EP0047220B1 - Low-voltage protective circuit breaker with blocking lever - Google Patents

Low-voltage protective circuit breaker with blocking lever Download PDF

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Publication number
EP0047220B1
EP0047220B1 EP81730070A EP81730070A EP0047220B1 EP 0047220 B1 EP0047220 B1 EP 0047220B1 EP 81730070 A EP81730070 A EP 81730070A EP 81730070 A EP81730070 A EP 81730070A EP 0047220 B1 EP0047220 B1 EP 0047220B1
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EP
European Patent Office
Prior art keywords
locking lever
lever
low
carrier
movable contact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81730070A
Other languages
German (de)
French (fr)
Other versions
EP0047220A2 (en
EP0047220A3 (en
Inventor
Bernhard Preuss
Werner Koziolek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
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Publication date
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Application filed by Siemens AG filed Critical Siemens AG
Priority to AT81730070T priority Critical patent/ATE10555T1/en
Publication of EP0047220A2 publication Critical patent/EP0047220A2/en
Publication of EP0047220A3 publication Critical patent/EP0047220A3/en
Application granted granted Critical
Publication of EP0047220B1 publication Critical patent/EP0047220B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/501—Means for breaking welded contacts; Indicating contact welding or other malfunction of the circuit breaker
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/501—Means for breaking welded contacts; Indicating contact welding or other malfunction of the circuit breaker
    • H01H2071/502—Means for breaking welded contacts; Indicating contact welding or other malfunction of the circuit breaker with direct contact between manual operator and welded contact structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
    • H01H71/522—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism
    • H01H71/525—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism comprising a toggle between cradle and contact arm and mechanism spring acting between handle and toggle knee
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S200/00—Electricity: circuit makers and breakers
    • Y10S200/42—Contact welding considerations

