EP0375087A1 - Contact arrangement with a conductive pivot for a contact lever - Google Patents

Contact arrangement with a conductive pivot for a contact lever Download PDF

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Publication number
EP0375087A1
EP0375087A1 EP89250111A EP89250111A EP0375087A1 EP 0375087 A1 EP0375087 A1 EP 0375087A1 EP 89250111 A EP89250111 A EP 89250111A EP 89250111 A EP89250111 A EP 89250111A EP 0375087 A1 EP0375087 A1 EP 0375087A1
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EP
European Patent Office
Prior art keywords
contact
legs
contact lever
lever
pivot bearing
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
EP89250111A
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German (de)
French (fr)
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EP0375087B1 (en
Inventor
Bernard Dimarco
Steven Alan Kaufman
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Siemens AG
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Siemens AG
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Publication of EP0375087A1 publication Critical patent/EP0375087A1/en
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Publication of EP0375087B1 publication Critical patent/EP0375087B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H01H77/102—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5833—Electric connections to or between contacts; Terminals comprising an articulating, sliding or rolling contact between movable contact and terminal

Definitions

  • the invention relates to a contact arrangement with a pivotably mounted contact lever and a busbar carrying a current-carrying pivot bearing for the contact lever, the pivot bearing comprising at least two mutually angled legs and a bearing pin with at least one cylindrical bearing pin resting on the legs under the force of a spring .
  • a contact arrangement of this type is known from US-A-4,554,427.
  • the contact lever forms the stationary counter-contact of a likewise pivotably mounted contact lever, which can be moved arbitrarily by a drive mechanism of the circuit breaker or as a function of automatic triggers for switching the circuit breaker on and off.
  • An independent of the drive mechanism and the triggers opening of the contact lever comes under the influence of very high currents, such as occur in particular in the event of a short circuit, in that the contact lever connected to the drive mechanism and the contact lever mounted on the busbar under the influence of a electrodynamic loop force are separated.
  • FIG. 7 illustrates the generation of the contact-lifting forces using the example of two contact parts 1 and 2 which are in butt contact.
  • the object of the invention is to design a current-carrying pivot bearing in such a way that the contact-lifting forces are as low as possible and therefore a good current transfer is ensured with a comparatively low spring force.
  • a separate contact force spring for the joint arrangement can be omitted according to a further development of the invention if the legs of the pivot bearing are formed by a hook-like bend at one end of the busbar and if the opening between the legs arranged at an acute angle to one another is aligned approximately with the longitudinal direction of the contact lever.
  • a single spring can provide both the contact force which is required for interaction with the further contact lever actuated by the drive mechanism of the circuit breaker and the pressing force of the contact lever against its pivot bearing.
  • This spring can be designed as a tension spring which is stretched between a fixed abutment provided near the joint arrangement and an abutment arranged on the contact lever.
  • the contact lever has an opening for receiving the bearing pin with two essentially flat and angled boundary surfaces. In this way, a good current transfer is ensured between the contact lever and the bearing pin due to the wedge-shaped interaction by forming two contact areas in a similar manner as between the bearing pin and the legs which are at an acute angle to one another.
  • FIG. 1 shows a low-voltage circuit breaker of compact design with an insulating housing (MCCB), partially broken open and partially in section, which contains a contact arrangement according to the invention.
  • MCCB insulating housing
  • Figures 2 and 3 show a side view and a top view of a stationary busbar and a pivoted contact lever. Details of the contact arrangement according to FIGS. 2 and 3 are also shown in a side view in FIG. 4.
  • FIG. 5 shows a hook-like bend at the inner end of a busbar shown in FIGS. 2, 3 and 4 to illustrate the forces that occur during power transmission.
  • FIG. 6 shows the end region of a contact lever on the bearing side.
  • FIG. 7 serves to illustrate the development of current-dependent contact-lifting forces.
  • a low-voltage circuit breaker 10 shown in FIG. 1 is partially broken open and shown in section so that part of a drive mechanism and the contact system of a pole can be seen, which comprises contact levers 12 and 14.
  • the contact lever 12 can be pivoted arbitrarily by the drive mechanism upon actuation of a handle 11 for switching on and off.
  • the contact lever 12 can also be brought into the switch-off position by a trigger in a manner which is not shown in detail, but is generally known.
  • a drive mechanism 18 is indicated in FIG. 1 and can comprise, in a known manner, a toggle lever system, at least one over-center spring and latching parts.
  • FIG. 2 illustrates two positions of the contact lever 14, which can be pivoted about a bearing pin 28. Both contact levers 12 and 14 each carry a contact pad 16 for the current transfer, so that there is an overall loop-shaped current path. If a sufficient current flows through the current path, as occurs in the event of a short circuit, then the contact lever 14, under the influence of the loop force and the current-dependent forces already explained with reference to FIG. 7, passes between the contact pads 16 from the rest position shown in the broken line shown withdrawal position.
  • tension springs 20 which are arranged on both sides of the contact lever 14 according to FIG. 3.
  • the tension springs 20 are suspended on the one hand on a pin 22 which passes through the contact lever 14 approximately in the middle.
  • the opposite end of each of the tension springs 20 engages a fixed abutment 24, which is part of a stop body 26.
  • the stop body 26 has two lugs 30 against which the pin 22 bears under the action of the tension springs 20 when the contact lever 12 (FIG. 1) is raised by the contact lever 14. 4, the stop body 26 is fastened to the busbar 34 by means of a rivet 32.
  • the busbar 34 is forked by an incision, the fork ends 36 being bent like hooks to form legs 37 and 38.
  • the inner surfaces 40 and 42 of the legs 37 and 38 are at an angle of approximately 30 °, the opening between the legs being oriented approximately to the longitudinal direction of the contact lever 14, as FIGS. 2 and 4 show.
  • the contact lever 14 rests between the fork ends 36 with an end part 39, as can be seen in particular from FIG. 3.
  • the end part 39 has an opening 43 which has two boundary surfaces 44 and 46 inclined at an angle of approximately 15 ° to one another.
  • a bearing pin 28 extends through the opening 43, the ends of which engage as bearing pins in the fork ends 36 of the busbar 34.
  • the contact lever 14 with the boundary surfaces 44 and 46 is thus pressed in a wedge-like manner against the central region of the bearing pin 28, as a result of which in turn the bearing pin 28 is placed against the inner surfaces 40 and 42 of the legs 37 and 39 of the busbar 34.
  • the spacing of the abutment 24 from the axis of the bearing pin 28 also causes the contact lever 14 to be pretensioned into the position which is shown in extended form in FIG.
  • the contact areas 48 and 50 shown in FIG. 6 between the bearing pin 28 and the boundary surfaces 44 and 46 of the opening 43 in the end part 39 and two contact areas 52 and 54 each represent the current transfer from the contact lever 14 to the busbar 34 (FIG. 5 ) is available at each end of the bearing pin 28 and the associated fork end 36. Due to the wedge-like interaction of the parts and the pressure force provided by the tension springs 20, these six contact areas allow a safe current transfer.

