EP0543208B1 - Protective circuit-breaker with rocker - Google Patents

Protective circuit-breaker with rocker Download PDF

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Publication number
EP0543208B1
EP0543208B1 EP92118774A EP92118774A EP0543208B1 EP 0543208 B1 EP0543208 B1 EP 0543208B1 EP 92118774 A EP92118774 A EP 92118774A EP 92118774 A EP92118774 A EP 92118774A EP 0543208 B1 EP0543208 B1 EP 0543208B1
Authority
EP
European Patent Office
Prior art keywords
switching rocker
frame
rocker
protective circuit
switching
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 - Lifetime
Application number
EP92118774A
Other languages
German (de)
French (fr)
Other versions
EP0543208A1 (en
Inventor
Paul Cambreleng
Karl R. Kropp
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 Electromechanical Components Inc
Original Assignee
Potter and Brumfield Inc
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 Potter and Brumfield Inc filed Critical Potter and Brumfield Inc
Publication of EP0543208A1 publication Critical patent/EP0543208A1/en
Application granted granted Critical
Publication of EP0543208B1 publication Critical patent/EP0543208B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/0207—Mounting or assembling the different parts of the circuit breaker
    • H01H71/0221—Majority of parts mounted on central frame or wall
    • 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
    • H01H71/54—Manual reset mechanisms which may be also used for manual release actuated by tumbler

Definitions

  • This circuit breaker is preferably used as an overcurrent circuit breaker, with a known trigger mechanism, for example with a bimetal strip, being provided.
  • Such an overcurrent circuit breaker is known for example from US-A-4,931,762.
  • a rocker switch as an actuating element, which is pivotably mounted on a frame by means of a bearing pin.
  • the rocker switch has an actuating arm, which is connected to a coupling link Swivel arm are connected, wherein the coupling members are each mounted with molded pins in the actuating arm of the rocker and in the swivel arm.
  • the swivel arm itself is mounted in the frame via a pin which is longitudinally movable in a guide slot in the frame.
  • the object of the invention is to design a circuit breaker of the type mentioned in such a way that all functional elements can be easily connected to one another without additional bearing pins or other fastening elements being required.
  • rocker switch and the other functional elements are to be guided and securely fastened both during assembly and in operation, without special individual elements having to be manufactured and assembled for such guides or interlocks.
  • the frame has a rod-shaped projection which extends under one movable end of the rocker switch and approximately in accordance with the pivoting movement of the rocker switch is curved in a circular arc that the shift rocker has a fork extension at the mentioned movable end, which comprises the projection of the frame during the switching movement, and that the return spring sits on the projection and is supported on the fork extension.
  • the projection of the frame which extends next to one end of the rocker switch and is curved in accordance with the pivoting movement of this rocker end, forms, together with the fork extension of the rocker, a guide for this, which facilitates mounting in the correct position already during assembly, but also in Operation of the switch maintains this management function.
  • this projection serves as a carrier and guide element for the helical return spring, which is supported on the frame on the one hand and on the fork extension of the rocker switch on the other hand and thus prestresses it in an off position.
  • the rocker itself is preferably latched on bearing elements of the frame, which are formed in the form of oppositely projecting bearing pins on the bearing support, the rocker switch in opposite side walls each having a bearing recess with which it is mounted on one of the bearing pins, and at least one of the side walls of the rocker switch in the area between the bearing recess and its edge has an elastically deformable section, by means of which the rocker switch can be pushed onto the associated bearing journal and latched thereon.
  • the circuit elements each comprise a fixed contact element 1, which is formed in one piece with a connection element 3 and is bent perpendicular to the latter.
  • contact springs 5 made of leaf spring metal which are clamped on one side and each carry a contact piece 7 at their free end.
  • Each contact spring 5 is attached at its opposite end in a conventional manner to a circuit breaker frame 9 made of insulating material. In a relaxed position, the respective contact spring 5 holds its contact piece 7 above and separate from the associated fixed contact element 1 and thus keeps the corresponding circuit open.
  • Flexible conductors or strands 11 are each fastened at one end close to the point of the contact springs 5 where they are connected to the frame 9.
  • the fastening area for the respective strand 11 can be a section of the spring material be which is bent at an angle from the fastening area of the respective contact spring 5.
  • Each strand 11 is fastened at its opposite end to one end of a corresponding bimetal strip 13, which consists of two or more different metallic materials. These metallic materials have different coefficients of thermal expansion.
  • the ends of the two bimetal strips 13 opposite the respective strand connection are connected at an angle to corresponding load connection elements 15. Both the bimetallic strips 13 and the load connection elements 15 are locked to the frame 9 such that the load connection elements 15 protrude through the bottom of the frame 9.
  • a common pawl 17 is arranged directly adjacent to and at a short distance from the bimetal strips 13.
  • This pawl 17 has a cylindrical surface 19 in the form of a transverse axis, which can be snapped into a bearing recess 21 in the frame 9 with a partially circular wall.
  • the circular arc-shaped bearing recess 21 extends with its cylindrical wall over an angle of more than 180 ° and has an opening which corresponds to the diameter of the cylindrical surface or the transverse axis 19. Since the open gap of the partially round bearing recess 21 and the cylindrical surface of the transverse axis are the same, an overlap of the parts is provided in such a way that the cylindrical surface or transverse axis 19 must be pressed or snapped into the round bearing recess 21.
  • the round bearing recess 21 is first widened to accommodate the cylindrical surface or transverse axis 19 and then takes its original position or shape again, holding the cylindrical surface or transverse axis, but allowing its free rotation within the bearing recess 21. If the pawl 17 is subjected to an external force, it can pivot freely over the cylindrical surface or transverse axis 19.
  • the widening of the bearing recess 21 for inserting the transverse axis 19 of the pawl is preferably made possible in such a way that the open section of the bearing recess 21 is limited by a resiliently deformable latching tongue 22 which is formed on the frame and enables the pawl to snap in with its transverse axis 19 and after snapping the pawl, the bearing recess 21 closes again.
  • the common pawl 17 has an upper portion 23 and a lower portion 25.
  • the lower portion 25 engages and disengages with a locking portion 26 of a cam lever 27, which will be described later.
  • the upper section 23 of the pawl 17 is biased into its rest position by a compression spring 29. In this position, it can engage the bimetallic strips 13 when they are heated and bend accordingly towards the upper section 23 of the pawl.
  • the force exerted by the bimetallic strips 13 on the upper section 23 of the pawl causes the pawl 17 to pivot within the bearing recess 21.
  • the pawl is returned to its initial position by the compression spring 29.
  • the compression spring 29 is arranged and fixed between the frame 9 and the upper section 23 of the pawl in a conventional manner. Even if the pawl is reset to its initial state after tripping, the cam lever remains in its tripped state until it is manually switched back to its on state brought, which will be described in more detail later.
  • the frame 9 has a bearing support 30 for holding a rocker switch 33 and a cylindrical bearing journal 31 on both sides thereof; the rocker switch 33 engages on these journals with bearing recesses 35 formed in opposite side walls 38. After the switching rocker 33 has snapped into place on the bearing journal 31, the recesses 35 serve as a pivot axis for the switching rocker for its movements between a switch-on and a switch-off position.
  • the partially circularly cut-out bearing recesses 35 in the side walls 38 of the rocker switch each have an open side, which is largely closed by a flexible tongue 37 fastened on one side.
  • This tongue 37 in each of the two side walls 38 of the rocker switch is formed by slots in the side walls, which each extend up to the vicinity of an end edge of this respective side wall.
  • the tongues 37 can thus bend outwards and enable the bearing journal to snap into the bearing recesses 35.
  • the journals run within the two grooves 40 and at the same time press the flexible tongues 37 outward until the journals 31 are engaged in the bearing recesses 35.
  • the flexible tongues 37 then spring back into their starting position and hold the journals 31 in the circular bearing recesses 35 and thereby form bearing surfaces for the journals 31 when the rocker switch rotates around these journals during the movement between the switch-on and switch-off positions.
  • rocker switch 33 on the frame 9 is simple and accurate, without requiring any additional pins, rivets, screws or other fasteners.
  • the rocker switch is a single molded part, which can be made of opaque or transparent plastic.
  • Figures 3 and 4 show a detailed view of the locking arrangement for the rocker switch.
  • the rocker switch 33 is connected to the cam lever 27 via coupling arms 39 attached on both sides for transmitting the switching movement.
  • the coupling arms 39 each have at one end a tapered and slotted rocker pivot pin 41 which is inserted through a corresponding round opening 43 in the rocker switch 33.
  • the pivot pin 41 When the pivot pin 41 is inserted into the openings 43, the slotted sections are pressed together. After insertion, these slotted sections spring apart again and lock, for example with projecting shoulders or the like, on the inside of the side walls 38 in the region of the openings 43; the pivot pins 41 are thus held in place, but allow the coupling arms 39 to pivot relative to the rocker switch 33.
  • the coupling arms 39 each have a cam lever pivot pin 45 at the opposite end to the rocker pivot pins 41. These cylindrical pivot pins 45 project through corresponding openings 47 in the cam lever 27 and beyond into a groove 49 in the frame 9. These grooves 49 on both sides of the frame 9 extend in the switching direction from the rocker switch in the direction of the movable contact springs 5, and the movement of the cam lever pivot pin 45 in the grooves 49 causes a switching path which actuates the switching part of the circuit breaker.
  • the cam lever pivot pins 45 act as bearing axles for the cam lever 27.
  • the coupling arms 39 also each have a shoulder 50 at a certain distance from the respective rocker pivot pin 41; The arcuate edge 51 of the respective side wall 38 of the rocker switch can roll on this shoulder 50.
  • the cam lever 27 is split in a fork shape and thus includes the bearing support for the rocker switch 33 with two actuating arms 28. With the ends of the actuating arms 28, the switching force transmitted from the rocker switch 33 via the coupling arms 39 is exerted on the contact springs 5.
  • a spring 53 is arranged between the rocker switch and the frame 9.
  • the frame 9 has a spring support 55 with a curved projection 57, which extends approximately along the circular direction of movement of the one movable end 34 of the rocker switch 33.
  • the rocker switch has a fork extension 59, which extends outward at the end 34 and comprises the projection 57 with its two arms.
  • the curved projection 57 thus extends through the fork extension 59 and thus forms a guide for the rocker switch 33 when it is pivoted between its switch-on and switch-off positions.
  • the fork extension 59 also serves as an upper support for the spring 53.
  • the fork extension 59 and the curved projection 57 are already used during the assembly of the rocker switch 33 to guide it and center it on its mounting, and subsequently they also serve this purpose to hold the spring 53 in place and in its elongated-curved shape.
  • the fork extension 59 can additionally have on its underside a pin 58, indicated in FIG. 1, which engages in the spring 53 in order to additionally improve the stability of the holder and guide for the spring.
  • the circuit breaker also has two adjusting screws 60, each of which corresponds to one of the bimetal strips 13 and is assigned.
  • the distance between the bimetallic strips 13 and the common pawl 17 determines how much the bimetallic strips have to bend to touch the common pawl 17.
  • the extent to which the bimetallic strips 13 bend is a function of that which bears against them Current. Accordingly, by using the adjusting screws 60 in connection with the nuts 62 clamped in the frame for the purpose of adjusting the angular distance between the bimetallic strips 13 and the common pawl 17, the distance required for the overload condition can be set.
  • the circuit breaker with rocker switch can also contain a miniature lamp 61, which is arranged on a support surface 63 in the frame 9. In this case, connecting wires 65 connect the miniature lamp to the load connections 15.
  • a resistor (not shown) is expediently switched into the lamp circuit in order to limit the current through the lamp.
  • an auxiliary switch 67 can also be additionally fastened in the frame 9 for certain applications; for this purpose the frame has laterally projecting cylindrical retaining pins 69 which engage in corresponding retaining holes 71 in the auxiliary switch 67.
  • the frame 9 comprises the auxiliary switch 67 from three sides in a recess.
  • a lever 73 which is tied up in the frame 9, actuates the auxiliary switch 67 when it is moved in accordance with a movement of the contact springs 5 during their actuation by the rocker switch 33 into its on or off position.
  • a cap 75 has an upper flange part 77 with a right-angled opening 78 through which the rocker switch 33 engages.
  • the cap 75 is open at the bottom so that the entire circuit breaker mechanism can be inserted into the cap.
  • the cap 75 is held in the assembled position by the engagement of chamfered projections 79 in corresponding openings 81 in the side wall 83 of the cap 75.
  • the cap 75 is secured by stops which are formed by interlocking parts of the frame 9 and the cap 75.
  • the cap 75 also has a snap fastening device, which makes it possible to mount the cap with a control panel (not shown) to engage.
  • the latching fastening device consists of flexible arms 85 which extend downward from the flange section 73 (FIG. 2) or upward from a side wall of the cap (FIG. 1). They have sawtooth-shaped notches 87, which engage behind flange sections of a control panel. The flexible arms could also protrude the width of the circuit breaker to help center the circuit breaker in a cutout in the panel.
  • Figure 5 shows the circuit breaker parts in the off position. This position results when the rocker switch is manually brought into the off position or when the circuit breaker has been triggered by the heating of one of the bimetal strips 13 and its movement against the pawl 17 and, accordingly, the pawl 17 after the bimetal strip has cooled by the compression spring 53 in it Normal position was returned.
  • the contact springs 5 are in the open position so that the cam lever pivot pins 45 are in the upper section of the guide groove 49 and the locking section 26 of the cam lever 27 is in engagement with the lower section 25 of the common pawl 17. All parts are held in position by the rocker return spring 53.
  • Figure 6 shows the circuit breaker in the on position.
  • the rocker switch 33 is pressed into the switched-on position, which brings one end of the coupling arm 39 through an angle to an over-center position relative to the guided position of the other end with the cam lever pivot pin 45.
  • the lower portion of the common pawl 17 is engaged with the locking portion 26 of the cam lever 27, which causes the cam lever 27 to bring the contact springs 5 into the closed position while doing so
  • the bimetallic strip 13 bends toward the upper portion 23 of the common pawl 17 and, after contacting it, exerts sufficient force on the lower portion 25 of the common pawl 17 to be released from the locking section 26 of the cam lever 27. This enables the locking section 26 of the shift lever 27 to be pivoted and thus a release of the holding force which was exerted by the over-center position of the rocker switch 33.
  • the return spring 53 brings the rocker switch 33 into the off position.
  • the trigger position is shown in Figure 7.
  • Figure 8 shows the circuit breaker in a position in which the rocker switch 33 is held in the ON position. This state is called the release free position.

