FI72834B - UTLOESARE FOER EN AUTOMATISK ELLER STYRD GRAENSKOPPLARAPPARAT. - Google Patents

Abstract

1. A tripping device for a switch apparatus having a local control member (2) and the opening of which is automatic when faults appear, comprising : - on the one hand, a first quick trip mechanism which holds in a first stable closure position (F) a transmission member (3) associated with the control member (2) and subjected to a resilient return force which urges it successively to a second stable tripped position (D) and to a third stable opening position (O) and which closes a control switch (50) of the apparatus solely for the closure position of this transmission member (3), - on the other hand, a second quick trip mechanism which is adapted, on the one hand, to trip the first mechanism for releasing the transmission member (3) and adapted, on the other hand, for cooperating with this latter in order to give it these stable tripped (D) and opening (O) positions, - this transmission member (3) being capable of communicating, for a fourth unstable resetting (R) position, resetting movements which are applied to the second mechanism and which are transmitted to resettable detector devices reacting sharply on the appearance of current overloads of different levels in a power circuit of the apparatus, which is closed and opened by an electromagnet (51) whose coil is in series with the control switch device in which the second quick trip mechanism comprises : - a trip lever (20) causing the first quick trip mechanism to be released which is held resiliently set by cooperation with a pawl (29) subjected to the action of sliders (43, 47) associated respectively with the detector devices (55, 56, 57) and which cooperates with a first surface (6) of the transmission member (3) to stop this latter in the tripper position (D) when cooperation of the pawl with the trip lever is interrupted by the action of at least one slide (43, 47), - a resetting lever (35) which is brought by the trip lever and in a given direction (M) adjacent a second surface (9) of the transmission member, when this latter reaches this tripped position (D) and which cooperates resiliently (27, 4) with this second surface for stopping this transmission member in the opening position (O), this second surface (9) of this transmission member being capable of communicating to this resetting lever and in the unstable resetting position (R) a movement in the reverse direction (N) which is transmitted on the one hand (25, 49) to the trip lever for re-establishing cooperation thereof with the pawl and, on the other hand (45, 46 respectively 41, 42) to the slides (47, 43) towards the resettable detector devices (55, 56, 57).

Description

1 72834

Trigger for automatic or controlled limit switch

The invention relates to a trigger for an automatic or controlled limit switch device comprising - on the one hand a first quick release mechanism which in the first stable closed position keeps the transfer part subjected to a resilient force which gradually forces it towards the second stable trigger position and towards the third stable a switch which controls the device exclusively in said closed position, and - on the one hand a second quick-release mechanism intended to, on the other hand, drive the first mechanism to release the transfer part and operate in vh-15 with the latter so as to obtain said second and third positions, and is intended, on the other hand, to transfer the reset functions to the resettable devices, whereby the reaction is fast when various current loads occur in the power circuit of the device.

Such a mechanism is particularly applicable to a contactor device comprising a local control section and in which automatic opening means responsive to the presence of a load of momentary overloads in the circuit, such as loads due to full or imminent short circuits, or due to overloads.

One device with the general structure described above is known from French Patent Application No. 81 20919, filed on November 9, 1981 in the name of the applicant. In this known device using moving parts, one and the same part of the second quick-release mechanism is used to unlock the first mechanism, to cooperate with the transfer part and to provide a reset of the device to be returned in the event of a fault.

According to the invention, there is first developed a device which performs the same functions as the 2 72834 device previously known in the art and in which the tripping and resetting operations are provided by different parts, enabling efficient disconnection between the actual mechanical reset functions and the second mechanism and the resettable device or devices. and between the functions required to return and release the first release mechanism; the object of a particular embodiment is to develop a device in which the friction is reduced in order to improve the sensitivity and speed of the internal operation and at the same time to reduce the sensitivity in relation to external disturbances; finally, within the scope of the application between the device and the remote return device, the invention relates to measures by which operations can be performed by means of a motor rotating in one direction during manual return in both directions.

