EP2653821B1 - Sound suppressor for firearm - Google Patents

Description

The invention relates to a noise reducing or moderating device, intended to be associated with a firearm, and more particularly relates to a gas flow and exhaust system.

The invention will be more particularly described with regard to semi-automatic or automatic firearms, without being limited thereto.

A silencer allows by being mounted at the end of a firearm to reduce the sounds produced by the weapon and reduce the recoil, ensuring the relaxation of the gas used to project the projectile.

A silencer is generally formed of a cylindrical body whose end is adaptable to the muzzle of the barrel of the weapon, the inside of the body constituting a gas decompression chamber and being provided with baffles slowing the flow of gases while leaving a passage for the exit of the projectile.

Due to the rate of automatic gun fire, mufflers are subject to a high risk of overpressure due to gas build-up and high temperature rise.

• une dégradation des matériaux constitutifs du silencieux ;
• une augmentation de la pression appliquée sur les parties mobiles de l'arme (culasse et chargeur) ;
• une remontée des gaz vers la culasse de l'arme.

These two phenomena have several disadvantages, in particular:

• degradation of the constituent materials of the silencer;
• an increase in the pressure applied to the moving parts of the weapon (cylinder head and charger);
• a rise of the gases towards the breech of the weapon.

These effects can cause irreversible degradation of the muffler, or even the weapon, and / or fouling of the moving parts of the weapon leading to malfunctions such as jamming of the cylinder head while the charger continues its rearming cycle ammunition, which constitutes a significant risk for the user.

It is known from the US patent US 3,667,570 and the US patent application US 2008/0148928 , silencers comprising gas escape means in case of detected overpressure. In particular, the second document proposes an exhaust port closable by a movable ball mounted on a spring. The opening opens by removing the ball in case of overpressure detected, the gases pushing the ball mounted on the spring.

The object of the invention is to provide a solution that is different from the cited prior art.

In particular, the invention proposes a noise-reducing or silent device comprising gas flow means, which does not give rise to the aforementioned drawbacks, in particular which adapts to temperature and pressure increases within the weapon and silencer, allowing continued use of the weapon without disassembly of the silencer, while optimally preserving the function of the silencer noise reduction.

The invention therefore relates to a noise reducing device intended to be associated with a firearm, comprising a cylindrical body provided with a continuous central passage for the passage of the projectile, gas flow means able to evacuate at the same time. least part of the gases via closable exhaust means, closure means ensuring closing or opening the closable exhaust means, and triggering means actuating the closing means. The device is characterized in that the triggering means are adapted to be implemented when a temperature threshold value is reached.

The technical solution of the invention is thus dependent not on a detected gas overpressure but on the detection of a rise in temperature within the silencer body.

The triggering means are advantageously formed of at least one piece capable of being deformed under the effect of temperature, providing robust mechanical means and simple implementations. By way of example, such a part is a metal part of the bimetallic type. Other parts could be used without departing from the scope of the invention, such as based on so-called shape memory materials.

The term cylindrical when the body of the silencer includes any type of section, circular, square or other.

According to one characteristic, the closable exhaust means are part of additional exhaust means separate from the exhaust means formed by the distal end of the central passage of said device.

Therefore, the evacuation of gases is not done by the only end of the device from which the projectile leaves; if the temperature and pressure are too high, the hot gases escape by additional means that are the closable exhaust means, these means opening in response to the detection of a temperature considered to pose a risk to the user of the firearm for which the noise reducing device is intended.

The closable exhaust means are arranged so as to evacuate the gas radially and / or axially relative to the body of the device.

Preferably, these closable exhaust means are arranged at least near a distal end of the body of the device and corresponding to the end intended to be connected to the muzzle of the barrel of the firearm.

As indicated above according to the invention, the triggering means act on the closure means under the effect of temperature. By deforming and by cooperation with the closing means, the triggering means actuate said closing means to move them in rotation or translation.

Said triggering means generate for example a compression action on the closing means to make them mobile. Alternatively, by another arrangement of the triggering means with respect to the closing means, the triggering means are intended to exert traction on said closing means to make them mobile.

Advantageously, the closable exhaust means comprise at least one closable discharge lumen, preferably a plurality of lumens, the triggering means being implemented when a temperature threshold value is reached.

The exhaust port (s) and the triggering means thus form a discharge valve ensuring the escape of the hot gases contained in the body of the device. This discharge valve is implemented automatically when the internal temperature of the body of the device is too great.

