EP2061055A1 - Switching device equipped with a circuit breaker and a disconnecting switch and comprising shared activation means - Google Patents

Abstract

The apparatus (A) has a circuit-breaker (1) and a disconnector (2) that are fixed to a metallic envelope (3). A driving unit is common for the circuit-breaker and the disconnector. The unit has an insulating drive rod (4) that is moved in translation in a plane in which movable contacts (12, 22) of the circuit-breaker and the disconnector are in translation. The unit has a mechanical assembly that is constituted of a cam (80), a drive link and a deformable rhombus and mounted in the envelope. The assembly has a part driven by the rod by allowing non simultaneous translation of the contacts.

Description

TECHNICAL AREA

The invention relates to the field of switching devices provided with a circuit breaker and a disconnector arranged in a plane.

More specifically, the invention relates to this type of switching apparatus in which the circuit breaker and the disconnector are arranged in a plane and integral with a metal casing, the circuit breaker and the disconnector each comprising a pair of contacts consisting of a fixed contact and a movable contact in translation so as to separate each other during a switch.

The main application is that according to which the circuit breaker and the disconnector are arranged in insulating envelopes each filled with a dielectric gas under a controlled atmosphere, such as SF6.

PRIOR ART

It is known to use devices with two switching units arranged in a plane and fixed to a metal casing, each comprising a movable contact between an open and closed position. One of the two switching units is a circuit breaker having a fixed contact connected to a first terminal of a network, and a second contact movable relative to the first, the two contacts being arranged along an axis. The second switching unit is a disconnector having a fixed contact connected to a second terminal of the network and a movable contact, the two contacts being arranged along another axis.

It is also known to use drive means connected to a motor which make it possible to operate the movable contacts of the circuit breaker and of the disconnector, and where appropriate, to make each of them follow a determined opening and closing sequence.

The patent application EP 1207601 proposes to house a portion of the drive means in the metal casing to which the circuit breaker and the disconnector are attached and to connect them to another part of the drive means in the form of rods themselves housed in a cylinder vertical insulation at the base of which is implanted the engine. Such an arrangement is advantageous insofar as it allows to have a compact device by the implantation of the drive means in the metal casing. On the other hand, the drive means of the circuit breaker are independent of those of the disconnector.

STATEMENT OF THE INVENTION

The object of the invention is then to provide a switching device of the type mentioned above which is compact and which has common drive means to the circuit breaker and the disconnector.

Another object of the invention is to provide common drive means which allow the mobile contacts of the circuit breaker and disconnector to follow their own profile of movement over time, and in particular so that the disconnector is protected during the opening and closing the circuit breaker.

In particular, according to this other purpose, the invention provides a delayed opening of the disconnector relative to that of the circuit breaker and an early closing of the disconnector relative to that of the circuit breaker and thus the return to service of the apparatus.

• une unique tige isolante d'entraînement adaptée pour avoir un mouvement de translation dans le même plan que celui de translation des contacts mobiles,
• un ensemble mécanique monté dans l'enveloppe métallique et dont au moins une partie est entraînée par l'unique tige isolante d'entraînement en permettant la translation non simultanée des deux contacts mobiles,

To do this, the invention relates to a switching apparatus comprising a circuit breaker and a disconnector arranged in a plane and fixed to a metal casing, the circuit breaker and the disconnector each comprising a pair of contacts comprising a fixed contact and a movable contact in translation. so as to mutually separate upon switching, apparatus further comprising drive means common to the circuit breaker and the isolator comprising:

• a single drive insulating rod adapted to have a translation movement in the same plane as that of translation of the moving contacts,
• a mechanical assembly mounted in the metal casing and at least a part of which is driven by the single insulating driving rod by allowing non-simultaneous translation of the two movable contacts,

• au moins une came montée en rotation dans l'enveloppe métallique, la(les) came(s) présentant un profil extérieur (P) et/ou des profils intérieurs permettant la translation non simultanée des deux contacts mobiles en appui contre ou dans la(les) came(s),
• des moyens de rappel logés dans l'enveloppe métallique et adaptés pour maintenir en appui chacun des deux contacts mobiles contre le profil extérieur et/ou dans les profils intérieurs de la(es) came(s) quelle que soit sa (leur) position de rotation.

According to a first embodiment of the invention, the mechanical assembly comprises:

• at least one cam mounted in rotation in the metal casing, the cam (s) having an external profile (P) and / or internal profiles allowing the non-simultaneous translation of the two movable contacts bearing against or in the ( the) cam (s),
• return means housed in the metal casing and adapted to hold each of the two movable contacts in abutment against the outer profile and / or in the internal profiles of the cam (s) whatever its (their) position of rotation.

Advantageously, the outer and / or inner profile of the cam (s) allows both the opening of the contacts of the circuit breaker before that of the contacts of the disconnector and the closing of the contacts of the disconnector before that of the contacts of the disconnector. breaker. This brings about the commissioning of the device using the common control.

Advantageously, the cam is connected to the drive rod by means of a curved rod that allows the rotation of the axis of rotation of the cam.

According to an alternative embodiment, at least one movable contact comprises a shaft provided with a shoulder at its end housed in the metal casing, the return means comprising at least one compression spring coaxial with the shaft and in support of a part against the shoulder and secondly against a part of the metal casing separating it from the disconnector or circuit breaker and through which the shaft passes.

According to another variant embodiment, at least one movable contact comprises a shaft provided at its end with a fork housed in the metal casing, the return means comprising at least one peg internally fixed to one of the branches of the fork and housed in a groove formed at the inner periphery of the cam. This eliminates the need for spring (s) to maintain the support of the movable contact and also the energy required for the compression of the (s) spring (s) when closing contacts.

According to an advantageous variant of the first embodiment, a single cam is rotatably mounted in the metal casing and driven by the insulating driving rod. Thus, few parts are used for the common drive since only one rod and one cam are used.

According to another embodiment, three cams, two of which have the same external profile, are rotatably mounted in the metal casing on the same axis and a single cam is driven by the driving rod, at least one movable contact comprising a shaft. equipped at its end with a fork housed in the metal casing and each of the branches bears against one of the two cams with the same external profile. The use of three cams, two of which have the same profile, makes it possible to open and close the contacts with greater rotation.

Preferably, the outer profile of the cam (s) comprises two continuous curves, such that when the two movable contacts bear against one of the two curves, only the moving contact of the circuit breaker has a translational movement. and when the cam has reached a given rotational position, one of the two movable contacts bears against the other of the two curves.