Abstract

The protective circuit breaker has a frame (9) which consists of insulating material and has an integrally formed bearing support (30) on which a switching rocker (33) is arranged such that it can pivot. Via coupling arms (39) and a cam lever (27), this switching rocker operates at least one contact spring (5) which forms a switching contact with a stationary contact element (1). A tripping mechanism having a bimetallic strip (13) and a switching latch (17) trips the lock of the cam lever (27) in the event of heating resulting from an overcurrent. <??>The switching rocker (33) is mounted, as are the other parts, without additional bearing pins or other mounting elements. A restoring spring (53) is seated on a curved projection (57) of the frame and engages in a fork projection (59) of the switching rocker (33). In this way, the switching rocker (33) and the restoring spring (53) are guided and aligned with respect to one another as well as possible, using parts which are as simple as possible. The switching rocker itself is mounted via sprung tongues (37) such that it can be latched on integrally formed bearing journals (31) of the frame (9). <IMAGE>

Description

Die Erfindung betrifft einen Schutzschalter, welcher folgende Merkmale aufweist:

  • einen Rahmen mit einer Lagerstütze,
  • eine schwenkbar auf der Lagerstütze gelagerte Schaltwippe,
  • mindestens ein an dem Rahmen befestigtes feststehendes Kontaktelement,
  • mindestens eine bewegliche Kontaktfeder, welche mit einem Ende an dem Rahmen befestigt ist und mit ihrem zweiten, beweglichen Ende dem feststehenden Kontaktelement gegenübersteht,
  • mindestens ein Betätigungsorgan, welches die Position der Schaltwippe auf die bewegliche Kontaktfeder zu übertragen vermag,
  • einen Auslösemechanismus zur Verriegelung und Auslösung des Betätigungsorgangs und
  • eine schraubenförmige Rückstellfeder, welche sich an dem Rahmen und der Schaltwippe abstützt und diese in eine Ausschaltposition vorspannt.
The invention relates to a circuit breaker which has the following features:
  • a frame with a bearing support,
  • a rocker switch pivotally mounted on the bearing support,
  • at least one fixed contact element attached to the frame,
  • at least one movable contact spring, which is attached to the frame at one end and faces the fixed contact element with its second, movable end,
  • at least one actuator which is able to transmit the position of the rocker switch to the movable contact spring,
  • a trigger mechanism for locking and triggering the actuating mechanism and
  • a helical return spring, which is supported on the frame and the rocker switch and biases them into an off position.

