EP0538155A1 - Manufacturing process for an electromagnetic trip device with molded-in striker and trip device so obtained - Google Patents

Manufacturing process for an electromagnetic trip device with molded-in striker and trip device so obtained Download PDF

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Publication number
EP0538155A1
EP0538155A1 EP92420357A EP92420357A EP0538155A1 EP 0538155 A1 EP0538155 A1 EP 0538155A1 EP 92420357 A EP92420357 A EP 92420357A EP 92420357 A EP92420357 A EP 92420357A EP 0538155 A1 EP0538155 A1 EP 0538155A1
Authority
EP
European Patent Office
Prior art keywords
fixed core
core
trigger rod
fixed
trip device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92420357A
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German (de)
French (fr)
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EP0538155B1 (en
Inventor
Gérard Mazuit
Jean-Marc Finet
François Reynaud
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.)
Schneider Electric SE
Original Assignee
Merlin Gerin SA
Schneider Electric SE
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Publication date
Application filed by Merlin Gerin SA, Schneider Electric SE filed Critical Merlin Gerin SA
Publication of EP0538155A1 publication Critical patent/EP0538155A1/en
Application granted granted Critical
Publication of EP0538155B1 publication Critical patent/EP0538155B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H69/00—Apparatus or processes for the manufacture of emergency protective devices

Definitions

  • the present invention relates generally to a method of manufacturing an electromagnetic trip device for a circuit breaker.
  • the invention also relates to such an electromagnetic trip device for circuit breaker.
  • Circuit breakers are generally constituted by a switch comprising a movable contact and a fixed contact and by a trigger which actuates the switch to open it when the intensity of electric current flowing through the circuit breaker exceeds a predetermined threshold.
  • the circuit breaker generally includes a thermal trip device and an electromagnetic trip device.
  • Such an electromagnetic trip device constitutes a relatively bulky, expensive and delicate part, in particular when it is used in a miniature circuit breaker intended to be produced in very large series at low costs.
  • the electromagnetic trip device is difficult to make because it has moving mechanical parts which can cause reliability problems, wear, adjustment drift, etc.
  • a widely used electromagnetic trip device comprises a cylinder head on which a fixed core is mounted.
  • a sheath is mounted around the fixed core which is generally of cylindrical shape and this sheath forms in the extension of the fixed core a cylindrical cavity in which is housed so as to be able to slide axially a movable core.
  • a coil surrounds the sheath, and the electric current flowing through the circuit breaker passes through this coil.
  • the movable core is permanently pushed by a spring in the direction of separation from the fixed core so that an air gap is created between a perpendicular flat face of the mobile core and a perpendicular flat face opposite the fixed core, this air gap being located substantially in the central central part of the sheath.
  • a trigger rod is fixed by one of its ends to the movable core and passes right through the fixed core through a bore formed axially in the fixed core, so that its other end projects to the outside the electromagnetic release.
  • An object of the present invention is to provide a method for manufacturing an electromagnetic trip device, this process being particularly simple to implement, so that the electromagnetic trip device is particularly inexpensive while remaining very reliable.
  • Another object of the present invention is to provide such an electromagnetic trip device whose original design makes it very inexpensive and very reliable.
  • the invention therefore relates to a method of manufacturing an electromagnetic trip device, this trip device comprising a fixed core adapted to be mounted on a cylinder head, a movable core which can move between a position remote from the fixed core and a position close to the fixed core, and a trigger rod connected to the movable core and extending through a through hole of the fixed core.
  • this method comprises the following stages: production of a mold comprising an imprint of an assembly formed by the fixed core, the movable core and the trigger rod, the relative positions of these three parts being substantially those they occupy when the three parts are mounted in the trigger and the movable core is distant from the fixed core; placing the fixed core and the movable core in the mold and injecting a molding material to produce the trigger rod by overmolding on the fixed and movable cores, then demolding of the assembly thus formed; and takeoff between the fixed core and the trigger rod which is overmolded on the fixed core.
  • said take-off operation consists of the application of a force causing a longitudinal relative displacement between the fixed core and the trigger rod.
  • the method further comprises a step of mounting the fixed core against the cylinder head, this step being obtained by gripping the assembly formed by the fixed core, the movable core and the trigger rod overmolded, this entry being made at the level of the movable core or of the trigger rod, then by bringing this together against the cylinder head so as to cause a shock meeting between the fixed core and the cylinder head, this shock causing both the mounting of the fixed core on the cylinder head and the takeoff between the fixed core and the trigger rod.
  • the invention also relates to an electromagnetic trip device comprising: a fixed core adapted to be mounted on a cylinder head, a movable core which can move between a position remote from the fixed core and a position close to the fixed core, and a trigger rod connected to the core mobile and passing through the fixed core.
  • the trigger rod is made of plastic, extends both through a bore of the fixed core and through a through hole of the movable core and is overmolded to the inside the fixed and mobile cores; where it follows that a force causing a relative longitudinal displacement between the fixed core and the trigger rod makes it possible to cause a takeoff between the fixed core and the trigger rod.
  • FIG. 1 shows an electromagnetic trip device of the prior art.
  • This trigger is shown schematically and simplified because such a device is well known and because it is therefore not necessary to describe it in its smallest construction details.
  • a known electromagnetic trip device comprises a sheath 1 which has the general shape of a cylindrical tube, a fixed core 2 which is fitted into the bore of the sheath 1 at one of its ends and a movable core 3 which is threaded in the same bore of the sleeve 1 and which is axially movable inside this bore.
  • the trip device further comprises a winding 4 arranged around the sheath 1 and through which an electric current flows which must actuate the trip device when its intensity exceeds a predetermined threshold.
  • the trigger further comprises a fixed cylinder head 5 on which the fixed core 2 is fixed.
  • the fixed core 2 has a generally cylindrical shape and has an axial bore 6 which passes right through it.
  • the movable core 3 has a generally cylindrical shape and comprises at its end directed towards the fixed core 2 a fixing element 7 on which is fixedly mounted a trigger rod 8 which passes through the bore 6 of the fixed core 2 for stand out on the outside at its end 9 furthest from the movable core 3. It follows from this that the assembly formed by the movable core 3, the fixing element 7 and the trigger rod 8 forms a single movable part which can move axially between two extreme positions.
  • the fixed core 2 and the movable core 3 respectively have perpendicular plane faces 10, 11 facing each other.
  • the movable core 3 further comprises a mooring element 12 on which is mounted a spring 13 which permanently exerts a thrust on the movable core 3 in the direction of its separation from the fixed core 2.
  • a predetermined threshold When an electric current flowing in the winding 4 is less than a predetermined threshold, the movable core 3 remains separated from the fixed core 2, due to the action of the spring 13, and the space separating the faces 10 and 11 forms an air gap.
  • the movable core 3 abruptly approaches the fixed core 2 until it comes into contact with it, which causes the displacement of the rod 8 whose end 9 comes out more of the trip device to come trigger the opening of an electrical contact of the circuit breaker (not shown).
  • the end 9 of the trigger rod 8 has a diameter greater than the diameter of the bore 6 in order to limit the spacing of the movable core 3 relative to the fixed core 2. Consequently, it is necessary in this case to start by threading the trigger rod 8 through the bore 6 of the fixed core 2 before proceeding to rigidly fix this trigger rod 8 with the movable core 3.
  • This mounting operation has proved to be delicate and expensive .
  • such an electromagnetic trip device undergoes sudden forces or shocks at its movable elements constituted by the movable core 3, the fixing element 7 and the trigger rod 8, and these mechanical shocks can rapidly deteriorate the mechanical connection between the trigger rod 8 and the movable core 3.
  • FIG. 2 represents an electromagnetic trip device of a general design similar to that illustrated by FIG. 1 but in which the movable core, the fixed core and the trigger rod have differences in their design and in their manufacturing process which constitute the originality of the present invention.
  • a sheath 1 can be distinguished around which is wound a winding 4 and a cylinder head 5, all these parts possibly being identical to those described in relation to the electromagnetic trip device of the prior art represented in FIG. 1.
  • this trigger according to the invention comprises a fixed core 20 which has a bore 21 which passes right through it, a trigger rod 22 which passes through the bore 21 and which passes through a through hole 23 of a movable core 24 and which emerges from the other side of the movable core 24 so that its free end 25 constitutes a securing element of a spring 13
  • the rod 22 forms a single piece, preferably made of plastic, from its end 25 which serves as mooring for the spring 13 to its other opposite end 26 which makes it possible to trigger an electrical contact of a circuit breaker (not shown ).
  • the assembly of the trigger rod that is to say the trigger rod itself 22, and its two opposite ends 25 and 26, constitutes a single piece of plastic.
  • This part is in fact molded inside the passage hole 23 which passes right through the movable core 24.
  • the fact of overmolding the trigger rod 22 in the passage hole 23 of the movable core 24 ensures a definitive rigid connection the trigger rod 22 and the movable core 24.
  • This connection has excellent mechanical characteristics.
  • the bore 21 of the fixed core 20 has a diameter slightly larger than that of the trigger rod 22 at the same level, in order to allow the sliding of these two parts one over the other.
  • the hole 23 which passes through the movable core 24 may have a flared part at the two opposite ends of the hole, so that the trigger rod 22 which follows the shape of the hole 23 remains integral with the movable core 24 even if it doesn’t there is no real adhesion between the material of the rod 22 and that of the movable core 24.
  • the rod 22 has a diameter which varies without discontinuity all along the rod, which makes it possible to increase the resistance to fatigue of this rod 22 and to reduce its fragility. This is all the more important since the trigger rod 22 is preferably made of plastic material.
  • the presence of this plastic rod 22 passing right through both the fixed core 20 and the movable core 24 limits the mass of these two cores which are metallic, which reduces the mass of the together and this significantly improves the tripping speed of the circuit breaker.
  • FIG. 3 illustrates a first step in the method of producing such an assembly.
  • This first step consists in producing a particular mold (not shown) which includes an imprint of the assembly formed by the fixed core 20, the movable core 24 and the trigger rod 22.
  • the relative positions of these three parts are those they occupy when the three parts 20, 23, 22 are mounted in the trigger while the movable core 24 is distant from the fixed core 20 (positions as shown in Figure 3).
  • the fixed core 20 and the movable core 24 are placed in such a mold, then a plastic molding material is injected which occupies the rest of the mold footprint by being overmolded against the fixed and mobile cores 20, 24, this overmolding taking place simultaneously at the bore 21 of the fixed core 20 and at the passage hole 23 of the mobile core 24.
  • the plastic material thus injected into the mold constitutes the rod trigger 22 of the electromagnetic trigger. It follows from this that the trigger rod 22 adheres both to the fixed core 20 and to the movable core 24, after demolding of the assembly.
  • the adhesion of the trigger rod 22 with the movable core 24 is useful because it contributes to ensuring the final rigid connection of these two parts.
  • a mold is produced, for example a mold in two parts having a joint plane passing through the longitudinal axis of the trigger rod 22, this mold matching the external shapes of all the parts such as shown in Figure 3.
  • the cores are made of metal, in order to fulfill their magnetic function, it is easy to mold the trigger rod 22, for example using a plastic material, by choosing a melting temperature of this plastic material which does not alter the movable core 24 and the fixed core 20.
  • FIG. 4 A next step in the manufacturing process is illustrated in FIG. 4. During this next step, takeoff is carried out between the fixed core 20 and the trigger rod 22. To take off, it suffices to exert an axial thrust on the fixed core 20 in the direction of the movable core 24 (arrow F).
  • the bore 21 of the fixed core 20 may be cylindrical, but, in certain cases, it is preferable that this bore 21 (as shown in FIG. 4) is slightly conical so that its diameter is larger in its part the most distant from the movable core 24. Under these conditions, the fact of moving the fixed core 20 in the direction of the movable core 24 causes the detachment of the fixed core 20 relative to the trigger rod 22, and reveals a slight play J between the movable core 20 and the trigger rod 22.
  • the taper of the bore 21 is relatively small so that the clearance J remains weak.
  • This operation mounting can be performed in particular automatically by bringing the assembly formed by the trigger rod 22, the fixed core 20 and the movable core 24 opposite the cylinder head 5, then by moving axially This assembly in the direction of the cylinder head 5 (along arrow H) by exerting a push on the trigger rod 22, until the bearing face 30 of the fixed core 20 abuts against the cylinder head 5.
  • the reaction force of the cylinder head 5 against the face 30 of the fixed core 20 makes it possible to detach the fixed core 20 relative to the trigger rod 22.
  • this reaction force is used in a manner similar to the force which is illustrated by the arrows F in FIG. 4 in order to cause the separation of the fixed core with respect to the trigger rod during the assembly operation.
  • Such a manufacturing method according to the invention makes it possible to obtain a reinforcement of the mechanical strength of the striker and of the movable core. This process also makes it possible to obtain a lightening of the mobile core and consequently an increase in the percussion speed.
  • a plastic material as a molding material
  • a non-magnetic metallic molding material in particular based on zinc, for example the product known commercially under the name ZAMAK.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electromagnets (AREA)
  • Breakers (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

