EP2079980B1 - Device for the deconfinement of an ammunition casing - Google Patents

Device for the deconfinement of an ammunition casing Download PDF

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Publication number
EP2079980B1
EP2079980B1 EP07848252A EP07848252A EP2079980B1 EP 2079980 B1 EP2079980 B1 EP 2079980B1 EP 07848252 A EP07848252 A EP 07848252A EP 07848252 A EP07848252 A EP 07848252A EP 2079980 B1 EP2079980 B1 EP 2079980B1
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EP
European Patent Office
Prior art keywords
ring
connecting ring
fuse
intermediate ring
deconfinement
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EP07848252A
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German (de)
French (fr)
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EP2079980A2 (en
Inventor
Stéphane Cotet
Laurent Desgland
Dominique Dion
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Nexter Munitions SA
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Nexter Munitions SA
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B39/00—Packaging or storage of ammunition or explosive charges; Safety features thereof; Cartridge belts or bags
    • F42B39/20—Packages or ammunition having valves for pressure-equalising; Packages or ammunition having plugs for pressure release, e.g. meltable ; Blow-out panels; Venting arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/02—Fuze bodies; Fuze housings

Definitions

  • the technical field of the invention is that of the devices ensuring the deconfinement of a munition envelope containing an explosive charge and more particularly the deconfining devices for an explosive projectile body, whatever the caliber or the type of weapon pulling this projectile.
  • the deconfinement devices make it possible to avoid, for example, the detonation of a projectile as a result of a heating, for example during a fire.
  • the patent DE2131748 thus describes a closure cap of a projectile body that is put in place when the projectile is stored.
  • This plug has a closure plate which is connected by a fusible material. The temperature rise releases the plate which allows the evacuation of gases.
  • the heating can lead both to the initiation of the load itself as a result of the increase in pressure, the initiation of the rocket which also causes the detonation of the explosive charge.
  • This device comprises a connecting ring ensuring the connection of the rocket and the projectile ring which carries radial vents within which are arranged silicone plugs.
  • this device is however insufficiently effective because the total area of the vents is too small and does not ensure rapid deconfinement of the inside of the body of the projectile.
  • Such a device is complex because it implements a spring maintained in the compressed state.
  • the mechanical strength of the fuse material is also not ensured especially after long storage phases, which penalizes the reliability of this device.
  • the object of the invention is to propose a deconfining device that makes it possible in a simple and reliable manner to provide effective protection against accidental initiations due to the heating of the explosive charge of an ammunition and in particular of a projectile. 'artillery.
  • the device according to the invention ensures in particular this function even when the rocket is mounted on the body of the projectile.
  • the device according to the invention does not, however, interfere with the normal operation of the munition, ie the initiation of the explosive charge by the rocket.
  • the subject of the invention is a device for deconfining an envelope of a munition containing an explosive charge that can be initiated by a firing rocket, a device comprising a connecting ring connected to the envelope and making it possible to secure the rocket.
  • priming device to the casing characterized in that it comprises a means ensuring a weakened and shearable connection between the fuse and the connecting ring, which connection is sheared following an increase in the pressure inside the casing.
  • the casing, the connecting ring having a bottom forming a projectable plate on the explosive charge during the initiation of the rocket, bottom is also broken by the appearance of pressure within the body of the projectile.
  • the shearable connection means may comprise an intermediate ring which is interposed between the connecting ring and the rocket, which ring is connected to the rocket or to the connecting ring by a shearable element.
  • the intermediate ring may comprise an internal thread for receiving the rocket, the shearable element being disposed at an outer surface of the intermediate ring.
  • the shearable element of the intermediate ring may comprise at least one peripheral toothing intended to be housed in a complementary groove carried by the connecting ring.
  • the intermediate ring may comprise at least two longitudinal grooves delimiting radially deformable nozzles, the deformation of the nozzles allowing the establishment of the teeth in their grooves during attachment of the intermediate ring on the connecting ring.