More preferably, when the cam has reached a rotational position greater than 90 ° with respect to the initial position in which the two contacts are closed, the moving contact of the circuit breaker bears on one of the curves while the moving contact disconnector is resting on the other curves.

According to an alternative embodiment, at least one movable contact comprises a shaft at the end of which is mounted a roller so as to have a bearing against the outer profile of the (the) cam (s). This increases the efficiency of the drive by reducing the friction since the sliding friction of the direct bearing contact against or in the cam is replaced by rolling friction of the roller against the outer profile of the (the) cam (s) .

• quatre biellettes de longueur figée articulées entre elles en formant un losange, un des sommets du losange étant solidaire du contact mobile du disjoncteur,
• une bielle d'entrainement ayant une extrémité solidaire de la tige isolante d'entrainement et une autre extrémité solidaire du sommet du losange opposé à celui solidaire du contact mobile de disjoncteur,
• des moyens d'accouplement entre le contact mobile du sectionneur et la bielle,
• des moyens pour faire varier la forme du losange dans le plan du disjoncteur et du sectionneur lors de son entraînement par la tige; le losange, la bielle d'entraînement, les moyens d'accouplement et les moyens de variation de forme du losange étant agencés entre eux pour permettre la translation non simultanée du sommet du losange solidaire du contact mobile du disjoncteur et du contact mobile du sectionneur accouplé avec la bielle.

According to a second embodiment of the invention, the mechanical driving assembly comprises:

• four links of fixed length articulated together forming a rhombus, one of the vertices of the diamond being secured to the moving contact of the circuit breaker,
• a driving rod having an end secured to the insulating driving rod and another end integral with the apex of the diamond opposite to that secured to the moving contact of the circuit breaker,
• coupling means between the movable contact of the disconnector and the connecting rod,
• means for varying the shape of the diamond in the plane of the circuit breaker and the disconnector during its driving by the rod; the rhombus, the drive rod, the coupling means and the diamond shape variation means being arranged between them to allow non-simultaneous translation of the apex of the diamond integral with the movable contact of the circuit breaker and the movable contact of the coupled disconnector with the connecting rod.

The solution according to this second embodiment makes it possible to minimize the maneuvering energy.

According to a variant, the coupling means comprise a groove secured to the connecting rod and having a non-rectilinear profile, a roller integral with the movable contact of the disconnector and mounted in the groove of the connecting rod, the groove being arranged to allow the sliding of the roller in the groove over the entire stroke of the drive rod but its translation on only a part of this race.

• sur une première course de translation de la tige d'entrainement, le losange se déplace dans le sens de la tige d'entrainement en gardant une forme identique et le galet d'accouplement coulisse dans la rainure d'accouplement sans translation du contact mobile du sectionneur et,
• sur une deuxième course de translation de la tige d'entrainement continue à la première course, le sommet du losange solidaire du contact mobile du disjoncteur reste immobile, tandis que sa forme varie et le galet d'accouplement coulisse dans la rainure d'accouplement avec translation du contact mobile du sectionneur.

To allow both the opening of the contacts of the circuit breaker before that of the switch contacts and the closing of the contacts of the disconnector before that of the contacts of the circuit breaker, the articulated diamond and the connecting rod are arranged between them such that:

• on a first translational stroke of the drive rod, the diamond moves in the direction of the drive rod keeping an identical shape and the coupling roller slides in the coupling groove without translation of the movable contact of the disconnector and,
• on a second translational stroke of the continuous drive rod at the first stroke, the apex of the diamond integral with the moving contact of the circuit breaker remains stationary, while its shape varies and the coupling roller slides in the coupling groove with translation of the movable contact of the disconnector.

• un axe fixé à la bielle,
• un levier d'accouplement monté en rotation dans l'enveloppe métallique et comprenant une lumière ayant un profil non rectiligne dans laquelle l'axe fixé à la bielle est monté,
• une biellette d'accouplement articulée entre le levier d'accouplement et le contact mobile du sectionneur; l'axe, le levier d'accouplement et la biellette d'accouplement étant agencés entre eux pour permettre le coulissement de l'axe dans la lumière sur toute la course d'entraînement de la tige mais le pivotement du levier sur seulement une partie de cette course. Un galet peut être monté sur l'axe afin d'avoir un accouplement avec roulement.

According to another variant, the coupling means comprise:

• an axis attached to the connecting rod,
• a coupling lever rotatably mounted in the metal casing and comprising a light having a non-rectilinear profile in which the axis attached to the connecting rod is mounted,
• a coupling linkage articulated between the coupling lever and the movable contact of the disconnector; the shaft, the coupling lever and the connecting rod being arranged between them to allow the sliding of the axis in the light over the entire driving stroke of the rod but the pivoting of the lever on only a part of this course. A roller can be mounted on the shaft to have a bearing coupling.

• deux rainures de guidage non rectilignes comprenant chacune une première portion droite et une deuxième portion droite en continuité de la première portion droite, les rainures étant agencées entre elles tel que les premières portions droites sont parallèles entre elles et les deuxièmes portions droites convergent l'une vers l'autre,
• deux galets de guidage solidaires chacun d'un autre sommet du losange lui-même non solidaire des contacts mobiles du disjoncteur et du sectionneur et adaptés pour être montés chacun dans une des deux rainures de guidage non rectilignes, le losange et les rainures de guidage étant agencés entre eux tel que :
  • sur la première course de translation de la tige d'entrainement, les galets de guidage coulissent chacun dans les premières portions droites des rainures de guidage en maintenant la forme identique du losange,
  • sur la deuxième course de translation de la tige d'entrainement continue à la première course, les galets de guidage coulissent chacun dans les deuxièmes portions droites des rainures de guidage en faisant ainsi varier la forme du losange.

According to one variant, the means for varying the shape of the rhombus comprise:

• two non-rectilinear guide grooves each comprising a first straight portion and a second straight portion in continuity with the first straight portion, the grooves being arranged between them so that the first straight portions are parallel to each other and the second straight portions converge one to the other; towards the other,
• two guide rollers integral with each other of the diamond itself not integral with the movable contacts of the circuit breaker and the switch and adapted to be mounted each in one of the two non-rectilinear guide grooves, the diamond and the guide grooves being arranged between them such as:
  • on the first translation stroke of the drive rod, the guide rollers each slide in the first straight portions of the guide grooves while maintaining the identical shape of the rhombus,
  • on the second translational stroke of the continuous drive rod in the first stroke, the guide rollers each slide in the second straight portions of the guide grooves thereby varying the shape of the rhombus.

