EP0717253B1 - Obturator for caseless ammunition firearm - Google Patents
Obturator for caseless ammunition firearm Download PDFInfo
- Publication number
- EP0717253B1 EP0717253B1 EP95402532A EP95402532A EP0717253B1 EP 0717253 B1 EP0717253 B1 EP 0717253B1 EP 95402532 A EP95402532 A EP 95402532A EP 95402532 A EP95402532 A EP 95402532A EP 0717253 B1 EP0717253 B1 EP 0717253B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- seal
- barrel
- sealing
- sealing device
- breech
- Prior art date
- 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.)
- Expired - Lifetime
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Classifications
-
- 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
- F41A3/00—Breech mechanisms, e.g. locks
- F41A3/64—Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
- F41A3/74—Obturating or packing devices for gas leak prevention in breech mechanisms
Definitions
- the technical field of the present invention is that small arms small arms firing ammunition without socket.
- EP251902 and US3799560 describe various types of gun shutters. These shutters have a specific structure of a given weapon type: EP251902 and GB2233747 are suitable for large caliber barrels with breech corner and US3799560 is specific to chamber weapons multiple. These complex shutters cannot be used for a small caliber ammunition weapon without a case and they also do not solve the problem of the heating of the sealing device encountered in such weapons.
- the object of the present invention is therefore to provide a device for sealing the combustion gases of a munition without a socket ensuring this seal for an instantaneous temperature of the order of 2500 ° C. and a pressure of approximately 5.10 7 Pa.
- Another object of the present invention is to provide a sealing device, the cooling of which limits its warming up for bursts of ammunition of around 150 in a minute.
- the invention therefore relates to a sealing device to the combustion gases of a munition without socket, mounted between the barrel and the breech chamber of a firearm small caliber, and including a seal which consists of a sealing part of annular shape, one face of which end forms an axial sealing surface intended for come to bear on the rear face of the barrel, and which comprises towards its other end a radial sealing lip intended to bear on the internal wall of the chamber cylinder head, device characterized in that the gasket also includes a cooling section which extends axially over a length greater than that of the part sealing to limit the heating of the latter which is in contact with the combustion gases.
- the seal is floatingly attached between the barrel and the breech of so that it can move axially under the action of the combustion gas pressure.
- the part joint cooling is annular, coaxial externally to the sealing part of the joint and connected to the periphery of the latter by an annular radial wall.
- the axial position of the connecting wall between the two parts of the seal is such that, on the barrel side, the sealing part, the cooling part and the joint connection wall delimit between them a gas decompression cavity combustion.
- the cooling part of the seal is intended to be housed in an annular space delimited between the rear part of the barrel and the breech, and is used to ensure the floating fixing of the joint.
- the cooling part of the gasket is fixed to the cylinder head by at least one connecting means freely engaging inside an oblong opening formed in the wall of the cooling part of the seal, this connecting means being for example a screw, the head of which East blocked by the cylinder head and whose rod engages in the aforementioned opening.
- the two sealing parts and cooling which form the joint form a part monobloc which is made of spring steel, by example.
- An advantage of the sealing device according to the invention resides in the fact that the seal is provided by a single piece device facilitating its manufacture and its mounting in the weapon and consequently its replacement in the event of deterioration.
- Another advantage is the use of the combustion gas pressure to ensure the displacement of the sealing device and its deformation.
- Weapon 1 partially shown in section longitudinal in Figure 1 includes an aligned barrel with cylinder head 3 in chamber 3a of which is housed ammunition 4 without casing consisting of a charge propellant 5 and a projectile 6 engaged in the barrel.
- Ammunition 4 is fired using a device initiation 7 electric or percussion.
- Canon 2 and the cylinder head 3 are fixed to each other using a cylinder head lock 8.
- the cylinder head 3 is subjected to the action a recovery spring 9 which applies to the cylinder head 3 an axial force F.
- the cooling part 15 of the seal 11 is annular in shape, coaxial outside the part seal 12 and connected to the periphery of the latter by an annular radial wall 16.
