EP3504501B1 - Silencer device for firearm - Google Patents

Description

The present invention relates to a sound neutralizer device for a firearm, in particular a rifle or other long or short firearm, and a sound neutralization method for a firearm.

Technical area

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

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

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

Indication of the state of the prior art :

Regarding the state of the prior art, there is the conventional silencer which can be added to a firearm, gas or air, also called a sound moderator, which attempts to mechanically reduce the latter.

For example, the publication WO 96/03612 reveals a sound moderating device for Ball Trap rifles or recreation with superimposed barrels of all calibers. This firearm silencer consisting of a tubular body mounted on the gun barrel and comprising an annular expansion chamber behind said tubular body, as well as a series of internal transverse baffles supported by spacers and provided with openings allowing passage lead shot and fluff. The silencer is intended to dampen noise and thus reduce noise pollution.

The publications WO 2011/035111 A1 and WO 2014/000805 reveal other examples of silencer for firearm, in particular for automatic rifle or other long firearm, comprising a silencer mounted on the Parma barrel, a muzzle brake, which can be screwed to the silencer, being fixed on the barrel.

DE2238834 A relates to a sound neutralizer device for a firearm, in particular a rifle or other long or short firearm and a method of sound neutralization for a firearm.

Classic silencer

A classic silencer or sound 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, and thus gain stealth .

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 the gases used to propel the gun to be relaxed. projectile, in order to attenuate as much as possible their release into the atmosphere.

As the silencer only slows down the gas at the exit of the barrel, it does not interfere with the noise caused by the passage of the projectile in supersonic speed (speed greater than that of sound which is about 340 m / s in the air at 15 ° C) which, by passing the sound barrier, itself produces a detonation noise on its path. The phenomenon is especially noticeable on high initial speed calibers such as the 5.56 mm. For certain calibers of cartridges, notably for handguns, there is subsonic ammunition created specifically for use with a silencer, in order to minimize the noise of the shot.

A silencer is primarily a tool of comfort, as 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, which the usual means cannot protect (earplugs, shooting helmets, etc.).

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, the compressibility of which is about 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 larger 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 liquid (which is often considered incompressible) .

For example, sound propagates at exactly 1,482.343 m / s in pure water at 20 ° C, approximately 340 m / s in air at 15 ° C, and about 1,500 m / s in sea water. .

The effectiveness of the silencers is relative: the sound reducer suppresses the muzzle wave and consequently the consequent detonation and makes the sound more diffuse while suppressing the flame at the muzzle of the weapon. The term sound moderator is sometimes used; the performance of this type of device is very variable, depending on the type of reducer used by its employee and the Parma used. The shot is heard less far, it is also more difficult to identify as a gunshot as well as more difficult to locate both because of the distortion of the sound and the absence of visible flame. The reduction in noise intensity is of the order of 25 to 35 db in the case of an assault rifle, or 115 to 125 db (comparable to a jackhammer) instead of 150 db. The classic silencers, while being able to have different shapes and techniques, are despite everything quite similar to each other.They are generally sleeves that Pon fixes, either by a bayonet system or by a threaded screw thread, at the end of the barrel.

These sleeves, of a substantial size, have inside several gas expansion chambers which make it possible to attenuate the noise of the detonation with varying degrees of success. The projectile, the gases and the residual sound wave exit through the muzzle.

Their faults are: heavy weight (several hundred grams, or even more than a kilo), large dimensions, imbalance of the weapon (it stings the nose), inability to use it in double-barreled weapons as well as the Most of the time, with shot ammunition.

In addition, the diameter of the holes separating the various elements of the silencer through which the projectiles pass being much larger than the caliber, they allow part of the gases to escape towards the front of the projectile, thus disturbing the precision of the projectile and reducing its speed. 'about 4 to 6 m / s.

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

The projectile passing the various baffles lets the gases behind it relax in the alveoli and thereby reduce the intensity of the sound wave.

The effectiveness of such a silencer lies in two factors: its dimensions (the larger it is, the more it dampens), and the distance between it and the combustion chamber (the further it is, the more efficient 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 also have virtually no effect if used with very short barreled weapons, unless it is greatly oversized.

On this type of silencer, the noise reduction depends on the size of the chambers (cells). The noise normally produced by a firearm detonation is of the order of 120 to 170 db. Sudden noise or prolonged exposure to too high a sound environment (over 100 db) can cause temporary or permanent hearing impairment.

In addition, implementation difficulties also arise in particular for certain conventional silencers or which are not efficient 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, overcomes the above mentioned shortcomings which have been encountered in the prior art.

An object of the invention is to provide an improved sound neutralizer device for a firearm, in particular a rifle or other long or short firearm.

While a conventional silencer, also called a sound moderator, strives to mechanically reduce the latter, the aim of the present invention is therefore to provide a device making it possible to eliminate and completely inhibit the sound produced when a shot is fired. , by letting it run out in a natural way 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 objective is achieved, according to the invention, in that the sound neutralizer device for a firearm comprises the characteristics of the characterizing part of claim 1.

• un mécanisme à volet (10) comprenant au moins un volet (10) de fermeture monté transversalement à l'axe sur le canon (42) de l'arme à feu pour obturer temporairement le canon après le passage d'une munition et empêcher le passage des gaz de combustion et de l'onde sonore vers la bouche du canon lorsqu'un coup est tiré,
• une unité d'actionnement (31,34,35) comportant une partie mobile (31) disposée axialement sur le canon de l'arme à feu pour mettre en mouvement un mécanisme de commande (6), la partie mobile axialement (31) comportant un perçage intérieur adapté pour permettre le passage d'une munition,
• le mécanisme de commande (6) comportant au moins un bras de levier d'amplitude (8) monté à pivotement sur un pivot (7) fixé au canon, chaque bras de levier d'amplitude (8) étant accouplé respectivement à un volet (10) de fermeture,
• l'unité d'actionnement mobile (31,34,35) coopérant avec le mécanisme de commande (6) pour permettre un mouvement transversal dudit au moins un volet (10) de fermeture entre une position ouverte dans laquelle le mécanisme à volet (10) assure le passage de la munition vers la bouche du canon (42) et une position fermée empêchant le passage des gaz de combustion et de l'onde sonore après le passage de la munition, et
• une unité d'échappement (11, 21-27) comportant au moins un tuyau d'échappement (11, 21) disposé sur le canon en amont du mécanisme à volet (10) de fermeture pour rediriger et laisser les gaz de combustion et l'onde sonore s'évacuer hors du canon.

