HK40003225B - Silencer device for firearm - Google Patents

Description

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

Technical field

In the first place, the present invention relates more specifically to a sound-neutralizing device for a firearm, such as a rifle or other long or short firearm.

The second aspect is that the invention proposes a method of sound neutralization for firearms, particularly rifles or other firearms when a shot is fired.

In a third aspect, the invention proposes a firearm, particularly a rifle, including an improved sound neutralizing device.

Indication of the state of the art:

In the case of the earlier technique, there is the classic silencer which can be added to a firearm, gas or air gun, also called a sound moderator, which attempts to mechanically reduce the latter.

As an example, WO 96/03612 shows a sound-moderating device for Ball Trap rifles or recreational overlapping guns of all calibers. This firearm silencer consists of a tubular body mounted on the gun barrel and comprising an annular expansion chamber behind the tubular body and a series of internal transverse chimes supported by gaps and equipped with openings to allow the passage of lead shot and gunpowder.

Publications WO 2011/035111 A1 and WO 2014/000805 reveal other examples of silencers for firearms, in particular for automatic rifles or other long guns, which have a silencer mounted on the Parma barrel, a muzzle brake, which can be screwed to the silencer, being fixed to the barrel.

DE2238834 A concerns a sound-absorbing device for firearms, in particular rifles and other long or short firearms, and a method of sound-absorbing firearms.

The classic silent

A silencer or sound moderator is a device that can be added to a firearm, gas or air gun, to reduce the noise and light flash it produces when a shot is fired, and thus gain discretion.

The silencer is usually a cylindrical tube that fits into the barrel of the gun, and the internal mechanism, which varies depending on the ammunition used, allows the propellant gases to be released into the atmosphere as little as possible.

Because the silencer only slows the gas at the gun's exit, it does not interfere with the noise caused by the passage of the projectile at supersonic speed (speed higher than that of sound which is about 340 m/s in air at 15 °C) which, bypassing the sound wall, produces a detonation noise on its own course.

A silencer is mainly a comfort tool, because it reduces the mouth wave of a gun. This mouth wave is the cause of ENT trauma, in the area of the nose, throat and ears, which cannot be protected by the usual means (earplugs, helmets, etc.).

It should be noted that the two main factors affecting the value of the speed of sound are the volume mass and the constant of elasticity (or compressibility) of the propagation medium: - What? The propagation of sound is all the faster as the volume mass of the medium and its compressibility are small. From one medium to the other, both parameters change. In helium, whose compressibility is approximately equal to that of air, but whose volume mass is, under the same temperature and pressure conditions, much lower, the speed of sound is almost three times greater than in air. In a gas at atmospheric pressure, the speed of sound is much lower than in a liquid: although the volume mass of the gas is much lower, it is almost infinitely more compressible than the 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 Pair at 15 °C and approximately 1 500 m/s in seawater.

The effectiveness of silencers is relative: the sound reducer suppresses the mouth wave and consequently the consequent detonation and makes the sound more diffuse while suppressing the flame at the mouth of the weapon. The term sound moderator is sometimes used; the performance of this type of device varies greatly, depending on the type of reducer employed and the Parma used. The shot is less difficult to hear, it is also more difficult to identify as a gunshot as well as more difficult to locate both due to the distortion of the sound and the absence of flame.

These large sleeves have several gas expansion chambers inside which reduce the sound of the detonation with varying degrees of success.

The drawbacks are: heavy weight (several hundred grams or even more than a kilogram), large dimensions, imbalance of the weapon (it stings the nose), impossibility of use in double-barreled weapons and, in most cases, with bullets.

The diameter of the holes separating the different silencer elements through which the projectiles pass is much larger than the caliber, and they allow some of the gases to escape to the front of the projectile, thus disturbing the accuracy of the projectile and decreasing its speed by about 4 to 6 m/s.

The conventional silencer is expensive, difficult to maintain (to clean it one must completely dismantle it component by component), and for some models of rifle, its service life does not exceed 800 strokes.

The projectile passes through the various chicanes, letting the gases behind it relax into the alveoli and thereby reduce the intensity of the sound wave.

The effectiveness of such a silencer lies in two factors: its size (the larger it is, the more it absorbs), and its distance from the combustion chamber (the farther it is from it, the more effective it is).

The noise normally produced by a firearm detonation is in the range of 120 to 170 dB. Thus, a sudden noise or prolonged exposure to a noise environment that is too loud (above 100 dB) can cause temporary or permanent hearing impairment.