• une paroi fixée à l'intérieur de l'enveloppe métallique,
• une barre creuse dont une extrémité est solidaire du contact mobile du disjoncteur et dont l'autre extrémité est munie à sa périphérie de trous débouchant dans lesquels sont montées des billes et est de forme adaptée pour être entourée par la paroi fixe,
• une barre dont une extrémité est solidaire de la bielle d'entraînement et dont l'autre extrémité comprend des cavités formant calottes sphériques et est de forme adaptée pour être emboîtée en partie dans la barre creuse,
• deux rainures de guidage rectilignes agencées entre elles en convergeant l'une vers l'autre;
• deux galets de guidage solidaires chacun d'un autre sommet du losange lui-même non solidaire des contacts mobiles du disjoncteur et du sectionneur et adaptés pour être montés chacun dans une des deux rainures de guidage, le losange, la paroi fixe, les barres et les rainures de guidage étant agencés entre eux tel que :
  • sur la première course de translation de la tige d'entrainement, les barres sont solidaires entre elles par le blocage latéral des billes d'une part, par la paroi fixe et d'autre part, par les calottes sphériques, la forme du losange étant ainsi maintenue,
  • au début de la deuxième course de translation de la tige d'entrainement continue à la première course, les barres sont désolidarisées l'une de l'autre par le déblocage latéral des billes du côté de la paroi fixe.
  • sur la fin de la deuxième course, les galets de guidage coulissent chacun dans les rainures de guidage rectilignes et convergentes en faisant ainsi varier la forme du losange.

According to another variant, the means for varying the shape of the rhombus comprise:

• a wall fixed inside the metal casing,
• a hollow bar whose one end is integral with the movable contact of the circuit breaker and whose other end is provided at its periphery with holes opening in which are mounted balls and is shaped to be surrounded by the fixed wall,
• a bar whose one end is secured to the drive rod and whose other end comprises spherical cap cavities and is shaped to be fitted in part in the hollow bar,
• two rectilinear guide grooves arranged between them converging towards one another;
• two guide rollers each secured to another vertex of the rhombus itself not integral with the movable contacts of the circuit breaker and the disconnector and adapted to be each mounted in one of the two guide grooves, the rhombus, the fixed wall, the bars and the guide grooves being arranged between them such that:
  • on the first translational stroke of the drive rod, the bars are secured to each other by the lateral blocking of the balls on the one hand, by the fixed wall and on the other hand by the spherical caps, the shape of the diamond being thus maintained,
  • at the beginning of the second travel of the continuous drive rod in the first race, the bars are separated from each other by the lateral release of the balls on the side of the fixed wall.
  • at the end of the second race, the guide rollers each slide in the rectilinear and convergent guide grooves, thereby varying the shape of the rhombus.

BRIEF DESCRIPTION OF THE DRAWINGS

The features and advantages of the invention will be better understood on reading the following detailed description given for information only and with reference to the accompanying drawings.

The figure 1 is a sectional view of a switching apparatus according to a first embodiment of the invention.

The Figure 1A is a detail view showing the inside of the metal casing in which are housed a part of the drive means of the switching device according to the figure 1 .

The figure 2 is a detail view showing an alternative embodiment of a portion of the drive means of a switching apparatus according to the first embodiment of the invention.

The Figures 3A to 3D are sectional views showing the different positions obtained during a switching opening sequence by the drive means of a switching device according to the figure 1 .

The figure 4 is a schematic perspective view of an alternative embodiment of the drive means of a switching apparatus according to the first embodiment of the invention.

The figure 5 is a sectional view of another alternative embodiment of the drive means of a switching apparatus according to the first embodiment of the invention.

The Figure 5A is a detail view showing an alternative embodiment of part of the means driving a switchgear according to the figure 5 .

The figure 6 is a schematic front view of a switching apparatus according to a second embodiment of the invention.

The Figures 7A to 7D are sectional views showing the different positions obtained during a switching opening sequence by the drive means of a switching device according to the figure 6 .

The Figures 8A and 8B are two detailed views showing two different positions according to an alternative embodiment of a portion of the drive means of a switching apparatus according to the second embodiment of the invention.

The Figures 9A to 9C are detail sectional views showing an alternative embodiment of another part of the drive means of a switching apparatus according to the second embodiment of the invention.

The figure 10 shows the separation curves of the contacts of a disconnector and a circuit breaker belonging to a switching device according to the two embodiments of the invention shown in FIGS. Figures 1 to 9 .

The figure 11 shows the opening races of the movable contacts of a disconnector and a circuit breaker according to the times of the figure 10 .

DETAILED PRESENTATION OF PARTICULAR EMBODIMENTS

The following figures show a switching device A according to the invention which makes it possible to perform the switching of a single pole. It goes without saying that the arrangement described hereinafter of a switching apparatus can be repeated for each pole in the case of a multipole combination.

As schematized on the figure 1 , the switching device A comprises a circuit breaker 1 and a disconnector 2 arranged in a coplanar manner. This circuit breaker 1 and this disconnector 2 are integral with a metal shell or tank 3 filled with air here. The circuit breaker 1 is arranged in an insulating cylinder 10, the disconnector 2 is also arranged in an insulating cylinder 20 and the driving rod 4 is arranged in an insulating cylinder 40. In the two illustrated embodiments, the insulating cylinders 10 , 20 and 40 constitute the same closed volume and filled with a gas with high dielectric strength. The nature and the pressure of the gas are therefore the same inside these three cylinders.

The mounting of the insulating cylinder 10 of the circuit breaker 1 on the metal casing 3 is carried out in the following manner: the casing 3 is connected, via a metal cover 51, to a shell 5, connected via the a metal cover 52 to the cylinder 10 of the circuit breaker 1, itself connected to a first terminal of the network 53.

The insulating cylinder 20 of the disconnector 2 is mounted on the metal casing in a similar manner: the casing 3 is connected by via a metal cover 61, to a ferrule 6, connected via a metal cover 62 to the disconnecting cylinder 2, itself connected to a second terminal of the network 63.

Finally, the mounting of the insulating cylinder 40 of the insulating driving rod 4 on the metal casing 3 is similarly carried out: the casing 3 is connected, via a metal cover 71, to a ferrule 7 , itself connected via a metal cover 72 to the cylinder 40 of the drive 4.

Inside the cylinder 10 of the circuit breaker 1 is a breaking chamber 100. Such a breaking chamber 100 comprises a first fixed contact 11, connected to the terminal 53 of the network and a second contact 12, longitudinally movable along a first axis AA 'with respect to the first contact 11. This breaking chamber 100 is electrically connected in series with the disconnector 2 via the metal casing 3.

