EP0342133B1 - Operating mechanism for a miniature circuit breaker having a contact-welding indicator - Google Patents

Operating mechanism for a miniature circuit breaker having a contact-welding indicator Download PDF

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Publication number
EP0342133B1
EP0342133B1 EP19890420159 EP89420159A EP0342133B1 EP 0342133 B1 EP0342133 B1 EP 0342133B1 EP 19890420159 EP19890420159 EP 19890420159 EP 89420159 A EP89420159 A EP 89420159A EP 0342133 B1 EP0342133 B1 EP 0342133B1
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EP
European Patent Office
Prior art keywords
handle
lever
stop
contacts
operating mechanism
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
EP19890420159
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German (de)
French (fr)
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EP0342133A1 (en
Inventor
William Bartolo
Michel Lazareth
Patrick Rousset
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.)
Merlin Gerin SA
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Merlin Gerin SA
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Application filed by Merlin Gerin SA filed Critical Merlin Gerin SA
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/501—Means for breaking welded contacts; Indicating contact welding or other malfunction of the circuit breaker
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/501—Means for breaking welded contacts; Indicating contact welding or other malfunction of the circuit breaker
    • H01H2071/502—Means for breaking welded contacts; Indicating contact welding or other malfunction of the circuit breaker with direct contact between manual operator and welded contact structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
    • H01H71/526—Manual reset mechanisms which may be also used for manual release actuated by lever the lever forming a toggle linkage with a second lever, the free end of which is directly and releasably engageable with a contact structure