In addition, implementation difficulties also arise, particularly for some conventional silencers or silencers which are not sufficiently effective in reducing noise when a shot is fired with the weapon, which poses certain problems.

Summary of the invention

It is therefore clear that a system is needed which, to a large extent, can remedy the above mentioned shortcomings encountered in the previous technique.

One object of the invention is to provide an improved sound neutralizing device for firearms, particularly rifles or other long or short firearms.

Whereas a conventional silencer, also called a sound moderator, attempts to mechanically reduce the sound, the purpose of the present invention is therefore to propose a device which can completely eliminate and inhibit the sound produced when a shot is fired, allowing it to exhaust itself 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 is achieved, according to the invention, by the fact that the firearm sound-neutralizing device incorporates the characteristics of the characteristic part of claim 1.

In particular, for this purpose, according to the invention, this purpose is achieved by the fact that the sound-neutralizing device of the above type comprises: a flap mechanism (10) comprising at least one flap (10) of closure mounted transversely on the barrel axis (42) of the firearm to temporarily close the barrel after the passage of an ammunition and to prevent the passage of flue gases and sound wave to the barrel mouth when a shot is fired,an actuation unit (31,34,35) comprising a movable part (31) arranged axially on the barrel of the firearm to activate a control mechanism (6),The axially movable part (31) having an internal bore suitable for the passage of ammunition,the control mechanism (6) having at least one lever arm (8) rotating on a pivot (7) attached to the barrel, each lever arm (8) being coupled to a closing shutter (10) respectively,the movable actuator unit (31,34,35) cooperating with the control mechanism (6) allowing for the transverse movement of at least one shutter (10) between an open position in which the valve mechanism (10) provides the passage of ammunition to the barrel mouth (42) and a closed position preventing the passage of the flue gas and its sound after the ammunition has passed,andan exhaust unit (11, 21-27) with at least one exhaust pipe (11, 21) located on the barrel upstream of the shutter mechanism (10) to redirect and allow the flue gases and sound wave to escape out of the barrel.

Thus, to achieve this, the shutter mechanism is used to temporarily close the barrel just after the projectile has passed and to redirect the flue gases and sound wave to an expansion vessel for final processing.

Preferably, in an embodiment of the invention, the actuating unit has a moving part (31) of the barrel, moved by the projectile as soon as it has fully passed through the shutters and extended by a rod connected to the control ring.

Depending on the invention, to ensure the motority of the entire system, a small part of the gun is made mobile. This part can be terminal or medial. Preferably, as the projectile passes through the moving part (31), it is pushed axially forward into the part (38) of the gun downstream by the pressure of the gases inside the gun.

In the case where the movable part is median, it shall be joined to the part of the barrel which emerges from the seat of the shutters and to the terminal part of the barrel.

The inside of the gun (in which the projectile moves) is broken down into three perfectly aligned parts.

Preferably, the moving part piece has a covering part and a covered part. In its covering part, the moving part covers the barrel, and in its covering part it is covered by the final part of the barrel. - What? The length of the part of the gun that passes through the seat of the shutters is in principle a fixed length which is equal to the length of the bullet.

The final part of the gun which is grafted onto the seats of the shutters will contain the entire moving part. The final part of the gun may be very short.

In the case where the moving part is terminal, this final piece forms the mouth of the cannon. This is the same configuration for both bullets and chokes. While for bullets the moving part is preferably cylindrical and fairly short, for shotguns the moving part preferably has the shapes, designs, and length of a traditional choker.

Preferably, the control mechanism has a guide and transmission ring adapted to slide on the barrel, the ring cooperating with the rod of the moving part of the barrel to transmit the movement to the lever arms. Preferably, the shutter flaps are arranged in a seat placed transversely to the barrel axis and of predetermined length and if there are two slightly offset from each other along the barrel axis, so that in the closed position they partially overlap without colliding.

In an embodiment of the invention each shutter has an opening suitable to receive the end of the lever arm to transmit the rotational motion of the lever and operate the shutter in a transverse direction relative to the barrel axis.

Preferably, the guide ring also comprises two corner-shaped supporting parts with an angular edge surface directed towards the shutters adapted to allow the operation of the pivoting lever arms on the pivots and the closing of the shutters.

