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EP0047221B1 - 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
EP0047221B1
EP0047221B1 EP81730071A EP81730071A EP0047221B1 EP 0047221 B1 EP0047221 B1 EP 0047221B1 EP 81730071 A EP81730071 A EP 81730071A EP 81730071 A EP81730071 A EP 81730071A EP 0047221 B1 EP0047221 B1 EP 0047221B1
Authority
EP
European Patent Office
Prior art keywords
lever
locking lever
low
toggle
locking
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
EP81730071A
Other languages
German (de)
French (fr)
Other versions
EP0047221A2 (en
EP0047221A3 (en
Inventor
Werner Troebel
Martin Böttcher
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to AT81730071T priority Critical patent/ATE10688T1/en
Publication of EP0047221A2 publication Critical patent/EP0047221A2/en
Publication of EP0047221A3 publication Critical patent/EP0047221A3/en
Application granted granted Critical
Publication of EP0047221B1 publication Critical patent/EP0047221B1/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
    • H01H71/52—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

Definitions

  • the invention relates to a low-voltage circuit breaker with a drive lever which can be moved by an actuating handle and which acts on a selector shaft provided with movable contact pieces by means of a drive spring and two toggle levers connected by a knee joint, and with a locking lever seated on the selector shaft to prevent the actuating handle from being transferred into the switch-off position with movable contact blocks blocked in the switch-on position.
  • a circuit breaker of this type is known from DE-A-2508220.
  • the locking lever is firmly connected to the selector shaft and interacts with a swivel-mounted stop in such a way that the drive lever and thus the operating handle sitting on it are locked against being transferred to the switch-off position when the movable switch pieces in the switch-on position e.g. are blocked by welding with the associated fixed contact pieces. If, on the other hand, there is a normal shutdown, the associated rotation of the selector shaft and a corresponding pivoting of the locking lever raise the stop and release the drive lever. In both cases, the latching of the switching mechanism is first released by a trigger member connected to the drive lever.
  • Another known device for locking the drive lever in the case of blocked contact pieces has a two-armed, on the knee joint of the toggle lever locking lever, one arm engages in the windings of a drive spring of the toggle lever and the other lever arm cooperates with the hinge pin, which one of the toggle lever with Carrier of the movable contact piece connects.
  • the invention has for its object to achieve a safe limitation of the travel of the drive lever with blocked switching pieces and the transmission of a high breaking force with a simple structure using a locking lever seated on the shift shaft.
  • this object is achieved in a low-voltage circuit breaker of the type mentioned at the outset in that the locking lever is pivotably mounted on the control shaft relative to the latter, and the knee joint of the toggle lever and a working surface of the drive lever with one only partial movement of the drive lever in the direction the game corresponding to the switch-off position overlaps.
  • the forces occurring during the attempt to switch off with blocked switching pieces are absorbed by the locking lever itself, which is supported on the switching shaft.
  • a design of the locking lever is particularly favorable in such a way that it acts on the knee joint with a force acting both in the opening direction of the knee joint and in the direction of the abutment of the toggle lever facing away from the movable switching element.
  • This design of the locking lever which can be achieved by the curved shape of the surface of one fork arm cooperating with the knee joint, allows high breaking forces which are not limited by a pretension of the switching mechanism by the drive spring.
  • the mentioned points of attack of the locking lever on the switching mechanism are usually not in one plane.
  • the locking lever can obtain a shape suitable for interacting with these points of attack in that it has an angled or bent fork arm at its end for bearing against the working surface of the drive lever and an equally designed further fork arm for bearing against the knee joint bolt forming the knee joint.
  • the length of the fork arms depends not only on the length required to obtain the bends or offsets mentioned, but also whether a space must be maintained for the movement of any other components of the switching mechanism or for optional accessories for the circuit breaker.
  • the play between the fork arms of the locking lever and the counter surfaces of the drive lever and the knee joint can be selected to be relatively large in the switched-on state compared to the state of the contact contact. This ensures an unhindered switch-on and prevents damage to the knee-joint-side drainage surface of the locking lever.
  • the switching shafts of the circuit breakers are usually designed with a polygonal profile, in particular square, and consist of a metal core and a covering made of insulating material.
  • the locking lever can be mounted on a multi-edged control shaft of this type by means of a bearing body which has a cylindrical outer surface.
  • the locking lever can be supported against tilting and / or lateral displacement. It is thereby achieved that the fork arms of the locking lever are always aligned with the counter surfaces of the knee joint and the drive lever and so that the necessary interaction is ensured.
  • a single locking lever can be used, even if the drive lever is paired, i.e. is designed as a double lever.
  • the forces that occur are even more manageable if, in conjunction with the paired drive levers, two mirror-image locking levers are provided, each with its own mounting and support.
  • the locking lever is even cheaper to design the locking lever as a double lever with two mirror-image legs and a web connecting them. This eliminates the risk of canting and the bearing of the locking lever on the selector shaft is less expensive.
  • FIG. 1 shows a low-voltage circuit breaker of the compact type in a longitudinal section in the region of the central pole which has the drive mechanism.
  • a selector shaft is shown as an assembly with attached carriers of movable contact pieces and a locking lever in two different views.
  • FIG. 6 shows a side view of a further locking lever with differently shaped fork arms.
  • the low-voltage circuit breaker 1 shown in section in FIG. 1 belongs to the design of the so-called compact switch. Accordingly, it has a housing 2 made of insulating material, which is divided along a joint 3 into a lower part 4 and an upper part 5. An actuation handle 6 protrudes from an opening of the upper part 5 and is used to switch the low-voltage circuit breaker 1 on and off by hand. A drive lever 7, which is pivotable about a fixed abutment 10, is used to transmit the movement. A main pawl 12 is pivotable about a further fixed bearing 11, which is supported in the switched-on state shown with a nose 13 on a locking tab 14.
  • the locking tab 14 can be released by a trigger shaft 15, which in turn can be rotated by a thermal and / or a magnetic trigger.
  • a trigger shaft and other parts of a trigger contains e.g. DE-C-2812320.
  • a toggle lever system is supported on the main pawl 12, the toggle levers 16 and 17 of which are connected to one another by a knee joint pin 20 and to a contact carrier 22 by a further hinge pin 21. This is attached to a control shaft 23 which is rotatably mounted in the lower part 4 of the housing 2.
  • the movable contact piece 24 is opposite a fixed contact piece 26, which is also provided with a contact pad 27.
  • the current path of the low-voltage circuit breaker 1 comprises, in addition to the switching elements mentioned, a connecting device 30 connected to the fixed switching element 26 and a further connecting device 31 on the opposite end face of the housing 2, which connects to the movable switching element 24 by means of a flexible conductor 32 and one by the trigger leading heating conductor 33 is connected.
