FR2842645A1 - SWITCH PROVIDED WITH A TRIGGER DEVICE - Google Patents

Abstract

The contact holder 10 of an electrical switching device is connected to a bistable sub-assembly 22 cooperating with an accumulation spring 20 by means of a disengageable transmission kinematic chain 54, which makes it possible to open the apparatus quickly and with low energy without having to move the bistable sub-assembly 22 from the stable closed position to the stable open position. Once the kinematic chain 54 has been disengaged, the accumulation spring 20 and / or an additional spring 88 drive the contact carrier 10 towards the separation position. The system includes a release latch 82 releasing the spring used in the release sequence, the movement of the spring making it possible to unlock a release latch 80 of the disengageable kinematic chain.

Description

SWITCH PROVIDED WITH A TRIGGER DEVICE

TECHNICAL FIELD OF THE INVENTION

  The invention relates to a switch for low power voltage, provided with a trigger mechanism.

STATE OF THE PRIOR ART

  100021 In FIG. 1 is schematically represented a conventional power low-voltage switch mechanism, in the open position. A bistable sub-assembly 200, composed of a lever 202 and a connecting rod 204 articulated by an axis 206, is biased by an accumulation spring 207 between a stable opening position limited by an opening stop 208 and a stable closing position limited by a closing stop 209, passing through an unstable neutral position in which the spring 207 is loaded to the maximum. The lever 202 drives a contact bridge 210 with knives 212 between a contact position and a separation position, by means of a connecting rod 214. In the contact position, the knives 212 of the contact bridge 210 are deeply inserted into contact clamps 215 connected to connection pads of the switch. Whatever the electrodynamic force applied to the contact bridge 210 and tending to open, the closed position remains stable since the closing stop 209 prevents any movement of the bistable sub-assembly 200. The connecting rod 214 is provided with an oblong 216 , so that when the contact bridge 210 is in the contact position and the mechanism in the closed position, it is possible, without moving the contact bridge, to bring the lever 202 using a handle 218 from the closed position to beyond the neutral position. In this way, we loaded the spring before the separation of the contacts and we take advantage of all the energy accumulated to suddenly open the device. Conversely, when the contacts are in the separation position and the mechanism in the open position, it is possible to maneuver the lever 202 from the open position to beyond the neutral position without moving the bridge contact, and thus to charge the accumulation spring which becomes motor for the whole closing stroke. Such a device combines simplicity and power, the latter characteristic being necessary for operating contacts of the knife and pliers type. It is therefore particularly suitable for power switches, having a very high electrodynamic resistance, that is to say a strong ability to remain closed and passing during the passage of very high permanent currents, greater than 15 times the nominal current, being recalled that the electric current induced between the contacts of a device for breaking the

  electromagnetic forces which tend to separate the contacts from each other.

  Unfortunately, these devices do not lend themselves to rapid maneuvering and require significant energy upon opening since, in order to open the device, it is necessary to pass the neutral point of the bistable subassembly 200, therefore recharging the accumulation spring. 208. If one wishes to operate such a device from a distance, this energy required for opening is particularly disadvantageous because it requires very expensive and bulky means of

handle motorization.

3] Mechanisms are also known which allow rapid opening. These are typically the circuit breaker mechanisms, a schematic diagram of which has been shown in FIG. 2. Such a mechanism comprises an upper connecting rod 220 and a lower connecting rod 222 forming a toggle joint 224 connecting a hook 226 to a contact carrier bar 228 The hook 226 pivots about a fixed axis 227 and is retained by a lock 230 in a locked position. A handle 232 pivoting around a fixed geometric axis 234 is connected to the axis 236 of articulation of the toggle joint 224 by means of an accumulation spring 238. When the hook is in the locking position, it is possible to open and close the switchgear by tilting the handle which drives the contact carrier via the toggle switch 224 which unfolds and folds. When it is necessary to separate the contacts without maneuvering the handle, in particular in the event of a short circuit or electrical fault, the lock 230 is actuated which releases the hook. The residual charge of the accumulation spring 238 in the closed position is then sufficient to drive the contact carrier 228 in the separation position, the mechanism then being in a triggered position. Such a mechanism meets the need for a quick remote opening operation without motorization. However, it is not suitable for a device requiring significant mechanical energy when closing, because by unfolding and folding, the toggle 224 never passes on either side of its neutral point corresponding to the alignment of the axes of the upper connecting rod 220 and the lower connecting rod 222. In the closed position shown in FIG. 2, equilibrium is obtained by the residual tension of the accumulation spring, which also dictates the contact pressure. The closed position is not absolutely stable in the direction o, by applying sufficient force to the contact holder to open the contacts, the toggle switch 224 can be folded back. To increase the electrodynamic resistance, the spring must therefore be reinforced. accumulation and consequently all parts of the mechanism which are subject to greater deformation and wear. Consequently, this type of construction is largely unsuitable for devices requiring high electrodynamic resistance.