In one embodiment of the invention, the control mechanism has at least one first spring of booster associated with the guide ring to return 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 the said at least one exhaust pipe to receive the gases carried by said at least one exhaust pipe, the expansion vessel having nozzles to allow the flue gases to escape out of the expansion vessel.

Preferably, the expansion vessel consists of an internal tube connected to appropriate shutters to close the nozzles, and in which gases enter the expansion vessel through an opening made in the internal tube once it has been pushed to the end of the stroke and thus closed nozzles and, as the pressure decreases, the internal tube returns to its initial position thanks to a booster spring thus letting the flue gases escape out of the expansion vessel through the nozzles when the sound is naturally exhausted.

In a preferred embodiment of the invention, the moving part of the substantially cylindrical drive unit joins a part of the barrel that passes through the seat of the shutter and a terminal part of the barrel, and has a covering part and a covered part separated by a shoulder, the covering cylindrical part being adapted to cover the part of the barrel that passes through the seat of the shutters, and the covered cylindrical part being adapted to be covered by the terminal part of the barrel.

Preferably, the end part of the barrel comprises a housing with a first cylindrical part adapted to accommodate the moving part covering and a second cylindrical part of a smaller diameter adapted to accommodate the moving part covering, the first cylindrical part and the second cylindrical part of the terminal part being separated by a shoulder.

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

Preferably, the covering part of the moving part has an inner diameter corresponding to the outer diameter of the part of the gun that passes through the seat, and has an outer diameter corresponding to the inner diameter of the first cylindrical part of the terminal part.

In another preferred embodiment of the invention, the moving part of the substantially cylindrical drive unit forms the terminal part of the barrel and has a covering part and a final part separated by a shoulder, the cylindrical covering part of the moving part being adapted to cover a portion of the barrel that passes through the seat of the shutters, and the terminal part forming the barrel mouth. - What? Preferably, the moving part covering comprises a housing with a cylindrical part adapted to accommodate the cylindrical part of the barrel that passes through the shutter seat and allows axial movement of the moving part, the cylindrical part of the barrel being substantially the same length as the cylindrical part covering the moving part.

Preferably, the part covering the moving part shall have an inner diameter corresponding to the outer diameter of the part of the barrel that passes through the seat of the shutters.

Preferably, for shotguns, the terminal moving part to the barrel forms a choke whose inner diameter shrinks towards the barrel mouth, the cylindrical part covering the barrel, and the terminal part having an inner conical part of a maximum diameter equal to the inner diameter of the barrel and shrinking towards the barrel outlet zone.

In another embodiment of the invention (not illustrated), a second pair of flaps independent of the first (or a single flaps), located at the cartridge chamber exit, may be placed on automatic or semi-automatic weapons; these flaps, mechanically operated by the weapon's own ejection/recharge device, are used to prevent the flue gas, sound wave and flash from escaping through the open casing when the casing is ejected.

In another embodiment of the invention, the sound-absorbing device for a firearm, in particular a rifle or other long or short firearm, includes: at least one closing shutter mounted transversely on the firearm barrel axis to temporarily close the barrel after a projectile has passed and to prevent the passage of the flue gas and sound wave to the barrel mouth when a shot is fired,an actuating unit with a movable part of the barrel downstream of the closing shutter to move the control mechanism by passing the projectile;the control mechanism comprising at least one pivoted amplitude lever arm mounted on a pivot fixed to the barrel,the lever arm is coupled to the shutter, the actuating unit cooperates with the control to allow the shutter to move transversely between an open position in which the shutter provides passage of ammunition to the barrel mouth and a closed position preventing the passage of flue gases and sound wave after the projectile has passed, and an exhaust unit with at least one exhaust pipe located on the barrel upstream of the shutter to redirect and allow the flue gases and sound wave to escape out of the barrel.

In another respect, the invention proposes a long or short firearm, in particular a rifle, comprising a neutralising device of the above type in which the gun barrel includes a fixing system formed by the said pivots and a seat arranged transversely at the axis of the barrel receiving said shutter mechanism to attach the neutralising device to the barrel in a removable manner.