The trip device comprises a fixed core (20) adapted for mounting on a yoke (5), a moving core (24) capable of travelling between a position removed from the fixed core and a position brought close to the fixed core, and a trip rod (22) linked to the moving core and extending through a bore (21) in the fixed core. Its method of manufacture consists in producing the trip rod (22) by simultaneous moulding-in inside the fixed core (20) and inside the moving core (24) and in carrying out a debonding operation between the fixed core and the trip rod so as finally to detach the fixed core. <IMAGE>

Description

La présente invention concerne de façon générale un procédé de fabrication d'un déclencheur électromagnétique pour disjoncteur. L'invention concerne aussi un tel déclencheur électromagnétique pour disjoncteur.The present invention relates generally to a method of manufacturing an electromagnetic trip device for a circuit breaker. The invention also relates to such an electromagnetic trip device for circuit breaker.

Les disjoncteurs sont généralement constitués par un interrupteur comprenant un contact mobile et un contact fixe et par un déclencheur qui vient actionner l'interrupteur pour l'ouvrir lorsque l'intensité de courant électrique qui traverse le disjoncteur dépasse un seuil prédéterminé. Le disjoncteur comporte généralement un déclencheur thermique et un déclencheur électromagnétique. Un tel déclencheur électromagnétique constitue une pièce relativement encombrante, chère et délicate, en particulier lorsqu'il est utilisé dans un disjoncteur miniaturisé destiné à être fabriqué en très grande série à faibles coûts.Circuit breakers are generally constituted by a switch comprising a movable contact and a fixed contact and by a trigger which actuates the switch to open it when the intensity of electric current flowing through the circuit breaker exceeds a predetermined threshold. The circuit breaker generally includes a thermal trip device and an electromagnetic trip device. Such an electromagnetic trip device constitutes a relatively bulky, expensive and delicate part, in particular when it is used in a miniature circuit breaker intended to be produced in very large series at low costs.