STATEMENT OF THE INVENTION

4] The invention therefore aims to remedy the drawbacks of the state of the art, so as to provide an electrical switchgear ensuring the passage of a very high permanent current, while allowing a quick opening operation and little

  energy, suitable for example for remote control.

5] To this end, the invention relates to a mechanism for an electrical switchgear, comprising: - a support; - a contact carrier movable relative to the support between a contact position and a separation position; - a bistable sub-assembly cooperating with an energy storage spring so that the bistable sub-assembly oscillates between an open position and a closed position, passing through an intermediate neutral position, the spring accumulating charging when the bistable sub-assembly approaches the neutral position and discharging when the bistable sub-assembly moves away from the neutral position; - a kinematic chain of disengageable transmission movable between a engaged state and a disengaged state, the kinematic chain of disengageable transmission in the engaged state ensuring a transmission of movement between the bistable subassembly and the movable contact carrier, so that when -bistable assembly is in the open position, the movable contact carrier is in the separation position and when the bistable sub-assembly passes into the closed position, the movable contact carrier passes into the contact position, the driveline transmission disengageable in its disengaged state making

  the mobile contact holder independent of the bistable sub-assembly.

  The use of a bistable sub-assembly ensures the irreversibility of the closed position, therefore the guarantee of great electrodynamic resistance. The possibility of disengaging the disengageable transmission chain frees the contact carrier and makes it independent of the bistable sub-assembly by nature too slow to allow

  fast and low energy maneuver.

7] Preferably, the mechanism further comprises means for driving the movable contact carrier from the contact position to the separation position when the disengageable transmission kinematic chain is in the disengaged state. The means used

  can be of all types, motorized or not.

  According to a very advantageous embodiment, the means for driving the contact carrier comprise a kinematic chain of trigger transmission, arranged between the storage spring and the contact carrier, so that when the kinematic chain of disengageable transmission is in the engaged state, the trip transmission kinematic chain does not transmit the movement of the movable contact carrier between the contact position and the separation position to the storage spring and that, when the disengageable transmission kinematic chain passes from the In the engaged state in the disengaged state, the accumulation spring discharges by driving the movable contact carrier from the contact position to the separation position via the kinematic chain of trigger transmission. The storage spring which opens and closes via the bistable sub-assembly is also used to

opening by declutching.

  Advantageously, the means for driving the movable contact carrier further comprise an additional spring. According to a first variant, the accumulation spring and the additional spring together open by disengaging. In this case, the additional spring only accumulates additional energy so that the accumulation spring does not have to supply all of the rapid opening energy. According to a second variant, the additional spring alone provides all the energy necessary to separate the contacts during disengagement, which avoids the establishment of a kinematic chain of trigger transmission between the accumulation spring and the contact holder. Advantageously, the mechanism further comprises a disengaging lock locking the drivetrain of the disengageable transmission in the engaged state. During unlocking, the disengageable transmission chain can be brought into the disengaged state by various means: return spring, ramp, etc. Advantageously, the mechanism further comprises an opening lock

  locking the means for driving the movable contact carrier.

2] Preferably, the two locks coexist and the opening lock also locks the disengaging lock, so that a single order can control

the whole mechanism.

3] Preferably, the release lock is m by the means for driving the movable contact carrier. The energy of the means for driving the movable contact carrier when the disengageable drive kinematic chain is in the disengaged state is therefore used, in order to operate the declutching lock, for example the energy of the spring

  accumulation or additional spring, as applicable.