To this end, the invention proposes, in another aspect, a method of sound neutralization for firearms, particularly rifles or other firearms, when a shot is fired, the method comprising the steps of: temporarily closing the barrel after a projectile has passed and preventing the passage of flue gases and sound waves to the barrel mouth when a shot is fired, by at least one closing shutter mounted transversely on the barrel axis of the firearm,move a control mechanism by the action of the projectile passing through a portion of the moving barrel;control mechanism with at least one arm;amplitude lever mounted pivoting on pivots attached to the barrel,the amplitude lever arm is coupled to a shutter,respectively,generate, by means of the actuating unit and the control mechanism, a transverse movement of the shutter between an open position in which the shutter provides passage of a projectile to the barrel mouth and a closed position preventing the passage of the flue gas and sound wave after the projectile has passed, and direct and allow the flue gas and sound wave to escape out of the barrel by means of a control unit comprising at least one exhaust pipe on the barrel above the shutter mechanism.

Thus, to achieve this, one or more shutters are used to temporarily close the barrel just after the projectile has passed and to redirect the flue gases and sound wave to an expansion vessel for final processing.

Sound waves from a gunshot

There are basically three sound waves that are generated by a shot, two occurring inside the barrel, and one outside.

Err1:Expecting ',' delimiter: line 1 column 303 (char 302)

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, give a volume of about 1.12 m3.

The sound wave produced by the combustion and bang, travels (at this temperature) at about 1500-1800m/s, instantaneous speed, while the projectile is still in the acceleration phase, the latter only reaching its maximum speed after about 60 cm of running.

According to the invention, the sound wave has three properties that interest us: first, when it encounters an obstacle, it bounces (echo phenomenon), second, it does not propagate in vacuum, and third, and more interesting for the sound neutralizing device of the present invention, is that it has a short life.

The sound wave does not stick to the projectile, but bounces back towards the bullet, which in turn sends it back towards the projectile, and then it moves back and forth between the two obstacles until the projectile exits the barrel at a variable speed, depending on the temperature of the medium in which it is moving and the gases that carry it.

Whereas a conventional silencer of the above type, also called a sound moderator, attempts to mechanically reduce the sound, the sound inhibitor of the present invention, by holding the sound for a very short moment inside the barrel, allows it to be completely depleted in a natural way and succeeds in eliminating it completely.

In addition, the gun sound-neutralizing device of the present invention has the advantages of weight (about 50 grams in total), manufacturing cost, and efficiency.

So all that remains is the noise produced by the sound wave generated outside the barrel.

In fact, the gun sound neutralizing device of the present invention allows the sound wave to destroy itself naturally and mainly processes the pressure generated by the gases. If there was no planned exhaust pipe exhaust, the gases would remain compressed inside the gun with the shutters closed. They would relax only when the gun is opened, safe but with some inconvenience.

According to the invention, it was considered preferable to increase the volume of the barrel by one or two exhaust pipes.This additional volume lowers the pressure of the gases and allows the shutters to open through the spring system and allows the gases to escape naturally to the front and through the end of the exhaust temporarily closed by shutters of similar size to those on the barrel.The decrease in pressure of the gases inside the barrel is also caused by their rapid cooling.

Brief description of the figures

Further features and advantages of the invention will be shown in the following detailed description, and in order to enable a clearer understanding of the invention, several preferred embodiments will be described below by way of example, referring in particular to the figures in the Annex, among which: Figure 1 shows a sound-neutralizing device for firearms in an embodiment of the invention,Figure 2 shows a partial cut side view of the device as shown in Figure 1,Figure 3 shows a side view before assembly of the device as shown in Figure 1,Figure 4 represents a partial side view of part 38 of the device as shown in Figure 1,Figure 5 represents a partial side view in cut of part 38 of the device as shown in Figure 1,Figure 6 represents a partial side view of the device as shown in Figure 1,Figure 7 represents a partial side view of the device as shown in Figure 1,Figure 8 illustrates a sound-neutralizing device for firearms in another embodiment of the invention,Figure 9 represents a partial side view in cut of the device as shown in Figure 1,Figure 10 represents a partial side view in cut of the device as shown in Figure 8,Figure 11 illustrates a firearm sound-neutralizing device in another embodiment of the invention,Figure 12 represents a partial side view of the device as shown in Figure 11,Figure 13 represents a side view of an exhaust unit of the firearm sound-neutralizing device in an embodiment of the invention.

The following are the methods of implementation of the invention:

The present invention is described with particular achievements and references to figures but the invention is not limited by these. The drawings or figures described are only schematic and are not limiting. - What? Figure 1 illustrates a sound-neutralizing device for a firearm in an embodiment of the invention. - What? In the preferred embodiment shown in Figure 1, two closing shutters (10) are mounted transversely on the axis of the gun barrel to temporarily close the barrel after a projectile has passed and to prevent the passage of flue gases and sounding agents to the barrel mouth (42) when a shot is fired.