Le déclencheur électromagnétique est difficile à réaliser parce qu'il comporte des pièces mécaniques mobiles qui peuvent être à l'origine de problèmes de fiabilité, d'usure, de dérive du réglage, etc.The electromagnetic trip device is difficult to make because it has moving mechanical parts which can cause reliability problems, wear, adjustment drift, etc.

Un déclencheur électromagnétique très répandu comprend une culasse sur laquelle est monté un noyau fixe. Un fourreau est monté autour du noyau fixe qui est généralement de forme cylindrique et ce fourreau forme dans le prolongement du noyau fixe une cavité cylindrique dans laquelle vient se loger de façon à pouvoir coulisser axialement un noyau mobile. Une bobine entoure le fourreau, et le courant électrique traversant le disjoncteur traverse cette bobine. Le noyau mobile est poussé en permanence par un ressort dans le sens d'éloignement par rapport au noyau fixe de telle sorte qu'un entrefer est créé entre une face plane perpendiculaire du noyau mobile et une face plane perpendiculaire en regard du noyau fixe, cet entrefer étant situé sensiblement dans la partie centrale médiane du fourreau. Une tige de déclenchement est fixée par l'une de ses extrémités au noyau mobile et traverse de part en part le noyau fixe au travers d'un alésage ménagé axialement dans le noyau fixe, de façon à ce que son autre extrémité se projette à l'extérieur du déclencheur électromagnétique. Lorsqu'un courant électrique intense traverse la bobine, la force d'attraction du noyau mobile vers le noyau fixe dépasse la force de rappel du ressort et le noyau mobile se déplace brusquement vers le noyau fixe et entraîne dans son déplacement la tige de déclenchement qui sort davantage du déclencheur en venant actionner l'interrupteur du disjoncteur afin d'ouvrir brusquement le circuit, c'est à dire d'écarter le contact mobile du contact fixe de l'interrrupteur.A widely used electromagnetic trip device comprises a cylinder head on which a fixed core is mounted. A sheath is mounted around the fixed core which is generally of cylindrical shape and this sheath forms in the extension of the fixed core a cylindrical cavity in which is housed so as to be able to slide axially a movable core. A coil surrounds the sheath, and the electric current flowing through the circuit breaker passes through this coil. The movable core is permanently pushed by a spring in the direction of separation from the fixed core so that an air gap is created between a perpendicular flat face of the mobile core and a perpendicular flat face opposite the fixed core, this air gap being located substantially in the central central part of the sheath. A trigger rod is fixed by one of its ends to the movable core and passes right through the fixed core through a bore formed axially in the fixed core, so that its other end projects to the outside the electromagnetic release. When an intense electric current crosses the coil, the force of attraction of the mobile core towards the fixed core exceeds the restoring force of the spring and the mobile core suddenly moves towards the fixed core and drives in its displacement the trigger rod which comes out more from the trip unit by actuating the circuit breaker switch in order to suddenly open the circuit, that is to say to move the movable contact away from the fixed contact of the switch.

Pour des disjoncteurs fabriqués à moindre coût en très grande série, il est essentiel que le déclencheur électromagnétique soit particulièrement bon marché tout en restant cependant très fiable.For circuit breakers produced at low cost in very large series, it is essential that the electromagnetic trip unit is particularly inexpensive while remaining very reliable.

Un objet de la présente invention consiste à fournir un procédé de fabrication d'un déclencheur électromagnétique, ce procédé étant particulièrement simple à mettre en oeuvre, de telle sorte que le déclencheur électromagnétique soit particulièrement bon marché tout en restant très fiable.An object of the present invention is to provide a method for manufacturing an electromagnetic trip device, this process being particularly simple to implement, so that the electromagnetic trip device is particularly inexpensive while remaining very reliable.

Un autre objet de la présente invention consiste à fournir un tel déclencheur électromagnétique dont la conception originale le rend très bon marché et très fiable.Another object of the present invention is to provide such an electromagnetic trip device whose original design makes it very inexpensive and very reliable.

L'invention concerne donc un procédé de fabrication d'un déclencheur électromagnétique, ce déclencheur comprenant un noyau fixe adapté pour être monté sur une culasse, un noyau mobile pouvant se déplacer entre une position éloignée du noyau fixe et une position rapprochée du noyau fixe, et une tige de déclenchement reliée au noyau mobile et s'étendant au travers d'un trou de passage du noyau fixe.The invention therefore relates to a method of manufacturing an electromagnetic trip device, this trip device comprising a fixed core adapted to be mounted on a cylinder head, a movable core which can move between a position remote from the fixed core and a position close to the fixed core, and a trigger rod connected to the movable core and extending through a through hole of the fixed core.

Selon une caractéristique de l'invention, ce procédé comprend les étapes suivantes : réalisation d'un moule comprenant une empreinte d'un ensemble formé par le noyau fixe, le noyau mobile et la tige de déclenchement, les positions relatives de ces trois pièces étant sensiblement celles qu'elles occupent lorsque les trois pièces sont montées dans le déclencheur et que le noyau mobile est éloigné du noyau fixe ; mise en place dans le moule du noyau fixe et du noyau mobile et injection d'une matière de moulage pour réaliser la tige de déclenchement par surmoulage sur les noyaux fixe et mobile, puis démoulage de l'ensemble ainsi constitué ; et décollage entre le noyau fixe et la tige de déclenchement qui est surmoulée sur le noyau fixe.According to a characteristic of the invention, this method comprises the following stages: production of a mold comprising an imprint of an assembly formed by the fixed core, the movable core and the trigger rod, the relative positions of these three parts being substantially those they occupy when the three parts are mounted in the trigger and the movable core is distant from the fixed core; placing the fixed core and the movable core in the mold and injecting a molding material to produce the trigger rod by overmolding on the fixed and movable cores, then demolding of the assembly thus formed; and takeoff between the fixed core and the trigger rod which is overmolded on the fixed core.

Selon une autre caractéristique de l'invention, ladite opération de décollage consiste en l'application d'une force provoquant un déplacement relatif longitudinal entre le noyau fixe et la tige de déclenchement.According to another characteristic of the invention, said take-off operation consists of the application of a force causing a longitudinal relative displacement between the fixed core and the trigger rod.

Selon une autre caractéristique de l'invention, le procédé comprend en outre une étape de montage du noyau fixe contre la culasse, cette étape étant obtenue par une saisie de l'ensemble formé par le noyau fixe, le noyau mobile et la tige de déclenchement surmoulée, cette saisie s'effectuant au niveau du noyau mobile ou de la tige de déclenchement, puis en amenant cet ensemble contre la culasse de façon à provoquer une rencontre avec choc entre le noyau fixe et la culasse, ce choc provoquant à la fois le montage du noyau fixe sur la culasse et le décollage entre le noyau fixe et la tige de déclenchement.According to another characteristic of the invention, the method further comprises a step of mounting the fixed core against the cylinder head, this step being obtained by gripping the assembly formed by the fixed core, the movable core and the trigger rod overmolded, this entry being made at the level of the movable core or of the trigger rod, then by bringing this together against the cylinder head so as to cause a shock meeting between the fixed core and the cylinder head, this shock causing both the mounting of the fixed core on the cylinder head and the takeoff between the fixed core and the trigger rod.