Definitions

  • the invention relates to a low-voltage circuit breaker with a housing and with at least one fixed and a movable contact arrangement, which comprises a support seated on a control shaft and a movable contact piece attached to it with the interposition of a contact force spring and which comprises an actuating handle, a drive lever, a drive spring and a toggle lever system acting on the carrier can be switched on and off, and with a locking lever against transferring the actuating handle into the switched-off position when the movable contact piece is blocked in the switched-on position.
  • a circuit breaker of this type is known from US-A-4165 453.
  • the locking lever is designed with two arms and can be pivoted about a bearing point which is formed by the knee joint bolt of the toggle lever system connected to the movable contact arrangement.
  • One lever arm of the locking lever is located within the windings of the drive spring, while the other lever arm rests on the movable contact arrangement, specifically on the hinge pin, which establishes the connection of the toggle lever system with the movable contact arrangement. Is there a blockage of the movable contacts in the on position, for. B.
  • the invention has for its object also to provide a locking lever arrangement for a circuit breaker of the type specified, but which is particularly easy to assemble and should therefore be used in those cases where it is important to deliver the switch either with or without a locking lever arrangement.
  • this object is achieved in that the locking lever is mounted in a bearing formed in the housing and is connected to the actuating handle with its end opposite the bearing, with a working surface of the locking lever of a counter surface of the movable contact arrangement with a in the undisturbed switch-on state an only partial movement of the actuating handle in the direction of its switch-off position corresponding distance and another working surface is opposite the knee joint pin of the knee lever system.
  • this locking lever there is therefore no need for an introduction to the drive spring. Rather, it is sufficient that the drive lever and the locking lever rest against one another via suitable surfaces. It is also advantageous that the operator operating the switch perceives a clearer limitation of the mobility of the actuating handle in the case of contact welding than is the case when the locking lever is connected to the drive spring.
  • the bearing point for the locking lever can be designed as a pocket-like recess in the housing of the low-voltage circuit breaker and can be located between the switching shaft and the fixed contact arrangement, preferably below the connecting line of these parts. In this area, the bearing point can be made from a molded material without additional effort during the manufacture of the housing of the circuit breaker. At the same time, the selected arrangement of the bearing point is favorable for the application of force to the movable contact arrangement.
  • the locking lever according to the invention is also suitable for exerting an opening force on the welded contact supports of the fixed and the movable contact arrangement.
  • the locking lever can be formed by a substantially flat shaped plate which has convex contours at its end which cooperates with the bearing point of the housing and at its opposite end which cooperates with the drive lever and which has one end to form the working surface which cooperates with the movable contact arrangement angled extension carries. Simple punching operations are therefore sufficient to produce the locking lever.
  • FIG. 1 shows a multi-pole low-voltage circuit breaker in a longitudinal section in the region of the middle pole provided with the drive mechanism in the switched-off, latched state.
  • FIGS. 2 and 3 show, with the omission of all other parts of the switch shown in FIG. 1, only the drive mechanism with the contact arrangement and the locking lever in the undisturbed switch-on position or when trying to switch it off with a faulty switch-on state.
  • the low-voltage circuit breaker 1 shown in FIG. 1 belongs to the type of the so-called compact switch. It has a housing 2 made of insulating material, which has a lower part 3 and an upper part 4, which are tightly connected to one another along a parting joint 5.
  • the current path of the low-voltage Schultz switch 1 extends from a first connection device 6 via a fixed contact arrangement 7 and a movable contact arrangement 8 as well as over one Current band 9 and a conductor 11 extending through a trigger unit 10 to a further connecting device 12.
  • the fixed contact arrangement comprises a conductor piece 13 fastened to the lower part 3 of the housing 2 and a contact pad 14 connected thereto.
  • a contact force spring 21 is arranged between the contact piece 16 and the carrier 17 and ensures the required contact pressure between the contact pads 14 and 15 when the circuit breaker is switched on.
  • a toggle lever system consisting of the levers 23 engages on the carrier 17 by means of a joint pin 18. Both levers are connected to one another by a knee joint bolt 24 and by a further bolt 25 to a main pawl 27 which can be pivoted about a bearing 26.
  • a drive spring 30 also acts on the knee joint pin 24, the opposite end of which is connected to the upper end of a drive lever 31 which can be pivoted about a fixed pivot bearing.
  • the drive lever 31 can be pivoted by hand by means of an actuating handle 33 placed on the drive lever 31, which protrudes through an opening 34 in the upper part 4 of the housing 2.
  • the main pawl 27 is supported in the latched state of the circuit breaker on a locking bolt 28, as can be seen in more detail in DE-C-28 17 667. Because of the precise description of the latching arrangement in this patent specification, no further details are mentioned in the present context.
  • the drive mechanism of the low-voltage circuit breaker 1 contains a locking lever 35, which is highlighted in FIGS. 2 and 3 by choosing a thicker line width.
  • the locking lever 35 is rounded at its lower end and engages with this rounded end 36 in a pocket-like recess 37 provided on the bottom of the lower part 3 of the housing 2.
  • the opposite end 40 of the locking lever 35 also has spherically rounded surfaces which interact with straight counter surfaces of the operating handle 33.
  • a working surface is formed by a bulge 38, which in the switched-on state is opposite the knee joint pin 24 of the knee lever 23 at a short distance.
  • the locking lever 35 has an extension 41 with an angle 42, which also forms a work surface. This interacts with a counter surface of the carrier 17 of the movable contact piece 16.
  • the actuating handle 33 is located near the left end of the recess of the upper part 4 of the housing 2 shown in FIG. 1.
  • the toggle levers 23 are under the influence of the drive spring 30 in a slight dead center position such that the movable contact arrangement assumes the switch-on position in which the contact pads 14 and 15 lie on one another with a force determined by the contact force spring 21.
  • the angled portion 42 of the locking lever 35 faces a counter surface of the carrier 17 at a short distance.
  • the lower part 3 of the housing 2 has the described bearing opening (recess 37).
  • the other parts or surfaces interacting with the locking lever are present in the switch mechanism anyway. Therefore, if a circuit breaker is to be equipped with a locking lever, this is inserted with its end 36 into the recess 37 during the assembly of the switch parts, whereby it is positioned appropriately with its upper end 40 for bearing against surfaces of the actuating handle 33 and with its angled portion 42 comes near the carrier 17.
  • the locking lever 35 is provided at its lower end with a continuous rounding corresponding to an arc.
  • the locking lever can also be provided with three spherical surfaces, which form sections of this circular arc, because the small pivoting angle of the locking lever 35 does not necessarily require a continuous rounding.
  • the point of attack of the bend 42 on the carrier 17 can be varied by different shape of the extension of the locking lever in order to exert a smaller or greater breaking force on the movable contact piece.
  • the arrangement of the bearing point (recess 37) is also subject to considerations of how great the desired breaking force should be or how the bearing point can best be arranged in the housing.
  • the bearing point (recess 37) is located at the deepest point of the lower part 3 of the housing 2 below the connecting line of the selector shaft and the fixed switching element 7.
  • the toggle levers described and also the locking lever can be present in pairs to even out the force application. The same applies to other elements of the switch, e.g. B. the feathers.

Abstract

In the low-voltage circuit breaker that has a toggle lever system connecting the actuating arm to a carrier that moves the movable contact, a locking lever is provided to prevent transfer of the operating lever handle to its "off" position if the movable contact is welded to the stationary contact. The locking lever is pivoted about a bearing support formed in the housing of the circuit breaker. The opposite end of the locking lever is connected to the handle to be pivoted by it. The locking lever has an angled-off projection that extends into the path of movement of the carrier and is positioned to engage the carrier if the latter is unable to move from its "on" position due to welding of the contacts together. When the contacts are not welded together, the locking lever enforces the toggle levers to snap through to their "off" position before the angled-off part of the locking lever comes into contact with the carrier of the movable contact.

