EP0197249B1 - Bayonet-like coupling for connecting two hollow tubular parts - Google Patents

Bayonet-like coupling for connecting two hollow tubular parts Download PDF

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Publication number
EP0197249B1
EP0197249B1 EP86101131A EP86101131A EP0197249B1 EP 0197249 B1 EP0197249 B1 EP 0197249B1 EP 86101131 A EP86101131 A EP 86101131A EP 86101131 A EP86101131 A EP 86101131A EP 0197249 B1 EP0197249 B1 EP 0197249B1
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EP
European Patent Office
Prior art keywords
shoulder
parts
connecting ring
cams
ring
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Expired
Application number
EP86101131A
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German (de)
French (fr)
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EP0197249A1 (en
Inventor
Dieter Jühling
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Sulzer AG
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Gebrueder Sulzer AG
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Publication of EP0197249A1 publication Critical patent/EP0197249A1/en
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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
    • H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
    • H01R13/625—Casing or ring with bayonet engagement

Definitions

  • the invention relates to a bayonet-type coupling, in particular for an electrical connector, a first hollow-cylindrical part being connected coaxially in a pressure-tight manner to a second hollow-cylindrical part, and in this connected state the first part having an axial extension is inserted into a correspondingly shaped axial recess in the second part and an annular seal is provided between two mutually opposing end faces of the two parts, and furthermore one of the two parts is provided with a shoulder and with an axially displaceable and rotatable connecting ring which overlaps the latter and has radially projecting cams on its inner surface which are used for the purpose of connecting of the two parts cooperate with suitably shaped and arranged projections of the other part.
  • Couplings of this type are used in various fields of technology and have the advantage that a tight connection of the two hollow cylindrical parts can be quickly established and also quickly released again.
  • This property is important, for example, when connecting power and control cables to pressure-carrying valves and their drives, because such cables often have to be loosened and tightly connected during overhaul and inspection work.
  • the elastic ring seal is loaded unevenly on the circumference. This can lead to premature wear of the ring seal, so that - in the interest of safety - frequent seal changes are necessary, which increase the maintenance and operating costs.
  • the handling of the coupling according to the invention requires approximately the same amount of time as that of the conventional coupling, in which the connecting ring has to be rotated with greater effort.
  • the coupling designated as a whole by 1 has a first hollow cylindrical part 2 and a second hollow cylindrical part 3, which are arranged coaxially to one another.
  • the first part 2 is inserted with a shoulder 2 'in a corresponding recess 3' of the second part 3, an elastic ring seal 4 in the form of an O-ring being arranged between two opposing end faces 5 'and 6 of parts 2 and 3.
  • the O-ring 4, which surrounds the extension 2 ', lies in an annular groove which is located at the transition from the extension 2' to a flange-like shoulder 5 of the first part 2.
  • a connecting ring 7 surrounds the shoulder 5 of the first part 2 and the region of the second part 3 adjacent to the shoulder.
  • the connecting ring 7 has at its end facing the part 3 three radially inwardly directed cams 12 in the form of riveted pins, each in engage one of three grooves 13 which run helically in the outer circumference of the second part 3, namely in the manner of a right-hand thread.
  • the grooves 13 are open at the end face 6 and closed at the other end. They extend approximately over a third of the circumference of part 3.
  • the closed end of the grooves 13 runs - in contrast to the rest of the course - a short distance at right angles to the coupling axis, so that the pins 12 assume a locking position at the closed end of the grooves.
  • a screw ring 8 is provided above the shoulder 5 between the first part 2 and the connecting ring 7 and is screwed with its external thread into an internal thread of the connecting ring 7.
  • the lower surface of the screw ring 8 in the drawing is supported by an annular, formed from a corrugated elastic sheet metal spring 9 and a washer 10 on a shoulder surface 11, which is the surface of the shoulder 5 facing away from the second part 3.
  • the screw ring 8 here forms the clamping means acting between the connecting ring 7 and the first part 2.
  • both rings are provided with knurling 7 'and 8' on the outer circumference.
  • the projection 2 ' has a narrow longitudinal groove 15, to which a rib 16 is suitably provided in the recess 3' in order to prevent the first and second parts 2 and 3 from rotating relative to one another.
  • a cable 17 containing signal lines Arranged within the first part 2 is a cable 17 containing signal lines, which is connected to a connector half 1 T, which is tightly fastened in the interior of the first part 2 and is made of plastic.
  • the connector pins are designated 18.
  • the coupling 1 is connected as follows: the first part 2 is inserted with its shoulder into the recess 3 'of the second part 3, the rib 16 having to be aligned with the longitudinal groove 15, so that incorrect contacts are formed between the two halves 17 'and 19' of the plug is avoided. Thereafter, the connecting ring 7 is pressed slightly against the second part 3 and rotated until the pins 12 engage in the helical grooves 13 and engage at the closed end of the grooves. The screw ring 8 must be set so that in this locking position it presses the spring 9 only slightly against the washer 10, so that the O-ring 4 is loaded only slightly when the connecting ring 7 is turned. So far, the first connection step has been carried out, and there is only a loose connection state.
  • the screw ring 8 is turned by hand until it presses firmly on the spring 9 and further compresses the O-ring 4 via the washer 10 and the shoulder 5.
  • the O-ring is loaded only when rotating the ring 8 in the axial direction and evenly over its circumference. Even in this loaded condition, the spring 9 protects the O-ring 4 against excessive stress caused by non-axial forces that act on the clutch 1.
  • the coupling is now in its fixed connection state. The clutch 1 is released in the reverse order of the steps described above.
  • the wall sections of part 3 which have remained between the grooves 13 form the projections which cooperate with the cams 12.
  • These projections and the cams could, however, also be designed such that when the loose connection is established, they are first only moved axially against one another, moving past one another, and only then is the connecting ring rotated, so that the cams - in the axial direction of the coupling seen - come to lie behind the projections. It is possible that the ring seal is still practically unloaded in this loose connection state. Then, in the second connection step, the ring seal is pressed together using the screw ring.
  • the ring seal 4 can - instead of between the end faces 5 'and 6' - be arranged between the two halves 17 'and 19' of the plug, wherein the diameter of the shoulder 5 can be reduced somewhat.
  • a lever system known from snap locks can be used as the clamping means.
  • the clamping means can also engage between the said ring and the second part.