4] According to a particularly simple and clever embodiment, the mechanism further comprises: - a hook movable relative to the support between an attached position and an off-hook position, the bistable sub-assembly comprising an upper element kinematically linked to the hook and a lower element articulated on the upper toggle element via a hinge pin, the bistable sub-assembly being movable between the open position and the closed position when the hook is in the hooked position, the spring accumulation being disposed between the hook and the hinge pin and tending to drive the hook towards the off-hook position, the kinematic chain of trigger transmission being disposed between the hook and the holder

6 2842645

  movable contact, so that when passing from the hooked position to the off-hook position, the hook drives the movable contact carrier from the contact position to the separation position, by means of the kinematic chain for triggering transmission; - A movable lock between a locking position and an unlocking position, the lock in the locking position retaining the hook in the hooked position; and possibly - a kinematic connection between the hook and / or the lock on the one hand and the disengageable transmission kinematic chain on the other hand, so that when the lock moves from the locking position to the unlocking position by releasing the hook, the hook and / or the latch move the disengageable drive train from the engaged state to the disengaged state, before the hook drives the movable contact carrier from the position of

  contact at the separation position.

5] The positioning of the spring between the joint and the hook makes it possible to use the two ends of the spring as a movable driving part. In the closing and opening phases by the bistable sub-assembly, it is the end of the spring on the articulation side which applies the mechanical work. In the triggering phases, the end of the hook side spring becomes mobile. The chronology obtained when triggered

  allows reliable control initiated by a lock.

  According to a preferred embodiment, particularly suitable for devices with very high electrodynamic resistance, the contact holder supports at least one first contact cooperating with a second contact and forming with the second contact a pair of clamp and knife contacts. In this case, the first contact can be secured to the contact holder. Alternatively, it is also possible to provide a contact connected to the contact holder by a contact pressure spring, in applications for which the holding

  electrodynamics is less essential.

BRIEF DESCRIPTION OF THE FIGURES

  Other advantages and characteristics will emerge more clearly from the description

  which will follow particular embodiments of the invention, given by way of nonlimiting examples, and shown in the appended drawings in which: - Figure 1 schematically shows a power switch of known type, in a position d 'opening; - Figure 2 shows schematically a low voltage circuit breaker of known type, in a closed position; - Figures 3 to 6 show an apparatus according to a first embodiment of the invention, respectively in an open-armed state, in a closed state, in an intermediate state at the start of triggering and in a triggered state; - Figures 7 to 10 show an apparatus according to a second embodiment of the invention respectively in an open-armed state, in a closed state, in a

  intermediate state at the start of triggering and in a triggered state.

  DETAILED DESCRIPTION OF AN EMBODIMENT

  Referring to Figures 3 to 6, a low power voltage switch comprises a contact bridge 10 movable in rotation about an axis 12 and provided with two movable contacts 14, cooperating with fixed connection contacts 16 connected to switch connection areas. The contacts 14, 16 are of the knife and pliers type. The contact bridge 10 is driven by a mechanism driven by an accumulation spring 20. A chassis 21 supporting the mechanism and shown purely schematically in the figures, defines a fixed geometric reference. The geometric axis 12 of rotation of the bridge

  contact is fixed in this repository.

  The mechanism comprises a bistable sub-assembly 22 formed by a connecting rod 24 articulated on a bistable lever 26 at an axis 28. The connecting rod 24 forms an oblong 30 in which slides a slide 32 secured to a hook 34 of control of the mechanism and extended by a projecting free end 36. The accumulation spring 20 is a compression spring, one end of which cooperates with the connecting rod 24 near the articulation 28 and the other end of which bears on the hook 34. The stroke of the articulation 28 is limited on one side by a fixed closing stop 38 and on the other by a fixed opening stop 42. The articulation 38 also cooperates with an arm

  of the control hook 34, in a plane different from that where the stop 42 is located.

  A slide 44 secured to the lever 26 is guided in a slot 46 secured to a handle 48 for operating the mechanism. The slot 46 forms a link with limited clearance on one side by a stop 50 and on the other by the end edge of the slot, a return spring 52 tending to move the bistable lever 26 away from the stop 50. handle 48 and

  the bistable lever 26 pivot around the same fixed geometric axis 53.