Definitions

  • Lockout of the circuit breaker can be carried out after forced actuation of the lever in the open position while the contacts are soldered.
  • Document DE-A-3,516,217 discloses a miniature circuit breaker equipped with a toggle mechanism and with cutting function.
  • the contact arm has a bearing surface arranged in abutment which blocks the end of the transmission link when the contacts are welded.
  • the lever remains in an intermediate position after passing the neutral position of the knee switch, and is stopped indirectly by the blocking of the knee switch.
  • the locking of the link by the stop is carried out at the level of the breakable mechanical connection, that is to say downstream of the lever of the toggle joint.
  • An elastic deformation of the latter is possible in the event of forced actuation of the lever, which can approach the open position. The risk of padlocking the lever in this position cannot be excluded, while the contacts are in the closed-welded state.
  • the object of the invention is to improve the function of disconnection and visible signaling of a miniature circuit breaker mechanism.
  • the mechanism according to the invention is characterized in that the stop for limiting the stroke of the handle is fixed directly to a support lever made of insulating material subject to the contact arm, that the support lever is articulated on a pivot of a plate rotary, and that the stopper cooperates in the intermediate position with a locking nose projecting from the base of the lever.
  • the presence of the direct stop between handle and movable contact safely indicates the soldering state of the contacts when the handle is in the stable intermediate position.
  • the handle is equipped with an indicator light allowing the apparent signaling of the opening of the circuit breaker when the handle arrives in the open position O after clearing the stop.
  • the sight glass is arranged on the periphery of the base between the blocking spout and the handle so as to be visible from the outside in said position O of opening through a hole for passage of the handle, formed in the front face. of the insulating housing, said indicator being on the other hand invisible when the lever is in the intermediate position S stable after soldering of the contacts.
  • the stop of the mechanism is located on an auxiliary lever arranged in a ratchet pivotally mounted on the pivot of the plate and of the support arm of the contact arm.
  • the mechanism 10 for controlling a miniature electric circuit breaker with molded insulating housing 12 is of the type described in French patent application No. 8708037 filed on 09.06.1987 by the applicant.
  • the mechanism 10 actuates a movable contact arm 14 whose free end carries a contact part cooperating with a fixed contact 18.
  • An orifice 20 is formed in the front face 22 of the housing 12 for the passage of a lever 24 mounted at limited pivoting on an axis 26 and movable between a closed position F ( Figure 1) in which the contacts 16, 18 are closed, and an open position O ( Figure 2) corresponding to the separation of the contacts 16, 18.
  • the joystick 24 is equipped with an internal base 27 coupled to a transmission link 28 to constitute a toggle device 30 whose articulation 32 on the base 27 is eccentric relative to the fixed axis 26 of the handle 24.
  • the lever 24 is urged in a trigometric direction towards the position O of opening by a return spring (not shown) integrated in the base 27.
  • the fixed contact 18 is secured to the carcass of the electromagnetic trip device of which only the striker 34 is shown in the figures.
  • the contact arm 14 is fixed to a support lever 36 made of insulating material, articulated on a pivot 38 of a rotary plate 40.
  • a trigger lever 42 controlled by the striker 34 of the electromagnetic trigger, and the bimetallic strip 44 of the thermal trigger, is pivotally mounted on an axis 46 carried by the plate 40 with a predetermined offset relative to the pivot 38.
  • a breakable mechanical link 48 is provided between the transmission link 28 and the plate 40 for driving the contact arm 14. In the locked position, the link 48 allows manual control of the mechanism 10 by the lever 24.
  • the trigger lever 42 is associated with a spring reminder (not shown) intended to ensure the automatic restoration of the mechanical link 48 when the lever 24 is actuated towards the open position, following a triggering of the mechanism 10 on fault.
  • the breakable mechanical link 48 comprises a hook 50 for hooking pivotally mounted on an axis 52 of the plate 40. Opposite the axis 52, the beak of the hook 50 cooperates in the locked position of the link 48 with a notch 54 retainer located on the upper arm of the trigger lever 42.
  • the transmission link 28 is coupled to the hook 50 at a point 56 of articulation capable of moving when triggered in an opening 58 of the plate 40.
  • the opening 58 is formed in a circular sector centered on the axis 52, and the articulation point 56 is located between the axis 52 and the spout of the hook 50 for attachment.
  • the link 48 constitutes a multiplier stage in the kinematic chain of the mechanism 10, allowing a reduction in the tripping force in source of the thermothermal release.
  • the bimetallic strip 44 of the thermal trip device cooperates with the trip lever 42 by means of a rotary slide 60 with unidirectional transmission.
  • the drawer 60 is formed by a bent lever having one end freely coupled to the lower arm of the trigger lever 42 at a point of articulation 62.
  • the curved intermediate part of the transmission lever is supported on a boss 64 of the trigger lever 42 of so as to drive the latter towards the position triggered during the deflection to the right of the bimetallic strip 44 in the event of an overload current flowing in the pole.
  • the drawer 60 constitutes a rigid kinematic connection between the bimetallic strip 44 and the trigger lever 42.
  • the absence of parasitic friction between the drawer 60 and the trigger lever 42 allows a significant reduction in the tripping force transmitted by the bimetallic strip 44.
  • the articulation point 62 is disposed between the boss 64 and the pivot axis 46 of the trigger lever 42.
  • the striker 34 of the electromagnetic trip device acts on the lower arm of the trip lever 42 to ensure the locking of the hook 50 for hooking by escaping the retaining notch 54.
  • the trigger lever 42 is thus moved to the triggered position in the trigometric direction, without any braking reaction from the thermal trigger drawer 60 which remains inactive thanks to the presence of the flexible connection with the bimetallic strip 44.
  • the support lever 36 of the contact arm 14 comprises a stop 70 for limiting the stroke of the lever 24 in the event of welding of the contacts 16, 18, said stop 70 being shaped as a transverse arm situated in the interval delimited by the toggle switch 30 and the electromagnetic trigger.
  • the abutment 70 is capable of cooperating with a blocking nose 72 projecting from the base 27 opposite the lever 24 relative to the pivot axis 26.
  • An indicator light 74 for visible indication of the opening of the circuit breaker is arranged on the base 27 in the vicinity of the articulation 32 of the toggle joint 30, so as to be visible from the outside of the housing 12 through the orifice 20 when the lever 24 arrives in the open position O, shown at FIG. 2.
  • the stop 70 and the locking nose 72 come directly from molding respectively with the insulating support lever 36 and the insulating base 27 of the lever 24.
  • circuit breaker control mechanism 10 The operation of the circuit breaker control mechanism 10 according to FIGS. 1 to 3 is as follows:
  • the stop 70 follows the pivoting movement of the contact arm 14 in anti-clockwise so as to disappear in front of the locking spout 72 of the base 27.
  • the release of the base 27 authorizes the total pivoting stroke of the lever 24 to the left until position O stable opening (see Figure 2), with visible signaling of the opening by the sight glass 74 visible through the orifice 20.
  • the toggle joint 30 is then in a second stable position with the articulation 32 located above the neutral.
  • the stop 70 for limiting the stroke of the lever 24 in the event of soldering of the contacts 16, 18 is arranged in this variant on an auxiliary lever 102 pivotally mounted on the pivot 38 of the plate 40 (not shown), and of the lever support 36 of the contact arm 14.
  • a compression spring 104 is interposed between respective bosses of the levers 102, 36, so as to urge the auxiliary lever 102 in the counterclockwise direction by pressing on a lug 105 integral with the support lever 36.
  • the auxiliary lever 102 is in engagement against the lug 105, and the stop 70 cooperates with the locking spout 72 of the base 27 for block the lever 24 in the intermediate position S after passing the neutral position of the toggle joint 30.
  • the auxiliary lever 102 and spring 104 assembly constitutes a locking pawl making it possible to avoid parasitic stops, and being shaped as a lever amplifier for locking the joystick 24.

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  • Breakers (AREA)

Description

L'invention est relative à un mécanisme de commande d'un disjoncteur électrique miniature à boîtier isolant renfermant une paire de contacts fixe et mobile , ledit contact étant porté par un bras de contact pivotant actionné par le mécanisme entre les positions de fermeture et d'ouverture des contacts, ledit mécanisme comportant :

