EP1004737B1 - Lifting device for a sash of a door, window or the like - Google Patents

Abstract

The lifting device comprises a lever pivoted on a support plate and able to engage a support stop on the frame. The lever is subjected to a resilient return means (20,21) to cause its tipping into a waiting position in the direction of the stop once the door opens. The resilient return means push back the lever in either one direction (22) or another (23) relative to the support plate. Retractable retaining means (20,21) prevent tipping of the lever so that the elimination or retraction of one of the retaining means causes the tipping of the lever in a specified direction.

Description

The invention relates to a lifting device comprising a lever pivotally mounted on a support plate attached in rebate on the opening frame or the standing frame of a door, window or the like, and adapted to cooperate with a bearing stop arranged in correspondence, as the case may be, on the sleeping frame or said opening frame, to ensure grip load, at least in part, of the weight of the latter at the time of close said door, window or other, said lever being subjected to the impulse of elastic return means ensuring its tilting in a waiting position in direction of the support stop, once the door or window opened.

The present invention will find its application in the field of the building hardware and concerns everything in particular, the devices making it possible to resume, partially, the weight of a door leaf when closing this one on its sleeping frame. The invention also relates to anti-tampering devices capable of preventing a locking fitting, of the bolt type or lever-bolt type can be brought into its locked position as long as the opening of a door, window or the like, has not been closed on its sleeping frame.

In fact, we will refer, in particular, to document EP-A-0.735.223 where there has already been described a device for linkage corresponding to the description above.

Thus, this device is in the form of a lever mounted tilting at its upper end on a support plate reported in rebate of the front upright of the opening door, window or the like. Elastic return means act on this lever to push it into abutment in a waiting position towards the sleeping frame. All particularly, in rebate of the corresponding amount of this the latter is a support stop on which can, precisely, take support of the lower end of the lever, this at the time of closing the door, window or other, for, by rotation effect around its pivot axis on the chassis opening, ensuring the lifting of the latter and guaranteeing its engagement, in a suitable position in the frame.

In the specific case described in this document EP-A-0.735.223, the lever has, at its lower end, a kind of side cut to define a finger positioning intended to favor engagement with the stop of support on the sleeping frame. Of course, the configuration of this support stop is adapted to that of said lever.

In particular, if this support stop is symmetrical configuration, with respect to its median plane horizontal, to allow adaptation to a door or window opening on the right as on the left, the part of the device linkage reported on the opening frame, namely the lever or still its support plate, does not have this faculty. it is to say that the manufacturer must manage the manufacture of lifting devices for an application, on the one hand, to right and, on the other hand, left. Furthermore, the carpenter must also have both types of lifting devices to be able to meet the demand of its customers, not to mention that he must ensure when equipping a carpentry that it receives the right device lift.

Furthermore, insofar as, from the outset, the means of elastic return push the lever back into its position waiting, either offset, angularly, relative to the axis longitudinal of the support plate, the storage of these lifting devices are problematic. In addition, once mounted on a joinery their lever defines a projecting part by compared to the chassis plan which makes it particularly vulnerable until the door is mounted on its frame sleeping.

As revealed in document EP-0.735.223, such lifting device can also constitute a device anti-tampering device capable of preventing a fitting from locking can be brought into its locking position as long as the opening of a door or window is not closed on its sleeping frame. However, such a conception generates other disadvantages.

In particular, it is necessarily in this position natural waiting, imposed by the means of recall elastic, which the lever ensures, through its axis of pivoting through the support plate, locking in translation of an operating rod corresponding to a locking bolt of the lever type or lever-bolt. Through therefore, when coming to equip the opening chassis with a carpentry of such a lever or lever-bolt, the operation of the latter can only be tested condition for the operator to return the lever to the extension of the support plate, against the action of the means elastic return. We understand, of course, that this complicates this test maneuver for the operator.

We still know, from document EP-0.515.931, a fitting for tilt-and-turn window using a linkage acting in the lower rabbet between the sash and the frame. This lifting device includes a rising lever pivoting on a support plate reported in rebate on the opening frame, as well as a support stop which is fixed on the frame.

The lever can be hinged on said support plate by means of an eccentric allowing to adjust its position and, therefore, its action relative to the support stop. Furthermore, stop means are provided to limit the angle pivoting of the lever relative to said support plate.