According to the invention, the object is achieved because the second quick-release mechanism comprises: - a release lever which releases the first quick-release mechanism, which lever is kept resiliently tuned because it cooperates with a stop actuated by two sliders belonging to the respective detectors, and cooperating with the first surface of the transfer member to stop the latter in the triggered position "D" when the operation of the at least one slider interrupts the interaction between the stop and the trigger lever; - a return lever which is brought back by the release lever and in a certain direction close to the second surface of the transfer part when the latter enters this position and which cooperates resiliently with this second surface to stop this transfer part in the open position, whereby the second surface of this transfer part is intended to transmit to this reset lever in an unstable reset position a movement in the opposite direction, which movement is transferred to the trigger lever 35 on the one hand and to the co-operation between the detent and the detent on the other hand, and on the slides towards the resettable detectors.

Other features of the device and its structural modifications will become more apparent from the following description, in which five figures are associated, of which: Figure 1 shows a schematic view of a first device according to the invention; Fig. 2 shows a schematic view of a second embodiment 5 derived from the device 10 of Fig. 1 in the closed position; Figures 3a and 3c show the device of Figure 2 in the trip, open and return modes, respectively; Figures 4a and 4b show a practical embodiment in which the transfer part is formed by a rotating part and in which two states, one triggered and the other closed during reset, are shown, and in which the trigger lever and its detent are omitted for clarity; Fig. 5 shows a schematic view of the device of Fig. 2 connected to a detachable, remotely controlled sub-device 20 and intended to provide a device-forming reset thereto; and Fig. 6 shows a perspective view of a rotating part used in the device of Fig. 4.

Item 1 of Figure 1 shows parts of the housing 25 that includes the mechanism. By means of the manual control part 2, a movable transfer part 3 can be used, which is connected to a tension spring 4, which tends to move it in the direction L.

This movable part has a first edge 5 parallel to the L-direction, a first inclined support surface 6, 30 which is in the first plane 7, a first abutment edge or surface 8 parallel to the L-direction, and a second inclined support surface 9 which is at level 40.

This movable part, which can be in one of the four positions F, D, 0, R, is shown in solid lines in position F, 35 and only the support surfaces 6 and 9 are shown in broken lines in the other positions D and O and D, 0 and R, respectively.

The locking lever 10, which pivots about a first fixed pivot joint 11,72834, which is integral with the housing, is held in a rest position where it contacts the head 12 by the action of a torque C1 applied by the spring 13 in the direction P. This lever carries a movable pivot-5 a joint 14 around which a retractable bolt 15 pivots, the rest position of which is determined by its contact with the lever stop 16 under the action of the spring 17. The other end 18 of this bolt cooperates with the surface 6 to keep the movable part 3 in the position F in which the spring 4 is tuned. In addition, the other end of the locking lever 10 adjacent to the bolt has an extension or cam 19.

The pivotable release lever 20, which pivots about a fixed pivot joint 21, comprises a hammer 22 opposite the extension 19, a contact 23, a contact 24 and a contact-chain 25.

The tooth 26 is located at one end of the part 20 and is affected by a torque C4 applied by a spring 27 in the direction M. This release lever 20 has a tuned rest position in which the spring 27 is stretched when the tooth 26 contacts the cam 28, 20 of the release stop 29 which can pivot the housing around a fixed pivot joint 30 and having two arms 31 and 32; this release stop has a rest position given to it by a spring 34 and determined by the housing response 33.

The return lever 35, which pivots freely about the pivot joint 25 '(which may have the same axis as the pivot joint 21 or have a pivot joint on an adjacent parallel axis), has a first arm 36, a second arm 37 and a third arm 38 having a second end surface 39 is in the plane 40, which is shown by a broken line and on which the support surface 9 moves.

The second end 41 of the arm 36 is located at a certain clearance opposite the flange 42 belonging to the first slide 43, which moves in the housing, e.g. in a straight line in the E or G direction, and whose finger 44 is located opposite the stop 41 arm 41.

35 The end 45 of the arm 37 is also positioned with a clearance

Il.