1] The bistable sub-assembly 22 is connected to the contact bridge 10 via a disengageable sub-assembly 54 composed of a connecting rod 56, an upper bar 58 and a lower bar 60. The bar upper 58 is a lever pivoting around a fixed geometric axis 62, linked to the bistable lever 26 by means of the connecting rod 56 and provided with an end projection 64. The lower bar 60 has a groove 66 cooperating with the projection 64 of the upper bar 58 to form a disengageable coupling 68. The connection between the lower bar 60 and the contact bridge 10 is produced by an oblong guide light 70 cooperating with a slide 72 integral with the contact bridge 10 and

  authorizing a travel of the contact bridge 10 relative to the lower bar 60.

2] The hook 34 pivots around a geometrical axis 74 fixed relative to the chassis of the device and its free end is provided with a roller 76 locked in position by a cam 78 held integral with a main lock 80 of the mechanism , itself locked by a control lock 82. The main lock pivots about a fixed geometric axis 83 and is returned by a return spring 84 clockwise in the figures. The main lock 80 cooperates with the lower bar 60 by means of an oblong guide 86. A trigger bar 88 connects the hook 34 to the contact bridge 10, by means of a slide 89 guided in an oblong guide 90. The control lock 82 is itself controlled by an electromechanical relay 92 and provided with an extension 94 cooperating with the free end 36 of the connecting rod 24 of the bistable sub-assembly 22. A leaf spring 96 secured to the handle 48 is arranged so as to be

  find on the trajectory of the hook 34.

  An optional additional spring 98 is disposed at the hook 34, to

  urge hook 34 to the disarmed position.

  The device operates in the following manner.

  In the position shown in Figure 3, the apparatus is in an undesirable armed open state. The articulation 28 is in abutment against the opening stop 42. The hook 34 held by the articulation 28 is in the armed position, and locked by the main lock 80. The additional spring 98, if it exists, is loaded. The storage spring 20 is partially charged. The connecting rod 24 of the bistable subassembly maintains by its free end 36 the control lock 82 in the locked position so that this position would not be affected if an opening order was transmitted to the electromechanical relay 92. The main lock 80 is therefore itself locked in the locked position and acts on the lower bar 60 so as to maintain the disengageable sub-assembly 54 in a engaged state, the projection 64 of the upper bar 58 being engaged with the groove 66 of the lower bar 60. The handle 48 is in the open position, and the

  slide 44 held by the return spring 52 against the edge of the slot.

6] We pass from the position of Figure 3 to the position of Figure 4 by operating the handle 48 to its closed position, clockwise in the figures. To do this, it is first necessary to bring the bistable sub-assembly 22 to an intermediate closed dead center position by charging the accumulation spring 20 but without driving the contact bridge 10, because of the dead travel determined by the oblong guide 70 of the lower bar 60. The control lock 82 is released by the end 36 of the connecting rod 24 shortly before passing neutral, but remains in position as long as no order is given. is transmitted by the electromechanical relay 92. It is only once the unstable dead center is exceeded and the accumulation spring 24 has become motor, that the slider 72 comes into abutment at the end of the light 70, so that the lower bar 60 starts to drive the contact bridge 10 towards the contact position. The movable knife contacts 14 penetrate the clamps 16 and while the kinematic transmission chain continues its movement under the impulse of the accumulation spring 20, until the articulation 28 meets the closing stop 38. During during the closing phase, the trigger bar does not intervene 1. - st! t3r3 due to the oblong 90 which leaves sufficient clearance. The potential energy of the accumulation spring 20 is therefore entirely devoted to closing the contacts. It is also noted that in the closed position the slide 89 has not reached the end of the oblong guide 90. It is useful to emphasize here that the contacts with pliers 16 and knives 14 admit a range of positioning of the knives relative to to the pliers. In this way, the clearances, tolerances and wear of the parts of the mechanism, which tend to change over time and from one device to another the position of the knives 14 in the clamps 16 when the mechanism is in the closed position. defined by the closing stop, have no consequence on the quality of the contact obtained. The closing stop has therefore

  no need to be positioned with very high precision.

  To move from the closed position of Figure 4 to the open position of Figure 3, simply act on the handle 48 so as to bring the bistable sub-assembly 22 to the neutral position by loading the accumulation spring 20 and move the neutral in the direction of opening. As long as the neutral point has not passed, the contact bridge

  10 remains stationary due to the dead travel to be covered at the oblong guide 70.