Advantageously, the triggering means are suitable for generating the opening when a threshold temperature value is reached. This threshold temperature will depend in particular on the nature of the triggering means, the type of weapon (the length of the barrel), the caliber of the weapon, ammunition. It is for example 350 ° C.

The means for closing or sealing the exhaust closable means (the exhaust ports) advantageously consist of a wall delimiting a gas expansion chamber, this wall being movable in rotation or translation and able to close off or disengage the evacuation lights.

Thus, the device comprises an expansion chamber movable by translation or rotation, and cooperating with the triggering means which are able to actuate the movement of the chamber so that the lights are not closed and communicate with the interior of the chamber .

According to an exemplary embodiment, the body of the device has its wall provided with the escape ports, a projectile passage arranged inside the body, an expansion chamber of the gases surrounding the passage and able to communicate with the lights or to seal them, a sleeve enveloping all or part of said body and arranging with said body a cylindrical evacuation chamber which on the one hand communicates with the lights and on the other hand opens freely on the outside, in particular at a distal or proximal end of said body. Preferably, the evacuation chamber comprises means for slowing gas flow of the baffle type.

This cylindrical discharge chamber extending longitudinally to the body of the exhaust system and thus the device, provides a flow of gas out of the device and not their sudden output, ensuring the noise reduction function. Its volume is adapted to the type of firearm for which the silencer is intended.

The evacuation chamber is connected to the expansion chamber by the one or more lights of the exhaust means and by exhaust orifices arranged in the cylindrical wall of the chamber, the closure means controlled by the triggering means ensuring the setting or not of the lights with the orifices of escape. The closing means are advantageously formed by the wall of said expansion chamber at the level of the solid areas devoid of exhaust orifices.

Also the expansion chamber is movable by translation or rotation, the triggering means actuating the movement of the chamber so that the lights are not closed and communicate with the interior of the expansion chamber during the detection of a temperature too important.

Advantageously, the triggering means consist of at least one thermostatic bimetallic strip able to deform as a function of temperature.

The triggering means, such as the bimetallic strips, are able to move the closing means of the evacuation ports by rotation or translation, in particular by compressively pressing against the closing means.

The type of bimetallic strip (nature of the materials of the bimetallic strip, its shape, its dimensions) and their number will be chosen as a function of the target threshold temperature and the compressive force to be exerted to ensure the movement of the expansion chamber. The caliber of the weapon concerned will of course play a role.

Preferably, the bimetal is able to exert a pressure force when deformed by at least 1 daN. It has for example a thickness of the order of 0.5 mm.

For example, a bimetallic trade will be chosen, such as the commercial reference product IN540 Aperam Imphy.

The bimetallic strip may be in the form of a washer, and may be a sudden turning, in particular to ensure a translational movement of the closure means (the expansion chamber).

Alternatively, it may have a spiral shape, in particular to generate a rotational movement of the chamber.

Preferably, the tripping means, in particular the bimetallic strip or bimetals, are located outside the gas expansion chamber of the exhaust system so that the gases containing corrosive particles do not deteriorate them.

According to an advantageous characteristic, the noise reducing device comprises a cylindrical shaped noise reducing portion of the usual type, as provided with baffles, and the closable exhaust means associated with the triggering means form a closable exhaust system. cylindrical body gas, said noise reducing portion being arranged in the extension of the exhaust system by being detachably coupled thereto or not.

The invention also relates to a firearm comprising the above-mentioned reducing and exhausting device, the device being connected to the muzzle of the gun barrel.

The device can also be reported around a firearm flame shield.

When the exhaust system is removable from a common noise reduction gear portion to be coupled to a weapon, the system then forms a removable interface unit between the weapon and the conventional noise reducer, allowing the system to Exhaust of the invention to adapt to existing silencers.

The noise reducing device or the exhaust system comprises a distal end whose characteristics are suitable for cooperating with a firearm, for example by screwing, while its opposite end may be extended by a portion of conventional baffle muffler, or includes means for mutual cooperation to be coupled to an existing silencer.

The noise reducing device or the exhaust system has length and diameter dimensions adapted to the weapon to which the device is intended and is also related to the volume of the body of said device. Considering its integration or coupling to a noise reduction device of the usual type, the exhaust system will be adapted.

In the remainder of the description, the terms "upstream" and "downstream" are understood to mean elements of the device in the context of the normal implementation of the device with a firearm, the upstream being located on the side of the weapon while the downstream corresponds to the opposite, part from which the projectile leaves.