The closing shutters (10) are arranged in a seat (37) transversely to the barrel axis and are of predetermined length and slightly offset from each other along the barrel axis so that in the closed position they partially overlap without colliding.

The control mechanism (6) has two lever arms (8) mounted on pivots (7) to allow a transverse movement of the two shutter shutters (10) between an open position in which the shutters (10) allow a projectile to pass to the barrel mouth and a closed position preventing the passage of flue gases and sound after the projectile has passed.

The exhaust unit (11) has two exhaust pipes (11) arranged upstream of the shutter (10) to redirect and allow the flue gases and sound wave to escape out of the barrel (42).

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

The control mechanism (6) operates the arms of the amplitude levers (8) which close the shutters (10) and allow the gases to escape through the pipes (11). The shutters (10) (and their seat 37) are placed transversely to the axis of the barrel (42) and are of predetermined length and slightly offset from each other according to the barrel's pitch, so that in the closed position they partially cover each other without colliding.

The advantage is that each shutter (10) has an opening suitable for receiving the end of the lever arm (8) to transmit the rotational motion of the lever (8) and to operate the shutter (10) in a direction transversely related to the barrel axis (42).

Preferably, the control mechanism (6) has a guide ring (6) suitable for sliding on the barrel and connected to the rod of the moving part of the barrel (31) to transmit the movement to the lever arms (8).

The advantage, as can be seen for example in Figures 1 and 2, is that the guide ring (6) also has two base parts arranged laterally on the axis of the barrel (42) each forming an elongated opening to accommodate the end of one of the lever arms (8) and having an angular guide surface (straight or curved) directed towards the shutters (10) adapted to enable the lever arms (8) to be actuated by pivoting on the pivots (7) to close and open the shutters (10).

Alternatively, in an unillustrated embodiment, the guide ring (6) has two cornered base parts arranged laterally to the axis of the barrel (42) and having an angular edge surface (straight or curved) directed towards the shutters (10) suitable for operating the lever arms (8) by pivoting on the pivots (7) to close and open the shutters (10).

The projectile passes through the moving part of the barrel (31) and pushes the barrel forward, thus pulling the ring (6) by means of the rod, transmitting the movement to it, which allows the ring to operate the lever arms (8) on the pivots (7) that close the shutters (10), diverting the gases to the exhaust (11).

The entire mechanism may be protected by a hood for normal use and avoid damage in use with a firearm, but this will depend on the weapon and its components.

The two shutters (10) close the barrel after the bullet passes, so that the sound wave and gases are redirected to an expansion vessel. A second pair of shutters can be used to close the barrel at the base in the case of automatic or semi-automatic weapons. The control ring (6) is actuated by passing the projectile past the shutters in a small portion (31) of the barrel that is mobile and connected to the control ring (6) by a rod.This piece (31) is movable and moves about 0.5mm, which is used to close the shutters (10) immediately after the ball passes. The proportion of the amplitude levers is dependent on the caliber of the weapon, the maximum being 10 for a 12 caliber mono-gun or superimposed, 20 for a 12 caliber juxtaposed (lateral), as for this weapon one is required to have a single shutter (10).

As can be seen in Figure 2, the control mechanism (6) comprises a transmission shaft and the moving part (31) comprises a coupling assembly (34-36) to move the control ring (6).

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 in the transmission shaft allows the shaft position to be adjusted axially in relation to the coupling arm (34) and the moving part (31) by tightening the nut (36).

The transmission shaft is positioned in a direction generally parallel to the axis of the barrel defining the direction of the projectile.

The control mechanism (6) with the rod is coupled to a spring (32) on a mounting anchorage (33) to the barrel.

The Commission has

In this version, the device can either be incorporated into the weapon at the time of manufacture or added to an existing weapon as an extension of the existing gun (s) or as an extension of the gun (s) after shortening of the latter.

1. device incorporated in the weapon:

In the case where the device is incorporated into the weapon, as can be seen in Figures 1 to 3, the piece (31), as an extension of the cannon, is mobile, its beginning being located after the flaps (10) at an exact distance corresponding to the length of the body of the projectile. - What? The axial force produced on the piece (31) by the projectile being far greater than the requirements of the device, it can be reduced either by increasing the diameter of the said piece (31) which is in principle the same caliber as the gun, or by adding a spring (not shown) around the right part of the piece (31) which fits into the piece (38), or both. - What? Note that the coin (31) does not hit the coin (38) that receives it.