  • the toggle levers 16 and 17 assume their extended position under the action of a drive spring 34 which is suspended between the upper end of the drive lever 7 and the knee joint pin 20. If the actuating handle 6 is moved in the direction of the arrow 35, the toggle levers bend when the main pawl 12 is in the unchanged position, as a result of which the contact carrier 22 with the switching shaft 23 is pivoted counterclockwise and the movable contact piece 24 is thereby lifted off the fixed contact piece 26. A resulting switching arc is extinguished in the quenching chamber 37 provided with quenching plates 36.
  • the low-voltage circuit breaker 1 is provided with a device which prevents the actuating handle 6 from being moved into the switch-off position in the direction of arrow 35 despite the blocking of the movable contact piece, and from being able to be locked there.
  • An essential component of this protective device is a locking lever 40 which is arranged on the selector shaft 23 and is pivotably mounted relative to the latter.
  • a fork arm 41 of the locking lever 40 interacts with a working surface 42 of the drive lever 7, while another fork arm 43 interacts with the knee joint pin 20 of the toggle levers 16 and 17.
  • the locking lever 40 engages over the knee joint of the knee lever 16 and 17 and the drive lever 7 with a certain amount of play, which is shown in FIG. 1 between the knee joint pin 20 and the fork arm 43. If the attempt is made to switch off the low-voltage circuit breaker 1 when the movable switching element 24 is blocked, the blocking lever 40 with its fork arm 41 is first carried along over the working surface 42 of the drive lever 7 until the other fork arm 43 lies against the knee joint bolt 20. With a certain amount of force on the operating handle 6, the toggle levers 16 and 17 bend in the switch-off direction. A further movement of the drive lever 7 is not possible. Therefore, the operating handle 6 can not be moved to its normal switch-off position, but only about half way.
  • the design of the fork arm 43 of the locking lever 40 ensures that all operational movements within the low-voltage circuit breaker 1 are not hindered or that annoying wear and tear occurs.
  • the surface of the fork arm 43 opposite the knee joint pin 20 is shaped for this purpose so that when switched on, in the state of contact contact, there is still minimal play between the knee joint and the working surface of the drive lever on the one hand and the fork arms 41 and 43 on the other hand.
  • the forces occurring during the attempt to switch off with blocked contact pieces are essentially absorbed by the locking lever 40 itself, so that its bearing on the switching shaft 23 is subjected to pressure.
  • This can therefore be formed by a suitable plastic bearing body which has an opening adapted to the profile of the selector shaft on the inside and a cylindrical bearing surface for the locking lever 40 on the outside.
  • This bearing body can also limit the axial play.
  • the shape of the locking lever 40 means that not only a force for opening the toggle lever system, but also a force for separating welded contact pieces can be applied, which is not limited by the pretensioning forces present in the switching mechanism.
  • the fork arm 43 of the locking lever 40 engages with its surface 48 on the knee joint pin 20 with two components of the force that act differently. One component acts in the direction of the knee levers 16 and 17 buckling and thereby unlocks the movable switching element.
  • the other component acts in the direction of the abutment (pin 18) of the toggle lever 16 on the main pawl 12.
  • a breaking force can be exerted on the movable switching element 24 which is caused by the kinking of the toggle levers 16 and 17 .
  • This breaking force is based on the bolt 18 on the main pawl 12, which in turn rests on the locking tab 14.
  • the selector shaft 50 consists of a metal core and an encapsulation made of an insulating plastic. On this shaft with a square profile, three contact piece carriers 51 are fastened side by side, which have a U-shaped part 52 and arms 53 extending from the legs.
  • the control shaft 50 extends through the legs of the U-shaped part 52.
  • a bracket 54 encompassing the control shaft is riveted to the U-shaped part 52 and establishes a rigid connection between the control shaft 50 and the contact piece carrier 51.
  • each of the legs 57 and 60 of the locking lever 56 is provided with an opening which is mounted on a further bearing body 61 seated on the selector shaft 50.
  • the bearing bodies 55 which are required anyway can also be used, provided that they are provided with a corresponding extension in the direction of the legs 57 and 60.
  • FIGS. 4 and 5 Further details of the locking lever 56 can be seen in FIGS. 4 and 5, in which the locking lever is shown enlarged compared to FIGS. 2 and 3.
  • the locking lever 56 is designed as a cast part, so that the two legs 57 and 60 form a coherent component with a connecting web 62.
  • the legs 57 and 60 are mirror images and each have two fork arms 63 and 64. These have a high degree of rigidity against spreading due to the forces in the form of the permissible hand force to handle, as can occur when trying to switch off with blocked contact pieces.
  • a reinforcing rib 65 is provided on each of the two legs, which together with the outer wall of the legs form a U-shaped profile.
  • a curved region 66 is provided near the end of the fork arm 63 which is connected to the knee joint, i.e. usually cooperates with the knee joint bolt of the switching mechanism.
  • the curve shape of this area is selected such that there is minimal play when switching on at the point of contact and in the fully switched-on state there is a slightly larger play according to FIG. 1.
  • the opposite fork arm 64 has at its end a curved surface 67 for abutting the drive lever 7 in Fig. 1.
  • An angled or cranked shape of the fork arms 63 and 64 ensures that the ends of the fork arms are in the correct position with respect to the counter surfaces of the Switch mechanism received.
  • the surfaces 67 are provided on the sides of the legs facing away from one another, while the curved regions 66 are arranged on the sides of the legs facing one another (FIGS. 3 and 4).
  • the legs of the double or paired drive lever 7 are parallel to the legs 57 and 60 of the locking lever 56 on the outside thereof.
  • the cranking or angling of the fork arms 64 to the outside is not required if the drive lever 7 (FIG. 1) has a corresponding bulge, a shoulder or the like.
  • the bearing body 61 has the shape of a bush, which is adapted to the square profile of the selector shaft 50 on the inside and, like the bearing body 55, is displaceable on the selector shaft. Outside, the bearing bodies 61 have a cylindrical bearing surface for the inner opening 68 of the locking lever 56. A collar 69 for limiting the axial displaceability of the locking lever 56 can be part of the bearing body 61 or - as FIGS. 4 and 5 show - part of the locking lever 56.
  • a locking lever 70 also designed as a cast part, is shown in FIG. 6.
  • the only difference from the locking lever 56 is the shape of the fork arms 71 and 72, which is adapted to the different shape and movement of the switching mechanism of another circuit breaker.
  • the locking lever 70 is also formed as a double lever with mirror-image legs and a connecting web 73.
  • locking levers 56 and 70 as castings, e.g. As die cast parts, locking levers with the same function can also be produced from sheet metal by punching and bending. Instead of double levers, single levers or two individual levers can also be used, which can be produced in any suitable manner. Lateral displacement and / or tilting can be prevented by the bearing body or additional separate parts. With the double levers described there is no risk of canting, so that it is only necessary to limit the lateral displacement.