More particularly, for this purpose, in accordance with the invention, this object is achieved by the fact that a sound neutralizer device of the aforementioned type comprises:

• a shutter mechanism (10) comprising at least one closing 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 muzzle when a shot is fired,
• an actuation unit (31,34,35) comprising a movable part (31) disposed axially on the barrel of the firearm to set in motion a control mechanism (6), the axially movable part (31) comprising 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 respectively coupled to a shutter ( 10) closing,
• the movable actuating unit (31,34,35) cooperating with the control mechanism (6) to allow transverse movement of said at least one closing shutter (10) between an open position in which the shutter mechanism (10 ) ensures the passage of the ammunition towards the muzzle (42) and a closed position preventing the passage of 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 closing to redirect and leave the combustion gases and the sound wave escape out of the barrel.

Thus, to achieve this goal, using the closing shutter mechanism, the barrel is temporarily closed just after the passage of the projectile and the combustion gases and the sound wave are redirected to an expansion vessel for its final treatment. .

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

According to the invention, to ensure the traction of the entire system, a small part of the barrel is made mobile. This part can be terminal or middle. Preferably, when the projectile passes through the moving part (31), it is pushed axially forward in the part (38) of the downstream barrel by the pressure of the gases 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) for closing. In principle, in guns manufactured directly with the device incorporated, the moving part will be median at least on long guns.

In the case where the moving part is median, it forms the seal with the part of the barrel emerging from the seats of the flaps 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 movable part part has a covering part and a covered part. In its covering part, the moving part covers the barrel, and in its covered part it is covered by the final part of the barrel.
The length of the part of the barrel which passes through the seat of the flaps has in principle a fixed length which is equal to the length of the bullet.

In its covered part, the moving part reproduces the part of the barrel which comes out of the shutters and it in turn is covered. The final part of the barrel which is grafted onto the seats of the shutters will entirely 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 muzzle of the barrel. It is the same configuration for both bullet guns and chokes. While for bullet guns the mobile part is preferably cylindrical and quite short, for shotguns the mobile part preferably has the shapes, designs and length of a traditional choke.

Preferably, the control mechanism comprises a guide and transmission ring 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 closing flap (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 from each other along the axis of the barrel, so that in the closed position they partially overlap without colliding.

In one embodiment of the invention, each shutter has an opening adapted to receive the end of the amplitude lever arm to transmit the pivoting movement of the amplitude lever and to actuate the shutter in a direction transverse to the axis. of the barrel.

Preferably, the guide ring further comprises two wedge-shaped support pieces comprising an angled edge surface directed towards the flaps adapted to allow actuation of the lever arms in pivoting on the pivots and the closing of the 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 gas pressure 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 vents allowing combustion gases to escape from the expansion vessel.

Preferably, the expansion vessel comprises an internal tube connected to flaps adapted to close the openings, and in which the gases enter the expansion vessel through an opening made in the internal tube once the latter has been pushed. at the end of the stroke and thus blocked the vents and, with the pressure lowering, the inner tube returns to its initial position thanks to a return spring, thus allowing the combustion gases to escape out of the expansion tank through the vents when sound melts exhausted herself naturally.

In a preferred embodiment of the invention, the movable part of the substantially cylindrical actuating unit joins a part of the barrel which passes through the seat of the closing flaps and an end part of the barrel, and comprises a covering part and a covered part. separated by a shoulder, the covering cylindrical part being adapted to cover the part of the barrel which passes through the seat of the flaps, and the covered cylindrical part being adapted to be covered by the end part of the barrel.

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

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

Preferably, the covering part of the moving part has an inside diameter corresponding to the outside diameter of the part of the barrel which passes through the seat, and has an outside diameter corresponding to the inside diameter of the first cylindrical part of the end part.

In another preferred embodiment of the invention, the movable part of the substantially cylindrical actuating unit forms the end part of the barrel and comprises a covering part and a final part separated by a shoulder, the covering cylindrical part of the movable part. being adapted to cover a part of the barrel which passes through the seat of the closing flaps, and the end part forming the muzzle 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 allow the axial movement of the movable part, the cylindrical part of the barrel being substantially of the same length as the covering cylindrical part of the movable part.

Preferably, the covering part of the moving part has an inside diameter corresponding to the outside diameter of the part of the barrel which passes through the seat of the flaps.

Preferably, for shotguns, the terminal movable part to the barrel forms a choke, the internal diameter of which is reduced towards the muzzle of the barrel, the covering cylindrical part covering the barrel, and the end part comprising an internal conical part of a maximum diameter equal to the internal 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 shutters independent of the first (or a single shutter), is located at the outlet of the cartridge chamber, can be placed on automatic or semi-automatic weapons. automatic; these flaps, which are mechanically actuated by the weapon's own ejection / reloading device, serve to prevent combustion gases, sound and the flash from exiting through the open breech when the cartridge is ejected. This variant using a second pair of shutters for automatic or semi-automatic weapons can be used alone for simple modification of a weapon without resorting to the sound inhibitor which, for its part, requires at least the replacement or modification of the barrel.

• au moins un volet de fermeture monté transversalement à l'axe sur le canon de l'arme à feu pour obturer temporairement le canon après le passage d'un projectile et empêcher le passage des gaz de combustion et de l'onde sonore vers la bouche du canon lorsqu'un coup est tiré,
• une unité d'actionnement comportant une partie mobile du canon en aval du volet de fermeture pour mettre en mouvement par le passage du projectile le mécanisme de commande ;
• le mécanisme de commande comportant au moins un bras de levier d'amplitude monté à pivotement sur un pivot fixé au canon, le bras de levier d'amplitude étant accouplé au volet de fermeture, l'unité d'actionnement coopérant avec le mécanisme de commande pour permettre un mouvement transversal du volet de fermeture entre une position ouverte dans laquelle le volet assure le passage d'une munition vers la bouche du canon et une position fermée empêchant le passage des gaz de combustion et de l'onde sonore après le passage du projectile, et une unité d'échappement comportant au moins un tuyau d'échappement disposé sur le canon en amont du volet de fermeture pour rediriger et laisser les gaz de combustion et l'onde sonore s'évacuer hors du canon.