  • the intermediate ring has more particularly at least one longitudinal tongue carried by its outer surface, tongue intended to be housed in a complementary groove carried by the connecting ring, and ensuring immobilization in rotation of the intermediate ring relative to the ring of connection.
  • the bottom may comprise at least one circular groove ensuring a decrease in its thickness.
  • the figure 1 shows in partial longitudinal section the front part of a munition 1 which is an artillery projectile.
  • This projectile is represented here schematically. It comprises an envelope or body 2 enclosing an explosive charge 3. Its front part AV carries a rocket 5.
  • the explosive charge 3 also bears at the level of its surface before a tablet 4 of an explosive priming composition.
  • a connecting ring 7 is connected to the body 2 of the projectile by a thread.
  • This connecting ring has a bottom 8 forming a projectable plate on the explosive charge 3; 4 during the initiation of the rocket 5.
  • the bottom 8 will advantageously comprise at least one circular groove 9 (see figure 3b ) which ensures a decrease in its thickness. This groove is obtained by machining a bottom face. It thus forms a zone of reduced thickness for the bottom 8.
  • the ring 7 is made of steel.
  • the thickness of the connecting ring at the bottom 8 is about 1 mm.
  • the initiation of the rocket 5 causes a cut of the bottom 8 at the groove 9.
  • the fuze 5 is fixed to the connecting ring 7 by means of a connecting means which comprises an intermediate ring 10 interposed between the connecting ring 7 and the fuze 5.
  • This intermediate ring 10 is connected to the rocket or connecting ring by a shearable element.
  • This ring 10 is open at both ends. It comprises an internal thread 11 which makes it possible to screw the rocket 5.
  • the intermediate ring 10 is made for example of plastic material. Depending on the operational constraints another material may be envisaged, for example brass.
  • the intermediate ring 10 has at its outer cylindrical surface 12 two peripheral peripheral teeth 13.
  • Each toothing 13 has in section a trapezoidal profile (see FIG. Figure 2c ) having an inclined flank 14 and a flank 15 straight and substantially perpendicular to the axis 16 of the ring 10.
  • the inclined side 14 is disposed at a front face 17 of the ring 10.
  • teeth 13 are intended to be housed in complementary grooves 18, which are carried by the connecting ring 7 (see figure 3b ).
  • the intermediate ring 10 further comprises at least two longitudinal slots 19 which extend over substantially half of the total height of the ring 10 and which delimit radially deformable nozzles 20.
  • the deformation of the nozzles 20 allows the insertion of the intermediate ring 10 into the connecting ring 7.
  • the slats 20 slide and deform radially without difficulty. They resume by their elasticity their initial position when the teeth 13 are in their grooves 18.
  • intermediate ring 10 comprises longitudinal tongues 21 which are borne by its external surface 12.
  • the tongues 21 make it possible to immobilize the intermediate ring 10 in rotation with respect to the connecting ring 7.
  • the intermediate ring 10 is thus after assembly completely integral both in rotation and in translation of the connecting ring 7.
  • tongues 21 could be implemented keys that would be housed in grooves of the intermediate ring and the connecting ring.
  • FIGS. 3a and 3b show the intermediate ring 10 fixed to the connecting ring 7.
  • the spouts 13 constitute a shearable element ensuring a connection between the two rings 7 and 10.
  • the nozzles 20 can no longer deform radially. Moreover, the straight flanks 15 of the teeth 13 prevent any extraction of the intermediate ring 10.
  • the number and dimensions of the teeth 13 are chosen according to the minimum pressure at which it is desired to ensure the deconfinement of the projectile.
  • the figure 4 thus shows the projectile 1 after rupture of the teeth 13.
  • the rocket 5 carries with it a portion of the intermediate ring 10.
  • the teeth 13 remain in their grooves 18.
  • the ejection of the rocket 5 leads to the opening of the hole 23 for filling the projectile 1.
  • the deconfinement is provided with an opening which is maximum for the evacuation of gases G.
  • the deconfining device thus makes it possible to ensure in a simple and reliable manner the protection of a projectile equipped with a firing rocket.
  • an intermediate ring 10 comprising, in place of the circular teeth 13, a shearable thread cooperating with a thread formed inside the connecting ring 7.
  • the shearable connection means will be constituted by a particular tapping of the inside of the connecting ring 7. This tapping will be defined in such a way as to shear at the occurrence of an internal pressure exceeding a certain threshold.
  • tapping which does not cover the entire internal cylindrical surface of the connecting ring 7 but a tapping which is interrupted by longitudinal zones that are not tapped and regularly distributed angularly.

