LU93184B1 - Sound neutralizing device for a firearm - Google Patents

Abstract

A sound suppressing device for a firearm, in particular for a rifle or another long or short firearm and a method of neutralizing sound, comprising: a shutter mechanism (10) comprising at least one transversely mounted shutter (10) to the axis on the barrel (42) of the firearm to temporarily close the barrel after the passage of a munition and prevent the passage of the combustion gases and the sound wave towards the mouth of the barrel when blow is drawn, an actuating unit (31,34,35) having a movable portion (31) arranged axially on the barrel of the firearm to set in motion a control mechanism (6), the axially movable part (31) having an internal bore adapted to allow the passage of a munition, the control mechanism (6) comprising at least one amplitude lever arm (8) pivotally mounted on a pivot (7) fixed to the barrel, each amplitude lever arm (8) being coupled respectively to a closing flap (10), the movable actuating unit (31,34,35) cooperating with the control mechanism (6) to allow transverse movement of the at least one closure flap (10) between a position in which the shutter mechanism (10) ensures the passage of the munition towards the mouth of the barrel (42) and a closed position preventing the passage of the combustion gases and the sound wave after the passage of the munition, and a exhaust unit (11, 21-27) having at least one exhaust pipe (11, 21) disposed on the barrel upstream of the shutter mechanism (10) to redirect and leave the combustion gases and the sound wave evacuate out of the barrel. 93184

Description

Sound neutralizing device for a firearm

The present invention relates to a firearm neutralizing device, particularly for a rifle or other long or short firearm, and a method of neutralizing sound for a firearm.

Technical area

According to a first aspect, the present invention more specifically relates to a sound neutraliser for a firearm, such as a rifle or another long or short firearm.

According to a second aspect, the invention proposes a method of neutralizing sound for a firearm, in particular for a rifle or another firearm when a shot is fired.

According to a third aspect, the invention proposes a firearm, in particular a rifle, comprising an improved sound neutralizing device.

Indication of the prior art:

Regarding the state of the art, there is the conventional silent that can be added to a firearm, gas or air, also called sound moderator, which attempts to mechanically reduce the latter. For example, the publication WO 96/03612 discloses a sound moderating device for Ball Trap rifle or recreation guns superimposed calibres. This gun silencer consists of a tubular body mounted on the barrel of the gun and comprising an annular expansion chamber behind said tubular body, and a series of transverse internal baffles supported by spacers and provided with openings passing through lead shot and wad. The silencer is designed to dampen noise and reduce noise pollution.

The publications WO 2011/035111 A1 and WO 2014/000805 disclose other examples of firearm silencers, in particular for automatic rifles or other long firearms, comprising a silencer mounting on the barrel of the weapon, a muzzle brake, which can be connected by screwing to the silencer, being fixed on the barrel.

Classic silencer

A conventional sound suppressor or moderator is a device that can be added to a firearm, gas or air, to reduce the noise and the flash of light it produces when a shot is fired, thereby gaining discretion .

To do this, the silencer generally takes the form of a cylindrical tube that can adapt to the muzzle of the barrel, and whose internal mechanism, which varies according to the ammunition used, allows to relax the gases used to propel the barrel. projectile, so as to minimize their release into the atmosphere.

As the silencer only slows the gas at the exit of the barrel, it does not interfere with the noise caused by the passage of the projectile at supersonic speed (speed higher than that of the sound which is about 340 m / s in the air at 15 ° C) which, passing the wall of sound, produces itself a sound of detonation on its course. The phenomenon is especially noticeable on high initial velocity calibres such as 5.56 mm. For some cartridge calibers, especially for handguns, there are subsonic ammunition created specifically for use with a silencer to minimize the sound of firing.

A muffler is especially a comfort tool because it reduces the muzzle wave of a gun. This mouth wave is the cause of ENT trauma, in the area of the nose, throat and ears, that can not be protected by the usual means (ear plugs, helmets ...).

It should be noted that the two main factors affecting the value of the speed of sound are the density and the elasticity constant (or compressibility) of the propagation medium:

The propagation of sound is all the more rapid as the density of the medium and its compressibility are small. From one medium to another, the two parameters change. In helium, whose compressibility is approximately equal to that of air, but whose density is, under the same conditions of temperature and pressure, much lower, the speed of sound is almost three times higher great than in the air. In a gas at atmospheric pressure, the speed of sound is much lower than in a liquid: although the density of the gas is much lower, it is almost infinitely more compressible than the liquid (which is often considered incompressible) .

For example, the sound propagates exactly at 1,482,343 m / s in pure water at 20 ° C, approximately 340 m / s in air at 15 ° C and at about 1,500 m / s in seawater The efficiency of the silencers is relative: the sound reducer suppresses the mouth wave and consequently the detonation consistent and makes the sound more diffuse while removing the flame to the mouth of the weapon. The term moderator of sound is sometimes used; the performance of this type of device is very variable, depending on the type of reducer of his employee and Parma used. Shooting is not as far away, it is also harder to identify as a firearm shot as well as more difficult to locate because of both the deformation of the sound and the absence of a visible flame. The decrease in the intensity of the noise is of the order of 25 to 35 db in the case of an assault rifle, that is to say 115 to 125 db (comparable to a jackhammer) instead of 150 db. The classic silencers, while being able to present different shapes and techniques, are nevertheless quite similar to each other, they are generally sleeves that are fixed, either by a bayonet system or by a screw thread, at the end of the barrel.

These sleeves, of a substantial size, have inside several gas expansion chambers that can mitigate the noise of the detonation with more or less success. The projectile, the gases and the residual sound wave come out through the mouth.

Their defects are: heavy weight (several hundred grams, even more than a kilo), large dimensions, imbalance of the weapon (it pricks), impossibility of using it in double barrel weapons as well as, the most of the time, with shot ammunition.

Moreover, the diameter of the holes separating the different elements of the silencer through which the projectiles pass being much larger than the caliber, they allow to escape towards the front of the projectile a part of the gas thus disturbing the accuracy of the projectile and decreasing its speed. about 4 to 6 m / s.

The classic silencer is expensive, difficult to maintain (to clean it must be removed completely component by component), and for some rifle models, its life does not exceed 800 shots.

The projectile passing the different baffles allows the gases behind it to relax in the cells and thereby reduce the intensity of the sound wave. The effectiveness of such a silencer lies in two factors: its dimensions (the more it is larger the more it damps), and the distance that separates it from the combustion chamber (the further away it is, the more effective it is). Since it is located at the end of the barrel, so the longer it is, the more effective the silencer will be. It will have virtually no effect if it is used with very short barrel weapons, unless it is greatly oversized.