L'invention concerne également un déclencheur électromagnétique comprenant : un noyau fixe adapté pour être monté sur une culasse, un noyau mobile pouvant se déplacer entre une position éloignée du noyau fixe et une position rapprochée du noyau fixe, et une tige de déclenchement reliée au noyau mobile et passant au travers du noyau fixe.The invention also relates to an electromagnetic trip device comprising: a fixed core adapted to be mounted on a cylinder head, a movable core which can move between a position remote from the fixed core and a position close to the fixed core, and a trigger rod connected to the core mobile and passing through the fixed core.

Selon une caractéristique de l'invention, la tige de déclenchement est réalisée en matière plastique, s'étend à la fois au travers d'un alésage du noyau fixe et au travers d'un trou de passage du noyau mobile et est surmoulée à l'intérieur des noyaux fixe et mobile ; d'où il résulte qu'une force provoquant un déplacement relatif longitudinal entre le noyau fixe et la tige de déclenchement permet de provoquer un décollage entre le noyau fixe et la tige de déclenchement.According to a characteristic of the invention, the trigger rod is made of plastic, extends both through a bore of the fixed core and through a through hole of the movable core and is overmolded to the inside the fixed and mobile cores; where it follows that a force causing a relative longitudinal displacement between the fixed core and the trigger rod makes it possible to cause a takeoff between the fixed core and the trigger rod.

Ces objets, caractéristiques et avantages, ainsi que d'autres de la présente invention seront mieux exposés dans la description détaillée d'un exemple de réalisation qui va suivre, illustrée par les dessins annexés parmi lesquels :

  • la figure 1 est une vue schématique en coupe longitudinale d'un déclencheur électromagnétique de l'art antérieur ;
  • la figure 2 est une vue schématique en coupe longitudinale d'un déclencheur électromagnétique selon la présente invention ;
  • la figure 3 représente en coupe longitudinale une partie d'un déclencheur électromagnétique selon l'invention, afin d'illustrer une première étape d'un procédé de fabrication selon l'invention ;
  • la figure 4 est une vue semblable à celle de la figure 3 illustrant une seconde étape du même procédé de fabrication selon l'invention ; et
  • la figure 5 est une vue en coupe longitudinale d'un mode de réalisation particulier d'un déclencheur électromagnétique selon l'invention, ce mode de réalisation correspondant à celui représenté sur les figures 3 et 4.
These objects, characteristics and advantages, as well as others of the present invention will be better explained in the detailed description of an example of embodiment which follows, illustrated by the appended drawings among which:
  • Figure 1 is a schematic view in longitudinal section of an electromagnetic trip device of the prior art;
  • Figure 2 is a schematic view in longitudinal section of an electromagnetic trip device according to the present invention;
  • FIG. 3 represents in longitudinal section part of an electromagnetic trip device according to the invention, in order to illustrate a first step of a manufacturing method according to the invention;
  • Figure 4 is a view similar to that of Figure 3 illustrating a second step of the same manufacturing process according to the invention; and
  • FIG. 5 is a view in longitudinal section of a particular embodiment of an electromagnetic trip device according to the invention, this embodiment corresponding to that shown in FIGS. 3 and 4.

La figure 1 représente un déclencheur électromagnétique de l'art antérieur. Ce déclencheur est représenté de manière schématique et simplifiée parce qu'un tel dispositif est bien connu et parce qu'il n'est donc pas nécessaire de le décrire dans ses moindres détails de construction. De façon générale, un tel déclencheur électromagnétique connu comporte un fourreau 1 qui présente la forme générale d'un tube cylindrique, un noyau fixe 2 qui est emmanché dans l'alésage du fourreau 1 au niveau d'une ses extrémités et un noyau mobile 3 qui est enfilé dans le même alésage du fourreau 1 et qui est mobile axialement à l'intérieur de cet alésage. Le déclencheur comporte en outre un enroulement 4 disposé autour du fourreau 1 et au travers duquel circule un courant électrique devant actionner le déclencheur lorsque son intensité dépasse un seuil prédéterminé. Le déclencheur comporte en outre une culasse fixe 5 sur laquelle est fixé le noyau fixe 2. Le noyau fixe 2 présente une forme générale cylindrique et comporte un alésage axial 6 qui le traverse de part en part. Le noyau mobile 3 présente une forme générale cylindrique et comporte au niveau de son extrémité dirigée vers le noyau fixe 2 un élément de fixation 7 sur lequel est montée de façon fixe une tige de déclenchement 8 qui traverse l'alésage 6 du noyau fixe 2 pour ressortir à l'extérieur au niveau de son extrémité 9 la plus éloignée du noyau mobile 3. Il résulte de cela que l'ensemble formé par le noyau mobile 3, l'élément de fixation 7 et la tige de déclenchement 8 forme une seule pièce mobile qui peut se déplacer axialement entre deux positions extrêmes. Le noyau fixe 2 et le noyau mobile 3 comportent respectivement des faces planes perpendiculaires 10, 11 en regard l'une de l'autre. Le noyau mobile 3 comporte en outre un élément d'amarrage 12 sur lequel est monté un ressort 13 qui exerce en permanence une poussée sur le noyau mobile 3 dans le sens de son écartement par rapport au noyau fixe 2. Lorsqu'un courant électrique circulant dans l'enroulement 4 est inférieur à un seuil prédéterminé, le noyau mobile 3 reste écarté du noyau fixe 2, du fait de l'action du ressort 13, et l'espace séparant les faces 10 et 11 forme un entrefer. Lorsque le courant électrique qui circule dans l'enroulement 4 dépasse ce seuil prédéterminé, le noyau mobile 3 s'approche brusquement du noyau fixe 2 jusqu'à venir en contact avec lui, ce qui provoque le déplacement de la tige 8 dont l'extrémité 9 sort davantage du déclencheur pour venir déclencher l'ouverture d'un contact électrique du disjoncteur (non représenté).Figure 1 shows an electromagnetic trip device of the prior art. This trigger is shown schematically and simplified because such a device is well known and because it is therefore not necessary to describe it in its smallest construction details. Generally, such a known electromagnetic trip device comprises a sheath 1 which has the general shape of a cylindrical tube, a fixed core 2 which is fitted into the bore of the sheath 1 at one of its ends and a movable core 3 which is threaded in the same bore of the sleeve 1 and which is axially movable inside this bore. The trip device further comprises a winding 4 arranged around the sheath 1 and through which an electric current flows which must actuate the trip device when its intensity exceeds a predetermined threshold. The trigger further comprises a fixed cylinder head 5 on which the fixed core 2 is fixed. The fixed core 2 has a generally cylindrical shape and has an axial bore 6 which passes right through it. The movable core 3 has a generally cylindrical shape and comprises at its end directed towards the fixed core 2 a fixing element 7 on which is fixedly mounted a trigger rod 8 which passes through the bore 6 of the fixed core 2 for stand out on the outside at its end 9 furthest from the movable core 3. It follows from this that the assembly formed by the movable core 3, the fixing element 7 and the trigger rod 8 forms a single movable part which can move axially between two extreme positions. The fixed core 2 and the movable core 3 respectively have perpendicular plane faces 10, 11 facing each other. The movable core 3 further comprises a mooring element 12 on which is mounted a spring 13 which permanently exerts a thrust on the movable core 3 in the direction of its separation from the fixed core 2. When an electric current flowing in the winding 4 is less than a predetermined threshold, the movable core 3 remains separated from the fixed core 2, due to the action of the spring 13, and the space separating the faces 10 and 11 forms an air gap. When the electric current flowing in the winding 4 exceeds this predetermined threshold, the movable core 3 abruptly approaches the fixed core 2 until it comes into contact with it, which causes the displacement of the rod 8 whose end 9 comes out more of the trip device to come trigger the opening of an electrical contact of the circuit breaker (not shown).