In another embodiment of the invention, the sound neutralizer device for a firearm, in particular for a rifle or another long or short firearm, comprises:

• at least one closing 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 muzzle of the barrel when a shot is fired,
• an actuating unit comprising a movable part of the barrel downstream of the closing flap to set the control mechanism in motion by the passage of the projectile;
• the control mechanism comprising at least one amplitude lever arm mounted to pivot on a pivot fixed to the barrel, the amplitude lever arm being coupled to the closing flap, the actuating unit cooperating with the control mechanism to allow transverse movement of the closing flap between an open position in which the flap ensures the passage of an ammunition towards the muzzle of the barrel and a closed position preventing the passage of combustion gases and of the sound wave after the passage of the projectile, and an exhaust unit comprising at least one exhaust pipe disposed on the barrel upstream of the closing flap to redirect and allow the combustion gases and the sound wave to escape out of the barrel.

According to another aspect, the invention provides a long or short firearm, in particular a rifle, comprising a neutralizer device of the aforementioned type in which the barrel of the firearm comprises a fixing system formed by said pivots and a seat arranged transversely to the axis of the barrel receiving said closing flap mechanism to fix the neutralizer device to the barrel in a removable manner.

• obturer temporairement le canon après le passage d'un projectile et empêcher le passage des gaz de combustion et de l'onde sonore vers la bouche du canon lorsqu'un coup est tiré, par au moins un volet de fermeture monté transversalement à l'axe sur le canon de l'arme à feu,
• mettre en mouvement, par l'action du passage du projectile dans une portion de canon mobile un mécanisme de commande ;
• le mécanisme de commande comportant au moins un bras de levier d'amplitude monté à pivotement sur des pivots fixés au canon, le bras de levier d'amplitude étant accouplé respectivement à un volet de fermeture,
• générer, au moyen de l'unité d'actionnement et du mécanisme de commande, un mouvement transversal du volet de fermeture entre une position ouverte dans laquelle le volet assure le passage d'un projectile vers la bouche du canon et une position fermée empêchant le passage des gaz de combustion et de l'onde sonore après le passage du projectile, et
• rediriger et laisser les gaz de combustion et Ponde sonore s'évacuer hors du canon au moyen d'une unité d'échappement comportant au moins un tuyau d'échappement disposé sur le canon en amont du mécanisme à volet.

To this end, according to another aspect, the invention proposes a method of neutralizing the sound for a firearm, in particular for a rifle or another firearm when a shot is fired, the method comprising the steps of:

• temporarily block the barrel after the passage of a projectile and prevent the passage of combustion gases and the sound wave towards the muzzle of the barrel when a shot is fired, by at least one closing flap mounted transversely to the axis on the barrel of the firearm,
• set in motion, by the action of the passage of the projectile through a portion of the movable barrel, a control mechanism;
• the control mechanism comprising at least one amplitude lever arm pivotally mounted on pivots fixed to the barrel, the amplitude lever arm being respectively coupled to a closing flap,
• generate, by means of the actuating unit and the control mechanism, a transverse movement of the closing shutter between an open position in which the shutter ensures the passage of a projectile towards the muzzle of the barrel and a closed position preventing the passage of combustion gases and the sound wave after the passage of the projectile, and
• redirecting and allowing the combustion gases and the sound probe to escape out of the barrel by means of an exhaust unit comprising at least one exhaust pipe arranged on the barrel upstream of the shutter mechanism.

Thus, to achieve this goal, using one or more shutters, the barrel is temporarily closed off just after the projectile has passed and the combustion gases and the sound wave are redirected to an expansion vessel for its final treatment.

Sound waves during a gunshot

There are in principle 3 sound waves which are generated by a gunshot. Two occur inside the barrel, and the last one 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 approximately 96% of ammunition. This "bang" occurring inside the barrel, is not certain but supposed, but it is on the other hand certain that it never occurs outside the barrel. To the human ear, these two sound waves are perceived as a single sound. The third occurs at the exit of the projectile from the barrel, like a whip in the air. This has an intensity of 72 to 80 db and can in no way be controlled.

The combustion of the powder releases an immediate heat of 2500 to 3000 degrees Celsius, as well as 2 - 2.5 grams of gas which, uncompressed, gives a volume of approximately 1.12 m3.

The sound wave produced by the combustion and the bang, moves (at this temperature) at about 1500-1800m / s, immediate speed, while the projectile is still in acceleration phase, it does not reach its speed maximum only after about 60 cm of travel.

According to the invention, the sound wave has three properties which interest us: the first is that, when it encounters an obstacle, it bounces (echo phenomenon), the second is that it does not propagate in the empty, and the third and more interesting for the sound neutralizer device of the present invention is that it has a fleeting life. We cannot store a sound wave in any way: by preventing it from spreading it disappears.

The sound wave does not stick to the projectile. By striking it it bounces back towards the breech which in turn sends it forward towards the projectile. It then follows incessant back and forth between these two obstacles until the projectile exits through the muzzle of the barrel, at a variable speed, depending on the temperature of the medium in which it operates 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 silencer of the aforementioned type, also called a sound moderator, tries to mechanically reduce the latter, the sound inhibitor of the present invention, by retaining the sound for a very short time inside the barrel, leaves it to exhaust itself completely in a natural way and manages to eliminate it completely.

Further, the firearm sound neutralizer 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 it is retained behind the shutter (s).

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

In fact, the firearm sound neutralizer device of the present invention allows the sound wave to destroy itself naturally and mostly deals with the pressure generated by the gases. If there was no exhaust provided by an exhaust pipe, the gases would remain compressed inside the barrel, keeping the shutter (s) closed. They would relax only when the gun was opened, safe but with some inconvenience.

According to the invention, it has been judged preferable to increase, by one or two exhaust pipes, the internal volume of the barrel. This additional volume lowers the gas pressure and allows the shutter (s) to open by the system of recoil springs and allows the gases to escape naturally forward and through the end of the escapement temporarily closed by shutters similar in size to those placed on the barrel. The drop in gas pressure inside the barrel is also caused by their rapid cooling.