On this type of noise reduction noise is a function of the size of the chambers (cells). The noise normally produced by a gun detonation is in the range of 120 to 170 db. Thus a sudden noise or prolonged exposure to a sound environment too high (beyond 100 db) can cause temporary or permanent impairment of hearing.

In addition, implementation difficulties are also present in particular for some conventional silencers or that are not effective enough to reduce the noise when a shot is fired with the weapon which poses certain problems. Summary of the invention

It is therefore clear that there is a need for a system which, to a large extent, makes it possible to remedy the shortcomings mentioned above which have been encountered in the prior art.

It is an object of the invention to provide an improved sound neutralizing device for a firearm, particularly for a rifle or other long or short firearm.

While a conventional silencer, also called sound moderator, strives to mechanically reduce the latter, the purpose of the present invention is therefore to provide a device for eliminating and completely inhibit the sound produced when a shot is fired. , letting it run out naturally and thus gain in discretion.

Thus, the purpose of the device is to inhibit the sound wave (noise) generated by the ammunition of a firearm.

This object is achieved, according to the invention, in that the sound neutralizing device for a firearm comprises the characteristics of the characterizing part of claim 1.

More particularly, for this purpose, according to the invention, this object is achieved by the fact that a sound neutralizing device of the aforementioned type comprises: - a flap mechanism (10) comprising at least one shutter (10) mounted transversely to the axis on the barrel (42) of the firearm to temporarily close the barrel after the passage of a munition and prevent the passage of the combustion gases and the sound wave towards the mouth of the barrel when a shot is drawn, - an actuating unit (31, 34, 35) having a movable portion (31) disposed axially on the barrel of a firearm for moving a control mechanism (6), the portion movable axially (31) having an internal bore adapted to allow the passage of a munition, - the control mechanism (6) comprising at least one amplitude lever arm (8) pivotally mounted on a pivot (7) fixed at the gun, each lever of amplitude (8) etan is respectively coupled to a closure flap (10), - the movable actuating unit (31,34,35) cooperating with the control mechanism (6) to allow transverse movement of the at least one flap (10) of closing between an open position in which the shutter mechanism (10) ensures the passage of the munition towards the mouth of the barrel (42) and a closed position preventing the passage of the combustion gases and the sound wave after the passage of the ammunition, and - an exhaust unit (11, 21-27) comprising at least one exhaust pipe (11, 21) disposed on the barrel upstream of the shutter mechanism (10) for redirecting and leaving the gases of combustion and the sound wave evacuate out of the barrel.

Thus, to achieve this goal, using the closing shutter mechanism temporarily closes the barrel just after the passage of the projectile and redirects the combustion gases and the sound wave to an expansion tank for its final treatment .

Preferably, in one embodiment of the invention, the actuating unit comprises a movable part (31) of the barrel, moved by the projectile as soon as it has fully passed through the flaps and extended by a rod connected to the ring of the barrel. ordered.

According to the invention, to ensure the motricity of the entire system, makes a small part of the gun movable. This part can be terminal or median.

Preferably, when the projectile passes through the moving part (31), it is pushed axially forward into the part (38) of the barrel downstream by the pressure of the gas inside the barrel. The axial movement of the movable part (31) causes the shutters to close by means of the coupling of the amplitude lever arm (8) to the shutter mechanism (10). In principle, in weapons manufactured directly with the device incorporated the moving part will be median at least on long weapons.

In the case where the movable part is median, it makes the seal with the part of the barrel coming out of the seats of the shutters and the end part of the barrel. The inside of the barrel (in which the projectile moves) is broken down into 3 perfectly aligned parts.

Preferably, the moving part part has a covering part and a recovered part. In its overlapping part, the moving part covers the barrel, and in its recovered part it is covered by the final part of the barrel.

The length of the part of the barrel that passes through the seat of the flaps has in principle a fixed length which is equal to the length of the ball.

In its recovered part the moving part reproduces the part of the barrel that comes out of the shutters and it in turn covered. The final piece of the barrel that is grafted on the seats of the shutters will completely contain the moving part. The final part of the barrel can be very short.

In the case where the mobile part is terminal, this final part forms the mouth of the barrel. It's the same configuration for both guns and chokes.

While the mobile part is preferentially cylindrical and fairly short for shotguns, for mobile weapons the moving part preferably has the shapes, the drawings, and the length of a traditional choke.

Preferably, the control mechanism comprises a guide ring and transmission adapted to slide on the barrel, the ring cooperating with the rod of the movable part of the barrel to transmit the movement to the lever arms.

Preferably, the shutter (s) is / are arranged in a seat placed transversely to the axis of the barrel and of predetermined length and if there are two slightly offset between them along the axis of the barrel, so that in closed position they overlap partially without clashing.

In one embodiment of the invention each flap comprises an opening adapted to receive the end of the amplitude lever arm to transmit the pivoting movement of the amplitude lever and actuate the flap in a transverse direction relative to the axis. cannon

Preferably, the guide ring further comprises two wedge-shaped support pieces having an angled edge surface directed towards the flaps adapted to enable actuation lever arms pivoting on the pivots and closing flaps.

In one embodiment of the invention, the control mechanism comprises at least a first return spring associated with the guide ring so that it returns to its initial position, the pressure of the gases decreasing.

In a preferred embodiment of the invention, the exhaust unit further comprises an expansion vessel connected to said at least one exhaust pipe for receiving the gases conveyed by said at least one exhaust pipe, the vessel expansion chamber with openings to allow the combustion gases to escape from the expansion vessel.

Preferably, the expansion vessel comprises an inner tube connected to flaps adapted to close the openings, and in which the gases enter the expansion vessel through an opening in the inner tube once it has been pushed. at the end of the stroke and thus closed gills and, with the pressure down, the inner tube returns to its initial position thanks to a return spring thus allowing the combustion gases to escape from the expansion vessel through the gills when the sound base has run out naturally.

In a preferred embodiment of the invention, the movable portion of the substantially cylindrical actuating unit joins a portion of the barrel that passes through the seat of the closure flaps and an end portion of the barrel, and has a covering portion and a recovered portion separated by a shoulder, the covering cylindrical portion being adapted to cover the portion of the barrel which passes through the flap seat, and the recovered cylindrical portion being adapted to be covered by the end portion of the barrel.

Preferably, the final part of the barrel comprises a housing comprising a first cylindrical portion adapted to receive the covering portion of the movable part and a second cylindrical portion of smaller diameter adapted to receive the recovered part of the moving part, the first part cylindrical and the second cylindrical portion of the end portion being separated by a shoulder.

Preferably, the first cylindrical portion of the end portion is longer than the cylindrical covering portion of the movable member to allow axial movement of the moving part, the second cylindrical portion of the end portion being substantially the same length as the cylindrical portion recovered. of the moving part.