  Once the neutral point has passed, the accumulation spring 20 partially discharges in

  driving the contact bridge 10 to the open position.

8] Starting from the closed position of FIG. 4, it is also possible to cause a quick remote-controlled opening of the device to bring it into the position shown

  in FIG. 6, passing through the fugitive intermediate position shown in FIG. 5.

  To do this, it suffices to power the electromechanical relay 92 to cause the pivoting of the control lock 82 which releases the main lock 80. The hook 34 is then released and, driven by the accumulation spring 20 helped if necessary by the additional spring 98, it pivots slightly anticlockwise, which is made possible by the clearance existing between the contact bridge 10 and the trigger bar 88 at the light 90. The roller 76 climbs the ramp of the cam 78 and causes the main lock 80 to pivot in an anti-clockwise direction. The main lock 80 then drives the lower bar 60 so that the projection 64 of the upper bar 58 emerges from the groove 66 of the lower bar 60, thereby causing the disengageable subassembly 54 to pass into a disengaged state. We are at this moment 11 in the fleeting position of FIG. 5. The hook 34, urged by the accumulation spring 20, then becomes free to drive the contact bridge 10 via the trigger rod 88 , up to the separation position shown in FIG. 6. When reaching this position, the hook 34 interferes with the leaf spring 96 so that the handle 48 is pushed back until it is stopped by the stop 50, in a position indicating the triggered open state of the device. The handle 48 is thus used

  as a device for viewing the status of the device.

  To return the switch from the position of Figure 6 to the position of Figure 3, it suffices to maneuver the handle 48 to the open position. Initially, the handle 48 only drives the bistable sub-assembly 22 and the upper bar 58 by charging the accumulation spring 20. The bistable sub-assembly 22 reaches a neutral position of rearming when the spring accumulation 20 is aligned with the pivot axis 53 of the bistable lever 26, but this position is different from the closing dead center position encountered in the closing phase since the slider 32 of the hook which defines the articulation of the connecting rod 24 has changed position. Once the neutral point has been exceeded, the accumulation spring 20 becomes motor, but the articulation 28 almost immediately meets the arm 40 of the hook 34, so that the accumulation spring 20 practically does not discharge. When the movement of the handle 48 is continued to the open position, the handle drives both the bistable sub-assembly 22 and the hook 34. The hook 34 pivots towards its armed position, if necessary recharges the additional spring 98 , and releases the main lock 80. The main lock 80, under the action of its return spring 84, pivots clockwise and drives the lower bar 60 so that the projection 64 of the upper bar 58 enters the groove 66 of the lower bar, bringing the disengageable sub-assembly 54 back into the engaged state. At the end of the stroke, the end 36 of the connecting rod 24 comes into contact with the

  control lock 82 and returns it to the locked position.

  The mechanism according to the second embodiment of the invention, shown in Figure 7 in the open armed position, is similar to that of the first embodiment, so that the same reference signs have been taken to designate of the

  identical or similar elements.

1] With reference to FIG. 7, the bistable sub-assembly 22 of the second mode of

  embodiment comprises a telescopic upper link 24 articulated on a fixed point 32.

  As in the first embodiment, an extension 36 of the connecting rod 24 cooperates with the control lock 82. In this configuration, the accumulation spring 20 is no longer able to drive the trigger bar 88, and the additional spring 98 becomes essential to drive the contact bridge 10 via the trigger bar 88 during the trigger sequence. The additional spring 98 has been shown in the form of a compression spring which tends to return the trigger bar 88 to the right in FIG. 7. The bar 88 is movable in translation and provided with a reset range 100 and of a coupling cam 102. The reset range 100 cooperates with a reset lever 104 pivoting about a fixed axis 106 and articulated on the handle. The coupling cam 102 interacts with the lower bar 60 to bring the groove 66 in engagement with the projection 64 of the

upper bar 58.

2] The lower bar 60 is articulated on the contact bridge 10 via a light connection 70 and slide 72. A spring 110 cooperates with the lower bar 60 in the closed position and tends to pivot the lower bar 60 clockwise, out of engagement with the upper bar 58. The fixed contacts 16

  are contact clamps and the movable contacts 14 of the contact bridge are knives.