- the axial position of the connecting wall 16 is such that, on the barrel side, the sealing part 12, cooling part 15 and the connecting wall 16 delimit between them a cavity 17 decompression of combustion gases.
- the cooling part 15 extends in the same side of the connecting wall 16 and towards canon 2.
- the seal 11 is made of a material elastically deformable with thermomechanical properties high temperatures and a wide range of operating, between - 50 ° and 450 °, this material being for example a spring steel.
- the sealing part 12 of the seal 11 has an outside diameter of the order of 13 mm, extends over a length of 5.5 mm, the lip having a thickness of the order of 0.4 mm, the cooling part 14 extends over a length of the order of 9 mm and has a thickness of the order of 3.7 mm, and the cavity of decompression has a width of the order of 2.5 mm.
- the part cooling 15 extends axially over a length greater than that of the sealing part 12, so as to allow cooling of the seal 11 by limiting the heating of the sealing part 12 which is directly in contact with the combustion gases, so that its temperature remains below the temperature of income from the constituent steel.
- the part cooling 15 of the seal 11 is intended to be housed in an annular space 18 delimited between the part rear of the barrel 2 and the breech 3.
- the seal 11 is intended to be mounted pre-clamped between the barrel 2 and the cylinder head 3 on the one hand, and floatingly attached to ability to move axially under the action of combustion.
- the floating mounting of the seal 11 allows guarantee its positioning between the barrel 2 and the cylinder head 3 when the pressure builds up in the bedroom 3a.
- the seal 11 is fixed to the cylinder head 3 by at least one engaging means 20 engaging freely inside an oblong opening 22 formed in the wall of the cooling part 15 of the joint 11.
- This connecting means 20 is for example constituted by a screw, the head 20a of which is locked in the cylinder head 3, while its rod 20b engages freely in the opening 22.
- Seal 11 is mounted pre-clamped between the barrel 2 and the breech 3 by the action of the recovery spring 9 which acts on the cylinder head 3, so that its axial end surface 13 is in support against the rear face 2a of the barrel 2 but with presence of a minimum radial clearance Jr between the lip sealing 14 and the internal wall of chamber 3a.
- the elastic deformation of the seal 11 will allow it to be applied intimately under the effect of the pressure of the combustion gases against the barrel 2 by axial plating of the surface 13 of the sealing part 12 and against the wall of the chamber 3a by elastic deformation of the lip 14. More precisely, after ignition of the propellant charge 5, the pressure increases in the chamber 3a and the seal 11 passes through two successive phases from the initial position shown in FIG. 3 At the start of the shot, as shown in FIG. 4, the pressure passes through a value P0 of 4.10 7 Pa, called pressing pressure, at which the radial clearance Jr for mounting the seal 11 in the chamber 3a is eliminated by elastic deformation of the lip 14 which is pressed against the internal wall of the chamber 3a.
- the pressure reaches its maximum value, of the order of 5.10 7 Pa, the temperature its maximum value, approximately 2500 ° C, and as shown in Figure 5, the seal 11, the barrel 2 and the cylinder head 3 are deformed uniformly.
- the seal 11 slides in its housing opening 22 and maintains the radial and axial seals by elastic deformation of the sealing part subjected directly to the action of the combustion gases.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Portable Nailing Machines And Staplers (AREA)
- Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
- Installation Of Indoor Wiring (AREA)
- Secondary Cells (AREA)
- Gasket Seals (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
Le domaine technique de la présente invention est celui des armes portatives de petit calibre tirant des munitions sans douille.The technical field of the present invention is that small arms small arms firing ammunition without socket.