Dans le déclencheur de l'art antérieur représenté sur la figure 1, on peut constater que sa réalisation et son montage ne sont pas aisés. En effet, la tige de déclenchement 8 doit être enfilée au travers du noyau fixe 2 avant d'être fixée rigidement au niveau de son extrémité gauche sur l'élément de fixation 7 qui se projette axialement vers l'extérieur depuis le noyau mobile 3. Comme de tels déclencheurs électromagnétiques sont généralement très miniaturisés, surtout dans le cas d'appareillages électriques du type basse tension, les éléments mécaniques permettant d'assurer la fixation rigide de la tige de déclen-chement 8 avec le noyau mobile 3 sont très petits et sont une source de difficulté de montage et une source de fragilité mécanique.In the trigger of the prior art shown in Figure 1, it can be seen that its production and assembly are not easy. In fact, the trigger rod 8 must be threaded through the fixed core 2 before being rigidly fixed at its left end on the fixing element 7 which projects axially outward from the movable core 3. As such electromagnetic trip devices are generally very miniaturized, especially in the case of electrical equipment of the low voltage type, the mechanical elements making it possible to ensure rigid attachment of the trip rod 8 with the mobile core 3 are very small and are a source of assembly difficulty and a source of mechanical fragility.

De préférence, l'extrémité 9 de la tige de déclenchement 8 présente un diamètre supérieur au diamètre de l'alésage 6 afin de limiter l'écartement du noyau mobile 3 par rapport au noyau fixe 2. Par conséquent, il est nécessaire dans ce cas de commencer par enfiler la tige de déclenchement 8 au travers de l'alésage 6 du noyau fixe 2 avant de procéder à la fixation rigide de cette tige de déclenchement 8 avec le noyau mobile 3. Cette opération de montage s'est révélée délicate et onéreuse. En outre, un tel déclencheur électromagnétique subit des efforts brutaux ou chocs au niveau ses éléments mobiles constitués par le noyau mobile 3, l'élément de fixation 7 et la tige de déclenchement 8, et ces chocs mécaniques peuvent détériorer rapidement la liaison mécanique entre la tige de déclenchement 8 et le noyau mobile 3.Preferably, the end 9 of the trigger rod 8 has a diameter greater than the diameter of the bore 6 in order to limit the spacing of the movable core 3 relative to the fixed core 2. Consequently, it is necessary in this case to start by threading the trigger rod 8 through the bore 6 of the fixed core 2 before proceeding to rigidly fix this trigger rod 8 with the movable core 3. This mounting operation has proved to be delicate and expensive . In addition, such an electromagnetic trip device undergoes sudden forces or shocks at its movable elements constituted by the movable core 3, the fixing element 7 and the trigger rod 8, and these mechanical shocks can rapidly deteriorate the mechanical connection between the trigger rod 8 and the movable core 3.

La figure 2 représente un déclencheur électromagnétique d'une conception générale semblable à celle illustrée par la figure 1 mais dans lequel le noyau mobile, le noyau fixe et la tige de déclenchement comportent des différences dans leur conception et dans leur procédé de fabrication qui constituent l'originalité de la présente invention.FIG. 2 represents an electromagnetic trip device of a general design similar to that illustrated by FIG. 1 but in which the movable core, the fixed core and the trigger rod have differences in their design and in their manufacturing process which constitute the originality of the present invention.

Sur la figure 2, on distingue un fourreau 1 autour duquel est disposé un enroulement 4 et une culasse 5, toutes ces pièces pouvant être identiques à celles décrites en relation avec le déclencheur électromagnétique de l'art antérieur représenté sur la figure 1. Cependant, ce déclencheur selon l'invention comporte un noyau fixe 20 qui présente un alésage 21 qui le traverse de part en part, une tige de déclenchement 22 qui passe au travers de l'alésage 21 et qui passe au travers d'un trou de passage 23 d'un noyau mobile 24 et qui ressort de l'autre côté du noyau mobile 24 de façon à ce que son extrémité libre 25 constitue un élément d'amarrage d'un ressort 13. On voit que la tige 22 forme une seule pièce, de préférence en matière plastique, depuis son extrémité 25 qui sert d'amarrage au ressort 13 jusqu'à son autre extrémité opposée 26 qui permet de déclencher un contact électrique de disjoncteur (non représenté).In FIG. 2, a sheath 1 can be distinguished around which is wound a winding 4 and a cylinder head 5, all these parts possibly being identical to those described in relation to the electromagnetic trip device of the prior art represented in FIG. 1. However, this trigger according to the invention comprises a fixed core 20 which has a bore 21 which passes right through it, a trigger rod 22 which passes through the bore 21 and which passes through a through hole 23 of a movable core 24 and which emerges from the other side of the movable core 24 so that its free end 25 constitutes a securing element of a spring 13 It can be seen that the rod 22 forms a single piece, preferably made of plastic, from its end 25 which serves as mooring for the spring 13 to its other opposite end 26 which makes it possible to trigger an electrical contact of a circuit breaker (not shown ).

L'ensemble de la tige de déclenchement, c'est-à-dire la tige de déclenchement elle-même 22, et ses deux extrémités opposées 25 et 26, constitue une seule pièce en matière plastique. Cette pièce est en fait surmoulée à l'intérieur du trou de passage 23 qui traverse de part en part le noyau mobile 24. Le fait de surmouler la tige de déclenchement 22 dans le trou de passage 23 du noyau mobile 24 assure une liaison rigide définitive de la tige de déclenchement 22 et du noyau mobile 24. Cette liaison présente d'excellentes caractéristiques mécaniques. L'alésage 21 du noyau fixe 20 présente un diamètre légèrement plus grand que celui de la tige de déclenchement 22 au même niveau, afin de permettre le coulissement de ces deux pièces l'une sur l'autre. Le trou 23 qui traverse le noyau mobile 24 peut présenter une partie évasée au niveau des deux extrémités opposées du trou, de sorte que la tige de déclenchement 22 qui épouse la forme du trou 23 reste solidaire du noyau mobile 24 même s'il n'existe pas de réelle adhérence entre la matière de la tige 22 et celle du noyau mobile 24. Par ailleurs, dans ce cas, la tige 22 présente un diamêtre qui varie sans discontinuité tout le long de la tige, ce qui permet d'augmenter la résistance à la fatigue de cette tige 22 et de diminuer sa fragilité. Cela est d'autant plus important que la tige de déclenchement 22 est de préférence réalisée en matière plastique. D'autre part, la présence de cette tige 22 en matière plastique traversant de part en part à la fois le noyau fixe 20 et le noyau mobile 24 limite la masse de ces deux noyaux qui sont métalliques, ce qui réduit la masse de l'ensemble et ce qui améliore sensiblement la vitesse de déclenchement du disjoncteur.The assembly of the trigger rod, that is to say the trigger rod itself 22, and its two opposite ends 25 and 26, constitutes a single piece of plastic. This part is in fact molded inside the passage hole 23 which passes right through the movable core 24. The fact of overmolding the trigger rod 22 in the passage hole 23 of the movable core 24 ensures a definitive rigid connection the trigger rod 22 and the movable core 24. This connection has excellent mechanical characteristics. The bore 21 of the fixed core 20 has a diameter slightly larger than that of the trigger rod 22 at the same level, in order to allow the sliding of these two parts one over the other. The hole 23 which passes through the movable core 24 may have a flared part at the two opposite ends of the hole, so that the trigger rod 22 which follows the shape of the hole 23 remains integral with the movable core 24 even if it doesn’t there is no real adhesion between the material of the rod 22 and that of the movable core 24. Furthermore, in this case, the rod 22 has a diameter which varies without discontinuity all along the rod, which makes it possible to increase the resistance to fatigue of this rod 22 and to reduce its fragility. This is all the more important since the trigger rod 22 is preferably made of plastic material. On the other hand, the presence of this plastic rod 22 passing right through both the fixed core 20 and the movable core 24 limits the mass of these two cores which are metallic, which reduces the mass of the together and this significantly improves the tripping speed of the circuit breaker.

