EP2159530A1 - Interchangeable choke for a smooth bore firearm - Google Patents

Interchangeable choke for a smooth bore firearm Download PDF

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Publication number
EP2159530A1
EP2159530A1 EP09447034A EP09447034A EP2159530A1 EP 2159530 A1 EP2159530 A1 EP 2159530A1 EP 09447034 A EP09447034 A EP 09447034A EP 09447034 A EP09447034 A EP 09447034A EP 2159530 A1 EP2159530 A1 EP 2159530A1
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EP
European Patent Office
Prior art keywords
choke
barrel
interchangeable
interchangeable according
sealing means
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09447034A
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German (de)
French (fr)
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EP2159530B1 (en
Inventor
Thierry Dumortier
Joseph Mardaga
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Browning International SA
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Browning International SA
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Publication of EP2159530A1 publication Critical patent/EP2159530A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/32—Muzzle attachments or glands
    • F41A21/325—Mountings for muzzle attachments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/32—Muzzle attachments or glands
    • F41A21/40—Chokes for shotguns, e.g. automatic chokes

Definitions

  • the present invention relates to an interchangeable choke for a smooth-bore firearm.
  • the invention relates to firearms that are intended for lead cartridges whose charge, as is well known, is a certain amount of small balls or small balls of lead or other material.
  • This dispersion can be influenced by the use of what is called a choke.
  • the object of a choke of this type is to obtain a higher or lower dispersion of the lead, the choke forming a passage for the lead, which extends in the barrel extension and whose inner diameter is reduced towards the mouth of the barrel.
  • the pace of the diminishing passage determines the measure of the greater or lesser concentration of the impact of lead.
  • the difference between the inner diameter of the barrel and the internal diameter at the mouth is designated by the word chokage.
  • the chokage is made in the mass of the barrel; for this purpose, the diameter of the barrel is varied to the mouth according to the desired chockage.
  • An interchangeable choke includes a bushing made of treated steel, which is attached to the inside of the muzzle of the barrel.
  • the principle of chokage is based on a reduction of the internal diameter towards the mouth of the barrel.
  • the advantage of this family is that the chokage can be easily adapted to the needs of the shooter by mounting a choke having another configuration of the output diameter or by using a variable choke choke.
  • the present invention aims to provide a solution to one or more of the aforementioned drawbacks as well as others.
  • the invention relates to an interchangeable choke for a smooth-bore firearm, said choke being provided with mechanical coupling means for the assembly and disassembly of the choke, characterized in that the choke is provided with means for additional sealing to give the choke, at least in one place, a seal relative to the barrel.
  • An advantage associated with the use of the sealing means lies in the fact that the choke has practically no possibility of locking in its mounting position since these means make the dirt, mainly residues of powder, wad or lead will not have the opportunity to settle between the choke and the housing of the choke in the barrel, so that the choke, even after long shooting sessions, can be dismounted without problem.
  • An additional advantage to the deposition of dirt is that it facilitates the maintenance of the choke and the barrel, so that we can do without the intervention of a specialist armament.
  • the invention offers a decisive protection against choke blockage in the case of a screw choke comprising a fine screw thread.
  • the seal is guaranteed by a sealing ring, made of elastomer or other flexible or heat-shrinkable material, which is applied in a constriction made in the outer surface of the choke.
  • An advantage of this embodiment lies in the fact that the choke has practically no opportunity to unscrew during the shot.
  • the frictional forces that result from contacting the compressed sealing ring ultimately result in a torque that opposes the force torque required to disassemble the choke.
  • the sealing ring By applying the sealing ring in a necking of the outer surface, it prevents a displacement of the sealing ring during the insertion of the choke into the barrel.
  • the sealing means can be fixed permanently on the choke, for example by molding the sealing means on the choke or using special glues.
  • seals made of flexible materials rigid materials such as metals or hard plastics can also be used.
  • figure 1 schematically represents the end of the side of the mouth 1 of a barrel 2 in which is mounted a choke 3.
  • the choke 3 consists mainly of a bush 4 having a predominantly cylindrical outer surface 5 and an inner surface 6 which forms a passage for the lead, which extends narrowing in the direction of an end 7 of the bushing 4 , more precisely the end 7 facing the muzzle of the barrel 1.
  • This end 7 is provided with mechanical coupling means which, in this case, are in the form of an external screw thread 8 over a certain length of the nozzle 4 and which can cooperate with an internal screw thread.
  • 9 which is provided in the barrel 2, more precisely at the mouth of the barrel 1, the barrel being provided with a housing 10 in the form of a portion of the barrel 2 having an internal diameter D which is greater than internal diameter d of the core 11 of the barrel 2.
  • a tapered beveled portion 13 which extends conically tapering towards the corresponding end 12.
  • the housing 10 of the barrel 2 has a corresponding bevel 14 which extends narrowing in a direction which deviates from the mouth of the barrel 1.
  • the tapered portion 13 of the choke 3 is provided with a constriction 15 in which there are provided sealing means which are in the form of a sealing ring 16 made of elastomer or heat-shrinkable material.
  • the dimensions of the choke 3 and the housing 10 of the barrel 2 are such that one always obtains the presence of a functional clearance 17 between the two.
  • the diameters indicated in figure 1 respectively d1 at the end 7 of the choke 3 and d of the core 11, determine the chokage of the choke 3.
  • the choke 3 is disposed with its conical end 12 in the housing 10 of the barrel 2 and then, as shown in FIG. figure 3 it is screwed in using screw threads 8 and 9, so that the sealing ring 16 is compressed between the beveled portion 13 of the choke 3 and the bevelled portion of the barrel 2, in order to obtain a decisive seal which makes impossible the incrustation of residues of powders when firing a cartridge, in the space provided by the functional clearance 17 between the two parts.
  • the length of the choke is preferably such that, during the priming of the screwing, the sealing ring 16 does not come into contact with the barrel 2.
  • the sealing ring 16 When continuing the screwing, the sealing ring 16 is compressed to be able to play its role of sealing means.
  • tapered portion is, in the example shown, at the end 12 of the nozzle 4, another location for said part is not excluded.
  • FIG. 4 Another embodiment of the invention is represented in the figure 4 and consists in providing choke 3, in addition to a first sealing ring 16 on the soul side, of a second sealing ring 18 on the mouth side.
  • This sealing ring 18 can be made using the same means as those available for producing the first sealing ring 16.
  • This variant has the advantage that after the complete introduction of the choke 3, the penetration of water between the outside of the choke 3 and its housing 10 in the barrel 2 will be impossible, as well as contamination by any parasitic particles that could generate oxidation and adhesion between the barrel 2 and the choke 3.In place of the sealing ring 16, one can also use the variants described earlier, without departing from the scope of the invention.
  • an interchangeable choke 3 for a gun with smooth barrel 2 according to the invention can be implemented in all kinds of shapes and dimensions without departing from the scope of the invention.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Gasket Seals (AREA)
  • Toys (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)