  The device according to the second embodiment operates in the following manner. Starting from the open armed position shown in FIG. 7, the apparatus is closed by maneuvering the handle 48 clockwise, to arrive in the position represented in FIG. 8. The bistable sub-assembly 22 passes the closing dead center beyond which the accumulation spring 20 becomes a motor and drives the contact bridge 10 in the contact position via the bistable lever 26, the connecting rod 56, the upper bar 58 and the lower bar 60. The opening by the

  handle 48 is performed in the opposite direction.

4] In the closed position, in FIG. 8, the lower bar 60 remains in engagement with the cam 102 so that the upper bar 58 remains integral with the lower bar 60. Furthermore, the reset lever 104 has pivoted and has totally freed from 100 scope.

  trigger bar 88 is held in position by the control lock 82.

  _ 7 -.- t1 ......,,: '-'. . = J -r. '.-. S, _ The connecting oblong 90 between the trigger bar 88 and the contact bridge 10 ensures play between the two parts. The end 36 of the connecting rod 24 has released the control lock 82. To quickly or remotely open the mechanism, it suffices to operate the control lock 82 to unlock the trigger bar. The additional spring 98 then drives the trigger bar 88 to the right. Initially, the bar covers the overtravel allowed by the oblong light 90. This first movement makes it possible to release the lower bar 60 from the cam 102 which plays there the role of a disengaging lock, as can be seen in the figure 9. As soon as the lower bar 60 is no longer in engagement with the cam, the spring 110 rotates it which has the effect of disengaging the groove 66 from the projection 64, and releases the lower bar 60. The movement of the bar trigger 88 can continue unhindered to the triggered position of Figure 10. A spring not shown can also be disposed between the trigger bar 88 and the handle 48 to return the handle to the position

  open intermediate triggered.

6] To return the device to the armed open position, it suffices to maneuver the handle 48 towards the open position, anticlockwise. The handle 48 acts on the bistable sub-assembly 22 to bring it back to the position of FIG. 7. The handle 48 also acts on the trigger bar 88 via the reset lever 104 and the bearing 100, and returns the trigger bar 88 to the armed position. This movement of the trigger bar 88 drives the lower bar 60 to the coupling position, via the cam 102. Finally, the bent end part 36 of the upper telescopic connecting rod 24

  returns the control lock 82 to the locked position.

  Naturally, various modifications are possible.

8] The geometric axis of rotation 12 of the contact bridge is not necessarily fixed.

  It can be a real axis or an imaginary axis. The switch must be a single break, that is to say only have a fixed contact and a movable contact. In a way

  generally, the movement of the movable contact (s) is not necessarily a rotation.

  % 2 _ f- ([00391 The lock can be controlled by any suitable electromechanical or mechanical means. It can in particular be controlled mechanically by a push button opposite

  front of the device which can replace or add to relay 92.

0] The bistable sub-assembly may consist of connecting rods, telescopic or not and / or levers or any other means ensuring two stable extreme positions and an intermediate unstable neutral position corresponding to a maximum of energy

  potential accumulated in the accumulation spring.

1] A reduction can be provided between the handle and the bistable lever. The

  handle can alternatively cooperate with the connecting rod of the bistable sub-assembly.

2] The handle can be replaced by a motorized mechanism.

3] The contact bridge can consist of a pair of pliers and the fixed contacts by knives. The knife and pliers contacts can be replaced by any equivalent type of contact, allowing the movable contact to have a range of positions ensuring

  contact with the fixed contact with a satisfactory contact pressure.

4] One can also consider using a movable contact connected to the contact carrier by a contact pressure spring, although this solution is less efficient in terms of electrodynamic behavior. In such a case, it can be envisaged to use compensated contacts from an electrodynamic point of view, that is to say shaped so that the forces induced by the electric current on the mobile part attract the contact. moving towards the fixed contact. Such contacts, described for example in the

  document FR 1.225.685 are well known to those skilled in the art.