Landscapes

  • General Engineering & Computer Science (AREA)
  • Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
  • Fuses (AREA)
  • Processing Of Solid Wastes (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Electrophotography Configuration And Component (AREA)
  • Lifting Devices For Agricultural Implements (AREA)
  • Food-Manufacturing Devices (AREA)
  • Wrapping Of Specific Fragile Articles (AREA)
  • Packages (AREA)

Abstract

A release device for the casing (2) of a munition (1) containing an explosive charge (3) initiated by a priming fuse (5), consisting of a connecting ring (7) fixed to (and allowing fixing of the fuse to) the casing, includes a breakable, shearable connector (10) between fuse and the connecting ring, such that the connection is sheared as a result of a pressure increase within the casing.

Description

Le domaine technique de l'invention est celui des dispositifs assurant le déconfinement d'une enveloppe de munition renfermant un chargement explosif et plus particulièrement des dispositifs de déconfinement pour un corps de projectile explosif, quel que soit le calibre ou le type d'arme tirant ce projectile.The technical field of the invention is that of the devices ensuring the deconfinement of a munition envelope containing an explosive charge and more particularly the deconfining devices for an explosive projectile body, whatever the caliber or the type of weapon pulling this projectile.

Les dispositifs de déconfinement permettent d'éviter par exemple la détonation d'un projectile comme suite à un échauffement, par exemple lors d'un incendie.The deconfinement devices make it possible to avoid, for example, the detonation of a projectile as a result of a heating, for example during a fire.

Lorsqu'un chargement explosif est échauffé sa décomposition engendre des gaz qui se trouvent enfermés à l'intérieur de l'enveloppe du projectile.When an explosive charge is heated its decomposition generates gases which are enclosed inside the shell of the projectile.

La pression augmente alors fortement conduisant à une mise en détonation du projectile.The pressure then increases strongly leading to detonation of the projectile.

Il est connu de prévoir des dispositifs de déconfinement qui permettent d'évacuer les gaz hors du projectile afin d'éviter cet accroissement de pression conduisant à la détonation.It is known to provide deconfinement devices that allow to evacuate the gas out of the projectile to avoid this increase in pressure leading to the detonation.

Le brevet DE2131748 décrit ainsi un bouchon de fermeture d'un corps de projectile qui est mis en place lorsque le projectile est stocké. Ce bouchon comporte une plaque de fermeture qui est reliée par un matériau fusible. L'élévation de température libère la plaque ce qui permet l'évacuation des gaz.The patent DE2131748 thus describes a closure cap of a projectile body that is put in place when the projectile is stored. This plug has a closure plate which is connected by a fusible material. The temperature rise releases the plate which allows the evacuation of gases.

Cependant un tel moyen de déconfinement ne peut être mis en oeuvre que lors d'une phase de stockage du projectile, phase dans laquelle la fusée est démontée.However, such a deconfining means can be implemented only during a storage phase of the projectile, phase in which the rocket is dismounted.

Or on cherche aujourd'hui à assurer une telle protection même pour un projectile portant sa fusée d'amorçage.Now we seek today to provide such protection even for a projectile carrying its firing rocket.

Dans ce cas l'échauffement peut conduire aussi bien à l'initiation du chargement lui-même comme suite à l'accroissement de la pression, qu'à l'initiation de la fusée ce qui provoque également la détonation du chargement explosif.In this case the heating can lead both to the initiation of the load itself as a result of the increase in pressure, the initiation of the rocket which also causes the detonation of the explosive charge.