The disconnector 2 comprises inside its insulating cylinder 20 also a breaking chamber 200. This breaking chamber 200 comprises a first fixed contact 21, connected to the terminal 63 of the network and a second contact 22, longitudinally movable according to a second BB 'axis relative to the first contact 21.

Preferably, the two axes AA 'and BB' are at right angles to one another. Each of the movable contacts 12, 22, ends with a longitudinal shaft 13, 23 ( figure 1 ).

The shafts 13, 23 extend the movable contacts 12, 22 and are connected to a mechanical assembly 8, forming part of the drive means.

This mechanical assembly 8 of the common drive means can be actuated from outside the casing 3, by an insulating rod 4 in longitudinal translation to the axis AA '. The longitudinal displacement of the drive rod 4, along the axis AA ', is transformed into rotation of the axis 81.

Indeed, a link 82 fixed in rotation by pivot connection on the one hand to the cam 80 itself fixed in rotation by fitting to the axis 81 and on the other hand to the drive rod 4. The link 82 is of circular shape so as not to come into contact with the axis 81 and thus allows the alignment of the axis of translation of the connecting rod 4 with that AA 'of translation of the contact 11 of circuit breaker 1.

The rotating cam 80 transmits a longitudinal displacement of the shafts 13, 23, kept in contact with the external profile of the cam 80 via the springs 14, 24 ( Figure 1A ).

The cam 80 with an external profile, therefore generates a thrust force of the shafts 13, 23 and thus the closure of the pairs of contacts 11, 12 and 21, 22 respectively along the axis AA 'and BB'.

The springs 14,24, in turn, generate an opening thrust force of the pairs of contacts 11,12 and 21,22, which as opposed to that generated by the outer profile of the cam 80 is similar to a pulling force of the shafts 13, 23 still along the same axes AA 'and BB'.

The movement between the cam 80 and the shafts 13, 23 is transmitted by direct contact, ie by friction ( Figures 1, 1A ), or by indirect contact via a roller 130 mounted at the shaft end 13 ( figure 2 ). The direct contact induces a resisting torque on the cam 80 due to friction, thereby causing a loss of energy dissipated in the form of heat in the two parts 13 or 23 and 80 in contact while the use of a roller 15 allows to increase the efficiency by reducing friction by substitution of sliding friction in rolling friction.

The inner profiles P1, P2 ( Figure 5A ) or the outside one P ( Figure 1A ) of the cam 80 determine the longitudinal translation movement and the lifting of the shafts 13, 23 as well as the opening time (see timing diagram in figure 6 ).

In order to optimize the operation of the circuit breaker 1, the movement of the movable contact 12 preferably follows a time diagram as shown in FIG. figure 6 .

When actuated at t0 of the command to interrupt the current, the driving of the insulating link 4 in translation along the axis AA 'ensures the driving of the cam 80 in rotation about its axis 81 perpendicular to both to AA 'and BB'.

The rotation of the cam 80 drives the shaft 13 in translation along the axis AA 'until the opening complete of the contacts 11 and 12 of the circuit-breaker 1 ( Figures 3A and 3B The first part of the rotation θ makes it possible to separate the contacts 11, 12 at the end of the time t0, the second part of the rotation allows the extinction of the electric arc and the complete separation of the contacts 11, 12 at the end of the time t1. During this rotation, the shaft 23, connected to the disconnector, is in contact with a portion of the profile of the cam 80 forming a circular arc centered on the axis of rotation 81 thus leaving the disconnector in the closed position.

Furthermore, in order not to solicit the disconnector 2 to constraints other than those which are applied to it during normal operation on an electrical network, the drive means 4, 8, 80, 81, 82 enable opening the contacts 21, 22 of the disconnector 2 after the complete opening of the circuit breaker 1 and leaving a dead time between the full opening of its contacts and the beginning of the movement of the disconnector 2.

A complementary rotation of an angle θ1 ( figure 3C ), during which the shafts 13 and 23 both remain on a profile of the cam 80 in a circular arc centered on the axis of rotation 81, allows the circuit breaker 1 to remain in the open position and the disconnector 2 in the closed position.

The opening of the disconnector is carried out by continuing the rotation of the cam 80 by a complementary angle θ2 ( 3D figure ). During this rotation, the shaft 13 remains in contact with a profile of the cam 80 in an arc centered on the axis of rotation 81, leaving the circuit breaker 1 in the open position and the shaft 23 follows a suitable profile allowing the gradual opening of the disconnector until the opening of the contacts 21,22 at the end of time t3 and its setting to the open position at the end of rotation at the end of time t4.

Similarly, when the network is put back into service and thus when the contacts 11, 12 and 21, 22 are closed, the translation of the driving rod 4, in the direction opposite to the first, drives the cam 80 in rotation in a direction opposite to the first.

The rotation of the cam 80 by an angle θ2 drives the shaft 23 in translation along the axis BB 'until the contacts 21, 22 of the disconnector 2 are completely closed. Then, the rotation of the cam 80 continues on an angle θ1 leaving the disconnector 2 in the closed position and the circuit breaker 1 in the open position. The complementary rotation of the cam 80 according to the angle θ ensures the complete closure of the circuit breaker 1.

According to an alternative embodiment of the first mode illustrated in figure 1 , 1A , 2 and 3A to 3D , a single cam 80 makes it possible to realize the laws of lifting of the shafts 13,23 and thus of the pairs of contacts 11,12 and 21,22.

The cam 80 then has a particular external profile P allowing the opening of the contacts 11,12 of the circuit breaker 1 on θ ° of rotation, by means of the thrust of the spring 14 on the shaft 13, while the shaft 23 is at rest and that by therefore the contacts 21,22 remain closed ( Figure 3A and 3B ).

Then, on θ1 ° of additional rotation of the cam 80, the shafts 13, 23 are both at rest leaving the contacts 11,12 of the circuit-breaker open and the contacts 21,22 of the disconnector closed ( figure 3C ).

Finally, on θ2 ° further rotation of the cam 80, the shaft 13 remains at rest leaving the contacts 11,12 of the circuit breaker open while the contacts 21,22 of the disconnector open through the thrust of the spring 24 on the tree 23 ( 3D figures ).

The opening of the contacts 11, 12 and that of the contacts 21, 22 is therefore effected, in the embodiment shown in FIGS. figures 1 , 1A , 2 and 3A to 3D on θ + θ1 + θ2 ° of rotation of the cam 80.