Description

Die Erfindung betrifft einen Niederspannungs-Schutzschalter mit einem Gehäuse und mit wenigstens einer feststehenden und einer beweglichen Kontaktanordnung, die einen auf einer Schaltwelle sitzenden Träger und ein daran unter Zwischenschaltung einer Kontaktkraftfeder angebrachtes bewegbares Schaltstück umfaßt und die durch einen Betätigungshandgriff, einen Antriebshebel, eine Antriebsfeder und ein an dem Träger angreifendes Kniehebelsystem ein- und ausschaltbar ist, sowie mit einem Sperrhebel gegen Überführung des Betätigungshandgriffes in die Ausschaltstellung bei Blockierung des bewegbaren Schaltstückes in der Einschaltstellung.The invention relates to a low-voltage circuit breaker with a housing and with at least one fixed and a movable contact arrangement, which comprises a support seated on a control shaft and a movable contact piece attached to it with the interposition of a contact force spring and which comprises an actuating handle, a drive lever, a drive spring and a toggle lever system acting on the carrier can be switched on and off, and with a locking lever against transferring the actuating handle into the switched-off position when the movable contact piece is blocked in the switched-on position.

Ein Schutzschalter dieser Art ist durch die US-A-4165 453 bekannt geworden. Der Sperrhebel ist dabei zweiarmig ausgebildet und um eine Lagerstelle schwenkbar, die durch den Kniegelenkbolzen des mit der beweglichen Kontaktanordnung in Verbindung stehenden Kniehebelsystems gebildet ist. Der eine Hebelarm des Sperrhebels befindet sich dabei innerhalb der Windungen der Antriebsfeder, während der andere Hebelarm an der beweglichen Kontaktanordnung, und zwar an dem Gelenkbolzen, anliegt, der die Verbindung des Kniehebelsystems mit der beweglichen Kontaktanordnung herstellt. Liegt eine Blockierung der bewegbaren Schaltstücke in der Einschaltstellung vor, z. B. infolge einer Verschweißung der Kontaktauflagen der feststehenden und der beweglichen Kontaktanordnung, so wird bei dem Versuch, den Betätigungshandgriff des Schalters in Richtung der Ausschaltstellung zu bewegen, durch den Sperrhebel auf den Kniegelenkbolzen des Kniehebelsystems eine Kraft ausgeübt, die das Kniehebelsystem in Richtung der Ausschaltbewegung durchknickt. Jedoch läßt sich der Betätigungshandgriff nicht vollständig in die Ausschaltstellung bringen, es sei denn, daß die auf das Kniehebelsystem ausgeübte Kraft zu einem Aufbrechen der Kontaktverschweißung ausreicht.A circuit breaker of this type is known from US-A-4165 453. The locking lever is designed with two arms and can be pivoted about a bearing point which is formed by the knee joint bolt of the toggle lever system connected to the movable contact arrangement. One lever arm of the locking lever is located within the windings of the drive spring, while the other lever arm rests on the movable contact arrangement, specifically on the hinge pin, which establishes the connection of the toggle lever system with the movable contact arrangement. Is there a blockage of the movable contacts in the on position, for. B. due to a welding of the contact pads of the fixed and the movable contact arrangement, when trying to move the operating handle of the switch in the direction of the switch-off position, a force is exerted by the locking lever on the knee joint pin of the toggle lever system, which forces the toggle lever system in the direction of the switch-off movement buckled. However, the operating handle cannot be brought fully into the switch-off position unless the force exerted on the toggle lever system is sufficient to break the contact weld.

Der Erfindung liegt die Aufgabe zugrunde, gleichfalls eine Sperrhebelanordnung für einen Schutzschalter der angegebenen Art zu schaffen, die jedoch besonders einfach montierbar und daher in solchen Fällen einsetzbar sein soll, wo es darauf ankommt, die Schalter wahlweise mit oder ohne Sperrhebelanordnung zu liefern.The invention has for its object also to provide a locking lever arrangement for a circuit breaker of the type specified, but which is particularly easy to assemble and should therefore be used in those cases where it is important to deliver the switch either with or without a locking lever arrangement.