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  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

A low-voltage circuit breaker has a locking lever to prevent transfer of the circuit breaker handle entirely into its "off" position if the movable contact is blocked in its "on" position by being welded to the fixed contact. The locking lever is rotatably mounted on the control shaft, which is pivotally moved by a drive lever which is connected to the control shaft by a toggle lever system including two toggle levers and a toggle hinge pin joining them together. The fork arms embrace a working surface on the drive lever and the toggle hinge pin. The working surface and the hinge pin are spaced closer together than the arms when the circuit breaker handle is in its "on" position to allow only partial movement of the handle toward its "off" position unless the movable contact is free to move to its "off" position before the locking lever pivots to a position in which it engages both the working surface and the toggle hinge pin. The locking lever can be formed as a double lever with a connecting web.

Description

Die Erfindung befasst sich mit einem Niederspannungs-Schutzschalter mit einem durch einen Betätigungshandgriff bewegbaren Antriebshebel, der mittels einer Antriebsfeder und zweier durch ein Kniegelenk verbundener Kniehebel auf eine mit bewegbaren Schaltstücken versehene Schaltwelle einwirkt, sowie mit einem auf der Schaltwelle sitzenden Sperrhebel gegen Überführung des Betätigungshandgriffes in die Ausschaltstellung bei in der Einschaltstellung blockierten bewegbaren Schaltstücken.The invention relates to a low-voltage circuit breaker with a drive lever which can be moved by an actuating handle and which acts on a selector shaft provided with movable contact pieces by means of a drive spring and two toggle levers connected by a knee joint, and with a locking lever seated on the selector shaft to prevent the actuating handle from being transferred into the switch-off position with movable contact blocks blocked in the switch-on position.

Ein Schutzschalter dieser Art ist durch die DE-A-2508220 bekannt geworden. Der Sperrhebel ist dabei fest mit der Schaltwelle verbunden und wirkt mit einem schwenkbar gelagerten Anschlag derart zusammen, dass der Antriebshebel und damit der auf ihm sitzende Betätigungshandgriff gegen eine Überführung in die Ausschaltstellung gesperrt wird, wenn die beweglichen Schaltstükke in der Einschaltstellung z.B. durch eine Verschweissung mit den zugehörigen feststehenden Schaltstücken blockiert sind. Erfolgt dagegen eine normale Abschaltung, so wird durch die damit verbundene Drehung der Schaltwelle und eine entsprechende Schwenkung des Sperrhebels der Anschlag angehoben und der Antriebshebel freigegeben. In beiden Fällen wird durch ein mit dem Antriebshebel verbundenes Auslöseglied zunächst die Verklinkung des Schaltmechanismus gelöst.A circuit breaker of this type is known from DE-A-2508220. The locking lever is firmly connected to the selector shaft and interacts with a swivel-mounted stop in such a way that the drive lever and thus the operating handle sitting on it are locked against being transferred to the switch-off position when the movable switch pieces in the switch-on position e.g. are blocked by welding with the associated fixed contact pieces. If, on the other hand, there is a normal shutdown, the associated rotation of the selector shaft and a corresponding pivoting of the locking lever raise the stop and release the drive lever. In both cases, the latching of the switching mechanism is first released by a trigger member connected to the drive lever.

Eine andere bekannte Einrichtung zur Sperrung des Antriebshebels bei blockierten Schaltstücken weist einen zweiarmigen, auf dem Kniegelenk der Kniehebel gelagerten Sperrhebel auf, dessen einer Arm in die Windungen einer Antriebsfeder der Kniehebel eingreift und dessen anderer Hebelarm mit dem Gelenkbolzen zusammenwirkt, der einen der Kniehebel mit dem Träger des beweglichen Schaltstückes verbindet. Bei dieser Anordnung werden beim Ausschalten des Schalters von Hand zunächst stets die Kniehebel in Ausschaltrichtung durchgeknickt, bevor die Angriffsrichtung der Antriebsfeder die Totpunktlage erreicht. Im Normalfall erfolgt dann die vollständige Öffnung der beweglichen Schaltstücke in der üblichen Weise. Sind jedoch die Schaltstücke blockiert, so lässt sich der Antriebshebel nicht weiter in der Richtung der Ausschaltstellung schwenken, weil sich der eine Hebelarm des Sperrhebels an dem in der Schliessstellung verharrenden beweglichen Schaltstück abstützt (US-A-4165453).Another known device for locking the drive lever in the case of blocked contact pieces has a two-armed, on the knee joint of the toggle lever locking lever, one arm engages in the windings of a drive spring of the toggle lever and the other lever arm cooperates with the hinge pin, which one of the toggle lever with Carrier of the movable contact piece connects. With this arrangement, when the switch is switched off manually, the toggle levers are always first bent in the switch-off direction before the direction of engagement of the drive spring reaches the dead center position. In the normal case, the movable contact pieces are then fully opened in the usual way. However, if the contact pieces are blocked, the drive lever cannot be pivoted any further in the direction of the switch-off position, because the one lever arm of the locking lever is supported on the movable contact piece which remains in the closed position (US-A-4165453).

Der Erfindung liegt die Aufgabe zugrunde, unter Verwendung eines auf der Schaltwelle sitzenden Sperrhebels eine sichere Begrenzung des Weges des Antriebshebels bei blockierten Schaltstücken und die Übertragung einer hohen Aufbrechkraft bei einfachem Aufbau zu erreichen.The invention has for its object to achieve a safe limitation of the travel of the drive lever with blocked switching pieces and the transmission of a high breaking force with a simple structure using a locking lever seated on the shift shaft.

Gemäss der Erfindung wird diese Aufgabe bei einem Niederspannungs-Schutzschalter der eingangs genannten Art dadurch gelöst, dass der Sperrhebel auf der Schaltwelle relativ zu dieser schwenkbar gelagert ist und das Kniegelenk der Kniehebel sowie eine Arbeitsfläche des Antriebshebels mit einem einer nur teilweisen Bewegung des Antriebshebels in Richtung der Ausschaltstellung entsprechenden Spiel gabelartig übergreift. Bei dieser Anordnung werden die beim Ausschaltversuch mit blockierten Schaltstücken auftretenden Kräfte von dem Sperrhebel selbst aufgenommen, der sich auf der Schaltwelle abstützt. Besonders günstig ist eine Ausführung des Sperrhebels derart, dass er an dem Kniegelenk mit einer sowohl in Öffnungsrichtung des Kniegelenks als auch in Richtung des dem bewegbaren Schaltstück abgewandten Widerlagers der Kniehebel wirkenden Kraft angreift. Diese Ausführung des Sperrhebels, die durch die Kurvenform der mit dem Kniegelenk zusammenwirkenden Fläche des einen Gabelarmes erzielbar ist, erlaubt hohe Aufbrechkräfte, die nicht durch eine Vorspannung des Schaltmechanismus durch die Antriebsfeder begrenzt sind.According to the invention, this object is achieved in a low-voltage circuit breaker of the type mentioned at the outset in that the locking lever is pivotably mounted on the control shaft relative to the latter, and the knee joint of the toggle lever and a working surface of the drive lever with one only partial movement of the drive lever in the direction the game corresponding to the switch-off position overlaps. In this arrangement, the forces occurring during the attempt to switch off with blocked switching pieces are absorbed by the locking lever itself, which is supported on the switching shaft. A design of the locking lever is particularly favorable in such a way that it acts on the knee joint with a force acting both in the opening direction of the knee joint and in the direction of the abutment of the toggle lever facing away from the movable switching element. This design of the locking lever, which can be achieved by the curved shape of the surface of one fork arm cooperating with the knee joint, allows high breaking forces which are not limited by a pretension of the switching mechanism by the drive spring.