Abstract

A contact arrangement for a low-voltage circuit breaker of compact construction exhibits a contact lever (14) which is pivotably supported on a busbar (34). The pivot comprises hook-like bent fork ends (36) the legs of which (37, 38) are at an acute angle with respect to one another. The opening between the legs is approximately aligned with the longitudinal direction of the contact lever (14) in such a manner that a tension spring (20), acting at the same time as contact force spring, pretensions the contact lever (14) between the legs (37, 38) in a wedge-like manner by means of a bearing bolt (28). Lifting forces dependent on the current to be transmitted are largely compensated. <IMAGE>

Description

Die Erfindung betrifft eine Kontaktanodnung mit einem schwenk­bar gelagerten Kontakthebel und einer ein stromübertragend ausgebildetes Schwenklager für den Kontakthebel tragenden Stromschiene, wobei das Schwenklager wenigstens zwei winklig zueinander stehende Schenkel und einen Lagerbolzen mit wenigstens einem zylindrischen, an den Schenkeln unter der Kraft einer Feder anliegenden Lagerzapfen umfaßt.The invention relates to a contact arrangement with a pivotably mounted contact lever and a busbar carrying a current-carrying pivot bearing for the contact lever, the pivot bearing comprising at least two mutually angled legs and a bearing pin with at least one cylindrical bearing pin resting on the legs under the force of a spring .