The term "operating position" or "open position" of the device, the position in which the closable gas exhaust means are open to discharge hot gases out of the device. On the contrary, the "rest position" or the "closed position" corresponds to the position for which the gases can not escape via the exhaust seal means.

In the embodiment described below, which is in no way limiting, in the operative position of the device, not all the lumens of the expansion chamber suddenly open in response to the heating of the inside of the body of the device; the opening of the lights is done gradually during the gradual movement of the expansion chamber, in particular via a rotary movement, as a function of the progressive deformation of the bimetal or bimetals.

• La figure 1 représente une vue schématique en coupe du dispositif réducteur de bruit (silencieux) de l'invention et associé au canon d'une arme à feu, le dispositif étant à l'état de repos;
• La figure 2 représente la figure 1 en position de fonctionnement du dispositif ;
• Les figures 3 et 4 sont des vues en perspective du dispositif, selon respectivement le côté amont et le côté aval ;
• La figure 5 est une vue en perspective éclatée du dispositif des figures 3 et 4 selon un mode de réalisation ;
• Les figures 6 et 7 sont des vues en coupe longitudinale du dispositif de la figure 5, selon respectivement en position de repos et en position de fonctionnement, le déplacement des moyens de fermeture étant par translation ;
• Les figures 8 et 9 illustrent une variante de réalisation du dispositif selon respectivement deux vues en coupe longitudinale en position de repos et en position de fonctionnement, le déplacement des moyens de fermeture étant par rotation ;
• La figure 10 est un exemple de réalisation d'un moyen de déclenchement du dispositif de l'invention, en particulier un bilame ;
• La figure 11 est une vue en perspective d'une variante supplémentaire du dispositif de l'invention, le déplacement des moyens de fermeture s'effectuant par rotation
• La figure 12 correspond à la figure 11 sans la portion cylindrique du corps du dispositif.

The present invention is now described with the aid of examples which are only illustrative and in no way limit the scope of the invention, and from the attached illustrations, in which:

• The figure 1 is a schematic sectional view of the noise reduction device (silencer) of the invention and associated with the barrel of a firearm, the device being in the state of rest;
• The figure 2 represents the figure 1 in operating position of the device;
• The Figures 3 and 4 are perspective views of the device, respectively on the upstream side and the downstream side;
• The figure 5 is an exploded perspective view of the device Figures 3 and 4 according to one embodiment;
• The Figures 6 and 7 are views in longitudinal section of the device of the figure 5 , respectively in the rest position and in the operating position, the displacement of the closing means being by translation;
• The Figures 8 and 9 illustrate an alternative embodiment of the device respectively according to two views in longitudinal section in the rest position and in the operating position, the displacement of the closure means being rotated;
• The figure 10 is an exemplary embodiment of a triggering means of the device of the invention, in particular a bimetallic strip;
• The figure 11 is a perspective view of a further variant of the device of the invention, the displacement of the closing means being effected by rotation
• The figure 12 corresponds to the figure 11 without the cylindrical portion of the device body.

The Figures 1 and 2 schematically illustrate a noise reducing or silent device 1 coupled to the mouth 3 of a gun barrel.

The device of the invention shown here comprises, what is hereinafter referred to as the exhaust system 2, and the usual part 10 of a silencer equipped with baffles 11. The exhaust system 2 constitutes an interface unit between the mouth 3 of the barrel and a part of usual silencer.

The system 2 is arranged upstream of the silencer at the outlet of the mouth 3 of the barrel where the concentration of the gases is the largest, before the latter flow downstream through the baffles 11 to the orifice downstream output 14 of the silencer.

The exhaust system 2 is provided at one of its distal ends with coupling means, not shown here, to cooperate removably and locked with the mouth 3 of the barrel. These means are for example of the type known per se such as the usual means of coupling a muffler on the mouth of a gun barrel.

With regard to all the figures, the exhaust system 2 is an integral part of the silencer 1, the part 10 with baffles being machined in its extension.

As a variant, the exhaust system 2 may be removable and intended, if necessary, to be associated by its downstream distal end 26 with the upstream free end of the baffle portion 10 by means of mutual cooperation and locking, for example same type as the coupling means of said system to the mouth of the barrel. The Figures 8 and 9 illustrate the exhaust system 2, its downstream end 26 having for example a thread for its possible cooperation with a usual muffler. The exhaust system may not be associated and constitute in itself the noise reduction device of the invention.