Vorzugsweise wird dieser Schutzschalter angewendet als Überstrom-Schutzschalter, wobei ein bekannter Auslösemechanismus, etwa mit einem Bimetallstreifen, vorgesehen wird.This circuit breaker is preferably used as an overcurrent circuit breaker, with a known trigger mechanism, for example with a bimetal strip, being provided.

Ein derartiger Überstrom-Schutzschalter ist beispielsweise aus der US-A-4,931,762 bekannt. Er weist, wie bei derartigen Schaltern allgemein üblich, eine Schaltwippe als Betatigungselement auf, welche mittels eines Lagerstiftes auf einem Rahmen schwenkbar gelagert ist. Die Schaltwippe besitzt einen Betätigungsarm, welcher über Kupplungsglieder mit einem Schwenkarm verbunden sind, wobei die Kupplungsglieder jeweils mit angeformten Stiften in dem Betätigungsarm der Wippe und in dem Schwenkarm gelagert sind. Der Schwenkarm selbst ist im Rahmen über einen Stift gelagert, welcher in einem Führungsschlitz des Rahmens längsbeweglich ist. Bei derartigen herkömmlichen Wippschaltern besteht das Problem, daß die Vielzahl von Führungsstiften, Nieten, Schrauben und anderen Befestigungselementen zur Verbindung all der beweglichen Teile miteinander die Fertigung von vielen Einzelteilen und eine schwierige Montage dieser Teile bedingt, wodurch die Kosten des Schutzschalters steigen.Such an overcurrent circuit breaker is known for example from US-A-4,931,762. As is generally the case with such switches, it has a rocker switch as an actuating element, which is pivotably mounted on a frame by means of a bearing pin. The rocker switch has an actuating arm, which is connected to a coupling link Swivel arm are connected, wherein the coupling members are each mounted with molded pins in the actuating arm of the rocker and in the swivel arm. The swivel arm itself is mounted in the frame via a pin which is longitudinally movable in a guide slot in the frame. The problem with such conventional rocker switches is that the large number of guide pins, rivets, screws and other fastening elements for connecting all the moving parts to one another requires the production of many individual parts and a difficult assembly of these parts, which increases the cost of the circuit breaker.

Bei dem bekannten Schutzschalter gemäß US-A-4,931,762 ist außerdem eine Schraubenfeder zwischen dem Rahmen und dem Betätigungsarm der Wippe angeordnet, welche zur Vorspannung der Wippe in ihre Ruheposition dient. Da diese Schraubenfeder jedoch keine Führung besitzt, biegt sie sich im Lauf der Zeit immer mehr seitlich durch, wodurch sich die Rückstellkraft im Lauf der Zeit vermindert und unter Umständen nicht mehr zur einwandfreien Rückstellfunktion ausreicht.In the known circuit breaker according to US-A-4,931,762 a coil spring between the frame and the actuating arm of the rocker is also arranged, which serves to bias the rocker in its rest position. However, since this coil spring does not have a guide, it bends more and more laterally over time, which means that the restoring force is reduced over time and may no longer be sufficient to function properly.

Aufgabe der Erfindung ist es, einen Schutzschalter der eingangs genannten Art so zu gestalten, daß alle Funktionselemente einfach miteinander zu verbinden sind, ohne daß zusätzliche Lagerstifte oder sonstige Befestigungselemente erforderlich sind.The object of the invention is to design a circuit breaker of the type mentioned in such a way that all functional elements can be easily connected to one another without additional bearing pins or other fastening elements being required.

Insbesondere sollen die Schaltwippe und die sonstigen Funktionselemente sowohl bei der Montage als auch im Betrieb jeweils einwandfrei geführt und sicher befestigt werden, ohne daß für derartige Führungen oder Verriegelungen besondere Einzelelemente hergestellt und montiert werden müßten.In particular, the rocker switch and the other functional elements are to be guided and securely fastened both during assembly and in operation, without special individual elements having to be manufactured and assembled for such guides or interlocks.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß der Rahmen einen stangenförmigen Vorsprung aufweist, der sich unter dem einen beweglichen Ende der Schaltwippe erstreckt und entsprechend der Schwenkbewegung der Schaltwippe annähernd kreisbogenförmig gekrümmt ist, daß die Schaltwippe an dem erwähnten beweglichen Ende einen Gabelfortsatz aufweist, der während der Schaltbewegung den Vorsprung des Rahmens umfaßt, und daß die Rückstellfeder auf dem Vorsprung sitzt und sich an dem Gabelfortsatz abstützt.According to the invention, this object is achieved in that the frame has a rod-shaped projection which extends under one movable end of the rocker switch and approximately in accordance with the pivoting movement of the rocker switch is curved in a circular arc that the shift rocker has a fork extension at the mentioned movable end, which comprises the projection of the frame during the switching movement, and that the return spring sits on the projection and is supported on the fork extension.

Der Vorsprung des Rahmens, der sich neben dem einen Ende der Schaltwippe erstreckt und entsprechend der Schwenkbewegung dieses Wippenendes gekrümmt ist, bildet zusammen mit dem Gabelfortsatz der Wippe eine Führung für diese, die bereits bei der Montage das Aufsetzen in richtiger Position erleichtert, aber auch im Betrieb des Schalters diese Führungsfunktion beibehält. Außerdem dient dieser Vorsprung als Träger und Führungselement für die schraubenförmige Rückstellfeder, welche sich an dem Rahmen einerseits und an dem Gabelfortsatz der Schaltwippe andererseits abstützt und diese somit in eine Ausschaltposition vorspannt.The projection of the frame, which extends next to one end of the rocker switch and is curved in accordance with the pivoting movement of this rocker end, forms, together with the fork extension of the rocker, a guide for this, which facilitates mounting in the correct position already during assembly, but also in Operation of the switch maintains this management function. In addition, this projection serves as a carrier and guide element for the helical return spring, which is supported on the frame on the one hand and on the fork extension of the rocker switch on the other hand and thus prestresses it in an off position.

Die Wippe selbst ist vorzugsweise einrastbar auf Lagerelementen des Rahmens gelagert, welche in Form von entgegengesetzt abstehenden Lagerzapfen an der Lagerstütze angeformt sind, wobei die Schaltwippe in gegenüberliegenden Seitenwänden jeweils eine Lagerausnehmung aufweist, mit der sie jeweils auf einem der Lagerzapfen gelagert ist, und wobei mindestens eine der Seitenwände der Schaltwippe im Bereich zwischen der Lagerausnehmung und ihrem Rand einen elastisch deformierbaren Abschnitt aufweist, über den die Schaltwippe auf den zugehörigen Lagerzapfen aufschiebbar und auf diesem einrastbar ist. Weitere Ausgestaltungen sind in den Unteransprüchen angegeben.The rocker itself is preferably latched on bearing elements of the frame, which are formed in the form of oppositely projecting bearing pins on the bearing support, the rocker switch in opposite side walls each having a bearing recess with which it is mounted on one of the bearing pins, and at least one of the side walls of the rocker switch in the area between the bearing recess and its edge has an elastically deformable section, by means of which the rocker switch can be pushed onto the associated bearing journal and latched thereon. Further refinements are specified in the subclaims.