Dans les armes classiques, c'est à dire pour les armes tirant des munitions à douille, le problème de l'étanchéité entre le canon et la culasse ne se pose pas étant donné que c'est la douille qui assure directement cette étanchéité par son expansion (déformation plastique) sous l'effet de la pression des gaz de combustion produits par la charge propulsive. La douille métallique ou en matière plastique vient se plaquer contre la paroi de la chambre prolongeant le canon. On sait que dans une arme de guerre de petit calibre, la pression développée dans la chambre est de l'ordre de 5.107 Pa et la température instantanée des gaz d'environ 2500°C.In conventional weapons, that is to say for weapons firing shell ammunition, the problem of tightness between the barrel and the breech does not arise since it is the sleeve which directly ensures this tightness by its expansion (plastic deformation) under the effect of the pressure of the combustion gases produced by the propellant charge. The metal or plastic sleeve is pressed against the wall of the chamber extending the barrel. We know that in a small caliber weapon of war, the pressure developed in the chamber is of the order of 5.10 7 Pa and the instantaneous temperature of the gases of approximately 2500 ° C.
L'utilisation de munitions sans douille ou à douille combustible impose alors la présence d'un dispositif d'étanchéité au niveau de la culasse et du canon.The use of ammunition without casing or casing fuel then requires the presence of a device seal at the breech and barrel.
Le brevet US3762328 décrit un tel dispositif d'étanchéité et sert de base au préambule de la revendication principale. Un tel obturateur est réalisé en matière plastique et ne sert qu'une fois. Il ne peut assurer l'étanchéité pour les contraintes de températures et de pression rencontrées dans une arme de petit calibre tirant en rafale.US Pat. No. 3,762,328 describes such a sealing device and forms the basis of the preamble to the main claim. Such a shutter is made of plastic and does not serves only once. It cannot seal for temperature and pressure constraints encountered in a small caliber weapon firing in burst.
Les brevets GB2233747, EP251902 et US3799560 décrivent divers types d'obturateurs pour arme. Ces obturateurs ont une structure spécifique d'un type d'arme donnée : EP251902 et GB2233747 sont adaptés aux canons de gros calibre à culasse à coin et US3799560 est spécifique des armes à chambres multiples. Ces obturateurs complexes ne sont pas utilisables pour une arme de petit calibre à munition sans douille et ils ne permettent pas non plus de résoudre le problème de l'échauffement du dispositif d'étanchéité rencontré dans de telles armes.The patents GB2233747, EP251902 and US3799560 describe various types of gun shutters. These shutters have a specific structure of a given weapon type: EP251902 and GB2233747 are suitable for large caliber barrels with breech corner and US3799560 is specific to chamber weapons multiple. These complex shutters cannot be used for a small caliber ammunition weapon without a case and they also do not solve the problem of the heating of the sealing device encountered in such weapons.
Le but de la présente invention est donc de fournir un dispositif d'étanchéité aux gaz de combustion d'une munition sans douille assurant cette étanchéité pour une température instantanée de l'ordre de 2500°C et une pression d'environ 5.107 Pa.The object of the present invention is therefore to provide a device for sealing the combustion gases of a munition without a socket ensuring this seal for an instantaneous temperature of the order of 2500 ° C. and a pressure of approximately 5.10 7 Pa.
Un autre but de la présente invention est de proposer un dispositif d'étanchéité, dont le refroidissement limite son échauffement pour des rafales de munitions de l'ordre de 150 en une minute.Another object of the present invention is to provide a sealing device, the cooling of which limits its warming up for bursts of ammunition of around 150 in a minute.
L'invention a donc pour objet un dispositif d'étanchéité aux gaz de combustion d'une munition sans douille, monté entre le canon et la chambre de culasse d'une arme à feu de petit calibre, et comprenant un joint qui est constitué d'une partie étanchéité de forme annulaire, dont une face d'extrémité forme une surface d'étanchéité axiale destinée à venir en appui sur la face arrière du canon, et qui comporte vers son autre extrémité une lèvre d'étanchéité radiale destinée à venir en appui sur la paroi interne de la chambre de culasse, dispositif caractérisé en ce que le joint comprend également une partie refroidissement qui s'étend axialement sur une longueur supérieure à celle de la partie étanchéité pour limiter l'échauffement de cette dernière qui est au contact des gaz de combustion.The invention therefore relates to a sealing device to the combustion gases of a munition without socket, mounted between the barrel and the breech chamber of a firearm small caliber, and including a seal which consists of a sealing part of annular shape, one face of which end forms an axial sealing surface intended for come to bear on the rear face of the barrel, and which comprises towards its other end a radial sealing lip intended to bear on the internal wall of the chamber cylinder head, device characterized in that the gasket also includes a cooling section which extends axially over a length greater than that of the part sealing to limit the heating of the latter which is in contact with the combustion gases.