On connaît également par le brevet FR2864219 un dispositif permettant d'assurer un déconfinement lorsque la fusée est montée sur le corps du projectile.It is also known from the patent FR2864219 a device to ensure deconfinement when the rocket is mounted on the body of the projectile.

Ce dispositif comprend une bague de raccordement assurant la liaison de la fusée et du projectile, bague qui porte des évents radiaux à l'intérieur desquels sont disposés des bouchons de silicone.This device comprises a connecting ring ensuring the connection of the rocket and the projectile ring which carries radial vents within which are arranged silicone plugs.

Bien qu'intéressant, ce dispositif est cependant insuffisamment efficace car la surface totale des évents est trop faible et ne permet pas d'assurer un déconfinement rapide de l'intérieur du corps du projectile.Although interesting, this device is however insufficiently effective because the total area of the vents is too small and does not ensure rapid deconfinement of the inside of the body of the projectile.

On connaît également par le brevet US5035181 , qui forme une base pour le préambule de la revendication 1, un dispositif de fixation d'une fusée sur un corps de munition, dispositif qui comporte une bague fixée au corps de munition par une couche d'un matériau qui est fusible comme suite à une élévation de la température. Après fusion, la bague portant la fusée est éjectée par l'action d'un ressort de compression.It is also known from the patent US5035181 , which forms a base for the preamble of claim 1, a device for attaching a rocket to a munition body, which device comprises a ring attached to the munition body by a layer of a material which is fusible as a result of a rise in temperature. After melting, the ring bearing the rocket is ejected by the action of a compression spring.

Un tel dispositif est complexe car il met en oeuvre un ressort maintenu à l'état comprimé. La tenue mécanique du matériau fusible n'est par ailleurs pas assurée notamment après des phases de stockage de longue durée, ce qui pénalise la fiabilité de ce dispositif.Such a device is complex because it implements a spring maintained in the compressed state. The mechanical strength of the fuse material is also not ensured especially after long storage phases, which penalizes the reliability of this device.

On connaît enfin par le brevet DE4336808 un projectile de marquage d'impact qui comporte une fusée éjectable sur trajectoire par l'action d'une charge pyrotechnique spécifique. Cependant un tel projectile ne comporte pas de chargement explosif. Avec un tel projectile le problème de la protection d'un chargement contre les élévations de températures ne se pose donc pas. Par ailleurs la structure décrite n'est pas adaptée à l'initiation d'un chargement explosif.Finally, we know by the patent DE4336808 an impact marking projectile which comprises an ejection rocket on trajectory by the action of a specific pyrotechnic charge. However, such a projectile does not have an explosive charge. With such a projectile the problem of protecting a load against temperature rises does not arise. Moreover, the structure described is not suitable for initiating an explosive charge.

L'invention a pour objet de proposer un dispositif de déconfinement permettant d'une façon simple et fiable d'assurer une protection efficace contre les initiations accidentelles dues à l'échauffement du chargement explosif d'une munition et en particulier d'un projectile d'artillerie.The object of the invention is to propose a deconfining device that makes it possible in a simple and reliable manner to provide effective protection against accidental initiations due to the heating of the explosive charge of an ammunition and in particular of a projectile. 'artillery.

Le dispositif selon l'invention assure en particulier cette fonction même lorsque la fusée est montée sur le corps du projectile.The device according to the invention ensures in particular this function even when the rocket is mounted on the body of the projectile.

Le dispositif selon l'invention ne perturbe pas cependant le fonctionnement normal de la munition, c'est à dire l'initiation du chargement explosif par la fusée.The device according to the invention does not, however, interfere with the normal operation of the munition, ie the initiation of the explosive charge by the rocket.