Abstract

The choke (3) has mechanical coupling units e.g. external screw thread (8) and internal screw thread (9), for mounting and dismounting the choke. A supplementary sealing unit provides sealing to the choke with respect to a barelled firearm (2). The sealing unit is realized in form of a packing ring (16) made of a flexible material e.g. rubber, elastomer or thermoretractable material. The sealing unit is realized in form of a piston segment made of a rigid material e.g. metal or hard synthetic material.

Description

La présente invention concerne un choke interchangeable pour une arme à feu à canon lisse.The present invention relates to an interchangeable choke for a smooth-bore firearm.

L'invention concerne plus spécifiquement des armes à feu qui sont destinées à des cartouches à plomb dont la charge, comme il est bien connu, est constituée par une certaine quantité de petites boules ou de petites billes en plomb ou en un autre matériau.More specifically, the invention relates to firearms that are intended for lead cartridges whose charge, as is well known, is a certain amount of small balls or small balls of lead or other material.

Il est connu que lors du tir d'une cartouche, l'impact du plomb présente une certaine dispersion qui augmente de manière proportionnelle à la distance à laquelle a lieu l'impact.It is known that when firing a cartridge, the impact of the lead has a certain dispersion which increases proportionally to the distance at which the impact takes place.

Cette dispersion peut être influencé par l'utilisation de ce que l'on appelle un choke.This dispersion can be influenced by the use of what is called a choke.

L'objet visé par un choke de ce type réside dans le fait d'obtenir une dispersion supérieure ou inférieure du plomb, le choke formant un passage pour le plomb, qui s'étend dans le prolongement de canon et dont le diamètre interne se réduit en direction de la bouche du canon.The object of a choke of this type is to obtain a higher or lower dispersion of the lead, the choke forming a passage for the lead, which extends in the barrel extension and whose inner diameter is reduced towards the mouth of the barrel.

L'allure du passage qui se réduit détermine la mesure de la concentration plus ou moins grande de l'impact du plomb.The pace of the diminishing passage determines the measure of the greater or lesser concentration of the impact of lead.

Plus le passage se rétrécit, plus élevée sera la concentration de l'impact.As the passage narrows, the higher the concentration of the impact.

La différence entre le diamètre interne du canon et le diamètre interne à la bouche est designé par le mot chokage.The difference between the inner diameter of the barrel and the internal diameter at the mouth is designated by the word chokage.

En fonction du type de cible et de la distance s'étendant jusqu'à la cible, un chokage supérieur ou inférieur sera plus indiqué ou désiré.Depending on the type of target and the distance to the target, higher or lower chokage will be more appropriate or desired.