As shown in Figure 3, the moving part (31) is medial to the gun. This moving part (31) forms the joint with the part of the gun (42) coming out of the seats (37) of the shutters (10) and the terminal part (38) of the gun. This moving part (31) is cylindrical and has an internal bore suitable for the passage of a bullet. - What? The cylindrical movable part (31) has a covering part and a covered part separated by a shoulder. - What? In its cylindrical covering part, the moving part (31) covers the barrel (42), and in its cylindrical covering part it is covered by the final part (38) of the barrel. - What? The length of the part of the barrel (42) that passes through the seat (37) of the shutters (10) has a fixed length that is equal to the length of a bullet for this type of weapon.

In its covered part, the piece (31) reproduces the part (42) which emerges from the shutters (10) and is in turn covered.

As shown in Figures 2 and 5, the end (38) of the barrel consists of a housing with a first cylindrical part suitable for the covering part of the moving part (31) and a second cylindrical part of a smaller diameter suitable for the covering part of the moving part (31).

The first cylindrical part of the end part (38) is longer than the cylindrical part covering the moving part (31) to allow axial movement of the moving part (31). The second cylindrical part of the end part (38) may be the same length as the cylindrical part covering the moving part (31). The end part (38) of the barrel may be very short.

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

As can be seen in Figure 3, the assembly may be such that the device (31,37,38) is incorporated into the weapon at the time of manufacture. - What? The seat (37) of the flaps (10) is fixed to the part 38 of the weapon, which is the extension of the barrel. The right part of the movable part (31) is inserted between the seat (37) and the part 38.

As shown in Figures 4 and 5, the part (38) of the device as shown in Figure 1 forms the terminal part (38) of the barrel and has a part for the assembly of the shutters (10) and the moving part (31) to the seat (37).

For example, in the case of a 30 Blaser calibre carbine, referring in particular to Figures 1 to 3, the specific dimensions recommended for the device incorporated in the weapon may be as follows:

It's a .30 caliber Blaser.

The projectile diameter is 7.85 mm Internal diameter of the gun at the top of the grooves: 7.6 mm External diameter of the gun 15 mm Length of the bullet body (without the pointed part): 20 mm

Part of the barrel (42) that exits the seat flaps (37)

Length: 20 mmInner diameter 7.6 mmOuter diameter: 10 mm

- Mobile room (31)

Total length 24 mm

The following shall be included:

Length: 20 mmOuter diameter: 12 mmInner diameter: 10.2 mm

Covered area:

Length: 4 mmOuter diameter: 10.2 mmInner diameter: 7.6 mm

The following shall be added:

Outer diameter: 15 mm (indifferent length) Inner diameter first part: 12.2 mm by 23 mm (piece 31 will thus have 3 mm of beat) Inner diameter second part: 10.2 mm by 4 mm Inner diameter final part: 7.6 mm to the end

2. Added to existing weapons:

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

The caliber of the gun is the same throughout the gun, while on most shotguns the gun ends in a narrowing called a choke, which is different in size depending on the desired performance.

In the case of shotguns it is well known that when firing a cartridge, the impact of 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 choke or strangulation to be mounted on the rifle guns to decrease their output diameter, so as to increase the range of the shot and limit the projection of lead.

It is therefore clear that, on the one hand, the possibility of choosing the appropriate shock must be maintained on these weapons, and on the other hand, if only one final part is used, there will be an increase in the axial force on this part.

Thus, for the projectile weapons the configuration as shown in Figures 8 and 9 is used, while for the shotgun weapons the configuration as shown in Figure 10 is used.

The alternative for shotguns is to use a mini-piece (38) with a screw at the outer end of which a choke (Figure 10) of the above type is bolted to form a throttle or narrowing to be mounted on the barrel to reduce the projectile diameter, so as to increase the range of fire and limit the projectile grain.

Figures 8, 12 and 9 (in split) show a moving part (31) mounted in the final part of the gun. This is the same configuration for both bullets and chokes. While for bullet weapons, the part (31) will be cylindrical and fairly short, for shotguns the part (31) will have the shapes, configurations, and length of a traditional choker (Figure 10).