Ainsi l'invention a pour objet un dispositif de déconfinement d'une enveloppe d'une munition renfermant un chargement explosif pouvant être initié par une fusée d'amorçage, dispositif comprenant une bague de raccordement liée à l'enveloppe et permettant de solidariser la fusée d'amorçage à l'enveloppe, dispositif caractérisé en ce qu'il comporte un moyen assurant une liaison fragilisée et cisaillable entre la fusée et la bague de raccordement, liaison qui se trouve cisaillée suite à une élévation de la pression à l'intérieur de l'enveloppe, la bague de raccordement comportant un fond formant une plaque projetable sur le chargement explosif lors de l'initiation de la fusée, fond étant également rompu par l'apparition d'une pression à l'intérieur du corps du projectile.Thus, the subject of the invention is a device for deconfining an envelope of a munition containing an explosive charge that can be initiated by a firing rocket, a device comprising a connecting ring connected to the envelope and making it possible to secure the rocket. priming device to the casing, characterized in that it comprises a means ensuring a weakened and shearable connection between the fuse and the connecting ring, which connection is sheared following an increase in the pressure inside the casing. the casing, the connecting ring having a bottom forming a projectable plate on the explosive charge during the initiation of the rocket, bottom is also broken by the appearance of pressure within the body of the projectile.

Le moyen de liaison cisaillable peut comprendre une bague intermédiaire qui est interposée entre la bague de raccordement et la fusée, bague qui est reliée à la fusée ou à la bague de raccordement par un élément cisaillable.The shearable connection means may comprise an intermediate ring which is interposed between the connecting ring and the rocket, which ring is connected to the rocket or to the connecting ring by a shearable element.

La bague intermédiaire peut comporter un taraudage interne permettant de recevoir la fusée, l'élément cisaillable étant disposé au niveau d'une surface externe de la bague intermédiaire.The intermediate ring may comprise an internal thread for receiving the rocket, the shearable element being disposed at an outer surface of the intermediate ring.

L'élément cisaillable de la bague intermédiaire peut comporter au moins une denture périphérique destinée à venir se loger dans une gorge complémentaire portée par la bague de raccordement.The shearable element of the intermediate ring may comprise at least one peripheral toothing intended to be housed in a complementary groove carried by the connecting ring.

La bague intermédiaire peut comporter au moins deux rainures longitudinales délimitant des becs déformables radialement, la déformation des becs permettant la mise en place des dentures dans leurs gorges lors de la fixation de la bague intermédiaire sur la bague de raccordement.The intermediate ring may comprise at least two longitudinal grooves delimiting radially deformable nozzles, the deformation of the nozzles allowing the establishment of the teeth in their grooves during attachment of the intermediate ring on the connecting ring.

La bague intermédiaire comporte plus particulièrement au moins une languette longitudinale portée par sa surface externe, languette destinée à venir se loger dans une rainure complémentaire portée par la bague de raccordement, et assurant une immobilisation en rotation de la bague intermédiaire par rapport à la bague de raccordement.The intermediate ring has more particularly at least one longitudinal tongue carried by its outer surface, tongue intended to be housed in a complementary groove carried by the connecting ring, and ensuring immobilization in rotation of the intermediate ring relative to the ring of connection.

Le fond pourra comporter au moins une gorge circulaire assurant une diminution de son épaisseur.The bottom may comprise at least one circular groove ensuring a decrease in its thickness.

L'invention sera mieux comprise à la lecture de la description qui va suivre d'un mode particulier de réalisation, description faite en référence aux dessins annexés et dans desquels :

  • La figure 1 est une coupe longitudinale schématique partielle d'une partie avant d'un projectile équipé d'un dispositif selon un mode de réalisation de l'invention,
  • les figures 2a, 2b, 2c et 2d montrent un exemple de réalisation d'une bague intermédiaire d'un dispositif selon l'invention, la bague étant représentée en vue externe sur les figures 2a et 2b et en coupe longitudinale sur la figure 2c, coupe réalisée suivant le plan dont la trace AA est repérée sur la figure 2b, la figure 2d est par ailleurs une vue en perspective de la bague,
  • les figures 3a et 3b représentent la bague intermédiaire assemblée à la bague de raccordement, la figure 3a étant une vue en perspective de cet assemblage et la figure 3b une vue en coupe longitudinale,
  • la figure 4 enfin schématise le fonctionnement du dispositif selon l'invention.
The invention will be better understood on reading the following description of a particular embodiment, a description given with reference to the appended drawings in which:
  • The figure 1 is a partial schematic longitudinal section of a front part of a projectile equipped with a device according to one embodiment of the invention,
  • the Figures 2a, 2b , 2c and 2d show an exemplary embodiment of an intermediate ring of a device according to the invention, the ring being shown in an external view on the Figures 2a and 2b and in longitudinal section on the Figure 2c , cut according to the plane whose track AA is marked on the figure 2b , the figure 2d is also a perspective view of the ring,
  • the Figures 3a and 3b represent the intermediate ring assembled to the connecting ring, the figure 3a being a perspective view of this assembly and the figure 3b a longitudinal sectional view,
  • the figure 4 finally schematizes the operation of the device according to the invention.