Traditionnellement, on répartit les chokes pour armes à feu en deux familles, ce que l'on appelle les « chokes fixes » et les « chokes interchangeables ».Traditionally, firearms chokes have been divided into two families, so-called "fixed chokes" and "interchangeable chokes".

En ce qui concerne les chokes fixes, le chokage est réalisé dans la masse du canon ; à cet effet, on fait varier le diamètre du canon à la bouche en fonction du chockage souhaité.As for the fixed chokes, the chokage is made in the mass of the barrel; for this purpose, the diameter of the barrel is varied to the mouth according to the desired chockage.

Ces chokes fixes offrent l'avantage de ne pas nécessiter d'entretien supplémentaire.These fixed chokes offer the advantage of not requiring additional maintenance.

Leur inconvénient réside néanmoins dans le fait que le chokage ne peut être modifié de manière réversible en fonction des besoins du tireur.However, their disadvantage lies in the fact that the chokage can not be changed reversibly depending on the needs of the shooter.

On connaît par ailleurs la famille des chokes interchangeables.The family of interchangeable chokes is also known.

Un choke interchangeable comprend une buselure constituée d'acier traité, qui est fixée à l'intérieur de la bouche du canon.An interchangeable choke includes a bushing made of treated steel, which is attached to the inside of the muzzle of the barrel.

Ici encore, le principe du chokage se base sur une réduction du diamètre interne en direction de la bouche du canon.Here again, the principle of chokage is based on a reduction of the internal diameter towards the mouth of the barrel.

L'avantage lié à cette famille réside dans le fait que le chokage peut être facilement adapté aux besoins du tireur en montant un choke possédant une autre configuration du diamètre de sortie ou bien en utilisant un choke à chokage variable.The advantage of this family is that the chokage can be easily adapted to the needs of the shooter by mounting a choke having another configuration of the output diameter or by using a variable choke choke.

Un des inconvénients de ces chokes interchangeables réside dans le fait qu'ils ont tendance à se dévisser lors des tirs.One of the drawbacks of these interchangeable chokes lies in the fact that they tend to unscrew during firing.

Un autre inconvénient de ces chokes interchangeables réside dans le fait qu'ils peuvent se bloquer dans le canon.Another disadvantage of these interchangeable chokes lies in the fact that they can hang in the barrel.

En effet, entre le diamètre externe du choke et son logement dans le canon, on prévoit un jeu fonctionnel indispensable.Indeed, between the outer diameter of the choke and its housing in the barrel, is provided an essential functional game.

Néanmoins, à cause de cela, des résidus de poudre, bourre, plomb, etcetera peuvent pénétrer dans l'espace ménagé entre le choke et le canon, si bien que, au cours du temps, ce dépôt de saleté peut faire en sorte que le choke se bloque dans le canon de l'arme à feu.Nevertheless, because of this, residues of powder, wad, lead, etcetera can penetrate in the space between the choke and the barrel, so that, over time, this deposition of dirt can make that the choke hangs in the barrel of the gun.

Dans ce cas, on doit parfois se résoudre à faire appel à un armurier pour le démontage des pièces ou bien il devient tout à fait impossible de séparer ces dernières sans les abîmer.In this case, we sometimes have to resort to using a gunsmith to disassemble parts or it becomes quite impossible to separate them without damaging them.

Le problème se manifeste surtout dans des réalisations de chokes qui présentent un filet de vis externe par lequel le choke peut être vissé dans le logement du canon, ce logement étant muni à cet effet d'un filet de vis correspondant. Du fait que l'on privilégie la plupart du temps un filet de vis fin, ce mécanisme représente un point délicat du choke vissé.The problem is manifested especially in chokes embodiments which have an external screw thread through which the choke can be screwed into the housing of the barrel, this housing being provided for this purpose with a corresponding screw thread. Since most of the time a fine screw thread is favored, this mechanism represents a delicate point of the screwed choke.

La présente invention a pour objet d'apporter une solution à un ou plusieurs des inconvénients précités ainsi qu'à d'autres.The present invention aims to provide a solution to one or more of the aforementioned drawbacks as well as others.

À cet effet, l'invention concerne un choke interchangeable pour une arme à feu à canon lisse, ce choke étant muni de moyens d'accouplement mécaniques pour le montage et le démontage du choke, caractérisé en ce que le choke est muni de moyens d'étanchéité supplémentaires afin de conférer au choke, au moins à un endroit, une étanchéité par rapport au canon.For this purpose, the invention relates to an interchangeable choke for a smooth-bore firearm, said choke being provided with mechanical coupling means for the assembly and disassembly of the choke, characterized in that the choke is provided with means for additional sealing to give the choke, at least in one place, a seal relative to the barrel.