Die erwähnten Angriffstellen des Sperrhebels an dem Schaltmechanismus liegen in der Regel nicht in einer Ebene. Eine für das Zusammenwirken mit diesen Angriffsstellen geeignete Gestalt kann der Sperrhebel jedoch dadurch erhalten, dass er einen an seinem Ende abgewinkelten oder abgekröpften Gabelarm zur Anlage an der Arbeitsfläche des Antriebshebels und einen ebenso ausgebildeten weiteren Gabelarm zur Anlage an dem das Kniegelenk bildenden Kniegelenkbolzen besitzt. Die Länge der Gabelarme richtet sich dabei neben der zur Erlangung der erwähnten Abwinklungen oder Abkröpfungen benötigten Länge auch danach, ob ein Freiraum für die Bewegung eventueller weiterer vorhandener Komponenten des Schaltmechanismus oder für wahlweise zu verwendendes Zubehör des Schutzschalters aufrechterhalten werden muss.The mentioned points of attack of the locking lever on the switching mechanism are usually not in one plane. However, the locking lever can obtain a shape suitable for interacting with these points of attack in that it has an angled or bent fork arm at its end for bearing against the working surface of the drive lever and an equally designed further fork arm for bearing against the knee joint bolt forming the knee joint. The length of the fork arms depends not only on the length required to obtain the bends or offsets mentioned, but also whether a space must be maintained for the movement of any other components of the switching mechanism or for optional accessories for the circuit breaker.

Anstelle einer Abwinklung oder Abkröpfung des einen Gabelarmes kann eine entsprechende Gestaltung des Antriebshebels vorgesehen sein.Instead of angling or bending the one fork arm, a corresponding design of the drive lever can be provided.

Das Spiel zwischen den Gabelarmen des Sperrhebels und den Gegenflächen des Antriebshebels und des Kniegelenks kann im Einschaltzustand relativ gross gegenüber dem Zustand der Kontaktberührung gewählt sein. Dadurch wird ein ungehindertes Einschalten sichergestellt und eine Beschädigung der kniegelenkseitigen Ablauffläche des Sperrhebels vermieden.The play between the fork arms of the locking lever and the counter surfaces of the drive lever and the knee joint can be selected to be relatively large in the switched-on state compared to the state of the contact contact. This ensures an unhindered switch-on and prevents damage to the knee-joint-side drainage surface of the locking lever.

Die Schaltwellen der Schutzschalter sind üblicherweise mit mehrkantigem Profil, insbesondere vierkantig ausgebildet und bestehen aus einem Metallkern und einer Umhüllung aus Isolierstoff. Auf einer mehrkantig ausgebildeten Schaltwelle dieser Art kann der Sperrhebel mittels eines Lagerkörpers gelagert sein, der eine zylindrische Aussenfläche aufweist. Zusätzlich kann der Sperrhebel gegen Verkantung und/oder seitliche Verschiebung abgestützt sein. Dadurch wird erreicht, dass die Gabelarme des Sperrhebels stets auf die Gegenflächen des Kniegelenks und des Antriebshebels ausgerichtet sind und damit das erforderliche Zusammenwirken sichergestellt ist.The switching shafts of the circuit breakers are usually designed with a polygonal profile, in particular square, and consist of a metal core and a covering made of insulating material. The locking lever can be mounted on a multi-edged control shaft of this type by means of a bearing body which has a cylindrical outer surface. In addition, the locking lever can be supported against tilting and / or lateral displacement. It is thereby achieved that the fork arms of the locking lever are always aligned with the counter surfaces of the knee joint and the drive lever and so that the necessary interaction is ensured.

Im Prinzip kann ein einzelner Sperrhebel verwendet werden, auch wenn der Antriebshebel paarig, d.h. als Doppelhebel, ausgebildet ist. Die auftretenden Kräfte sind jedoch noch besser beherrschbar, wenn in Verbindung mit dem paarig ausgebildeten Antriebshebel zwei spiegelbildlich ausgebildete Sperrhebel mit jeweils eigener Lagerung und Abstützung vorgesehen sind.In principle, a single locking lever can be used, even if the drive lever is paired, i.e. is designed as a double lever. However, the forces that occur are even more manageable if, in conjunction with the paired drive levers, two mirror-image locking levers are provided, each with its own mounting and support.

Noch günstiger ist es, den Sperrhebel als Doppelhebel mit zwei spiegelbildlich gestalteten Schenkeln und einem diese verbindenden Steg auszubilden. Dabei entfällt die Gefahr einer Verkantung und die Lagerung des Sperrhebels auf der Schaltwelle wird günstiger beansprucht.It is even cheaper to design the locking lever as a double lever with two mirror-image legs and a web connecting them. This eliminates the risk of canting and the bearing of the locking lever on the selector shaft is less expensive.

Die Erfindung wird im folgenden anhand der in den Figuren dargestellten Ausführungsbeispiele näher erläutert.The invention is explained in more detail below with reference to the exemplary embodiments shown in the figures.

Die Fig. 1 zeigt einen Niederspannungs-Schutzschalter der Kompaktbauart in einem Längsschnitt im Bereich des mittleren, den Antriebsmechanismus aufweisenden Poles.1 shows a low-voltage circuit breaker of the compact type in a longitudinal section in the region of the central pole which has the drive mechanism.

In den Fig. 2 und 3 ist eine Schaltwelle als Baugruppe mit daran befestigten Trägern beweglicher Schaltstücke sowie einem Sperrhebel in zwei verschiedenen Ansichten gezeigt.2 and 3, a selector shaft is shown as an assembly with attached carriers of movable contact pieces and a locking lever in two different views.

Die Fig. 4 und 5 zeigen in zwei Ansichten einen als Gussteil ausgebildeten Sperrhebel.4 and 5 show in two views a locking lever designed as a cast part.

Die Fig. 6 zeigt eine Seitenansicht eines weiteren Sperrhebels mit anders geformten Gabelarmen.6 shows a side view of a further locking lever with differently shaped fork arms.