Die Erfindung wird nachfolgend an einem Ausführungsbeispiel anhand der Zeichnung näher erläutert. Es zeigen

  • Figur 1 eine Explosionszeichnung eines zweipoligen Schutzschalters mit erfindungsgemäß gestalteter Führung der Schaltwippe,
  • Figur 2 eine teilweise geschnittene Seitenansicht des Schutzschalters von Figur 1,
  • Figur 3 die Schaltwippe in Seitenansicht,
  • Figur 4 einen Schnitt IV-IV durch die Schaltwippe der Figur 3,
  • Figur 5 eine teilweise geschnittene Seitenansicht des Schutzschalters von Figur 1 in ausgeschaltetem Zustand,
  • Figur 6 eine Figur 5 entsprechende Seitenansicht des Schutzschalters in eingeschaltetem Zustand,
  • Figur 7 eine Seitenansicht des vorher gezeigten Schutzschalters mit teilweise geöffneter Seitenwand zur Darstellung des ausgelösten Zustandes des Schalters und
  • Figur 8 eine Seitenansicht des Schutzschalters in ausgelöstem Zustand trotz Festhaltens der Schaltwippe in Einschaltstellung.
The invention is explained in more detail using an exemplary embodiment with reference to the drawing. Show it
  • FIG. 1 shows an exploded view of a two-pole circuit breaker with the switching rocker designed according to the invention,
  • FIG. 2 shows a partially sectioned side view of the circuit breaker from FIG. 1,
  • 3 shows the rocker switch in side view,
  • FIG. 4 shows a section IV-IV through the rocker switch of FIG. 3,
  • FIG. 5 shows a partially sectioned side view of the circuit breaker from FIG. 1 in the switched-off state,
  • FIG. 6 shows a side view of the circuit breaker corresponding to FIG. 5 in the switched-on state,
  • Figure 7 is a side view of the circuit breaker previously shown with the side wall partially open to show the triggered state of the switch and
  • Figure 8 is a side view of the circuit breaker in the triggered state despite holding the rocker switch in the on position.

Anhand der Figuren 1 und 2 sei nunmehr der Innenaufbau eines zweipoligen Überstrom-Schutzschalters beschrieben. Die Stromkreiselemente umfassen für jeden der beiden Stromkreise jeweils ein feststehendes Kontaktelement 1, welches jeweils einteilig mit einem Anschlußelement 3 ausgebildet und zu diesem senkrecht abgebogen ist. Diesen feststehenden Kontaktelementen 1 zugeordnet sind jeweils einseitig eingespannte Kontaktfedern 5 aus Blattfedermetall vorgesehen, welche jeweils ein Kontaktstück 7 an ihrem freien Ende tragen. Jede Kontaktfeder 5 ist an ihrem entgegengesetzten Ende in herkömmlicher Weise an einem Schutzschalter-Rahmen 9 aus Isolierstoff befestigt. In entspannter Lage hält die jeweilige Kontaktfeder 5 ihr Kontaktstück 7 oberhalb und getrennt von dem zugehörigen feststehenden Kontaktelement 1 und halt damit den entsprechenden Stromkreis geöffnet.The internal structure of a two-pole overcurrent circuit breaker will now be described with reference to FIGS. 1 and 2. For each of the two circuits, the circuit elements each comprise a fixed contact element 1, which is formed in one piece with a connection element 3 and is bent perpendicular to the latter. Associated with these fixed contact elements 1 are contact springs 5 made of leaf spring metal which are clamped on one side and each carry a contact piece 7 at their free end. Each contact spring 5 is attached at its opposite end in a conventional manner to a circuit breaker frame 9 made of insulating material. In a relaxed position, the respective contact spring 5 holds its contact piece 7 above and separate from the associated fixed contact element 1 and thus keeps the corresponding circuit open.

Flexible Leiter bzw. Litzen 11 sind jeweils mit einem Ende nahe an dem Punkt der Kontaktfedern 5 befestigt, wo diese mit dem Rahmen 9 verbunden sind. Der Befestigungsbereich für die jeweilige Litze 11 kann ein Abschnitt des Federmaterials sein, welcher winkelig von dem Befestigungsbereich der jeweiligen Kontaktfeder 5 abgebogen ist. Jede Litze 11 ist mit ihrem entgegengesetzten Ende jeweils an einem Ende eines entsprechenden Bimetallstreifens 13 befestigt, welcher aus zwei oder mehr unterschiedlichen metallischen Materialien besteht. Diese metallischen Materialien besitzen unterschiedliche thermische Ausdehnungskoeffizienten. Die dem jeweiligen Litzenanschluß entgegengesetzten Enden der beiden Bimetallstreifen 13 sind unter einem Winkel mit entsprechenden Lastanschlußelementen 15 verbunden. Sowohl die Bimetallstreifen 13 als auch die Lastanschlußelemente 15 sind mit dem Rahmen 9 so verriegelt, daß die Lastanschlußelemente 15 durch den Boden des Rahmens 9 ragen. Aufgrund dieser beschriebenen Konstruktion wird erreicht, daß bei Erhitzung eines der Bimetallstreifens 13, beispielsweise im Verlauf einer Überlastbedingung, die Unterschiede zwischen den thermischen Ausdehnungskoeffizienten der Materialien des Bimetallstreifens 13 das freie Ende des erhitzten Bimetallstreifens veranlassen, sich zu biegen bzw. sich in einer bogenförmigen Weise zu bewegen.Flexible conductors or strands 11 are each fastened at one end close to the point of the contact springs 5 where they are connected to the frame 9. The fastening area for the respective strand 11 can be a section of the spring material be which is bent at an angle from the fastening area of the respective contact spring 5. Each strand 11 is fastened at its opposite end to one end of a corresponding bimetal strip 13, which consists of two or more different metallic materials. These metallic materials have different coefficients of thermal expansion. The ends of the two bimetal strips 13 opposite the respective strand connection are connected at an angle to corresponding load connection elements 15. Both the bimetallic strips 13 and the load connection elements 15 are locked to the frame 9 such that the load connection elements 15 protrude through the bottom of the frame 9. Because of the construction described, it is achieved that when one of the bimetal strips 13 is heated, for example in the course of an overload condition, the differences between the thermal expansion coefficients of the materials of the bimetal strip 13 cause the free end of the heated bimetal strip to bend or to curve in an arcuate manner to move.

Direkt benachbart zu den Bimetallstreifen 13 und in geringem Abstand von diesen ist eine gemeinsame Sperrklinke 17 angeordnet. Diese Sperrklinke 17 besitzt eine zylindrische Oberfläche 19 in Form einer Querachse, welche in eine Lagerausnehmung 21 im Rahmen 9 mit teilweise kreisförmiger Wandung einschnappbar ist. Die kreisbogenförmige Lagerausnehmung 21 erstreckt sich mit ihrer zylindrischen Wand über einen Winkel von mehr als 180° und besitzt eine Öffnung, welche dem Durchmesser der zylindrischen Oberfläche bzw. der Querachse 19 entspricht. Da der offene Spalt der teilweise runden Lagerausnehmung 21 und die zylindrische Oberfläche der Querachse gleich sind, ist eine Überschneidung der Teile in der Weise vorgesehen, daß die zylindrische Oberfläche bzw. Querachse 19 in die runde Lagerausnehmung 21 eingedrückt bzw. eingeschnappt werden muß. Die runde Lagerausnehmung 21 wird zunächst aufgeweitet, um die zylindrische Oberfläche bzw. Querachse 19 aufzunehmen und nimmt dann ihre ursprüngliche Position oder Form wieder ein, wobei sie die zylindrische Oberflache bzw. Querachse festhält, jedoch deren freie Drehbewegung innerhalb der Lagerausnehmung 21 ermöglicht. Wenn also die Sperrklinke 17 einer äußeren Kraft unterworfen wird, kann sie über die zylindrische Oberfläche bzw. Querachse 19 frei schwenken. Die Aufweitung der Lagerausnehmung 21 zum Einsetzen der Querachse 19 der Sperrklinke wird bevorzugt in der Weise ermöglicht, daß der offene Abschnitt der Lagerausnehmung 21 durch eine federnd deformierbare Rastzunge 22 begrenzt ist, welche am Rahmen angeformt ist, das Einschnappen der Sperrklinke mit ihrer Querachse 19 ermöglicht und nach dem Einschnappen der Sperrklinke die Lagerausnehmung 21 wieder verschließt.A common pawl 17 is arranged directly adjacent to and at a short distance from the bimetal strips 13. This pawl 17 has a cylindrical surface 19 in the form of a transverse axis, which can be snapped into a bearing recess 21 in the frame 9 with a partially circular wall. The circular arc-shaped bearing recess 21 extends with its cylindrical wall over an angle of more than 180 ° and has an opening which corresponds to the diameter of the cylindrical surface or the transverse axis 19. Since the open gap of the partially round bearing recess 21 and the cylindrical surface of the transverse axis are the same, an overlap of the parts is provided in such a way that the cylindrical surface or transverse axis 19 must be pressed or snapped into the round bearing recess 21. The round bearing recess 21 is first widened to accommodate the cylindrical surface or transverse axis 19 and then takes its original position or shape again, holding the cylindrical surface or transverse axis, but allowing its free rotation within the bearing recess 21. If the pawl 17 is subjected to an external force, it can pivot freely over the cylindrical surface or transverse axis 19. The widening of the bearing recess 21 for inserting the transverse axis 19 of the pawl is preferably made possible in such a way that the open section of the bearing recess 21 is limited by a resiliently deformable latching tongue 22 which is formed on the frame and enables the pawl to snap in with its transverse axis 19 and after snapping the pawl, the bearing recess 21 closes again.