Un avantage lié à l'utilisation des moyens d'étanchéité réside dans le fait que le choke n'a pratiquement pas la possibilité de se bloquer dans sa position de montage étant donné que ces moyens font en sorte que la saleté, principalement des résidus de poudre, bourre ou plomb n'auront pas à la possibilité de se déposer entre le choke et le logement du choke dans le canon, si bien que le choke, même après des sessions de tirs de longue durée, peut être démonté sans problème.An advantage associated with the use of the sealing means lies in the fact that the choke has practically no possibility of locking in its mounting position since these means make the dirt, mainly residues of powder, wad or lead will not have the opportunity to settle between the choke and the housing of the choke in the barrel, so that the choke, even after long shooting sessions, can be dismounted without problem.

Un avantage supplémentaire qui s'oppose au dépôt des saletés réside dans le fait que l'on facilite l'entretien du choke et du canon, si bien que l'on peut se passer de l'intervention d'un spécialiste en armement.An additional advantage to the deposition of dirt is that it facilitates the maintenance of the choke and the barrel, so that we can do without the intervention of a specialist armament.

Traditionnellement, les moyens d'accouplement mécaniques mentionnés sont réalisés sous la forme d'une liaison à filet de vis.Traditionally, the mechanical coupling means mentioned are made in the form of a screw thread connection.

Bien que d'autres formes de réalisation de l'invention ne soient pas exclues, on partira, dans la description ultérieure, de la présente forme de réalisation.Although other embodiments of the invention are not excluded, the following description will depart from the present embodiment.

Les avantages mentionnés ci-dessus s'appliquent également à la présente forme de réalisation. De manière plus spécifique, l'invention offre une protection décisive contre le blocage du choke dans le cas d'un choke vissé comprenant un filet de vis fin.The above mentioned advantages also apply to the present embodiment. More specifically, the invention offers a decisive protection against choke blockage in the case of a screw choke comprising a fine screw thread.

Dans une forme de réalisation préférée, l'étanchéité est garantie par un anneau d'étanchéité, en élastomère ou en un autre matériau souple ou thermorétractable, qui vient s'appliquer dans une striction pratiquée dans la surface externe du choke.In a preferred embodiment, the seal is guaranteed by a sealing ring, made of elastomer or other flexible or heat-shrinkable material, which is applied in a constriction made in the outer surface of the choke.

Un avantage lié à cette forme de réalisation réside dans le fait que le choke n'a pratiquement pas la possibilité de se dévisser au cours du tir. Les forces de friction, qui résultent de la mise en contact avec l'anneau d'étanchéité comprimé, vont au bout du compte générer un couple de forces qui s'oppose au couple de forces requis pour le démontage du choke.An advantage of this embodiment lies in the fact that the choke has practically no opportunity to unscrew during the shot. The frictional forces that result from contacting the compressed sealing ring ultimately result in a torque that opposes the force torque required to disassemble the choke.

Grâce à l'application de l'anneau d'étanchéité dans une striction de la surface externe, on empêche un déplacement de l'anneau d'étanchéité lors de l'insertion du choke dans le canon.By applying the sealing ring in a necking of the outer surface, it prevents a displacement of the sealing ring during the insertion of the choke into the barrel.

En variante, les moyens d'étanchéité peuvent être fixés à demeure sur le choke, par exemple par moulage des moyens d'étanchéité sur le choke ou bien en utilisant des colles spéciales.Alternatively, the sealing means can be fixed permanently on the choke, for example by molding the sealing means on the choke or using special glues.

Au lieu de réaliser les étanchéités en matériaux souples, on peut également utiliser des matériaux rigides tels que des métaux ou des matières synthétiques dures.Instead of seals made of flexible materials, rigid materials such as metals or hard plastics can also be used.

Lorsqu'on utilise ce type de matériau, on peut réaliser par exemple les étanchéités sous la forme d'un segment de piston conformément au principe mis en oeuvre pour l'étanchéité des cylindres dans un moteur à combustion.When this type of material is used, it is possible, for example, to produce the seals in the form of a piston ring in accordance with the principle used for sealing the cylinders in a combustion engine.