  • une biellette de transmission agencée entre une liaison mécanique brisable et une manette, laquelle est équipée d'une embrase accouplée à la biellette de transmission pour former une genouillère dont l'axe d'articulation est excentré par rapport à l'axe de pivotement dela manette, cette dernière étant déplaçable entre deux positions extrêmes F et O correspondant respectivement à la fermeture et à l'ouverture des contacts,
  • un levier de déclenchement piloté en cas de défaut par le déclencheur vers une position déclenchée, entraînant la rupture de la liaison mécanique et le déclenchement automatique du mécanisme, indépendament de la manette,
  • un ressort de rappel sollicitant la manette vers la position O d'ouverture,
  • le bras de contact étant relié à une butée agencée pour stopper en cas de soudure des contacts, la manette dans une position intermédiaire S prédéterminée située entre les positions F de fermeture et O d'ouverture, la manette étant maintenue dans ladite position intermédiaire après le dépassement du point mort de la genouillère.
The invention relates to a control mechanism for a miniature electrical circuit breaker with an insulating housing containing a pair of fixed and movable contacts, said contact being carried by a pivoting contact arm actuated by the mechanism between the closed and closed positions. opening of the contacts, said mechanism comprising:
  • a transmission link arranged between a breakable mechanical connection and a lever, which is equipped with a flange coupled to the transmission link to form a toggle joint whose axis of articulation is eccentric relative to the pivot axis of the lever , the latter being movable between two extreme positions F and O corresponding respectively to the closing and the opening of the contacts,
  • a trigger lever piloted in the event of a fault by the trigger towards a triggered position, causing the mechanical link to break and the automatic triggering of the mechanism, independently of the lever,
  • a return spring urging the lever towards the open position O,
  • the contact arm being connected to a stop arranged to stop in the event of soldering of the contacts, the lever in a predetermined intermediate position S situated between the closed F and open O positions, the lever being held in said intermediate position after the passing the neutral point of the knee lifter.

Le mécanisme décrit dans le document FR -A-2605 454 est incapable d'indiquer l'état de soudure des contacts pouvant intervenir lors de coupures répétées de courants de court-circuit très importants. Un cadenassage du disjoncteur peut être effectué après actionnement forcée de la manette dans la position d'ouverture alors que les contacts sont soudés.The mechanism described in document FR -A-2605 454 is unable to indicate the state of soldering of the contacts which can occur during repeated cuts in very large short-circuit currents. Lockout of the circuit breaker can be carried out after forced actuation of the lever in the open position while the contacts are soldered.

La fonction de sectionnement et de signalisation apparente de l'ouverture des contacts est déjà connue dans les gros disjoncteurs multipolaires à boîtier isolant moulé, ayant des calibres supérieurs à 100 ampères. Le mécanisme est commun aux différents pôles, et est associé à un barreau de commutation s'étendant transversalement dans le boîtier pour déplacer les contacts mobiles de l'ensemble des pôles. En cas de soudure des contacts, l'actionnement de la poignée ou de la manette jusqu'à la position d'ouverture est impossible, car un dispositif de verrouillage interdit le mouvement poursuivi dans le sens de l'ouverture au delà d'une position intermédiaire. Cette position est néanmoins instable, et en cas de relâchement de la manette, cette dernière revient automatiquement en position fermée. Il en résulte alors une absence de signalisation de soudure des contacts.The function of disconnection and apparent signaling of the opening of the contacts is already known in large multi-pole circuit breakers with molded insulating casing, with ratings greater than 100 amps. The mechanism is common to the different poles, and is associated with a switching rod extending transversely in the housing to move the movable contacts of all the poles. In the event of soldering of the contacts, actuation of the handle or the lever up to the open position is impossible, since a locking device prevents the movement continued in the direction of opening beyond a position intermediate. However, this position is unstable, and if the handle is released, the handle automatically returns to the closed position. This then results in an absence of signaling of soldering of the contacts.

Le document DE-A-3.516.217 divulgue un disjoncteur miniature équipé d'un mécanisme à genouillère et à fonction de sectionnement. Le bras de contact comporte une surface d'appui agencée en butée qui bloque l'extrémité de la biellette de transmission lorsque les contacts sont soudés. La manette reste dans une position intermédiaire après passage du point mort de la genouillère, et est stoppée indirectement par le blocage de la genouillère. Le blocage de la biellette par la butée s'effectue au niveau de la liaison mécanique brisable, c'est-à-dire à l'aval de la manette de l'articulation de la genouillère. Une déformation élastique de cette dernière est possible en ce cas d'actionnement forcé de la manette, laquelle peut se rapprocher de la position d'ouverture. Le risque de cadenassage de la manette dans cette position n'est pas à exclure, alors que les contacts sont dans l'état fermé-soudé.Document DE-A-3,516,217 discloses a miniature circuit breaker equipped with a toggle mechanism and with cutting function. The contact arm has a bearing surface arranged in abutment which blocks the end of the transmission link when the contacts are welded. The lever remains in an intermediate position after passing the neutral position of the knee switch, and is stopped indirectly by the blocking of the knee switch. The locking of the link by the stop is carried out at the level of the breakable mechanical connection, that is to say downstream of the lever of the toggle joint. An elastic deformation of the latter is possible in the event of forced actuation of the lever, which can approach the open position. The risk of padlocking the lever in this position cannot be excluded, while the contacts are in the closed-welded state.

Selon le document DE -B- 1055 664, la présence d'une articulation entre le contact et la zone de blocage de l'organe d'actionnement ne permet pas d'obtenir un positionnement précis de la manette en cas d'actionnement forcé lors d'un soudage des contacts.According to document DE -B- 1055 664, the presence of an articulation between the contact and the blocking zone of the actuating member does not make it possible to obtain precise positioning of the lever in the event of forced actuation during welding of the contacts.

L'objet de l'invention consiste à améliorer la fonction de sectionnement et de signalisation apparente d'un mécanisme de disjoncteur miniature.The object of the invention is to improve the function of disconnection and visible signaling of a miniature circuit breaker mechanism.