Die gemeinsame Sperrklinke 17 besitzt einen oberen Abschnitt 23 und einen unteren Abschnitt 25. Der untere Abschnitt 25 gelangt mit einem Verriegelungsabschnitt 26 eines Nockenhebels 27 in und außer Eingriff, was später noch beschrieben wird. Der obere Abschnitt 23 der Sperrklinke 17 wird durch eine Druckfeder 29 in seine Ruhestellung vorgespannt. In dieser Position kann er in Eingriff mit den Bimetallstreifen 13 gelangen, wenn diese erwärmt werden und sich entsprechend in Richtung auf den oberen Abschnitt 23 der Sperrklinke biegen. Die von den Bimetallstreifen 13 auf den oberen Abschnitt 23 der Sperrklinke ausgeübte Kraft veranlaßt die Sperrklinke 17 zu einem Verschwenken innerhalb der Lagerausnehmung 21. Wenn andererseits die von den Bimetallstreifen 13 ausgeübte Kraft entfällt, wenn also die Bimetallstreifen abgekühlt sind und in ihren ursprünglichen Zustand zurückgekehrt sind, dann wird die Sperrklinke durch die Druckfeder 29 in ihre Anfangsposition zurückgestellt. Die Druckfeder 29 ist zwischen dem Rahmen 9 und dem oberen Abschnitt 23 der Sperrklinke auf herkömmliche Weise angeordnet und befestigt. Auch wenn die Sperrklinke nach einer Auslösung in ihren Anfangszustand zurückgestellt wird, behält der Nockenhebel seinen ausgelösten Zustand bei, bis er wieder manuell in seinen Einschaltzustand gebracht wird, was später noch genauer beschrieben werden wird.The common pawl 17 has an upper portion 23 and a lower portion 25. The lower portion 25 engages and disengages with a locking portion 26 of a cam lever 27, which will be described later. The upper section 23 of the pawl 17 is biased into its rest position by a compression spring 29. In this position, it can engage the bimetallic strips 13 when they are heated and bend accordingly towards the upper section 23 of the pawl. The force exerted by the bimetallic strips 13 on the upper section 23 of the pawl causes the pawl 17 to pivot within the bearing recess 21. On the other hand, when the force exerted by the bimetallic strips 13 ceases to exist, that is to say when the bimetallic strips have cooled down and have returned to their original state , then the pawl is returned to its initial position by the compression spring 29. The compression spring 29 is arranged and fixed between the frame 9 and the upper section 23 of the pawl in a conventional manner. Even if the pawl is reset to its initial state after tripping, the cam lever remains in its tripped state until it is manually switched back to its on state brought, which will be described in more detail later.

Der Rahmen 9 besitzt zur Halterung einer Schaltwippe 33 eine Lagerstütze 30 und an dieser beiderseits je einen zylindrischen Lagerzapfen 31; auf diesen Lagerzapfen rastet die Schaltwippe 33 mit in gegenüberliegenden Seitenwänden 38 eingeformten Lagerausnehmungen 35 ein. Nach dem Einrasten der Schaltwippe 33 auf den Lagerzapfen 31 dienen die Ausnehmungen 35 als Schwenkachse für die Schaltwippe für deren Bewegungen zwischen einer Einschalt- und einer Ausschaltposition. Die teils kreisförmig ausgeschnittenen Lagerausnehmungen 35 in den Seitenwänden 38 der Schaltwippe besitzen jeweils eine offene Seite, welche durch eine flexible, einseitig befestigte Zunge 37 weitgehend geschlossen wird. Diese Zunge 37 in jeder der beiden Seitenwände 38 der Schaltwippe ist durch Schlitze in den Seitenwänden gebildet, welche sich jeweils bis in die Nähe einer Abschlußkante dieser jeweiligen Seitenwand erstrecken. Beim Aufsetzen der Schaltwippe auf die Lagerzapfen 31 können sich somit die Zungen 37 nach außen verbiegen und das Einrasten der Lagerzapfen in die Lagerausnehmungen 35 ermöglichen. Auf der Innenseite der Seitenwände 38 ist zudem jeweils eine Nut 40 ausgebildet, welche beim Aufsetzen der Schaltwippe jeweils einen Lagerzapfen 31 aufnimmt und in Richtung auf die Lagerausnehmung 35 führt. Beim Aufsetzen der Schaltwippe laufen die Lagerzapfen also innerhalb der beiden Nuten 40 und drücken dabei gleichzeitig die flexiblen Zungen 37 nach außen, bis die Lagerzapfen 31 in die Lagerausnehmungen 35 eingerastet sind. Die flexiblen Zungen 37 federn dann in ihre Ausgangsposition zurück und halten die Lagerzapfen 31 in den kreisförmigen Lagerausnehmungen 35 und bilden dabei Lagerflächen für die Lagerzapfen 31, wenn die Schaltwippe sich bei der Bewegung zwischen Einschalt- und Ausschaltposition um diese Lagerzapfen dreht. Damit ist die Montage der Schaltwippe 33 auf dem Rahmen 9 einfach und genau, ohne daß sie irgendwelche zusätzlichen Stifte, Nieten, Schrauben oder sonstige Befestigungselemente erfordert. Die Schaltwippe ist ein einziges Formteil, welches aus undurchsichtigem oder transparentem Kunststoff gefertigt sein kann. Die Figuren 3 und 4 zeigen eine Detailansicht der Einrastanordnung für die Schaltwippe.The frame 9 has a bearing support 30 for holding a rocker switch 33 and a cylindrical bearing journal 31 on both sides thereof; the rocker switch 33 engages on these journals with bearing recesses 35 formed in opposite side walls 38. After the switching rocker 33 has snapped into place on the bearing journal 31, the recesses 35 serve as a pivot axis for the switching rocker for its movements between a switch-on and a switch-off position. The partially circularly cut-out bearing recesses 35 in the side walls 38 of the rocker switch each have an open side, which is largely closed by a flexible tongue 37 fastened on one side. This tongue 37 in each of the two side walls 38 of the rocker switch is formed by slots in the side walls, which each extend up to the vicinity of an end edge of this respective side wall. When the rocker switch is placed on the bearing journal 31, the tongues 37 can thus bend outwards and enable the bearing journal to snap into the bearing recesses 35. On the inside of the side walls 38 there is also a groove 40, which receives a bearing journal 31 when the switching rocker is attached and leads in the direction of the bearing recess 35. When the rocker switch is placed on it, the journals run within the two grooves 40 and at the same time press the flexible tongues 37 outward until the journals 31 are engaged in the bearing recesses 35. The flexible tongues 37 then spring back into their starting position and hold the journals 31 in the circular bearing recesses 35 and thereby form bearing surfaces for the journals 31 when the rocker switch rotates around these journals during the movement between the switch-on and switch-off positions. Thus, the assembly of the rocker switch 33 on the frame 9 is simple and accurate, without requiring any additional pins, rivets, screws or other fasteners. The rocker switch is a single molded part, which can be made of opaque or transparent plastic. Figures 3 and 4 show a detailed view of the locking arrangement for the rocker switch.