Dans le but de mieux indiquer les caractéristiques de l'invention, on décrit ci-après, à titre d'exemple et sans aucun caractère limitatif, une forme de réalisation préférée d'un choke interchangeable selon l'invention pour une arme à feu à canon lisse, en se référant aux dessins annexés dans lesquels :

  • la figure 1 représente, de manière schématique et dans une vue en coupe, un choke interchangeable selon l'invention, monté dans le canon d'une arme à feu à canon lisse ;
  • la figure 2 représente, à une plus grande échelle, la partie représentée par F2 en figure 1 ;
  • la figure 3 représente une vue analogue à celle de la figure 1, mais par laquelle on représente le choke à l'état partiellement démonté.
  • la figure 4 représente une vue analogue à celle de la figure 1, mais pour une configuration comprennant deux anneaux d'étanchéité
In order to better indicate the characteristics of the invention, an embodiment of the invention is described below, by way of example and without any limiting character, preferred embodiment of an interchangeable choke according to the invention for a smooth-bore firearm, with reference to the accompanying drawings in which:
  • the figure 1 schematically shows in sectional view an interchangeable choke according to the invention mounted in the barrel of a smooth-bore firearm;
  • the figure 2 represents, on a larger scale, the part represented by F2 in figure 1 ;
  • the figure 3 represents a view similar to that of the figure 1 , but by which we represent the choke in the partially disassembled state.
  • the figure 4 represents a view similar to that of the figure 1 , but for a configuration comprising two sealing rings

Le fonctionnement du dispositif est très simple et tel qu'indiqué ci-après.The operation of the device is very simple and as indicated below.

En figure 1, on représente de manière schématique l'extrémité du côté de la bouche 1 d'un canon 2 dans lequel est monté un choke 3.In figure 1 , schematically represents the end of the side of the mouth 1 of a barrel 2 in which is mounted a choke 3.

Le choke 3 est constitué principalement d'une buselure 4 possédant une surface externe 5 principalement cylindrique et une surface interne 6 qui forme un passage pour le plomb, qui s'étend en se rétrécissant dans la direction d'une extrémité 7 de la buselure 4, plus précisément l'extrémité 7 orientée vers la bouche du canon 1.The choke 3 consists mainly of a bush 4 having a predominantly cylindrical outer surface 5 and an inner surface 6 which forms a passage for the lead, which extends narrowing in the direction of an end 7 of the bushing 4 , more precisely the end 7 facing the muzzle of the barrel 1.

Cette extrémité 7 est munie de moyens d'accouplement mécaniques qui, dans ce cas-ci, sont réalisés sous la forme d'un filet de vis externe 8 sur une certaine longueur de la buselure 4 et qui peuvent coopérer avec un filet de vis interne 9 qui est prévu dans le canon 2, plus précisément à l'endroit de la bouche du canon 1, le canon étant muni d'un logement 10 sous la forme d'une partie du canon 2 possédant un diamètre interne D qui est supérieur au diamètre interne d de l'âme 11 du canon 2.This end 7 is provided with mechanical coupling means which, in this case, are in the form of an external screw thread 8 over a certain length of the nozzle 4 and which can cooperate with an internal screw thread. 9 which is provided in the barrel 2, more precisely at the mouth of the barrel 1, the barrel being provided with a housing 10 in the form of a portion of the barrel 2 having an internal diameter D which is greater than internal diameter d of the core 11 of the barrel 2.

À l'autre extrémité 12 du choke 3, plus précisément l'extrémité 12 orientée vers l'intérieur, on prévoit une partie 13 biseautée en cône, qui s'étend en se rétrécissant en cône en direction de l'extrémité correspondant 12.At the other end 12 of the choke 3, more precisely the end 12 facing inwards, there is provided a tapered beveled portion 13 which extends conically tapering towards the corresponding end 12.

Le logement 10 du canon 2 présente un biseau correspondant 14 qui s'étend en se rétrécissant dans une direction qui s'écarte de la bouche du canon 1.The housing 10 of the barrel 2 has a corresponding bevel 14 which extends narrowing in a direction which deviates from the mouth of the barrel 1.

La partie biseautée 13 du choke 3 est munie d'une striction 15 dans laquelle on prévoit des moyens d'étanchéité qui sont réalisés sous la forme d'un anneau d'étanchéité 16 en élastomère ou matériau thermorétractable.The tapered portion 13 of the choke 3 is provided with a constriction 15 in which there are provided sealing means which are in the form of a sealing ring 16 made of elastomer or heat-shrinkable material.

Les dimensions du choke 3 et du logement 10 du canon 2 sont telles que l'on obtient toujours la présence d'un jeu fonctionnel 17 entre les deux.The dimensions of the choke 3 and the housing 10 of the barrel 2 are such that one always obtains the presence of a functional clearance 17 between the two.

Les diamètres indiqués en figure 1, respectivement d1 à l'extrémité 7 du choke 3 et d de l'âme 11, déterminent le chokage du choke 3.The diameters indicated in figure 1 , respectively d1 at the end 7 of the choke 3 and d of the core 11, determine the chokage of the choke 3.

L'utilisation d'un choke 3 selon l'invention est très simple et telle qu'indiquée ci-après.The use of a choke 3 according to the invention is very simple and as indicated below.

