EP0278057A1 - Housing insertable contact set - Google Patents

Housing insertable contact set Download PDF

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Publication number
EP0278057A1
EP0278057A1 EP87115616A EP87115616A EP0278057A1 EP 0278057 A1 EP0278057 A1 EP 0278057A1 EP 87115616 A EP87115616 A EP 87115616A EP 87115616 A EP87115616 A EP 87115616A EP 0278057 A1 EP0278057 A1 EP 0278057A1
Authority
EP
European Patent Office
Prior art keywords
contact
housing
insert
arrangement according
barrel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP87115616A
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German (de)
French (fr)
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EP0278057B1 (en
Inventor
Gerhard Dipl.-Ing. Keller
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Schaltbau GmbH
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Schaltbau GmbH
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Publication date
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Publication of EP0278057A1 publication Critical patent/EP0278057A1/en
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Publication of EP0278057B1 publication Critical patent/EP0278057B1/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6591—Specific features or arrangements of connection of shield to conductive members
    • H01R13/6596—Specific features or arrangements of connection of shield to conductive members the conductive member being a metal grounding panel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6591—Specific features or arrangements of connection of shield to conductive members
    • H01R13/6594—Specific features or arrangements of connection of shield to conductive members the shield being mounted on a PCB and connected to conductive members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/719—Structural association with built-in electrical component specially adapted for high frequency, e.g. with filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/73—Means for mounting coupling parts to apparatus or structures, e.g. to a wall
    • H01R13/74—Means for mounting coupling parts in openings of a panel