Brief description of the figures

• la figure 1 illustre un dispositif neutralisateur de son pour arme à feu dans une réalisation de l'invention,
• la figure 2 représente une vue latérale partielle en coupe du dispositif tel que représenté dans la figure 1,
• la figure 3 représente une vue latérale avant assemblage du dispositif tel que représenté dans la figure 1,
• la figure 4 représente une vue latérale partielle de la pièce 38 du dispositif tel que représenté dans la figure 1,
• la figure 5 représente une vue latérale partielle en coupe de la pièce 38 du dispositif tel que représenté dans la figure 1,
• la figure 6 représente une vue latérale partielle du dispositif tel que représenté dans la figure 1,
• la figure 7 représente une vue latérale partielle du dispositif tel que représenté dans la figure 1,
• la figure 8 illustre un dispositif neutralisateur de son pour arme à feu dans une autre réalisation de l'invention,
• la figure 9 représente une vue latérale partielle en coupe du dispositif tel que, représenté dans la figure 8,
• la figure 10 représente une vue latérale partielle en coupe du dispositif tel que représenté dans la figure 8,
• la figure 11 illustre un dispositif neutralisateur de son pour arme à feu dans une autre réalisation de l'invention,
• la figure 12 représente une vue latérale partielle du dispositif tel que représenté dans la figure 11,
• la figure 13 représente une vue latérale d'une unité d'échappement du dispositif neutralisateur de son pour arme à feu dans une réalisation de l'invention.

Other characteristics and advantages of the invention will become apparent on reading the detailed description which follows. Also, in order to allow a clearer understanding of the invention, several preferred embodiments will be described below, by way of example, with particular reference to the appended figures, among which:

• the figure 1 illustrates a sound neutralizer device for a firearm in one embodiment of the invention,
• the figure 2 shows a partial sectional side view of the device as shown in figure 1 ,
• the figure 3 shows a side view before assembly of the device as shown in figure 1 ,
• the figure 4 shows a partial side view of part 38 of the device as shown in figure 1 ,
• the figure 5 shows a partial sectional side view of part 38 of the device as shown in figure 1 ,
• the figure 6 shows a partial side view of the device as shown in figure 1 ,
• the figure 7 shows a partial side view of the device as shown in figure 1 ,
• the figure 8 illustrates a sound neutralizer device for a firearm in another embodiment of the invention,
• the figure 9 shows a partial sectional side view of the device as shown in figure 8 ,
• the figure 10 shows a partial sectional side view of the device as shown in figure 8 ,
• the figure 11 illustrates a sound neutralizer device for a firearm in another embodiment of the invention,
• the figure 12 shows a partial side view of the device as shown in figure 11 ,
• the figure 13 shows a side view of an exhaust unit of the sound neutralizer device for a firearm 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.
The figure 1 illustrates a sound neutralizer device for a firearm in one embodiment of the invention.
According to the preferred embodiment illustrated in figure 1 , two closing shutters (10) are mounted transversely to the axis on the barrel of the weapon to temporarily close the barrel after the passage of a projectile and prevent the passage of combustion gases and sound probe towards the muzzle of the gun. barrel (42) when a shot is fired.

The closing flaps (10) are arranged in a seat (37) placed transversely to the axis of the barrel and are of predetermined length and slightly offset from one another along the axis of the barrel, so that in the closed position they partially overlap. without clashing.

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

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

The control mechanism (6) operates the amplitude lever arms (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 from one another along the axis of the barrel, so that in the closed position they partially overlap 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 a 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 part 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 arranged laterally to the axis of the barrel (42) each forming an elongated opening to receive the end of one of the lever arms (8) and comprising a surface angle guide (rectilinear or curvilinear) directed towards the shutters (10) adapted to allow actuation of the lever arms (8) in pivoting 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 comprising an angled ridge surface (rectilinear or curvilinear) directed towards the shutters (10) adapted to allow actuation of the lever arms (8) in pivoting on the pivots (7) to close and open the shutters (10).

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

The whole mechanism can be protected by a cover for current use and to prevent damage in use with a firearm, but it will depend on the weapon and its components. Since the cover is not essential for proper operation, it is not described in further detail.

The two flaps (10) close the barrel after the bullet has passed, so that the sound wave and the gases are redirected to an expansion vessel. 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 the barrel which is movable and connected to the control ring (6) by a rod. This part (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 point). This part (31) is mobile 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 juxtaposed 12 caliber (lateral), because for this weapon we are obliged to have a single shutter (10). The repositioning to 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 part (31) comprises a coupling assembly (34-36) for setting the control ring (6) in motion. All coupling (34-36) comprises a connection arm (34) fixed to the movable part (31) by a connection screw (35) and secured to the transmission rod by a bolt and nut (36).

As can be seen in more detail in figures 6 and 7 which are partial side views of the device as shown in figure 1 , the elongated opening made in the transmission rod allows the axial adjustment of the position of the rod relative to the connection 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 actuated axially 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) arranged on a fixing anchor (33) to the barrel. The axial force on the part (31) falling, the rod and the control mechanism (6) return to their initial position thanks to the return spring (32).

Particularities

In this version, we can either have the device incorporated into the weapon during its manufacture, or added to an existing weapon as an extension of the barrel (s) as they exist, or as an extension of the barrel (s) after a shortening of the latter. . The addition is done either by screwing, welding, interlocking 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 part (31), as an extension of the barrel, is mobile, its beginning being located after the flaps (10) at an exact distance corresponding to the length of the body of the projectile. The projectile passing through it gives it an axial movement which activates the entire device and causes the complete and immediate closing of the shutters (10). The gases and the sound wave are therefore diverted 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 barrel.
The axial force produced on the part (31) by the projectile being far greater than the needs of the device, it can be reduced either by judiciously increasing the diameter of said part (31) which is in principle of the same caliber as the barrel, either by adding a spring (not shown) around the right part of the part (31) which goes into the part (38), or both.
Note that the part (31) does not hit the part (38) which receives it at the end.

As shown in the Figure 3 , the moving part (31) is median to the barrel. This movable part (31) forms the seal with the part of the barrel (42) coming out of the seats (37) of the flaps (10) and the end part (38) of the barrel. This movable part (31) is cylindrical and has an internal bore adapted to allow the passage of a ball. The interior of the barrel in which the projectile moves is divided into 3 parts (42,31, 38) which must be perfectly aligned.
The cylindrical movable part (31) comprises a covering part and a covered part separated by a shoulder.
In its covering cylindrical part, the movable part (31) covers the barrel (42), and in its covered cylindrical part it is covered by the final part (38) of the barrel.
The length of the part 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 part (31) instead of being covered were covered, then it could move back inside the part (42) and thus prevent the shutters (10) from closing properly.

