EP2003274B1 - Device for securing a secure access of an emergency access to a public infrastructure - Google Patents

Abstract

The device (1) has an operating mechanism (40) actuated from the exterior of an infrastructure and supporting a rigid pushing piece (30) against a bolt (9) until the piece releases an opening frame e.g. vertical door, for opening an emergency access. A chassis (20) supports the mechanism. The mechanism has a lock insert (42) driven in rotation under the action of a key when the key is received in the insert. A cam (52) is kinematically connected in rotation to the insert and translationally drives the piece with respect to the chassis along a rectilinear translation direction (T).

Description

The present invention relates to a device for securing emergency access to a public infrastructure.

An example of such a device is provided by DE-U-20 2005 00 2908 , on which the preamble of claim 1 is based.

The invention applies in particular to infrastructure such as underground railway stations and galleries, including metro, but can be adapted to any type of site and configuration.

Such stations, which are frequented by a large number of passengers, must have a high level of security. In particular, rescue teams, such as fire brigade teams, must be able to reach strategic areas of the stations very quickly from the outside, that is to say generally from the surface. It is therefore common to provide that these rescue teams do not use public access stations, but specific emergency access.

Apart from an emergency intervention, that is to say in normal times, these emergency accesses are closed by openings, such as vertical doors or horizontal hatches, immobilized with respect to the wall or floor walls. delimiting the emergency accesses, by a bolt secured to the opening. To open the access, it is necessary to release the opening by releasing sufficiently the bolt vis-à-vis the wall or floor walls. In practice, this action on the bolt must be commanded from outside the access by the rescue teams, while being prohibited to unauthorized persons, in particular to malicious people who seek to fraudulently enter the stations, often for vandalism purposes. Under these conditions, it is known to arrange in the wall or floor wall which extends opposite the bolt a metal pusher finger intended to abut against the bolt to disengage it. This pusher finger is fixedly attached to one end of a movable plate whose opposite end fixedly bears a maneuvering square, that is to say a metal stud of square cross section, accessible from the outside, especially in a recess in the wall or ceiling wall. The rescue teams then use a removable bar for driving the plate, this bar delimiting an end imprint, complementary to the maneuvering square, so that when the fingerprint and the maneuvering square are in contact with each other. the other, the rotational drive of the bar causes the platinum to rotate around its end bearing the operating square. The pusher finger then describes a circular path, centered on the maneuvering square, until it comes to rest against and release the bolt to release the opening and thus open the emergency access. It will be understood that this plate makes it possible to secure the emergency access, in the sense that only persons having the drive imprint of the square are able to open the access.

However, the rudimentary form of this square maneuver makes the corresponding training fingerprint easy to copy, so that malicious people easily get enough tools to operate the platen. To solve this problem, it has been proposed to use a compression spring having a high stiffness, typically 80 DaN. This compression spring is interposed between the plate and a support frame of this plate, so that, in order to rotate the plate relative to the chassis, it is necessary to develop a significant effort. In practice, three people are needed: two people cooperate to apply sufficient torque on the actuating bar of the square to overcome the resistance of the spring, while a third person releases the opening once the bolt enough moved by the pusher finger. Rescue teams know the steps necessary to open the emergency access, but this device only dissuades imperfectly the malicious people. However, it is understood that these manipulations are tedious for rescue teams, especially when the plate is integrated into a wall wall because the maneuvering square is then accessible in a horizontal direction, which induces ergonomic constraints for the two people needed to overcome the resilience of the spring, these two people tend to embarrass themselves mutually. In addition, the resistance generated by the spring requires to arrange the support frame of the plate in a particularly strong wall or ceiling wall, otherwise the high stresses applied during the rotational drive of the plate may 'damage this wall.

The purpose of the present invention is to provide a device for securing an emergency access, which, while being dissuasive vis-à-vis malicious people, is faster and easier to operate by authorized persons, especially by rescue teams such as firefighting teams.
For this purpose, the subject of the invention is a device for making an emergency access to a public infrastructure, as defined in claim 1, secure.