Definitions

  • the present invention relates generally to a contact insert which can be inserted into a housing and has a mask connection to the housing.
  • the invention relates in particular to a contact arrangement which can be attached to a device housing and has a box-shaped housing and an exchangeable contact insert inserted therein, which is connected to the device housing via a ground connection.
  • the manufacture of the ground contact between the contact inserts and the associated housing, usually a device housing, is accomplished in a conventional manner in that the contact insert is first inserted into an electrically conductive housing, a ground contact being made from the contact insert to the housing and then the ground connection from the Housing to the device housing via a screw connection.
  • this object is achieved in that a radially spring-loaded spring washer is arranged in the radial direction between the contact insert and the housing, which produces the ground connection between the contact insert and the housing.
  • the object according to the invention for a contact arrangement which can be attached to a contact housing is achieved in that the ground connection of the contact insert is formed in two parts and has a contact surface which extends radially up to approximately the edge of the housing and that into a radial gap between the beech housing and em device housing, a radially spring-loaded mass spring ring is used, which is supported on the contact surface and on the device housing.
  • the ground connection is independent of how the can-shaped housing is attached to the device housing. It would be conceivable, for example, that the housing be made of an insulating plastic, which would in no way impair the ground connection between the contact insert and the device housing. Since the spring-loaded mass spring washer is inserted into a gap between the housing and the device housing, the replacement of the contact insert is also unproblematic.
  • the mass spring ring can, for example, already be inserted into the radial gap before the contact insert is inserted.
  • the radial gap between the housing and the device housing is axially open against the direction of insertion of the contact insert.
  • a preferred embodiment of the invention according to the features of claim 4 provides that the mass spring ring has an approximately tubular contact collar which bears radially against the contact surface of the contact insert in the installed state of the mass spring ring.
  • This has the advantage that regardless of the angular position of the mass spring ring to be used, contact is always made with the contact surface of the contact insert.
  • the contact surface of the contact insert can also be designed as a filter disk which projects so far beyond the housing that it is in the contact collar of the Meuse feather ring engages. In this way, a particularly large contact area between the contact collar and the contact insert is produced, which further reduces the contact resistance.
  • the spring action of the mass spring ring is achieved in a simple manner according to the features of claim 5 in that the mass spring ring in connection with the contact collar has an approximately barrel-shaped radially outward, in the installed state supported on the device housing spring body. In this way it is also achieved in a simple manner that the mass spring ring, when it is pushed in before the contact insert, is supported radially on the device housing and is thus already fixed in its position.
  • the spring action of the spring body can be further increased in accordance with the features of claim 6 in that the barrel-shaped spring body is provided with axially aligned longitudinal slots laterally delimited by spring bars. These longitudinal slots have the further advantage that they reduce the pressure surface of the barrel-shaped spring body on the device housing, so that the radially outward pressure forces on the device housing increase. The result of this is that when the mass spring ring is inserted, oxide layers are already scraped off on the device housing, as a result of which the transmission resistance between the mass spring ring and the device housing is further reduced.
  • An embodiment of the invention according to the features of claim 7 provides that the longitudinal slots end in front of the contact collar. This ensures that the contact collar has a closed contact surface.
  • the spring action of the spring ring is evened out according to the features of claim 8 in that the longitudinal slots have approximately the same width as the adjacent spring bars.
  • a large number of longitudinal slots can be provided distributed over the circumference, as a result of which the scraping off of any oxide layers in the device housing is further favored when the mass spring ring is inserted.
  • the longitudinal slots end at a distance from the free end of the barrel-shaped spring body. If you consider that the mass spring ring with the free end of the spring body is first inserted into the radial gap between the housing and the device housing, there is the advantage in particular with very narrow spring bars that they cannot be bent.
  • the length of the longitudinal slots is approximately 5/6 of the length of the barrel-shaped spring body.
  • a preferred embodiment which is reflected in the features of claim 11 provides that the inner diameter of the contact collar is smaller than the inner diameter of the free end of the barrel-shaped spring body.
  • the mass spring ring can be inserted in a simple manner even when the contact insert is already inserted into the housing.
  • the free end fits with play over the filter disk or the contact surface of the ground connection of the contact insert.
  • the inside of the barrel-shaped spring body acts as a lead-in chamfer and thus causes the contact collar to be centered on the filter disk of the contact insert.
  • the elastic mass spring ring according to claim 12 can be produced in a particularly simple manner in that the barrel-shaped spring body and the tubular contact collar are made in one piece from a piece of pipe.
  • the single figure shows a perspective, partially sectioned representation of a contact arrangement 2 built into the front plate 1 of a device housing.
  • the contact arrangement 2 comprises a box-shaped housing 3 which is screwed onto the front plate from the outside thereof.
  • the front plate 1 is provided with a circular opening 4, into which the can-shaped housing 3 projects.
  • the outside diameter of the housing 3 projecting into the opening 4 is smaller than the inside diameter of the opening 4, so that an annular gap 5 remains between the housing 3 and the opening 4.
  • a contact insert 6 is inserted into the housing 3 of the contact arrangement 2 from the inside of the device, that is to say from the right side.
  • the contact insert 6 has a radially elastic locking ring 7, which engages behind a projection on the inside of the housing 3.
  • solder pins 10 surrounding tube capacitors 9 protrude.
  • a circuit board 11 is connected to the solder pins 10.
  • the tube capacitors 9 have a capacitor connecting plate 12 immediately before they protrude from the contact insert 6, which essentially consists of insulating plastic material.
  • a ground disk 13 made of wrought copper alloy is applied, which has through openings 14 for the tube capacitors 9 to which the capacitor connecting plates 12 are soldered to the ground disk 13.
  • solder pins 12 lead axially through the contact insert 6 and are designed as plug sockets 15 on the opposite end of the contact insert 6.
  • the right end of the contact insert 6 and the housing 3 protrude into the housing interior through the opening 4 of the front panel 1 and are aligned with each other.
  • the ground disk 13 attached to the end of the contact insert 6 projects radially slightly beyond the outer edge of the housing 3 in the exemplary embodiment shown here.
  • a mass spring ring 16 is inserted into the annular gap 5 between the housing 3 and the opening 4 of the front plate 1 of the housing.
  • the mass spring ring 16 is designed to be radially elastic and is supported on the one hand on the opening 4 of the front plate 1 and on the other hand on the outer circumference of the mass disk 13.
  • mass spring ring 16 has an approximately tubular contact collar 17 which, in the installed state shown in the drawing, bears radially against the outer circumference of the mass disk 13 of the contact insert 6.
  • the contact collar 17 is adjoined in the axial direction by a spring body 18 curved radially outwards.
  • the spring body 18 is supported in the installed state of the mass spring ring 16 on the front plate 1 delimiting the opening 4.
  • the barrel-shaped spring body 18 is provided with axially aligned longitudinal slots 20 which are laterally delimited by spring bars 19.
  • the longitudinal slots 20 end on the one hand in front of the contact collar 17 and on the other hand at a distance from the free end of the barrel-shaped spring body 18.
  • the length of the longitudinal slots is approximately 5/6 of the length of the barrel-shaped spring body 18.
  • the width of the longitudinal slots is approximately the same as the width of the adjacent spring bars 19.
  • the inner diameter of the contact collar 17 is practically the same large as the inner diameter of the free end 21 of the spring body 18. If the mass disk 13 does not protrude so far radially outwards, the inner diameter of the contact collar 17 can be made correspondingly smaller than that of the free end 21 of the spring body.
  • the manufacture of the mass spring ring 16 can be accomplished in a simple manner from a piece of pipe, the contact collar 17 and barrel-shaped spring body 18 remaining integral with one another.
  • a longitudinal slot can also be formed continuously, so as to achieve a spring effect of the contact collar 17.
  • the spring action of the contact collar 17 could also be achieved by the fact that the longitudinal slots extend into the contact collar and have a curvature radially inwards.
  • the mode of operation of the mass spring ring 16 is described below on the basis of the installation and removal of the contact 16.
  • the mass spring ring 16 with its barrel-shaped spring body 18 is inserted in the annular gap 6 to the left on the right side.
  • the spring bars 19 are slightly radially compressed radially inward, whereby the mass spring ring 16 receives its hold in the opening 4 and on the other hand an oxide layer possibly formed on the opening 4 is scraped off.
  • the mass spring ring 16 is pushed until it abuts the flange of the housing 3.
  • the contact insert 6 is also inserted from the right side to the left into the box-shaped housing 3.
  • the mass disk 13 slides into the contact collar 17 and rests with its outer circumference on the contact collar 17 in a contact-forming manner.
  • the mass disk 13 has on its outer circumference resilient tongues 22 which press resiliently against the contact collar 17. If the mass disk 13 is not designed with such tongues, the contact collar 17 can be provided with a spring effect in that one of the longitudinal slots is formed continuously at one point on the circumference of the mass spring ring.
  • the mass spring ring 16 pre-assembled on the housing 3 is preferably installed together with the housing 3 in the annular gap 15 on the front plate 1.

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  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Abstract

The present invention refers to a contact insert (6), which can be inserted in a connector housing, having an earth connection to the housing body. Such contact inserts are used in so-called filter connectors in which a filter disc is intended to be connected to the housing earth of an equipment. In conventional contact inserts, the earth connection to the housing is produced indirectly via a housing of the filter connector, it being impossible to avoid an increased contact resistance in unfavourable circumstances. In order to reduce the contact resistance between the contact insert and the housing body, without major design cost, a radially sprung-elastic body compression ring (16) is provided radially between the contact insert and the housing, which ring produces the earth connection between the contact insert and the housing. <IMAGE>

Description

Die vorliegende Erfindung betrifft gemäß den Merkmalen des oberbegriffs des Anspruchs 1 allgemein einen in ein Gehäuse einsetzbaren Kontakteinsatz mit Maseanschluß an das Gehäuse. Die Erfindung betrifft insbesondere gemäß den Merkmalen des Oberegriffs des Anspruchs 2 eine an einem Gerätegehäuse anbringbare Kontaktanordnung mit einem dosenförmigen Gehäuse und einem darin eingesetzten auswechselbaren Kontakteinsatz, der über einen Masseanschluß mit dem Gerätegehäuse verbunden ist.According to the features of the preamble of claim 1, the present invention relates generally to a contact insert which can be inserted into a housing and has a mask connection to the housing. The invention relates in particular to a contact arrangement which can be attached to a device housing and has a box-shaped housing and an exchangeable contact insert inserted therein, which is connected to the device housing via a ground connection.

