittels eines maschinengeführten Werkzeuges die Montage des Abstandhalters vorzunehmen. Vorteilhaft ist ferner die einfache Herstellung dieses Abstandhalters der sowohl spritztechnisch als auch stanztechnisch aus einem Isolierstoff gefertigt werden kann.This object is achieved with the features in the characterizing part of patent claim 1 and further advantageous features are claimed in the subclaims. The comb-shaped design of the spacer makes it easy to plug on possible on the contact springs, without these having to be bent to an extent that readjustment would be necessary. With this comb-shaped spacer, it is also possible to carry out the assembly of the spacer using a machine-guided tool. Another advantage is the simple manufacture of this spacer, which can be produced from an insulating material both by injection molding and by stamping.

Ein Ausführungsbeispiel der Erfindung wird in der Zeichnung dargestellt und im folgenden näher erläutert. Es zeigen

Fig. 1
eine Vorderansicht auf einen Abstandhalter,
Fig. 2
eine Querschnittsansicht durch einen Kontaktsatz mit aufgesetztem neuen Abstandhalter,
Fig. 3
eine Draufsicht auf einen Kontaktsatz mit neuem Abstandhalter und
Fig. 4
eine Seitenansicht auf die Anordnung nach Fig. 3.
An embodiment of the invention is illustrated in the drawing and explained in more detail below. Show it
Fig. 1
a front view of a spacer,
Fig. 2
2 shows a cross-sectional view through a contact set with a new spacer attached,
Fig. 3
a plan view of a contact set with a new spacer and
Fig. 4
3 shows a side view of the arrangement according to FIG. 3.

Die Fig. 1 zeigt den neuen Abstandhalter, der aus einem Kunststoff gespritzt sein kann in seiner kammförmigen Ausführung mit drei übereinander/nebeneinander -je nach Ansicht- liegenden einseitig offenen Einschnitten 2 und 3, die alle zueinander parallelverlaufend angeordnet sind. Die beiden äußeren Einschnitte 2 sind dabei im Sollabstand der beiden, in dieser Figur nicht gezeigten Kontaktfedern angelegt. Die Breite der äußeren Einschnitte 2 entspricht gleich der Dicke der Blechstärke der Kontaktfedern. Erforderlichenfalls kann diese Einschnittbreite auch um Bruchteile größer sein als die Blechstärke. Auf der offenen Seite der Einschnitte 2 sind im Bereich der inneren Einschnitt-Wandungen 9 rastklinkenförmige Sicherungselemente 7 vorgesehen, die die Tiefe eines Einschnitts auf der offenen Seite begrenzen, wobei diese Einschnittgesamttiefe der Höhe der äußeren Kontaktfedern entspricht, wie die folgende Figur zeigt. 17 bezeichnet eine sogenannte Einlaufschräge an der Kante 11 der beiden äußeren Stege 14 des Abstandhalters 1. Der mittlere Einschnitt 3 ist dort zweckmäßigerweise größer als der Schaltweg der mittleren Kontaktfeder, wie dies die Fig. 2 näher zeigt.1 shows the new spacer, which can be injection molded from a plastic, in its comb-shaped design with three incisions 2 and 3 which are open on one side and which are all open to one another, depending on the view are arranged in parallel. The two outer incisions 2 are made at the desired distance between the two contact springs, not shown in this figure. The width of the outer incisions 2 corresponds to the thickness of the sheet thickness of the contact springs. If necessary, this incision width can also be a fraction larger than the sheet thickness. On the open side of the incisions 2 in the area of the inner incision walls 9 latch-shaped securing elements 7 are provided, which limit the depth of an incision on the open side, this total incision depth corresponding to the height of the outer contact springs, as the following figure shows. 17 denotes a so-called run-in slope on the edge 11 of the two outer webs 14 of the spacer 1. The middle incision 3 is expediently larger there than the switching path of the middle contact spring, as shown in FIG. 2 in more detail.