2842645

Claims (8)

  1 - Mechanism for an electrical switchgear, comprising: - a support (21); - a contact carrier (10) movable relative to the support (21) between a contact position and a separation position; - a bistable sub-assembly (22) cooperating with an energy storage spring (20) so that the bistable sub-assembly (22) oscillates between an open position and a closed position, passing through an intermediate neutral position, the storage spring (20) charging when the bistable sub-assembly (22) approaches the neutral position and discharging when the bistable sub-assembly (22) moves away from the neutral position; characterized in that it further comprises: - a disengageable drive kinematic chain (54) movable between a engaged state and a disengaged state, the disengageable drive kinematic chain (54) in the engaged state ensuring movement transmission between the bistable sub-assembly (22) and the movable contact carrier (10), so that when the bistable sub-assembly (22) is in the open position, the movable contact carrier (10) is in the separation position and that when the bistable subassembly (22) passes into the closed position, the movable contact carrier (10) passes into the contact position, the drivable transmission kinematic chain (54) in its disengaged state making the movable contact carrier (10)   independent of the bistable sub-assembly (22).   2 - Mechanism according to claim 1, characterized in that it further comprises means (88) for driving the movable contact carrier (10) from the contact position to the separation position when the drivetrain of the disengageable transmission (54 ) is in the disengaged state. -r - w ;; - w;:, - wu #, r jL-'j 16 2842645   3 - Mechanism according to claim 2, characterized in that the means for driving the contact carrier comprise a kinematic chain of trigger transmission (88), disposed between the storage spring (20) and the contact carrier, so that when the disengageable drive kinematic chain (54) is in the engaged state, the triggering drive kinematic chain (88) does not transmit the movement of the movable contact carrier (10) between the position to the accumulation spring (20) contact and the separation position and when the disengageable drive kinematic chain (54) changes from the engaged state to the disengaged state, the accumulation spring (20) is discharged by driving the movable contact carrier (10 ) from the contact position to the separation position via   the drive transmission kinematic chain (88).   4- Mechanism according to claim 2 or claim 3, characterized in that the means for driving the movable contact carrier (10) further comprises a spring additional (88).   - Mechanism according to any one of the preceding claims, characterized in that   that it further comprises a declutching lock (80, 102) locking the chain   disengageable transmission kinematics (54) in the engaged state.   6- Mechanism according to any one of claims 2 to 5, characterized in that it   further comprises an opening lock (82) locking the means for driving the mobile contact holder (10).   7- Mechanism according to any one of claims 2 to 4, characterized in that it   further comprises: - a disengaging lock (80, 102) locking the disengageable transmission kinematic chain (54) in the engaged state; an opening lock (82) locking the means for driving the door   movable contact (10) and the release lock (80, 102).   r - - '. wr-r m:' rr r, srr'r fl * '37rrZ .. 17 2842645   8 - Mechanism according to any one of claims 2 to 4, characterized in that the   disengaging lock is m by the means for driving the movable contact carrier (10). 9 - Mechanism according to claim 3, characterized in that it further comprises: - a hook (34) movable relative to the support between an attached position and an off-hook position, the bistable sub-assembly (22) comprising an upper element (24) kinematically linked to the hook (34) and a lower element (26) articulated on the upper toggle element via a hinge pin (28), the bistable sub-assembly (22) being movable between the open position and the closed position when the hook (34) is in the hooked position, the accumulation spring (20) being disposed between the hook (34) and the hinge pin (28) and tensioning driving the hook (34) to the off-hook position, the kinematic chain for triggering transmission (88) being arranged between the hook (34) and the movable contact carrier (10), in such a way as to pass from the hooked position in the off-hook position, the hook (34) e ndrives the movable contact carrier (10) from the contact position to the separation position, via the kinematic chain for trigger transmission (88); - a lock (80) movable between a locking position and an unlocking position, the lock (80) in the locking position retaining the hook (34) in the hooked position.   - Mechanism according to claim 9, characterized in that it further comprises: - a kinematic connection between the hook (34) and / or the latch (82) on the one hand and the disengageable transmission kinematic chain (54) d on the other hand, in such a way that when the latch (82) passes from the locking position to the unlocking position by releasing the hook (34), the hook (34) and / or the latch (82) cause the chain to pass disengageable transmission kinematics (54) from the engaged state to the disengaged state, before the hook (34) drives the door   movable contact (10) from the contact position to the separation position. - _._ Ie.; _. P- 18 2842645   11 - Mechanism according to any one of the preceding claims, characterized in that   that the contact carrier supports at least a first contact cooperating with a second contact and forming with the second contact a pair of clamp contacts and knives. "", 1