Gemäß der Erfindung wird diese Aufgabe dadurch gelöst, daß der Sperrhebel in einer in das Gehäuse eingeformten Lagerstelle gelagert ist und mit seinem der Lagerstelle gegenüberliegenden Ende mit dem Betätigungshandgriff in Verbindung steht, wobei im ungestörten Einschaltzustand eine Arbeitsfläche des Sperrhebels einer Gegenfläche der beweglichen Kontaktanordnung mit einem einer nur teilweisen Bewegung des Betätigungshandgriffes in der Richtung seiner Ausschaltstellung entsprechenden Abstand und eine weitere Arbeitsfläche dem Kniegelenkbolzen des Kniehebelsystems gegenübersteht. Zur Montage dieses Sperrhebels bedarf es somit keiner Einführung in die Antriebsfeder. Vielmehr genügt es, daß der Antriebshebel und der Sperrhebel über geeignete Flächen aneinander anliegen. Vorteilhaft ist dabei ferner, daß der den Schalter Bedienende bei einer Kontaktverschweißung eine deutlichere Begrenzung der Bewegbarkeit des Betätigungshandgriffes wahrnimmt, als dies bei der Verbindung des Sperrhebels mit der Antriebsfeder der Fall ist.According to the invention, this object is achieved in that the locking lever is mounted in a bearing formed in the housing and is connected to the actuating handle with its end opposite the bearing, with a working surface of the locking lever of a counter surface of the movable contact arrangement with a in the undisturbed switch-on state an only partial movement of the actuating handle in the direction of its switch-off position corresponding distance and another working surface is opposite the knee joint pin of the knee lever system. To install this locking lever, there is therefore no need for an introduction to the drive spring. Rather, it is sufficient that the drive lever and the locking lever rest against one another via suitable surfaces. It is also advantageous that the operator operating the switch perceives a clearer limitation of the mobility of the actuating handle in the case of contact welding than is the case when the locking lever is connected to the drive spring.

Die Lagerstelle für den Sperrhebel kann als taschenartige Vertiefung des Gehäuses des Niederspannungs-Schutzschalters ausgebildet sein und kann sich zwischen der Schaltwelle und der feststehenden kontaktanordnung, vorzugsweise unterhalb der Verbindungslinie dieser Teile, befinden. In diesem Bereich läßt sich die Lagerstelle bei der Herstellung des Gehäuses des Schutzschalters aus einem Formpreßstoff ohne zusätzlichen Aufwand herstellen. Zugleich ist die gewählte Anordnung der Lagerstelle günstig für den Kraftangriff an der beweglichen Kontaktanordnung. Somit eignet sich der Sperrhebel gemäß der Erfindung auch zur Ausübung einer Aufbruchkraft an den miteinander verschweißten Kontaktauflagen der feststehenden und der beweglichen Kontaktanordnung.The bearing point for the locking lever can be designed as a pocket-like recess in the housing of the low-voltage circuit breaker and can be located between the switching shaft and the fixed contact arrangement, preferably below the connecting line of these parts. In this area, the bearing point can be made from a molded material without additional effort during the manufacture of the housing of the circuit breaker. At the same time, the selected arrangement of the bearing point is favorable for the application of force to the movable contact arrangement. Thus, the locking lever according to the invention is also suitable for exerting an opening force on the welded contact supports of the fixed and the movable contact arrangement.

Der Sperrhebel kann durch ein im wesentlichen ebenes Formblech gebildet sein, das an seinem mit der Lagerstelle des Gehäuses zusammenwirkenden Ende und an seinem gegenüberliegenden, mit dem Antriebshebel zusammenwirkenden Ende ballige Konturen besitzt und das zur Bildung der mit der beweglichen Kontaktanordnung zusammenwirkenden Arbeitsfläche einen an seinem Ende abgewinkelten Fortsatz trägt. Zur Herstellung des Sperrhebels genügen somit einfache Stanzvorgänge.The locking lever can be formed by a substantially flat shaped plate which has convex contours at its end which cooperates with the bearing point of the housing and at its opposite end which cooperates with the drive lever and which has one end to form the working surface which cooperates with the movable contact arrangement angled extension carries. Simple punching operations are therefore sufficient to produce the locking lever.

Die Erfindung wird im folgenden anhand des in den Figuren dargestellten Ausführungsbeispiels näher erläutert.The invention is explained below with reference to the embodiment shown in the figures.

Die Figur 1 zeigt einen mehrpoligen Niederspannungs-Schutzschalter in einem Längsschnitt im Bereich des mittleren, mit dem Antriebsmechanismus versehenen Poles im ausgeschalteten, verklinkten Zustand.FIG. 1 shows a multi-pole low-voltage circuit breaker in a longitudinal section in the region of the middle pole provided with the drive mechanism in the switched-off, latched state.