In its covered part, the part (31) reproduces the part (42) which comes out of the shutters (10) and it in turn is covered. The part (38) which is grafted onto the seats (37) of the shutters (10) will contain the part (31) in its entirety ( figures 2 and 5 ).

As shown by Figures 2 and 5 , the final part (38) of the barrel comprises a housing comprising a first cylindrical part adapted to receive the part covering of the movable part (31) and a second cylindrical part of a smaller diameter adapted to receive the covered part of the movable part (31). The first cylindrical part and the second cylindrical part of the final part (38) are separated by a shoulder.

The first cylindrical part of the final part (38) is longer than the covering cylindrical part of the movable part (31) to allow axial movement of the movable part (31). The second cylindrical part of the final part (38) can be of the same length as the covered cylindrical part of the movable part (31). The final part (38) of the barrel can be very short.

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

The covered part of the movable part (31) has an inside diameter corresponding to the inside diameter of the part of the barrel (42) which passes through the seat (37), and has an outside diameter corresponding to the inside diameter of the second cylindrical part of the cylinder. 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 into the weapon during its manufacture.
The seat (37) of the flaps (10) is fixed to part 38 of the weapon, which is the extension of the barrel. The straight part of the moving part (31) is inserted between the seat (37) and the part 38. The connecting arm (34) and the part (35) are added to the part 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 part (38) of the barrel and comprises a part provided for the assembly to the seat (37) of the flaps (10) and to receive the moving part (31).

By way of example, in the case of a 30 caliber Blaser rifle, with particular reference to the figures 1 to 3 , the specific dimensions recommended for the device incorporated into the weapon can be as follows:

Blaser 30 caliber rifle

• Projectile diameter: 7.85 mm
• Internal diameter of the barrel top of the grooves: 7.6 mm
• External diameter of the barrel 15 mm
• Ball body length (without the pointed part): 20 mm

Part of the barrel (42) which comes out of the shutters seat (37)

• Length: 20mm
• Internal diameter 7.6 mm
• External diameter: 10 mm

- Moving part (31)

• Total length 24 mm

Covering part:

• Length: 20mm
• Outside diameter: 12 mm
• Inner diameter: 10.2 mm

Covered part:

• Length: 4mm
• Outer diameter: 10.2 mm
• Inner diameter: 7.6 mm

Part 38

• External diameter: 15 mm (any length)
• Internal diameter first part: 12.2 mm by 23 mm in length (part 31 will thus have 3 mm of beating)
• Second part internal diameter: 10.2 mm over 4 mm long
• Internal diameter final part: 7.6 mm to the end

2. Device added to existing weapons:

In the event that the device is added to existing weapons, a distinction must be made between bullet weapons and shotguns.

In fact, on bullet guns the caliber of the barrel is the same over its entire length, while on most shotguns the barrel ends in a narrowing called choke, of different dimensions depending on the desired performance.

On shotguns it is well known that when firing a cartridge, the impact of the lead exhibits a certain dispersion which increases in proportion 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 rifle barrels in order to reduce their outlet diameter, so as to increase the range of the shot and to limit the spray of pellets projected.

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

So, for the bullet weapons we use the configuration as on the Figures 8 and 9 . While for shotguns, the configuration of the Figure 10 . This version provides for movable parts (31) which are interchangeable with suitable chokes.

The alternative for shotguns is to use a mini-part (38) at the outer end of which we will screw a choke ( Figure 10 ) of the aforementioned type forming a constriction or constriction to be mounted on the barrel to reduce the outlet diameter, so as to increase the range of the shot and to limit the spray of shot.

The Figures 8 , 12 and 9 (exploded view) show a moving part (31) mounted in the final part of the barrel. It is the same configuration for the balls as for the chokes. While for bullet guns part (31) will be cylindrical and quite short, for shotguns part (31) will have the shapes, configurations, and length of a traditional choke ( figure 10 ).

As shown by Figures 8 and 9 , the movable part (31) is terminal to the barrel. This movable part (31) is mounted on the part of the barrel (42) coming out of the seats (37) of the flaps (10). This mobile part (31) is cylindrical and has a bore interior adapted to allow the passage of a ball. The interior of the barrel in which the projectile moves is divided into two parts (42,31) which must be perfectly aligned.
The cylindrical movable part (31) comprises a covering part and a final part separated by a shoulder.
In its covering cylindrical part, the movable part (31) covers the barrel (42), and in its final cylindrical part it forms the muzzle of the barrel.

In its final part, the part (31) reproduces the part (42) which comes out of the shutters (10). The part (31) is grafted onto the part (42) which comes out of the shutters (10) ( figure 9 ).

As shown in the Figure 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 movable part (31). The cylindrical part of the final part (42) can be of the same length as the covering cylindrical part of the movable part (31). The final part (38) of the barrel can be very short.

The covering part of the movable part (31) has an inside diameter corresponding to the outside diameter of the part of the barrel (42) which passes through the seat (37).

By way of example, in the case of a 30 caliber Blaser rifle, with particular reference to the figures 8 and 9 , the specific dimensions recommended for the device added to the existing weapon may be as follows:

Blaser 30 caliber rifle

• Projectile diameter: 7.85 mm
• Internal diameter of the barrel top of the grooves: 7.6 mm
• External diameter of the barrel 15 mm
• Ball body length (without the pointed part): 20 mm

Part of the barrel (42) which comes out of the shutters seat (37)

• Length: 20mm
• Internal diameter 7.6 mm
• External diameter: 10 mm

Moving part (31)

• Total length 24 mm
• External diameter 15 mm

Covering part:

• Length: 20mm
• Inner diameter: 10.2 mm

Final part:

• Length: 4 mm.
• Inner diameter: 7.6 mm

As shown in the Figure 10 , the mobile part (31) is terminal to the barrel and forms a choke used in particular for shotguns, the choke forming a passage for the lead, which extends in the extension of the barrel and whose internal diameter is reduced to direction of the muzzle. As can be seen in Figure 10 , the cylindrical movable part (31) comprises a covering part and a final part separated by a shoulder.