On va se reporter maintenant aux figures 3 et 4 pour décrire de façon plus spécifique un procédé de fabrication, selon la présente invention, de l'ensemble formé par le noyau fixe 20, le noyau mobile 24 et la tige de déclenchement 22, ces pièces venant d'être décrites en relation avec la figure 2.We will now refer to Figures 3 and 4 to describe more specifically a manufacturing process, according to the present invention, of the assembly formed by the fixed core 20, the movable core 24 and the trigger rod 22, these parts just described in relation to Figure 2.

La figure 3 illustre une première étape du procédé de réalisation d'un tel ensemble. Cette première étape consiste en la réalisation d'un moule particulier (non représenté) qui comprend une empreinte de l'ensemble formé par le noyau fixe 20, le noyau mobile 24 et la tige de déclenchement 22. Les positions relatives de ces trois pièces sont celles qu'elles occupent lorsque les trois pièces 20, 23, 22 sont montées dans le déclencheur alors que le noyau mobile 24 est éloigné du noyau fixe 20 (positions telles que représentées sur la figure 3). Au cours de cette première étape du procédé, on met en place dans un tel moule le noyau fixe 20 et le noyau mobile 24, puis on injecte une matière plastique de moulage qui vient occuper le reste de l'empreinte du moule en se surmoulant contre les noyaux fixe et mobile 20, 24, ce surmoulage s'effectuant simultanément au niveau de l'alésage 21 du noyau fixe 20 et au niveau du trou de passage 23 du noyau mobile 24. La matière plastique ainsi injectée dans le moule constitue la tige de déclenchement 22 du déclencheur électromagnétique. Il résulte de cela que la tige de déclenchement 22 adhère à la fois au noyau fixe 20 et au noyau mobile 24, après démoulage de l'ensemble. L'adhérence de la tige de déclenchement 22 avec le noyau mobile 24 est utile parce qu'elle contribue à assurer la liaison rigide définitive de ces deux pièces.FIG. 3 illustrates a first step in the method of producing such an assembly. This first step consists in producing a particular mold (not shown) which includes an imprint of the assembly formed by the fixed core 20, the movable core 24 and the trigger rod 22. The relative positions of these three parts are those they occupy when the three parts 20, 23, 22 are mounted in the trigger while the movable core 24 is distant from the fixed core 20 (positions as shown in Figure 3). During this first step of the process, the fixed core 20 and the movable core 24 are placed in such a mold, then a plastic molding material is injected which occupies the rest of the mold footprint by being overmolded against the fixed and mobile cores 20, 24, this overmolding taking place simultaneously at the bore 21 of the fixed core 20 and at the passage hole 23 of the mobile core 24. The plastic material thus injected into the mold constitutes the rod trigger 22 of the electromagnetic trigger. It follows from this that the trigger rod 22 adheres both to the fixed core 20 and to the movable core 24, after demolding of the assembly. The adhesion of the trigger rod 22 with the movable core 24 is useful because it contributes to ensuring the final rigid connection of these two parts.

En d'autres termes, on réalise un moule, par exemple un moule en deux parties présentant un plan de joint passant par l'axe longitudinal de la tige de déclenchement 22, ce moule épousant les formes extérieures de l'ensemble des pièces telles que représentées sur la figure 3. Comme les noyaux sont réalisés en métal, afin de remplir leur fonction magnétique, on peut aisément réaliser le moulage de la tige de déclenchement 22, par exemple en utilisant une matière plastique, en choisissant une température de fusion de cette matière plastique qui n'altère pas le noyau mobile 24 et le noyau fixe 20.In other words, a mold is produced, for example a mold in two parts having a joint plane passing through the longitudinal axis of the trigger rod 22, this mold matching the external shapes of all the parts such as shown in Figure 3. As the cores are made of metal, in order to fulfill their magnetic function, it is easy to mold the trigger rod 22, for example using a plastic material, by choosing a melting temperature of this plastic material which does not alter the movable core 24 and the fixed core 20.

Une étape suivante du procédé de fabrication est illustrée par la figure 4. Au cours de cette étape suivante, on effectue le décollage entre le noyau fixe 20 et la tige de déclenchement 22. Pour effectuer ce décollage, il suffit d'exercer une poussée axiale sur le noyau fixe 20 en direction du noyau mobile 24 (flèche F). L'alésage 21 du noyau fixe 20 peut être cylindrique, mais, dans certains cas, il est préférable que cet alésage 21 (comme cela est représenté sur la figure 4) soit légèrement cônique de telle sorte que son diamètre soit plus grand dans sa partie la plus éloignée du noyau mobile 24. Dans ces conditions, le fait de déplacer le noyau fixe 20 en direction du noyau mobile 24 provoque le décollement du noyau fixe 20 par rapport à la tige de déclenchement 22, et laisse apparaître un léger jeu J entre le noyau mobile 20 et la tige de déclenchement 22. De préférencce, la conicité de l'alésage 21 est relativement faible afin que le jeu J reste faible.A next step in the manufacturing process is illustrated in FIG. 4. During this next step, takeoff is carried out between the fixed core 20 and the trigger rod 22. To take off, it suffices to exert an axial thrust on the fixed core 20 in the direction of the movable core 24 (arrow F). The bore 21 of the fixed core 20 may be cylindrical, but, in certain cases, it is preferable that this bore 21 (as shown in FIG. 4) is slightly conical so that its diameter is larger in its part the most distant from the movable core 24. Under these conditions, the fact of moving the fixed core 20 in the direction of the movable core 24 causes the detachment of the fixed core 20 relative to the trigger rod 22, and reveals a slight play J between the movable core 20 and the trigger rod 22. Preferably, the taper of the bore 21 is relatively small so that the clearance J remains weak.