Preferably, the covering portion of the movable part has an inside diameter corresponding to the outside diameter of the part of the barrel that passes through the seat, and has an outer diameter corresponding to the inside diameter of the first cylindrical portion of the end portion.

In another preferred embodiment of the invention, the movable part of the substantially cylindrical actuating unit forms the end portion of the barrel and has a covering portion and a final portion separated by a shoulder, the cylindrical portion covering the moving part. being adapted to cover a portion of the barrel that passes through the seat of the closure flaps, and the end portion forming the mouth of the barrel.

Preferably, the covering part of the moving part comprises a housing comprising a cylindrical part adapted to receive the cylindrical part of the barrel which passes through the seat of the flaps and to allow the axial movement of the moving part, the cylindrical part of the barrel being substantially of the same length than the cylindrical part covering the moving part.

Preferably, the overlapping portion of the moving part has an inside diameter corresponding to the outside diameter of the part of the barrel that passes through the flap seat.

Preferably, for shotguns, the terminal movable piece at the barrel forms a choke whose internal diameter is reduced in the direction of the mouth of the barrel, the covering cylindrical portion covering the barrel, and the end portion comprising an internal conical portion of a maximum diameter equal to the inner diameter of the barrel and narrowing towards the area of the outlet of the barrel.

In another embodiment of the invention (not shown), a second pair of independent flaps of the first (or a single flap) is located at the exit of the cartridge chamber, can be placed on automatic or semi-automatic weapons. automatic; these shutters mechanically actuated by the own device for ejecting / reloading the weapon are used to prevent the combustion gases, the sound wave and the flash to come out of the breech open during the ejection of the socket. This variant using a second pair of shutters for automatic or semi-automatic weapons can be used by itself for simple modification of a weapon without resorting to the sound inhibitor which, it requires at least the replacement or modification of the barrel.

In another embodiment of the invention, the sound neutralizing device for a firearm, in particular for a rifle or another long or short firearm, comprises: at least one closure flap mounted transversely to the axis on the barrel of the firearm to temporarily close the barrel after the passage of a projectile and prevent the passage of combustion gases and the sound wave towards the mouth of the barrel when a shot is fired, an actuating unit comprising a movable portion of the barrel downstream of the closure flap for moving the control mechanism through the passage of the projectile; the control mechanism comprising at least one amplitude lever arm pivotally mounted on a pivot fixed to the barrel, the amplitude lever arm being coupled to the closure flap, the actuating unit cooperating with the control mechanism to allow transverse movement of the closure flap between an open position in which the flap ensures the passage of a munition towards the mouth of the barrel and a closed position preventing the passage of the combustion gases and the sound wave after the passage of the projectile, and an exhaust unit having at least one exhaust pipe disposed on the barrel upstream of the closure flap to redirect and allow the combustion gases and the sound wave to evacuate out of the barrel.

According to another aspect, the invention proposes a long or short firearm, in particular a rifle, comprising a neutralizing device of the aforementioned type in which the firearm barrel comprises a fastening system formed by said pivots and a seat disposed transversely to the axis of the barrel receiving said shutter mechanism to fix the neutralizing device to the barrel removably. For this purpose, according to another aspect, the invention proposes a method for neutralizing sound for a firearm, in particular for a rifle or another firearm when a shot is fired, the method comprising the steps of: - closing temporarily the barrel after the passage of a projectile and prevent the passage of the combustion gases and the sound wave towards the mouth of the barrel when a shot is fired, by at least one closure flap mounted transversely to the axis on the barrel of the firearm; - moving, by the action of the passage of the projectile in a portion of a moving barrel, a control mechanism; the control mechanism comprising at least one amplitude lever arm pivotally mounted on pivots attached to the barrel, the amplitude lever arm being coupled respectively to a closure flap, generating, by means of the unit; actuating mechanism and the control mechanism, a transverse movement of the closure flap between an open position in which the flap ensures the passage of a projectile towards the mouth of the barrel and a closed position preventing the passage of combustion gases and the sound wave after the passage of the projectile, and - redirect and let the combustion gases and sound melt escape from the barrel by means of an exhaust unit comprising at least one exhaust pipe disposed on the barrel upstream shutter mechanism.

Thus, to achieve this goal, using one or more shutters is temporarily closed the barrel just after the passage of the projectile and redirects the combustion gases and the sound wave to an expansion tank for its final treatment.

Sound waves during a shot

There are in principle 3 sound waves that are generated by a shot. Two occur inside the barrel, and the last outside. Inside the barrel, the first sound wave is that produced by the combustion of the explosive charge. The second is the famous "bang" produced by the projectile when crossing the sound barrier, which is the case for about 96% of ammunition. This "bang" occurring inside the barrel, is not certain but supposed, but it is certain however that it never intervenes outside the barrel. In the human ear, these two sound waves are perceived as a single sound. The third occurs at the exit of the barrel projectile, like a lash in the air. It has an intensity of 72 to 80 db and can in no way be controlled.

The combustion of the powder gives off an immediate heat of 2500 to 3000 degrees Celsius, as well as 2 - 2.5 grams of gas which, uncompressed, give a volume of about 1.12 m3. The sound wave produced by the combustion and the bang, moves (at this temperature) to about 1500-1800m / s, immediate speed, while the projectile is still in phase of acceleration, this one not reaching its speed maximum after about 60 cm of stroke.

According to the invention, the sound wave has three properties that interest us: the first is that, when it encounters an obstacle, it bounces (echo phenomenon), the second is that it does not spread in the empty, and the third and more interesting for the sound neutralizing device of the present invention is that it has an ephemeral life. One can not store in any way a sound wave: by preventing it from spreading it disappears. The sound wave does not stick to the projectile, hitting it bounces back to the breech which in turn sends it back to the projectile. It then follows incessant comings and goings between these two obstacles until the exit of the projectile by the muzzle of the gun, with a variable speed, dependent on the temperature of the medium in which it evolves and that of the gases which convey it . At the exit of the barrel the sound wave then propagates in the air.

While a conventional muffler of the aforementioned type, also called sound moderator, strives to mechanically reduce the latter, the sound inhibitor of the present invention, by retaining the sound a very short instant inside the barrel, let it run out naturally and get rid of it completely.

In addition, the firearm sound suppressing device of the present invention has the advantage of weight (about 50 grams in total), cost of manufacture, and efficiency. According to the invention, the sound wave produced inside the barrel is completely annihilated, because retained behind the (s) flap (s).

There remains only the noise produced by the sound wave generated outside the barrel.

In fact, the firearm sound suppressing device of the present invention allows the sound wave to naturally destroy itself and deals primarily with the pressure generated by the gases. If there were no escapement provided by an exhaust pipe, the gases would remain compressed inside the barrel holding the shutter (s) closed. They would relax only at the opening of the rifle, without danger but with some inconvenience.