One of the ideas underlying the invention is to deter malicious people not by providing a significant mechanical strength to overcome to operate the device, but by restricting the actuation capacity of the device with the lock cylinder, chosen to can only be solicited by a key specifically adapted to this barrel. The barrel of the device according to the invention is advantageously selected from the so-called high security barrels, that is to say of which barrels certified unclogable. In this way, it is extremely difficult for malicious people to rotate this barrel with picking tools, such as hooks, while authorized persons, including rescue teams such as firefighting teams, have of the key proper to this barrel. Advantageously, the barrel of the device according to the invention is provided interchangeably, typically during a maintenance intervention, in order to regularly change the internal profile of this barrel, intended to cooperate with a corresponding specific key, so as to limit the risk that after a certain time, keys obtained fraudulently from authorized persons are used in a malicious way.

In addition, the operation of the device according to the invention is based on the cam rotated by the barrel. This cam combines reliability and efficiency, in the sense that it is advantageously made of a metal, such as brass, ensuring a long life without problem of deformation and / or seizure. In addition, this cam makes it possible to urge the thrust piece of the bolt with a force in a rectilinear direction, which is particularly effective for moving the bolt, without the user having to develop a significant torque when it drives the cylinder in rotation by the associated key. Thus, a single operator is sufficient to release the bolt to release the opening and thus open the emergency access.

Furthermore, the fact of urging the thrust piece in a rectilinear translational movement offers the possibility of oversize this thrust piece in a plane perpendicular to the direction of translation, without impairing the reliability of the thrust action of the bolt. In this way, even if this thrust piece is not strictly centered in direct view of the bolt to push, the bolt is effectively constrained by at least a longitudinal portion of the thrust piece, so that the device according to the invention can be implanted vis-à-vis the bolt to push without a fine positioning is needed on site.

Of course, the mechanism is adaptable to any type of configuration and adapts dimensionally to all possible constraints. In addition, the use of the barrel is advantageously associated with a principle of organization chart thus providing a general password to firefighters, while lower level keys are provided to other stakeholders of the infrastructure, thus ensuring the full right of access to these stakeholders while allowing intervention by firefighters.

Other advantageous features of this device, taken individually or in any technically possible combination, are set forth in dependent claims 2 to 8.

• la figure 1 est une coupe très schématique d'un accès de secours associé à un dispositif de mise en sécurité conforme à l'invention ;
• la figure 2 est une vue en perspective du dispositif de la figure 1 ;
• la figure 3 est une vue en perspective éclatée du dispositif de la figure 2 ;
• les figures 4 et 5 sont des vues en élévation selon la flèche IV de la figure 3, qui montrent le dispositif assemblé, avec des constituants de ce dernier non représentés pour des raisons de compréhension, et qui illustrent respectivement deux configurations de fonctionnement distinctes ; et
• les figures 6 et 7 sont des vues en perspective d'un outil de secours, illustrant respectivement deux configurations d'utilisation différentes de l'outil.

The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the drawings in which:

• the figure 1 is a very schematic section of an emergency access associated with a safety device according to the invention;
• the figure 2 is a perspective view of the device of the figure 1 ;
• the figure 3 is an exploded perspective view of the device of the figure 2 ;
• the Figures 4 and 5 are elevation views along arrow IV of the figure 3 , which show the assembled device, with constituents of the latter not shown for reasons of understanding, and which respectively illustrate two distinct operating configurations; and
• the Figures 6 and 7 are perspective views of a rescue tool, illustrating respectively two different configurations of use of the tool.

On the Figures 1 to 3 there is shown a device 1 intended to secure an emergency access 2. In the example considered at figure 1 this access 2 is in the form of an opening defined in a floor masonry 3. This opening connects a vertical shaft 4, which leads down to a public infrastructure, such as a subway station or a tunnel, outside 5. Well 4 is intended to be used by rescue teams, such as firefighter crews, who have access from outside 5 inside the metro station, when an emergency response, for example following an accident or a fire in the station.

In order to reserve access 2 to rescue teams, this access is not normally used by the public. To this end, the access 2 is closed by a horizontal trapdoor 6. On one of its sides, this hatch is hinged, by any appropriate means, with respect to the floor masonry 3, between a closed position, represented to the figure 1 , in which the upper face of the hatch extends flush with the upper face of the masonry floor, and an open position, not shown, in which the hatch is tilted around its articulated side, as indicated by the arrow 7 at the figure 1 , to clear access 2 and allow the free passage of rescue teams.

The hatch 6 is held in its closed position by a lock 8 carried by the door on the side of the well 4 and including a movable bolt 9. At rest, as shown in FIG. figure 1 this bolt is deployed relative to the rest of the lock 8 so as to be engaged with a striker 10 secured to the floor masonry 3. In this configuration, the bolt and the striker cooperate to prevent the articulation of the door and thus keep the latter in its closed position.