5,72834 a hot end surface 46 belonging to a second slide 47 which moves in the housing, e.g. in a straight line in the H or J direction and whose finger 48 is opposite the arm 32 of the detent 29.

Finally, the surface 49 of the return lever 35 remote from the pivot joint 21 'is opposite the contact 25, so that co-operation can be formed at an angle between the return and release levers in the M or N direction.

Parts and pieces 13,10,15,3, belong to the first 10 quick release mechanisms and parts 20,27,29,34 and 35 belong to the second quick release mechanism.

Since the purpose of the device just described is to start or stop the contactor device either by automatic opening in the event of a fault or by intentional opening by an external, manual means and a local control part, the control switch 50 is connected in series with a coil 51 belonging to the contactor electromagnet. is housed in a housing and shown schematically at 54, and comprises, e.g., 20 fixed contacts 52 resting on the housing and a movable contact 53 connected thereto; in the example shown, the movable contact rests on the locking lever 10 and the switch 50 closes when the movable part 3 is in the position F, this locking lever is in the rest position against the stop 12 25; the slides 43 or 47 are moved sharply in the E or H direction by returnable overload detectors located in the housing and shown diagrammatically at 55.55 ', 56.56' and 57.57 so as to respond to the occurrence of excessive currents at 30 different levels; contactor 54 in load circuits 58; references 55 ', 56', 57 'may represent percussion, magnetic plates and bimetallic strips, respectively.

The operation of the device just described is as follows.

When the release stop 29 is moved in the S direction, 35 the sudden movements in the E or H direction of the second slider 43 or 47 cause the shock 26 of the release lever 20 to shake and the lever 20 to rotate in the M direction; during this sudden movement due to the release of the spring 27, the contact 24 contacts e.g. the abutment 8, so that the part 20 goes to the working position where the contact 23 is in the plane 7 and opposite the support surface 6; this same movement, due to the moment C4, causes the hammer 22 to strike the cam 19 and thus the locking lever 10 to move abruptly in the Q direction, which in turn causes a break in the mechanical contact between the support pin 10 and the head 18 of the bolt 15.

In this case, the released, movable part 3 in turn moves in the L-direction until the support surface 6 comes into contact with the contact 23. The movable part 3 then goes to a stable, so-called, trigger position D, where the switch 50 opens; this opening is due to the fact that the end 18 of the bolt 15, 5 'contacts the edge 5 when the pivot lever 10 has suddenly entered an operating position which separates it from the stop 12.

In this state, the contact 25 contacts the surface 49 of the return lever 20 35 and has moved the latter so that the surface 39 of the head is located close to the support surface 9 of the transfer part 3.

Control of the part 3 in the K direction to make the device operate, namely in state F, cannot result in the release lever 20 released from the stop 29 being in a position which prevents the locking lever 10 from returning to its rest position, which closes the switch 50 and sets the bolt 15 18 against the support surface 6.

On the other hand, the device can be intentionally set to a deep open "0" state by using the part 2 in the L direction, which first causes the release lever 20 to turn slightly in the N direction because the support surface 6 acts on the contact; this pivoting movement, which allows the contact 23 to detach from the abutment surface 6 and contact the surface 5, causes the contact action 9 35 to cooperate with the surface 39 of the return lever 35 arm 38 to provide a stable open "0" state resulting from 7 72834 balancing of opposing forces springs 27 and 4 and which are moved on the one hand by parts 27,20,25,49,35,38,39 and on the other hand by parts 4,3,9.

The reset of the triggers of the device after the automatic tripping 5 must lead, on the one hand, to the return of the transfer part to the F position and, on the other hand, to the devices 55, 56, 67, 43 and 47 being placed in a state corresponding to the absence of a fault. This return, which gives movements in the G and J directions to the slides 43,47 and which is transmitted by the means 10 shown schematically at 59,60,61, is the result of the co-operation of the support surface 9 (or edge 62 separating this surface from the support 8) and the return lever 35 between 39 heads.