Selon une autre caractéristique de l'invention, le joint est fixé de manière flottante entre le canon et la culasse de manière à pouvoir se déplacer axialement sous l'action de la pression des gaz de combustion.According to another characteristic of the invention, the seal is floatingly attached between the barrel and the breech of so that it can move axially under the action of the combustion gas pressure.
Selon un exemple de réalisation, la partie refroidissement du joint est de forme annulaire, coaxiale extérieurement à la partie étanchéité du joint et relié à la périphérie de cette dernière par une paroi radiale annulaire.According to an exemplary embodiment, the part joint cooling is annular, coaxial externally to the sealing part of the joint and connected to the periphery of the latter by an annular radial wall.
Selon encore une autre caractéristique de l'invention, la position axiale de la paroi de liaison entre les deux parties du joint est telle que, côté canon, la partie étanchéité, la partie refroidissement et la paroi de liaison du joint délimitent entre elles une cavité de décompression des gaz de combustion.According to yet another characteristic of the invention, the axial position of the connecting wall between the two parts of the seal is such that, on the barrel side, the sealing part, the cooling part and the joint connection wall delimit between them a gas decompression cavity combustion.
D'une manière générale, la partie refroidissement du joint est destinée à se loger dans un espace annulaire délimité entre la partie arrière du canon et la culasse, et est utilisée pour assurer la fixation flottante du joint. In general, the cooling part of the seal is intended to be housed in an annular space delimited between the rear part of the barrel and the breech, and is used to ensure the floating fixing of the joint.
D'une manière générale, la partie refroidissement du joint est fixée à la culasse par au moins un moyen de liaison s'engageant librement à l'intérieur d'une ouverture oblongue ménagée dans la paroi de la partie refroidissement du joint, ce moyen de liaison étant par exemple une vis, dont la tête est bloquée par la culasse et dont la tige s'engage dans l'ouverture précitée.In general, the cooling part of the gasket is fixed to the cylinder head by at least one connecting means freely engaging inside an oblong opening formed in the wall of the cooling part of the seal, this connecting means being for example a screw, the head of which East blocked by the cylinder head and whose rod engages in the aforementioned opening.
Enfin, selon encore une autre caractéristique de l'invention, les deux parties étanchéité et refroidissement qui forment le joint, forment une pièce monobloc qui est fabriquée en un acier à ressort, par exemple.Finally, according to yet another characteristic of the invention, the two sealing parts and cooling which form the joint, form a part monobloc which is made of spring steel, by example.
Un avantage du dispositif d'étanchéité selon l'invention réside dans le fait que l'étanchéité est assurée par un dispositif en une seule pièce facilitant sa fabrication et son montage dans l'arme et par suite son remplacement en cas de détérioration.An advantage of the sealing device according to the invention resides in the fact that the seal is provided by a single piece device facilitating its manufacture and its mounting in the weapon and consequently its replacement in the event of deterioration.
Un autre avantage réside dans l'utilisation de la pression des gaz de combustion pour assurer le déplacement du dispositif d'étanchéité et sa déformation.Another advantage is the use of the combustion gas pressure to ensure the displacement of the sealing device and its deformation.
D'autres caractéristiques, avantages et détails de l'invention apparaítront à la lecture du complément de description donné ci-après à titre d'exemple d'un mode de réalisation en relation avec des dessins sur lesquels :
- la figure 1 est une vue en coupe longitudinale partielle d'une arme,
- la figure 2 est une vue en coupe du dispositif d'étanchéité selon l'invention, et
- les figures 3 à 5 sont des vues en coupe partielle illustrant le fonctionnement.