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

As shown in the Figure 11 , for all the embodiments, the resistance of the part (31) to axial movement can be reinforced with return springs (40) interposed between an element (41) of the part (31) and a rod (39) fixed to the seat (37) of the flaps (10) to allow the part (31) to resist axial movement and regain its initial position. The version of the figure 11 is similar to Figures 8 , 12 , 9 and presents a reinforced version of the part (31) in the final position.

Note that the bullet length of shotguns roughly matches the length of the wad. This depends on the ammunition used and the length of the gun 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 not possible and not recommended. The length of a skirted wad for a 70mm ammunition is approximately 40mm. Part 6 provides an adjustment for adaptation.

Incorrect use of ammunition, or a malfunction of the device can create damage. In our tests, the use of 2mm thick aluminum shutters gave excellent results. Aluminum shutters intentionally left closed during firing were passed through by projectiles, even shot, without consequence.

As can be seen in figure 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 the recovered gases and the inhibition of the sound wave. Other solutions are possible.

According to the embodiment illustrated in figure 13 , the expansion tank (27) is coupled to the exhaust pipes (21) and comprises an internal axis (23) driven by the gas pressure to redirect these gases. The expansion vessel 27 receives the gases conveyed by the recovery pipes (21) which enter the expansion vessel 20 27 through the opening (22) made on the axis (23) once the latter has been pushed to the end of the stroke and thus have closed the openings (24). A pressure relief valve (25) is present (but could be replaced by small holes). As the pressure drops, the axis returns to its initial position thanks to the return spring (26) and the gases are discharged through the vents (24).

Operation mode and details

The final aim of the device achieved by the invention described here is the inhibition of the sound wave produced by the firing of the ammunition (rifle shot).
This shutter intended to inhibit the sound wave produced by the firing of the ammunition (gun shot) prevents the escape of combustion gases and sound waves through the muzzle by deflecting them towards a treatment area adequate, while leaving intact the prerogatives specific to ammunition (speed, precision).

Principle

1. a) une onde sonore a une durée de vie éphémère ;
2. b) elle ne peut être conservée ;
3. c) elle est arrêtée par un obstacle quelconque (auquel cas elle rebondit- caisse de résonance), que celui-ci soit immobile ou en mouvement;
4. d) elle ne se propage pas dans le vide;

Lors d'un tir 2 ondes sonores sont en principe générées à l'intérieur du canon et une seule fois chacune:

1. 1) La détonation produite par la déflagration ;
2. 2) Le « bang » typique du mur du son lorsque celui est dépassé ;

Les ondes sonores suivent le projectile; bien que la vitesse du son en milieu gazeux soit variable (elle peu atteindre des valeurs très élevées en fonction notamment de la température des gaz), l'onde sonore ne colle pas au projectile à l'intérieur du canon ; si sa vitesse est supérieure à celle du projectile, il se produit des va-et-vient de cette onde à l'intérieur du canon. La vitesse du projectile peut varier entre 250 et 950m/s selon calibre et type de munition.

1. a) a sound wave has an ephemeral lifetime;
2. b) it cannot be kept;
3. c) it is stopped by any obstacle (in which case it bounces - resonance box), whether it is stationary or in motion;
4. d) it does not propagate in a vacuum;

During a shot 2 sound waves are in principle generated inside the barrel and only once each:

1. 1) The detonation produced by the deflagration;
2. 2) The typical “bang” of the sound barrier when it is exceeded;

Sound waves follow the projectile; although the speed of sound in a 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 speed is greater than that of the projectile, this wave moves back and forth inside the barrel. The speed of the projectile can vary between 250 and 950m / s depending on the caliber and type of ammunition.

Implementation :

Given that the maximum speed of a projectile is reached after 60 cm of travel, after this distance, an opening of adequate dimensions to redirect the gases is made and a transverse rail is incorporated into the barrel, just after this opening. with a left flap and a right flap (or lower and upper) each intended to close off the transverse half of the barrel by superposition. The 2 flaps are actuated by an amplitude lever. The lever (s) of each flap is operated by a control set in motion by the passage of the projectile which pushes forward a movable part of the barrel.

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

1. i) D'une soupape de fermeture mécanique ou hydraulique a 1 volet (solide ou articulé) ou, de préférence à 2 volets juxtaposes (2 moitiés se recouvrant, meilleure solution car plus rapide), a diaphragme (genre obturateur photo), à couperet; rappel par ressort;
2. ii) Dispositif de commande et motricité cinétique par la poussée du projectile
3. iii) Un vase d'expansion étanche ;
4. iv) Eventuellement d'un dispositif autonome pour la réinitialisation ;

La soupape à volet (un volet ou double volet) va fermer le canon juste après le passage du projectile après que celui-ci aura parcouru entre 0.5 et 1mm après les volets, cette distance étant librement choisie par le coefficient d'amplitude appliqué aux leviers.The mechanism preferably consists of:

1. i) A mechanical or hydraulic closing valve with 1 shutter (solid or articulated) or, preferably with 2 juxtaposed shutters (2 halves overlapping, better solution because faster), with diaphragm (like shutter photo), with cleaver ; spring return;
2. ii) Control device and kinetic traction by projectile thrust
3. iii) A sealed expansion vessel;
4. iv) Possibly a stand-alone device for the reset;

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

1. A) neutralisation des gaz dans le vase d'expansion ;
2. B) fermeture du canon après passage du projectile au moyen d'une soupape à volet ;

En résumé on aura:

• i) un volet ou 2 volets de fermeture opposés sur 2 axes légèrement décalés, pour éviter l'entrechoquage ;
• ii) dispositif de commande (motricité cinétique par poussée du projectile) avec rappel par ressort ;
• m) mécanismes de levier d'amplitude de chaque coté ;
• iv) ouverture(s) pour rediriger les gaz ;

Toutes les cotes des composants doivent être définies en fonction du calibre de l'arme et de la longueur maximale du projectile diminuée, s'il y a lieu, de la partie pointue avant épaulement ;
le facteur total d'amplitude développé par les leviers sera défini en fonction du calibre ;
Le bruit résiduel est celui provoqué par le projectile fouettant l'air.The successful tests are:

1. A) neutralization of gases in the expansion vessel;
2. B) closing of the barrel after passage of the projectile by means of a shutter valve;

In summary we will have:

• i) a shutter or 2 opposite closing shutters on 2 slightly offset axes, to avoid colliding;
• ii) control device (kinetic traction by thrust of the projectile) with spring return;
• m) amplitude lever mechanisms on each side;
• iv) opening (s) to redirect gas;

All the dimensions of the components must be defined according to the caliber of the weapon and the maximum length of the projectile reduced, if necessary, by the pointed part before the shoulder;
the total amplitude factor developed by the levers will be defined according to the caliber;
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 part (31) which is mobile (displacement of the order of a maximum of one millimeter).