This return takes place through the movement ai-15 of the transfer part 3, which is controlled by an external effect on the part 2 and in the L-direction from the D-position or the O-position towards the R-position; wherein the surface 9 pushes back the lever arm 38 and causes the portion 35 to pivot in the N direction and the lever 20 to pivot until the cam of the detent 29 can go behind the tooth 26, and the sliders 43,47 on the other hand move in the G and J directions of the arms 36 and 37, respectively. the effect of ends 41 and 45. The state R thus obtained is not stable due to the resistive, elastic effect which the levers 20 and 35 move from the spring 27 to the transfer part 3, so that when the external effect 25 ceases, this part 3 tends to return to the O position.

In the embodiment shown in Fig. 2, in which parts having the same functions as in the previous example have the same reference numerals, the two preceding pivot joints 21 * 21 ', the axes converging at 21 and the support surfaces 30' and 9 'are adjacent surface parts belonging to the same surface. The device is displayed in this closed state F.

The trigger lever 20 ', the surface 24' of which cooperates here with the stop 8 'of the housing 1, which facilitates the interpretation of the silicon-35 crossings, could also go to the operating position 8 72834 by touching the contact surface 8 "similar to the contact surface 8 in Fig. 1«

In the operating position of the release lever 20 ', the flange 23' of this lever meets either the contact surface 6 'or the edge 621, 5 separating it from the surface 5 to give a stable released position D to the transfer part 3 and thus to the local control part 2, cf. Figure 3a.

The pivoting locking lever 10 (see Fig. 2) has a contact lever 63 which engages the stop 64 of this lever under the action of a spring 65 so as to have a rest position. The second pin 66 of this contact lever can lift the movable contact 53 'to separate it from the fixed contact 52' belonging to the control switch 50 ', which has the same function as the previous switch 50.

The opening of this switch here results either from the turning of the lever 10 in the Q direction after the release lever has released it, or from the fact that either the turn 10 of the lever 10 is turned or not, the end 66 is forced back in the K direction by the effect T, which will be explained later.

The sudden opening of the switch 50 'is the result of either an immediate rotation transmitted by the release lever to the lever 10 or an immediate separation of the bolt 15,18 and the contact surface 6' when the local guide part 2 moves the transfer part 3 'towards the 25 O position.

In the first case, the spring 27 transmits a resisting torque 4 in the M direction to the lever 10 against the torque C1 transmitted by the spring 13 in the P direction.

In the second case, the external force transmitted by the parts 2 and 3 '30 is added to the force of the return spring 4, so that this first causes the retractable bolt 15 to turn in the Q direction against the torque C2 applied to it by the spring 17; when the torque C3, which is greater than the torque C1, moves to the lever 10 because the retractable bolt 35 has gone into an inclined position relative to the surface 6 ', the lever 72 rotates very rapidly in the Q direction, allowing the bolt 18 to slide along the edge 62' and settle against the contact surface 5 to keep the switch 501 open.

As in the case of Fig. 1, the positions D, 0 cause an opposing co-operation between the surfaces 6 ', 23 * and between the surfaces 9', 39 ', respectively, in order to give two stable positions to the transfer part and the local guide part, Figs. 3a and 3b. the arrows indicate this cooperation.

Here again, the unstable position R is obtained by a restoring force towards the Q position, which is transmitted to the transfer part 3 by a spring 27, the effect of which is transmitted by the release lever 20 ', its arm 25', surface 49, lever 35 'and end 39', the latter acting on the surface. 9 ', cf. ku-15 faults 3c, where opposite arrows indicate opposing effects.

In the two embodiments shown, the movements of the transfer part are assumed to be linear. The devices are designed to operate in the same way when these parts 3,3 'are 20 rotating parts, e.g. the same piece as the rotating knob 2 moving about an axis YY' perpendicular to the lateral movements K and L.

In the second embodiment shown, shown in Fig. 4a in the triggered state D, where the same reference numerals indicate similar functions, the collaring part 3 "having the same function as the part 3 'can move around the pivot joint 69, the axis of which is parallel to the parallel pivot joints. 11,67,14,21 and with 30 axes.