The lock 8 is advantageously provided with an actuating pallet 11, commonly called "anti-panic pallet". Indeed, this pallet is arranged on the side of the hatch 6 facing the well 4, so as to be actuated by a user arriving to the hatch from inside the station or tunnel. Thus, in the event of an incident, a traveler who attempts to exit the station by the well 4 from the station is able to quickly and easily actuate the pallet 11 to cause the retraction of the bolt 9 inside the lock. 8, which releases the bolt vis-à-vis the keeper 10 and allows the opening of the trap according to the arrow 7.

Regardless of the possibility of retracting the bolt 9 by actuating the lock 8 by the panic pallet 11, the device 1 is adapted to control the retraction of the bolt 9 in the lock 8 from the outside 5. Typically, the device 1 is used by rescue teams located outside and must open the hatch 6 to go through the emergency access 2.

For this purpose, as indicated very schematically on the figure 1 and as shown in more detail on the figures 2 and 3 , the device 1 comprises a rigid frame 20 of elongated overall shape. This frame includes an elongated flat base 21 and an elongated flat plate 22, parallel to each other and firmly fixed to one another, with the interposition of two spacers 23 and 24 respectively located at the longitudinal ends of the base and platinum. In practice, the base 21, the plate 22 and the shims 23 and 24 are assembled to each other by screws or similar fastening means, not shown in the figures, being noted that the receiving holes of these screws are as for them clearly visible to the figure 3 .

At one of its longitudinal ends, the frame 20 also comprises a front plate 25 which extends in a plane perpendicular to the base 21 and the plate 22, being for example fixedly connected to the end wedge 24 In the implanted configuration of the device 1, that is to say when this device is arranged vis-à-vis the emergency access 2 as on the figure 1 , the frame 20 is fixedly secured to the floor masonry 3, inside a niche 12 delimited by this masonry. This niche 12 communicates with both the outside 5 and the well 4, so that the frame 20 is implanted in this niche so that its plate 25 extends in the extension of one of the walls delimiting the well 4, while that the end of the frame 20 opposite the plate 25 is located opposite the outlet on the outside 5 of the recess 12.

In practice, the fixing of the frame 20 to the floor masonry 3 is carried out by any appropriate means, either by direct anchoring of at least one of the components of the frame in this masonry, or with the interposition of a mechanical fixing bracket, permanently sealed in masonry.

In order to act by pressing against the bolt 9, the device 1 comprises a thrust piece 30 in the form of a metal strip extending parallel to the overall plane of the plate 25. As described in detail below, this piece 30 extends, in use, along a side 25A of the plate 25, movably between retracted and extended extreme positions, which are respectively shown at Figures 4 and 5 and in which the piece 30 is respectively set back and beyond the face 25B of the plate 25, facing the well 4, relative to the rest of the frame 20. In the implanted configuration of the device 1, the 25A side of the plate 25 is disposed relative to the bolt 9, so that the thrust member 30 is located opposite the bolt in the direction of movement of this part between its retracted and deployed positions. In this way, it is understood that when the piece 30 moves from its retracted position to its extended position, it can bear against the bolt 9 so as to retract it into the lock 8 and thus free it from the striker 10 to release the hatch 6.

For this purpose, the device 1 comprises a mechanism 40 for maneuvering the thrust piece 30 between its retracted and deployed positions. This mechanism comprises several constituents movably supported by the frame 20, as detailed below.

The mechanism 40 thus comprises a lock cylinder 42 having the overall shape of a cylinder, adapted to receive a key 44 ( Figures 6 and 7 ) specific to the barrel. More specifically, the barrel 42 internally defines a slot 46 for introducing the key 44 into an internal volume of the barrel, which is not visible in the figures, in which the internal mechanical components of this barrel and the key 44 cooperate by contact to allow the barrel to rotate. driving rotation of the barrel on itself, that is to say around an axis XX which corresponds to the longitudinal central axis of the barrel. To this end, the key 44 has a matched profile to the aforementioned internal constituents of the barrel, so that the use of a key that has a different profile would not rotate the barrel. In practice, the barrel 42 is selected from barrels called "high security", that is to say barrels extremely difficult to crocheteriously fraudulent.