Ensuite, il suffit de monter l'ensemble ainsi constitué par la tige de déclenchement 22, le noyau fixe 20 et le noyau mobile 24, avec les autres pièces classiques qui constituent habituellement un déclencheur électromagnétique, afin de réaliser de la sorte un tel déclencheur électromagnétique, comme cela est illustré par la figure 5. Par conséquent, l'ensemble constitué par la tige de déclenchement 22, le noyau mobile 24 et le noyau fixe 20 peuvent être enfilés au travers d'un fourreau 1 et ensuite, cet ensemble peut être monté sur une culasse 5. Ce montage peut s'effectuer en amenant cet ensemble contre la culasse 5 de façon à ce que le noyau fixe 20 vienne en appui contre la culasse 5 au niveau d'une surface d'appui adaptée 30. Cette opération de montage peut être effectuée en particulier de façon automatique en amenant l'ensemble formé par la tige de déclenchement 22, le noyau fixe 20 et le noyau mobile 24 en face de la culasse 5, puis en déplaçant axialement cet ensemble en direction de la culasse 5 (suivant la flèche H) en exerçant une poussée sur la tige de déclenchement 22, jusqu'à ce que la face d'appui 30 du noyau fixe 20 vienne buter contre la culasse 5. A cet instant, l'effort de réaction de la culasse 5 contre la face 30 du noyau fixe 20 permet d'effectuer le décollement du noyau fixe 20 par rapport à la tige de déclenchement 22. En d'autres termes, on utilise cet effort de réaction d'une manière semblable à l'effort qui est illustré par les flèches F sur la figure 4 afin de provoquer la désolidarisation du noyau fixe par rapport à la tige de déclenchement lors de l'opération de montage. Il résulte de cela que l'ensemble des opérations permettant de réaliser et d'assembler les différentes pièces constituant le déclencheur électromagnétique sont particulièrement simples et économiques. Par conséquent, un tel déclencheur électromagnétique selon l'invention et un tel procédé de fabrication selon l'invention sont particulièrement adaptés à la réalisation de déclencheurs électromagnétiques réalisés en grande série. L'opération de fabrication et l'opération d'assemblage peuvent être effectuées facilement d'une manière entièrement automatique.Then, it suffices to mount the assembly thus constituted by the trigger rod 22, the fixed core 20 and the movable core 24, with the other conventional parts which usually constitute an electromagnetic trigger, in order to produce such an electromagnetic trigger , as illustrated in FIG. 5. Consequently, the assembly constituted by the trigger rod 22, the movable core 24 and the fixed core 20 can be threaded through a sheath 1 and then, this assembly can be mounted on a cylinder head 5. This assembly can be carried out by bringing this assembly against the cylinder head 5 so that the fixed core 20 comes to bear against the cylinder head 5 at a suitable bearing surface 30. This operation mounting can be performed in particular automatically by bringing the assembly formed by the trigger rod 22, the fixed core 20 and the movable core 24 opposite the cylinder head 5, then by moving axially This assembly in the direction of the cylinder head 5 (along arrow H) by exerting a push on the trigger rod 22, until the bearing face 30 of the fixed core 20 abuts against the cylinder head 5. At this instant, the reaction force of the cylinder head 5 against the face 30 of the fixed core 20 makes it possible to detach the fixed core 20 relative to the trigger rod 22. In other words, this reaction force is used in a manner similar to the force which is illustrated by the arrows F in FIG. 4 in order to cause the separation of the fixed core with respect to the trigger rod during the assembly operation. It follows from this that all of the operations making it possible to assemble and assemble the different parts constituting the trigger electromagnetic are particularly simple and economical. Consequently, such an electromagnetic trip device according to the invention and such a manufacturing method according to the invention are particularly suitable for producing electromagnetic trip devices produced in large series. The manufacturing operation and the assembly operation can be carried out easily in a fully automatic manner.

Un tel procédé de fabrication selon l'invention permet d'obtenir un renforcement de la tenue mécanique du percuteur et du noyau mobile. Ce procédé permet en outre d'obtenir un allègement du noyau mobile et par conséquent une augmentation de la vitesse de percussion.Such a manufacturing method according to the invention makes it possible to obtain a reinforcement of the mechanical strength of the striker and of the movable core. This process also makes it possible to obtain a lightening of the mobile core and consequently an increase in the percussion speed.

Au lieu d'utiliser comme matière de moulage une matière plastique, on peut également utiliser dans certaines applications une matière de moulage métallique amagnétique, notamment à base de zinc, par exemple le produit connu commercialement sous la dénomination ZAMAK.Instead of using a plastic material as a molding material, it is also possible in certain applications to use a non-magnetic metallic molding material, in particular based on zinc, for example the product known commercially under the name ZAMAK.

Claims (10)