Eine Kontaktanordnung dieser Art ist durch die US-A-4 554 427 bekannt geworden. Der Kontakthebel bildet dabei den ortsfesten Gegenkontakt eines gleichfalls schwenkbar gelagerten Kontakt­hebels, der durch einen Antriebsmechanismus des Leistungs­schalters willkürlich oder in Abhängigkeit selbsttätiger Aus­löser zum Ein- und Ausschalten des Leistungsschalters beweg­bar ist. Eine von dem Antriebsmechanismus und den Auslösern unabhängige Öffnung der Kontakthebel kommt unter dem Einfluß sehr hoher Ströme, wie sie insbesondere bei einem Kurzschluß auftreten, dadurch zustande, daß der mit dem Antriebsmecha­nismus in Verbindung stehende Kontakthebel und der an der Stromschiene gelagerte Kontakthebel unter dem Einfluß einer elektrodynamischen Schleifenkraft voneinander getrennt werden.A contact arrangement of this type is known from US-A-4,554,427. The contact lever forms the stationary counter-contact of a likewise pivotably mounted contact lever, which can be moved arbitrarily by a drive mechanism of the circuit breaker or as a function of automatic triggers for switching the circuit breaker on and off. An independent of the drive mechanism and the triggers opening of the contact lever comes under the influence of very high currents, such as occur in particular in the event of a short circuit, in that the contact lever connected to the drive mechanism and the contact lever mounted on the busbar under the influence of a electrodynamic loop force are separated.

Bei der erwähnten bekannten Kontaktanordnung ist ein strom­übertragend ausgebildetes Schwenklager vorgesehen, um ein biegsames Stromband als Verbindung zwischen dem schwenkbaren Kontakthebel und der ortsfesten Stromschiene zu vermeiden. Jedoch sind auch solche stromübertragenden Schwenklager nicht frei von Problemen, da sie gleichfalls den kontaktabhebenden Kräften ausgesetzt sind, die zu der elektrodynamischen Öffnung der zusammenwirkenden Kontakthebel führen. Dies kann den Stromübergang zwischen dem Kontakthebel und der ortsfesten Stromschiene beeinträchtigen und Schäden an den zusammen­wirkenden Kontaktflächen hervorrufen. Daher ist es erforderlich, verhältnismäßig starke Kontaktkraftfedern im Bereich des Schwenklagers zu verwenden, um die kontaktabhebenden Kräfte zu kompensieren. In der Figur 7 ist die Entstehung der kontakt­abhebenden Kräfte an dem Beispiel von zwei stumpf miteinander in Berührung stehender Kontaktteile 1 und 2 veranschaulicht. Da der Stromübergang zwischen den Kontaktteilen 1 und 2 nicht gleichmäßig über den gesamten Querschnitt erfolgt, sondern sich auf einzelne räumlich begrenzte Kontaktbereiche beschränkt, kommt es nahe solchen Kontaktbereichen zu einer Änderung im Verlauf der mit "I" bezeichneten Stromfäden. Hierdurch ent­stehend Anteile des Stromes, die in Richtung der Pfeile A und B verlaufen, und die antiparallel zueinander gerichtet sind. Auf diese Weise entsteht eine von der Höhe des Stromes ab­hängige Kraft, die bestrebt ist, die Kontaktteile 1 und 2 voneinander zu trennen. Solche Kräfte sind zwischen stumpf aufeinanderstoßenden Kontaktteilen grundsätzlich wirksam und treten auch bei stromübertragenden Schwenklagern auf.In the known contact arrangement mentioned, a current-carrying pivot bearing is provided in order to avoid a flexible current band as a connection between the pivotable contact lever and the stationary busbar. However, such current-transmitting swivel bearings are also not free of problems, since they are also exposed to the contact-lifting forces which lead to the electrodynamic opening of the interacting contact levers. This can be the Impair the current transfer between the contact lever and the stationary busbar and cause damage to the interacting contact surfaces. It is therefore necessary to use relatively strong contact force springs in the area of the pivot bearing in order to compensate for the contact-lifting forces. FIG. 7 illustrates the generation of the contact-lifting forces using the example of two contact parts 1 and 2 which are in butt contact. Since the current transfer between the contact parts 1 and 2 does not take place uniformly over the entire cross-section, but is limited to individual spatially limited contact areas, a change occurs in the course of the current threads labeled "I" near such contact areas. This creates portions of the current which run in the direction of arrows A and B and which are directed antiparallel to one another. In this way, a force depends on the level of the current and tends to separate the contact parts 1 and 2 from one another. Such forces are generally effective between butt-abutting contact parts and also occur with current-transmitting pivot bearings.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, ein stromführendes Schwenklager derart auszubilden, daß die kontaktabhebenden Kräfte so gering wie möglich werden und daher ein guter Stromübergang bei vergleichsweise geringer Federkraft sichergestellt ist.Proceeding from this, the object of the invention is to design a current-carrying pivot bearing in such a way that the contact-lifting forces are as low as possible and therefore a good current transfer is ensured with a comparatively low spring force.