The closing of the pairs of contacts 11, 12 and 21, 22 is performed in a similar manner on the inverse rotation θ 2 ° of the cam 80, the outer profile of said cam 80 causes a thrust on the shaft 23, thus compressing the spring 24 while closing the contacts 21,22 of the disconnector 2 while the shaft 13 remains at rest, leaving the contacts 11,12 of the circuit breaker 1 open.

On θ1 ° of inverse rotation of the cam 80, the shafts 13,23 remain at rest, leaving the contacts 21,22 of the disconnector 2 closed and the contacts 11,12 of the circuit breaker 1 open.

Finally, on θ ° of inverse rotation of the cam 80, the shaft 23 remains at rest leaving the contacts 21,22 of the disconnector 2 closed while the profile outside the cam 80 generates a thrust on the shaft 13, thus compressing the spring 14 while closing the contacts 11,12 of the circuit breaker 1.

The closing of the contacts 11, 12 and 21, 22 thus also takes place on the counterclockwise rotation of the cam 80.

According to a variant of the first embodiment shown in Figures 5 and 5A it is possible to use only one particular cam 80 'with a double inner profile P1, P2.

According to this variant, it is not only necessary to overcome the need for the springs 14 and 24 to hold the shafts 13, 23 in abutment with the cam 80, but also the energy necessary for the compression of these same springs, when closing. pairs of contacts 11,12 and 21,22.

Indeed, this cam 80 'has not only an inner profile P1 exerting a thrust force during the closure of the contact pairs 11,12 and 21,22, but also an inner profile P2 homothetic to P1 and exerting a pulling force when opening these contact pairs 11,12 and 21,22. In this embodiment, the shafts 13 and 23 therefore have the same geometrical characteristic, namely that their end bearing with the cam 80 'is fork-shaped (reference 13F for the fork of the shaft 13 on the figure 5 ) to bind to the latter by a pin 83 so as to be guided between the inner profile P1 and the inner profile P2.

In this variant embodiment of the first mode ( Figures 5 and 5A ), the transmission of movement between the cam 80 'and the shafts 13 and 23 is therefore performed by the frictional support of the pin 83 between the profiles P1 and P2. The nature of this support is therefore preponderant in the performance of this mechanism.

According to another variant embodiment of the first embodiment, two types of cams 80 '' and 80 '''integral with the same axis of rotation 81, as shown schematically in FIG. figure 4 , allow the realization of the laws of raising of the trees 13 and 23.

A first type of cam 80 "realizes the law of lifting of the shaft 23 and thus of the contacts 21, 22 while a second type of cam 80 '' 'realizes the law of raising of the shaft 13 and thus of the contacts 11,12 To do this, two cams 80 '' 'of the second type, placed on either side of the first type of cam 80' ', are in abutment with a follower 130 integral with the shaft 13, shaped fork and in translation along AA ', while the first type of cam 80 "bears with a follower shaft 230 integral with the shaft 23 and in translation along BB'. Given the efforts to deploy to operate the circuit breaker 1, it is better to operate the circuit breaker 1 by 2 cams 80 '' 'and the disconnector by 80' '.

The cam 80 '' 'has a profile determined to cause the opening of the circuit breaker 1 on a rotation angle θ. On the complementary rotation θ1 then θ2 the circuit breaker 1 remains in the open position.

The cam 80 '' has a determined profile to maintain the disconnector 2 in the closed position on the rotation θ then on θ1 and, to open the contacts 21, 22 of the disconnector 2 on a complementary rotation θ2.

The two types of cams 80 '' and 80 '' 'are assembled on the same axis 81. The rotation in the opposite direction causes the closing of the disconnector 2 then closing the circuit breaker 1.

The second embodiment of the invention illustrated in Figures 6 to 9 will now be explained.

For the sake of clarity, the circuit breaker and the disconnector and their associated contacts have the same references as in the first mode.

The second embodiment is based on the use of a deformable rhombus 9 and a rod 90 secured to the drive rod 4 and coupled to the movable contact 22 of the disconnector 2.

The mechanical assembly thus provided (deformable rhombus 9 and driving rod 90) makes it possible to transmit the movement of the driving rod 4 to the circuit breaker 1. The diamond 9 thus retains a fixed shape during the entire race used for opening circuit breaker 1 ( Figures 7A and 7B ), then it deforms so that, over the rest of the drive stroke, circuit breaker 1 remains in the fully open position ( Figures 7C and 7D ) and thus allows the opening of the disconnector 2 ( Figure 7D ).

The mechanical assembly firstly comprises a rhombus 9 formed by four rods 92, 93, 94, 95 of fixed length and hinged together. One of the vertices 9i is connected to a shaft 13 secured to the movable contact 12 of the circuit breaker 1. The apex 9j opposite the apex 9i is connected to one end 901 of the connecting rod 90, the other end 902 is coupled directly to the driving rod 4 for maneuvering. At each of these other two vertices 9k, 91 of the rhombus 9, are fixed guide rollers 96, 97. The articulated links of the links 92, 93, 94, 95 to the four vertices 9i, 9j, 9k, 91 of the rhombus 9 allow a rotational movement.

The mechanical assembly also comprises two identical guide grooves 960, 970 made inside the metal casing, not shown, but similar to the metal casing 3.

The drive rod 90 has a groove 900 whose profile is not rectilinear and changes at a certain height on the connecting rod 90.

A roller 98 is mounted in the groove 900 of the rod 90 and rolls therein. The coupling roller 98 is mounted at the end of a shaft 23 integral with the movable contact 22 of the disconnector.

During the opening operation, in the first phase, the circuit breaker 1 and the disconnector 2 are in the closed position ( Figure 7A ). By actuating the single insulating driving rod 4, that is to say by translating it vertically downwards, the driving rod 90 goes down, and the coupling roller 98 remains on a straight portion of the groove 900, leaving the disconnector 2 in the closed position. The driving rod 90 drives the diamond 9 downwards ( Figure 7B ).

Non-rectilinear guide grooves 960, 970 are arranged between them with their straight portions 960d, 970d parallel to each other. Due to this arrangement, the distance between the rollers 96 and 97 remains constant and the diamond 9 remains indeformable during this first phase ( Figure 7A ). In other words, the displacement of the lower vertex 9j is identical to that of the upper vertex 9i of the rhombus 9. The movable contacting shaft 13 of the circuit breaker 1 thus performs, by rigid connection of the indeformable rhombus 9, a displacement identical to that of the driving rod 90.