To allow to easily bring the key 44 into the barrel 42 by passing through the outlet of the recess 12 on the outside 5, the slot 46 opens on the outside of the barrel facing this outlet. Thus, the barrel 42 is located relative to the frame at the end of the latter opposite the plate 25. In practice, the barrel 42 is supported by a cover plate 26 of the plate 22, being noted that this plate 26 is omitted from the Figures 4 and 5 for reasons of visibility.

At its opposite end to the slot 46, the barrel 42 is secured to a protruding key 48 which extends in length in a diametrical direction to the barrel. This key 48 is received in a complementary recess 50 delimited in the central region of a cam 52 centered on the X-X axis. In this way, when the barrel 42 is rotated about the X-X axis in either of two possible directions, the cam 52 is driven in an identical rotational movement.

The cam 52 has, in cross section, a peripheral profile of elliptical shape, centered on the axis XX, as clearly visible on the figures 4 and 5 . When the cam 52 rotates about the axis XX, this elliptical profile is adapted to cooperate with the circular profile of a roller 58 assembled, freely rotatable about its central axis ZZ parallel to the axis XX, to a plate 60 which extends perpendicularly to the axis ZZ. This plate 60 is fixedly secured, by screws not shown, at a longitudinal end of an elongate rigid slideway 62 which, at its opposite bent end, is fixedly secured to the thrust piece 30, by screws not shown.

The wafer 60, the slideway 62 and the thrust piece 30 thus form an integral assembly, displaceable in translation relative to the frame 20 in a rectilinear direction T perpendicular to the X-X and Z-Z axes. For this purpose, the slide 62 rests in direct contact with the plate 22, advantageously with the interposition of a coating or a plate improving the sliding contact between the slide and the plate, in particular a coating or plate made of brass or Teflon (trademark). To effectively guide the slideway 62 in its direction of translation, the frame 20 is advantageously equipped with guide rails 27, laterally bordering the running portion of the slide. In the embodiment considered in the figures, these rails 27 are formed by the superposition of adequately shaped plates fixedly interposed between the plate 22 and the cover plate 26.

The drive in translation of the thrust member assembly 30 / slide 62 / plate 60 is controlled by the cam 52. Indeed, when this cam is rotated about the axis XX over a quarter of a turn, so to move from his position to the figure 4 to his position of the figure 5 , the elliptical contour of the cam is applied against the circular contour of the roller 58, which then rotates about itself about the axis ZZ, while being generally driven in the direction T, so as to move away from the axis XX. In this way, the roller 58 drives in translation the workpiece assembly 30 / slide 62 / wafer 60 in the direction T.

The mechanism 40 further comprises a spring 64 which extends in length in the direction of translation T, being interposed between, on the one hand, the wedge 24 and, on the other hand, a stop piece 66 integral with the slide 62. The spring 64 and the abutment piece 66 are indicated in dotted lines on the Figures 4 and 5 . In the exemplary embodiment considered in the figures, this piece 66 extends from the face of the slide 62 in sliding contact with the plate 22. To do this, this piece 66 extends through an opening 28 passing through apart from the platinum. The size of this opening 28, in the translation direction T, is sufficiently large to allow the translation of the stop piece 66, together with the slideway 62, without this stop piece coming into contact with the end edges of the stop. the opening. Thanks to this arrangement, the spring 64 is housed, in a protected manner, between the base 21 and the plate 22.

The operation of the device 1 will be described below, in the context of an example of an emergency intervention via the access 2.

In this case, a rescue team, including a fire brigade team, is outside the emergency access 2. To open this access, the firefighters operate the device 1 in order to release the hatch 6. For this purpose, one of the firefighters advantageously uses the ax 70 shown in FIGS. Figures 6 and 7 . This ax includes an elongated handle 72, a longitudinal end of which is provided with an ax blade 74. The handle 72 delimits, in its running portion, an inner housing 76 intended to receive the key 44 specifically adapted to the barrel 42. The key 44 is pivotally assembled to the handle 72 about an axis 78 perpendicular to the longitudinal direction of the handle. This key 44 can thus be tilted between a retracted position, represented in FIG. figure 6 wherein the key extends in length in the longitudinal direction of the handle, being concealed in the housing 76, and an extended position, shown in FIG. figure 7 , in which the key extends outside the housing 76, perpendicularly to the handle 72.