- FIG. 1 is a view in partial longitudinal section of a weapon,
- FIG. 2 is a sectional view of the sealing device according to the invention, and
- Figures 3 to 5 are partial sectional views illustrating the operation.
L'arme 1 partiellement représentée en coupe
longitudinale sur la figure 1 comprend un canon aligné
avec la culasse 3 dans la chambre 3a de laquelle est
logée une munition 4 sans douille constituée d'une charge
propulsive 5 et d'un projectile 6 engagé dans le canon.
La munition 4 est mise à feu à l'aide d'un dispositif
d'initiation 7 électrique ou à percussion. Le canon 2 et
la culasse 3 sont fixés l'un à l'autre à l'aide d'une
verrou de culasse 8. La culasse 3 est soumise à l'action
d'un ressort récupérateur 9 qui applique sur la culasse 3
une force axiale F.Weapon 1 partially shown in section
longitudinal in Figure 1 includes an aligned barrel
with
Entre le canon 2 et la culasse 3, l'étanchéité
aux gaz de combustion produite par l'explosion de la
charge propulsive 5 est assurée suivant l'invention par
un joint 11 représenté à la figure 2 et décrit ci-après.Between the
Le joint 11 comprend :
- une
partie étanchéité 12 de forme annulaire, dont une face d'extrémité forme une surface d'étanchéité axiale 13 destinée à venir en appui sur la face arrière 2a ducanon 2, et qui comporte vers son autre extrémité une lèvre d'étanchéité radiale 14 destinée à venir en appui sur la paroi interne de la chambre 3a, et - une
partie refroidissement 15 destinée à limiter l'échauffement de lapartie étanchéité 12 qui est au contact des gaz de combustion.
- a sealing
portion 12 of annular shape, one end face of which forms anaxial sealing surface 13 intended to come to bear on therear face 2a of thebarrel 2, and which comprises towards its other end aradial sealing lip 14 intended to come to bear on the internal wall of the chamber 3a, and - a
cooling part 15 intended to limit the heating of the sealingpart 12 which is in contact with the combustion gases.
La partie refroidissement 15 du joint 11 est
de forme annulaire, coaxiale extérieurement à la partie
étanchéité 12 et reliée à la périphérie de cette dernière
par une paroi radiale annulaire 16. La position axiale de
la paroi de liaison 16 est telle que, côté canon, la
partie étanchéité 12, la partie refroidissement 15 et la
paroi de liaison 16 délimitent entre elles une cavité 17
de décompression des gaz de combustion. Dans l'exemple
illustré, la partie refroidissement 15 s'étend d'un même
côté de la paroi de liaison 16 et en direction du
canon 2.The
Le joint 11 est fabriqué en un matériau
élastiquement déformable ayant des propriétés thermomécaniques
élevées et une large plage de températures de
fonctionnement, entre - 50° et 450°, ce matériau étant
par exemple un acier à ressort.The
A titre d'exemple, la partie étanchéité 12 du
joint 11 a un diamètre extérieur de l'ordre de 13 mm,
s'étend sur une longueur de 5,5 mm, la lèvre ayant une
épaisseur de l'ordre de 0,4 mm, la partie refroidissement
14 s'étend sur une longueur de l'ordre de 9 mm et a une
épaisseur de l'ordre de 3,7 mm, et la cavité de
décompression a une largeur de l'ordre de 2,5 mm.For example, the sealing
D'une manière générale, la partie
refroidissement 15 s'étend axialement sur une longueur
supérieure à celle de la partie étanchéité 12, de façon à
permettre le refroidissement du joint 11 en limitant
l'échauffement de la partie étanchéité 12 qui est
directement au contact des gaz de combustion, de sorte
que sa température reste inférieure à la température de
revenu de l'acier la constituant.In general, the
En se reportant à la figure 3, la partie
refroidissement 15 du joint 11 est destinée à se loger
dans un espace annulaire 18 délimité entre la partie
arrière du canon 2 et la culasse 3. Le joint 11 est
destiné à être monté préserré entre le canon 2 et la
culasse 3 d'une part, et fixé de manière flottante pour
pouvoir se déplacer axialement sous l'action des gaz de