Le choke 3 vient se disposer avec son extrémité conique 12 dans le logement 10 du canon 2 et ensuite, comme représenté en figure 3, y est vissé en faisant usage des filets de vis 8 et 9, si bien que l'anneau d'étanchéité 16 est comprimé entre la partie biseautée 13 du choke 3 et la partie biseautée du canon 2, afin d'obtenir une étanchéité décisive qui rend impossible l'incrustation de résidus de poudres à canon lors du tir d'une cartouche, dans l'espace ménagé par le jeu fonctionnel 17 entre les deux pièces détachées.The choke 3 is disposed with its conical end 12 in the housing 10 of the barrel 2 and then, as shown in FIG. figure 3 it is screwed in using screw threads 8 and 9, so that the sealing ring 16 is compressed between the beveled portion 13 of the choke 3 and the bevelled portion of the barrel 2, in order to obtain a decisive seal which makes impossible the incrustation of residues of powders when firing a cartridge, in the space provided by the functional clearance 17 between the two parts.

Grâce aux parties biseautées correspondantes 13 et 14, on facilite le centrage du choke 3 lors de son montage, et on simplifie l'amorçage de la liaison à visser formée par les filets de vis 8 et 9.Thanks to the corresponding beveled portions 13 and 14, the centering of the choke 3 is facilitated during its assembly, and the initiation of the screw connection formed by the screw threads 8 and 9 is simplified.

La longueur du choke est de préférence telle que, lors de l'amorçage du vissage, l'anneau d'étanchéité 16 n'entre pas en contact avec le canon 2.The length of the choke is preferably such that, during the priming of the screwing, the sealing ring 16 does not come into contact with the barrel 2.

Par conséquent, dans cette phase d'amorçage, on n'est pas confronté à des forces émanant d'une mise en contact entre l'anneau d'étanchéité en 16 et le canon 2, si bien que la première partie du montage se déroule en toute simplicité.Therefore, in this priming phase, one does not face forces emanating from a contact between the sealing ring 16 and the barrel 2, so that the first part of the assembly takes place with ease.

Dans la deuxième phase, c'est après avoir déjà suffisamment vissé le choke 3 et le canon 2 l'un dans l'autre pour garantir une bonne liaison que l'on met l'anneau d'étanchéité 16 en contact avec le canon 2.In the second phase, it is after having already sufficiently screwed the choke 3 and the barrel 2 into each other to ensure a good connection that is placed the sealing ring 16 in contact with the barrel 2 .

Lors de la poursuite du vissage, l'anneau d'étanchéité 16 est comprimé pour pouvoir jouer son rôle de moyen d'étanchéité.When continuing the screwing, the sealing ring 16 is compressed to be able to play its role of sealing means.

Lors d'une session de tir, l'étanchéité ainsi réalisée va empêcher la pénétration de résidus de poudre à travers cet anneau d'étanchéité 16. Par conséquent, la liaison sensible par filet de vis 8-9 et l'espace ménagé pour le jeu fonctionnel 17 restent à l'abri d'un dépôt de saleté.During a firing session, the seal thus produced will prevent the penetration of powder residues through this sealing ring 16. Therefore, the sensitive connection by screw thread 8-9 and the space provided for the functional play 17 remain safe from a dirt deposit.

Ainsi, on obtient une possibilité de démontage sans problème et on limite l'entretien nécessaire.Thus, we obtain a possibility of disassembly without problems and we limit the necessary maintenance.

Il est clair que les parties biseautées 13 et 14 ne sont pas strictement nécessaires pour l'invention et que par exemple une buselure 4 qui présente une configuration cylindrique sur toute sa longueur rentre également dans le domaine de protection de l'invention ; dans ce cas, on peut prévoir une étanchéité dans une striction 15 de la surface externe cylindrique 5 ou bien dans évidement de la surface à l'extrémité de la buselure 4.It is clear that the bevelled portions 13 and 14 are not strictly necessary for the invention and that for example a nozzle 4 which has a cylindrical configuration over its entire length also falls within the scope of protection of the invention; in this case, we can provide a sealing in a constriction 15 of the cylindrical outer surface 5 or in recess of the surface at the end of the bushing 4.

Bien que la partie biseautée se trouve, dans l'exemple représenté, à l'extrémité 12 de la buselure 4, un autre endroit pour ladite partie n'est pas exclu.Although the tapered portion is, in the example shown, at the end 12 of the nozzle 4, another location for said part is not excluded.

La position des moyens d'accouplement mécaniques et des moyens d'étanchéité peut être modifiée par rapport à celle que l'on utilise dans cet exemple, sans sortir du cadre de l'invention.The position of the mechanical coupling means and the sealing means can be modified with respect to that used in this example, without departing from the scope of the invention.