With regard to the various figures, the exhaust system 2 and the baffle part 10 respectively have a cylindrical longitudinal body 20 and 12 respectively provided with a continuous central passage 21 and 13, the passage 21 of the system 2 cooperating with the orifice central 30 of the mouth 3 of the barrel, allowing the crossing of a projectile from the barrel outlet to the output downstream 14 of the silencer.

The usual baffle portion 11 is of the known type and its technical characteristics are not further described here. The baffles guarantee a reduction of the noise because they provide a slowing of the flow of the gases which are derived from the combustion of the propellant charge of the projectile, and ejected from the mouth of the barrel to the downstream end outlet of the silencer.

The exhaust system 2 of the invention is intended to evacuate in a complementary manner these gases when they become too hot, to avoid any risk to the user and possible damage to the weapon and / or of the silencer.

The exhaust system 2 is thus mounted in interface between the mouth 3 of the barrel of the weapon and the part 10 with baffles in order to detect as close as possible to the barrel the rise in temperature of the constituent elements of the mobile part of the weapon , generated by the confinement of hot gases.

The exhaust system 2 ensures the escape of gases outside and upstream of the silencer and radially to its cylindrical body. It is implemented only when its constituent parts risk present a temperature for which it is considered that a risk of dysfunction of the weapon exists.

For example, it is desired that the parts can not reach a temperature of 400 ° C. The system of the invention is therefore designed to be triggered when a target value of 180 ° C for example is reached in order to be fully operational for a threshold temperature of 350 ° C.

The system of the invention comprises an expansion chamber 22 of the gases which forms the central passage 21 and in which the hot gases evolve, the closable exhaust means 4 associated with the expansion chamber and schematically represented on the Figures 1 and 2 in respectively closed and open position. On the figure 2 is represented by arrows the gas leak when the exhaust means 4 are open.

In addition, in order to give the exhaust system also the function of noise reduction, the gases once evacuated by the exhaust means 4 flow through an evacuation chamber 60 delimited by the body 20 of the system 2 and a sheath 6 and comprising an evacuation outlet 62.

The opening of the exhaust means 4 is provided by triggering means which depend on the comparison between the effective temperature at the upstream end of the expansion chamber and the set temperature of said triggering means. These triggering means are described below.

• le corps cylindrique 20 solidaire à son extrémité aval du corps de la partie 10 à chicanes, une pluralité de lumières 23 étant ménagées dans la paroi du corps 20 et sur sa périphérie ;
• un ensemble 15 de chicanes 11 séparées par des entretoises 16, cet ensemble étant destiné à être agencé à l'intérieur de la partie 10 du corps 20 et comprenant le passage central continu 21 pour le projectile,
• la chambre d'expansion 22 des gaz destinée à être agencée à l'intérieur du corps 20 et à être mise en regard des lumières 23, la chambre 22 comprenant des orifices d'échappement 24 qui sont destinés à être mis en communication avec les lumières 23 en position de fonctionnement du système. Les lumières 23 forment les moyens d'échappement obturables 4 du dispositif ;
• un fourreau 6 destiné à envelopper le corps 20 sur au moins une partie de sa longueur de façon à être en regard des lumières 23, le fourreau étant à distance de la paroi du corps 20 pour réserver un espace 60 (figures 6 et 7) ci-après dénommé chambre cylindrique d'évacuation ;
• une bague de fermeture 9 destinée à être verrouillée sur l'extrémité amont 27 du corps 20, de façon à maintenir assemblé l'ensemble des pièces précitées.

Advantageously, the exhaust system 2 of the invention is removable. Next to the exploded view of the figure 5 , the system 2 comprises:

• the cylindrical body 20 integral at its downstream end of the body of the baffled portion, a plurality of slots 23 being formed in the wall of the body 20 and on its periphery;
• an assembly 15 of baffles 11 separated by spacers 16, this assembly being intended to be arranged inside the part 10 of the body 20 and comprising the continuous central passage 21 for the projectile,
• the gas expansion chamber 22 intended to be arranged inside the body 20 and to be placed opposite the openings 23, the chamber 22 comprising exhaust ports 24 which are intended to be placed in communication with the lights 23 in the operating position of the system. The lights 23 form the closable escape means 4 of the device;
• a sheath 6 intended to envelop the body 20 over at least a part of its length so as to be opposite the openings 23, the sheath being at a distance from the wall of the body 20 to reserve a space 60 ( Figures 6 and 7 ) hereinafter referred to as a cylindrical evacuation chamber;
• a closure ring 9 to be locked on the upstream end 27 of the body 20, so as to maintain assembled all of the aforementioned parts.