Diese Aufgabe wird bei einer Kontaktanordnung der eingangs ge­nannten Art dadurch gelöst, daß die Schenkel des Schwenklagers spitzwinklig zueinander stehend angeordnet sind. Hierdurch wird erreicht, daß die resultierende kontaktabhebende Kraft nur gering ist und somit nur eine entsprechend geringe kom­pensierende Federkraft aufgebracht werden muß. Aufgrund des keilartigen Zusammenwirkens zwischen dem Lagerbolzen und den Schenkeln des Schwenklager ist dennoch die Andruckkraft zwischen den Kontaktflächen groß.This object is achieved in a contact arrangement of the type mentioned in that the legs of the pivot bearing are arranged at an acute angle to one another. This ensures that the resulting contact-lifting force is only slight and thus only a correspondingly small compensating spring force has to be applied. Due to the wedge-like interaction between the bearing pin and the legs of the pivot bearing, the pressure force between the contact surfaces is nevertheless large.

Eine gesonderte Kontaktkraftfeder für die Gelenkanordnung kann nach einer Weiterbildung der Erfindung entfallen, wenn die Schenkel des Schwenlagers durch eine hakenartige Biegung an dem einen Ende der Stromschiene gebildet sind und wenn die Öffnung zwischen den spitzwinklig zueinander angeordneten Schenkeln etwa auf die Längsrichtung des Kontakthebels ausge­richtet ist. In diesem Fall kann nämlich durch eine einzige Feder sowohl die Kontaktkraft bereitgestellt werden, die für das Zusammenwirken mit dem weiteren, von dem Antriebsmechanis­mus des Leistungsschalter betätigten Kontakthebel benötigt wird, als auch die Andruckkraft des Kontakthebels gegenüber seinem Schwenklager. Diese Feder kann als Zugfeder ausgebildet sein, die zwischen einem ortsfesten, nahe der Gelenkanordnung vorgesehenen Widerlager und einem an dem Kontakthebel angeord­neten Widerlager ausgespannt ist.A separate contact force spring for the joint arrangement can be omitted according to a further development of the invention if the legs of the pivot bearing are formed by a hook-like bend at one end of the busbar and if the opening between the legs arranged at an acute angle to one another is aligned approximately with the longitudinal direction of the contact lever. In this case, a single spring can provide both the contact force which is required for interaction with the further contact lever actuated by the drive mechanism of the circuit breaker and the pressing force of the contact lever against its pivot bearing. This spring can be designed as a tension spring which is stretched between a fixed abutment provided near the joint arrangement and an abutment arranged on the contact lever.

Zur sicheren Stromübertragung zwischen dem Kontakthebel und der Stromschiene kann noch dadurch beigetragen werden, daß der Kontakthebel eine zur Aufnahme des Lagerbolzens dienende Öff­nung mit zwei im wesentlichen ebenen und winklig zueinander stehenden Begenzungsflächen aufweist. Auf diese Weise wird zwischen dem Kontakthebel und dem Lagerbolzen aufgrund des keilförmigen Zusammenwirkens in ähnlicher Weise durch Bildung von zwei Kontaktbereichen eine gute Stromübertragung wie zwischen dem Lagerbolzen und den spitzwinkig zueinander stehenden Schenkeln gewährleistet.For safe current transmission between the contact lever and the busbar, it can also be contributed that the contact lever has an opening for receiving the bearing pin with two essentially flat and angled boundary surfaces. In this way, a good current transfer is ensured between the contact lever and the bearing pin due to the wedge-shaped interaction by forming two contact areas in a similar manner as between the bearing pin and the legs which are at an acute angle to one another.

Es hat sich erwiesen, daß ein günstiges Verhalten des Schwenk­lagers erzielt wird, wenn die Schenkel unter einem Winkel von etwa 30° angeordnet sind und wenn die Begrenzungsflächen der Öffnung des Kontakthebels unter einem Winkel von etwa 15° zueinander stehen. Demgegenüber stehen bei der bekannten Kon­taktanordnung (US-A-4 554 427) die Schenkel des Schwenklagers unter einem Winkel von 90° zueinander.It has been found that favorable behavior of the pivot bearing is achieved if the legs are arranged at an angle of approximately 30 ° and if the boundary surfaces of the opening of the contact lever are at an angle of approximately 15 ° to one another. In contrast, the legs of the pivot bearing are at an angle of 90 ° to each other in the known contact arrangement (US-A-4 554 427).