Der in der Fig. 1 im Schnitt gezeigte Niederspannungs-Schutzschalter 1 gehört zur Bauform der sogenannten Kompaktschalter. Er weist dementsprechend ein aus Isolierstoff hergestelltes Gehäuse 2 auf, das entlang einer Teilfuge 3 in ein Unterteil 4 und ein Oberteil 5 geteilt ist. Aus einer Öffnung des Oberteiles 5 ragt ein Betätigungshandgriff 6 heraus, der zum Ein- und Ausschalten des Niederspannungs-Schutzschalters 1 von Hand dient. Zur Übertragung der Bewegung dient ein Antriebshebel 7, der um ein ortsfestes Widerlager 10 schwenkbar ist. Um ein weiteres ortsfestes Lager 11 ist ein Hauptklinke 12 schwenkbar, die sich in dem dargestellten Einschaltzustand mit einer Nase 13 an einer Sperrlasche 14 abstützt. In bekannter Weise ist die Sperrlasche 14 durch eine Auslösewelle 15 freigebbar, die ihrerseits durch einen thermischen und/oder einen magnetischen Auslöser drehbar ist. Eine nähere Beschreibung einer Auslösewelle und weiterer Teile eines Auslösers enthält z.B. die DE-C-2812320.The low-voltage circuit breaker 1 shown in section in FIG. 1 belongs to the design of the so-called compact switch. Accordingly, it has a housing 2 made of insulating material, which is divided along a joint 3 into a lower part 4 and an upper part 5. An actuation handle 6 protrudes from an opening of the upper part 5 and is used to switch the low-voltage circuit breaker 1 on and off by hand. A drive lever 7, which is pivotable about a fixed abutment 10, is used to transmit the movement. A main pawl 12 is pivotable about a further fixed bearing 11, which is supported in the switched-on state shown with a nose 13 on a locking tab 14. In a known manner, the locking tab 14 can be released by a trigger shaft 15, which in turn can be rotated by a thermal and / or a magnetic trigger. A more detailed description of a trigger shaft and other parts of a trigger contains e.g. DE-C-2812320.

An der Hauptklinke 12 stützt sich ein Kniehebelsystem ab, dessen Kniehebel 16 und 17 durch einen Kniegelenkbolzen 20 miteinander und durch einen weiteren Gelenkbolzen 21 mit einem Kontaktträger 22 verbunden sind. Dieser ist auf einer Schaltwelle 23 befestigt, die in dem Unterteil 4 des Gehäuses 2 drehbar gelagert ist. An dem Kontaktträger 22 ist unter Zwischenschaltung nicht dargestellter Kontaktkraftfedern ein bewegliches Schaltstück 24 angebracht, das mit einer Kontaktauflage 25 versehen ist. Dem beweglichen Schaltstück 24 steht ein feststehendes Schaltstück 26 gegenüber, das gleichfalls mit einer Kontaktauflage 27 versehen ist. Die Strombahn des Niederspannungs-Schutzschalters 1 umfasst neben den erwähnten Schaltstücken eine mit dem feststehenden Schaltstück 26 verbundene Anschlussvorrichtung 30 sowie eine weitere Anschlussvorrichtung 31 an der gegenüberliegenden Stirnseite des Gehäuses 2, die mit dem beweglichen Schaltstück 24 durch einen biegsamen Leiter 32 und einen durch den Auslöser hindurchführenden Heizleiter 33 verbunden ist.A toggle lever system is supported on the main pawl 12, the toggle levers 16 and 17 of which are connected to one another by a knee joint pin 20 and to a contact carrier 22 by a further hinge pin 21. This is attached to a control shaft 23 which is rotatably mounted in the lower part 4 of the housing 2. A movable contact piece 24, which is provided with a contact pad 25, is attached to the contact carrier 22 with the interposition of contact force springs (not shown). The movable contact piece 24 is opposite a fixed contact piece 26, which is also provided with a contact pad 27. The current path of the low-voltage circuit breaker 1 comprises, in addition to the switching elements mentioned, a connecting device 30 connected to the fixed switching element 26 and a further connecting device 31 on the opposite end face of the housing 2, which connects to the movable switching element 24 by means of a flexible conductor 32 and one by the trigger leading heating conductor 33 is connected.

In der dargestellten Einschaltstellung nehmen die Kniehebel 16 und 17 unter der Wirkung einer Antriebsfeder 34, die zwischen dem oberen Ende des Antriebshebels 7 und dem Kniegelenkbolzen 20 eingehängt ist, ihre Strecklage ein. Wird der Betätigungshandgriff 6 in der Richtung des Pfeiles 35 bewegt, so knicken die Kniehebel bei unveränderter Stellung der Hauptklinke 12 durch, wodurch der Kontaktträger 22 mit der Schaltwelle 23 entgegen dem Uhrzeigersinn geschwenkt und dadurch das bewegliche Schaltstück 24 von dem feststehenden Schaltstück 26 abgehoben wird. Ein entstehender Schaltlichtbogen wird in der mit Löschblechen 36 versehenen Löschkammer 37 gelöscht.In the switch-on position shown, the toggle levers 16 and 17 assume their extended position under the action of a drive spring 34 which is suspended between the upper end of the drive lever 7 and the knee joint pin 20. If the actuating handle 6 is moved in the direction of the arrow 35, the toggle levers bend when the main pawl 12 is in the unchanged position, as a result of which the contact carrier 22 with the switching shaft 23 is pivoted counterclockwise and the movable contact piece 24 is thereby lifted off the fixed contact piece 26. A resulting switching arc is extinguished in the quenching chamber 37 provided with quenching plates 36.

Aus Sicherheitsgründen wird angenommen, dass die Kontaktauflagen 25 und 27 des beweglichen Schaltstückes 24 und des feststehenden Schaltstückes 26 mehr oder weniger fest miteinander verschweissen können. Dies würde zu einem Blockieren des beweglichen Schaltstückes 24 in der Einschaltstellung führen. Für diesen Fall ist der Niederspannungs-Schutzschalter 1 mit einer Einrichtung versehen, die es verhindert, dass der Betätigungshandgriff 6 trotz der Blokkierung des beweglichen Schaltstückes in Richtung des Pfeiles 35 in die Ausschaltstellung bewegt und dort abgeschlossen werden kann. Wesentlicher Bestandteil dieser Schutzeinrichtung ist ein Sperrhebel 40, der auf der Schaltwelle 23 angeordnet und relativ zu dieser schwenkbar gelagert ist. Ein Gabelarm 41 des Sperrhebels 40 wirkt mit einer Arbeitsfläche 42 des Antriebshebels 7 zusammen, während ein weiterer Gabelarm 43 mit dem Kniegelenkbolzen 20 der Kniehebel 16 und 17 zusammenwirkt.For safety reasons, it is assumed that the contact pads 25 and 27 of the movable contact piece 24 and the fixed contact piece 26 can weld more or less firmly to one another. This would lead to blocking of the movable contact piece 24 in the switched-on position. In this case, the low-voltage circuit breaker 1 is provided with a device which prevents the actuating handle 6 from being moved into the switch-off position in the direction of arrow 35 despite the blocking of the movable contact piece, and from being able to be locked there. An essential component of this protective device is a locking lever 40 which is arranged on the selector shaft 23 and is pivotably mounted relative to the latter. A fork arm 41 of the locking lever 40 interacts with a working surface 42 of the drive lever 7, while another fork arm 43 interacts with the knee joint pin 20 of the toggle levers 16 and 17.