In dieser Fig. 2 ist sichtbar, wie der Abstandhalter 1 auf die beiden äußeren Kontaktfedern 4 aufgesteckt ist. Die beiden Wandungen 9 sind als Federelemente wirksam ausgebildet und sind beim Aufstecken des Abstandhalters dementsprechend den Kontaktfedern 4 ausgewichen, die damit winkelgenau im Sollabstand zueinander und zur mittleren Kontaktfeder 5 fixiert sind. Der Abstandhalter ist durch die rastklinkenförmigen Sicherungselemente 7 auf den Kontaktfedern 4 lagengesichert befestigt. Zur Lagenfixierung und Sicherung in Längsrichtung der Kontaktfedern 4 und 5 ist es vorgesehen, daß an der mittleren Kontaktfeder 5 zwei im Abstand der Dicke des Abstandhalters 1 auf einer Schmalseite der Kontaktfeder 5 erhaben angeordnete laschenförmige Sicherungselemente 8 ausgestanzt sind, die den Abstandshalter mit geringem Längsspiel im Bereich der Kontaktpunkte 6 beidseitig begrenzen.2 shows how the spacer 1 is attached to the two outer contact springs 4. The two walls 9 are effectively designed as spring elements and are accordingly evaded when the spacer is attached to the contact springs 4, which are thus fixed at the desired distance from one another and to the central contact spring 5. The spacer is secured by the latch-shaped securing elements 7 on the contact springs 4 in a positionally secured manner. For position fixing and securing in the longitudinal direction of the contact springs 4 and 5, it is provided that two tab-shaped securing elements 8, which are raised at a distance from the thickness of the spacer 1 on a narrow side of the contact spring 5 and which limit the spacer with little longitudinal play in the region of the contact points 6 on both sides, are punched out on the middle contact spring 5 .

In diesem Zusammenhange mit der Lagenfixierung des Abstandhalters auf dem Federkontaktsatz sind auch andere Ausführungen und Anordnungen denkbar und vorgesehen. So ist daran gedacht, daß der Quersteg 15 des Abstandshalters 1 in entsprechende Auskerbungen der äußeren und/oder der mittleren Kontaktfeder 4, 5 zur Längssicherung des Abstandhalters eingreifen kann. Auch ist daran gedacht, daß eine Sicherung gegen ein Abnehmen oder ein Abfallen des Abstandhalters vom Kontaktsatz anstelle der rastklinkenförmigen Sicherungselemente 7, aus bolzenförmigen Sicherungselementen an den Wandungen 9 gebildet sein kann, die in vorgesehene Löcher in den Kontaktfedern 4 eingreifen.In this connection with the position fixing of the spacer on the spring contact set, other designs and arrangements are also conceivable and provided. So it is contemplated that the cross bar 15 of the spacer 1 can engage in corresponding notches of the outer and / or the middle contact spring 4, 5 for longitudinal securing of the spacer. It is also contemplated that a safeguard against removal or falling of the spacer from the contact set instead of the latch-shaped securing elements 7 can be formed from bolt-shaped securing elements on the walls 9, which engage in holes provided in the contact springs 4.

Außerdem ist es vorgesehen, daß die rastklinkenförmigen Sicherungselemente 7 einander gegenüberliegend im Bereich eines jeden der äußeren Einschnitte 2 vorgesehen sind, wobei alle Stege 14 und Wandungen 9 federelastisch ausgebildet sind.In addition, it is provided that the latch-shaped securing elements 7 are provided opposite one another in the area of each of the outer incisions 2, all the webs 14 and walls 9 being designed to be resilient.

In der Fig. 3 bezeichnet 4 die beiden äußeren Kontaktfedern und 5 die mittlere Kontaktfeder, welche zusammen einseitig in einem Isolierstoffträger 16 eingespritzt, eingelegt oder eingenietet sind. 1 bezeichnet den Abstandhalter und 18 Kontaktnieten auf den Kontaktfedern 4 und 5. 8 kennzeichnet die beiden laschenförmigen Sicherungselemente auf der Schmalseite der Kontaktfeder 5 zur Längsbegrenzung des Abstandhalters.In Fig. 3, 4 denotes the two outer contact springs and 5 the middle contact spring, which together in one side an insulating material carrier 16 are injected, inserted or riveted. 1 denotes the spacer and 18 contact rivets on the contact springs 4 and 5. 8 denotes the two tab-shaped securing elements on the narrow side of the contact spring 5 for the longitudinal limitation of the spacer.

Aus der Fig. 4 ist ersichtlich, wie der Abstandhalter 1 auf den Federkontaktsatz aufgerastet und lagenfixiert ist. 7 zeigt dort ein rastklinkenförmiges Sicherungselement, das die Kontaktfeder 4 hintergreift. 8 bezeichnet die laschenförmigen Sicherungselemente, welche erhaben an der mittleren Kontaktfeder 5 angeordnet den Abstandhalter in Kontaktfederlängsrichtung lagefixieren.From Fig. 4 it can be seen how the spacer 1 is snapped onto the spring contact set and fixed in position. 7 there shows a latch-shaped securing element which engages behind the contact spring 4. 8 denotes the tab-shaped securing elements, which are arranged in a raised manner on the central contact spring 5 and fix the spacer in the longitudinal direction of the contact spring.