Die Schaltwippe 33 ist mit dem Nockenhebel 27 über beiderseits angebrachte Kopplungsarme 39 zur Übertragung der Schaltbewegung verbunden. Die Kopplungsarme 39 besitzen jeweils an ihrem einen Ende einen konisch abgeschrägten und geschlitzten Wippen-Schwenkzapfen 41, welcher durch eine entsprechende runde Öffnung 43 in der Schaltwippe 33 gesteckt ist. Beim Einstecken der Schwenkzapfen 41 in die Öffnungen 43 werden die geschlitzten Abschnitte zusammengedrückt. Nach dem Einstecken federn diese geschlitzten Abschnitte wieder auseinander und verriegeln sich, beispielsweise mit vorstehenden Schultern oder dergleichen, an der Innenseite der Seitenwände 38 im Bereich der Öffnungen 43; damit werden die Schwenkzapfen 41 festgehalten, ermöglichen aber ein Verschwenken der Kopplungsarme 39 relativ zur Schaltwippe 33.The rocker switch 33 is connected to the cam lever 27 via coupling arms 39 attached on both sides for transmitting the switching movement. The coupling arms 39 each have at one end a tapered and slotted rocker pivot pin 41 which is inserted through a corresponding round opening 43 in the rocker switch 33. When the pivot pin 41 is inserted into the openings 43, the slotted sections are pressed together. After insertion, these slotted sections spring apart again and lock, for example with projecting shoulders or the like, on the inside of the side walls 38 in the region of the openings 43; the pivot pins 41 are thus held in place, but allow the coupling arms 39 to pivot relative to the rocker switch 33.

Die Kopplungsarme 39 besitzen jeweils am gegenüberliegenden Ende zu den Wippen-Schwenkzapfen 41 einen Nockenhebel-Schwenkzapfen 45. Diese zylindrischen Schwenkzapfen 45 ragen durch entsprechende Öffnungen 47 in dem Nockenhebel 27 und darüber hinaus in eine Nut 49 im Rahmen 9. Diese Nuten 49 an beiden Seiten des Rahmens 9 erstrecken sich in Schaltrichtung von der Schaltwippe in Richtung auf die beweglichen Kontaktfedern 5, und die Bewegung der Nockenhebel-Schwenkzapfen 45 in den Nuten 49 bewirkt einen Schaltweg, welcher den Schaltteil des Schutzschalters betätigt. Zugleich wirken die Nockenhebel-Schwenkzapfen 45 als Lagerachsen für den Nockenhebel 27. Die Kopplungsarme 39 besitzen im dargestellten Ausführungsbeispiel außerdem jeweils einen Absatz 50 in einem bestimmten Abstand von dem jeweiligen Wippen-Schwenkzapfen 41; auf diesem Absatz 50 kann jeweils die bogenförmige Kante 51 der jeweiligen Seitenwand 38 der Schaltwippe abrollen.The coupling arms 39 each have a cam lever pivot pin 45 at the opposite end to the rocker pivot pins 41. These cylindrical pivot pins 45 project through corresponding openings 47 in the cam lever 27 and beyond into a groove 49 in the frame 9. These grooves 49 on both sides of the frame 9 extend in the switching direction from the rocker switch in the direction of the movable contact springs 5, and the movement of the cam lever pivot pin 45 in the grooves 49 causes a switching path which actuates the switching part of the circuit breaker. At the same time, the cam lever pivot pins 45 act as bearing axles for the cam lever 27. In the exemplary embodiment shown, the coupling arms 39 also each have a shoulder 50 at a certain distance from the respective rocker pivot pin 41; The arcuate edge 51 of the respective side wall 38 of the rocker switch can roll on this shoulder 50.

Der Nockenhebel 27 ist gabelförmig gespalten und umfaßt so mit zwei Betätigungsarmen 28 die Lagerstütze für die Schaltwippe 33. Mit den Enden der Betätigungsarme 28 wird die von der Schaltwippe 33 über die Kopplungsarme 39 übertragene Schaltkraft auf die Kontaktfedern 5 ausgeübt.The cam lever 27 is split in a fork shape and thus includes the bearing support for the rocker switch 33 with two actuating arms 28. With the ends of the actuating arms 28, the switching force transmitted from the rocker switch 33 via the coupling arms 39 is exerted on the contact springs 5.

Um die Schaltwippe 33 in die Ausschaltposition vorzuspannen, ist eine Feder 53 zwischen der Schaltwippe und dem Rahmen 9 angeordnet. Hierzu besitzt der Rahmen 9 eine Federauflage 55 mit einem gekrümmten Vorsprung 57, welcher sich annähernd entlang der kreisförmigen Bewegungsrichtung des einen beweglichen Endes 34 der Schaltwippe 33 nach oben erstreckt. Entsprechend besitzt die Schaltwippe einen Gabelfortsatz 59, welcher sich an dem Ende 34 nach außen erstreckt und mit seinen zwei Armen den Vorsprung 57 umfaßt. Der gekrümmte Vorsprung 57 erstreckt sich also durch den Gabelfortsatz 59 und bildet somit eine Führung für die Schaltwippe 33, wen diese zwischen ihrer Einschalt- und ihrer Ausschaltposition verschwenkt wird. Zusätzlich dient der Gabelfortsatz 59 auch als obere Abstützung für die Feder 53. Deshalb werden der Gabelfortsatz 59 und der gekrümmte Vorsprung 57 bereits bei der Montage der Schaltwippe 33 benutzt, um diese zu führen und auf ihrer Lagerung zu zentrieren, und nachfolgend dienen sie auch dazu, die Feder 53 an ihrem Platz und in ihrer langgestreckt-gekrümmten Form zu halten. Der Gabelfortsatz 59 kann an seiner Unterseite zusätzlich einen in Figur 1 angedeuteten Zapfen 58 aufweisen, der in die Feder 53 eingreift, um zusätzlich die Stabilität der Halterung und Führung für die Feder zu verbessern.In order to bias the rocker switch 33 into the switch-off position, a spring 53 is arranged between the rocker switch and the frame 9. For this purpose, the frame 9 has a spring support 55 with a curved projection 57, which extends approximately along the circular direction of movement of the one movable end 34 of the rocker switch 33. Accordingly, the rocker switch has a fork extension 59, which extends outward at the end 34 and comprises the projection 57 with its two arms. The curved projection 57 thus extends through the fork extension 59 and thus forms a guide for the rocker switch 33 when it is pivoted between its switch-on and switch-off positions. In addition, the fork extension 59 also serves as an upper support for the spring 53. Therefore, the fork extension 59 and the curved projection 57 are already used during the assembly of the rocker switch 33 to guide it and center it on its mounting, and subsequently they also serve this purpose to hold the spring 53 in place and in its elongated-curved shape. The fork extension 59 can additionally have on its underside a pin 58, indicated in FIG. 1, which engages in the spring 53 in order to additionally improve the stability of the holder and guide for the spring.

Der Schutzschalter besitzt weiterhin zwei Justierschrauben 60, welche jeweils einem der Bimetallstreifen 13 entsprechen und zugeordnet sind. Der Abstand zwischen den Bimetallstreifen 13 und der gemeinsamen Sperrklinke 17 bestimmt, wieviel sich die Bimetallstreifen biegen müssen, um die gemeinsame Sperrklinke 17 zu berühren. Das Ausmaß der Biegung der Bimetallstreifen 13 ist eine Funktion des an ihnen anliegenden Stromes. Entsprechend kann durch den Einsatz der Justierschrauben 60 in Verbindung mit den im Rahmen festgeklemmten Muttern 62 zum Zweck der Einstellung des Winkelabstandes zwischen den Bimetallstreifen 13 und der gemeinsamen Sperrklinke 17 der für die Überlastbedingung erforderliche Abstand eingestellt werden. Der Schutzschalter mit Schaltwippe kann weiterhin eine Miniaturlampe 61 enthalten, welche auf einer Auflagefläche 63 im Rahmen 9 angeordnet ist. In diesem Fall verbinden Anschlußdrähte 65 die Miniaturlampe mit den Lastanschlüssen 15. In den Lampenkreis wird zweckmäßigerweise ein nicht dargestellter Widerstand eingeschaltet, um den Strom über die Lampe zu begrenzen.The circuit breaker also has two adjusting screws 60, each of which corresponds to one of the bimetal strips 13 and is assigned. The distance between the bimetallic strips 13 and the common pawl 17 determines how much the bimetallic strips have to bend to touch the common pawl 17. The extent to which the bimetallic strips 13 bend is a function of that which bears against them Current. Accordingly, by using the adjusting screws 60 in connection with the nuts 62 clamped in the frame for the purpose of adjusting the angular distance between the bimetallic strips 13 and the common pawl 17, the distance required for the overload condition can be set. The circuit breaker with rocker switch can also contain a miniature lamp 61, which is arranged on a support surface 63 in the frame 9. In this case, connecting wires 65 connect the miniature lamp to the load connections 15. A resistor (not shown) is expediently switched into the lamp circuit in order to limit the current through the lamp.