Der Sperrhebel 40 übergreift jedoch das Kniegelenk der Kniehebel 16 und 17 sowie den Antriebshebel 7 mit einem gewissen Spiel, das in der Fig. 1 zwischen dem Kniegelenkbolzen 20 und dem Gabelarm 43 dargestellt ist. Wird also bei blockiertem beweglichem Schaltstück 24 der Versuch unternommen, den Niederspannungs-Schutzschalter 1 auszuschalten, so wird zunächst über die Arbeitsfläche 42 des Antriebshebels 7 der Sperrhebel 40 mit seinem Gabelarm 41 mitgenommen, bis sich der andere Gabelarm 43 gegen den Kniegelenkbolzen 20 legt. Durch einen gewissen Kraftaufwand an dem Betätigungshandgriff 6 lassen sich dann die Kniehebel 16 und 17 im Ausschaltsinn durchknicken. Eine weitere Bewegung des Antriebshebels 7 ist jedoch nicht möglich. Daher lässt sich der Betätigungshandgriff 6 nicht in seine normale Ausschaltlage überführen, sondern nur um etwa den halben Weg.However, the locking lever 40 engages over the knee joint of the knee lever 16 and 17 and the drive lever 7 with a certain amount of play, which is shown in FIG. 1 between the knee joint pin 20 and the fork arm 43. If the attempt is made to switch off the low-voltage circuit breaker 1 when the movable switching element 24 is blocked, the blocking lever 40 with its fork arm 41 is first carried along over the working surface 42 of the drive lever 7 until the other fork arm 43 lies against the knee joint bolt 20. With a certain amount of force on the operating handle 6, the toggle levers 16 and 17 bend in the switch-off direction. A further movement of the drive lever 7 is not possible. Therefore, the operating handle 6 can not be moved to its normal switch-off position, but only about half way.

Durch die Gestaltung des Gabelarmes 43 des Sperrhebels 40 ist dafür gesorgt, dass alle betriebsmässigen Bewegungsabläufe innerhalb des Niederspannungs-Schutzschalters 1 nicht behindert werden oder eine störende Abnutzung eintritt. Die dem Kniegelenkbolzen 20 gegenüberstehende Fläche des Gabelarmes 43 ist zu diesem Zweck so geformt, dass beim Einschalten im Zustand der Kontaktberührung noch ein minimales Spiel zwischen dem Kniegelenk und der Arbeitsfläche des Antriebshebels einerseits und den Gabelarmen 41 und 43 andererseits besteht. Die beim Ausschaltversuch mit blockierten Schaltstücken auftretenden Kräfte werden im wesentlichen von dem Sperrhebel 40 selbst aufgenommen, so dass seine Lagerung auf der Schaltwelle 23 auf Druck beansprucht ist. Diese kann daher durch einen aus einem geeigneten Kunststoff bestehenden Lagerkörper gebildet sein, der innen eine dem Profil der Schaltwelle angepasste Öffnung und aussen eine zylindrische Lagerfläche für den Sperrhebel 40 besitzt. Dieser Lagerkörper kann zugleich das axiale Spiel begrenzen. Ferner bewirkt die Form des Sperrhebels 40, dass nicht nur eine Kraft zur Öffnung des Kniehebelsystems, sondern darüber hinaus eine Kraft zur Trennung von verschweissten Schaltstücken aufgebracht werden kann, die nicht durch in dem Schaltmechanismus vorhandene Vorspannkräfte begrenzt ist. Hierzu greift der Gabelarm 43 des Sperrhebels 40 mit seiner Fläche 48 an dem Kniegelenkbolzen 20 mit zwei unterschiedlich wirksamen Komponenten der Kraft an. Die eine Komponente wirkt in Richtung des Durchknickens der Kniehebel 16 und 17 und entsperrt dadurch das bewegbare Schaltstück. Die andere Komponente wirkt in Richtung des Widerlagers (Bolzen 18) des Kniehebels 16 an der Hauptklinke 12. Mit entsprechendem Kraftaufwand an dem Betätigungshandgriff 6 lässt sich dadurch eine Aufbrechkraft auf das bewegbare Schaltstück 24 ausüben, die durch das Einknicken der Kniehebel 16 und 17 zustande kommt. Diese Aufbrechkraft stützt sich über den Bolzen 18 an der Hauptklinke 12 ab, die ihrerseits an der Sperrlasche 14 anliegt.The design of the fork arm 43 of the locking lever 40 ensures that all operational movements within the low-voltage circuit breaker 1 are not hindered or that annoying wear and tear occurs. The surface of the fork arm 43 opposite the knee joint pin 20 is shaped for this purpose so that when switched on, in the state of contact contact, there is still minimal play between the knee joint and the working surface of the drive lever on the one hand and the fork arms 41 and 43 on the other hand. The forces occurring during the attempt to switch off with blocked contact pieces are essentially absorbed by the locking lever 40 itself, so that its bearing on the switching shaft 23 is subjected to pressure. This can therefore be formed by a suitable plastic bearing body which has an opening adapted to the profile of the selector shaft on the inside and a cylindrical bearing surface for the locking lever 40 on the outside. This bearing body can also limit the axial play. Furthermore, the shape of the locking lever 40 means that not only a force for opening the toggle lever system, but also a force for separating welded contact pieces can be applied, which is not limited by the pretensioning forces present in the switching mechanism. For this purpose, the fork arm 43 of the locking lever 40 engages with its surface 48 on the knee joint pin 20 with two components of the force that act differently. One component acts in the direction of the knee levers 16 and 17 buckling and thereby unlocks the movable switching element. The other component acts in the direction of the abutment (pin 18) of the toggle lever 16 on the main pawl 12. With a corresponding amount of force on the actuating handle 6, a breaking force can be exerted on the movable switching element 24 which is caused by the kinking of the toggle levers 16 and 17 . This breaking force is based on the bolt 18 on the main pawl 12, which in turn rests on the locking tab 14.