Procédé de fabrication d'un déclencheur électromagnétique, ce déclencheur comprenant :
   un noyau fixe (20) adapté pour être monté sur une culasse (5) ,
   un noyau mobile (24) pouvant se déplacer entre une position éloignée du noyau fixe et une position rapprochée du noyau fixe, et
   une tige de déclenchement (22) reliée au noyau mobile et s'étendant au travers d'un trou de passage (26) du noyau fixe ;
   ce procédé étant caractérisé en ce qu'il comprend les étapes suivantes :
   réalisation d'un moule comprenant une empreinte d'un ensemble formé par le noyau fixe (20), le noyau mobile (24) et la tige de déclenchement (22), les positions relatives de ces trois pièces étant celles qu'elles occupent lorsque les trois pièces sont montées dans le déclencheur et que le noyau mobile est éloigné du noyau fixe ;
   mise en place dans le moule du noyau fixe (20) et du noyau mobile (24) et injection d'une matière de moulage pour réaliser la tige de déclenchement par surmoulage sur les noyaux fixe (20) et mobile (24), puis démoulage de l'ensemble ainsi constitué ; et
   décollage entre le noyau fixe (20) et la tige de déclenchement (22) qui est surmoulée sur le noyau fixe.Method for manufacturing an electromagnetic trip device, this trip device comprising:
a fixed core (20) adapted to be mounted on a cylinder head (5),
a movable core (24) which can move between a position remote from the fixed core and a position close to the fixed core, and
a trigger rod (22) connected to the movable core and extending through a through hole (26) of the fixed core;
this process being characterized in that it comprises the following stages:
production of a mold comprising an imprint of an assembly formed by the fixed core (20), the movable core (24) and the trigger rod (22), the relative positions of these three parts being those which they occupy when the three parts are mounted in the trigger and the movable core is distant from the fixed core;
placing the fixed core (20) and the mobile core (24) in the mold and injecting a molding material to produce the trigger rod by overmolding on the fixed (20) and mobile (24) cores, then demolding of the assembly thus constituted; and
take-off between the fixed core (20) and the trigger rod (22) which is overmolded on the fixed core. Procédé selon la revendication 1, caractérisé en ce que ladite opération de décollage consiste en l'application d'une force (F) provoquant un déplacement relatif longitudinal entre le noyau fixe (20) et la tige de déclenchement (22).Method according to claim 1, characterized in that said take-off operation consists in the application of a force (F) causing a relative longitudinal displacement between the fixed core (20) and the trigger rod (22). Procédé selon la revendication 2, caractérisé en ce qu'il comprend en outre une étape de montage du noyau fixe (20) contre la culasse (5), cette étape étant obtenue par une saisie de l'ensemble formé par le noyau fixe (20), le noyau mobile (24) et la tige de déclenchement surmoulée (22), cette saisie s'effectuant au niveau du noyau mobile ou de la tige de déclenchement, puis en amenant cet ensemble contre la culasse (5) de façon à provoquer une rencontre avec choc entre le noyau fixe et la culasse, ce choc provoquant à la fois le montage du noyau fixe (20) sur la culasse (5) et le décollage entre le noyau fixe (20) et la tige de déclenchement (22).Method according to claim 2, characterized in that it further comprises a step of mounting the fixed core (20) against the cylinder head (5), this step being obtained by gripping the assembly formed by the fixed core (20 ), the movable core (24) and the overmolded trigger rod (22), this entry being made at the movable core or the trigger rod, then bringing this assembly against the cylinder head (5) so as to cause a meeting with shock between the fixed core and the cylinder head, this shock causing both the mounting of the fixed core (20) on the cylinder head (5) and the takeoff between the fixed core (20) and the trigger rod (22) . Procédé selon la revendication 3, caractérisé en ce que le noyau fixe (20) comporte un alésage (21) sur lequel vient se surmouler la tige de déclenchement (22), cet alésage (21) présentant une forme tronconique qui facilite ledit décollage entre le noyau fixe et la tige de déclenchement.Method according to claim 3, characterized in that the fixed core (20) has a bore (21) on which the release rod (22) is overmolded, this bore (21) having a frustoconical shape which facilitates said take-off between the fixed core and trigger rod. Déclencheur électromagnétique caractérisé en ce qu'il est obtenu par le procédé de fabrication selon l'une quelconque des revendications précédentes.Electromagnetic trip device characterized in that it is obtained by the manufacturing process according to any one of the preceding claims. Déclencheur électromagnétique comprenant :
   un noyau fixe (20) adapté pour être monté sur une culasse (5),
   un noyau mobile (24) pouvant se déplacer entre une position éloignée du noyau fixe et une position rapprochée du noyau fixe, et
   une tige de déclenchement (22) reliée au noyau mobile (24) et passant au travers du noyau fixe (20);
   caractérisé en ce que :
   la tige de déclenchement (22) s'étend à la fois au travers d'un alésage (21) du noyau fixe (20) et au travers d'un trou de passage (23) du noyau mobile (24) et est surmoulée à l'intérieur des noyaux fixe et mobile ;
   d'où il résulte qu'une force (F ; H) provoquant un déplacement relatif longitudinal entre le noyau fixe (20) et la tige de déclenchement (22) peut provoquer un décollage entre le noyau fixe et la tige de déclenchement.Electromagnetic trip unit comprising:
a fixed core (20) adapted to be mounted on a cylinder head (5),
a movable core (24) which can move between a position remote from the fixed core and a position close to the fixed core, and
a trigger rod (22) connected to the movable core (24) and passing through the fixed core (20);
characterized in that:
the trigger rod (22) extends both through a bore (21) of the fixed core (20) and through a through hole (23) of the movable core (24) and is molded inside the fixed and mobile cores;
from which it follows that a force (F; H) causing a relative longitudinal displacement between the fixed core (20) and the trigger rod (22) can cause a takeoff between the fixed core and the trigger rod. Déclencheur électromagnétique selon la revendication 6, caractérisé en ce que la tige de déclenchement est réalisée en matière plastique.Electromagnetic trip device according to claim 6, characterized in that the trigger rod is made of plastic. Déclencheur électromagnétique selon la revendication 6, caractérisé en ce que la tige de déclenchement est réalisée en matière métallique moulable amagnétique, notamment à base de zinc.Electromagnetic trip device according to claim 6, characterized in that the trigger rod is made of non-magnetic moldable metallic material, in particular based on zinc. Déclencheur électromagnétique selon la revendication 6, caractérisé en ce que l'alésage (21) est de forme tronconique.Electromagnetic trip device according to claim 6, characterized in that the bore (21) is of frustoconical shape. Déclencheur électromagnétique selon la revendication 6, caractérisé en ce que la surface interne du trou de passage (23) du noyau mobile (24) présente une section dans une zone centrale inférieure à la section dans les deux zones d'extrémité ;
   d'où il résulte qu'une force exercée axialement entre le noyau fixe et la tige de déclenchement ne peut pas provoquer de décollage entre le noyau mobile et la tige de déclenchement.Electromagnetic trip device according to claim 6, characterized in that the internal surface of the through hole (23) of the movable core (24) has a cross section in a central zone less than the cross section in the two end zones;
where it follows that a force exerted axially between the fixed core and the trigger rod cannot cause takeoff between the movable core and the trigger rod.
EP19920420357 1991-10-14 1992-10-09 Manufacturing process for an electromagnetic trip device with molded-in striker and trip device so obtained Expired - Lifetime EP0538155B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9112726A FR2682532B1 (en) 1991-10-14 1991-10-14 PROCESS FOR THE MANUFACTURE OF AN ELECTROMAGNETIC TRIGGER WITH AN OVER-MOLDED PERCUTTER AND A TRIGGER THUS OBTAINED.
FR9112726 1991-10-14

Publications (2)

Publication Number Publication Date
EP0538155A1 true EP0538155A1 (en) 1993-04-21
EP0538155B1 EP0538155B1 (en) 1997-02-12

Family

ID=9417956

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Application Number Title Priority Date Filing Date
EP19920420357 Expired - Lifetime EP0538155B1 (en) 1991-10-14 1992-10-09 Manufacturing process for an electromagnetic trip device with molded-in striker and trip device so obtained

Country Status (5)

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EP (1) EP0538155B1 (en)
CN (1) CN1026739C (en)
DE (1) DE69217442T2 (en)
ES (1) ES2099236T3 (en)
FR (1) FR2682532B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2753836A1 (en) * 1996-09-23 1998-03-27 Schneider Electric Sa ELECTROMAGNETIC TRIGGER FOR ELECTRIC PROTECTIVE APPARATUS

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005044540A1 (en) * 2005-09-17 2007-03-22 Abb Patent Gmbh Electrical service switching device
DE102007043869B4 (en) * 2007-09-14 2016-02-25 Siemens Aktiengesellschaft Coil carrier and yoke of an electromagnetic release of a protective switching device, electromagnetic release and protective switching device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7017627U (en) * 1970-05-12 1971-11-04 Siemens Ag MAGNETIC QUICK RELEASE.
GB2000379A (en) * 1977-06-27 1979-01-04 Weber Ag Fab Elektro Magnetic trip mechanism for automatic cut-out
EP0041049A2 (en) * 1980-05-28 1981-12-02 Weber AG Fabrik elektrotechnischer Artikel und Apparate Protective line switch
DE8527361U1 (en) * 1985-09-25 1986-01-09 Lindner Gmbh, Fabrik Elektrischer Lampen Und Apparate, 8600 Bamberg Short-circuit release device
EP0369899A1 (en) * 1988-11-16 1990-05-23 Merlin Gerin Magnetic release device with a large capacity to adjust the release area

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7017627U (en) * 1970-05-12 1971-11-04 Siemens Ag MAGNETIC QUICK RELEASE.
GB2000379A (en) * 1977-06-27 1979-01-04 Weber Ag Fab Elektro Magnetic trip mechanism for automatic cut-out
EP0041049A2 (en) * 1980-05-28 1981-12-02 Weber AG Fabrik elektrotechnischer Artikel und Apparate Protective line switch
DE8527361U1 (en) * 1985-09-25 1986-01-09 Lindner Gmbh, Fabrik Elektrischer Lampen Und Apparate, 8600 Bamberg Short-circuit release device
EP0369899A1 (en) * 1988-11-16 1990-05-23 Merlin Gerin Magnetic release device with a large capacity to adjust the release area

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2753836A1 (en) * 1996-09-23 1998-03-27 Schneider Electric Sa ELECTROMAGNETIC TRIGGER FOR ELECTRIC PROTECTIVE APPARATUS
EP0834895A1 (en) * 1996-09-23 1998-04-08 Schneider Electric Sa An electromagnetic trip for an electrical apparatus for protection
US5894257A (en) * 1996-09-23 1999-04-13 Schneider Electric Sa Electromagnetic trip for an electrical apparatus for protection

Also Published As

Publication number Publication date
EP0538155B1 (en) 1997-02-12
DE69217442T2 (en) 1997-07-10
CN1026739C (en) 1994-11-23
FR2682532A1 (en) 1993-04-16
FR2682532B1 (en) 1993-11-26
ES2099236T3 (en) 1997-05-16
CN1071531A (en) 1993-04-28
DE69217442D1 (en) 1997-03-27

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