Die Figuren 2 und 3 zeigen unter Weglassung aller übrigen Teile des in der Fig. 1 gezeigten Schalters nur den Antriebsmechanismus mit der Kontaktanordnung und dem Sperrhebel in der ungestörten Einschaltstellung bzw. bei dem Versuch der Ausschaltung bei gestörtem Einschaltzustand.FIGS. 2 and 3 show, with the omission of all other parts of the switch shown in FIG. 1, only the drive mechanism with the contact arrangement and the locking lever in the undisturbed switch-on position or when trying to switch it off with a faulty switch-on state.

Der in der Fig. 1 gezeigte Niederspannungs-Schutzschalter 1 gehört zur Bauart der sogenannten Kompaktschalter. Er weist ein aus isolierendem Werkstoff hergestelltes Gehäuse 2 auf, das ein Unterteil 3 und ein Oberteil 4 aufweist, die entlang einer Teilfuge 5 dicht abschließend miteinander verbunden sind. Die Strombahn des Niederspannungs-Schultzschalters 1 erstreckt sich von einer ersten Anschlußvorrichtung 6 über eine feststehende Kontaktanordnung 7 und eine bewegliche Kontaktanordnung 8 sowie über ein Stromband 9 und einen sich durch eine Auslöseeinheit 10 erstreckenden Leiter 11 zu einer weiteren Anschlußvorrichtung 12. Die feststehende Kontaktanordnung umfaßt ein an dem Unterteil 3 des Gehäuses 2 befestigtes Leiterstück 13 und eine damit verbundene Kontaktauflage 14. Diese wirkt mit einer gleichartigen Kontaktauflage 15 der beweglichen Kontaktanordnung 8 zusammen, die aus einem beweglichen Schaltstück 16 sowie einem Träger 17 besteht, der an einer in dem Gehäuse 2 drehbar gelagerten Schaltwelle 20 befestigt ist. Zwischen dem Schaltstück 16 und dem Träger 17 ist eine Kontaktkraftfeder 21 angeordnet, die im Einschaltzustand des Schutzschalters für den erforderlichen Kontaktdruck zwischen den Kontaktauflagen 14 und 15 sorgt. Zwischen dem Träger 17 und dem Schaltstück 16 besteht eine Kupplung derart, daß ausgehend von der Einschaltstellung nach einem gewissen Weg eine zwangsläufige Mitnahme des Schaltstückes erfolgt.The low-voltage circuit breaker 1 shown in FIG. 1 belongs to the type of the so-called compact switch. It has a housing 2 made of insulating material, which has a lower part 3 and an upper part 4, which are tightly connected to one another along a parting joint 5. The current path of the low-voltage Schultz switch 1 extends from a first connection device 6 via a fixed contact arrangement 7 and a movable contact arrangement 8 as well as over one Current band 9 and a conductor 11 extending through a trigger unit 10 to a further connecting device 12. The fixed contact arrangement comprises a conductor piece 13 fastened to the lower part 3 of the housing 2 and a contact pad 14 connected thereto. This acts with a similar contact pad 15 of the movable contact arrangement 8 together, which consists of a movable switching piece 16 and a carrier 17 which is fastened to a switching shaft 20 rotatably mounted in the housing 2. A contact force spring 21 is arranged between the contact piece 16 and the carrier 17 and ensures the required contact pressure between the contact pads 14 and 15 when the circuit breaker is switched on. There is a coupling between the carrier 17 and the switching element 16 in such a way that, starting from the switched-on position, the switching element is inevitably taken along in a certain way.

An dem Träger 17 greift mittels eines Gelenkstiftes 18 ein aus den Hebeln 23 bestehendes Kniehebelsystem an. Beide Hebel sind durch einen Kniegelenkbolzen 24 miteinander und durch einen weiteren Bolzen 25 mit einer um ein Lager 26 schwenkbaren Hauptklinke 27 verbunden. An dem Kniegelenkbolzen 24 greift ferner eine Antriebsfeder 30 an, deren gegenüberliegendes Ende mit dem oberen Ende eines Antriebshebels 31 verbunden ist, der um ein ortsfestes Drehlager schwenkbar ist. Die Schwenkung des Antriebshebels 31 kann von Hand durch einen auf den Antriebshebel 31 aufgesetzten Betätigungshandgriff 33 erfolgen, der durch eine Öffnung 34 des Oberteiles 4 des Gehäuses 2 herausragt.A toggle lever system consisting of the levers 23 engages on the carrier 17 by means of a joint pin 18. Both levers are connected to one another by a knee joint bolt 24 and by a further bolt 25 to a main pawl 27 which can be pivoted about a bearing 26. A drive spring 30 also acts on the knee joint pin 24, the opposite end of which is connected to the upper end of a drive lever 31 which can be pivoted about a fixed pivot bearing. The drive lever 31 can be pivoted by hand by means of an actuating handle 33 placed on the drive lever 31, which protrudes through an opening 34 in the upper part 4 of the housing 2.