Die Erfindung beschränkt sich nicht nur auf Federkontaktsätze mit nur drei Kontaktfedern, sondern es ist daran gedacht die Ausführung des neuen Abstandhalters auch für Federkontaktsätze mit mehr als drei übereinander/nebeneinander angeordneten Kontaktfedern zu verwenden.The invention is not limited to spring contact sets with only three contact springs, but it is intended to use the design of the new spacer also for spring contact sets with more than three contact springs arranged one above the other / next to one another.

Claims (9)

  1. A spacer for an electric contact spring assembly comprising at least three contact springs (4, 5) arranged above/beside one another at defined intervals and mounted on one side, which maintains the two outer contact springs (4) at a defined interval in the region of the contact points (6), whilst the central contact spring (5), which is controlled by a star wheel, in particular an electromechanical time switch, can be switched over between the two outer contact springs (4), characterised in that the spacer (1) is of comb-like formation and comprises at least three slots (2, 3) which are disposed above/beside one another and are open on one side, that the two outer slots (2), extending in parallel to one another, are arranged with the theoretical spacing of the two outer contact springs (4), that the width of these slots (2) is equal to, or a fraction greater than, the sheet metal thickness of a contact spring (4), that the width of the central slot (3) is greater than the switching path of the central contact spring (5) in the region of the contact points (6), and that the spacer (1), mounted on the two outer contact springs (4), is fixed in position on the contact springs (4) by retaining elements (7, 8).
  2. A spacer as claimed in Claim 1, characterised in that detent-like retaining elements (7), which are each directed towards the side of the slots (2) and delimit the depth of a slot (2) to the height of the contact spring (4), are provided on the walls (9) between the two outer slots (2) and the central slot (3).
  3. A spacer as claimed in Claims 1 and 2, characterised in that the walls (9) are designed to function as spring elements.
  4. A spacer as claimed in Claims 1 to 3, characterised in that the slot surface (12) of the walls (9) which adjoins and acts on the respective contact spring (4) is of narrow, in particular edge-like formation.
  5. A spacer as claimed in Claim 1 to 4, characterised in that the edges (11) disposed opposite the walls (9) are provided with a lead-in bevel (12) at the entry to the slots (2).
  6. A spacer as claimed in Claims 1 to 5, characterised in that retaining elements (8) for fixing the spacer (1) in position on the contact spring assembly are provided on the spacer (1) in the region of the base (13) of the central slot (3) and/or on the contact springs (4, 5), in particular on the central contact spring (5).
  7. A spacer as claimed in Claim 6, characterised in that two lug-like retaining elements (8) and raised to the width of the contact springs (5), spaced by an interval corresponding to the thickness of the spacer (1) are arranged on the central contact spring (5) in the vicinity of the contact points (6).
  8. A spacer as claimed in Claims 1 to 7, characterised in that the spacer (1) is produced from synthetic resin by injection moulding.
  9. A spacer as claimed in Claims 1 to 7, characterised in that the spacer (1) is punched from a plate-like insulating material.
EP19880112535 1987-08-13 1988-08-02 Spreader for an electric contact assembly Expired - Lifetime EP0303159B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8711023U 1987-08-13
DE8711023U DE8711023U1 (en) 1987-08-13 1987-08-13

Publications (3)

Publication Number Publication Date
EP0303159A2 EP0303159A2 (en) 1989-02-15
EP0303159A3 EP0303159A3 (en) 1990-08-01
EP0303159B1 true EP0303159B1 (en) 1993-02-10

Family

ID=6811042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880112535 Expired - Lifetime EP0303159B1 (en) 1987-08-13 1988-08-02 Spreader for an electric contact assembly

Country Status (3)

Country Link
EP (1) EP0303159B1 (en)
DE (1) DE8711023U1 (en)
ES (1) ES2039520T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8904332U1 (en) * 1989-04-07 1989-06-22 Marquardt Gmbh, 7207 Rietheim-Weilheim, De

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB858201A (en) * 1958-08-01 1961-01-11 Venner Ltd Improvements relating to a lever mechanism
CH434423A (en) * 1967-03-07 1967-04-30 Landis & Gyr Ag counter
CH528776A (en) * 1969-07-07 1972-06-15 Novitas Fabrik Elek Scher App Time-controlled, electrical program switch
AU437541B2 (en) * 1969-08-20 1973-07-02 P. R. Mallory & Co. Inc Defrost timer
US3814874A (en) * 1973-03-30 1974-06-04 Mallory & Co Inc P R Cam-actuated timer switch
US4531028A (en) * 1983-12-27 1985-07-23 Emhart Industries, Inc. Timer with improved switch blade arrangement

Also Published As

Publication number Publication date
ES2039520T3 (en) 1993-10-01
EP0303159A3 (en) 1990-08-01
EP0303159A2 (en) 1989-02-15
DE8711023U1 (en) 1987-09-24

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