combustion. Le montage flottant du joint 11 permet de
garantir son positionnement entre le canon 2 et la
culasse 3 lors de la montée en pression dans la
chambre 3a.Referring to Figure 3, the part
cooling 15 of the
Sur la figure 3, le joint 11 est fixé à la
culasse 3 par au moins un moyen de liaison 20 s'engageant
librement à l'intérieur d'une ouverture oblongue 22
ménagée dans la paroi de la partie refroidissement 15 du
joint 11. Ce moyen de liaison 20 est par exemple
constitué par une vis, dont la tête 20a est bloquée dans
la culasse 3, alors que sa tige 20b s'engage librement
dans l'ouverture 22. On peut prévoir par exemple trois
vis 20 régulièrement réparties autour de la partie
refroidissement 15 du joint 11. Le joint 11 est monté
préserré entre le canon 2 et la culasse 3 par l'action du
ressort récupérateur 9 qui agit sur la culasse 3, de
telle sorte que sa surface d'extrémité axiale 13 est en
appui contre la face arrière 2a du canon 2 mais avec
présence d'un jeu radial minimal Jr entre la lèvre
d'étanchéité 14 et la paroi interne de la chambre 3a.In FIG. 3, the
En fonctionnement, la déformation élastique du
joint 11 va lui permettre de s'appliquer de façon intime
sous l'effet de la pression des gaz de combustion contre
le canon 2 par plaquage axial de la surface 13 de la
partie étanchéité 12 et contre la paroi de la chambre 3a
par déformation élastique de la lèvre 14. Plus
précisément, après allumage de la charge propulsive 5, la
pression augmente dans la chambre 3a et le joint 11 passe
par deux phases successives à partir de la position
initiale représentée sur la figure 3. Au début du coup de
feu, comme montré sur la figure 4, la pression passe par
une valeur P0 de 4.107Pa, appelée pression de plaquage, à
laquelle le jeu radial Jr de montage du joint 11 dans la
chambre 3a est supprimé par déformation élastique de la
lèvre 14 qui se plaque contre la paroi interne de la
chambre 3a. La résultante axiale des forces de pression
plaque par ailleurs la surface 13 du joint 11 contre la
face arrière 2a du canon absorbant ainsi le rattrapage de
jeu de verrouillage Jv entre la culasse 3 et le canon 2.
La chambre 3a est alors rendue parfaitement étanche dès
cette valeur de pression.In operation, the elastic deformation of the
La pression atteint sa valeur maximale, de
l'ordre de 5.107Pa, la température sa valeur maximale,
2500°C environ, et comme représenté sur la figure 5, le
joint 11, le canon 2 et la culasse 3 se déforment
uniformément. Le joint 11 glisse dans son ouverture de
logement 22 et maintient les étanchéités radiale et
axiale par déformation élastique de la partie étanchéité
soumise directement à l'action des gaz de combustion.The pressure reaches its maximum value, of the order of 5.10 7 Pa, the temperature its maximum value, approximately 2500 ° C, and as shown in Figure 5, the
Après le coup de feu, le joint 11, le canon 2
et la culasse 3 reprennent leurs positions respectives
représentées sur la figure 3.After the shot, the
D'une manière générale, la surface d'étanchéité axiale de la partie étanchéité 12 du joint 11 est réduite à une couronne de faible épaisseur, car cela permet :
- d'assurer un meilleur contact, parfaitement
continu entre le
joint 11 et lecanon 2, et s'affranchir ainsi des imperfections de géométrie, - d'augmenter la pression de contact entre le
joint 11 et lecanon 2, et limiter ainsi l'infiltration des gaz dues aux états de surface, et - de former la cavité de
décompression 17 qui fait chuter en pression et en vitesse les fuites éventuelles de gaz et freiner ainsi ces fuites.
- to ensure better, perfectly continuous contact between the
seal 11 and thebarrel 2, and thus to overcome imperfections in geometry, - to increase the contact pressure between the
seal 11 and thebarrel 2, and thus limit the infiltration of gases due to the surface conditions, and - to form the
decompression cavity 17 which causes any gas leaks to drop in pressure and speed and thus slow down these leaks.