Einzelheiten der Anordnung des Sperrhebels 40 auf der Schaltwelle 23 zeigen die Fig. 2 und 3. Da es sich hierbei um eine gegenüber der Fig. 1 detailliertere Darstellung handelt, sind neue Bezugszeichen für die Einzelteile verwendet. Die Schaltwelle 50 besteht aus einem Metallkern und einer Umpressung aus einem isolierenden Kunststoff. Auf dieser Welle mit Vierkantprofil sind nebeneinander drei Schaltstückträger 51 befestigt, die einen U-förmig gebogenen Teil 52 und von den Schenkeln ausgehende Arme 53 aufweisen. Durch die Schenkel des U-förmig gebogenen Teiles 52 erstreckt sich die Schaltwelle 50. Eine die Schaltwelle umgreifende Klammer 54 ist mit dem U-förmigen Teil 52 vernietet und stellt eine starre Verbindung zwischen der Schaltwelle 50 und dem Schaltstückträger 51 her. Zur Lagerung der Schaltwelle 50 in dem Unterteil 4 des Gehäuses 2 (Fig. 1) befinden sich auf der Schaltwelle 50 zwischen den Schaltstückträgern 51 verschiebbar angeordnete Lagerkörper 55, die näher in der DE-B-2757696 beschrieben sind. Der mittlere Schaltstückträger 51 befindet sich zwischen den Schenkeln eines als Doppelhebel ausgebildeten Sperrhebels 56, der relativ zu der Schaltwelle 50 dreh- bzw. schwenkbar ist. Hierzu ist jeder der Schenkel 57 und 60 des Sperrhebels 56 mit einer Öffnung versehen, die auf einem auf der Schaltwelle 50 sitzenden weiteren Lagerkörper 61 gelagert ist. Anstelle dieser gesonderten Lagerkörper 61 können aber auch die ohnehin benötigten Lagerkörper 55 verwendet werden, sofern sie mit einer entsprechenden Verlängerung in Richtung der Schenkel 57 und 60 versehen sind.Details of the arrangement of the locking lever 40 on the control shaft 23 are shown in FIGS. 2 and 3. Since this is a more detailed illustration than in FIG. 1, new reference numerals are used for the individual parts. The selector shaft 50 consists of a metal core and an encapsulation made of an insulating plastic. On this shaft with a square profile, three contact piece carriers 51 are fastened side by side, which have a U-shaped part 52 and arms 53 extending from the legs. The control shaft 50 extends through the legs of the U-shaped part 52. A bracket 54 encompassing the control shaft is riveted to the U-shaped part 52 and establishes a rigid connection between the control shaft 50 and the contact piece carrier 51. For mounting the selector shaft 50 in the lower part 4 of the housing 2 (FIG. 1), there are displaceably arranged bearing bodies 55 on the selector shaft 50 between the contact piece carriers 51, which are described in more detail in DE-B-2757696. The middle contact piece carrier 51 is located between the legs of a locking lever 56 designed as a double lever, which can be rotated or pivoted relative to the switching shaft 50. For this purpose, each of the legs 57 and 60 of the locking lever 56 is provided with an opening which is mounted on a further bearing body 61 seated on the selector shaft 50. Instead of these separate bearing bodies 61, the bearing bodies 55 which are required anyway can also be used, provided that they are provided with a corresponding extension in the direction of the legs 57 and 60.

Weitere Einzelheiten des Sperrhebels 56 sind den Fig.4 und 5 zu entnehmen, in denen der Sperrhebel gegenüber den Fig. 2 und 3 vergrössert gezeigt ist. Der Sperrhebel 56 ist als Gussteil ausgeführt, so dass die beiden Schenkel 57 und 60 mit einem Verbindungssteg 62 ein zusammenhängendes Bauteil bilden. Die Schenkel 57 und 60 sind spiegelbildlich geformt und weisen jeweils zwei Gabelarme 63 und 64 auf. Diese besitzen eine hohe Steifigkeit gegen eine Spreizung durch die Kräfte in Form der zulässigen Handkraft an Handhaben, wie sie beim Versuch des Ausschaltens mit blockierten Schaltstücken auftreten können. Hierzu ist an jedem der beiden Schenkel eine Verstärkungsrippe 65 vorgesehen, die zusammen mit der äusseren Wandung der Schenkel ein U-förmiges Profil bilden. Nahe dem Ende des Gabelarmes 63 ist ein gekrümmter Bereich 66 vorgesehen, der mit dem Kniegelenk, d.h. in der Regel mit dem Kniegelenkbolzen des Schaltmechanismus zusammenwirkt. Wie bereits erwähnt, ist die Kurvenform dieses Bereiches so gewählt, dass während des Einschaltens im Zeitpunkt der Kontaktberührung ein minimales Spiel und im vollständig eingeschalteten Zustand ein etwas grösseres Spiel entsprechend der Fig. 1 besteht. Der gegenüberliegende Gabelarm 64 besitzt an seinem Ende eine gewölbte Fläche 67 zur Anlage an dem Antriebshebel 7 in Fig. 1. Durch eine abgewinkelte bzw. abgekröpfte Form der Gabelarme 63 und 64 wird erreicht, dass die Enden der Gabelarme die richtige Lage bezüglich der Gegenflächen des Schaltmechanismus erhalten. Hierzu sind die Flächen 67 an den einander abgewandten Seiten der Schenkel vorgesehen, während die gekrümmten Bereiche 66 an den einander zugewandten Seiten der Schenkel angeordnet sind (Fig. 3 und 4). Im montierten Zustand des Schalters liegen die Schenkel des doppelt bzw. paarig ausgebildeten Antriebshebels 7 parallel zu den Schenkeln 57 und 60 des Sperrhebels 56 an dessen Aussenseiten. Die Abkröpfung bzw. Abwinklung der Gabelarme 64 nach aussen wird nicht benötigt, wenn der Antriebshebel 7 (Fig. 1) eine entsprechende Auswölbung, einen Ansatz o. dgl. besitzt.Further details of the locking lever 56 can be seen in FIGS. 4 and 5, in which the locking lever is shown enlarged compared to FIGS. 2 and 3. The locking lever 56 is designed as a cast part, so that the two legs 57 and 60 form a coherent component with a connecting web 62. The legs 57 and 60 are mirror images and each have two fork arms 63 and 64. These have a high degree of rigidity against spreading due to the forces in the form of the permissible hand force to handle, as can occur when trying to switch off with blocked contact pieces. For this purpose, a reinforcing rib 65 is provided on each of the two legs, which together with the outer wall of the legs form a U-shaped profile. A curved region 66 is provided near the end of the fork arm 63 which is connected to the knee joint, i.e. usually cooperates with the knee joint bolt of the switching mechanism. As already mentioned, the curve shape of this area is selected such that there is minimal play when switching on at the point of contact and in the fully switched-on state there is a slightly larger play according to FIG. 1. The opposite fork arm 64 has at its end a curved surface 67 for abutting the drive lever 7 in Fig. 1. An angled or cranked shape of the fork arms 63 and 64 ensures that the ends of the fork arms are in the correct position with respect to the counter surfaces of the Switch mechanism received. For this purpose, the surfaces 67 are provided on the sides of the legs facing away from one another, while the curved regions 66 are arranged on the sides of the legs facing one another (FIGS. 3 and 4). In the assembled state of the switch, the legs of the double or paired drive lever 7 are parallel to the legs 57 and 60 of the locking lever 56 on the outside thereof. The cranking or angling of the fork arms 64 to the outside is not required if the drive lever 7 (FIG. 1) has a corresponding bulge, a shoulder or the like.