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 best use of the gas pressure. So the ball, traveling from left to right in relation to the drawings - eg. Fig. 2 ) as soon as it has crossed the level of the flaps (10) to its full length, enters the movable part of the barrel (31) giving it an axial forward movement. The moving part (31) actuates the control ring (6) which, also moving 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). The parts (31, 6, 8 and 10) return to the initial position thanks to the return spring (32).

According to the invention, either the device is incorporated into the barrel during its manufacture (in which case the device is located well before the muzzle of the barrel, and therefore an end of the barrel is added after part (31), or part 38 ) - illustrated by the drawings ( Fig. 2 ) or the device is added to the end of the barrel on the muzzle side ( Fig. 8 ) as an extension of the existing or in place of part of the existing, after having shortened it accordingly. This addition can be done according to several methods: brazing, screwing, bayonet, etc.).

Moreover the proportion of the amplitude arms depends directly on the caliber of the weapon: 1 to 4 for an 8 mm (bullet), 1 to 1 0 for a caliber 1 2 (shot), and will therefore be fixed.

Gas and sound wave treatment

The closing mechanism consists of lever arms (8) actuated by a part (6) whose shape can be variable.
Once the projectile has passed level with the flaps, they close directly behind and the gases are directed to one or two exhaust pipes leading to an expansion tank with timer. The gases conveyed by the recovery pipes (21) enter the expansion vessel through the opening (22) made on the shaft (23) once the latter has been pushed to the end of its travel and thus closed. the openings (24). A pressure relief valve (25) is present (but could be replaced by small holes). As the pressure drops, the axis returns to its initial position thanks to the spring (26) and the gases are discharged through the vents.

Sequence of operation

Once completely and barely passed the open shutters, the projectile enters a movable part of the barrel (31) by pushing it forward. The rod of this part (31) being connected to the ring (6) pulls the latter forward which has the consequence of actuating the lever arms (8) on the pins (7) which will close the shutters (10) , the gases being thus diverted to the exhaust (11), and then treated in the expansion vessel (27).

According to a preferred embodiment of the invention for a long firearm, it is therefore necessary to:
Make exhaust openings after 60 centimeters of travel to which the sealed expansion tank will be grafted and of adequate size to contain the combustion gases; this expansion vessel (27) can have any shape and is made from any material, solid or elastic; it can be applied anywhere on the weapon (for example laterally on the barrel or below);

Just downstream of these openings there will be a flap support (10) incorporated into the barrel during its manufacturing process or its modification; The shutter device will be actuated by linkage.

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

The amplitude coefficient will be calculated according to the caliber so that the flaps close immediately after the passage of the projectile, letting it advance by less than a millimeter.

Nomenclature Part designation

6

Command ring

7

pivots

8

lever arms

10

shutters

10 11

drain pipes

31

moving part

32

spring return

33

spring anchor

34

connecting rod or arm

15 35

Connection screw

36

bolt and nut

37

shutters seats

38

final part with cannon

39

reinforcement rod

20 40

retention spring

41

anchor reinforcement

42

cannon

21

evacuation junction

22

opening on axis

25 23

axis and flaps

24

vase openings

25

pressure relief valve

26

spring return

27

expansion vessel

Final considerations

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

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

Claims (20)

1. A silencer device for a firearm, in particular for a rifle or another long or short firearm, comprising:

   a flap mechanism (10) comprising at least one closing flap (10) mounted transversely to the axis on the barrel (42) of the firearm in order to temporarily seal the barrel after the passing of ammunition and to prevent the passage of the combustion gases and the sound wave towards the mouth of the barrel when a shot is fired,

   an actuation unit (31, 34, 35) including a mobile portion (31) arranged axially on the barrel of the firearm so as to move a control mechanism (6), the axially mobile portion (31) having an inner bore suitable for allowing the passage of ammunition,

   the control mechanism (6) including at least one amplitude lever arm (8) pivotably mounted on a pivot (7) attached to the barrel, each amplitude lever arm (8) being coupled to a separate closing flap (10),

   the mobile actuation unit (31, 34, 35) engaging with the control mechanism (6) to allow a transverse movement of said at least one closing flap (10) between an open position, in which the flap mechanism (10) allows ammunition to pass towards the mouth of the barrel (42), and a closed position, which prevents the passage of the combustion gases and the sound wave after the passing of ammunition, and