Die Herstellung des Massekontaktes zwischen Kontakteinsätzen und dem zugehörigen Gehäuse, zumeist einem Gerätegehäuse, wird in herkömmlicher Weise dadurch bewerkstelligt, daß der Kontakteinsatz zunächst in ein elektrisch leitendes Gehäuse eingesetzt wird, wobei von dem Kontakteinsatz ein Massekontakt zum Gehäuse hergestellt wird und dann der Masseschluß von dem Gehäuse zu dem Gerätegehäuse über eine Schraubverbindung erfolgt.The manufacture of the ground contact between the contact inserts and the associated housing, usually a device housing, is accomplished in a conventional manner in that the contact insert is first inserted into an electrically conductive housing, a ground contact being made from the contact insert to the housing and then the ground connection from the Housing to the device housing via a screw connection.

Ungünstig ist hierbei, daß der Massekontakt stets über das Gehäuse erfolgt und dadurch die Anzahl der übergangswiderstände verhältnismäßig hoch ist. Zwar könnte durch Anlöten eines Masseanschlusses an das Gehäuse der übergangswiderstand verbessert werden, damit würde jedoch das leichts Auswechseln des Kontakteinsatzes verhindert werden.It is disadvantageous here that the ground contact always takes place via the housing and the number of contact resistances is therefore relatively high. The contact resistance could be improved by soldering a ground connection to the housing, but this would prevent the contact insert from being easily replaced.

Es ist daher Aufgabe der vorliegenden Erfindung, den Masseschluß zwischen den eingangs genannten Kontakteinsätzen und den zugehörigen Gehäusen zu verbessern, ohne daß die leichte Auswechselbarkeit der Kontakteinsätze hierdurch beeinträchtigt wird.It is therefore an object of the present invention, the short to ground between the aforementioned To improve contact inserts and the associated housings without impairing the easy interchangeability of the contact inserts.

Entsprechend den kennzeichnenden Merkmalen des Anspruches 1 wird dieser Aufgabe dadurch gelöst, daß in radialer Richtung zwischen dem Kontakteinsatz und dem Gehäuse ein radial federlastischer Massefederring angeordnet ist, der den Masseschluß zwischen dem Kontakteinsatz und dem Gehäuse herstellt.According to the characterizing features of claim 1, this object is achieved in that a radially spring-loaded spring washer is arranged in the radial direction between the contact insert and the housing, which produces the ground connection between the contact insert and the housing.

Auf diese Weise bleibt zunächst die leichte Auswechselbarkeit des Kontakteinsatzes erhalten. Darüber hinaus wird aber auch die Masseverbindung verbessert, da diese unter Ausschluß eines etwaigen Gehäuses direkt erfolgt. Weiterhin wird durch die Elastizität des Massefederrings stets eine gewisse Vorspannung auf die miteinander zu verbindenden Kontaktflächen ausgeübt, wodurch ein besonders niedriger übergangswiderstand gewährleistet ist. Diesen übergangswiderstand besonders niedrig zu halten ist insbesondere für Kontakteinsätze sogenannter Filterstecker nötig, da bereits ungleichmäßig verteiltel übergangswiderstände die Filterwirkung nachteilig beeinflussen können.In this way, the easy interchangeability of the contact insert is retained. In addition, however, the ground connection is also improved, since this takes place directly with the exclusion of any housing. Furthermore, due to the elasticity of the mass spring ring, a certain pre-tension is always exerted on the contact surfaces to be connected to one another, which ensures a particularly low contact resistance. Keeping this contact resistance particularly low is particularly necessary for contact inserts of so-called filter plugs, since unevenly distributed contact resistances can adversely affect the filter effect.

Gemäß den kennzeichenden Merkmalen des Anspruches 2 wird die erfindungsgemäße Aufgabe für eine an einem Kontaktgehäuse anbringbare Kontaktanordnung dadurch gelöst, daß der Masseanschluß des Kontakteinsatzes zweiteilig ausgebildet ist und eine radial bis etwa an den Rand des Gehäuses heranreichende Kontaktfläche aufweist und dasß in einen Radialspalt zwischen dem Buchengehäuse und em Gerätegehäuse ein radial federlastischer Massefederring eingesetzt ist, der sich an der Kontakfläche und an dem Gerätegehäuse abstützt. Auch bei einer solchen Kontaktanordnung werden die oben genannten Vorteile erreicht. Hinzu kommt, daß die Masseverbindung unabhängig davon ist, wie das dosenförmige Gehäuse an das Gerätegehäuse angebracht ist. Es wäre z.B. denkbar, daß das Gehäuse aus einem isolierenden Kunststoff hergestellt ist, was die Masseverbindung zwischen dem Kontakteinsatz und dem Gerätegehäuse in keiner Weise beeinträchtigen würde. Da der federlastische Massefederring in einen Spalt zwischen dem Gehäuse und dem Gerätegehäuse eingesetzt ist, ist auch das Auswechseln des Kontakteinsatzes unproblematisch. Der Massefederring kann z.B. vor dem Einsetzen des Kontakteinsatzes bereits in den Radialspalt eingeschoben sein.According to the characterizing features of claim 2, the object according to the invention for a contact arrangement which can be attached to a contact housing is achieved in that the ground connection of the contact insert is formed in two parts and has a contact surface which extends radially up to approximately the edge of the housing and that into a radial gap between the beech housing and em device housing, a radially spring-loaded mass spring ring is used, which is supported on the contact surface and on the device housing. Even with one Contact arrangement the advantages mentioned above are achieved. In addition, the ground connection is independent of how the can-shaped housing is attached to the device housing. It would be conceivable, for example, that the housing be made of an insulating plastic, which would in no way impair the ground connection between the contact insert and the device housing. Since the spring-loaded mass spring washer is inserted into a gap between the housing and the device housing, the replacement of the contact insert is also unproblematic. The mass spring ring can, for example, already be inserted into the radial gap before the contact insert is inserted.