Die Hauptklinke 27 stützt sich im verklinkten Zustand des Schutzschalters an einem Riegelbolzen 28 ab, wie dies näher der DE-C-28 17 667 zu entnehmen ist. Wegen der genauen Beschreibung der Verklinkungsanordnung in dieser Patentschrift wird von einer Erwähnung weiterer Einzelheiten im vorliegenden Zusammenhang abgesehen.The main pawl 27 is supported in the latched state of the circuit breaker on a locking bolt 28, as can be seen in more detail in DE-C-28 17 667. Because of the precise description of the latching arrangement in this patent specification, no further details are mentioned in the present context.

Wie die Fig. 1 ferner zeigt, enthält der Antriebsmechanismus des Niederspannungs-Schutzschalters 1 einen Sperrhebel 35, der in den Fig. 2 und 3 durch Wahl einer dickeren Strichstärke hervorgehoben ist. Der Sperrhebel 35 ist an seinem unteren Ende kreisförmig verrundet und greift mit diesem verrundeten Ende 36 in eine am Boden des Unterteiles 3 des Gehäuses 2 vorgesehene taschenartige Ausnehmung 37 ein. Das gegenüberliegende Ende 40 des Sperrhebels 35 besitzt ebenfalls ballig verrundete Flächen, die mit geraden Gegenflächen des Betätigungshandgriffes 33 zusammenwirken. In dem mittleren Bereich des Sperrhebels 35 ist durch eine Ausbuchtung 38 eine Arbeitsfläche gebildet, die im Einschaltzustand dem Kniegelenkbolzen 24 der Kniehebel 23 mit geringem Abstand gegenübersteht. Ferner weist der Sperrhebel 35 einen Fortsatz 41 mit einer Abwinklung 42 auf, die gleichfalls eine Arbeitsfläche bildet. Diese wirkt mit einer Gegenfläche des Trägers 17 des beweglichen Schaltstückes 16 zusammen.As FIG. 1 also shows, the drive mechanism of the low-voltage circuit breaker 1 contains a locking lever 35, which is highlighted in FIGS. 2 and 3 by choosing a thicker line width. The locking lever 35 is rounded at its lower end and engages with this rounded end 36 in a pocket-like recess 37 provided on the bottom of the lower part 3 of the housing 2. The opposite end 40 of the locking lever 35 also has spherically rounded surfaces which interact with straight counter surfaces of the operating handle 33. In the central area of the locking lever 35, a working surface is formed by a bulge 38, which in the switched-on state is opposite the knee joint pin 24 of the knee lever 23 at a short distance. Furthermore, the locking lever 35 has an extension 41 with an angle 42, which also forms a work surface. This interacts with a counter surface of the carrier 17 of the movable contact piece 16.

In der Fig. 2 ist der Einschaltzustand dargestellt. Der Betätigungshandgriff 33 befindet sich nahe dem linken Ende der in Fig. 1 gezeigten Ausnehmung des Oberteiles 4 des Gehäuses 2. Die Kniehebel 23 befinden sich unter dem Einfluß der Antriebsfeder 30 in einer leichten Übertotpunktstellung derart, daß die bewegliche Kontaktanordnung die Einschaltstellung einnimmt, in der die Kontaktauflagen 14 und 15 mit einer durch die Kontaktkraftfeder 21 bestimmten Kraft aufeinander liegen. Die Abwinklung 42 des Sperrhebels 35 steht dabei mit einem geringen Abstand einer Gegenfläche des Trägers 17 gegenüber.2 shows the switch-on state. The actuating handle 33 is located near the left end of the recess of the upper part 4 of the housing 2 shown in FIG. 1. The toggle levers 23 are under the influence of the drive spring 30 in a slight dead center position such that the movable contact arrangement assumes the switch-on position in which the contact pads 14 and 15 lie on one another with a force determined by the contact force spring 21. The angled portion 42 of the locking lever 35 faces a counter surface of the carrier 17 at a short distance.