Le mécanisme selon l'invention est caractérisé en ce que la butée de limitation de la course de la manette est fixée directement sur un levier support en matériau isolant assujetti au bras de contact, que le levier support est articulé sur un pivot d'une platine rotative, et que la butée coopère dans la position intermédiaire avec un nez de blocage faisant saillie de l'embase de la manette.The mechanism according to the invention is characterized in that the stop for limiting the stroke of the handle is fixed directly to a support lever made of insulating material subject to the contact arm, that the support lever is articulated on a pivot of a plate rotary, and that the stopper cooperates in the intermediate position with a locking nose projecting from the base of the lever.

La présence de la butée directe entre manette et contact mobile indique en toute sécurité l'état de soudure des contacts lorsque la manette se trouve dans la position intermédiaire stable.The presence of the direct stop between handle and movable contact safely indicates the soldering state of the contacts when the handle is in the stable intermediate position.

La manette est dotée d'un voyant autorisant la signalisation apparente de l'ouverture du disjoncteur lorsque la manette arrive dans la position O d'ouverture après effacement de la butée.The handle is equipped with an indicator light allowing the apparent signaling of the opening of the circuit breaker when the handle arrives in the open position O after clearing the stop.

Le voyant est agencé sur la périphérie de l'embase entre le bec de blocage et la manette de manière à être visible de l'extérieur dans ladite position O d'ouverture à travers un orifice de passage de la manette, ménagé dans la face avant du boîtier isolant, ledit voyant étant d'autre part invisible lorsque la manette se trouve dans la position intermédiaire S stable après soudure des contacts.The sight glass is arranged on the periphery of the base between the blocking spout and the handle so as to be visible from the outside in said position O of opening through a hole for passage of the handle, formed in the front face. of the insulating housing, said indicator being on the other hand invisible when the lever is in the intermediate position S stable after soldering of the contacts.

Selon un deuxième mode de réalisation, la butée du mécanisme se trouve sur un levier auxiliaire agencé en cliquet monté à pivotement sur le pivot de la platine et du levier support du bras de contact.According to a second embodiment, the stop of the mechanism is located on an auxiliary lever arranged in a ratchet pivotally mounted on the pivot of the plate and of the support arm of the contact arm.

D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre des modes de réalisations de l'invention, donnés à titre d'exemples non limitatifs, et représentés aux dessins annexés, dans lesquels:

  • La figure 1 est une vue schématique d'un mécanisme de commande de disjoncteur miniature, équipé d'un dispositif indicateur de soudure des contacts et de signalisation apparente de l'ouverture selon l'invention, le disjoncteur étant représenté en position de fermeture;
  • la figure 2 est une vue identique à la figure 1, en position d'ouverture du disjoncteur;
  • la figure 3 est une vue analogue à la figure 1, montrant le mécanisme dans l'état contacts soudés et manette bloquée, en position intermédiaire;
  • la figure 4 représente une variante de réalisation du mécanisme de la figure 1.
Other advantages and characteristics will emerge more clearly from the description which follows of embodiments of the invention, given by way of nonlimiting examples, and represented in the appended drawings, in which:
  • Figure 1 is a schematic view of a miniature circuit breaker control mechanism, equipped with a device for indicating soldering of contacts and apparent signaling of the opening according to the invention, the circuit breaker being shown in the closed position;
  • Figure 2 is a view identical to Figure 1, in the open position of the circuit breaker;
  • Figure 3 is a view similar to Figure 1 showing the mechanism in the welded contact state and locked handle, in the intermediate position;
  • FIG. 4 represents an alternative embodiment of the mechanism of FIG. 1.

Sur les figures 1 à 3, le mécanisme 10 de commande d'un disjoncteur électrique miniature à boîtier 12 isolant moulé est du type décrit dans la demande de brevet français n° 8708037 déposée le 09.06.1987 par la demanderesse.In FIGS. 1 to 3, the mechanism 10 for controlling a miniature electric circuit breaker with molded insulating housing 12 is of the type described in French patent application No. 8708037 filed on 09.06.1987 by the applicant.

Le mécanisme 10 actionne un bras de contact 14 mobile dont l'extrémité libre porte une pièce de contact coopérant avec un contact fixe 18. Un orifice 20 est ménagé dans la face avant 22 du boîtier 12 pour le passage d'une manette 24 montée à pivotement limité sur un axe 26 et déplaçable entre une position F de fermeture (figure 1) dans laquelle les contacts 16, 18 sont fermés, et une position O d'ouverture (figure 2) correspondant à la séparation des contacts 16, 18. La manette 24 est équipée d'une embase 27 interne accouplée à une biellette 28 de transmission pour constituer un dispositif à genouillère 30 dont l'articulation 32 sur l'embase 27 se trouve excentrée par rapport à l'axe 26 fixe de la manette 24.The mechanism 10 actuates a movable contact arm 14 whose free end carries a contact part cooperating with a fixed contact 18. An orifice 20 is formed in the front face 22 of the housing 12 for the passage of a lever 24 mounted at limited pivoting on an axis 26 and movable between a closed position F (Figure 1) in which the contacts 16, 18 are closed, and an open position O (Figure 2) corresponding to the separation of the contacts 16, 18. The joystick 24 is equipped with an internal base 27 coupled to a transmission link 28 to constitute a toggle device 30 whose articulation 32 on the base 27 is eccentric relative to the fixed axis 26 of the handle 24.