Gemäß einer bevorzugten Ausführungsform nach Anspruch 3 ist der Radialspalt zwischen dem Gehäuse und dem Gerätegehäuse entgegen der Einsteckrichtung des Kontakteinsatzes axial offen ausgebildet. Hierdurch ist es in vorteilhafter Weise möglichm daß beim Auswechseln des Massefederrings und des Kontakteinsatzes der Massefederring von derselben Seite her eingeschoben werden kann wie auch der Kontakteinsatz.According to a preferred embodiment according to claim 3, the radial gap between the housing and the device housing is axially open against the direction of insertion of the contact insert. As a result, it is advantageously possible that when replacing the mass spring ring and the contact insert, the mass spring ring can be inserted from the same side as the contact insert.

Eine bevorzugte Ausgestaltung der Erfindung gemäß den Merkmalen des Anspruchs 4 sieht vor, daß der Massefederring einen etwa rohrförmigen Kontaktkragen aufweist, der im eingebauten Zustand des Massefederrings radial an der Kontaktfläche des Kontakteinsatzes anliegt. Das hat den Vorteil, daß unabhängig von der Winkellage des einzusetzenden Massefederrings stets ein Kontakt zur Kontaktfläche des Kontakteinsatzes hergestellt wird. Ggf. kann die Kontaktfläche des Kontakteinsatzes auch als Filterscheibe ausgebildet sein, die so weit über das Gehäuse hinaussteht, daß sie in den Kontaktkragen des Maasefederrings eingreift. Auf diese Weise wird eine besonders große Kontaktfläche zwischen dem Kontaktkragen und dem Kontakteinsatz hergestellt, was den übergangswiderstand weiter verringert.A preferred embodiment of the invention according to the features of claim 4 provides that the mass spring ring has an approximately tubular contact collar which bears radially against the contact surface of the contact insert in the installed state of the mass spring ring. This has the advantage that regardless of the angular position of the mass spring ring to be used, contact is always made with the contact surface of the contact insert. Possibly. the contact surface of the contact insert can also be designed as a filter disk which projects so far beyond the housing that it is in the contact collar of the Meuse feather ring engages. In this way, a particularly large contact area between the contact collar and the contact insert is produced, which further reduces the contact resistance.

Die Federwirkung des Massefederrings wird gemäß den Merkmalen des Anspruchs 5 einfacher Weise dadurch erreicht, daß der Massefederring im Anschluß an den Kontaktkragen einen etwa tonnenförmig radial nach außen gewölbten, im eingebauten Zustand sich an dem Gerätegehäuse abstützenden Federkörper aufweist. Hierdurch wird auch in einfacher Weise erreicht, daß der Massefederring, wenn er vor dem Kontakteinsatz eingeschcoben wird, sich radial am Gerätegehäuse abstützt und so bereits in seiner Lage fixiert ist.The spring action of the mass spring ring is achieved in a simple manner according to the features of claim 5 in that the mass spring ring in connection with the contact collar has an approximately barrel-shaped radially outward, in the installed state supported on the device housing spring body. In this way it is also achieved in a simple manner that the mass spring ring, when it is pushed in before the contact insert, is supported radially on the device housing and is thus already fixed in its position.

Die Federwirkung des FederkÖrpers läßt sich entsprechend der Merkmale des Anspruchs 6 weiterhin dadurch erhöhen, daß der tonnenförmige Federkörper mit axial ausgerichteten, von Federstegen seitlich begrenzten Längsschlitzen versehen ist. Diese Längsschlitze haben den weiteren Vorteil, daß sie die Anpreßfläche des tonnenförmigen Federkörpers an das Gerätegehäuse verringern, so daß die radial nach außen wirkenden Druckkräfte auf des Gerätegehäuse zunehmen. Das bewirkt, daß beim Einschieben des Massefederrings bereits Oxidschichten am Gerätegehäuse abgeschabt werden, wodurch der übergagnswiderstand zwischen dem Massefederring und dem Gerätegehäuse weiter verringert wird.The spring action of the spring body can be further increased in accordance with the features of claim 6 in that the barrel-shaped spring body is provided with axially aligned longitudinal slots laterally delimited by spring bars. These longitudinal slots have the further advantage that they reduce the pressure surface of the barrel-shaped spring body on the device housing, so that the radially outward pressure forces on the device housing increase. The result of this is that when the mass spring ring is inserted, oxide layers are already scraped off on the device housing, as a result of which the transmission resistance between the mass spring ring and the device housing is further reduced.

Eine Ausgestaltung der Erfindung gemäß den Merkmalen des Anspruchs 7 sieht vor, daß die Längsschlitze vor dem Kontaktkragen enden. Hierdurch wird erreicht, daß der Kontaktkragen eine geschlossene Kontaktfläche aufweist.An embodiment of the invention according to the features of claim 7 provides that the longitudinal slots end in front of the contact collar. This ensures that the contact collar has a closed contact surface.

Die Federwirkung des Federrings wird gemäß den Merkmalen des Anspruchs 8 dadurch vergleichmäßigt, daß die Längsschlitze etwa die gleiche Breite aufweisen wie die benachbarten Federstege. Es können über den Umfang verteilt eine Vielzahl von Längsschlitzen vorgesehen sein, wodurch das Abschaben etwaiger Oxidschichten in dem Gerätegehäuse beim Einsetzen des Massefederrings weiter begüngstigt wird.The spring action of the spring ring is evened out according to the features of claim 8 in that the longitudinal slots have approximately the same width as the adjacent spring bars. A large number of longitudinal slots can be provided distributed over the circumference, as a result of which the scraping off of any oxide layers in the device housing is further favored when the mass spring ring is inserted.