The expansion chamber 22 forms the central passage 21 through which the projectile will pass longitudinally and in which the hot gases will arrive from the mouth of the barrel.

In addition, the expansion chamber 22 is provided at its cylindrical wall of the exhaust ports of the gas 24 which are adapted to cooperate by being placed in register with the openings 23 of the wall of the body 20 so that the chamber Expansion communicates via its orifices and said lumens with the evacuation chamber 60.

According to the invention, the wall of the expansion chamber 22 is able to be movable and forms the closing / opening means of the exhaust seal means 4 corresponding to the lights 23.

As illustrated on Figures 6 and 7 , the evacuation chamber 60 is closed at its upstream end 61 being integral with the wall of the body 20 and is open at its opposite end downstream to constitute the discharge outlet 62 opening freely on the outside.

With regard to Figures 5 to 7 are advantageously installed in the volume of the evacuation chamber 60, protruding portions 25, preferably machined with the wall of the body 20. They constitute spacers between the sheath and the body, and reinforce the rigidity of the association sheath-body of the silencer.

In the closed position of the exhaust system ( figure 6 ), the exhaust ports 24 can not communicate with the lights 23, the expansion chamber 22 being closed. The gases therefore flow only via the passages 21 and 13 to escape via the downstream outlet 14 of the silencer.

In the open position of the exhaust system ( figure 7 ), the exhaust orifices 24 are opposite the openings 23, a large part of the gases coming from the combustion and being in the expansion chamber 22 can therefore escape outside said chamber and flow into the evacuation chamber and evacuate via the radial outlet 62.

The communication between the lights 23 and the exhaust ports 24 is obtained by the movement of the expansion chamber 22. This movement, by translation or rotation, is controlled by the triggering means 5 ( Figures 6 and 7 ).

The triggering means 5 are arranged inside the body 20 of the exhaust system 2 and outside the gas expansion chamber 22.

In the embodiment illustrated on the Figures 6 and 7 , the expansion chamber 22 is movable in translation in the manner of a drawer. The chamber 22 is able to move back to its initial position by a spring 7 abutted against on the one hand the downstream end 26 of the body 20, and on the other hand the downstream slice 22B of the wall of the room 22.

The downstream end 26 advantageously has a convergent cone shape towards the interior of the body of the system. This surface shape makes it possible to better oppose the pressure experienced by the spring during the translational thrust of the chamber.

The triggering means 5 cooperate with the chamber 22 by being on the one hand integrally fixed by one of their free ends 50 to the body 20, and on the other hand supported by their opposite free end 51 against the upstream edge 22A of the cylindrical wall of the chamber.

The triggering means 5 are able to deform to exert a compression against the upstream edge 22A of the chamber 22, causing the chamber to move downstream of the system, the downstream slice 22B of the chamber compressing the spring 7 in turn.

The triggering means 5 are advantageously a thermostatic bimetallic which is deformed as a function of temperature. It is in the form of a sudden turning washer.

So, looking at the sectional view of the figure 6 the bimetallic strip 5 is in the rest state, having a V-shaped section open towards the upstream distal end of the body 20, while opposite the figure 7 when the temperature has risen significantly, it has deformed in an opposite direction as a V open towards the proximal end of the body 20

In the variant embodiment illustrated in sectional views of Figures 8 and 9 , the displacement of the expansion chamber 22 is by rotation with the aid of at least one bimetallic strip, in particular of two bimetallic strips 5A and 5B.

The bimetals 5A and 5B are identical. They have a spiral or semi-spiral shape as illustrated on the figure 10 . When bimetallic is deformed, it unfolds.

Each bimetal is housed inside the expansion chamber 22 adapted to pivot, and is fixed on the one hand by one of its ends 50 to the body of the system at the upstream end 22A, and secondly by its opposite end 51 to the inner wall of the chamber 22.

In the embodiment example above, under the effect of the heat due to an excess of pressure and temperature in the upstream part of the body of the system, the bimetallic strips deform in a radial elongation, their body abutting against the inner wall of the chamber. Further development results in a pushing force against the wall of the chamber which thus pivots, causing the discharge orifices 24 facing the lights 23 (FIG. figure 9 ). When the temperature drops, the bimetallic strips gradually return to their initial state, causing the chamber to rotate in the opposite direction and causing the lights 23 to gradually close. Once the bimetallic strips have returned to their initial state, the lights 23 are completely closed.