D'une manière générale, on pourrait également
envisager que la fixation du joint 11 se fasse à
l'extrémité arrière du canon 2, plutôt que de le rendre
solidaire de la culasse mobile 3.In general, we could also
consider that the fixing of the
Claims (10)
- A sealing device for the combustive gases of a caseless munition (4), mounted between the barrel (2) and the firing chamber (3a) of a small-calibre weapon (1), which comprises a seal (11) made up of a ring-shaped sealing element (12), wherein one end face forms an axial sealing surface (13) designed to press against the rear face (2a) of the barrel (2), and which comprises towards its other end a radial sealing lip (14) designed to press against the inner wall of the firing chamber (3a), characterised in that the seal comprises a cooling element (15) which extends axially for a length which is greater than that of the sealing element (12), such as to reduce the rise in temperature of the sealing element (12) which comes into direct contact with the combustive gases.
- A sealing device according to Claim 1, characterised in that the seal (11) is fastened in a floating manner between the barrel (2) and the breech (3) so as to be able to move axially under the effect of the combustive gases.
- A sealing device according to Claims 1 or 2, characterised in that the cooling element of the seal (11) is ring-shaped, externally coaxially to the sealing element (12) of the seal and connected to the periphery of the sealing element by a ring-shaped radial wall (16).
- A sealing device according to Claim 3, characterised in that the axial position of the connecting wall (16) is such that, on the barrel side, the sealing element (12), the cooling element (15) and the connecting wall (16) of the seal demarcate between each other a decompression cavity (17) for the combustive gases.
- A sealing device according to Claim 3 or 4, characterised in that the cooling element (15) of the seal (11) is designed to be housed in a ring-shaped space (18) marked out between the rear element of the barrel (2) and the breech (3).
- A sealing device according to Claim 5, characterised in that the cooling element (15) of the seal is fastened to the breech (3) by at least one connecting means (20) freely engaging inside an oblong opening (22) arranged in the wall of the cooling element (15) of the seal.
- A sealing device according to Claim 6, characterised in that the connecting means (20) is a screw, whose head (20a) is locked by the breech (3) and whose shaft (20b) engages in the opening (22) of the cooling element (15) of the seal.
- A sealing device according to any one of the above Claims, characterised in that the seal (11) is made of a material able to deform elastically and which has high thermo-mechanical properties.
- A sealing device according to Claim 8, characterised in that the seal (11) is made of spring steel.
- A sealing device according to Claim 8 or 9, characterised in that the seal (11) is mounted pretightened between the barrel (2) and the breech (3).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9414911A FR2728064A1 (en) | 1994-12-12 | 1994-12-12 | SEALING DEVICE FOR FIREARMS HAVING AMMUNITION WITHOUT SOCKET |
FR9414911 | 1994-12-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0717253A1 EP0717253A1 (en) | 1996-06-19 |
EP0717253B1 true EP0717253B1 (en) | 1999-08-25 |
Family
ID=9469697
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95402532A Expired - Lifetime EP0717253B1 (en) | 1994-12-12 | 1995-11-13 | Obturator for caseless ammunition firearm |
Country Status (5)
Country | Link |
---|---|
US (1) | US5777256A (en) |
EP (1) | EP0717253B1 (en) |
AT (1) | ATE183820T1 (en) |