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  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Description

Die Erfindung betrifft eine bajonettartige Kupplung, insbesondere für einen elektrischen Stecker, wobei ein erster hohlzylindrischer Teil mit einem zweiten hohlzylindrischen Teil druckdicht koaxial verbunden ist und in diesem verbundenen Zustand der erste Teil mit einem axialen Ansatz in eine entsprechend geformte axiale Ausnehmung des zweiten Teils eingesteckt ist und zwischen zwei einander gegenüberstehenden Stirnflächen der beiden Teile eine Ringdichtung vorgesehen ist und wobei ferner der eine der beiden Teile mit einer Schulter und mit einem diese übergreifenden, axial verschiebbaren und drehbaren Verbindungsring versehen ist, der auf seiner Innenfläche radial vorstehende Nocken aufweist, die zwecks Verbindens der beiden Teile mit passend geformten und angeordneten Vorsprüngen des anderen Teils zusammenwirken.The invention relates to a bayonet-type coupling, in particular for an electrical connector, a first hollow-cylindrical part being connected coaxially in a pressure-tight manner to a second hollow-cylindrical part, and in this connected state the first part having an axial extension is inserted into a correspondingly shaped axial recess in the second part and an annular seal is provided between two mutually opposing end faces of the two parts, and furthermore one of the two parts is provided with a shoulder and with an axially displaceable and rotatable connecting ring which overlaps the latter and has radially projecting cams on its inner surface which are used for the purpose of connecting of the two parts cooperate with suitably shaped and arranged projections of the other part.