As soon as the pressure and temperature increase again within the system, the triggering means will again be able to activate to ensure the opening of the closing means and consequently the opening of the exhaust means from which the gases hot will escape outside the system.

Other variants of triggering means could be used without departing from the scope of the invention.

The Figures 11 and 12 illustrate yet another alternative embodiment of the invention. For a simplification of the figure 11 , the sheath of the device (reference 6 on the Figures 5 and 6 ) which surrounds a portion of the cylindrical body 20 has not been shown. The figure 12 is a detail view of the figure 11 without the presence of the cylindrical body 20.

The closure means, constituted by the wall of the expansion chamber 22, are in this latter variant, movable in rotation.

With regard to the figure 12 , the triggering means 5 are formed by two bimetals 5C and 5D arranged side by side. The triggering means 5 are arranged outside the expansion chamber 22 and cooperate with it by traction when they deform. Each end 51 of the bimetallic strips is engaged in a fork 22A projecting (longitudinally) from the wall of the expansion chamber 22. The opposite end 50 of the bimetallic strips is fixed on the body 20 of the device.

By deforming, the bimetals 5C and 5D exert a traction force on the fork 22A causing its pivoting and thus the rotation of the chamber 22. The wall of the chamber 22 has discharge orifices 24 which are here oblong, just like the exhaust ports 23 of the cylindrical body 20 ( figure 11 ). The rotation of the wall of the chamber brings the discharge orifices 24 opposite the lights 23.

Thus, the fastening of the triggering means respectively, to the body of the system provided with the escape ports, and to the movable closing means (formed by the wall of the expansion chamber), allows the movement of said closing means in order to shut off or not said lights.

Claims (13)

1. Noise reducer device intended to be connected to a firearm, consisting of:

   - a cylindrical body with a continuous central passage,

   - gas flow means with the capacity to evacuate at least part of the gas through closable exhaust means (4),

   - closing means (22) which guarantee the closing or opening of closable exhaust means (4).

   - activation means (5) which actuate the closing means (22),
   characterised in that the activation means (5) are ready for set up when a threshold temperature is attained.
2. Device according to claim 1, characterised in that the activation means (5) are formed of at least a part which can be deformed under the influence of temperature.
3. Device according to claims 1 or 2, characterised in that the activation means (5) actuate the closing means (22), specifically through compression against said closing means (22), to displace them by rotation or translation.
4. Device according to any of the preceding claims, characterised in that the closable exhaust means (4) include at least a closable evacuation hole (23), preferably several holes.
5. Device according to any of the preceding claims, characterised in that the closing means, in particular formed by the wall of an expansion chamber, are mobile thanks to the action of activation means.
6. Device according to claim 4, characterized in that it comprises a mobile expansion chamber (22) for translation or rotation, and cooperating with the activation means (5) which are able to actuate the displacement of the chamber in order for lights (23) not to be obstructed and can therefore communicate with the inside of the chamber.
7. Device according to claim 4 or 6, characterised in that it comprises a body (20) with the wall including holes (23), a passage (21) for missile provided in the inner part of the body (20), a gas expansion chamber (22) surrounding the passage (21) capable of communicating with holes (23) or obstructing them, a cover (6) which envelops all or part of the aforementioned body (20) thereby arranging an evacuation cylindrical chamber (60) with the body, which on the one hand communicates with the holes (23) and on the other hand, freely opens onto the outside, specifically into a distal end.
8. Device according to anyone of the preceding claims, characterised in that it comprises a gas evacuation chamber (22), which includes slowdown means (62) for gas flow such as baffles.
9. Device according to anyone of the preceding claims, characterised in that the activation means (5) consist of at least a thermostatic bimetal which can be deformed by changing temperatures.
10. Device according to anyone of the preceding claims, wherein the closable exhaust means are arranged in such a way that the gas is evacuated radially and/or centrally with respect to the body of the device.
11. A device according to anyone of the preceding claims, wherein the closable exhaust means may be part of complementary exhaust means which are different from exhaust means developed by the distal end of the central passage of the said device.
12. A device according to anyone of the preceding claims, characterised in that it comprises a part of noise reducer (10) with a cylindrical shape and of a known type, such as with baffles (11), and the closable exhaust means (4) associated with activation means (5) develop a closable gas exhaust system (2) of cylindrical shell, said aforementioned noise reducer being provided in line with the extension of the exhaust system, be it detachable or not.
13. Firearm, characterised in that it includes a device according to anyone of the preceding claims, said device being connected to the muzzle of the barrel (3) of the firearm.

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