Die Erfindung wird im folgenden anhand des in den Figuren dargestellten Ausführungsbeispieles näher erläutert.The invention is described below with reference to the figures illustrated embodiment explained in more detail.

Die Figur 1 zeigt einen teilweise aufgebrochen und teilweise im Schnitt dargestellten Niederspannungs-Leistungsschalter kompakter Bauart mit Isolierstoffgehäuse (MCCB), der eine Kontaktanordnung nach der Erfindung enthält.FIG. 1 shows a low-voltage circuit breaker of compact design with an insulating housing (MCCB), partially broken open and partially in section, which contains a contact arrangement according to the invention.

Die Figuren 2 und 3 zeigen in einer Seitenansicht und in der Draufsicht eine ortsfesten Stromschiene und einen daran schwenkbar gelagerten Kontakthebel. Einzelheiten der Kontakt­anordnung gemäß den Figuren 2 und 3 zeigt gleichfalls in einer Seitenansicht die Figur 4.Figures 2 and 3 show a side view and a top view of a stationary busbar and a pivoted contact lever. Details of the contact arrangement according to FIGS. 2 and 3 are also shown in a side view in FIG. 4.

Die Figur 5 zeigt eine hakenartige Biegung an dem inneren Ende einer in den Figuren 2, 3 und 4 dargestellten Stromschiene zur Veranschaulichung von Kräften, die bei der Stromübertragung auftreten.FIG. 5 shows a hook-like bend at the inner end of a busbar shown in FIGS. 2, 3 and 4 to illustrate the forces that occur during power transmission.

In der Figur 6 ist der lagerseitige Endbereich eines Kontakt­hebels gezeigt.FIG. 6 shows the end region of a contact lever on the bearing side.

Die Figur 7 dient zur Veranschaulichung der Entstehung stom­abhängiger kontaktabhebender Kräfte.FIG. 7 serves to illustrate the development of current-dependent contact-lifting forces.

Ein in der Figur 1 gezeigter Niederspannungs-Leistungsschalter 10 ist teilweise aufgebrochen und geschnitten derart dargestellt, daß ein Teil eines Antriebsmechanismus und das Kontaktsystem eines Poles erkennbar sind, welches Kontakthebel 12 und 14 um­faßt. Der Kontakthebel 12 ist durch den Antriebsmechanismus bei Betätigung eines Handgriffes 11 willkürlich zum Ein- und Aus­schalten schwenkbar. Gleichfalls ist der Kontakthebel 12 in nicht näher dargestellter, jedoch allgemein bekannter Weise auch durch Auslöser in die Ausschaltstellung überführbar. Ein Antriebsmechanismus 18 ist in der Figur 1 angedeutet und kann in bekannter Weise ein Kniehebelsystem, wenigstens eine Über­totpunktfeder und Verklinkungsteile umfassen.A low-voltage circuit breaker 10 shown in FIG. 1 is partially broken open and shown in section so that part of a drive mechanism and the contact system of a pole can be seen, which comprises contact levers 12 and 14. The contact lever 12 can be pivoted arbitrarily by the drive mechanism upon actuation of a handle 11 for switching on and off. Likewise, the contact lever 12 can also be brought into the switch-off position by a trigger in a manner which is not shown in detail, but is generally known. A drive mechanism 18 is indicated in FIG. 1 and can comprise, in a known manner, a toggle lever system, at least one over-center spring and latching parts.