Gemäß den Merkmalen des Anspruch 9 ist in vorteilhafter Weise vorgesehen, daß die Längsschlitze mit Abstand vor dem freien Ende des tonnenförmigen Federkörpers enden. Bedenkt man, daß der Massefederring mit dem freien Ende des Federkörpers zuerst in den Radialspalt zwischen dem Gehäuse und dem Gerätegehäuse eingeschoben wird, so ergibt sich insbesondere bei seht schmalen Federstegen der Vorteil, daß diese nicht verbogen werden können.According to the features of claim 9, it is advantageously provided that the longitudinal slots end at a distance from the free end of the barrel-shaped spring body. If you consider that the mass spring ring with the free end of the spring body is first inserted into the radial gap between the housing and the device housing, there is the advantage in particular with very narrow spring bars that they cannot be bent.

Entsprechend einer bevorzugten Ausführungsform gemäß Anspruch 10 beträgt die Länge der Längsschlitze etwa 5/6 der Länge des tonnenförmigen Federkörpers.According to a preferred embodiment according to claim 10, the length of the longitudinal slots is approximately 5/6 of the length of the barrel-shaped spring body.

Eine sich in den Merkmalen des Anspruchs 11 niederschlagende bevorzugte Ausführungsform sieht vor, daß der Innendurchmesser des Kontaktkragens kleiner ist als der Innendurchmesser des freien Endes des tonnenförmigen Fedeekörpers. Hierdurch läßt sich der Massefederring auch dann in einfacher Weise einschieben, wenn der Kontakteinsatz bereits in das Gehäuse eingeschoben ist. Das freie Ende paßt mit Spiel über die Filterscheibe oder die Kontaktfläche des Masseanschlusses des Kontakteinsatzes herüber. Die Innenseite des tonnenförmigen Federkörpers wirkt als Einführschräge und bewirkt so ein Zentrierung des Kontaktkragens auf der Filterscheibe des Kontakteinsatzes.A preferred embodiment which is reflected in the features of claim 11 provides that the inner diameter of the contact collar is smaller than the inner diameter of the free end of the barrel-shaped spring body. As a result, the mass spring ring can be inserted in a simple manner even when the contact insert is already inserted into the housing. The free end fits with play over the filter disk or the contact surface of the ground connection of the contact insert. The inside of the barrel-shaped spring body acts as a lead-in chamfer and thus causes the contact collar to be centered on the filter disk of the contact insert.

Besonders einfach herstellen Läßt sich der elastische Massefederring gemäß Anspruch 12 dadurch, daß der tonnenförmige Federkörper und der rohrförmige Kontaktkragen einstückig aus einem Rohrstück hergestellt sind.The elastic mass spring ring according to claim 12 can be produced in a particularly simple manner in that the barrel-shaped spring body and the tubular contact collar are made in one piece from a piece of pipe.

Ein Ausführungsbeispiel der Erfindung wird anhand einer Zeichnung näher erläutert.An embodiment of the invention is explained in more detail with reference to a drawing.

Die einzige Figur zeigt in perspektivischer, teilweise geschnittener Darstellung eine in die Frontplatte 1 eines Gerätegehäuses eingebaute Kontaktanordnung 2.The single figure shows a perspective, partially sectioned representation of a contact arrangement 2 built into the front plate 1 of a device housing.

Die Kontaktanordnung 2 umfaßt einen dosenförmiges Gehäuse 3, welches von der Außenseite der Frontplatte her an diese angeschraubt ist. Die Frontplatte 1 ist mit einem kreisrunden Durchbruch 4 versehen, in den das dosenförmige Gehäuse 3 hineinragt. Der Außendurchmesser des in den Durchbruch 4 hineinragenden Gehäuses 3 ist kleiner als der Innendurchmesser des Durchbruches 4, so daß zwischen Gehäuse 3 und Durchbruch 4 ein Ringspalt 5 verbleibt.The contact arrangement 2 comprises a box-shaped housing 3 which is screwed onto the front plate from the outside thereof. The front plate 1 is provided with a circular opening 4, into which the can-shaped housing 3 projects. The outside diameter of the housing 3 projecting into the opening 4 is smaller than the inside diameter of the opening 4, so that an annular gap 5 remains between the housing 3 and the opening 4.

In das Gehäuse 3 der Kontaktanordnung 2 ist ein Kontakteinsatz 6 von der Geräteinnenseite, also von der rechten Seite her eingesteckt. Der Kontakteinsatz 6 weist einen radialelastischen Rastring 7 auf, welcher einen Vorsprung auf der Innenseite des Gehäuses 3 hintergreift.A contact insert 6 is inserted into the housing 3 of the contact arrangement 2 from the inside of the device, that is to say from the right side. The contact insert 6 has a radially elastic locking ring 7, which engages behind a projection on the inside of the housing 3.

An dem zur Gehäuseinnenseite weisenden Stirnende des Kontakteinsatzes 6 ragen von Röhrchenkondensatoren 9 umgebende Lötstifte 10 heraus. An den Lötstiften 10 ist eine Leiterplatte 11 angeschlossen.At the front end of the contact insert 6 pointing towards the inside of the housing, solder pins 10 surrounding tube capacitors 9 protrude. A circuit board 11 is connected to the solder pins 10.

Die Röhechenkondensatoren 9 weisen unmittelbar bevor sie aus dem Kontakteinsatz 6, welcher im wesentlichen aus isolierendem Kunststoffmaterial besteht, herausragen, eine Kondensatoranschlußplatte 12 auf.The tube capacitors 9 have a capacitor connecting plate 12 immediately before they protrude from the contact insert 6, which essentially consists of insulating plastic material.

Auf der die Lötstifte 10 bzw. die Röhrchenkondensatoren 9 aufweisenden Stirnseite des Kontakteinsatzes 6 ist eine Massescheibe 13 aus Kupferknetlegierung aufgebracht, die Durchstecköffnungen 14 für die Röhrchenkondensatoren 9 besitzt¸ an welchen die Kondensatoranschlußplatten 12 mit der Massescheibe 13 verlötet sind.On the end face of the contact insert 6 which has the solder pins 10 or the tube capacitors 9, a ground disk 13 made of wrought copper alloy is applied, which has through openings 14 for the tube capacitors 9 to which the capacitor connecting plates 12 are soldered to the ground disk 13.