Wahlweise kann für bestimmte Anwendungsfälle auch ein Hilfsschalter 67 zusätzlich in dem Rahmen 9 befestigt werden; hierzu besitzt der Rahmen seitlich vorspringende zylindrische Haltestifte 69, welche in entsprechende Haltelöcher 71 in dem Hilfsschalter 67 eingreifen. Der Rahmen 9 umfaßt in einer Ausnehmung den Hilfsschalter 67 von drei Seiten. Ein Hebel 73, der im Rahmen 9 gefesselt ist, betätigt den Hilfsschalter 67, wenn er entsprechend einer Bewegung der Kontaktfedern 5 während deren Betätigung durch die Schaltwippe 33 in ihre Ein- oder Ausschaltstellung bewegt wird.Optionally, an auxiliary switch 67 can also be additionally fastened in the frame 9 for certain applications; for this purpose the frame has laterally projecting cylindrical retaining pins 69 which engage in corresponding retaining holes 71 in the auxiliary switch 67. The frame 9 comprises the auxiliary switch 67 from three sides in a recess. A lever 73, which is tied up in the frame 9, actuates the auxiliary switch 67 when it is moved in accordance with a movement of the contact springs 5 during their actuation by the rocker switch 33 into its on or off position.

Eine Kappe 75 besitzt einen oberen Flanschteil 77 mit einer rechtwinkeligen Öffnung 78, durch welche die Schaltwippe 33 greift. Die Kappe 75 ist an der Unterseite offen, so daß der gesamte Schutzschaltermechanismus in die Kappe eingesteckt werden kann. Die Kappe 75 wird durch das Eingreifen von abgeschrägten Vorsprüngen 79 in entsprechende Öffnungen 81 in der Seitenwand 83 der Kappe 75 in der montierten Position gehalten. Zusätzlich wird die Kappe 75 durch Anschläge gesichert, welche durch ineinandergreifende Teile des Rahmens 9 und der Kappe 75 gebildet werden.A cap 75 has an upper flange part 77 with a right-angled opening 78 through which the rocker switch 33 engages. The cap 75 is open at the bottom so that the entire circuit breaker mechanism can be inserted into the cap. The cap 75 is held in the assembled position by the engagement of chamfered projections 79 in corresponding openings 81 in the side wall 83 of the cap 75. In addition, the cap 75 is secured by stops which are formed by interlocking parts of the frame 9 and the cap 75.

Die Kappe 75 besitzt weiterhin eine Rastbefestigungseinrichtung, welche es ermöglicht, die Kappe mit einer Schalttafel (nicht dargestellt) in Eingriff zu bringen. Die Rastbefestigungseinrichtung besteht aus flexiblen Armen 85, welche sich von dem Flanschabschnitt 73 nach unten (Figur 2) oder von einer Seitenwand der Kappe nach oben (Figur 1) erstrecken. Sie besitzen sägezahnförmige Einkerbungen 87, welche hinter Flanschabschnitten einer Schalttafel einrasten. Die flexiblen Arme könnten auch über die Breite des Schutzschalters hinausstehen, um bei der Zentrierung des Schutzschalters in einem Ausschnitt der Schalttafel zu helfen.The cap 75 also has a snap fastening device, which makes it possible to mount the cap with a control panel (not shown) to engage. The latching fastening device consists of flexible arms 85 which extend downward from the flange section 73 (FIG. 2) or upward from a side wall of the cap (FIG. 1). They have sawtooth-shaped notches 87, which engage behind flange sections of a control panel. The flexible arms could also protrude the width of the circuit breaker to help center the circuit breaker in a cutout in the panel.

Um die Funktion des Schutzschalters besser zu verstehen, wird diese nunmehr anhand der Figuren 5 bis 8 näher erläutert.In order to better understand the function of the circuit breaker, it will now be explained in more detail with reference to FIGS. 5 to 8.

Figur 5 zeigt die Schutzschalterteile in der Ausschaltposition. Diese Position ergibt sich dann, wenn die Schaltwippe manuell in die Ausschaltstellung gebracht wird oder wenn der Schutzschalter durch die Erwärmung eines der Bimetallstreifen 13 und dessen Bewegung gegen die Sperrklinke 17 ausgelöst hat und entsprechend die Sperrklinke 17 nach Abkühlung des Bimetallstreifens durch die Druckfeder 53 in ihre Normalposition zurückgebracht wurde. Die Kontaktfedern 5 befinden sich in geöffneter Position, so daß die Nockenhebel-Schwenkzapfen 45 in dem oberen Abschnitt der Führungsnut 49 stehen und der Verriegelungsabschnitt 26 des Nockenhebels 27 mit dem unteren Abschnitt 25 der gemeinsamen Sperrklinke 17 in Eingriff ist. Alle Teile werden durch die Wippen-Rückstellfeder 53 in ihrer Stellung gehalten.Figure 5 shows the circuit breaker parts in the off position. This position results when the rocker switch is manually brought into the off position or when the circuit breaker has been triggered by the heating of one of the bimetal strips 13 and its movement against the pawl 17 and, accordingly, the pawl 17 after the bimetal strip has cooled by the compression spring 53 in it Normal position was returned. The contact springs 5 are in the open position so that the cam lever pivot pins 45 are in the upper section of the guide groove 49 and the locking section 26 of the cam lever 27 is in engagement with the lower section 25 of the common pawl 17. All parts are held in position by the rocker return spring 53.

Figur 6 zeigt den Schutzschalter in der Einschaltposition. Die Schaltwippe 33 wird hierzu in die Einschaltstellung gedrückt, was ein Ende des Kopplungsarmes 39 über einen Winkel in eine Übertotpunktlage gegenüber der geführten Position des anderen Endes mit dem Nockenhebel-Schwenkzapfen 45 bringt. Der untere Abschnitt der gemeinsamen Sperrklinke 17 ist mit dem Verriegelungsabschnitt 26 des Nockenhebels 27 in Eingriff, was den Nockenhebel 27 dazu veranlaßt, die Kontaktfedern 5 in die Schließposition zu bringen und dabei die Schaltkreise zu schließen, also Strom von den feststehenden Kontaktstücken 1 durch die Kontaktstücke 7, die Kontaktfedern 5, die Litzen 11, die Bimetallstreifen 13 zu dem jeweiligen Lastanschlußelement 15 fließen zu lassen.Figure 6 shows the circuit breaker in the on position. For this purpose, the rocker switch 33 is pressed into the switched-on position, which brings one end of the coupling arm 39 through an angle to an over-center position relative to the guided position of the other end with the cam lever pivot pin 45. The lower portion of the common pawl 17 is engaged with the locking portion 26 of the cam lever 27, which causes the cam lever 27 to bring the contact springs 5 into the closed position while doing so To close circuits, so to let current flow from the fixed contact pieces 1 through the contact pieces 7, the contact springs 5, the strands 11, the bimetallic strips 13 to the respective load connection element 15.