The contact lever 63 comprises a first end 66 ', the operation of which will be described later, and a second insulating end 69, which cooperates with the movable contact 53', as did the end 66 described above.

For structural reasons, the return lever 35 'shown by the broken line comprises, instead of the arms 41,45, contacts 72834 41', 45 'which have the same functions as the arms 41 and 45 for performing the return by cooperating with the respective surfaces 42 and 46.

The surfaces 6 'and 9' shown in Fig. 6 are aligned but axially displaced along a rotating transfer member 3 '', which further includes a cylindrical surface 8 "acting in contact with this member 3" in any position other than position 9 '. . The trigger lever 20 "has an arm 25" that cooperates with the return lever contact 10 49 ', which has the same function as the surface 49 described above. The characteristics and modes of operation of the transformations are substantially the same as the device shown in Figure 1.

Triggering mechanisms, such as those shown in Figures 2-6, are particularly well suited for remote control of receiver-15 racket external control functions; these are supplied, for example, by an electric actuator by means of a small synchronous motor to close the device in order to achieve a remote reset and start. The disconnections provided by these mechanisms between the reset and trip and close functions of the control switch, as well as the corresponding arrangements of the directions of movement of the parts performing these functions and the means fDO and R, allow remote control of the device incorporating this mechanism in a simple manner. to be reset remotely after automatic opening.

It should be noted that in the mechanisms described in connection with Figures 2,3,4 and 6, the movement in the K direction applied to the transfer member to move it to position F, the movement of the return lever arms 36 applied in operation during recovery, and the movement applied to the end 66 'of the contact arm 63 to keep the switch open are parallel and occur in the same direction.

Thus, it is possible to combine these mechanisms 35 (see Figure 5, in which, for clarity, the trigger 11 72834 lever and stop are not shown) with an internal remote control slide 70 having three parts 71,72,73 intended to apply pressures to the same in the direction (indicated by the arrows STV), e.g. to the surface part 74 of the transfer part 31, which would preferably be located in three levels 75 near the planes 7 and 40 on the head 66 'and the arm 36.

This slide 70, which is connected to the return spring 77 and the housing stop 76 to determine its rest position W, is displayed in the Z position in which it enters the moment when the transfer part 3 'is just engaged and held in place by the bolt 15,18. .

The lower device 78, which is removably attached to the housing 1 and comprises two supply hubs 79,80, over which are connected e.g. a small synchronous, one-way motor 81 and a holding switch 82, is provided with a pusher 83 operated by the motor via a reduction gear 85 with a large reduction 90 through. This push 83 penetrates the housing 1 through its opening 88 to co-operate with the sliding surface 87 of the slider 70 after passing through the opening 89 of the housing 1 20.

The switch 82, which is open only when the pusher 83 is in the rest position W, which closes as soon as the latter moves in the K direction, ensures continuity of power supply to the motor when a short starting voltage 25 disappears, which is connected directly to the motor via switch 91, which is between terminal 79 and third terminal 84; this voltage is switched on at the moment when a reset must be performed by remote control.

The pusher 83 connected to the spring 86 and 30, which once during each command performs one outward movement in the K-direction and a return movement in the L-direction between successive positions W, B.X.B, W, then transmits to the slide 70 the movements of the WX amplitude.

The rest position W of the slider, which corresponds to the rest position 35 of the pusher 70, is such that even with the return position R given to the transfer part 3 'by an external action manually on the local guide part 2, the support surface 74 cannot come into contact with the part 71; likewise, neither arm 36 12 72834 nor arm 66 can reach parts 73 and so on. 72 for the D position of the transfer part.

The first position X reached by the slide and obtained by the transfer part 3 'is such that the support surface 6' becomes 5 to the left of the bolt 18, so that this can be placed by the action of the spring 13.