In this regard, this lifting device also includes elastic return means in the form of a pin spring intended to push the lever back into a waiting position in direction of the support stop. For this, one of the branches of the pin cooperates with retaining means at the level of said support plate, while the other branch, under stress, acts on a support lug that includes the lever.

In a particular embodiment allowing the use of this lifting device, both on a right-hinged leaf that on the left, under the influence of the elastic return means the lever is defined to even tilt, in one or the other direction relative to the support plate. In this case, this lever has on its side opposite the support plate two support pins intended to cooperate with one or the other branches of the pin spring mounted at said level platinum. More specifically, by tilting the lever around its axis, it can be folded into a waiting position on one side or the other of the support plate, one or the other of its support lugs then taking support on one or the other branches of the spring. Thus, by closing the opening on the sleeping frame resulting in folding the lever in the extension of the support plate, this lug pushes back the corresponding branch of the hairpin spring, putting this one under duress. Thus, after reopening the opening, this branch of the spring is able to push back again this lever in the correct waiting position.

As already mentioned in connection with document EP-0.735.223, once mounted on a joinery the lever defines, in all the cases, a protruding part relative to the plane of the chassis this which makes it particularly vulnerable as long as the opening is not not mounted on its sleeping frame.

Ultimately, the present invention proposes to remedy to the aforementioned drawbacks through a single lift capable of equipping, indifferently, a door or opening window on the right or on the left. In particular, the sense of momentum communicated to the lever through elastic return means can be freely chosen by the carpenter in a final frame assembly operation opening on its sleeping frame, or even, only after installation of the door or window in its frame at a level building.

des moyens de retenue sécables et/ou escamotables prévus aptes à empêcher le basculement du levier, respectivement, dans l'une et l'autre des directions de pivotement de sorte que la suppression et/ou l'escamotage de l'un desdits moyens de retenue provoque le basculement du levier dans une direction déterminée,

ou des moyens d'attache au niveau de la platine support comportant au moins un point d'attache intermédiaire avec lequel est déterminé à même de coopérer l'une des extrémités des moyens de rappel élastiques pour entraíner la neutralisation de l'action de ces derniers sur le levier et maintenir celui-ci dans le prolongement de ladite platine support.

To this end, the invention relates to a lifting device comprising a lever pivotally mounted on a support plate attached in rebate on the opening frame or the sleeping frame of a door, window or the like, and provided capable of cooperating with a stopper d 'support provided in correspondence, as the case may be, on the sleeping frame or the opening frame to ensure support, at least in part, for the weight of the latter when closing said door, window or other, said lever being subjected upon the impulse of elastic return means ensuring its tilting in a waiting position, in the direction of the support stop, once the door or window is open, characterized in that said elastic return means are defined capable of pushing said lever, as the case may be, in an opposite direction or direction with respect to said support plate, while it comprises, in combination, as the case may be:

breakable and / or retractable retaining means provided capable of preventing the lever from tilting, respectively, in one and the other of the pivoting directions so that the removal and / or the retraction of one of said means of retained causes the lever to tilt in a specific direction,

or attachment means at the support plate comprising at least one intermediate attachment point with which is determined to cooperate one of the ends of the elastic return means to cause the neutralization of the action of the latter on the lever and hold it in line with said support plate.

Ultimately, it was imagined elastic return means which, initially, either exert on the lever of contrary efforts coming to be canceled either, conversely, do not exert any impulse on the lever. Only in phase final assembly and lock assembly on a carpentry that the operator will be able to constrain the means of elastic reminder to exert their action in one direction or in the other on the lever, either by canceling one of the efforts applied by these elastic return means to this lever, or by coming to constrain them in a defined direction.

Also, the advantages which result from the present invention are multiple. In particular, since it no longer exists only one type of lifting device this facilitates their manufacturing management, but also that of their storage, advantage found both at the level of the manufacturer and carpenter. In addition, the lever being maintained, in a first time, in the extension of its support plate, this set is not only less bulky, but also less vulnerable.

Finally, such a lifting device, even if it is assigned the function of anti-misuse device, allows, during the mounting of a locking fitting on a opening, testing the proper functioning of this fitting locking without it being necessary, in parallel, to activate the device to authorize this maneuver.

It will be observed that, according to another characteristic of the present invention, the lever of this lifting device can be equipped with means for adjusting its length which allows to facilitate, considerably, the initial adjustments and later.