The movement continues until circuit breaker 1 is fully open (Fig. 7B). At this time, the guide rollers 96 and 97 are each in a zone of the associated guide groove 960, 970 in which it changes orientation to take an angle of convergence between them, typically of the order of 45 °. At this time also, the coupling roller 98 is still in contact with the lower right profile of the groove 900.

The movement of the driving rod 4 then continues downwards, which deforms the diamond 9 under the action of the rollers 96 and 97 which come closer since sliding in the portion of the grooves right but inclined 960di, 970di in convergence each towards the other. The angle of inclination α of the inclined portions 960di, 970di is advantageously calculated so that the upper vertex 9i remains in a fixed position while the lower vertex 9j continues its downward path). Thus, the contacts 11, 12 of the circuit breaker 1 remain in the open position ( Figure 7C ).

Immediately after the guide rollers 96 and 97 have come together, typically in a time of the order of 10 ... ms, the coupling roller 98 follows the straight and inclined profile 900di of the groove 900, which allows the progressive opening of the contacts 21, 22 of the disconnector 2 without the contacts 11, 12 of the circuit breaker 1 do not move ( Figures 7C and 7D ). At the end of the race of the driving rod 4, the disconnector 2 and the circuit breaker 1 are both in the open position ( Figure 7D ).

During the closing operation, the operations are carried out in the opposite direction. At first, the disconnector 2 is closed ( Figure 7C ) then, when the disconnector 2 is closed ( Figure 7B ), the travel of drive rod 4 continues to close circuit breaker 1 ( Figure 7A ).

The change of direction of the guide grooves 960 and 970, from the vertical position 960d, 970d, to the inclined and convergent position 960di, 970di, typically at an angle of 45 ° with respect to the portions 906d, 970d can be advantageously progressive so that the movement at the end of the opening race of the circuit breaker 1 is sufficiently damped. That said, in the construction of the guide grooves 960, 970, it is possible that the change of direction also causes a slight rebound at the end of the stroke of the order of a few mm (less than 10 mm) of the contacts 11, 12 of the circuit breaker 1, which, in any case, remains compatible with the breaking and dielectric performance of circuit breaker 1.

In the description above, the coupling roller 98 is directly connected to the rod 23 of operating the disconnector, it therefore performs an identical race when opening and closing the disconnector 2. The length of this race is given by the combination of the stroke of the rod 90 and the slope of the groove 900 (angle between the portion 900d and the inclined portion 900di).

In order to reduce the travel necessary to open the disconnector 2, it is possible to advantageously replace the roller 98 secured to the shaft 23 of the movable contact 22 of the disconnector 2 and the groove 900 integral with the rod 9 in which it slides.

This replacement consists in providing an axis 98 'fixed to the driving rod 90 and a lever 99' rotatably mounted around a fixed point 30 of the metal casing and articulated by a coupling rod 99 '' to the movable shaft 23 of the disconnector 2, as shown in FIG. figure 8 .

The lever 99 'is rotatably mounted comprises a light 990' in which the axis 98 'is mounted.

During the entire opening phase of circuit breaker 1 (corresponding to the upper part of Figures 7A and 7B ), the axis 98 'slides in the light 990' oriented vertically, which does not cause the displacement of the coupling rod 99 "and therefore the translation of the movable contact 22 of the disconnector 2 ( figure 8A ).

In a second opening phase of the disconnector 2 (corresponding to the right part of the Figures 7C and 7D ), the axis 98 'bears against the light in an area in which it changes from profile, which pivots the lever 99 'around the point of rotation 30 ( Figure 8B ).

Thus, the disconnector 2 opens by the translational movement of the connecting rod 2, pivoting of the lever 99 'and the link 99''. The ratio of length L2 / L1 (that is to say the ratio between the distance between the point of rotation 30 of the lever and the point of articulation of the link 99 '' and the distance separating the point of rotation 30 of the lever and the axis 98 'secured to the connecting rod 90) is adapted so that the movable contact 22 of the disconnector 2 is displaced on a displacement path of the reduced connecting rod 90 ( figure 8 ).

During the operation of the circuit breaker 1 by means of the connecting rod 90, the maneuvering forces that apply (kinetic forces, pressure forces, friction) are translated at the rhombus 9 which transmits the movement, as shown in FIGS. Figures 7 to 7D , by a pressure force of the rollers 96 and 97 in the associated guide grooves 960, 970. These pressure forces generate additional rolling and friction forces which can be important.

In order to reduce the effects while making it possible to vary the shape of the rhombus, it may be envisaged to add a connection device between the upper vertex 9i and the lower vertex 9j of the rhombus 9. This complementary linking device has the function of making the 13 and the drive rod 90 during the entire opening phase of the circuit breaker and to separate them from one another to allow the diamond 9 to deform during the entire opening phase of the disconnector 2. It is also envisaged in combination with this complementary connecting device, to shorten the guide grooves 960, 970 so that the rollers 96 and 97 slide and exert only a pressure force inside them only during the closing phase of the disconnector 2.

This alternative embodiment of the complementary connecting device and shortened guide grooves is shown on the Figures 9A to 9C .

A hollow bar 131 is provided with one end 1310 secured to the shaft 13 of the movable contact 12 and the other end 1311 is provided at its periphery with holes 1312 opening in which are mounted balls 1313. The number of holes 1312 depends on the effort to be transmitted between the hollow bar 131 and the connecting rod 90.

Another bar 90 'has one end 900' integral with the drive rod 90 and another end 901 'which is shaped to fit partially into the hollow bar 131 and is provided with spherical cap cavities 9010'. .

In the closed position of circuit breaker 1 ( Figure 9A ), the portion 901 'of the bar 90' is nested in the hollow bar 131 and abuts against a shoulder 9011 'formed at the end 901' of the bar 90 '.

A wall 31 is fixed inside the metal casing and whose arrangement allows any first to obstruct the holes 1312 on a portion of the stroke of the drive rod 4, and thus the lateral locking of the balls 1313 on the one hand by the fixed wall 31 and on the other hand by the spherical caps 9010 '( Figure 9A ). The bar 131 and the bar 90 'are thus integral in translation downwards and the shape of the rhombus 9 is locked.

The wall 31 has a recess 310 forming a clearance arranged such that at the end of the opening of the circuit breaker 1, the balls 1313 are found opposite the clearance 310 and, the pressure forces exerted by the spherical caps 9010 'expel the balls towards this clearance, according to the arrow of the Figure 9B . The bar 90 'and therefore the rod 90 are thus detached from the shaft 13, while remaining connected via the rhombus 9, which allows to continue the operation of the disconnector 2 while still holding the circuit breaker 1 ( Figure 9C ). During this operation of the disconnector 2, the guide rollers retract and then slide in the shortened, inclined and convergent grooves towards each other, which bring said rollers closer together and deforms the rhombus 9.