Kupplungen dieser Art werden auf verschiedenen Gebieten der Technik eingesetzt und haben den Vorteil, dass eine dichte Verbindung der beiden hohlzylindrischen Teile rasch hergestellt und auch rasch wieder gelöst werden kann. Diese Eigenschaft ist zum Beispiel beim Anschluss von Strom- und Steuerkabeln an druckführenden Ventilen und deren Antrieben bedeutungsvoll, weil solche Kabel bei Überholungs- und Kontrollarbeiten oft gelöst und dicht angeschlossen werden müssen. Infolge des unvermeidlichen Spiels zwischen den Kupplungsteilen, das durch Abnützung ständig zunimmt, wird die elastische Ringdichtung am Umfang ungleichmässig belastet. Dies kann eine frühzeitige Abnützung der Ringdichtung zur Folge haben, so dass - im Interesse der Sicherheit - häufige Dichtungswechsel notwendig werden, die die Unterhalts- und Betriebskosten erhöhen.Couplings of this type are used in various fields of technology and have the advantage that a tight connection of the two hollow cylindrical parts can be quickly established and also quickly released again. This property is important, for example, when connecting power and control cables to pressure-carrying valves and their drives, because such cables often have to be loosened and tightly connected during overhaul and inspection work. As a result of the inevitable play between the coupling parts, which increases continuously due to wear, the elastic ring seal is loaded unevenly on the circumference. This can lead to premature wear of the ring seal, so that - in the interest of safety - frequent seal changes are necessary, which increase the maintenance and operating costs.

Es ist daher Aufgabe der Erfindung, bei einer bajonettartigen Kupplung der eingangs genannten Art die Belastung der elastischen Ringdichtung auf einfache und kostengünstige Weise zu vergleichmässigen, um die Häufigkeit der Dichtungswechsel und die damit verbundenen Kosten zu verringern.It is therefore an object of the invention to uniformize the load on the elastic ring seal in a bayonet-type coupling of the type mentioned in a simple and inexpensive manner, in order to reduce the frequency of the seal changes and the associated costs.

Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass zwischen dem Verbindungsring und einem der beiden Teile angreifende Spannmittel vorgesehen sind, die im verbundenen Zustand eine Relativbewegung des die Vorsprünge aufweisenden Teils gegenüber dem die Schulter aufweisenden Teil im Sinne eines Zusammenpressens oder eines weiteren Zusammenpressung der Ringdichtung bewirken. Durch diese Gestaltung der Kupplung wird es möglich, das dichte Verbinden der beiden Teile in zwei Schritten vorzunehmen: Zuerst wird - nachdem die beiden Teile zusammengesteckt sind - durch Drehen des Verbindungsringes eine lockere Verbindung hergestellt, die gegebenenfalls nur eine geringe Beanspruchung der elastischen Ringdichtung verursacht, und erst dann wird mit Hilfe der Spannmittel eine feste, druckdichte Verbindung geschaffen, wobei die Ringdichtung nur noch durch axiale Kräfte gleichmässig belastet wird. Auch das Lösen der Kupplung erfolgt dementsprechend in umgekehrter Reihenfolge in zwei Schritten. Das schrittweise Vorgehen bewirkt eine schonende Beanspruchung der Ringdichtung, da drehende Kräfte an der Dichtung nur auftreten, wenn die Verbindung im lockeren Zustand ist. Durch die Spannmittel, mit denen sich eine relativ grosse Vorspannung der Ringdichtung erreichen lässt, ergeben sich für die Kupplung noch folgende, die Sicherheit fördernde Vorteile:

  • - eine bessere Abdichtung im Bereich der elastischen Ringdichtung,
  • - eine erhöhte Festigkeit der Verbindung durch ein verstärktes Anpressen der beiden hohlzylindrischen Teile aneinander und
  • - eine erhöhte Bremswirkung auf den Verbindungsring, so dass sich dieser erst bei gelösten Spannmitteln leicht drehen lässt.
This object is achieved according to the invention in that tensioning means acting between the connecting ring and one of the two parts are provided, which in the connected state bring about a relative movement of the part having the projections with respect to the part having the shoulder in the sense of a compression or a further compression of the ring seal. This design of the coupling makes it possible to carry out the tight connection of the two parts in two steps: first - after the two parts have been put together - a loose connection is produced by rotating the connecting ring, which may cause only a slight stress on the elastic ring seal, and only then is a firm, pressure-tight connection created with the aid of the tensioning means, the ring seal only being evenly loaded by axial forces. Accordingly, the clutch is released in reverse order in two steps. The step-by-step procedure gently stresses the ring seal, since rotating forces on the seal only occur when the connection is loose. The tensioning means with which a relatively large preload of the ring seal can be achieved also result in the following safety-promoting advantages for the coupling:
  • - a better seal in the area of the elastic ring seal,
  • - An increased strength of the connection by an increased pressing of the two hollow cylindrical parts against each other and
  • - An increased braking effect on the connecting ring, so that it can only be turned easily when the clamping devices are released.