Other objects and advantages of the present invention will become apparent during the following description relating to different embodiments.

• la figure 1 est une représentation schématisée d'une fenêtre équipée d'un dispositif de relevage conforme à l'invention ;
• la figure 2 est une représentation schématisée et en élévation d'un dispositif de relevage conforme à un premier mode de réalisation.
• la figure 3 est une représentation schématisée et en élévation d'un dispositif de relevage conçu selon un second mode de réalisation ;
• la figure 4 est une représentation schématisée et en coupe partielle selon IV-IV de la figure 3 ;
• la figure 5 est une représentation en élévation d'un dispositif de relevage conforme à un troisième mode de réalisation, le levier étant, ici, maintenu dans le plan médian longitudinal de sa platine support ;
• la figure 6 est une représentation schématisée et en élévation du dispositif de relevage correspondant à la figure 5, le levier étant maintenu, à présent, dans sa position d'attente sous l'impulsion des moyens de rappel élastiques ;
• la figure 7 est une représentation schématisée et en coupe selon VII-VII de la figure 5 ;
• les figures 8, 10 et 12 correspondent à des représentations schématisées des moyens venant remplir la fonction d'anti-fausse manoeuvre associés au dispositif de relevage illustré sous différentes formes de réalisations dans les figures 2 à 7;
• les figures 9, 11, et 13 correspondent à des représentations schématisées et en coupe respectivement des figures 8, 10 et 12.

Understanding of this description will be facilitated by referring to the attached drawings, in which:

• Figure 1 is a schematic representation of a window equipped with a lifting device according to the invention;
• Figure 2 is a schematic representation in elevation of a lifting device according to a first embodiment.
• Figure 3 is a schematic representation in elevation of a lifting device designed according to a second embodiment;
• Figure 4 is a schematic representation in partial section on IV-IV of Figure 3;
• Figure 5 is an elevational representation of a lifting device according to a third embodiment, the lever being, here, maintained in the longitudinal median plane of its support plate;
• Figure 6 is a schematic representation in elevation of the lifting device corresponding to Figure 5, the lever being maintained, now in its waiting position under the impulse of the elastic return means;
• Figure 7 is a schematic representation in section along VII-VII of Figure 5;
• Figures 8, 10 and 12 correspond to schematic representations of the means fulfilling the function of anti-false maneuver associated with the lifting device illustrated in different embodiments in Figures 2 to 7;
• FIGS. 9, 11, and 13 correspond to schematic representations and in section respectively of FIGS. 8, 10 and 12.

The present invention relates to a lifting device 1 applied, as shown in Figure 1 of the accompanying drawings, to a door, window or the like.

In particular, this lifting device 1 comprises a lever 3 pivotally mounted on an attached support plate 4, as shown in Figure 1 in rabbet 5 of the front upright 6 of the opening frame 7 corresponding to this door or window 2. A in this connection, this support plate 4 can be fixed on a headrest present in rabbet 5. The lever 3 is all particularly intended to cooperate with a support stop 8 which is provided in rebate 9 of the corresponding amount 10 of the frame 11.

We will already observe that a reverse arrangement is possible, that is to say that the opening frame 7 can receiving the support stop 8, the sleeping frame 11 being equipped, under these conditions, lever 3. However, for better understanding of the description which will follow will relate, more particularly, to the first solution exposed.

Thus, the lever 3 is still subject to the impulse of means of elastic return 12 that the support plate 4 comprises, this to cause it to tilt into a waiting position that we see very particularly shown in Figures 1 and 6 of the attached drawings, when the door or window 2 is open.

Thus, in this standby position the lever 3, of which the upper end 13 is pivotally mounted ,. using articulation means 14 around a horizontal axis 15 and parallel to the plane of the opening frame 7, points its end lower 16 towards the frame 11.

Also, when closing this opening frame 7 on said frame 11 this lower end 16 of the lever 3 first meets the support stop 8. At this time and in continuing the movement the opening frame 7 is raised, under the effect of the double rotation of this lever 3, on the one hand, by relative to the articulation means 14 which connect it to the support plate 4 and, on the other hand, from its fulcrum, to its lower end 16, on the support stop 8. This chassis opening 7 can then be integrated, suitably, into a frame sleeping 11.