Der mit dem Kontakthebel 12 zusammenwirkende weitere Kontakt­hebel 14 bildet den Gegenkontakt, der mit einer ortsfesten Stromschiene 34 leitend in Verbindung steht. Mit ihrem äußeren Ende kann die Stromschiene 34 in Verbindung mit einer Anschlußvorrichtung stehen. Die Figur 2 veranschaulicht zwei Stellungen des Kontakthebels 14, der um einen Lagerbolzen 28 schwenkbar ist. Beide Kontakthebel 12 und 14 tragen je eine Kontaktauflage 16 für den Stromübergang, so daß sich insge­samt eine schleifenförmige Strombahn ergibt. Wird die Strombahn von einem ausreichend hohen Strom, wie er bei einem Kurzschluß auftritt, durchflossen, so gelangt der Kontakthebel 14 unter dem Einfluß der Schleifenkraft und der bereits anhand der Figur 7 erläuterten stromabhängigen Kräfte zwischen den Kon­taktauflagen 16 aus der ausgezogen gezeigten Ruhestellung in die getrichelt gezeigte Abhebestellung. Dies geschieht unter Überwindung der Kraft von Zugfedern 20, die gemäß der Figur 3 beidseitig des Kontakthebels 14 angeordnet sind. Die Zugfedern 20 sind einerseits an einem Stift 22 eingehängt, der den Kontakthebel 14 etwa mittig durchsetzt. Das gegenüberliegende Ende jeder der Zugfedern 20 greift an einem ortsfesten Wider­lager 24 an, das Teil eines Anschlagkörpers 26 ist. Der An­schlagkörper 26 weist zwei Nasen 30 auf, gegen die sich der Stift 22 unter der Wirkung der Zugfedern 20 anlegt, wenn der Kontakthebel 12 (Figur 1) von dem Kontakthebel 14 angehoben ist. Der Anschlagkörper 26 ist, wie die Figur 4 zeigt, mittels eines Nietes 32 an der Stromschiene 34 befestigt.The further contact lever 14, which interacts with the contact lever 12, forms the counter-contact, which is conductively connected to a stationary busbar 34. With its outer end, the busbar 34 can be connected to a connecting device. FIG. 2 illustrates two positions of the contact lever 14, which can be pivoted about a bearing pin 28. Both contact levers 12 and 14 each carry a contact pad 16 for the current transfer, so that there is an overall loop-shaped current path. If a sufficient current flows through the current path, as occurs in the event of a short circuit, then the contact lever 14, under the influence of the loop force and the current-dependent forces already explained with reference to FIG. 7, passes between the contact pads 16 from the rest position shown in the broken line shown withdrawal position. This is done by overcoming the force of tension springs 20 which are arranged on both sides of the contact lever 14 according to FIG. 3. The tension springs 20 are suspended on the one hand on a pin 22 which passes through the contact lever 14 approximately in the middle. The opposite end of each of the tension springs 20 engages a fixed abutment 24, which is part of a stop body 26. The stop body 26 has two lugs 30 against which the pin 22 bears under the action of the tension springs 20 when the contact lever 12 (FIG. 1) is raised by the contact lever 14. 4, the stop body 26 is fastened to the busbar 34 by means of a rivet 32.

Einzelheiten der Stromschiene 34 werden im folgenden anhand der Figur 3, 4 und 5 erläutert. An ihrem inneren Ende ist die Stromschiene 34 durch einen Einschnitt gegabelt, wobei die Gabelenden 36 unter Bildung von Schenkeln 37 und 38 haken­artig gebogen sind. Die Innenflächen 40 und 42 der Schenkel 37 und 38 stehend unter einem Winkel von etwa 30°, wobei die Öffnung zwischen den Schenkeln etwa auf die Längsrichtung des Kontakthebels 14 ausgerichtet ist, wie die Figuren 2 und 4 zeigen. Zwischen den Gabelenden 36 ruht der Kontakthebel 14 mit einem Endteil 39, wie insbesondere der Figur 3 zu entnehmen ist. Der Endteil 39 besitzt eine Öffnung 43, die zwei unter einem Winkel von etwa 15° gegeneinander geneigte Begrenzungs­flächen 44 und 46 besitzt. Durch die Öffnung 43 erstreckt sich ein Lagerbolzen 28, dessen Enden als Lagerzapfen in die Gabel­enden 36 der Stromschiene 34 eingreifen. Durch die Zugfedern 20 wird somit der Kontakthebel 14 mit den Begrenzungsflächen 44 und 46 keilartig gegen den mittleren Bereich des Lagerbolzens 28 gedrückt, wodurch seinerseits der Lagerbolzen 28 gegen die Innenflächen 40 und 42 der Schenkel 37 und 39 der Stromschiene 34 angelegt wird. Durch den Abstand des Widerlagers 24 von der Achse des Lagerbolzens 28 wird außerdem eine Vorspannung des Kontakthebels 14 in die Stellung bewirkt, die in der Figur 2 ausgezogen gezeigt ist.Details of the busbar 34 are explained below with reference to FIGS. 3, 4 and 5. At its inner end, the busbar 34 is forked by an incision, the fork ends 36 being bent like hooks to form legs 37 and 38. The inner surfaces 40 and 42 of the legs 37 and 38 are at an angle of approximately 30 °, the opening between the legs being oriented approximately to the longitudinal direction of the contact lever 14, as FIGS. 2 and 4 show. The contact lever 14 rests between the fork ends 36 with an end part 39, as can be seen in particular from FIG. 3. The end part 39 has an opening 43 which has two boundary surfaces 44 and 46 inclined at an angle of approximately 15 ° to one another. A bearing pin 28 extends through the opening 43, the ends of which engage as bearing pins in the fork ends 36 of the busbar 34. Through the tension springs 20, the contact lever 14 with the boundary surfaces 44 and 46 is thus pressed in a wedge-like manner against the central region of the bearing pin 28, as a result of which in turn the bearing pin 28 is placed against the inner surfaces 40 and 42 of the legs 37 and 39 of the busbar 34. The spacing of the abutment 24 from the axis of the bearing pin 28 also causes the contact lever 14 to be pretensioned into the position which is shown in extended form in FIG.