Die zuletzt genannte Wirkung macht aus der Kupplung zusätzlich eine Sicherheitskupplung, wobei durch entsprechende Auslegung seiner Bauteile ein unbeabsichtigtes Öffnen praktisch ausgeschlossen wird.The last-mentioned effect also turns the clutch into a safety clutch, with the appropriate design of its components practically precluding unintentional opening.

Infolge der - bei gelösten Spannmitteln - leichten Drehbarkeit des Verbindungsringes und des nur geringen Aufwandes beim Betätigen der Spannmittel, erfordert das Handhaben der erfindungsgemässen Kupplung etwa den gleichen Zeitaufwand wie die der herkömmlichen Kupplung, bei der der Verbindungsring mit grösserem Kraftaufwand gedreht werden muss.As a result of the easy rotation of the connecting ring in the case of released clamping means and the little effort involved in actuating the clamping means, the handling of the coupling according to the invention requires approximately the same amount of time as that of the conventional coupling, in which the connecting ring has to be rotated with greater effort.

Ein bevorzugtes Ausführungsbeispiel der Erfindung wird in der folgenden Beschreibung anhand der Zeichnung näher erläutert, die eine Kupplung im Axialschnitt zeigt.A preferred embodiment of the invention is explained in more detail in the following description with reference to the drawing, which shows a coupling in axial section.

Die als Ganzes mit 1 bezeichnete Kupplung weist einen ersten hohlzylindrischen Teil 2 und einen zweiten hohlzylindrischen Teil 3 auf, die koaxial zueinander angeordnet sind. Der erste Teil 2 steckt mit einem Ansatz 2' in einer entsprechenden Ausnehmung 3' des zweiten Teils 3, wobei zwischen zwei einander gegenüberstehenden Stirnflächen 5' bzw. 6 der Teile 2 und 3 eine elastische Ringdichtung 4 in Form eines O-Ringes angeordnet ist. Der O-Ring 4, der den Ansatz 2' umschliesst, liegt in einer Ringnut, die sich am Übergang vom Ansatz 2' zu einer flanschartigen Schulter 5 des ersten Teils 2 befindet. Ein Verbindungsring 7 umgibt die Schulter 5 des ersten Teils 2 und den der Schulter benachbarten Bereich des zweiten Teils 3. Der Verbindungsring 7 weist an seinem dem Teil 3 zugewendeten Ende drei radial nach innen gerichtete Nocken 12 in Form von eingenieteten Stiften auf, die in je eine von drei Nuten 13 eingreifen, die im äusseren Umfang des zweiten Teils 3 schraubenlinienförmig verlaufen, und zwar nach der Art eines Rechtsgewindes. Die Nuten 13 sind an der Stirnfläche 6 offen und am anderen Ende geschlossen. Sie erstrecken sich etwa über einen Drittel des Umfangs des Teiles 3. Das geschlossene Ende der Nuten 13 verläuft - abweichend vom übrigen Verlauf - ein kurzes Stück rechtwinklig zur Kupplungsachse, so dass die Stifte 12 am geschlossenen Ende der Nuten eine Raststellung einnehmen.The coupling designated as a whole by 1 has a first hollow cylindrical part 2 and a second hollow cylindrical part 3, which are arranged coaxially to one another. The first part 2 is inserted with a shoulder 2 'in a corresponding recess 3' of the second part 3, an elastic ring seal 4 in the form of an O-ring being arranged between two opposing end faces 5 'and 6 of parts 2 and 3. The O-ring 4, which surrounds the extension 2 ', lies in an annular groove which is located at the transition from the extension 2' to a flange-like shoulder 5 of the first part 2. A connecting ring 7 surrounds the shoulder 5 of the first part 2 and the region of the second part 3 adjacent to the shoulder. The connecting ring 7 has at its end facing the part 3 three radially inwardly directed cams 12 in the form of riveted pins, each in engage one of three grooves 13 which run helically in the outer circumference of the second part 3, namely in the manner of a right-hand thread. The grooves 13 are open at the end face 6 and closed at the other end. They extend approximately over a third of the circumference of part 3. The closed end of the grooves 13 runs - in contrast to the rest of the course - a short distance at right angles to the coupling axis, so that the pins 12 assume a locking position at the closed end of the grooves.