Advantageously, the lever 3 comprises means 17 allowing to adjust its length. Substantially, these means 17 consist, at its lower end 16, in a part telescopic end 18 adapted to be immobilized in a position determined relative to lever 3 via clamping means 19.

In fact, the peculiarity of the invention resides in that, in as part of a first embodiment corresponding to the Figure 2, the elastic return means 12 are defined suitable pushing said lever 3, as the case may be, in a direction or in the opposite direction with respect to the support plate 4 on which it is rotatably mounted. In addition, said platinum support 4 comprises two breakable retaining means 20 and 21 and / or retractable provided capable of preventing the tilting of the lever 3, respectively in either direction of pivoting 22, 23 so that the removal and / or the retraction of one of said retaining means 20, 21 causes the tilting of this lever 3 in a determined direction, respectively 22, 23.

Thus, as can be seen in this FIG. 2, said means of elastic reminder 12 can be in the form of a hairpin spring 24 whose two arms 25, 26 are kept under stress between two lugs of retainers 27, 28 defining the two breakable retaining means 20, 21 and / or retractable, insofar as it suffices to cut one of these retaining pins 27, 28 or to pass one branches 25, 26 above one of them so that this branch 25 or 26 of the spring 24, coming to rest, then, on a hooking finger, as the case may be, 29, 30 associated with lever 3 push it back in direction 22 or reverse 23.

Note that this still works in the case where the pins breakable and / or retractable 27, 28 are associated with lever 3, the support plate 4 then receiving the hooking fingers 29, 30.

Note the presence of stop means 31 capable of limiting the pivot angle of the lever 3 relative to the plate support 4 whether by rotating clockwise or trigonometric.

According to another conception of the present invention, visible Figures 3 and 4, the support plate 4 comprises means attachment 40 with which one is able to cooperate one 41 of ends 41, 42 of a spiral or helical spring 43 corresponding to the elastic return means 12, the other of which end 42 acts, precisely, on lever 3.

In fact, these attachment means 40 comprise at least two attachment points 44, 45 which are thus determined on the support plate 4 that by coming to connect said end 41 of the spring 43 with one or other of these attachment points 44, 45 this results in the stressing of said spring 43 having as a consequence of causing lever 3 to tilt in direction 22, respectively, in the opposite direction 23.

In the end, bringing the branch 41 of the spring 43 in cooperation with the attachment point 44 or with the attachment point 45, this results in the stressing of this spring 43 one way or the other so the action of its branch 42 on the lever 3 is not the same.

There are, of course, again, stop means 31 able to limit the angular displacement of this lever 3 by in relation to the support plate 4.

Advantageously and as visible in FIG. 3, these means attachment point 40 also have an attachment point intermediate 46 whose position is determined so that the cooperation of the end 41 of the spring 43 with this point of intermediate attachment 46 comes to neutralize the action of this spring 43 on lever 3. This is then held in the extension of the support plate 4. It is in fact in this configuration that device 1 is delivered to the carpenter, to him to tension the spring 43 so that it acts in the correct direction on lever 3.

Its design according to Figures 5 to 6 corresponds to the case of figure where the elastic return means 12 are under in the form of a pin spring 24A provided with two branches 25A, 26A kept slightly under stress between two elements forming a stop 27A, 28A associated with the support plate 4, while that the lever 3 receives hooking means able to cooperate with one or other of the branches 25A, 26A of the spring 24A in view of the lever 3 tilting in one direction 22 or in the opposite direction 23. Substantially, the means attachment consists of two attachment fingers 29A, 30A, associated with lever 3 on its side 32 opposite the plate support 4.

Thus, initially, these two attachment fingers 29A, 30A are arranged between the branches 25A, 26A, of the spring 24A ensuring the maintenance of the lever 3 in the extension of its support plate 4.

Then, coming to ensure the crossing of one of the fingers attachment 29A disposed on one side of the lever 3, with respect to the branch 25A being located on the same side, this branch 25A in cooperation with this latching finger 29A prevents this lever 3 to return to its original position. In fact, the spring 24A the then keeps in its waiting position.

It will be observed, in particular, that these attachment fingers 29A, 30A are defined in the form of a step, i.e. once one or other of the branches 25A, 26A crossed the maneuver reverse is impossible because of the steps that define, precisely, these hooking fingers 27A, 28A in this position.