Für den Stromübergang von dem Kontakthebel 14 zu der Strom­schiene 34 stehen somit die in der Figur 6 gezeigten Kontakt­bereiche 48 und 50 zwischen dem Lagerbolzen 28 und den Be­grenzungsflächen 44 und 46 der Öffnung 43 in dem Endteil 39 sowie jeweils zwei Kontaktbereiche 52 und 54 (Figur 5) an jedem Ende des Lagerbolzens 28 und dem zugehörigen Gabelende 36 zur Verfügung. Diese insgesamt sechs Kontaktbereiche ermög­lichen aufgrund des keilartigen Zusammenwirkens der Teile und der durch die Zugfedern 20 bereitgestellten Andruckkraft einen sicheren Stromübergang.The contact areas 48 and 50 shown in FIG. 6 between the bearing pin 28 and the boundary surfaces 44 and 46 of the opening 43 in the end part 39 and two contact areas 52 and 54 each represent the current transfer from the contact lever 14 to the busbar 34 (FIG. 5 ) is available at each end of the bearing pin 28 and the associated fork end 36. Due to the wedge-like interaction of the parts and the pressure force provided by the tension springs 20, these six contact areas allow a safe current transfer.

Im Betrieb des Leistungsschalters 10 ruft der über die Kontakt­bereiche 52 und 54 (Figur 5) fließende Strom eine abstoßende Kraft zwischen dem Gelenkbolzen 28 und dem Innenflächen 40 und 42 hervor. Die abstoßende Kraft an dem Kontaktbereich 52 ist in der Figur 5 mit dem Pfeil X veranschaulicht. Ebenso ent­steht an dem Kontaktbereich 54 eine abstoßende Kraft in Richtung der Pfeiles Y. Wie anhand der Darstellung zu erkennen ist, sind die Kräfte entsprechend den Pfeilen X und Y einander im wesentlichen entgegengerichtet und heben sich somit größten­teils auf. Dies kommt durch die von der parallelen Stellung der Schenkel 37 und 38 nur wenig abweichende spitzwinklige Stellung zustande. Die resultierende abhebende Kraft entsprechend dem Pfeil Z ist damit nur verhältnismäßig gering. Unter der Wirkung der Zugfedern 20 verbleibt der Lagerbolzen 28 entgegen der resultierenden Kraft entsprechend dem Pfeil Z in Berührung mit den Kontaktbereichen 52 und 54, wobei ein für die sichere Stromübertragung erforderliche minimale Kontaktkraft nicht unterschritten wird.During operation of the circuit breaker 10, the current flowing through the contact areas 52 and 54 (FIG. 5) produces a repulsive force between the hinge pin 28 and the inner surfaces 40 and 42. The repulsive force at the contact area 52 is illustrated in FIG. 5 by the arrow X. Likewise, a repulsive force arises in the direction of the arrow Y at the contact area 54. As can be seen from the illustration, the forces corresponding to the arrows X and Y are essentially opposed to one another and thus largely cancel each other out. This comes from the parallel position of the Legs 37 and 38 only slightly different acute-angled position. The resulting lifting force according to arrow Z is therefore only relatively small. Under the action of the tension springs 20, the bearing pin 28 remains in contact with the contact areas 52 and 54 against the resultant force according to the arrow Z, a minimum contact force required for the safe current transmission not being undercut.