Oberhalb der Schulter 5 ist zwischen dem ersten Teil 2 und dem Verbindungsring 7 ein Schraubring 8 vorgesehen, der mit seinem Aussengewinde in ein Innengewinde des Verbindungsringes 7 geschraubt ist. Die in der Zeichnung untere Strinfläche des Schraubringes 8 stützt sich über eine ringförmige, aus einem gewellten elastischen Blech gebildete Feder 9 und eine Unterlagsscheibe 10 auf einer Schulterfläche 11 ab, die die dem zweiten Teil 3 abgewendete Fläche der Schulter 5 ist. Der Schraubring 8 bildet hier die zwischen dem Verbindungsring 7 und dem ersten Teil 2 angreifenden Spannmittel.A screw ring 8 is provided above the shoulder 5 between the first part 2 and the connecting ring 7 and is screwed with its external thread into an internal thread of the connecting ring 7. The lower surface of the screw ring 8 in the drawing is supported by an annular, formed from a corrugated elastic sheet metal spring 9 and a washer 10 on a shoulder surface 11, which is the surface of the shoulder 5 facing away from the second part 3. The screw ring 8 here forms the clamping means acting between the connecting ring 7 and the first part 2.

Um das Drehen des Verbindungsringes 7 und des Schraubringes 8 von Hand zu erleichtern, sind beide Ringe am äusseren Umfang mit einer Rändelung 7' bzw. 8' versehen.In order to facilitate the turning of the connecting ring 7 and the screw ring 8 by hand, both rings are provided with knurling 7 'and 8' on the outer circumference.

Der Ansatz 2' weist eine schmale Längsnut 15 auf, zu der passend eine Rippe 16 in der Ausnehmung 3' vorgesehen ist, um ein gegenseitiges Verdrehen des ersten und des zweiten Teils 2 bzw. 3 zu verhindern.The projection 2 'has a narrow longitudinal groove 15, to which a rib 16 is suitably provided in the recess 3' in order to prevent the first and second parts 2 and 3 from rotating relative to one another.

Innerhalb des ersten Teils 2 ist ein Signalleitungen enthaltendes Kabel 17 angeordnet, das an einer Steckerhälfte 1 T angeschlossen ist, die im Innern des ersten Teils 2 dicht befestigt ist und aus Kunststoff besteht. Entsprechend ist im zweiten Teil 3 ein Signalleitungen enthaltendes Kabel 19 und die zweite Steckerhälfte 19' angebracht. Die Steckerstifte sind mit 18 bezeichnet. Beim Einstecken des Ansatzes 2' werden also auch die beiden Hälften des Steckers 17', 19' miteinander elektrisch verbunden.Arranged within the first part 2 is a cable 17 containing signal lines, which is connected to a connector half 1 T, which is tightly fastened in the interior of the first part 2 and is made of plastic. Correspondingly, a cable 19 containing signal lines and the second connector half 19 'are attached in the second part 3. The connector pins are designated 18. When the extension 2 'is inserted, the two halves of the plug 17', 19 'are also electrically connected to one another.