According to the invention, it has been found preferable to increase, by one or two exhaust pipes, the interior volume of the barrel. This extra volume lowers the throttle pressure and allows the shutter (s) to open through the return spring system and lets the gases naturally escape to the front and end of the engine. Exhaust temporarily closed by flaps of dimension similar to those placed on the barrel. The pressure drop of gas inside the barrel is also caused by their rapid cooling.

BRIEF DESCRIPTION OF THE FIGURES Other features and advantages of the invention will appear on reading the detailed description which follows. Also, to allow a clearer understanding of the invention will be described below, several preferred embodiments, for example, with particular reference to the figures in the appendix, among which: - Figure 1 illustrates a sound reduction device for a firearm in one embodiment of the invention; FIG. 2 is a partial side view in section of the device as shown in FIG. 1; FIG. 3 is a side view before assembly of the device such as 4 shows a partial side view of the part 38 of the device as shown in FIG. 1; FIG. 5 represents a partial side view in section of the part 38 of the device as represented. FIG. FIG. 6 shows a partial side view of the device as shown in FIG. 1; FIG. 7 shows a partial side view of the FIG. As shown in FIG. 1, FIG. 8 illustrates a gun sound neutralizing device in another embodiment of the invention; FIG. 9 is a partial sectional side view of the device as shown in FIG. FIG. 10 shows a partial sectional side view of the device as shown in FIG. 8; FIG. 11 illustrates a gun sound neutralization device in another embodiment of the invention; FIG. 12 is a partial side view of the device as shown in FIG. 11, FIG. 13 is a side view of an exhaust unit of the firearm sound suppressor in one embodiment of the invention.

Embodiments of the invention

The present invention is described with particular embodiments and references to figures but the invention is not limited by them. The drawings or figures described are only schematic and are not limiting.

FIG. 1 illustrates a sound neutralizing device for a firearm in one embodiment of the invention.

According to the preferred embodiment illustrated in FIG. 1, two shutters (10) for closing are mounted transversely to the axis on the barrel of the weapon to temporarily seal the barrel after the passage of a projectile and to prevent the passage of gases. of combustion and sonic sound to the mouth of the barrel (42) when a shot is fired. the shutters (10) are arranged in a seat (37) placed transversely to the axis of the barrel and are of predetermined length and slightly offset between them along the axis of the barrel, so that in the closed position they overlap partially without clashing.

The control mechanism (6) comprises two amplitude lever arms (8) mounted on pivots (7) to allow transverse movement of the two shutters (10) closing between an open position in which the flaps (10) ensure the passage of a projectile towards the mouth of the barrel and a closed position preventing the passage of the combustion gases and the sound wave after the passage of the projectile. The exhaust unit (11) has two exhaust pipes (11) arranged upstream of the shutters (10) to redirect and allow the combustion gases and the sound wave to escape from the barrel (42). .

The control mechanism (6) is positioned upstream of the flaps (10).

The control mechanism (6) actuates the arms of amplitude levers (8) which close the flaps (10), thus allowing the gases to escape through the pipes (11). The flaps (10) (and their seat 37) are placed transversely to the axis of the barrel (42) and are of predetermined length and slightly offset between them according to the axis of the barrel, so that in the closed position they overlap partially without s 'clash.

Advantageously, each flap (10) has an opening adapted to receive the end of the amplitude lever arm (8) to transmit the pivoting movement of the amplitude lever (8) and actuate the flap (10) in one direction. transverse to the axis of the barrel (42). The element (6) of the actuating mechanism is set in motion in a direction generally parallel to the axis of the barrel (42).

Preferably, the control mechanism (6) comprises a guide ring (6) adapted to slide on the barrel and connected to the rod of the movable portion of the barrel (31) to transmit the movement to the lever arms (8).

Advantageously, as can be seen for example in Figures 1 and 2, the guide ring (6) further comprises two base pieces disposed laterally to the axis of the barrel (42) each forming an elongated opening for receiving the end one of the lever arms (8) and having an angled (rectilinear or curvilinear) guiding surface directed towards the flaps (10) adapted to enable the lever arms (8) to be pivotally actuated on the pivots (7). ) to close and open the shutters (10).

Alternatively, in a non-illustrated embodiment, the guide ring (6) comprises two wedge-shaped base pieces arranged laterally to the axis of the barrel (42) and having an angled edge surface (rectilinear or curvilinear) directed to the flaps (10) adapted to enable the lever arms (8) to pivot on the pivots (7) to close and open the flaps (10).

The passage of the projectile in the movable portion of the barrel (31) pushes the latter forward thus pulling, by means of the rod, the ring (6) by transmitting the movement, which allows this ring to operate the arms of lever (8) on the pivots (7) which close the flaps (10), the gases being thus deflected towards the exhaust (11).

All the mechanism can be protected by a bonnet for common use and avoid damage in use with a firearm, but it will depend on the weapon and its components. Since the hood is not essential for proper operation, it is not described in detail.

The two flaps (10) close the barrel after the passage of the ball, so that the sound wave and gases are redirected to an expansion tank. A second pair of flaps can be used to close the barrel at the base in case of automatic or semi-automatic weapons. The control ring (6) is actuated by the passage of the projectile after the flaps in a small portion (31) of gun which is movable and connected to the control ring (6) by a rod. This portion (31) of the barrel (of the same caliber as the latter) is placed after the flaps (10) at a distance from them equal to the length of the body of the projectile (without its possible tip). This piece (31) is movable and moves about 0.5mm, which serves to close the flaps (10) immediately after the passage of the ball. The proportion of the amplitude levers depends on the caliber of the weapon, the maximum being 10 for a 12-caliber single-barrel or superimposed, 20 for a 12-gauge juxtaposed (lateral), because for this weapon we are obliged to have only one component (10). The repositioning in the normal position of the parts (31,6, 8 and 10) is provided by a return spring (32).

As can be seen in Figure 2, the control mechanism (6) comprises a transmission rod and the movable portion (31) has a coupling assembly (34-36) for moving the control ring (6). The coupling assembly (34-36) comprises a connecting arm (34) fixed to the movable part (31) by a connecting screw (35) and secured to the transmission rod by a bolt and nut (36). As can be seen in more detail in FIGS. 6 and 7 which are partial side views of the device as shown in FIG. 1, the elongated opening in the transmission rod allows axial adjustment of the position of the rod. relative to the connecting arm (34) and to the movable part (31) by tightening the nut (36).

The transmission rod is positioned in a direction generally parallel to the axis of the barrel defining the direction of the projectile. When the projectile passes at a defined point, the movable part (31) is axially actuated and allows the transmission of the movement to the control mechanism (6) by coupling to the coupling assembly (34-36) and to the transmission rod .