La manette 24 est sollicitée dans le sens trigométrique vers la position O d'ouverture par un ressort de rappel (non représenté) intégré dans l'embase 27. Le contact fixe 18 est solidarisé à la carcasse du déclencheur électromagnétique dont seul le percuteur 34 est représenté sur les figures. Le bras de contact 14 est fixé à un levier support 36 en matériau isolant, articulé sur un pivot 38 d'une platine 40 rotative.The lever 24 is urged in a trigometric direction towards the position O of opening by a return spring (not shown) integrated in the base 27. The fixed contact 18 is secured to the carcass of the electromagnetic trip device of which only the striker 34 is shown in the figures. The contact arm 14 is fixed to a support lever 36 made of insulating material, articulated on a pivot 38 of a rotary plate 40.

Un levier de déclenchement 42 piloté par le percuteur 34 du déclencheur électromagnétique, et la bilame 44 du déclencheur thermique, est monté à pivotement sur un axe 46 porté par la platine 40 avec un décalage prédéterminé par rapport au pivot 38.A trigger lever 42 controlled by the striker 34 of the electromagnetic trigger, and the bimetallic strip 44 of the thermal trigger, is pivotally mounted on an axis 46 carried by the plate 40 with a predetermined offset relative to the pivot 38.

Une liaison mécanique 48 brisable est ménagée entre la biellette de transmission 28 et la platine 40 d'entraînement du bras de contact 14. En position verrouillée, la liaison 48 autorise la commande manuelle du mécanisme 10 par la manette 24. Le déplacement du levier de déclenchement 42 vers la position déclenchée sous l'action du déclencheur thermique ou électromagnétique, provoque la rupture momentanée de la liaison mécanique 48, entraînant le déclenchement automatique du mécanisme 10, indépendamment de la manette 24. Le levier de déclenchement 42 est associé à un ressort de rappel (non représenté) destiné à assurer le rétablissement automatique de la liaison mécanique 48 lorsque la manette 24 est actionnée vers la position d'ouverture, suite à un déclenchement du mécanisme 10 sur défaut.A breakable mechanical link 48 is provided between the transmission link 28 and the plate 40 for driving the contact arm 14. In the locked position, the link 48 allows manual control of the mechanism 10 by the lever 24. The movement of the lever trigger 42 towards the triggered position under the action of the thermal or electromagnetic trigger, causes the momentary rupture of the mechanical link 48, causing the automatic triggering of the mechanism 10, independently of the lever 24. The trigger lever 42 is associated with a spring reminder (not shown) intended to ensure the automatic restoration of the mechanical link 48 when the lever 24 is actuated towards the open position, following a triggering of the mechanism 10 on fault.

La liaison mécanique 48 brisable comporte un crochet 50 d'accrochage monté à pivotement sur un axe 52 de la platine 40. A l'opposé de l'axe 52, le bec du crochet 50 coopère en position verrouillée de la liaison 48 avec un cran 54 de retenue situé sur le bras supérieur du levier de déclenchement 42.The breakable mechanical link 48 comprises a hook 50 for hooking pivotally mounted on an axis 52 of the plate 40. Opposite the axis 52, the beak of the hook 50 cooperates in the locked position of the link 48 with a notch 54 retainer located on the upper arm of the trigger lever 42.

La biellette de transmission 28 est accouplée au crochet 50 en un point 56 d'articulation susceptible de se déplacer lors du déclenchement dans une ouverture 58 de la platine 40. L'ouverture 58 est conformée en un secteur circulaire centré sur l'axe 52, et le point d'articulation 56 est situé entre l'axe 52 et le bec du crochet 50 d'accrochage. La liaison 48 constitue un étage démultiplicateur dans la chaîne cinématique du mécanisme 10, autorisant une réduction de l'effort de déclenchement en provenance du déclencheur magnétothermique.The transmission link 28 is coupled to the hook 50 at a point 56 of articulation capable of moving when triggered in an opening 58 of the plate 40. The opening 58 is formed in a circular sector centered on the axis 52, and the articulation point 56 is located between the axis 52 and the spout of the hook 50 for attachment. The link 48 constitutes a multiplier stage in the kinematic chain of the mechanism 10, allowing a reduction in the tripping force in source of the thermothermal release.

La bilame 44 du déclencheur thermique coopère avec le levier de déclenchement 42 au moyen d'un tiroir rotatif 60 à transmision unidirectionnelle. Le tiroir 60 est formé par un levier coudé ayant une extrémité accouplée librement au bras inférieur du levier de déclenchement 42 en un point d'articulation 62. La partie intermédiaire incurvée du levier de transmission prend appui sur un bossage 64 du levier de déclenchement 42 de manière à entraîner ce dernier vers la position déclenchée lors de la déflexion vers la droite de la bilame 44 en cas de circulation d'un courant de surcharge dans le pôle.The bimetallic strip 44 of the thermal trip device cooperates with the trip lever 42 by means of a rotary slide 60 with unidirectional transmission. The drawer 60 is formed by a bent lever having one end freely coupled to the lower arm of the trigger lever 42 at a point of articulation 62. The curved intermediate part of the transmission lever is supported on a boss 64 of the trigger lever 42 of so as to drive the latter towards the position triggered during the deflection to the right of the bimetallic strip 44 in the event of an overload current flowing in the pole.