Das Verbinden der Kupplung 1 geschieht folgendermassen: Der erste Teil 2 wird mit seinem Ansatz in die Ausnehmung 3' des zweiten Teils 3 gesteckt, wobei die Rippe 16 mit der Längsnut 15 fluchten muss, so dass ein Entstehen von falschen Kontakten zwischen den beiden Hälften 17' und 19' des Steckers vermieden wird. Danach wird der Verbindungsring 7 leicht gegen den zweiten Teil 3 gedrückt und gedreht, bis die Stifte 12 in die schraubenförmigen Nuten 13 eingreifen und am geschlossenen Ende der Nuten einrasten. Der Schraubring 8 muss dabei so eingestellt sein, dass er in dieser Raststellung die Feder 9 nur leicht gegen die Unterlagsscheibe 10 drückt, so dass beim Drehen des Verbindungsringes 7 der O-Ring 4 nur wenig belastet wird. Bis hierher wurde also der erste Verbindungsschritt durchgeführt, und es existiert ein nur lockerer Verbindungszustand. Im zweiten Schritt wird der Schraubring 8 von Hand so weit gedreht, bis er kräftig auf die Feder 9 drückt und über die Unterlagsscheibe 10 und die Schulter 5 den O-Ring 4 weiter zusammenpresst. Der O-Ring wird beim Drehen des Ringes 8 lediglich in axialer Richtung sowie gleichmässig über seinen Umfang belastet. Selbst in diesem belasteten Zustand schützt die Feder 9 den O-Ring 4 vor übermässiger Beanspruchung durch nichtaxiale Kräfte, die auf die Kupplung 1 wirken. Die Kupplung hat jetzt ihren festen Verbindungszustand inne. Das Lösen der Kupplung 1 erfolgt in der umgekehrten Reihenfolge der oben beschriebenen Schritte.The coupling 1 is connected as follows: the first part 2 is inserted with its shoulder into the recess 3 'of the second part 3, the rib 16 having to be aligned with the longitudinal groove 15, so that incorrect contacts are formed between the two halves 17 'and 19' of the plug is avoided. Thereafter, the connecting ring 7 is pressed slightly against the second part 3 and rotated until the pins 12 engage in the helical grooves 13 and engage at the closed end of the grooves. The screw ring 8 must be set so that in this locking position it presses the spring 9 only slightly against the washer 10, so that the O-ring 4 is loaded only slightly when the connecting ring 7 is turned. So far, the first connection step has been carried out, and there is only a loose connection state. In the second step, the screw ring 8 is turned by hand until it presses firmly on the spring 9 and further compresses the O-ring 4 via the washer 10 and the shoulder 5. The O-ring is loaded only when rotating the ring 8 in the axial direction and evenly over its circumference. Even in this loaded condition, the spring 9 protects the O-ring 4 against excessive stress caused by non-axial forces that act on the clutch 1. The coupling is now in its fixed connection state. The clutch 1 is released in the reverse order of the steps described above.

Im fest geschlossenen Zustand bewirkt die relativ grosse axiale Belastung auf den Gewindeflanken des Schraubringes 8 und des Verbindungsringes 7 sowie auf der Schulterfläche 11 und der Berührungsfläche zwischen den Stiften 12 und den Nuten 13 das Entstehen von wesentlichen bremsenden Reibungskräften, so dass ein unbeabsichtigtes Drehen des Verbindungsringes 7 praktisch ausgeschlossen ist. Erst nach dem Lösen des Schraubringes 8 lässt sich der Ring 7 wieder lösen.In the tightly closed state, the relatively large axial load on the thread flanks of the screw ring 8 and the connecting ring 7, as well as on the shoulder surface 11 and the contact surface between the pins 12 and the grooves 13, causes substantial braking frictional forces to occur, so that the connecting ring rotates unintentionally 7 is practically excluded. Only after loosening the screw ring 8 can the ring 7 be loosened again.

In dem beschriebenen Ausführungsbeispiel bilden die zwischen den Nuten 13 stehengebliebenen Wandabschnitte des Teils 3 die mit den Nocken 12 zusammenwirkenden Vorsprünge. Diese Vorsprünge und die Nocken könnten aber auch so ausgebildet sein, dass sie beim Herstellen der lockeren Verbindung zuerst nur axial gegeneinander bewegt werden, wobei sie sich aneinander vorbeibewegen, und dann erst der Verbindungsring gedreht wird, so dass die Nocken - in axialer Richtung der Kupplung gesehen - hinter die Vorsprünge zu liegen kommen. Es ist möglich, dass in diesem lockeren Verbindungszustand die Ringdichtung praktisch noch unbelastet ist. Danach erfolgt im zweiten Verbindungsschritt das Zusammenpressen der Ringdichtung mittels des Schraubringes.In the exemplary embodiment described, the wall sections of part 3 which have remained between the grooves 13 form the projections which cooperate with the cams 12. These projections and the cams could, however, also be designed such that when the loose connection is established, they are first only moved axially against one another, moving past one another, and only then is the connecting ring rotated, so that the cams - in the axial direction of the coupling seen - come to lie behind the projections. It is possible that the ring seal is still practically unloaded in this loose connection state. Then, in the second connection step, the ring seal is pressed together using the screw ring.