Im Rahmen der Erfindung können einzelne Merkmale abweichend von der beschriebenen und dargestellten Gestaltung abgewandelt sein. Daher können auch die angegebenen Winkelwerte von 30° zwischen den Schenkeln 37 und 38 bzw. von 15° zwischen den Begrenzungsflächen 44 und 46 verändert werden, um bestimmte Eigenschaften des Schwenklagers zu erzielen, ohne dabei das Prinip des keilartigen Zusammenwirkens unter weitgehender Kompensation der stromabhebenden Kräfte zu verlassen.Within the scope of the invention, individual features can be modified differently from the described and illustrated design. Therefore, the specified angle values of 30 ° between the legs 37 and 38 or of 15 ° between the boundary surfaces 44 and 46 can be changed in order to achieve certain properties of the pivot bearing without the principle of the wedge-like interaction while largely compensating for the current-withdrawing forces to leave.

Claims (5)

1. Kontaktanordnung mit einem schwenkbar gelagerten Kontakt­hebel (14) und einer ein stromübertagend ausgebildetes Schwenk­lager für den Kontakthebel (14) tragenden Stromschiene (34), wobei das Schwenklager wenigstens zwei winklig zueinander stehende Schenkel (37, 38) und einen Lagerbolzen (28) mit wenigstens einem zylindrischen, an den Schenkeln (37, 38) unter der Kraft einer Feder anliegenden Lagerzapfen umfaßt, dadurch gekennzeichnet, daß die Schenkel (37, 38) des Schwenklagers unter einem spitzen Winkel zueinander stehend angeordnet sind.1. Contact arrangement with a pivotably mounted contact lever (14) and a current-carrying pivot bearing for the contact lever (14) carrying busbar (34), the pivot bearing having at least two mutually angular legs (37, 38) and a bearing pin (28) comprises at least one cylindrical bearing pin which bears against the legs (37, 38) under the force of a spring, characterized in that the legs (37, 38) of the pivot bearing are arranged at an acute angle to one another. 2. Kontaktanordnung nach Anspruch 1, dadurch gekennzeichnet, daß Schenkel (37, 38) des Schwenklagers durch eine hakenartige Biegung an dem einen Ende (36) der Stromschiene (34) gebildet sind und daß die Öffnung zwischen den spitzwinklig zueinander stehenden Schenkeln (37, 38) etwa auf die Längsrichtung des Kontakthebels (34) ausgerichtet ist.2. Contact arrangement according to claim 1, characterized in that legs (37, 38) of the pivot bearing are formed by a hook-like bend at one end (36) of the busbar (34) and in that the opening between the legs (37, 37) which are at an acute angle to one another 38) is aligned approximately with the longitudinal direction of the contact lever (34). 3. Kontaktanordnung nach Anspruch 2, dadurch gekennzeichnet, daß zwischen einem ortsfesten, nahe dem Schwenklager vorgesehenen Widerlager (24) und einem an dem Kontakthebel (14) angeordneten Widerlager (22) wenigstens eine Zugfeder (20) ausgespannt ist.3. Contact arrangement according to claim 2, characterized in that between a fixed, provided near the pivot bearing abutment (24) and an on the contact lever (14) arranged abutment (22) is stretched at least one tension spring (20). 4. Kontaktanordnung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Kon­takthebel (14) eine zur Aufnahme des Lagerbolzens (28) dienende Öffnung (39) mit zwei im wesentlichn ebenen und winklig zueinander stehenden Begrenzungsflächen (44, 46) aufweist.4. Contact arrangement according to one of the preceding claims, characterized in that the contact lever (14) has a for receiving the bearing pin (28) serving opening (39) with two substantially flat and mutually angular boundary surfaces (44, 46). 5. Kontaktanordnung nach einem der vorangehenden Ansprüche, dadurch gekennzeihnet, daß der Winkel zwischen den Schenkeln (37, 38) des Schwenklagers etwa 30° beträgt und daß die Begenzungsflächen der Öffnung (39) des Kontakthebels (14) unter einem Winkel von etwa 15° zueinander stehen.5. Contact arrangement according to one of the preceding claims, characterized in that the angle between the legs (37, 38) of the pivot bearing is about 30 ° and that the boundary surfaces of the opening (39) of the contact lever (14) are at an angle of about 15 ° to each other.
EP89250111A 1988-12-16 1989-12-08 Contact arrangement with a conductive pivot for a contact lever Expired - Lifetime EP0375087B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US285479 1988-12-16
US07/285,479 US5361051A (en) 1988-12-16 1988-12-16 Pivoting circuit breaker contact arm assembly

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EP0375087A1 true EP0375087A1 (en) 1990-06-27
EP0375087B1 EP0375087B1 (en) 1993-10-27

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DE58906028D1 (en) 1993-12-02
US5361051A (en) 1994-11-01
EP0375087B1 (en) 1993-10-27

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