Lors de la phase de déclenchement thermique, le tiroir 60 constitue une liaison cinématique rigide entre la bilame 44 et le levier de déclenchement 42. L'absence de frottement parasite entre le tiroir 60 et le levier de déclenchement 42 permet une diminution notable de l'effort de déclenchement transmis par la bilame 44. Le point d'articulation 62 est disposé entre le bossage 64 et l'axe 46 de pivotement du levier de déclenchement 42.During the thermal triggering phase, the drawer 60 constitutes a rigid kinematic connection between the bimetallic strip 44 and the trigger lever 42. The absence of parasitic friction between the drawer 60 and the trigger lever 42 allows a significant reduction in the tripping force transmitted by the bimetallic strip 44. The articulation point 62 is disposed between the boss 64 and the pivot axis 46 of the trigger lever 42.

En cas de déclenchement magnétique suite à un court-circuit, le percuteur 34 du déclencheur électromagnétique agit sur le bras inférieur du levier de déclenchement 42 pour assurer le verrouillage du crochet 50 d'accrochage par échappement du cran 54 de retenue. Le levier de déclenchement 42 est ainsi déplacé vers la position déclenchée dans le sens trigométrique, sans aucune réaction de freinage du tiroir 60 de déclenchement thermique qui reste inactif gràce à la présence de la liaison souple avec la bilame 44.In the event of a magnetic trip following a short circuit, the striker 34 of the electromagnetic trip device acts on the lower arm of the trip lever 42 to ensure the locking of the hook 50 for hooking by escaping the retaining notch 54. The trigger lever 42 is thus moved to the triggered position in the trigometric direction, without any braking reaction from the thermal trigger drawer 60 which remains inactive thanks to the presence of the flexible connection with the bimetallic strip 44.

Selon l'invention, le levier support 36 du bras de contact 14 comporte une butée 70 de limitation de la course de la manette 24 en cas de soudage des contacts 16, 18, ladite butée 70 étant conformée en bras transversal situé dans l'intervalle délimité par la genouillère 30 et le déclencheur électromagnétique. La butée 70 est susceptible de coopérer avec un nez de blocage 72 faisant saillie de l'embase 27 à l'opposé de la manette 24 par rapport à l'axe de pivotement 26. Un voyant 74 de signalisation apparente de l'ouverture du disjoncteur est agencé sur l'embase 27 au voisinage de l'articulation 32 de la genouillère 30, de manière à être visible de l'extérieur du boîtier 12 par l'orifice 20 lorsque la manette 24 arrive dans la position d'ouverture O, représentée à la figure 2. La butée 70 et le nez de blocage 72 viennent directement de moulage respectivement avec le levier support 36 isolant et l'embase 27 isolante de la manette 24.According to the invention, the support lever 36 of the contact arm 14 comprises a stop 70 for limiting the stroke of the lever 24 in the event of welding of the contacts 16, 18, said stop 70 being shaped as a transverse arm situated in the interval delimited by the toggle switch 30 and the electromagnetic trigger. The abutment 70 is capable of cooperating with a blocking nose 72 projecting from the base 27 opposite the lever 24 relative to the pivot axis 26. An indicator light 74 for visible indication of the opening of the circuit breaker is arranged on the base 27 in the vicinity of the articulation 32 of the toggle joint 30, so as to be visible from the outside of the housing 12 through the orifice 20 when the lever 24 arrives in the open position O, shown at FIG. 2. The stop 70 and the locking nose 72 come directly from molding respectively with the insulating support lever 36 and the insulating base 27 of the lever 24.

Le fonctionnement du mécanisme 10 de commande du disjoncteur selon les figures 1 à 3 est le suivant:The operation of the circuit breaker control mechanism 10 according to FIGS. 1 to 3 is as follows:

Dans la position F de fermeture des contacts 14, 16 (figure 1) la manette 24 se trouve à droite, et le nez de blocage 72 est écarté de la butée 70 par un intervalle prédéterminé. Le positionnement du voyant 74 en position effacée, à l'intérieur du boîtier 12, ne le rend pas visible de l'extérieur. L'articulation 32 de la genouillère 30 est située en dessous du point mort de la genouillère 30 formée par l'alignement de l'axe de pivotement de la manette 24 avec les axes d'articulation 32, 56 de la biellette 28 de transmission, respectivement sur l'embase 27 et le crochet d'accrochage 50. Dans cette première position stable de la genouillère 30, le ressort de rappel de la manette 24 est inactif, et la manette 24 est maintenue de manière stable dans ma position F de fermeture par la platine 40 et la biellette 28.In the closed position F of the contacts 14, 16 (FIG. 1) the lever 24 is on the right, and the locking nose 72 is moved away from the stop 70 by a predetermined interval. The positioning of the indicator 74 in the erased position, inside the housing 12, does not make it visible from the outside. The articulation 32 of the toggle joint 30 is located below the dead center of the toggle joint 30 formed by the alignment of the pivot axis of the lever 24 with the articulation axes 32, 56 of the transmission link 28, respectively on the base 27 and the hook 50. In this first stable position of the toggle joint 30, the return spring of the handle 24 is inactive, and the handle 24 is held stably in my closed position F by the plate 40 and the link 28.