Der Lagerkörper 61 hat die Form einer Buchse, die innen dem Vierkantprofil der Schaltwelle 50 angepasst und ebenso so wie die Lagerkörper 55 auf der Schaltwelle verschiebbar ist. Aussen besitzen die Lagerkörper 61 eine zylindrische Lagerfläche für die innere Öffnung 68 des Sperrhebels 56. Ein Bund 69 zur Begrenzung der axialen Verschiebbarkeit des Sperrhebels 56 kann Bestandteil des Lagerkörpers 61 oder - wie die Fig. 4 und 5 zeigen - Bestandteil des Sperrhebels 56 sein.The bearing body 61 has the shape of a bush, which is adapted to the square profile of the selector shaft 50 on the inside and, like the bearing body 55, is displaceable on the selector shaft. Outside, the bearing bodies 61 have a cylindrical bearing surface for the inner opening 68 of the locking lever 56. A collar 69 for limiting the axial displaceability of the locking lever 56 can be part of the bearing body 61 or - as FIGS. 4 and 5 show - part of the locking lever 56.

Ein gleichfalls als Gussteil ausgebildeter Sperrhebel 70 ist in der Fig. 6 gezeigt. Unterschiedlich gegenüber dem Sperrhebel 56 ist lediglich die Gestalt der Gabelarme 71 und 72, die an die abweichende Form und Bewegung des Schaltmechanismus eines anderen Schutzschalters angepasst ist. Auch der Sperrhebel 70 ist als Doppelhebel mit spiegelbildlich gestalteten Schenkeln und einem Verbindungssteg 73 geformt.A locking lever 70, also designed as a cast part, is shown in FIG. 6. The only difference from the locking lever 56 is the shape of the fork arms 71 and 72, which is adapted to the different shape and movement of the switching mechanism of another circuit breaker. The locking lever 70 is also formed as a double lever with mirror-image legs and a connecting web 73.

Während die Sperrhebel 56 und 70 als Gussteile, z.B. als Kokillengussteile gestaltet sind, lassen sich Sperrhebel mit der gleichen Funktion auch durch Stanzen und Biegen aus Blech herstellen. Anstelle von Doppelhebeln sind auch einzelne Hebel oder zwei einzelne Hebel verwendbar, die auf beliebige geeignete Weise hergestellt sein können. Durch die Lagerkörper oder zusätzliche gesonderte Teile können eine seitliche Verschiebung und/oder ein Verkanten verhindert sein. Bei den beschriebenen Doppelhebeln entfällt die Gefahr einer Verkantung, so dass es nur erforderlich ist, die seitliche Verschiebung zu begrenzen.While the locking levers 56 and 70 as castings, e.g. As die cast parts, locking levers with the same function can also be produced from sheet metal by punching and bending. Instead of double levers, single levers or two individual levers can also be used, which can be produced in any suitable manner. Lateral displacement and / or tilting can be prevented by the bearing body or additional separate parts. With the double levers described there is no risk of canting, so that it is only necessary to limit the lateral displacement.

Claims (6)

1. A low-voltage protective switch (1) having an operating lever (7), which is movable by an operating handle (6) and which acts, by means of a driving spring (34) and two toggle levers (16, 17), which are connected by a toggle joint, on a switching shaft (23; 50) which is provided with movable contacts (24), as well as having a locking lever (40; 56), which is fitted onto the switching shaft (23; 50), against movement of the operating handle (6) into the off-position in the case of movable contacts (24) which are locked in the on- position, characterised in that the locking lever (40; 56) is mounted on the switching shaft (23; 50) so as to be pivotable in relation thereto and engages in a forked manner over the toggle joint (fulcrum pin 20) of the toggle levers (16, 17), and an operating surface (42) of the operating lever (7) with a play which corresponds to only a partial movement of the operating lever (7) in the direction (35) of the off-position (Fig. 1).
2. A low-voltage protective switch according to Claim 1, characterised in that the locking lever (40) has a forked arm (41) which is angled or cranked at its end, for contacting the operating surface (42) of the operating lever (7), and has a further similarly designed forked arm (43) for contacting the fulcrum pin (20) which forms the toggle joint (Fig. 1).
3. A low-voltage protective switch according to Claim 1, characterised in that in the on-position the play between the fork arms (41, 43) of the locking lever (4) and the counter-surfaces of the operating lever (7) and the toggle joint (fulcrum pin 20) is relatively great compared with the contacting state (Fig. 1).
4. A low-voltage protective switch according to Claim 1, characterised in that, with a multi- sided switching shaft (50), the locking lever (56) is mounted on a support body (61), which is fitted onto the switching shaft (50) and has a cylindrical outer surface, and is supported against tilting and/or lateral displacement (Fig. 2, 3).
5. A low-voltage protective switch according to Claim 1 or 4, characterised in that two enantiomorphic locking levers are provided which have individual seating support, in association with an operating lever (7) in the form of a pair. 6. A low-voltage protective switch according to Claim 1, characterised in that the locking lever (56) in association with an operating lever in the form of a pair, is constructed as a double lever with two enantiomorphic flanks (57, 60) and a bridge (62) which connects these flanks (Fig. 4,5).
EP81730071A 1980-08-29 1981-08-06 Low-voltage protective circuit breaker with blocking lever Expired EP0047221B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81730071T ATE10688T1 (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
DE3033213 1980-08-29
DE3033213A DE3033213C2 (en) 1980-08-29 1980-08-29 Low voltage circuit breaker with a locking lever

Publications (3)

Publication Number Publication Date
EP0047221A2 EP0047221A2 (en) 1982-03-10
EP0047221A3 EP0047221A3 (en) 1982-10-06
EP0047221B1 true EP0047221B1 (en) 1984-12-05

Family

ID=6111065

Family Applications (1)

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EP81730071A Expired EP0047221B1 (en) 1980-08-29 1981-08-06 Low-voltage protective circuit breaker with blocking lever

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US (1) US4392036A (en)
EP (1) EP0047221B1 (en)
JP (1) JPS5774932A (en)
AT (1) ATE10688T1 (en)
DE (1) DE3033213C2 (en)

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Also Published As

Publication number Publication date
ATE10688T1 (en) 1984-12-15
DE3033213A1 (en) 1982-03-11
DE3033213C2 (en) 1982-10-21
EP0047221A2 (en) 1982-03-10
EP0047221A3 (en) 1982-10-06
JPS6253898B2 (en) 1987-11-12
JPS5774932A (en) 1982-05-11
US4392036A (en) 1983-07-05

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