The control mechanism (6) with the rod is associated with a return spring (32) disposed on a fixing anchor (33) to the barrel. The axial force on the piece (31) decreasing, the rod and the control mechanism (6) returns to its initial position with the return spring (32).

Specials

In this version, one can either have the device incorporated in the weapon to its manufacture, be added to an existing weapon in extensions of the cannon as they exist, or in extension of the cannon after a shortening of these . The addition is done either by screwing, welding, nesting or by any other means. 1. Device incorporated in the weapon:

In the case where the device is incorporated in the weapon, as can be seen in Figures 1 to 3, the piece (31), in extension of the barrel, is movable, its beginning being located after the flaps (10) to a exact distance corresponding to the length of the body of the projectile. The projectile through it prints an axial movement that actuates the entire device and causes the complete and immediate closure of the flaps (10). The gases and the sound wave are thus deflected by the exhaust (11) for their treatment. The projectile continues its course in the part (38) of the weapon, which is the extension of the gun.

The axial force produced on the part (31) by the projectile being far superior to the needs of the device can be reduced by either judiciously increasing the diameter of said part (31) which is in principle of the same caliber as the barrel, or by adding a spring (not shown) around the right part of the piece (31) that enters the piece (38), or both. Note that the piece (31) does not hit the end piece (38) that receives it.

As shown in Figure 3, the moving part (31) is median to the barrel. This movable part (31) makes the seal with the portion of the barrel (42) coming out of the seats (37) of the flaps (10) and the end portion (38) of the barrel. This movable piece (31) is cylindrical and has an inner bore adapted to allow the passage of a ball. The inside of the barrel in which the projectile moves is decomposed into 3 parts (42,31, 38) which must be perfectly aligned.

The cylindrical movable piece (31) has a covering portion and a recovered portion separated by a shoulder.

In its cylindrical covering part, the movable part (31) covers the barrel (42), and in its recovered cylindrical part it is covered by the final part (38) of the barrel.

The length of the portion of the barrel (42) which passes through the seat (37) of the flaps (10) has a fixed length which is equal to the length of a bullet for this type of weapon. If the part of the piece (31) instead of covering was covered, it could then move back inside the part (42) and thus prevent the flaps (10) to close properly.

In its recovered part, the part (31) reproduces the part (42) coming out of the shutters (10) and it in turn covered. The piece (38) which is grafted on the seats (37) of the flaps (10) will contain the piece (31) in its entirety (Figures 2 and 5).

As shown in Figures 2 and 5, the end portion (38) of the barrel comprises a housing having a first cylindrical portion adapted to receive the covering portion of the movable member (31) and a second cylindrical portion of a smaller diameter adapted to receive the recovered portion of the moving part (31). The first cylindrical portion and the second cylindrical portion of the final portion (38) are separated by a shoulder.

The first cylindrical portion of the end portion (38) is longer than the overlying cylindrical portion of the movable member (31) to allow axial movement of the movable member (31). The second cylindrical portion of the end portion (38) may be of the same length as the recovered cylindrical portion of the movable member (31). The final part (38) of the barrel can be very short.

The overlapping portion of the movable member (31) has an inner diameter corresponding to the outer diameter of the portion of the barrel (42) which passes through the seat (37), and has an outer diameter corresponding to the inside diameter of the first cylindrical portion of the final part (38).

The recovered portion of the movable member (31) has an inner diameter corresponding to the inside diameter of the portion of the barrel (42) which passes through the seat (37), and has an outer diameter corresponding to the inside diameter of the second cylindrical portion of the final part (38).

As can be seen in Figure 3, the assembly can in particular be done so that the device (31,37,38) is incorporated in the weapon to its manufacture. The seat (37) flaps (10) is attached to the portion 38 of the weapon, which is the extension of the barrel. The right part of the movable piece (31) is inserted between the seat (37) and the piece 38. The connecting arm (34) and the piece (35) are added to the piece 31 after assembly.

As can be seen in Figures 4 and 5, the part (38) of the device as shown in Figure 1 forms the end portion (38) of the barrel and comprises a portion provided for assembly to the seat (37) flaps (10) and to receive the moving part (31). For example, in the case of a 30-caliber Blaser carbine, with particular reference to FIGS. 1 to 3, the specific dimensions recommended for the device incorporated in the weapon can be as follows:

Rifle caliber 30 Blaser - Diameter of the projectile: 7.85 mm - Internal diameter of the top barrel of the grooves: 7.6 mm - Outer diameter of the barrel 15 mm - Ball body length (without the pointed part): 20 mm

Barrel part (42) coming out of the seat flaps (37) - Length: 20 mm - Internal diameter 7.6 mm - Outside diameter: 10 mm - Mobile part (31) - Total length 24 mm

Covering part: - Length: 20 mm - Outside diameter: 12 mm - Inside diameter: 10.2 mm

Part covered: - Length: 4 mm - Outside diameter: 10.2 mm - Inside diameter: 7.6 mm

Part 38 - Outer diameter: 15 mm (indifferent length) - Inner diameter first part: 12.2 mm by 23 mm length (the piece 31 will thus have a 3 mm beat) - Internal diameter second part: 10.2 mm out of 4 mm in length - Inner diameter final part: 7.6 mm to the end 2. Device added to existing weapons:

In the case where the device is added to the existing weapons it is necessary to make a difference between the guns and the shotguns.

Indeed, on the guns the caliber of the gun is the same on all its length whereas on the majority of shotguns the gun ends with a narrowing called choke, of different dimensions according to the desired performance.

On shotguns it is well known that when firing a cartridge, the impact of the lead has a certain dispersion which increases proportionally to the distance at which the impact takes place. This dispersion can be influenced by the use of what is called a choke. In particular, various types of chokes or chokes to be mounted on the rifle barrels to reduce their output diameter, so as to increase the range of fire and limit the spray of shots projected.

It is therefore clear that, on the one hand, it is necessary to keep on these weapons the possibility of choosing the appropriate choke, and on the other hand there will be, if one uses only one final part, an increase of the axial force on this room.

So, for guns, we use the configuration as in Figures 8 and 9. While for shotguns, we use the configuration of Figure 10. This version provides moving parts (31) interchangeable with appropriate chokes. The alternative for shotguns is to use a mini-piece (38) at the outer end of which is screwed a choke (Figure 10) of the aforementioned type forming a constriction or narrowing to mount on the barrel to reduce the diameter of exit, so as to increase the range of the shot and to limit the projected spray shot.

Figures 8, 12 and 9 (exploded) show a movable part (31) mounted in the final part of the barrel. It's the same configuration for both bullets and chokes. While for ballguns, the part (31) will be cylindrical and quite short, for shotguns the part (31) will have the shapes, configurations, and length of a traditional choke (Figure 10).