The Figures 10 and 11 illustrate the opening and closing sequences followed by the contacts of the disconnector and the circuit breaker of the switching devices according to the two previously detailed embodiments.

On the figure 10 the instant t0 represents the opening order given to the control of the circuit-breaker connected to the driving rod 4. At the end of the time t0, typically of the order of 17 to 30 ms, the contacts 11, 12 of the circuit breaker 1 separate.

The complete opening of the circuit breaker 1 occurs after the time t1 (corresponding to the rotation of the angle θ of the first embodiment). During a given time (t2-t1) the circuit breaker 1 and the disconnector 2 remain stationary (corresponding to the rotation of an angle θ1 of the first embodiment).

At the end of time t2, (corresponding to the end of the angle rotation θ1 of the first embodiment), the disconnector 2 starts its opening stroke.

At the end of time t3 the contacts 21, 22 of the disconnector 2 open and this is found in fully open position at the end of the time t4 (corresponding to the rotation of the cam of the complementary angle θ2 in the first mode of production).

On the figure 11 , the total opening stroke d of the moving contact 12 of the circuit breaker 1 (continuous curve) is represented as being greater than that of the contact 22 of the disconnector 2 (dashed curve) by a ratio greater than 1, typically equal to 80 mm / 60mm.

• d'une part, une durée totale d'ouverture du contact mobile 12 du disjoncteur 1 différente de celle du contact mobile 22 du sectionneur 2,
• d'autre part, une course totale du contact mobile 12 du disjoncteur 1 dans un rapport différent par rapport à celle du contact mobile 22 du sectionneur 2.

It is quite possible, in the context of the invention, to modify, according to the first embodiment, the outer profile P and / or the inner profiles P1, P2 of the cams or, according to the second embodiment, the dimensions of the rhombus and its arrangement with the driving rod, coupling means and means for varying the shape of the diamond to obtain:

• on the one hand, a total duration of opening of the movable contact 12 of the circuit breaker 1 different from that of the movable contact 22 of the disconnector 2,
• on the other hand, a total stroke of the movable contact 12 of the circuit breaker 1 in a different ratio to that of the movable contact 22 of the disconnector 2.

According to the second embodiment and according to the variant of securing bars, the bar 131 shown is integral with the shaft 13 and the bar 90 'is secured to the connecting rod 90. It is quite possible, in the of the invention, to have the bar 131 and the shaft 13 made in the same room. Similarly, it is quite possible to have the bar 90 'and the connecting rod 90 also made in the same room.

According to the two embodiments illustrated, the invention makes it possible to have drive means common to a circuit breaker 1 and a disconnector 2 arranged at 90 ° to each other in the same switching device. According to the invention, the arrangement of the drive means common to the intersection of the axis of translation of the contacts and within the same metal shell 3 makes it possible to maintain compact dimensions for the switching device.

It is also quite conceivable, in the context of the invention, to provide an arrangement of the disconnector with respect to the circuit breaker at an angle different from 90 ° from one with respect to the other, the common drive means remaining arranged at the intersection of the translation axes of the contacts and within a same metal shell.

Claims (18)