As shown in Figures 8 and 9, the movable part (31) is terminal to the gun. This movable part (31) is mounted on the part of the gun (42) coming out of the seats (37) of the shutters (10). This movable part (31) is cylindrical and has an internal bore suitable for the passage of a bullet. - What? The cylindrical movable part (31) has a covering part and a final part separated by a shoulder. - What? In its cylindrical covering part, the moving part (31) covers the barrel (42), and in its final cylindrical part it forms the barrel mouth.

In its final part, the part (31) reproduces the part (42) coming out of the shutters (10). The part (31) is then grafted onto the part (42) coming out of the shutters (10) (Figure 9).

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

The part covering the movable part (31) has an inner diameter corresponding to the outer diameter of the part of the barrel (42) passing through the seat (37).

For example, in the case of a 30 Blaser calibre carbine, referring in particular to Figures 8 and 9, the specific dimensions recommended for the device added to the existing weapon may be as follows:

It's a .30 caliber Blaser.

The projectile diameter is 7.85 mm Internal diameter of the gun at the top of the grooves: 7.6 mm External diameter of the gun 15 mm Length of the bullet body (without the pointed part): 20 mm

Part of the barrel (42) that exits the seat flaps (37)

Length: 20 mmInner diameter 7.6 mmOuter diameter: 10 mm

Other, of circular cross-section

Total length 24 mmOuter diameter 15 mm

The following shall be included:

Length: 20 mmInterior diameter: 10.2 mm

The final part:

Length: 4 mm.Inner diameter: 7.6 mm.

As shown in Figure 10, the movable part (31) is terminal to the barrel and forms a choke used especially for shotguns, the choke forming a passage for the lead, which extends into the barrel extension and whose internal diameter is reduced towards the barrel mouth.

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

As shown in Figure 11, for all embodiments, the resistance of the part (31) to axial movement can be strengthened by means of booster springs (40) placed between a part (31) and a rod (39) attached to the seat (37) of the shutters (10) to allow the part (31) to withstand axial movement and return to its initial position.

It should be noted that the length of the bullet of a shotgun is approximately the length of the barrel, which depends on the ammunition used and the length of the chamber of the rifle.

Of course, a longer chamber may use shorter casings, the opposite being in principle impossible and not recommended. The length of a skirt gun for a 70mm round is about 40mm.

Misuse 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 firing were passed through by the projectiles, even in a 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 combined with the exhaust pipes (21) for the treatment of recovered gases and inhibition of the sound wave.

In the manner shown in Figure 13, the expansion tank (27) is coupled to the exhaust pipes (21) and has an internal shaft (23) moved by the gas pressure to redirect these gases. The expansion tank 27 receives the gases carried by the recovery pipes (21) which enter the expansion tank 20 27 by the opening (22) on the shaft (23) once it has been pushed at the end of the stroke and thus closed the openings (24). A pressure valve (25) is present (but could be replaced by small holes).

Method of operation and details

The ultimate purpose of the device achieved by the invention described herein is the inhibition of the sound wave produced by the firing of the ammunition (shot). - What? This shutter, designed to inhibit the sound wave produced by the firing of the ammunition (shot), prevents the release of combustion gases and sound waves through the barrel mouth by diverting them to an appropriate processing area, while leaving intact the prerogatives of the ammunition (speed, accuracy).

The principle

(a) a sound wave has a short life; (b) it cannot be stored; (c) it is stopped by any obstacle (in which case it bounces off a resonant box), whether it is stationary or moving; (d) it does not propagate in a vacuum; When firing, two sound waves are generated inside the barrel and only once each: 1) The detonation produced by the blast; 2) The typical bang of the sound wall when it is exceeded; The sound waves follow the projectile; although the speed of sound in a gas environment is variable (it can reach very high values depending on the temperature of the gases), the sound wave does not stick to the projectile inside the gun; if its speed is higher than that of the projectile, there are back and forth of this wave inside the gun.

Implementation of the Directive:

Assuming that the maximum speed of a projectile is reached after 60 cm of stroke, an opening of adequate dimensions is made after this distance to redirect the gases and a 25 cross rail is incorporated into the barrel, just after this opening, with a left and a right (or lower and upper) shutter each designed to close the transverse half of the barrel by superposition.

This applies to so-called long arms; for short arms the position of the device will be chosen accordingly.

The mechanism shall consist preferably of: (i) A mechanical or hydraulic shut-off valve with one shutter (solid or articulated) or, preferably, two juxtaposed shutters (2 overlapping halves, better solution because faster), a diaphragm (photo shutter type), with a cutter; spring-driven; The shutter valve (one shutter or double shutter) will close the barrel just after the projectile has passed through after it has traveled between 0.5 and 1 mm behind the shutters, this distance being freely chosen by the amplitude coefficient applied to the levers.