Die Lötstifte 12 führen durch den Kontakteinsatz 6 axial hindurch und sidn an dem gegenüberliegenden Stirnende des Kontakteinsatzes 6 als Steckerbuchsen 15 ausgebildet.The solder pins 12 lead axially through the contact insert 6 and are designed as plug sockets 15 on the opposite end of the contact insert 6.

Das rechte stirnseitige Ende des Kontakteinsatzes 6 und des Gehäuses 3 ragen in das Gehäuseinnere über den Durchbruch 4 der Frontplatte 1 hinaus und fluchten miteinander. Die auf dem Ende des Kontakteinsatzes 6 befestigte Massescheibe 13 ragt bei dem hier gezeigten Ausführungsbeispiel radial geringfügig über den Außenrand des Gehäuses 3 hinaus.The right end of the contact insert 6 and the housing 3 protrude into the housing interior through the opening 4 of the front panel 1 and are aligned with each other. The ground disk 13 attached to the end of the contact insert 6 projects radially slightly beyond the outer edge of the housing 3 in the exemplary embodiment shown here.

In den Ringspalt 5 zwischen dem Gehäuse 3 und dem Durchbruch 4 der Frontplatte 1 des Gehäuse ist ein Massefederring 16 eingesetzt.A mass spring ring 16 is inserted into the annular gap 5 between the housing 3 and the opening 4 of the front plate 1 of the housing.

Der Massefederring 16 ist radial elastisch ausgebildet und stützt sich einerseits an dem Durchbruch 4 der Frontplatte 1 ab und andererseits an dem Außenumfang der Massescheibe 13.The mass spring ring 16 is designed to be radially elastic and is supported on the one hand on the opening 4 of the front plate 1 and on the other hand on the outer circumference of the mass disk 13.

Aus der Zeichnung ist deutlich ersichtbar, daß der Radialspalt 5 entgegen der Einstecktrichtung des Kontakteinsatzes 6, also nach rechts hin axial offen ausgebildet ist.From the drawing it can clearly be seen that the radial gap 5 is axially open against the direction of insertion of the contact insert 6, that is to the right.

Es ist ebenfalls gut erkennbar, daß der Massefederring 16 einen etwa rohrförmigen Kontaktkragen 17 aufweist, der in dem in der Zeichnung dargestellten, eingebauten Zustand radial an dem Außenumfang der Massenscheibe 13 des Kontakteinsatzes 6 anliegt.It can also be clearly seen that the mass spring ring 16 has an approximately tubular contact collar 17 which, in the installed state shown in the drawing, bears radially against the outer circumference of the mass disk 13 of the contact insert 6.

An den Kontaktkragen 17 schließt sich in axialer Richtung ein toñenförmig radial nach außen gewölbter Federkörper 18 an. Der Federkörper 18 stützt sich im eingebauten Zustand des Massefederrings 16 an der den Durchbruch 4 begrenzenden Frontplatte 1 ab.The contact collar 17 is adjoined in the axial direction by a spring body 18 curved radially outwards. The spring body 18 is supported in the installed state of the mass spring ring 16 on the front plate 1 delimiting the opening 4.

Wie aus der Hälfte der Zeichnung deutlich ersichtlich ist, ist der tonnenförmige Federkörper 18 mit axial ausgerichteten, von Federstegen 19 seitlich begrenzten Längsschlitzen 20 versehen.As can be clearly seen from half of the drawing, the barrel-shaped spring body 18 is provided with axially aligned longitudinal slots 20 which are laterally delimited by spring bars 19.

Die Längsschlitze 20 enden einerseits vor dem Kontaktkragen 17 und andererseits mit Abstand vor dem freien Ende des toñenförmigen Federkörpers 18.The longitudinal slots 20 end on the one hand in front of the contact collar 17 and on the other hand at a distance from the free end of the barrel-shaped spring body 18.

Die Länge der Längsschlitze beträgt etwa 5/6 der Länge des tonnenförmigen Federkörpers 18. Die Breite der Längsschlitze ist etwa genauso groß wie die Breite der benachbarten Federstege 19.The length of the longitudinal slots is approximately 5/6 of the length of the barrel-shaped spring body 18. The width of the longitudinal slots is approximately the same as the width of the adjacent spring bars 19.

Auf diese ergibt sich ein Massefederring 16, der an beiden axialen Enden geschlossen ist. Bei dem hier dargestellten Ausführungsbeispiel ist der Innendurchmesser des Kontaktkragens 17 praktisch genauso groß wie der Innendurchmesser des freien Endes 21 des Federkörpers 18. Wenn die Massescheibe 13 nicht so weit radial nach außen ragt, kann der Innendurchmesser des Kontaktkragens 17 entsprechend kleiner als der des freien Endes 21 des Federkörpers ausgebildet sein.This results in a mass spring ring 16, which is closed at both axial ends. In the embodiment shown here, the inner diameter of the contact collar 17 is practically the same large as the inner diameter of the free end 21 of the spring body 18. If the mass disk 13 does not protrude so far radially outwards, the inner diameter of the contact collar 17 can be made correspondingly smaller than that of the free end 21 of the spring body.

Die Herstellung des Massefederrings 16 läßt sich in einfacher Weise aus einem Rohrstück bewerkstelligen, wobei Kontaktkragen 17 und tonnenförmiger Federkörper 18 einstückig miteinander verbunden bleiben.The manufacture of the mass spring ring 16 can be accomplished in a simple manner from a piece of pipe, the contact collar 17 and barrel-shaped spring body 18 remaining integral with one another.