In all positions of the slider 70 to the left of the B position, the part 72 meets the end 66 'of the contact lever and keeps the switch 50' open; if the return effort 10 transmitted to the return lever 35 'during the movement from W to X is effectively followed by the retention of the return lever by the stop 29 during the return movement from W to position B and through position Z, the lever 10 may be in the position shown in Figure 5, and the switch 50 'can again close only when the slider returns to the right from position B. But since the retainer 29 can in fact hold the return lever 20' if the quick release mechanism 57 (which itself reacts to the bimetallic strip 57 'which is heated or still warm) does not from the points to the movement of the slide 47 in the H-direction, this lever 20 'would cause the lever 10 to turn again before the point B is reached, if this slide 47 could not go to the position where it is towards the J position.

The results obtained during the remote control operation of the device just described are comparable to those obtained by the reset and shutdown operation manually applied to the local control section.

In one embodiment shown in Figure 4b using a similar transfer member 3 "as shown in Figure 6, a surface 74 'having the same function as surface 74 in Figure 5 may be aligned with surfaces 6' and 9 ', while it is moved sideways axially so that it does not interfere with surfaces 24 and 39 (see Figure 6).

It is preferable to use a slider, such as the slider 70 of the embodiment shown in Fig. 4a, because those parts or surfaces 35 66 ', 74' and 411 all located on the underside 72834 of the shaft 68 'move in the K direction at the time of the return ( see Figure 4b, where the state of the parts shown is comparable to Figure 5).

During these various reset operations, it must be possible for the 5 stops to engage behind the tooth only if the conditions or faults which caused the trip in position D have disappeared. Since the contactor is open and thus there is no current in the load circuit, the only condition that can prevent the detector from engaging is that which is the result of bending of the bimetallic strip 57 'which is further heated after prolonged overloading; in this case, the action caused by the overload detector 57, which moves permanently along the path 61 during the cooling of the bimetallic strip, prevents the slide 47 from remaining in the position directed towards the J-point 15 and thus prevents the stop from going to its rest position; hence the release lever 20 and resp. 20 ', 20 "cannot return to its tuned position when the transfer part exits the R position to go to successive positions O and F. Since this is impossible, the locking lever 10 20 cannot return to its rest position so that the switch 50 remains open even if part 3 is reset F thus, the load circuit 58 cannot be reset as long as the double metal strip is still warm.

If the fault that caused the contactor to open and thus place the transfer part in the D position is immediately the result of a complete short circuit or imminent short circuit (in which case the bimetallic strip does not have time to heat up), then the return movement from D to R allows the release lever 20 or 20 * to be set. to a tuned position in which the permanent operation 30 of the detectors, either the magnetic 55 or the thermal detector 56, does not move the paths 59 or the like. 60 along the corresponding slide 43 or 47.

Attempt to start the device by the movement of the transfer part from R to F thus causes the locking lever 10 to turn when this part reaches the F position, since the hammer 22 of the lever 20 is 14 72834 positioned away from the cam 19. If a short circuit still exists, then the closing of the control switch 50 or 50 ', which then allows the contactor 54 to be energized, causes the at least one detector 55 or 56 to be energized and thus the levers 20,20', 20 "and 10 to trip in turn and the switch 50 or 50 'to reopen , so that the voltage removal of the electromagnet 51 again opens the load circuit.

This operation takes place regardless of whether the external action 10 is manually held in the 3 or 3 'position of the transfer part or not.

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Claims (12)