DE (1) | DE69511667T2 (en) |
FR (1) | FR2728064A1 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19905896A1 (en) * | 1999-02-11 | 2000-08-17 | Hilti Ag | Gunpowder-driven insertion device, with seal element able to be displaced relative to second part parallel to insertion direction |
DE10213928A1 (en) * | 2002-03-28 | 2003-10-09 | Rheinmetall W & M Gmbh | mortar tube |
FR2862377A1 (en) * | 2003-11-14 | 2005-05-20 | Philippe Courty | Seal system for firearm chamber taking rounds without shell cases has elastic ring fitting between chamber and piston when breech is closed |
DE102005020669A1 (en) * | 2005-05-03 | 2006-11-09 | Diehl Bgt Defence Gmbh & Co. Kg | Seal, in particular for caseless ammunition |
KR101049094B1 (en) | 2008-10-16 | 2011-07-15 | 국방과학연구소 | Chamber exchange type barrel device and bullet wave impact tester having the same |
EP2639252A1 (en) | 2012-03-14 | 2013-09-18 | Sika Technology AG | Polymeric accelerator for two component epoxy resin |
US11668549B2 (en) | 2012-09-28 | 2023-06-06 | Federal Cartridge Company | Muzzleloader systems |
US10030956B2 (en) | 2012-09-28 | 2018-07-24 | Vista Outdoor Operations Llc | Muzzleloader systems |
US10605577B2 (en) | 2012-09-28 | 2020-03-31 | Vista Outdoor Operations Llc | Muzzleloader systems |
US20140090285A1 (en) * | 2012-09-28 | 2014-04-03 | Alliant Techsystems Inc. | Muzzleloader and propellant system |
US9329003B2 (en) | 2012-09-28 | 2016-05-03 | Vista Outdoor Operations Llc | Muzzleloader systems |
USD849874S1 (en) | 2018-01-21 | 2019-05-28 | Vista Outdoor Operations Llc | Muzzleloader propellant cartridge |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL163448B (en) * | 1950-08-23 | Standard Abrasives Inc | SANDING FINISHER. | |
FR1157474A (en) * | 1956-08-24 | 1958-05-29 | France Etat | Improvements to sealing devices for automatic weapons |
US3006254A (en) * | 1960-02-17 | 1961-10-31 | Robert J Thierry | Self-energizing breech seal for guns |
US3159938A (en) * | 1962-07-27 | 1964-12-08 | Jr John W Treat | Gas seal for rotatable cartridge drum |
US3626620A (en) * | 1969-01-15 | 1971-12-14 | Maremont Corp | Gun having a floating firing chamber |
US3762328A (en) * | 1969-01-15 | 1973-10-02 | Maremont Corp | Caseless ammunition and gun therefor |
US3613500A (en) * | 1969-02-18 | 1971-10-19 | Trw Inc | Combination projectile guide and firing chamber seal |
US3645166A (en) * | 1969-07-28 | 1972-02-29 | Gen Motors Corp | Obturator for caseless ammunition firearm |
US3799560A (en) * | 1971-03-04 | 1974-03-26 | Gen Electric | Firearm chamber seal |
DE2435520C3 (en) * | 1974-07-24 | 1979-11-15 | Diehl Gmbh & Co, 8500 Nuernberg | Bolt seal for large-caliber weapons |
FR2600762B1 (en) * | 1986-06-25 | 1990-04-27 | France Etat Armement | HEAD TUBE SEALING SYSTEM |
DE3922334C2 (en) * | 1989-07-07 | 1994-04-21 | Rheinmetall Gmbh | Axially adjustable gun barrel bottom ring |
US5487232A (en) * | 1994-04-26 | 1996-01-30 | The Marlin Firearms Company | Detonator assembly |
-
1994
- 1994-12-12 FR FR9414911A patent/FR2728064A1/en active Granted
-
1995
- 1995-11-13 AT AT95402532T patent/ATE183820T1/en not_active IP Right Cessation
- 1995-11-13 EP EP95402532A patent/EP0717253B1/en not_active Expired - Lifetime
- 1995-11-13 DE DE69511667T patent/DE69511667T2/en not_active Expired - Fee Related
-
1997
- 1997-05-01 US US08/848,752 patent/US5777256A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
ATE183820T1 (en) | 1999-09-15 |
DE69511667D1 (en) | 1999-09-30 |
EP0717253A1 (en) | 1996-06-19 |
DE69511667T2 (en) | 1999-12-16 |
FR2728064B1 (en) | 1997-02-21 |
US5777256A (en) | 1998-07-07 |
FR2728064A1 (en) | 1996-06-14 |
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