Die Ringdichtung 4 kann - statt zwischen den Stirnflächen 5' und 6' - zwischen den beiden Hälften 17' und 19' des Steckers angeordnet sein, wobei sich der Durchmesser der Schulter 5 etwas verringern lässt. Anstelle des Schraubringes 8 kann als Spannmittel ein bei Schnappverschlüssen bekanntes Hebelsystem angewendet werden. Anstatt zwischen dem Verbindungsring 7 und dem ersten Teil 2 können die Spannmittel auch zwischen dem genannten Ring und dem zweiten Teil angreifen.The ring seal 4 can - instead of between the end faces 5 'and 6' - be arranged between the two halves 17 'and 19' of the plug, wherein the diameter of the shoulder 5 can be reduced somewhat. Instead of the screw ring 8, a lever system known from snap locks can be used as the clamping means. Instead of between the connecting ring 7 and the first part 2, the clamping means can also engage between the said ring and the second part.

Claims (5)

1. A bayonet coupling, more particularly for an electric plug, a first hollow cylindrical part being coaxially connected in pressure-tight manner to a second hollow cylindrical part and, in the connected state, an axial projection of the first part is inserted into a correspondingly shaped axial recess in the second part and an annular seal is provided between two facing ends of the two parts and one of the two parts has a shoulder and an axially movable and rotatable connecting ring extending over the shoulder, the inner surface of the connecting ring having readially projecting cams which co-operate with correspondingly shaped and disposed projections on the other part in order to join the two parts, characterised in that clamping means are provided and engage between the connecting ring and one of te two parts and in the joined state cause the part formed with projections to move relative to the part having a shoulder in order to compress or additionally compress the annular seal.
2. A coupling according to claim 1, characterised in that the clamping means engage between the connecting ring and the part having the shoulder.
3. A coupling according to claim 2, characterised in that the clamping means comprise a helical ring adapted to be screwed into the connecting ring and bearing against the shoulder when tightened.
4. A coupling according to any of claims 1 to 3, characterised in that a spring is disposed between the shoulder and the connecting extending over it.
5. A coupling according to any of claims 1 to 4, characterised in that the projections co-operating with the cams are helical grooves formed between the cams and in which the cams engage when the parts are joined, and at their closed end the helical cams extend for a short distance at right angles to the axis of the corresponding hollow cylindrical part.
EP86101131A 1985-03-06 1986-01-29 Bayonet-like coupling for connecting two hollow tubular parts Expired EP0197249B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1007/85A CH667164A5 (en) 1985-03-06 1985-03-06 BAYONET-CLUTCH FOR CONNECTING TWO HOLLOW CYLINDRICAL PARTS.
CH1007/85 1985-03-06

Publications (2)

Publication Number Publication Date
EP0197249A1 EP0197249A1 (en) 1986-10-15
EP0197249B1 true EP0197249B1 (en) 1989-03-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86101131A Expired EP0197249B1 (en) 1985-03-06 1986-01-29 Bayonet-like coupling for connecting two hollow tubular parts

Country Status (5)

Country Link
US (1) US4648635A (en)
EP (1) EP0197249B1 (en)
JP (1) JPS61206184A (en)
CH (1) CH667164A5 (en)
DE (1) DE3662549D1 (en)

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Publication number Publication date
DE3662549D1 (en) 1989-04-27
EP0197249A1 (en) 1986-10-15
US4648635A (en) 1987-03-10
JPS61206184A (en) 1986-09-12
CH667164A5 (en) 1988-09-15

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