Obwohl bei dem hier dargestellten Ausführungsbeispiel der Massefederring an seinen beiden Enden, d.h. am Kontaktkragen und an dem freien Ende 21 des Federkörpers geschlossen ausgebildet ist, kann auch ein Längsschlitz durchgehend ausgebildet sein, um so auch eine Federwirkung des Kontaktkragens 17 zu erreichen. Die Federwirkung des Kontaktkragens 17 könnte auch dadurch erreicht werden¸      daß sich die Längsschlitze bis in den Kontaktkragen hinein erstrecken und eine Wölbung radial nach innen aufweisen.Although in the embodiment shown here the mass spring ring at both ends, i.e. is formed closed on the contact collar and on the free end 21 of the spring body, a longitudinal slot can also be formed continuously, so as to achieve a spring effect of the contact collar 17. The spring action of the contact collar 17 could also be achieved by the fact that the longitudinal slots extend into the contact collar and have a curvature radially inwards.

Im folgenden wird die Wirkungsweise des Massefederrings 16 anhand des Ein- und Ausbaus des Kontak 16 beschrieben.The mode of operation of the mass spring ring 16 is described below on the basis of the installation and removal of the contact 16.

Bei der Beschreibung wird davon ausgegangen, daß sich zunächst der Kontakteinsatz 6 und der Massefederring 16 im ausgebauten Zustand befinden.In the description it is assumed that the contact insert 6 and the mass spring ring 16 are in the disassembled state.

Zunächst wird der Massefederring 16 mit seinem tonnenförmigen Federkörper 18 voran der rechten Seite nach links in den Ringspalt 6 eingeschoben. Hierbei werden die Federstege 19 federlastisch leicht radial nach innen zusammengedrückt, wodurch der Massefederring 16 seinen Halt in dem Durchbruch 4 erhält und wodurch andererseits eine sich an dem Durchbruch 4 evtl. gebildet Oxidschicht abgeschabt wird. Der Massefederring 16 wird so weit geschoben, bis er etwa am Flansch des Gehäuses 3 anstößt.First of all, the mass spring ring 16 with its barrel-shaped spring body 18 is inserted in the annular gap 6 to the left on the right side. Here, the spring bars 19 are slightly radially compressed radially inward, whereby the mass spring ring 16 receives its hold in the opening 4 and on the other hand an oxide layer possibly formed on the opening 4 is scraped off. The mass spring ring 16 is pushed until it abuts the flange of the housing 3.

Sodann wird der Kontakteinsatz 6 ebenfalls von der rechten Seite her nach links in das dosenförmige Gehäuse 3 eingeschoben. Hierbei gleitet die Massenscheibe 13 in den Kontaktkragen 17 hinein und liegt mit ihrem Außenumfang an dem Kontaktkragen 17 kontaktbildend an. Bei dem hier dargestellten Ausführungsbeispiel weist die Massescheibe 13 an ihrem Außenumfang federnde Zungen 22 auf, die federnd gegen den Kontaktkragen 17 drücken. Sollte die Massescheibe 13 nicht mit solchen Zungen ausgebildet sein, so kann dem Kontaktkragen 17 dadurch eine Federwirkung beigebracht werden, daß einer der Längsschlitze an einer Stelle des Umfang des Massefederrings durchgängig ausgebildet ist.Then the contact insert 6 is also inserted from the right side to the left into the box-shaped housing 3. Here, the mass disk 13 slides into the contact collar 17 and rests with its outer circumference on the contact collar 17 in a contact-forming manner. In the exemplary embodiment shown here, the mass disk 13 has on its outer circumference resilient tongues 22 which press resiliently against the contact collar 17. If the mass disk 13 is not designed with such tongues, the contact collar 17 can be provided with a spring effect in that one of the longitudinal slots is formed continuously at one point on the circumference of the mass spring ring.

Vorzugsweise wird der auf das Gehäuse 3 vormontierter Massefederring 16 zusammen mit dem Gehäuse 3 in den Ringspalt l5 an der Frontplatte 1 eingebaut.The mass spring ring 16 pre-assembled on the housing 3 is preferably installed together with the housing 3 in the annular gap 15 on the front plate 1.

Es ist auch möglich, den Außenumfang der Massescheibe 13 mit dem Kontaktkragen 17, z.B. an den umgebogenen Zungen 22 zu verlöten. Der Massefederring 16 kann dann gleichzeitig mit dem Kontakteinsatz 6 in den Ringspalt 5 eingeschoben werden.It is also possible to connect the outer circumference of the mass disk 13 to the contact collar 17, e.g. to be soldered to the bent tongues 22. The mass spring ring 16 can then be inserted into the annular gap 5 simultaneously with the contact insert 6.

Claims (13)