Lors d'une ouverture manuelle par la manette 24 ou automatique par le levier de déclenchement 42, entraînant un fonctionnement normal de séparation des contacts 16, 18 (voir figure 2), la butée 70 suit le mouvement de pivotement du bras de contact 14 dans le sens inverse des aiguilles d'une montre de manière à s'effacer devant le bec de blocage 72 de l'embase 27. La libération de l'embase 27 autorise la course totale de pivotement de la manette 24 vers la gauche jusqu'à la position O stable d'ouverture (voir figure 2), avec signalisation apparente de l'ouverture par le voyant 74 visible à travers l'orifice 20. La genouillère 30 se trouve alors dans une deuxième position stable avec l'articulation 32 située au-dessus du point mort.During a manual opening by the lever 24 or automatic opening by the trigger lever 42, causing a normal operation of separation of the contacts 16, 18 (see FIG. 2), the stop 70 follows the pivoting movement of the contact arm 14 in anti-clockwise so as to disappear in front of the locking spout 72 of the base 27. The release of the base 27 authorizes the total pivoting stroke of the lever 24 to the left until position O stable opening (see Figure 2), with visible signaling of the opening by the sight glass 74 visible through the orifice 20. The toggle joint 30 is then in a second stable position with the articulation 32 located above the neutral.

En cas de soudure des contacts 16, 18, un actionnement de la manette 24 à partir de la position de fermeture F vers la position d'ouverture O (indiquée par la flèche sur la figure 3) est stoppé dans une position intermédiaire S située entre les deux positions extrêmes F et O. Dans l'état fermé-soudé des contacts 16, 18, la butée 70 reste immobile dans une position fixe identique à celle de la figure 1, de manière à interférer avec la trajectoire de pivotement de l'embase 27. Il en résulte la venue en engagement du bec de blocage 72 contre la butée 70 fixe lorsque la manette 24 arrive dans la position intermédiaire S. En cas de relâchement de la manette 24, cette dernière reste positionnée dans la position intermédiaire S grâce à l'action du ressort de rappel de la manette 24 intervenant après le dépassement du point mort de la genouillère 30. On voit clairement sur la figure 3 que l'articulation 32 de la genouillère 30 se trouve légèrement au-dessus de la ligne d'action passant par l'axe 26 de pivotement de la manette 24 et l'axe d'articulation 56 de la biellette 28. La présence de la manette 24 dans la position intermédiaire S stable, et l'absence d'apparition du voyant 74 dans l'orifice 20, indiquent sans ambiguité l'état soudé des contacts 16, 18. Etant donné que le bras de contact 14 est assujetti directement au levier support 36, on remarque que la butée 70 constitue dans la position intermédiaire S un blocage positif de la manette 24 représentant avec précision la position du contact mobile 16 dans l'état fermé-soudé. La rigidité mécanique de la butée 70 empêche la déformation élastique du levier support 36 pour empêcher une éventuelle tentative d'actionnement forcée de la manette 24 au-delà de la position intermédiaire S vers la position O. La présence de la butée 70 directe de limitation de la course de la manette 24 évite tout cadenassage de la manette 24 dans la position d'ouverture O, lorsque les contacts 16, 18 se trouvent dans l'état fermé-soudé.In the event of soldering of the contacts 16, 18, an actuation of the lever 24 from the closed position F to the open position O (indicated by the arrow in FIG. 3) is stopped in an intermediate position S located between the two extreme positions F and O. In the closed-welded state of the contacts 16, 18, the stop 70 remains stationary in a fixed position identical to that of FIG. 1, so as to interfere with the pivoting path of the base 27. This results in the engagement of the locking spout 72 against the fixed stop 70 when the lever 24 arrives in the intermediate position S. In the event of the lever 24 being released, the latter remains positioned in the intermediate position S thanks to to the action of the return spring of the lever 24 intervening after passing the neutral point of the toggle joint 30. It is clearly seen in FIG. 3 that the articulation 32 of the toggle joint 30 is located slightly above the line of action passing through the pivot axis 26 of the lever 24 and the articulation axis 56 of the link 28. The presence of the lever 24 in the stable intermediate position S, and the absence of appearance of the indicator light 74 in the orifice 20, unambiguously indicate the welded state of the contacts 16, 18. Since the contact arm 14 is fixed directly to the support lever 36, it is noted that the stop 70 constitutes in the intermediate position S a positive locking of the handle 24 accurately representing the position of the movable contact 16 in the closed-welded state. The mechanical rigidity of the stop 70 prevents the elastic deformation of the support lever 36 to prevent a possible attempt at forced actuation of the lever 24 beyond the intermediate position S towards the position O. The presence of the direct stop 70 limiting of the stroke of the lever 24 avoids any padlocking of the lever 24 in the open position O, when the contacts 16, 18 are are in the closed-welded state.