As shown in FIGS. 8 and 9, the movable piece (31) terminates at the barrel. This movable piece (31) is mounted on the portion of the barrel (42) out of the seats (37) of the flaps (10). This movable piece (31) is cylindrical and has an inner bore adapted to allow the passage of a ball. The inside of the barrel in which the projectile moves is decomposed into two parts (42,31) which must be perfectly aligned.

The cylindrical movable piece (31) has a covering portion and a final portion separated by a shoulder.

In its cylindrical covering part, the movable part (31) covers the barrel (42), and in its final cylindrical part it forms the mouth of the barrel.

In its final part, the part (31) reproduces the part (42) coming out of the flaps (10) .The piece (31) is grafted on the portion (42) coming out of the flaps (10) (Figure 9).

As shown in FIG. 9, the covering part of the movable part (31) comprises a housing comprising a cylindrical part adapted to receive the cylindrical part of the final part (42) of the barrel and allow the axial movement of the moving part (31). . The cylindrical portion of the end portion (42) may be of the same length as the cylindrical covering portion of the movable member (31). The final part (38) of the barrel can be very short.

The overlapping portion of the movable piece (31) has an inside diameter corresponding to the outside diameter of the portion of the barrel (42) which passes through the seat (37). By way of example, in the case of a Blaser 30 caliber rifle, with particular reference to FIGS. 8 and 9, the specific dimensions recommended for the device added to the existing weapon can be as follows:

Rifle caliber 30 Blaser - Diameter of the projectile: 7.85 mm - Internal diameter of the top barrel of the grooves: 7.6 mm - Outer diameter of the barrel 15 mm - Ball body length (without the pointed part): 20 mm

Barrel part (42) coming out of the seat flaps (37) - Length: 20 mm - Inside diameter 7.6 mm - Outside diameter: 10 mm

Moving part (31) - Total length 24 mm - Outside diameter 15 mm

Covering part: - Length: 20 mm - Internal diameter: 10.2 mm

Final part: - Length: 4 mm. - Inner diameter: 7.6 mm

As shown in Figure 10, the movable piece (31) is barrel-ended and forms a choke used in particular for shotguns, the choke forming a passage for the lead, which extends in the barrel extension and whose the internal diameter is reduced towards the mouth of the barrel. As can be seen in Figure 10, the cylindrical movable piece (31) has a covering portion and a final portion separated by a shoulder.

In its cylindrical covering part, the movable part (31) covers the barrel (42), and in its final part forming the mouth of the barrel it comprises a conical portion having a maximum diameter equal to the inner diameter of the barrel and narrowing towards the zone of the outlet.

As shown in FIG. 11, for all the embodiments, it is possible to reinforce the resistance of the part (31) to the axial movement with return springs (40) interposed between a component (41) of the part (31) and a rod (39) fixed to the seat (37) of the flaps (10) to allow the piece (31) resists axial movement and returns to its original position. The version of Figure 11 is similar to Figures 8,12,9 and shows a reinforced version of the portion (31) in the end position.

It should be noted that the bullet length of the shotguns is approximately the length of the flock. This is based on the ammunition used and the length of the rifle chamber. The length of the latter is 68mm (almost obsolete), 70mm, 76mm and 82mm.

It goes without saying that a longer chamber can use shorter sockets, the opposite being in principle impossible and not recommended. The length of a skirt flock for a 70mm ammunition is about 40mm. Part 6 provides adjustment for adaptation.

Improper use of ammunition, or malfunction of the device can cause damage. In our tests, the use of 2mm thick aluminum shutters gave excellent results. Aluminum shutters intentionally left closed during the shooting were crossed by the projectiles, even in shot, without consequence.

As can be seen in FIG. 13, according to a preferred embodiment of the invention, an expansion vessel with timer (22-27) is associated with the exhaust pipes (21) for the treatment of recovered gases and inhibition of the sound wave. Other solutions are possible.

According to the embodiment illustrated in FIG. 13, the expansion vessel (27) is coupled to the exhaust pipes (21) and has an internal axis (23) which is moved by the pressure of the gases to redirect these gases. The expansion vessel 27 receives the gases conveyed by the recovery pipes (21) which penetrate into the expansion tank 27 through the opening (22) made on the shaft (23) once this has been pushed at the end of the race and thus closing the openings (24). A pressure relief valve (25) is present (but could be replaced by small holes). With the pressure down, the axis returns to its initial position thanks to the return spring (26) and the gases are evacuated through the gills (24).

Mode of operation and details

The final goal of the device achieved by the invention described here is the inhibition of the sound wave produced by the firing of the ammunition (shotgun).

This shutter for the inhibition of sound background produced by the firing of the ammunition (shotgun) prevents the release of combustion gases and sound waves by muzzle of the gun by deflecting them to a suitable treatment area, while leaving intact the prerogatives specific to ammunition (speed, precision).

Principle a) a sound wave has an ephemeral life; (b) it can not be retained; c) it is stopped by any obstacle (in which case it bounces-sound box), whether it is motionless or moving; d) it does not spread in a vacuum;

In a shot 2 sound waves are normally generated inside the barrel and only once each: 1) The detonation produced by the blast; 2) The typical "bang" of the wall of sound when it is exceeded;

The sound waves follow the projectile; although the speed of sound in gaseous medium is variable (it can reach very high values depending in particular on the temperature of the gases), the sound wave does not stick to the projectile inside the barrel; if its velocity is greater than that of the projectile, there is back-and-forth of this wave inside the barrel. The speed of the projectile can vary between 250 and 950m / s according to caliber and type of ammunition.

Enforcement: It is admitted that the maximum velocity of a projectile is reached after 60 cm of stroke is practiced, after this distance, an opening of adequate dimensions to redirect the gas and is incorporated in the barrel, just after this opening, a transverse rail with a left flap and a right flap (or lower and upper) each intended to close the transverse half of the barrel by superposition. Both shutters are operated by an amplitude lever. The lever (s) of each shutter is implemented by a control set in motion by the passage of the projectile which pushes forward a moving part of the barrel.

This is valid for so-called long weapons; for short weapons the position of the device will be chosen accordingly.

The mechanism is preferably composed of: i) A mechanical or hydraulic shut-off valve with 1 shutter (solid or articulated) or, preferably with two shutters juxtapose (2 halves overlapping, better solution because faster), with diaphragm (like shutter photo), with cleaver; spring return; (ii) Control device and kinetic motricity by the thrust of the projectile; (iii) a tight expansion vessel; iv) Possibly a stand-alone device for resetting;

The flap valve (a flap or double flap) will close the barrel just after the passage of the projectile after it has traveled between 0.5 and 1mm after the flaps, this distance being freely chosen by the amplitude coefficient applied to the levers .