   an exhaust unit (11, 21-27) including at least one exhaust pipe (11, 21) arranged on the barrel upstream from the closing flap mechanism (10) in order to redirect the combustion gases and the sound wave and allow them to be discharged from the barrel.
2. The silencer device according to claim 1, wherein the mobile portion (31) of the actuation unit (31, 34, 35) is substantially cylindrical (31) and can be inserted into a receptacle within the barrel, the mobile portion (31) forming the inner bore of the mobile portion (31) having a diameter substantially equal to the inner diameter of the 10 barrel (42) so as to allow the passage of the ammunition.
3. The silencer device according to claim 1 or 2, wherein the control mechanism (6) comprises a transmission rod and the mobile portion (31) includes a coupling assembly (34-36) coupled to the transmission rod so as to move the control mechanism (6) in a direction generally parallel to the axis of the barrel (42).
4. The silencer device according to any one of the preceding claims, wherein the control mechanism (6) includes a guide and transmission ring (6) capable of sliding over the barrel, the ring (6) engaging with the rod and the mobile portion (31) so as to transmit the movement to the lever arm (8).
5. The silencer device according to any one of the preceding claims, wherein the flap mechanism (10) comprises two closing (10) flaps (10) that are arranged in a seat (37) located transversely to the axis of the barrel and that are of a predetermined length and are slightly offset from one another along the axis of the barrel (42), such that they partially overlap one another in the closed position without hindering one another.
6. The silencer device according to any one of the preceding claims, wherein the flap mechanism (10) comprises two closing (10) flaps (10), each flap (10) includes an opening for receiving the end of the amplitude lever arm (8) so as to transmit the pivoting movement of the amplitude lever (8) and actuate the flap (10) in a transverse direction relative to the axis of the barrel.
7. The silencer device according to any one of the preceding claims, wherein the flap mechanism (10) comprises two closing (10) flaps (10) and the guide ring (6) also includes two support parts arranged laterally to the axis of the barrel, each forming an elongate opening for receiving the end of one of the lever arms (8) and for enabling the actuation of the lever arms (8) by pivoting on the pivots (7) in order to close and open the flaps (10).
8. The silencer device according to any one of the preceding claims, wherein the control mechanism (6) includes at least one first return spring (32) associated with the guide ring (6) such that said guide ring can resume its initial position, lowering the pressure of the gases.
9. The silencer device according to any one of the preceding claims, wherein the exhaust unit (11, 21-27) further comprises an expansion chamber (27) connected to said at least one exhaust pipe (11, 21) so as to receive the gases transported by said at least one exhaust pipe (11, 21), the expansion chamber (27) including vents (24) for discharging the combustion gases and the sound wave from the expansion chamber (27).
10. The silencer device according to claim 9, wherein the expansion chamber (27) also comprises an inner pipe (23) connected to flaps capable of sealing the vents (24), and wherein the gases enter the expansion chamber (27) via an opening (22) made in the inner tube (23) once said tube has been pushed to its end position and has thus sealed the vents (24), and, as the pressure reduces, the inner tube (23) resumes its starting position owing to a return spring (26), thus allowing the combustion gases and the sound wave to be discharged from the expansion chamber (27) via the vents (24).
11. The silencer device according to any one of the preceding claims, wherein the mobile portion (31) of the substantially cylindrical (31) actuation unit (31, 34, 35) joins a portion of the barrel (42) that passes through the seat (37) of the closing flap mechanism (10) and an end portion (38) of the barrel, and includes a covering portion and a covered portion separated by a shoulder, the covering cylindrical portion being able to cover the portion of the barrel (42) that passes through the seat (37) of the flap mechanism (10), and the covered cylindrical portion being able to be covered by the end portion (38) of the barrel.
12. The silencer device according to claim 11, wherein the final portion (38) of the barrel comprises a receptacle including a first cylindrical portion able to receive the covering portion of the mobile part (31), and a second cylindrical portion of a smaller diameter able to receive the covered portion of the mobile part (31), the first cylindrical portion and the second cylindrical portion of the end portion (38) being separated by a shoulder.
13. The silencer device according to claim 12, wherein the first cylindrical portion of the end portion (38) is longer than the covering cylindrical portion of the mobile part (31) so as to allow the axial movement of the mobile part (31), the second cylindrical portion of the end portion (38) being substantially the same length as the covered cylindrical portion of the mobile part (31).
14. The silencer device according to either one of claims 12 or 13, wherein the covering portion of the mobile part (31) has an inner diameter corresponding to the outer diameter of the portion of the barrel (42) that passes through the seat (37), and has an outer diameter corresponding to the inner diameter of the first cylindrical portion of the end portion (38).
15. The silencer device according to any one of claims 1 to 10, wherein the mobile portion (31) of the substantially cylindrical (31) actuation unit (31, 34, 35) forms the end portion of the barrel and includes a covering portion and a final portion separated by a shoulder, the covering cylindrical portion of the mobile part (31) being able to cover a portion of the barrel (42) that passes through the seat (37) of the closing flap mechanism (10), and the end portion forming the mouth of the barrel.
16. The silencer device according to claim 15, wherein the covering portion of the mobile part (31) comprises a receptacle including a cylindrical portion capable of receiving the cylindrical portion of the barrel (42) that passes through the seat (37) of the flap mechanism (10) and of enabling the axial movement of the mobile part (31), the cylindrical portion of the barrel (42) being substantially the same length as the covering cylindrical portion of the mobile part (31).
17. The silencer device according to either one of claims 15 or 16, wherein the covering portion of the mobile part (31) has an inner diameter corresponding to the outer diameter of the portion of the barrel (42) that passes through the seat (37) of the flap mechanism (10).
18. The silencer device according to any one of claims 15 to 17, wherein the mobile part (31) at the end of the barrel forms a choke where the inner diameter decreases in the direction of the mouth of the barrel, the covering cylindrical portion covering the barrel (42), and the end portion including an inner conical portion of a maximum diameter that is equal to the inner diameter of the barrel and narrows towards the outlet of the barrel.
19. A long or short firearm, in particular a rifle, comprising a silencer device according to any one of the preceding claims, wherein the barrel of the firearm comprises a fixing system formed by said pivots (7) and a seat (37) arranged transversely to the axis of the barrel, said seat receiving said closing flap mechanism (10) so as to fix the silencer device to the barrel.
20. A method for silencing a firearm, in particular a rifle or another long or short firearm, when a shot is fired, the method comprising the following steps:

    temporarily sealing the barrel after the passing of ammunition and preventing the passage of the combustion gases and the sound wave towards the mouth of the barrel (42) when a shot is fired, by means of a flap mechanism (10) comprising at least one closing flap (10) mounted transversely to the axis on the barrel of the firearm,

    moving an actuation unit (31) and a control mechanism (6) by way of the thrust of ammunition passing through a mobile portion (31) of the actuation unit (31) arranged axially on the barrel of the firearm, the axially mobile portion (31) having an inner bore for allowing the passage of ammunition,

    the control mechanism (6) including at least one amplitude lever arm (8) pivotably mounted on a pivot (7) attached to the barrel, each amplitude lever arm (8) being coupled to a separate closing flap (10),

    generating, by means of the actuation unit (31) and the control mechanism (6), a transverse movement of said at least one closing flap (10) between an open position in which the flap mechanism (10) provides the passage of an ammunition towards the mouth of the barrel (42) and a closed position preventing the passage of combustion gases and the sound wave after passage of the ammunition, and redirecting the combustion gases and the wave sound and allowing them to be discharged from the barrel by means of an exhaust unit (11, 21-27) comprising at least one exhaust pipe (11, 21) arranged on the barrel (42) upstream of the closing flap mechanism (10).

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