Selon le mécanisme 100 de commande illustré à la figure 4, les mêmes numéros de repères seront utilisés pour désigner des pièces identiques ou analogues à celles du mécanisme 10 des figures 1-3. La butée 70 de limitation de la course de la manette 24 en cas de soudure des contacts 16, 18 est agencée dans cette variante sur un levier auxiliaire 102 monté à pivotement sur le pivot 38 de la platine 40 (non représentée), et du levier support 36 du bras de contac 14. Un ressort de compression 104 est intercalé entre des bossages respectifs des leviers 102, 36, de manière à solliciter le levier auxiliaire 102 dans le sens trigonométrique en appui sur un ergot 105 solidaire du levier support 36. Dans l'état fermé-soudé des contacts 16, 18 (illustré à la figure 4), le levier auxiliaire 102 se trouve en engagement contre l'ergot 105, et la butée 70 coopère avec le bec de blocage 72 de l'embase 27 pour bloquer la manette 24 dans la position intermédiaire S après dépassement du point mort de la genouillère 30. L'ensemble levier auxiliaire 102 et ressort 104 constitue un cliquet de verrouillage permettant d'éviter les butées parasites, et étant conformé en levier amplificateur pour le blocage de la manette 24.According to the control mechanism 100 illustrated in FIG. 4, the same reference numbers will be used to designate parts identical or analogous to those of the mechanism 10 in FIGS. 1-3. The stop 70 for limiting the stroke of the lever 24 in the event of soldering of the contacts 16, 18 is arranged in this variant on an auxiliary lever 102 pivotally mounted on the pivot 38 of the plate 40 (not shown), and of the lever support 36 of the contact arm 14. A compression spring 104 is interposed between respective bosses of the levers 102, 36, so as to urge the auxiliary lever 102 in the counterclockwise direction by pressing on a lug 105 integral with the support lever 36. In the closed-welded state of the contacts 16, 18 (illustrated in FIG. 4), the auxiliary lever 102 is in engagement against the lug 105, and the stop 70 cooperates with the locking spout 72 of the base 27 for block the lever 24 in the intermediate position S after passing the neutral position of the toggle joint 30. The auxiliary lever 102 and spring 104 assembly constitutes a locking pawl making it possible to avoid parasitic stops, and being shaped as a lever amplifier for locking the joystick 24.

Claims (5)

  1. An operating mechanism of a miniature electrical circuit breaker with an insulating case (12) housing a pair of stationary (18) and movable (16) contacts, said movable contact (16) being supported by a pivoting contact arm (14) actuated by the mechanism (10, 100) between the closed and open positions of the contacts, said mechanism comprising :
    - a transmission rod (28) arranged between a breakable mechanical link (48) and a handle (24), which is equipped with a base (27) coupled to the transmission rod (28) to form a toggle (30) whose articulation spindle (32) is eccentric with respect to the pivoting spindle (26) of the handle (24), the latter being movable between two extreme positions F and O corresponding respectively to closing and opening of the contacts (16, 18),
    - a trip lever (42) operated in case of a fault by the trip device to a tripped position, resulting in breaking of the mechanical link (48) and automatic tripping of the mechanism (10, 100), independently from the handle (24),
    - a return spring urging the handle (24) to the open position O,
    - the contact arm (14) being connected to a stop (70) arranged, in case of welding of the contacts (16, 18), to stop the handle (24) in a predetermined intermediate position S situated between the closed position F and open position O, the handle (24) being held in said intermediate position after the dead point of the toggle (30) has been passed,
    characterized in that the stop (70) limiting the travel of the handle (24) is fixed directly onto a support lever (36) made of insulating material secured to the contact arm (14), that the support lever (36) is articulated on a pivot (38) of a rotating plate (40), and that the stop (70) cooperates in the intermediate position with a blocking nose (72) protruding out from the base (27) of the handle (24).
  2. The operating mechanism according to claim 1, characterized in that the handle (24) is provided with an indicator flag (74) enabling positive indication of opening of the circuit breaker when the handle (24) reaches the open position O after the stop (70) has retracted.
  3. The operating mechanism according to claim 2, characterized in that the indicator flag (74) is arranged on the circumference of the base (27) between the blocking nose (72) and the handle (24) so as to be visible from outside in said open position O via an orifice (20) through which the handle (24) passes, arranged in the front panel of the insulating case (12), said indicator flag (74) moreover being invisible when the handle (24) is in the stable intermediate position S after welding of the contacts (16, 18).
  4. The operating mechanism according to one of the claims 1, 2 or 3, characterized in that the stop (70) of the mechanism (100) is located on an auxiliary lever (102) arranged as a ratchet pivotally mounted on the pivot (38) of the plate (40) and of the support lever (36) of the contact arm (14).
  5. The operating mechanism according to claim 4, characterized in that a spring (104) urges pivoting of the auxiliary lever (102) towards a stud (105) of the support lever (36) to make the stop (70) cooperate with the blocking nose (72) when the handle (24) reaches the intermediate position S.
EP19890420159 1988-05-13 1989-04-28 Operating mechanism for a miniature circuit breaker having a contact-welding indicator Expired - Lifetime EP0342133B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8806562A FR2631485B1 (en) 1988-05-13 1988-05-13 MINIATURE CIRCUIT BREAKER CONTROL MECHANISM WITH CONTACT WELDING INDICATOR
FR8806562 1988-05-13

Publications (2)

Publication Number Publication Date
EP0342133A1 EP0342133A1 (en) 1989-11-15
EP0342133B1 true EP0342133B1 (en) 1993-08-11

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EP19890420159 Expired - Lifetime EP0342133B1 (en) 1988-05-13 1989-04-28 Operating mechanism for a miniature circuit breaker having a contact-welding indicator

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EP (1) EP0342133B1 (en)
DE (1) DE68908263T2 (en)
ES (1) ES2044192T3 (en)
FR (1) FR2631485B1 (en)

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Also Published As

Publication number Publication date
DE68908263D1 (en) 1993-09-16
FR2631485B1 (en) 1995-06-02
DE68908263T2 (en) 1994-03-10
EP0342133A1 (en) 1989-11-15
ES2044192T3 (en) 1994-01-01
FR2631485A1 (en) 1989-11-17

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