In order to actuate the device 1, the firefighter tilts the key 44 of its ax 70, from its retracted position of the figure 6 to his deployed position of the figure 7 , as indicated by the arrow 80. In practice, not represented on the Figures 6 and 7 , locking means are provided on the handle 72, so as to hold the key 44 in one and / or the other of its positions retracted and deployed, so that the firefighter acts manually on these locking means to deploy the key 44.

While the key 44 is deployed relative to the handle 72, the firefighter manipulates his ax 70, so as to introduce the key 44 into the barrel 42, via its slot 46, passing this key through the outlet of the niche 12 on the outside 5, as indicated by the arrow 82 at the figure 1 . By then driving its ax 70 a quarter turn around the axis XX, and this indifferently in a clockwise direction or in a counterclockwise direction as respectively indicated by the arrows 84 and 86 at the figure 4 , the firefighter drives the barrel 42 in rotation about itself about the axis XX and, thereby, the cam 52. As explained above, the rotation of the cam causes the rectilinear translation of the thrust piece 30, via the roller 58, the wafer 60 and the slide 62. The thrust piece 30 then acts in the direction of translation T on the bolt 9, as indicated by the arrow 88 to the figure 5 , to retract it inside its lock 8 and thus release it from the striker 10. The firefighter can then open the hatch 6 and thus release the emergency access 2.

During the drive in translation of the slide 62 to press the workpiece 30 against the bolt 9, the spring 64 is compressed, but this spring does not create a significant resistance for the fireman, the resistance of this spring being low, typically of the order of 5 daN. When the fireman clears the key 44 of the barrel 42, the spring 64 recalls the slide in its initial position of the figure 4 , which, on the one hand, by rolling support of the roller 58 against the cam 52, substantially reposition the barrel 42 in its initial position and, on the other hand, recalls the thrust piece 30 away from the bolt 9. In this way, when the emergency intervention ends and the hatch 6 is closed, the device 1 does not require any manipulation to be operated again during the next emergency intervention.

Thus, thanks to the device 1, the team of firefighters quickly and easily opens the emergency access 2. The actuation of the device 1 requires only one operator, whose actions can be performed in an extremely short time. In addition, the fact that the cam 52 allows to be rotated indifferently in the two possible directions of rotation about the axis XX, facilitates the intervention of the firefighter. Moreover, the cam 52 can even make one or more half-turns on itself without damaging the mechanism 40.

In practice, the components of the frame 20 and the mechanism 40, as well as the thrust piece 30 are made of resistant metals, which make the device 1 particularly reliable over time.

In addition, the metallic nature of the frame 20, the thrust member 30 and the mechanism 40 makes the device 1 resistant to attempted break-ins and, more generally, vandalism. As such, to further protect the barrel 42, the latter is advantageously surrounded by a rigid tube 90 carried by a cover 92 secured firmly to the cover plate 26, being noted that this cache is omitted on the Figures 4 and 5 for reasons of visibility. The protective tube 90 is assembled to the cover 92 in an idle manner, that is to say that it can freely rotate on itself about the axis XX, limiting the possibility of tearing or damage of the barrel 42 using a pair of pliers.

In addition, the fact of driving the thrust piece 30 in the rectilinear translation T effectively solicits the bolt 9 to retract in its lock 8. This effectiveness of action on the bolt is insensitive to the precise positioning of the piece thrust 30, as long as at least one longitudinal portion thereof is located opposite the bolt in the direction T. In other words, there is a certain freedom of implantation of the device 1 in the niche 12, without harming to its effectiveness.

• plutôt que d'être implanté dans la maçonnerie de sol 3, le dispositif 1 peut être mis en place dans une paroi de mur, notamment une paroi verticale délimitant un accès de secours normalement obturé par une porte ; le dispositif 1 peut même être fixé directement au dormant de l'ouvrant obturant normalement l'accès de secours, sous réserve que ce dormant présente une résistance structurelle suffisante ;
• la transmission du mouvement de translation entre la came 52 et la glissière 62 peut être assurée par d'autres pièces de transmission que le galet 58 et la plaquette 60 ; un appui direct entre la came et l'extrémité de la glissière est également envisageable ;
• la hache des figures 6 et 7 n'est qu'un exemple illustratif d'un outil de secours dont le manche est muni de la clé 44 permettant d'actionner le dispositif 1 ; d'autres outils à manche sont envisageables, tel qu'un pied de biche, etc. ; de même, chaque extrémité du manche est avantageusement munie d'un moyen d'action, de sorte que, par exemple, l'extrémité du manche 72 non représentée sur les figures 6 et 7 est ainsi munie d'un pied de biche ;
• d'autres aménagements visant à renforcer la résistance au vandalisme du mécanisme 40 sont envisageables ; en particulier, la fente 46 est avantageusement équipée d'une pastille anti-percement, non représentée sur les figures, limitant la possibilité d'introduire des outils de crochetage à l'intérieur du barillet 42 ; et/ou
• de même, la fente 46 peut être recouverte d'un bouchon amovible anti-poussière, pour empêcher l'encrassement du barillet 42.