The tests that have been successfully carried out are: (a) neutralisation of gases in the expansion vessel; (b) closure of the barrel after the projectile has passed through by means of a flap valve; In summary, we have: (i) one or two closing shutters opposite on two slightly offset axes, to avoid interlocking; (ii) control device (kinetic drive by thrust of the projectile) with spring-loaded booster; (m) amplitude lever mechanisms on each side; (iv) opening (s) for redirecting gases; All component ratings shall be defined according to the caliber of the weapon and the maximum length of the projectile less, if necessary, the pointed front shoulder; - What? the total amplitude factor developed by the levers shall be defined as a function of caliber; - What? The residual noise is the noise caused by the projectile whipping through the air.

According to the invention, the motor capacity of the device is provided only by the passage of the ball through the part (31) which is mobile (displacement of the order of one 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 best use of the gas pressure. So the bullet, traveling from left to right in relation to the drawings - e.g. Fig. 2) as soon as it has crossed its full length the level of the flaps (10), enters the moving part of the barrel (31) giving it an axial forward motion. The moving part (31) drives the control ring (6) which, also moving from left to right, closes the flaps (10) by means of the lever arms (8). The gases and sound wave are thus deflected by the exhaust parts (11). The parts (31, 6, 8 and 10) return to the initial position of the spring (32).

Depending on the invention, the device is either incorporated into the barrel at the time of manufacture (in which case the device is located well before the barrel mouth, and therefore a tip of the barrel is added after the piece (31), or piece 38) - illustrated by the drawings (Fig. 2) or the device is attached to the end of the barrel side by side (Fig. 8) as an extension of the existing one or in place of a part of the existing one, after shortening it accordingly.

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

Gas and sound wave treatment

The closing mechanism consists of lever arms (8) operated by a piece (6) of variable shape. - What? Once the projectile has passed the shutter height, the shutters close directly behind and the gases are directed to one or two exhaust pipes leading to an expansion tank with a timer. The gases carried by the recovery pipes (21) enter the expansion tank through the opening (22) on the shaft (23) once the shaft has been pushed at the end of the run and thus closed the openings (24). A pressure relief valve (25) is present (but could be replaced by small holes).

Sequence of operation

Once the open flaps have been fully and barely passed, the projectile penetrates a moving part of the barrel (31) by pushing it forward, the rod of this part (31) being connected to the ring (6) pulling the ring forward, which results in the action of the lever arms (8) on the pivots (7) which will close the flaps (10), thus diverting the gases to the exhaust (11) and then processing them into the expansion vessel (27).

According to a preferred embodiment of the invention for a long firearm, it is therefore appropriate to: - What? Exhaust vents should be practiced after 60 cm of stroke, to which the expansion vessel, which is watertight and of the appropriate size to contain the combustion gases, will be fitted; this expansion vessel (27) may be of any shape and made of any material, solid or elastic; it may be applied to any or to the weapon (e.g. sideways on the barrel or below);

Just below these openings there will be a flap support (10) incorporated into the barrel during its manufacturing process or modification of the barrel; the flap device will be operated by tringling.

The movement of the entire device will be controlled by the thrust of the projectile on the moving part of the gun (31).

The amplitude coefficient shall be calculated according to the caliber so that the shutters close immediately after the projectile has passed, allowing it to advance by less than one millimeter.

Other, including: Number of parts

6Bage control7pivots8lever arms10vents10 11evacuation tubes31movable part32springback33spring anchor34spring rod or connecting arm15 35connecting view36bolt and screw37seat bolts38final part with gun39reinforcement rod20 40resort 41reinforcement anchor42canon21junction evacuation22opening on axis25 23axis and bolts24opening vase25suppression supports26recalled bolt27expansion vase

The Commission has not yet adopted a decision.

All parts, their shape and positions can vary infinitely: the recovery or exhaust pipes can be reduced to a single and not necessarily tubular, the expansion vessel may be of different shape, the 6 command represented by a full circular ring may be in a circle arc, etc.

The present invention is in no way limited to the embodiment described as an example and represented in the figures. Many changes of detail, shape, and size can be made to it without going beyond the scope of the invention as defined by the attached claims. The present invention has been described in relation to specific embodiments, which are purely illustrative and should not be considered as limiting. The 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).