It is obvious that the hooking fingers 29A, 30A can be associated with the support plate 4, the lever 3 receiving, then, the elements forming a stop 27A, 28A now slightly stressed the two branches 25A, 26A of spring 24A.

A lifting device 1, according to the invention can, advantageously fulfill the functions of an anti-forgery device operation as part of its application to a fitting locking mechanism of the cremone bolt or cremone bolt type.

In fact, such a bolt or bolt-lock comprises, usually a control mechanism on which the user acts via a handle or a control button, if necessary, again, using a key element. The movement thus ensured by this user is then passed on to one or more operating rods extending above and / or below said housing in order to actuate organs locking devices, such as rollers, bits and the like.

In the context of an application to tilt-and-turn windows, such a locking fitting, of the lever type or cremone bolt, still allows, starting from the position of door or window lock, select mode opening, or oscillating around an axis of vertical rotation, or tilting by rotation of the sash, relative to the frame, around a horizontal axis materialized by the lower cross member of this opening.

In this context, an anti-false maneuver device has for function to prevent the locking fitting from being operated when the door or window is in one any of these opening positions, as long as the opening not folded back against the sleeping frame.

On this, it should also be clarified that such cremones or locks are frequently housed in a groove built-in rebate of the opening frame and closed with a headrest at the back of which move the above-mentioned operating rod or rods.

In this case, said anti-false operation device 50 is defined on the one hand by lever 3 and, on the other hand, by a pivot shaft 51 defining, substantially, the articulation means 14 of this lever 3. This shaft of pivoting 51 is extended through an opening, a part, in the support plate 4 and, secondly, in the headrest 52 to which the latter is attached. To his free end, said pivot shaft 51 carries a retaining tab 53 which is engaged in a light 54 arranged accordingly in the operating rod 56 coming to move behind the headrest 52.

The assembly is thus designed so that once the chassis opening 7 folded down on its sleeping frame 11 and, therefore, the lever 3 brought back in the longitudinal plane of the support plate 4, the retaining tab 53 is in the axis of the light 54 in the operating rod 56, authorizing the free displacement of the latter. Unlike after opening of the door or window and the lever 3 pushed back into its position waiting by means of elastic return means 12, this retaining tab 53 is positioned at an angle in the lumen 54 so as to cooperate with recesses lateral 57, 58 at the latter. Said trigger of maneuver 56 is then immobilized in translation.

It should be observed that this light 54 in the rod of maneuver 56 can thus include several recesses lateral 57, 58 for immobilizing this rod operation 56 in different positions corresponding to different possibilities of opening the door or window.

In this field locking fittings of the bolt type or cremone bolt, it is still customary to ensure immobility temporary operating rods to facilitate correct positioning in relation to each other, of the different parts making up a bolt or bolt-lock when mount it on a carpentry. Such immobilization maneuvering rods is still desirable when there is place to cross them to adjust them to this carpentry. he it is important, in fact, that this cross-checking takes place while taking account of the locking or unlocking position that occupy, at this time there, these rods of operation. For we use breakable immobilization pads connecting, for example, an operating rod to its headrest, this pad being automatically sectioned during the first control of the cremone bolt or cremone bolt mechanism.

In fact we imagined to associate with the lifting device 1 according to the invention, this immobilizing function temporary of a cremone rod or cremone bolt. In particular, the retaining tab 53 corresponding to the anti-misuse device 50 is provided capable of receiving a breakable stud 59 defining on at least one of the lateral sides 60 of the retaining tab 53, a boss 61 able to cooperate with one of the recesses lateral 57, 58 in the lumen 54 of the operating rod 56 to immobilize it for the necessary time. In particular, when ordering on the move this operating rod 56 under the impulse of the control of the cremone bolt or cremone bolt one of the shoulders 62 defined by such an offset 57, 58 comes to act, like a chisel, to cut the boss (s) 61 of the breakable stud 59, thus releasing said operating rod 56.

As is apparent from the above description, the present invention advantageously responds to disadvantages resulting from the state of the art.