Une autre forme de réalisation de l'invention est représentée dans la figure 4 et consiste à munir le choke 3, en plus d'un premier anneau d'étanchéité 16 du côté âme, d'un deuxième anneau d'étanchéité 18 du côté bouche. Cet anneau d'étanchéité 18 peut être realisé à l'aide des mêmes moyens que ceux qui sont disponibles pour la réalisation du premier anneau d'étanchéité 16.Another embodiment of the invention is represented in the figure 4 and consists in providing choke 3, in addition to a first sealing ring 16 on the soul side, of a second sealing ring 18 on the mouth side. This sealing ring 18 can be made using the same means as those available for producing the first sealing ring 16.

Cette variante présente l'avantage qu' après l'introduction complète du choke 3, la pénétration d'eau entre l'extérieur du choke 3 et son logement 10 dans le canon 2 sera impossible, ainsi que la contamination par toutes particules parasites qui pourraient générer de l'oxydation et de l'adhérence entre le canon 2 et le choke 3.À la place de l'anneau d'étanchéité 16, on peut également utiliser les variantes décrites plus tôt, sans sortir du cadre de l'invention.This variant has the advantage that after the complete introduction of the choke 3, the penetration of water between the outside of the choke 3 and its housing 10 in the barrel 2 will be impossible, as well as contamination by any parasitic particles that could generate oxidation and adhesion between the barrel 2 and the choke 3.In place of the sealing ring 16, one can also use the variants described earlier, without departing from the scope of the invention.

La présente invention n'est en aucune manière limitée à la forme de réalisation décrite à titre d'exemple et représentée dans les figures ; un choke 3 interchangeable pour une arme à feu à canon 2 lisse selon l'invention peut être mis en oeuvre dans toutes sortes de formes et de dimensions sans sortir du cadre de l'invention.The present invention is in no way limited to the embodiment described by way of example and shown in the figures; an interchangeable choke 3 for a gun with smooth barrel 2 according to the invention can be implemented in all kinds of shapes and dimensions without departing from the scope of the invention.

Il en sera de même pour le logement 10 du choke 3 dans le canon 2.It will be the same for the housing 10 of choke 3 in the barrel 2.

De même, que l'alternative qui consisterait à fixer l'anneau d'étanchéité 16 dans le logement 10 du choke 3 situé dans le canon 2, entre également dans le cadre de l'invention.Similarly, that the alternative of attaching the sealing ring 16 in the housing 10 of the choke 3 located in the barrel 2, is also within the scope of the invention.

Claims (13)