The tests carried out successfully are: A) neutralization of the gases in the expansion vessel; B) closing the barrel after passing the projectile by means of a shutter valve; In summary we will have: i) a flap or 2 shutters opposite on 2 axes slightly offset, to avoid the interlocking; ii) control device (kinetic kinetics by projectile thrust) with spring return; m) amplitude lever mechanisms on each side; iv) opening (s) to redirect the gases;

All dimensions of the components shall be defined according to the caliber of the weapon and the maximum projectile length, if any, of the sharp point before shoulder; the total amplitude factor developed by the levers will be defined according to the caliber;

The residual noise is that caused by the projectile whipping the air.

According to the invention, the motricity of the device is ensured only by the passage of the ball in the piece (31) which is movable (displacement of the order of a millimeter max.).

In all firearms the section of the barrel is very slightly smaller than the caliber of the bullet, this to ensure a lateral seal so as to make the most of the pressure of the gases. So the ball, traveling from left to right in relation to the drawings - eg. Fig. 2) as soon as it has crossed its entire length the level of the flaps (10), enters the moving part of the barrel (31) imparting an axial movement forward. The moving part (31) actuates the control ring (6) which, by moving also from left to right, closes the shutter (s) (10) by means of the lever arms (8). The gases and the sound wave are thus deflected by the exhaust (s) (11). Parts (31, 6, 8 and 10) return to the initial position by means of the return spring (32).

According to the invention, either the device is incorporated in the barrel during its manufacture (in which case the device is well before the mouth of the barrel, and thus one adds a barrel end after the piece (31), or the piece 38 ) - illustrated by the drawings (Fig.2) or then we append the device at the end of the barrel on the mouth side (Fig. 8) in extension of the existing or in place of a part of the existing, after the have shortened accordingly. This addition can be done by several methods: brazing, screwing, bayonet etc).

Moreover, the proportion of arms of amplitude depends directly on the caliber of the weapon: 1 to 4 for an 8 mm (bullet), 1 to 10 for a 12 gauge (shot), and will therefore be fixed.

Gas treatment and sound wave

The closure mechanism consists of lever arms (8) actuated by a piece (6) whose shape can be variable.

Once the projectile passed at the height of the shutters, they close directly behind and the gases are directed towards one or two exhaust pipes leading to an expansion tank with timer. The gases conveyed by the recovery pipes (21) penetrate into the expansion vessel through the opening (22) made on the shaft (23) once it has been pushed to the end of stroke and thus closed the openings (24). A pressure relief valve (25) is present (but could be replaced by small holes). With the pressure down, the axis returns to its initial position thanks to the spring (26) and the gases are evacuated by the gills. Sequence of operation

Once fully and barely crossed the open flaps, the projectile enters a moving part of the barrel (31) pushing it forward. The rod of this portion (31) being connected to the ring (6) pulls it forward which has the effect of actuating the lever arms (8) on the pivots (7) which will close the flaps (10). , the gases being thus deflected towards the exhaust (11), and then treated in the expansion tank (27).

According to a preferred embodiment of the invention for a long firearm, it is therefore appropriate to:

Make exhaust openings after 60 centimeters of travel on which will be grafted the tight expansion tank and of adequate size to contain the combustion gases; this expansion vessel (27) may be of any shape and made of any material, solid or elastic; it can be applied anywhere on the weapon (eg laterally on the barrel or below)

J

Just downstream of these openings there will be a flap support (10) incorporated in the barrel during its manufacturing process or modification thereof;

The shutter device will be operated by linkage.

The setting in motion of the entire device will be controlled by the thrust that the projectile exerts on the moving part of the barrel (31).

The amplitude coefficient will be calculated according to the caliber so that the shutters close immediately after the passage of the projectile allowing it to advance less than one millimeter.

Nomenclature No. Description of parts 6 Control ring 7 pivots 8 lever arms 10 flaps 11 exhaust pipes 31 moving part 32 return spring 33 spring anchorage 34 rod or connecting arm 35 Connecting screw 36 bolt and nut 37 seats flaps 38 final part with barrel 39 reinforcement rod 40 retention spring 41 anchor reinforcement 42 barrel 21 junction evacuation 22 opening on shaft 23 axis and flaps 24 openings vase 25 overpressure valve 26 spring return 27 expansion vessel

Final considerations

All pieces, their shape and their positions can vary to infinity. The recovery pipes or exhaust can be reduced to one and not necessarily tubular, the expansion vessel be of different shape, the control 6 represented by a complete circular ring could be in a circular arc, etc.

The present invention is in no way limited to the embodiment described by way of example and shown in the figures. Many modifications of details, shapes, and dimensions can be made without departing from the scope of the invention. The present invention has been described in relation to specific embodiments, which have a purely illustrative value and should not be considered as limiting. The reference numerals in the claims do not limit their scope.

Claims (20)