Switching apparatus (A) comprising a circuit breaker (1) and a disconnector (2) arranged in a plane and fixed to a metal casing (3), the circuit breaker (1) and the disconnector (2) each comprising a pair of contacts ( 11,12; 21,22) comprising a fixed contact (11; 21) and a movable contact (12; 22) in translation so as to separate each other upon switching, the apparatus (A) further comprising means drive (4, 8, 80, 81, 82, 9, 90) common to the circuit breaker (1) and the disconnector (2) comprising: a single insulating driving rod (4) adapted to have a translation movement in the same plane as that of translation of the movable contacts (12; 22), a mechanical assembly (80, 80 ', 80'',80''', 9, 90) mounted in the metal casing (3) and at least part of which is driven by the single insulating drive rod ( 4) allowing the non-simultaneous translation of the two movable contacts (12; 22). Switching apparatus (A) according to claim 1, wherein the mechanical assembly comprises: at least one cam (80,80 ', 80'',80''') rotatably mounted in the metal casing (3), the cam (s) (80,80 ', 80''), 80 ''') having an outer profile (P) and / or inner profiles (P1, P2) allowing non-simultaneous translation of the two movable contacts (12; 22) resting against or in the cam (s) (80,80 ', 80'',80'''), - return means (14, 24, 83) housed in the metal casing (3) and adapted to hold each of the two movable contacts (12, 22) in abutment against the external profile and / or in the internal profiles of the (es) cam (s) (80,80 ', 80'',80''') regardless of its (their) rotational position. Switching apparatus (A) according to claim 2, wherein the outer profile (P) and / or the inner profiles (P1, P2) of the cam (s) allows (at) both the opening of the contacts (11,12) of the circuit-breaker (1) before that of the contacts (21,22) of the disconnector (2) and the closing of the contacts (21,22) of the disconnector (2) before that of the contacts (11,12) of the circuit breaker (1). A switching apparatus (A) according to claim 2 or 3, wherein the cam (80,80 ', 80' ', 80' '') is connected to the drive rod (4) via a rod (82) of curved shape for circumventing the axis of rotation (81) of the cam. Switching device (A) according to any one of claims 2 to 4, wherein at least one movable contact (12,22) comprises a shaft (13,23) provided with a shoulder at its end housed in the envelope metallic (3), means of recall comprising at least one compression spring (14,24) coaxial with the shaft (13,23) and bearing against the shoulder and against a part of the metal casing separating it from the disconnector (2) or circuit breaker (1) and through which the shaft (13,23) passes. Switching device (A) according to any one of claims 2 to 4, wherein at least one movable contact (12) comprises a shaft (13) provided at its end with a fork (16) housed in the metal casing , the return means comprising at least one pin (83) fixed internally to one of the branches of the fork (16) and housed in a groove (P1, P2) formed at the inner periphery of the cam (80 '). A switching apparatus (A) according to any one of claims 2 to 6, wherein a single cam (80) is rotatably mounted in the metal casing (3) and is driven by the drive rod (4). Switching device (A) according to any one of claims 2 to 6, wherein three cams (80 '', 80 '''), two of which (80''') have the same outer profile are rotatably mounted in the metal casing (3) on the same axis (81) and a single cam is driven by the drive rod, at least one movable contact (22) having a shaft (23) provided at its end with a fork (230) housed in the metal casing (3) and each of the branches bears against one of the two cams (80 ") to the same outer profile. A switching apparatus (A) according to any one of claims 2 to 8, wherein the outer profile (P) of the cam (80,80 '', 80 '' ') comprises two continuous curves, such as when both movable contacts (12,22) are supported jointly on one of the two curves, only the movable contact (12) of circuit breaker (1) has a translation movement and when the cam has reached a given rotational position one (22) of the two movable contacts bears on the other of the two curves. Switching apparatus (A) according to claim 9, wherein, when the cam has reached a rotational position greater than 90 ° with respect to the initial position in which the two contacts (11,12; 21,22) are closed, the movable contact (12) of the circuit-breaker (1) bears on one of the curves while the movable contact (22) of the disconnector (2) bears against the other of the curves. Switching device (A) according to any one of claims 2 to 10, wherein at least one movable contact (12) is constituted by a shaft (13) at the end of which is mounted a roller (15) so as to have a rolling bearing against the outer profile (P) of the cam (80). Switching apparatus (A) according to claim 1, wherein the mechanical drive unit comprises: - Four links (92, 93, 94, 95) of frozen length articulated together forming a rhombus (9), one of the vertices (9i) of the diamond being secured to the movable contact (12) of the circuit breaker (1); - A drive rod (90) having one end (902) integral with the insulating rod drive (4) and another end (901) integral with the top of the opposite rhombus (9j) to that integral with the movable contact circuit breaker , - coupling means (98, 900; 98 ', 99', 990 ', 99'') between the movable contact (22) of the disconnector (2) and the connecting rod (90), means (91, 96, 97, 960, 970) for varying the shape of the diamond (9) in the plane of the circuit-breaker (1) and of the disconnector (2) during its driving by the rod (4); the diamond, the drive rod, the coupling means and the diamond shape variation means being arranged between them to allow non-simultaneous translation of the apex (9i) of the rhombus integral with the movable contact (12) of the circuit breaker and the movable contact (22) of the disconnector coupled to the connecting rod (90). Switching device (A) according to claim 12, wherein the coupling means comprise a groove (900) integral with the connecting rod (90) and having a non-rectilinear profile, a roller (98) integral with the movable contact (22). of the disconnector (2) and mounted in the groove (900) of the rod, the groove being arranged to allow the sliding of the roller in the groove over the entire stroke of the drive rod but its translation on only a part of this race. Switching device according to claim 13, in which, to allow both the opening of the contacts (11,12) of the circuit breaker (1) before that of the contacts (21,22) of the disconnector (2) and the closing of the contacts (21,22) of the disconnector (2) before that of the contacts (11,12) of the circuit breaker (1), the articulated diamond and the connecting rod are arranged between them such that: - On a first translational stroke of the drive rod, the diamond (9) moves in the direction of the drive rod keeping an identical shape and the coupling roller (98) slides in the groove of coupling (900) without translation of the movable contact of the disconnector and, - On a second translational race of the continuous drive rod in the first race, the apex (9i) of the rhombus (9) integral with the movable contact (12) of the circuit breaker remains stationary, while its shape varies and the roller of coupling (98) slides in the coupling groove (900) with translation of the movable contact (22) of the disconnector. Switching apparatus (A) according to claim 12, wherein the coupling means comprises: an axis (98 ') fixed to the connecting rod (90), - a coupling lever (99 ') rotatably mounted in the metal casing comprising a lumen (990') having a non-rectilinear profile in which the axis attached to the connecting rod is mounted, - a coupling rod (99 '') articulated between the coupling lever (99 ') and the movable contact (22) of the disconnector; the shaft, the coupling lever and the coupling rod being arranged between them to allow the axis (98 ') to slide in the lumen (990') over the entire driving stroke of the shaft but the pivoting of the lever (99 ') on only a part of this race. Switching device (A) according to one of claims 12 to 15, wherein a roller is mounted on the shaft (98 ') fixed to the connecting rod (90) to have a bearing coupling. Switching apparatus (A) according to any one of claims 12 to 16, wherein the means for varying the shape of the diamond comprises: - Two non-rectilinear guide grooves (960, 970) each comprising a first straight portion (960d, 970d) and a second straight portion (960di, 970di) in continuity with the first straight portion, the grooves being arranged between them such that the first straight portions (960d, 970d) are parallel to each other and the second straight portions (960di, 970di) converge towards one another, - Two guide rollers (96, 97) each secured to another vertex (9k, 91) of the rhombus (9) itself not secured to the movable contacts (12, 22) of the circuit breaker and the switch and adapted to be mounted each in one of the two non-rectilinear guide grooves (960, 970), the rhombus and the guide grooves being arranged between them such that: On the first translation stroke of the drive rod, the guide rollers (96, 97) each slide in the first straight portions (960d, 970d) of the guide grooves while maintaining the identical shape of the rhombus, On the second travel of the continuous drive shaft in the first stroke, the guide rollers (96, 97) each slide in the second straight portions (960d, 970d) of the guide grooves (960, 970) in thus varying the shape of the diamond. Switching apparatus (A) according to one of claims 12 to 16, wherein the means for varying the shape of the diamond (9) comprises: a wall (31) fixed inside the metal casing (3), - A hollow bar (131), one end (1310) is integral with the movable contact (12) of the circuit breaker and the other end (1311) is provided at its periphery with holes (1312) opening in which are mounted balls ( 1313) and is shaped to be surrounded by the fixed wall (31), - A bar (90 ') one end (900') is integral with the drive rod (90) and the other end (901 ') comprises cavities (9010') forming spherical caps and is of suitable shape to be nested partially in the hollow bar (131), - Two guide grooves (rectilinear arranged between them converging towards one another; - Two guide rollers each secured to another vertex of the rhombus itself not secured to the movable contacts of the circuit breaker and the switch and adapted to be each mounted in one of the two guide grooves, the rhombus, the fixed wall (31) , the bars (131, 90 ') and the guide grooves being arranged between them such that: On the first translational stroke of the drive rod, the bars (131, 90 ') are integral with each other by the lateral locking of the balls (1313) on the one hand, by the fixed wall (31) and on the other hand; on the other hand, by the spherical caps (9010 '), the shape of the diamond (9) thus being maintained, At the beginning of the second translational stroke of the continuous drive rod in the first stroke, the bars (131, 90 ') are disengaged from one another by the lateral unlocking of the balls (1313) on the side ( 310) of the fixed wall (31), on the end of the second race, the guide rollers each slide in the rectilinear and convergent guide grooves thus varying the shape of the rhombus (9).

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