1. Trigger for a switchgear having a local control part and which opens automatically when an error occurs, and extensive; - on the one hand, a first quick release mechanism which, in a first stable closing position, holds a transfer member in communication with the control member and subjected to a resilient return force which forces it subsequently to a second stable, released position and to a third stable opening position and which closes the control switch of the apparatus exclusively for the closing position of this transmission part, - on the other hand, a second quick release mechanism, which is intended on the one hand to trigger the first mechanism for releasing the transmission part and on the other side to cooperate with the latter to give it stable, triggered and opening positions - wherein this transfer part embodies a fourth unstable reset position to mediate reset motions applied to the second mechanism and transmitted to resettable detectors reacting suddenly to the occurrence of overcurrent at different levels in an open circuit of the device, electromagnet, whose winding is in series me d a control switch, characterized in that the second quick release mechanism comprises: - a trigger lever (20) which releases the first quick release mechanism which is sprung resiliently adjusted by cooperation with a latch (29) subjected to the impact of the herring (43,47). belonging to the corresponding detectors (55,56 57) and cooperating with a first wet (6) on the transmission part (3) to stop the latter in the released position D when the interaction between the latch and the trigger lever 30 is interrupted by the actuation of at least one slide. a restraining lever (35) which is moved by the trigger lever in a given direction M to a second surface (9) of the transfer member then the latter when this position D and which cooperates resiliently (27,4) with this second surface stopping this transfer part in the opening position 0, whereby this second surface (9) of the transfer part can convey to this restraint lever and in the unstable iter position position R a movement in the opposite direction N which is transmitted on one side (25, 49) to the release lever for to restore its cooperation with the latch and on the other side (45.56 and 41.42, respectively) to the slide (47.43) 5 against the resettable detectors (55,56,57). 2. A trigger according to claim 1, characterized in that the first quick release mechanism comprises a pivot lever (10) which is held in a rest position by a first torque (C1) produced by a first spring 10. (13), and which has a retractable pivot bolt (15) driven toward this pivot lever by a second spring (17) generating a second torque (C2), the pivot bolt (15,18) cooperating for this rest position with a surface (6) for holding the transfer member (3). and holding it later in a position F, or to release it immediately by either the presence of an internal immediate action transmitted by the trigger mechanism lever (20) of the second mechanism, during which only the first spring (13) is forced by the torque (C3). ) which counteracts the torque (C1), or by an external action (L), applied to the transfer member (3) and transmitted to the bolt and under which the second spring (17) is first forced by all of a torque counteracting the torque (C2) and pulls in this bolt and is transferred to the pivot lever (10) in the same direction (Q) as the torque (C3). Trigger according to claim 1, characterized in that the trigger lever (20) and the reset lever (35) are mounted for pivoting about the same pivot shaft (21), such that a torque (C4) generated by a spring (27) setting the trigger lever (20) is transmitted to the reset lever (35), and the stable opening position (O) of the transfer member is obtained when the torque (C4) counteracts an opposite torque mediated by this second abutment surface (9) under the action of a return spring (4). at the transfer part. Trigger according to claim 3, characterized in that the first and second surfaces (6 *, 9 ') are two adjacent portions of the same surface at right angles to the direction of movement of the transmission part (K, L) and positioned. on this transfer part (3 ') and respectively. (3 ") on two different levels (7.40). Trigger according to any of the claims 1 to 4, characterized in that the pivot lever (10) of the first quick release mechanism has a pivoting contact lever (63), which is opposed by a spring (65) and one end (66) thereof. is intended to open the control switch (50 ') either as this pivot lever is released or when this end is moved away from the pivot lever against the action of this spring (65) by an action (T) of outer bore (78) intended to effect restoration. 6. A trigger according to claim 5, characterized in that the transmission part (3 ') traveled. (3 ") has a third surface (74) and (74 '), respectively, designed to cooperate with an inner movable part (70) which can be moved by a drive part (78) located on the outside of the coupler (1) and which can transmit to this transfer part a movement from a position D to a position X which is more distant than the position F, whereby the bolt (15) can retain the first surface (6 '). Trigger according to claim 6, characterized in that this movable part (70) further cooperates with an arm (36) of the reset lever (35) and with one end (66) (66 ') of the contact lever (63) during the transfer part (3 ') (3 ") movement from D to X, to position the trigger lever (20) as well as the detectors (55,56,57) in a reset position and open control switch (50'), respectively, and a movement (XZB) in the opposite direction. to this part (70) is transmitted by the driver so that the coupler (50 ') is still open where the bolt (15) can cooperate with the first surface (6') in position F. Trigger according to claim 7, characterized in that the movable part (70) is a slide which moves substantially rectilinearly to slide.