In ein Gehäuse einsetzbarer Kontakteinsatz mit Masseanschluß an das, Gehäuse,
dadurch gekennzeichnet,
daß in radialer Richtung zwischen dem Kontakteinsatz (6) und dem Gehäuse (1) ein radial federelastischer Massefederring (16) angeordnet ist, der den Masseschluß zwischen dem Kontakteinsatz ( 6) und dem Gehäuse (1) herstellt.Contact insert which can be inserted into a housing and has a ground connection to the housing
characterized,
that in the radial direction between the contact insert (6) and the housing (1) a radially resilient mass spring ring (16) is arranged, which produces the short circuit between the contact insert (6) and the housing (1). 2. An einem Gerätegehäuse anbringbare Kontaktanordnung mit einem dosenförmigen Gehäuse und einem darin eingesetzten auswechselbaren Kontakteinsatz, der über einen Masseanschluß mit dem Gerätegehäüuse verbunden ist,
dadurch gekennzeichnet,
daß der Masseanschluß des Kontakteinsatzes (6) zweiteilig ausgebildet ist und eine radial bis etwa an den Rand des Gehäuses (3) heranreichende Kontaktfläche (13) aufweist und daß in einen Radialspalt (5) zwischen dem Gehäuse (3) und dem Gerätegehäuse (1) ein radial federlastischer Massefederring (16) eingesetzt ist, der sich an der Kontaktfläche (13) und dem Gerätegehäuse (1) abstützt.2. Attachable to a device housing contact arrangement with a box-shaped housing and an interchangeable contact insert inserted therein, which is connected to the device housing via a ground connection,
characterized by
that the ground connection of the contact insert (6) is formed in two parts and has a contact surface (13) reaching radially up to approximately the edge of the housing (3) and that in a radial gap (5) between the housing (3) and the device housing (1) a radially spring-loaded mass spring ring (16) is used, which is supported on the contact surface (13) and the device housing (1). 3. Kontaktanordnung nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß der Radialspalt (5) zwischen dem Gehäuse (3) und dem Gerätegehäuse (1) entgegen der Einsteckrichtung des Kontakteinsatzes (6) axial offen ausgebildet ist.3. Contact arrangement according to claim 1 or 2,
characterized by
that the radial gap (5) between the housing (3) and the device housing (1) against the insertion direction of the contact insert (6) is axially open. 4. Kontaktanordnung nach mindestens einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
daß der Massefederring (16) einen etwa röhrförmigen Kontaktkragen (17) aufweist, der im eingebauten Zustand des Massefederrings (16) radial an der Kontaktfläche (13) des Kontakteinsatzes (6) anliegt.4. Contact arrangement according to at least one of claims 1 to 3,
characterized by
that the mass spring ring (16) has an approximately tubular contact collar (17) which, in the installed state of the mass spring ring (16), rests radially on the contact surface (13) of the contact insert (6). 5. Kontaktanordnung nach mindestens einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß der Massefederring (16) im Anschluß an den Kontaktkragen (17) einen etwa tonnenförmig radial nach außen gewölbten, im eingebauten Zustand sich an dem Gerätegehäuse (1) abstützenden Federkörper (18) aufweist.5. Contact arrangement according to at least one of claims 1 to 4,
characterized by
that the mass spring ring (16) in connection with the contact collar (17) has an approximately barrel-shaped, radially outwardly curved, in the installed state, which rests on the device housing (1) and supports the spring body (18). 6. Kontaktanordnung nach mindestens einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß der tonnenförmige Federkörper (18) mit axial ausgerichteten, von Federstegen (19) seitlich begrenzten Längsschlitzen (20) versehen ist.6. Contact arrangement according to at least one of claims 1 to 5,
characterized by
that the barrel-shaped spring body (18) is provided with axially aligned longitudinal slots (20) delimited laterally by spring bars (19). 7. Kontaktanordnung mindestens nach Anspruch 6,
dadurch gekennzeichnet,
daß die Längesschlitze (20) vor dem Kontaktkragen (17) enden.7. Contact arrangement at least according to claim 6,
characterized by
that the longitudinal slots (20) end in front of the contact collar (17). 8. Kontaktanordnung mindestens nach Anspruch 6 oder 7,
dadurch gekennzeichnet,
daß die Längsschlitze (20) etwa die gleiche Breite aufweisen wie die benachbarten Federstege (19).8. Contact arrangement at least according to claim 6 or 7,
characterized by
that the longitudinal slots (20) have approximately the same width as the adjacent spring bars (19). 9. Kontaktanordnung nach mindestens einem der Ansprüche 6 bis 8,
dadurch gekennzeichnet,
daß die Längsschlitze (20) mit Abstand vor dem freien Ende (21) des tonnenförmigen Federkörpers (18) enden.9. Contact arrangement according to at least one of claims 6 to 8,
characterized by
that the longitudinal slots (20) end at a distance from the free end (21) of the barrel-shaped spring body (18). 10. Kontaktanordnung nach mindestens einem der Ansprüche 6 bis 9,
dadurch gekennzeichnet,
daß die Länge der Längsschlitze (20) etwa 5/6 der Länge des tonnenförmigen Federkörpers (18) beträgt10. Contact arrangement according to at least one of claims 6 to 9,
characterized by
that the length of the longitudinal slots (20) is about 5/6 the length of the barrel-shaped spring body (18) 11. Kontaktanordnung nach mindestens einem der Ansprüche 1 bis 10,
dadurch gekennzeichnet,
daß der Innendurchmesser des Kontaktkragens (17) kleiner ist als der Innendurchmesser des freien Endes (21) des tonnenförmigen Federkörpers (18).11. Contact arrangement according to at least one of claims 1 to 10,
characterized by
that the inner diameter of the contact collar (17) is smaller than the inner diameter of the free end (21) of the barrel-shaped spring body (18). 12. Kontaktanordnung nach mindestens einem der Ansprüche 1 bis 11,
dadurch gekennzeichnet,
daß der tonnenförmige Federkörper (18) und der rohrförmige Kontaktkragen (17) einstückig aus einem Rohrstück hergestellt sind.12. Contact arrangement according to at least one of claims 1 to 11,
characterized by
that the barrel-shaped spring body (18) and the tubular contact collar (17) are made in one piece from a piece of pipe. 13. Kontaktanordnung nach mindestens einem der ansprüche 1 bis 12,
dadurch gekennzeichnet,
daß der Massefederring (16) unverlierbar auf dem Gehäuse (3) gefügt ist.13. Contact arrangement according to at least one of claims 1 to 12,
characterized by
that the mass spring ring (16) is captively attached to the housing (3).
EP87115616A 1987-01-09 1987-10-23 Housing insertable contact set Expired - Lifetime EP0278057B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873700514 DE3700514A1 (en) 1987-01-09 1987-01-09 INSERTABLE CONTACT INSERT
DE3700514 1987-01-09

Publications (2)

Publication Number Publication Date
EP0278057A1 true EP0278057A1 (en) 1988-08-17
EP0278057B1 EP0278057B1 (en) 1992-04-22

Family

ID=6318621

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87115616A Expired - Lifetime EP0278057B1 (en) 1987-01-09 1987-10-23 Housing insertable contact set

Country Status (2)

Country Link
EP (1) EP0278057B1 (en)
DE (2) DE3700514A1 (en)

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Also Published As

Publication number Publication date
EP0278057B1 (en) 1992-04-22
DE3778528D1 (en) 1992-05-27
DE3700514A1 (en) 1988-07-21

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