Wenn ein Überstrom auftritt, biegt sich der Bimetallstreifen 13 in Richtung auf den oberen Abschnitt 23 der gemeinsamen Sperrklinke 17, und nachdem er mit ihr in Berührung gelangt ist, übt er eine genügende Kraft auf sie aus, um den unteren Abschnitt 25 der gemeinsamen Sperrklinke 17 von dem Verriegelungsabschnitt 26 des Nockenhebels 27 zu lösen. Das ermöglicht eine Schwenkung des Verriegelungsabschnittes 26 des Schalthebels 27 und damit eine Aufhebung der Haltekraft, welche durch die Übertotpunktstellung der Schaltwippe 33 ausgeübt wurde. Die Rückstellfeder 53 bringt die Schaltwippe 33 in die Ausschaltposition. Die Auslöseposition ist in Figur 7 gezeigt.When an overcurrent occurs, the bimetallic strip 13 bends toward the upper portion 23 of the common pawl 17 and, after contacting it, exerts sufficient force on the lower portion 25 of the common pawl 17 to be released from the locking section 26 of the cam lever 27. This enables the locking section 26 of the shift lever 27 to be pivoted and thus a release of the holding force which was exerted by the over-center position of the rocker switch 33. The return spring 53 brings the rocker switch 33 into the off position. The trigger position is shown in Figure 7.

Figur 8 zeigt den Schutzschalter in einer Position, bei der die Schaltwippe 33 in der Einschaltstellung festgehalten wird. Dieser Zustand wird als Auslöse-Freiposition bezeichnet.Figure 8 shows the circuit breaker in a position in which the rocker switch 33 is held in the ON position. This state is called the release free position.

Anstelle des beschriebenen zweipoligen Schutzschalters mit einer Ansprechmöglichkeit an beiden Polen könnte natürlich auch nur einer der Pole ansprechempfindlich sein. In diesem Fall würde einer der dargestellten Bimetallstreifen 13 entfernt, und die entsprechende Kontaktfeder würde entweder direkt oder über die Litze 11 mit dem zugehörigen Kontaktelement 1 verbunden.Instead of the described two-pole circuit breaker with a possibility of addressing at both poles, of course only one of the poles could be sensitive. In this case, one of the bimetallic strips 13 shown would be removed and the corresponding contact spring would be connected to the associated contact element 1 either directly or via the wire 11.

Claims (13)

  1. Protective circuit-breaker, which has the following features:
    - a frame (9) with a bearing support,
    - a switching rocker (33) which is supported so as to be pivotable on the bearing support (30),
    - at least one stationary contact element (1) fixed to the frame,
    - at least one movable contact spring (5), one end of which is fixed to the frame (9) and the second, movable end of which is opposite the stationary contact element (1),
    - at least one actuating member (27), which can transmit the position of the switching rocker to the movable contact spring (5),
    - a release mechanism (13, 17) for locking and releasing the actuating member (27), and
    - a helical restoring spring (53), which is supported on the frame (9) and the switching rocker (33) and prestresses the latter into a switched-off position,
    characterized in that the frame (9) has a rod-shaped projection (57), which extends under the one movable end (34) of the switching rocker (33) and is curved approximately in the shape of a circular arc, corresponding to the pivoting movement of the switching rocker (33), in that the switching rocker (33) has a forked extension (59) on the movable end (34) mentioned, which extension surrounds the projection (57) of the frame (9) during the switching movement, and in that the restoring spring (53) is seated on the projection (57) and is supported on the forked extension (59).
  2. Protective circuit-breaker according to Claim 1, characterized in that the switching rocker (33) is supported so as to be able to latch into place on bearing elements (31) of the frame (9).
  3. Protective circuit-breaker according to Claim 2, characterized in that the bearing support (30) has two oppositely protruding bearing journals (31), in that the switching rocker (33) has a bearing recess (35) in each of the opposite side walls (38), by means of which recess the said switching rocker is supported in each case on one of the bearing journals (31), and in that at least one of the side walls (38) of the switching rocker (33) has an elastically deformable section (37) in the region between the bearing recess (35) and the edge (51) of the said side wall, by means of which section the switching rocker can be pushed onto the associated bearing journal (31) and latched into place thereon.
  4. Protective circuit-breaker according to Claim 3, characterized in that the elastically deformable section in the side wall (38) of the switching rocker (33) in each case has the form of a resiliently deformable tongue (37), the free end of which bounds one side of the bearing recess (35).
  5. Protective circuit-breaker according to Claim 3 or 4, characterized in that the side walls (38) of the switching rocker each have on their inside a guide groove (40) running to the bearing recess (35).
  6. Protective circuit-breaker according to one of Claims 1 to 5, characterized in that use is made of a cam lever (27) as the actuating member, having an actuating section (28) resting on the respective contact spring and having a locking section (26) which can be supported on the release mechanism (13, 17), it being possible for the cam lever (27) to pivot in the central region about a cam spindle (45) which is parallel to the pivot axis of the switching rocker (33), and it being possible to displace the cam lever (27) by its cam spindle (45) through the switching rocker in the direction of the contact spring (5), and in that the release mechanism includes a detent pawl (17), which is supported in the frame so as to be able to pivot about a pawl spindle (19), which is parallel to the cam spindle (45), and is prestressed by spring force into a locking position in which it engages with the locking section (26) of the cam lever (27), whereas it releases the locking section (26) of the cam lever (27) when it pivots against the spring force.
  7. Protective circuit-breaker according to Claim 6, characterized in that the detent pawl (17) is supported by means of a cylindrical transverse spindle (19), so as to be able to perform a rotary movement, in a bearing recess (21) which is formed in the frame and has a partially cylindrical wall, the open side of the bearing recess (21) being protected by an elastic latching tongue (22).
  8. Protective circuit-breaker according to Claim 6 or 7, characterized in that, for transmitting the switching movement of the rocker (33) to the cam lever (27), a coupling arm (39) is provided at least on one side, which arm is rotatably supported by one of its ends, by means of a rocker pivot pin (41), in an eccentrically arranged actuating recess (43) of the switching rocker and is rotatably supported by its other end, by means of a cam pivot pin (45) in an axial recess (47) of the cam lever (27).
  9. Protective circuit-breaker according to Claim 8, characterized in that the rocker pivot pin (41) of the coupling arm (39) can be latched by a slotted end, extended in the form of a hook, into the actuating recess (43) of the switching rocker (33).
  10. Protective circuit-breaker according to Claim 8 or 9, characterized in that the cam pivot pin (45) of the coupling arm (39) engages through the axial recess (47) of the cam lever (27) into a guide groove (49) of the frame, which groove enables the cam spindle to be displaced in the direction of the contact spring.
  11. Protective circuit-breaker according to one of Claims 5 to 10, characterized in that two pairs of contacts having one stationary contact element (1) each and one movable contact spring each are arranged in the frame (9) on both sides of the bearing support (30), and in that the cam lever (27) has an actuating end which is split in the form of a fork, surrounds the bearing support (30) on both sides and acts with a respective actuating arm (28) on the two contact springs (5).
  12. Protective circuit-breaker according to one of Claims 1 to 11, characterized in that the switching rocker (33) is integral with transparent plastic walls and a hollow interior.
  13. Protective circuit-breaker according to Claim 12, characterized in that an indicator lamp (61), reaching into the interior of the switching rocker (33), is arranged on the frame (9).
EP92118774A 1991-11-18 1992-11-02 Protective circuit-breaker with rocker Expired - Lifetime EP0543208B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/792,523 US5223813A (en) 1991-11-18 1991-11-18 Circuit breaker rocker actuator switch
US792523 1991-11-18

Publications (2)

Publication Number Publication Date
EP0543208A1 EP0543208A1 (en) 1993-05-26
EP0543208B1 true EP0543208B1 (en) 1995-10-25

Family

ID=25157197

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92118774A Expired - Lifetime EP0543208B1 (en) 1991-11-18 1992-11-02 Protective circuit-breaker with rocker

Country Status (6)

Country Link
US (1) US5223813A (en)
EP (1) EP0543208B1 (en)
AT (1) ATE129596T1 (en)
CZ (1) CZ281279B6 (en)
DE (1) DE59204129D1 (en)
ES (1) ES2079769T3 (en)

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Also Published As

Publication number Publication date
US5223813A (en) 1993-06-29
CZ281279B6 (en) 1996-08-14
DE59204129D1 (en) 1995-11-30
CZ340792A3 (en) 1993-06-16
EP0543208A1 (en) 1993-05-26
ES2079769T3 (en) 1996-01-16
ATE129596T1 (en) 1995-11-15

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