Claims (8)

1. Lifting device including a lever (3) pivotally mounted on a support plate (4) inserted against the fillister on the sash (7) or the sash-frame of a door, window or the like (2), and designed capable of co-operating with a resting stop (8) correspondingly provided for, as the case may be, on the sash-frame or the sash (7), in order to ensure the taking up, at least partially, of the weight of the latter when closing said door, window or the like (2), said lever (3) being subjected to the impulse of elastic restoring means (12) ensuring its tilting into a waiting position, in the direction of the resting stop (8), once the door or window (2) is open, characterised in that said elastic restoring means (12) are defined capable of pushing back said lever (3), as the case may be, in a direction (22) or an opposite direction (23) with respect to said support plate (4), while it comprises, in combination, as the case may be :

   shearable and/or retractable retaining means (20, 21 ; 29A, 30A) designed capable of preventing the tilting of the lever (3) in either one of the directions of pivoting (22, 23), respectively, so that the suppression and/or the retraction of one of said retaining means (20, 21; 29A, 30A) causes the lever (3) to tilt in a determined direction,

   or fixing means (40) at the level of the support plate (4) including at least an intermediate fixing point (46), which one (42) of the ends of the elastic restoring means (12) is capable of co-operating with, in order to cause the action of the latter on the lever (3) to be neutralised and to maintain the latter in the extension of said support plate (4).
2. Lifting device according to claim 1, characterised in that the elastic restoring means (12) are in the form of a pin-shaped spring (24) comprising two legs (25, 26) maintained under stress between two retaining pins (27, 28) defining the two shearable and/or retractable retaining means (20, 21).
3. Lifting device according to claim 2, characterised in that the two shearable and/or retractable retaining pins (27, 28) are associated with the support plate (4) or the lever (3), the latter or said support plate (4) receiving two coupling catches (29, 30) with one of which co-operates one of the legs (25, 26) of the spring (24), once one of the retaining pins (27) or (28) has been sheared and/or retracted.
4. Lifting device according to claim 1, characterised in that the fixing means (40) are also defined by at least two fixing points (44, 45) so determined on the support plate (4) that bringing said end (41) of the elastic restoring means (12) into cooperation with one or the other, respectively, of these fixing points (44, 45) results into their putting under stress, which results into causing the lever (3) to tilt in a direction (22) or in an opposite direction (23), respectively.
5. Lifting device according to claim 4, characterised in that the elastic restoring means (12) are defined by a spiral or helical spring (43).
6. Lifting device according to claim 1, characterised in that the elastic restoring means (12) are in the form of a pin-shaped spring (24A) provided with two legs (25A, 26A) maintained slightly under stress between two elements (26A, 27A) forming a stop and associated with the support plate (4) or the lever (3), the two retractable retaining means (29A, 30A) being defined by two coupling catches the lever (3) includes or, as the case may be, the support plate (4) capable of being positioned between the two legs (25A, 26A) of the spring (24A) in order to ensure maintaining the lever (3) in the extension of the support plate (4) and, on the other hand, either of which is capable of co-operating with either one of the legs (25A, 26A), respectively, of the spring (24A) in order to ensure the tilting of the lever (3) in a direction (22) or in the opposite direction (23).
7. Lifting device according to any of claims 1 to 6, characterised in that it defines a device impeding an accidental operation (50) capable of preventing the displacement of an operating rod (56) of a locking fitting, such as an espagnolette or espagnolette-lock, associated with the sash (7) of a door, window or the like, this as long as said sash (7) is not closed against its sash-frame, said device impeding an accidental operation (50) being defined, on the one hand, by the lever (3) and, on the other hand, by a shaft of pivoting (51) defining, substantially, the hinging means (14) of this lever (3), this shaft of pivoting (51) being extended through an opening, on the one hand, in the support plate (4) and, on the other hand, in a face-plate (52) against which the latter is inserted, the free end of said shaft of pivoting (51) including a retaining tongue (53) maintained inserted in a slot (54) accordingly provided for in an operating rod (56) moving behind said face-plate (52), at the level of this slot (54) being provided for side setbacks (57, 58) which said retaining tongue (53) is capable of co-operating with in order to immobilise in translation the operating rod (56) when the sash (7) is in any of its opening positions with respect to the sash-frame.
8. Lifting device according to claim 7, characterised in that it includes means for temporarily immobilising an operating rod of an espagnolette or espagnolette-lock, said means being in the form of a shearable stud (59) defining, on at least one of the lateral sides (60) of the retaining tongue (53), a boss (60) capable of co-operating with one of the side setbacks (57, 58) in the slot (54) of the operating rod (56) in order to temporarily immobilise the latter.

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