Choke (3) interchangeable pour une arme à feu à canon (2) lisse, ce choke (3) étant muni de moyens d'accouplement mécaniques (8-9) pour le montage et le démontage du choke (3), caractérisé en ce que le choke (3) est muni de moyens d'étanchéité (16) supplémentaires afin de conférer au choke (3), au moins à un endroit, une étanchéité par rapport au canon (2).Choke (3) interchangeable for a smooth gun (2), the choke (3) being provided with mechanical coupling means (8-9) for mounting and dismounting the choke (3), characterized in that that the choke (3) is provided with additional sealing means (16) to give the choke (3), at least in one place, a seal relative to the barrel (2). Choke (3) interchangeable selon la revendication 1, caractérisé en ce que les moyens d'accouplement mécanique (8-9) mentionnés sont réalisés sous la forme d'un filet de vis.Choke (3) interchangeable according to claim 1, characterized in that the mechanical coupling means (8-9) mentioned are made in the form of a screw thread. Choke (3) interchangeable selon la revendication 1 ou 2, caractérisé en ce que les moyens d'étanchéité (16) mentionnés sont réalisés à l'aide d'un anneau d'étanchéité en un matériau souple comme par exemple le caoutchoux, élastomère ou matériau thermorétractable.Choke (3) interchangeable according to claim 1 or 2, characterized in that the sealing means (16) mentioned are made using a sealing ring of a flexible material such as rubber, elastomer or heat-shrinkable material. Choke (3) interchangeable selon la revendication 1 ou 2, caractérisé en ce que les moyens d'étanchéité (16) mentionnés sont réalisés à l'aide d'un segment de piston en un matériau rigide comme par exemple du métal ou une matière synthétique dure.Choke (3) interchangeable according to claim 1 or 2, characterized in that the sealing means (16) mentioned are made using a piston ring of a rigid material such as for example metal or a synthetic material tough. Choke (3) interchangeable selon l'une quelconque des revendications précédentes, caractérisé en ce que les moyens d'étanchéité (16) sont appliqués à demeure sur la buselure (4) du choke par exemple par moulage.Choke (3) interchangeable according to any one of the preceding claims, characterized in that the sealing means (16) are permanently applied to the bushing (4) choke for example by molding. Choke (3) interchangeable selon l'une quelconque des revendications précédentes, caractérisé en ce que les moyens d'étanchéité (16) sont appliqués en pratiquant une striction dans la surface externe (15) du choke (3).Choke (3) interchangeable according to any one of the preceding claims, characterized in that the sealing means (16) are applied by making a necking in the outer surface (15) of the choke (3). Choke (3) interchangeable selon la revendication 6, caractérisé en ce que la striction (15) est prévue à l'endroit d'une partie biseautée (13) de la buselure (4).Choke (3) interchangeable according to claim 6, characterized in that the necking (15) is provided at the location of a tapered portion (13) of the bushing (4). Choke (3) interchangeable selon la revendication 7, caractérisé en ce que la partie biseautée (13) présente un rétrécissement en cône.Choke (3) interchangeable according to claim 7, characterized in that the tapered portion (13) has a tapered cone. Choke (3) interchangeable selon l'une quelconque des revendications précédentes, caractérisé en ce que les moyens d'accouplement mécaniques (8-9) sont prévus à une extrémité de la buselure (4) et les moyens d'étanchéité (16) sont prévus à l'autre extrémité de la buselure (4).Choke (3) interchangeable according to any one of the preceding claims, characterized in that the mechanical coupling means (8-9) are provided at one end of the nozzle (4) and the sealing means (16) are provided at the other end of the bush (4). Choke (3) interchangeable selon l'une quelconque des revendications précédentes, caractérisé en ce que les moyens d'étanchéité (16 et 18) sont prévus aux deux extrémités (7 et 12) de la buselure (4).Choke (3) interchangeable according to any one of the preceding claims, characterized in that the sealing means (16 and 18) are provided at both ends (7 and 12) of the bushing (4). Choke (3) interchangeable selon l'une quelconque des revendications précédentes, caractérisé en ce que les moyens d'accouplement mécaniques (8-9) mentionnés sont réalisés à la manière d'une liaison par filet de vis, si bien que, lors de l'amorçage du vissage du choke (3) dans le canon (2), les moyens d'étanchéité (16) n'entrent pas en contact avec le canon (2).Choke (3) interchangeable according to any one of the preceding claims, characterized in that the mechanical coupling means (8-9) mentioned are made in the manner of a connection by screw thread, so that, when priming the screwing of the choke (3) in the barrel (2), the sealing means (16) do not enter into contact with the barrel (2). Choke (3) interchangeable selon l'une quelconque des revendications précédentes, caractérisé en ce que le choke (3), sur sa surface externe (5), et le logement (10) pour le choke (3) dans le canon (2), sont réalisés avec une configuration cylindrique sur toute leur longueur.Choke (3) interchangeable according to any one of the preceding claims, characterized in that the choke (3) on its outer surface (5) and the housing (10) for the choke (3) in the barrel (2) , are made with a cylindrical configuration over their entire length. Arme à feu à canon (2) lisse, caractérisé en ce qu'elle est munie d'un choke (3) interchangeable selon l'une quelconque des revendications précédentes.Gun with smooth barrel (2), characterized in that it is provided with a choke (3) interchangeable according to any one of the preceding claims.
EP09447034.1A 2008-08-28 2009-08-06 Interchangeable choke for a smooth bore firearm Active EP2159530B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE2008/0476A BE1018272A3 (en) 2008-08-28 2008-08-28 INTERCHANGEABLE CHOKE FOR A SMOOTH CANON FIREARM.

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EP2159530A1 true EP2159530A1 (en) 2010-03-03
EP2159530B1 EP2159530B1 (en) 2015-03-11

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EP09447034.1A Active EP2159530B1 (en) 2008-08-28 2009-08-06 Interchangeable choke for a smooth bore firearm

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US (1) US8186091B2 (en)
EP (1) EP2159530B1 (en)
JP (1) JP5226631B2 (en)
BE (1) BE1018272A3 (en)
ES (1) ES2534906T3 (en)

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EP2647944A1 (en) 2012-04-05 2013-10-09 BreveX SA Device for increasing the speed of shot ammunition for a smooth barrel firearm

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IT201600117919A1 (en) * 2016-11-22 2018-05-22 Fabbrica Darmi Pietro Beretta S P A DEVICE FOR EXTENDING A FIRE WEAPON
US20190316862A1 (en) 2018-01-23 2019-10-17 American Defense Manufacturing, Llc Firearm supressor system and associated quick release mount and lock
US10612878B1 (en) 2018-09-06 2020-04-07 Savage Arms, Inc. Muzzle device, firearm barrel, and method of attachment

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Also Published As

Publication number Publication date
US8186091B2 (en) 2012-05-29
US20100050493A1 (en) 2010-03-04
ES2534906T3 (en) 2015-04-30
JP5226631B2 (en) 2013-07-03
JP2010060273A (en) 2010-03-18
BE1018272A3 (en) 2010-08-03
EP2159530B1 (en) 2015-03-11

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