A sound neutralizing device for a firearm, in particular for a rifle or other long or short firearm, comprising: a flap mechanism (10) comprising at least one closure flap (10) mounted transversely to the axis on the barrel (42) of the firearm to temporarily close the barrel after the passage of a munition and prevent the passage of the combustion gases and the sound wave towards the mouth of the barrel when a shot is fired, a actuating unit (31,34,35) comprising a movable part (31) arranged axially on the barrel of a firearm to set in motion a control mechanism (6), the axially movable part (31) having a bore interior adapted to allow passage of a munition, the control mechanism (6) comprising at least one amplitude lever arm (8) pivotally mounted on a pivot (7) fixed to the barrel, each lever arm of amplitude (8) being respectively coupled to a flap (10) closure, the movable actuating unit (31,34,35) cooperating with the control mechanism (6) to allow transverse movement of the at least one closure flap (10) between an open position in which the mechanism flap (10) ensures the passage of the munition towards the mouth of the barrel (42) and a closed position preventing the passage of the combustion gases and the sound wave after the passage of the munition, and an exhaust unit (11). , 21-27) comprising at least one exhaust pipe (11, 21) disposed on the barrel upstream of the shutter mechanism (10) for redirecting and allowing the combustion gases and the sound wave to escape cannon A sound neutralizing device according to claim 1, wherein the movable portion (31) of the actuating unit (31,34,35) is substantially cylindrical (31) and is adapted to be inserted into a housing at a distance of the interior of the barrel, the movable portion (31) forming the inner bore of the movable portion (31) having a diameter substantially equal to the inner diameter of the barrel (42) to allow passage of the ammunition. The sound canceling device according to claim 1 or 2, wherein the control mechanism (6) comprises a transmission rod and the movable portion (31) has a coupling assembly (34-36) coupled to the transmission rod. for moving the control mechanism (6) in a direction generally parallel to the axis of the barrel (42). 4. Neutralizing device according to any one of the preceding claims, wherein the control mechanism (6) comprises a ring (6) for guiding and transmitting adapted to slide on the barrel, the ring (6) cooperating with the rod and the movable portion (31) for transmitting the movement to the lever arm (8). 5. A sound neutralizing device according to any one of the preceding claims, wherein the flap mechanism (10) comprises two shutters (10) closure (10) disposed in a seat (37) placed transversely to the axis of the barrel and which are of predetermined length and slightly offset between them along the axis of the barrel (42), so that in the closed position they overlap partially without clashing. 6. A sound neutralizing device according to any one of the preceding claims, wherein the flap mechanism (10) comprises two shutters (10) closure (10), each flap (10) has an opening adapted to receive the end an amplitude lever arm (8) for transmitting the pivotal movement of the amplitude lever (8) and actuating the flap (10) in a direction transverse to the barrel axis. 7. A sound canceling device according to any one of the preceding claims, wherein the flap mechanism (10) comprises two shutters (10) for closing (10) and the ring (6) for guiding further comprises two basic parts disposed laterally to the axis of the barrel each forming an elongate opening for receiving the end of one of the lever arms (8) and allowing to actuate the lever arms (8) pivotally on the pivots (7) to close and open the shutters (10). 8. sound neutralizing device according to any one of the preceding claims, wherein the control mechanism (6) comprises at least a first return spring (32) associated with the guide ring (6) so that it finds its initial position, the pressure of the gases decreasing. Sound-canceling device according to any one of the preceding claims, in which the exhaust unit (11, 21-27) further comprises an expansion tank (27) connected to said at least one exhaust pipe ( 11, 21) for receiving the gases conveyed by said at least one exhaust pipe (11, 21), the expansion tank (27) having openings (24) for leaving the combustion gases and the sound wave evacuate from the expansion tank (27). 10. sound neutralizing device according to claim 9, wherein the expansion tank (27) comprises an inner tube (23) connected to flaps adapted to close the openings (24), and wherein the gases enter the vase (27) by an opening (22) made in the inner tube (23) once it has been pushed to the end of the stroke and thus closed gills (24) and, the lowering pressure, the tube internal (23) returns to its initial position through a return spring (26) thus leaving the combustion gases and the sound wave evacuate from the expansion vessel (27) through the openings (24). Sound canceling device according to any of the preceding claims, wherein the movable portion (31) of the substantially cylindrical actuating unit (31,34,35) (31) joins a portion of the barrel (42). which passes through the seat (37) of the shutter mechanism (10) and an end portion (38) of the barrel, and comprises a covering portion and a recovered portion separated by a shoulder, the covering cylindrical portion being adapted to cover the portion the barrel (42) which passes through the seat (37) of the flap mechanism (10), and the recovered cylindrical portion being adapted to be covered by the end portion (38) of the barrel. 12. sound-neutralizing device according to claim 11, wherein the final portion (38) of the barrel comprises a housing having a first cylindrical portion adapted to receive the covering portion of the movable piece (31) and a second cylindrical portion of a smaller diameter adapted to receive the recovered portion of the movable part (31), the first cylindrical portion and the second cylindrical portion of the end portion (38) being separated by a shoulder. The sound canceling device according to claim 12, wherein the first cylindrical portion of the end portion (38) is longer than the overlying cylindrical portion of the movable member (31) for permitting axial movement of the movable member (31). ), the second cylindrical portion of the end portion (38) being substantially the same length as the recovered cylindrical portion of the movable member (31). The sound canceling device according to one of claims 12 or 13, wherein the overlapping portion of the movable piece (31) has an inside diameter corresponding to the outside diameter of the portion of the barrel (42) which passes through the seat (37). ), and has an outer diameter corresponding to the inside diameter of the first cylindrical portion of the end portion (38). 15. sound neutralizing device according to any one of claims 1 to 10, wherein the movable portion (31) of the substantially cylindrical actuating unit (31, 34, 35) (31) forms the end portion of the barrel. and has a covering portion and a final portion separated by a shoulder, the cylindrical covering portion of the movable piece (31) being adapted to cover a portion of the barrel (42) which passes through the seat (37) of the shutter mechanism ( 10), and the end part forming the mouth of the barrel. Sound-canceling device according to claim 15, wherein the overlapping portion of the movable piece (31) comprises a housing having a cylindrical portion adapted to receive the cylindrical portion of the barrel (42) which passes through the seat (37) of the mechanism flap (10) and allow the axial movement of the movable piece (31), the cylindrical portion of the barrel (42) being substantially the same length as the cylindrical portion covering the movable piece (31). The sound canceling device according to one of claims 15 or 16, wherein the overlapping portion of the movable piece (31) has an inside diameter corresponding to the outside diameter of the portion of the barrel (42) which passes through the seat (37). ) of the shutter mechanism (10). 18. sound neutralizing device according to one of claims 15 to 17, wherein the movable piece (31) terminal barrel forms a choke whose inner diameter is reduced in the direction of the mouth of the barrel, the cylindrical covering portion covering the gun (42), and the end portion having an internal conical portion of a maximum diameter equal to the inner diameter of the barrel and narrowing towards the area of the barrel outlet. 19. A long or short firearm, in particular a rifle, comprising a sound-canceling device according to any one of the preceding claims, wherein the firearm barrel comprises a fastening system formed by said pivots (7). ) and a seat (37) disposed transversely to the axis of the barrel receiving said shutter mechanism (10) for securing neutralizing device to the barrel. 20. Method of neutralizing sound for a firearm, in particular for a rifle or other long or short firearm when a shot is fired, the method comprising the steps of: temporarily closing the barrel after the passage of a munition and preventing the passage of combustion gases and the sound wave towards the mouth of the barrel (42) when a shot is fired, by a shutter mechanism (10) comprising at least one shutter (10) mounted transversely to the axis on the barrel of Γ firearm, set in motion an actuating unit (31) and a control mechanism (6), by the thrust of a munition passing through a movable part (31) of Γ an actuating unit (31) arranged axially on the barrel of a firearm, the axially movable part (31) having an internal bore adapted to allow the passage of a munition, the control mechanism (6) comprising at least one amplitude lever arm (8) pivotally mounted t on a pivot (7) fixed to the barrel, each amplitude lever arm (8) being respectively coupled to a closure flap (10), generating, by means of the actuating unit (31) and the mechanism control device (6), a transverse movement of said at least one shutter (10) between an open position in which the shutter mechanism (10) ensures the passage of a munition towards the mouth of the barrel (42) and a position closed preventing the passage of combustion gases and the sound wave after the passage of the munition, and redirect and allow the combustion gases and the sound wave to escape out of the barrel by means of an exhaust unit ( 11, 21-27) comprising at least one exhaust pipe (11, 21) disposed on the barrel (42) upstream of the shutter mechanism (10).