Various arrangements and variants of the device 1 and the ax 70 described above are also conceivable. As examples:

• rather than being implanted in the floor masonry 3, the device 1 can be put in place in a wall wall, in particular a vertical wall delimiting an emergency access normally closed by a door; the device 1 can even be fixed directly to the frame of the opening normally closing the emergency access, provided that this frame has sufficient structural strength;
• the transmission of the translation movement between the cam 52 and the slideway 62 can be provided by other transmission parts than the roller 58 and the plate 60; a direct support between the cam and the end of the slide is also possible;
• the ax of Figures 6 and 7 is only an illustrative example of a rescue tool whose handle is provided with the key 44 for actuating the device 1; other tools with handles are possible, such as a crowbar, etc. ; likewise, each end of the handle is advantageously provided with a means of action, so that, for example, the end of the handle 72 not shown on the Figures 6 and 7 is thus provided with a crowbar;
• other arrangements to enhance the vandalism resistance of the mechanism 40 are conceivable; in particular, the slot 46 is advantageously equipped with an anti-drilling pellet, not shown in the figures, limiting the possibility of introducing hooking tools inside the barrel 42; and or
• likewise, the slot 46 may be covered with a removable dust-proof cap, to prevent fouling of the barrel 42.

Claims (8)

1. Device (1) for securing an emergency access (2) to a public infrastructure, comprising

   - a rigid striker (30) for a bolt (9) which, at rest, immobilises an openable cover (6) of the access;

   - a mechanism (40) for actuating the striker, this mechanism being operable from the exterior (5) of the infrastructure and adapted to apply the striker against the bolt such that the latter frees the cover to open the access, and

   - a support chassis (20) for the actuating mechanism, this chassis being adapted to be solidly fixed to a face of a wall or floor (3) delimiting the access, the mechanism (40) comprising also a locking barrel (42), adapted to be entrained in rotation on itself under the action of the key (44) which is specific to the barrel when this key is received in the barrel, and a cam (52) kinematically connected rotationally with the barrel and adapted to entrain in translation the striker (30) with respect to the chassis (20) in a rectilinear direction of movement (T).
2. Device according to claim 1, characterised in that the cam (52) is adapted to be rotated irrespective of the two possible senses (86, 88) of rotation for entraining the striker (30) in translation.
3. Device according to claim 1 or 2, characterised in that the barrel (42) is, at its end opposite to that by which the key (44) is inserted into the barrel, solidly attached to a cotter pin (48), received in a complementary recess (50) defined in the cam (52) for kinematically connecting the barrel and the cam.
4. Device according to any foregoing claim, characterised in that the mechanism (40) also comprises a rigid slider (62) which extends lengthwise in the direction of translation (T) and of which one end carries in a fixed manner the striker (30), whereas the other end constitutes a follower for the cam (52) with the possible interposition of at least one transmission member (58,60).
5. Device according to claim 4, characterised in that the chassis (20) is fitted with at least one fixed rail (27) for guidance of the translation of the slider (62) and which lies adjacent the length of this slider.
6. Device according to any foregoing claim, characterised in that the mechanism (40) further comprises a resilient means (64) for return of the striker (30), such as a spring interposed directly or indirectly between the cam (52) and the chassis (20) and adapted to be compressed in the direction of translation (T) when the striker is entrained by the cam towards the bolt (9).
7. Device according to any foregoing claim, characterised in that the striker (30) has an elongate form in a direction substantially perpendicular to the direction of translation (T).
8. Device according to any foregoing claim, characterised in that it also comprises a protective tube (90) for the barrel (42), assembled on the chassis (20) in an unconstrained manner.

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