Beim Ausschalten mittels des Betätigungshandgriffes 33 in Richtung des Pfeiles 43 (Fig. 3) wird der Sperrhebel 35 im gleichen Sinne mitbewegt, bis die mittlere Ausbuchtung 38 des Sperrhebels 35 gegen den Kniegelenkbolzen 24 stößt. Die Kniehebel 23 werden dadurch zum Durchknicken im Ausschaltsinn veranlaßt. Im Normalfall erfolgt nun der Abschaltvorgang, bei dem die bewegliche Kontaktanordnung 8 mit der Schaltwelle 20 im Uhrzeigersinn geschwenkt wird, bis sich die in der Fig. 1 gezeigte Stellung ergibt. Sind jedoch die Kontaktauflagen 14 und 15 miteinander verschweißt, so ergibt sich die in der Fig. 3 gezeigte Stellung der Teile. Das bewegliche Schaltstück 16 verharrt in der Einschaltstellung, in der die Kontaktauflagen 14 und 15 miteinander in Berührung stehen. Durch eine geringe weitere Bewegung des Betätigungshandgriffes 33 in Richtung des Pfeiles 43 über die Stellung hinaus, in der die Kniehebel 23 zum Einknicken gebracht werden, gelangt die Abwinklung 42 zur Anlage an den Schaltstückträger 17 und blockiert die weitere Schwenkung des Antriebshebels 31. Durch Druck auf den Betätigungshandgriff 33 läßt sich jedoch durch Hebelwirkung um das Lager des unteren Endes 36 des Sperrhebels 35 eine Kraftwirkung auf den Träger 17 ausüben, die in manchen Fällen zur Trennung der miteinander verschweißten Kontaktauflagen 14 und 15 ausreicht. Wie die Fig. 3 zeigt, bleibt bei diesem Vorgang die Verriegelung des Schaltschlosses erhalten, d. h., die Hauptklinke 27 wird durch den Riegelbolzen 28 festgehalten.When switching off by means of the actuating handle 33 in the direction of arrow 43 (FIG. 3), the locking lever 35 is moved in the same sense until the central bulge 38 of the locking lever 35 abuts the knee joint pin 24. The toggle levers 23 are thereby caused to buckle in the direction of opening. In the normal case, the switch-off process now takes place, in which the movable contact arrangement 8 with the control shaft 20 is pivoted clockwise until the position shown in FIG. 1 is obtained. However, if the contact pads 14 and 15 are welded together, the position of the parts shown in FIG. 3 results. The movable contact piece 16 remains in the switched-on position in which the contact pads 14 and 15 are in contact with one another. By a slight further movement of the operating handle 33 in the direction of arrow 43 beyond the position in which the toggle levers 23 are caused to buckle, the bend 42 comes to rest against the contact piece carrier 17 and blocks the further pivoting of the drive lever 31 the actuating handle 33 can, however, exert a force on the carrier 17 by lever action around the bearing of the lower end 36 of the locking lever 35, which in some cases is sufficient to separate the welded contact pads 14 and 15. As shown in Fig. 3, the lock of the key switch is retained in this process, i. that is, the main pawl 27 is held by the locking bolt 28.

Zur Anwendung des Sperrhebels 35 ist es lediglich erforderlich, daß das Unterteil 3 des Gehäuses 2 die beschriebene Lageröffnung (Ausnehmung 37) besitzt. Die übrigen mit dem Sperrhebel zusammenwirkenden Teile bzw. Flächen sind in dem Schaltermechanismus ohnehin vorhanden. Soll daher ein Schutzschalter mit einem Sperrhebel ausgestattet werden, so wird dieser bei der Montage der Schalterteile mit seinem Ende 36 in die Ausnehmung 37 eingeführt, wobei er durch zweckmäßige Positionierung mit seinem oberen Ende 40 zur Anlage an Flächen des Betätigungshandgriffes 33 und mit seiner Abwinklung 42 in die Nähe des Trägers 17 gelangt.To use the locking lever 35, it is only necessary that the lower part 3 of the housing 2 has the described bearing opening (recess 37). The other parts or surfaces interacting with the locking lever are present in the switch mechanism anyway. Therefore, if a circuit breaker is to be equipped with a locking lever, this is inserted with its end 36 into the recess 37 during the assembly of the switch parts, whereby it is positioned appropriately with its upper end 40 for bearing against surfaces of the actuating handle 33 and with its angled portion 42 comes near the carrier 17.

In dem beschriebenen Ausführungsbeispiel ist der Sperrhebel 35 an seinem unteren Ende mit einer durchgehenden Rundung entsprechend einem Kreisbogen versehen. Statt dessen kann der Sperrhebel auch mit drei balligen Flächen versehen werden, die Abschnitte dieses Kreisbogens bilden, weil der geringe Schwenkwinkel des Sperrhebels 35 eine durchgehende Rundung nicht unbedingt erfordert. Die Angriffsstelle der Abwinklung 42 an dem Träger 17 läßt sich durch unterschiedliche Form des Fortsatzes des Sperrhebels variieren, um eine kleinere oder größere Aufbrechkraft auf das bewegliche Schaltstück auszuüben. Ebenso unterliegt die Anordnung der Lagerstelle (Ausnehmung 37) Erwägungen darüber, wie groß die gewünschte Aufbrechkraft sein soll oder wie sich die Lagerstelle am besten in dem Gehäuse anordnen läßt. In dem beschriebenen Ausführungsbeispiel befindet sich die Lagerstelle (Ausnehmung 37) an der tiefsten Stelle des Unterteiles 3 des Gehäuses 2 unterhalb der Verbindungslinie der Schaltwelle und des feststehenden Schaltstückes 7. Die beschriebenen Kniehebel und auch der Sperrhebel können zur Vergleichmäßigung des Kraftangriffes paarig vorhanden sein. Das gleiche gilt für weitere Elemente des Schalters, z. B. die Federn.In the described embodiment the locking lever 35 is provided at its lower end with a continuous rounding corresponding to an arc. Instead, the locking lever can also be provided with three spherical surfaces, which form sections of this circular arc, because the small pivoting angle of the locking lever 35 does not necessarily require a continuous rounding. The point of attack of the bend 42 on the carrier 17 can be varied by different shape of the extension of the locking lever in order to exert a smaller or greater breaking force on the movable contact piece. The arrangement of the bearing point (recess 37) is also subject to considerations of how great the desired breaking force should be or how the bearing point can best be arranged in the housing. In the exemplary embodiment described, the bearing point (recess 37) is located at the deepest point of the lower part 3 of the housing 2 below the connecting line of the selector shaft and the fixed switching element 7. The toggle levers described and also the locking lever can be present in pairs to even out the force application. The same applies to other elements of the switch, e.g. B. the feathers.

Claims (4)

1. A low-voltage protective switch (1) having a housing (2) and at least one stationary (7) and one movable contact arrangement (8) which comprises a carrier (17) seated on a switching shaft (20) and a movable switching element (16) which is secured to said carrier by the interposition of a contact spring (21), and which contact arrangement can be switched on and off by an operating handle (33), an actuating lever (31), an actuating spring (30) and a toggle system (23) which acts upon the carrier (17), as well as having a locking lever (35) against transfer of the actuating lever (33) into the off-position during blocking of the movable switching element (16) in the on-position, characterised in that the locking lever (35) is seated in a bearing (37), which is formed in the housing (2), and has its end (40), which lies opposite the bearing (37), connected to the operating handle (33), where in the undisturbed on-position, a workin'g surface (42) of the locking lever (35) is opposite a counter surface of the movable contact arrangement (8) at a distance which corresponds to an only partial movement of the operating handle (33) in the direction of its off-position, and a further working surface (38) is arranged opposite the toggle joint pin (24) of the toggle system (23).
2. A low-voltage protective switch according to Claim 1, characterised in that the bearing (37) for the locking lever (35) is in the form of a pocket- shaped recess in the housing (2) of the low-voltage protective switch (1) and is located between the switching shaft (20) and the stationary contact arrangement (7), preferably below the line connecting these components.
3. A low-voltage protective switch according to Claim 1, characterised in that the locking iever (35) is formed by an esentially flat shaped plate which at its end (36) co-operating with the bearing (37) of the housing (2) and at its opposite end (40) co-operating with the actuating lever (31), has convex contours and is furnished with an extension, which is provided with an angled portion for forming the working surface (42) which co-operates with the movable contact arrangement (8).
4. A low-voltage protective switch according to Claim 1, characterised in that the locking lever (35) has a region which co-operates with the toggle joint pin (24) of the toggle system (23) during switch-off, and which acts before the impact of the angled portion on the counter surface of the movable contact arrangement (8).
EP81730070A 1980-08-29 1981-08-06 Low-voltage protective circuit breaker with blocking lever Expired EP0047220B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81730070T ATE10555T1 (en) 1980-08-29 1981-08-06 LOW VOLTAGE CIRCUIT BREAKER WITH LOCKING LEVER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8023509U 1980-08-29
DE8023509U DE8023509U1 (en) 1980-08-29 1980-08-29 Low voltage circuit breaker for locking lever

Publications (3)

Publication Number Publication Date
EP0047220A2 EP0047220A2 (en) 1982-03-10
EP0047220A3 EP0047220A3 (en) 1982-09-22
EP0047220B1 true EP0047220B1 (en) 1984-11-28

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ID=6718523

Family Applications (1)

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EP81730070A Expired EP0047220B1 (en) 1980-08-29 1981-08-06 Low-voltage protective circuit breaker with blocking lever

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US (1) US4368444A (en)
EP (1) EP0047220B1 (en)
JP (1) JPS5770645U (en)
AT (1) ATE10555T1 (en)
DE (1) DE8023509U1 (en)

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Also Published As

Publication number Publication date
JPS5770645U (en) 1982-04-28
DE8023509U1 (en) 1980-11-27
US4368444A (en) 1983-01-11
EP0047220A2 (en) 1982-03-10
EP0047220A3 (en) 1982-09-22
ATE10555T1 (en) 1984-12-15

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