La figure 1 montre en coupe longitudinale partielle la partie avant d'une munition 1 qui est un projectile d'artillerie. Ce projectile est représenté ici de façon schématique. Il comporte une enveloppe ou corps 2 renfermant un chargement explosif 3. Sa partie avant AV porte une fusée 5.The figure 1 shows in partial longitudinal section the front part of a munition 1 which is an artillery projectile. This projectile is represented here schematically. It comprises an envelope or body 2 enclosing an explosive charge 3. Its front part AV carries a rocket 5.

Le chargement explosif 3 porte par ailleurs au niveau de sa surface avant un comprimé 4 d'une composition explosive d'amorçage.The explosive charge 3 also bears at the level of its surface before a tablet 4 of an explosive priming composition.

Une bague de raccordement 7 est liée au corps 2 du projectile par un filetage. Cette bague de raccordement comporte un fond 8 formant une plaque projetable sur le chargement explosif 3;4 lors de l'initiation de la fusée 5.A connecting ring 7 is connected to the body 2 of the projectile by a thread. This connecting ring has a bottom 8 forming a projectable plate on the explosive charge 3; 4 during the initiation of the rocket 5.

Le fond 8 comportera avantageusement au moins une gorge circulaire 9 (voir figure 3b) qui assure une diminution de son épaisseur. Cette gorge est obtenue par usinage d'une face du fond. Elle forme ainsi une zone d'épaisseur réduite pour le fond 8.The bottom 8 will advantageously comprise at least one circular groove 9 (see figure 3b ) which ensures a decrease in its thickness. This groove is obtained by machining a bottom face. It thus forms a zone of reduced thickness for the bottom 8.

La bague 7 est réalisée en acier. L'épaisseur de la bague de raccordement au niveau du fond 8 est de 1 mm environ.The ring 7 is made of steel. The thickness of the connecting ring at the bottom 8 is about 1 mm.

L'initiation de la fusée 5 entraîne une découpe du fond 8 au niveau de la gorge 9.The initiation of the rocket 5 causes a cut of the bottom 8 at the groove 9.

Il en résulte une projection du fond 8 sur le relais de détonation 4 qui assure l'initiation du chargement explosif 3.This results in a projection of the bottom 8 on the detonation relay 4 which ensures the initiation of the explosive charge 3.

Une telle bague de raccordement comportant un fond projetable constitue l'objet du brevet EP977005 et il n'est pas nécessaire de la décrire plus en détail.Such a connecting ring having a projectable bottom is the subject of the patent EP977005 and it is not necessary to describe it in more detail.

Conformément à l'invention, la fusée 5 est fixée à la bague de raccordement 7 à l'aide d'un moyen de liaison qui comprend une bague intermédiaire 10, interposée entre la bague de raccordement 7 et la fusée 5. Cette bague intermédiaire 10 est reliée à la fusée ou à la bague de raccordement par un élément cisaillable.According to the invention, the fuze 5 is fixed to the connecting ring 7 by means of a connecting means which comprises an intermediate ring 10 interposed between the connecting ring 7 and the fuze 5. This intermediate ring 10 is connected to the rocket or connecting ring by a shearable element.

Les figures 2a à 2d montrent plus précisément la structure de la bague intermédiaire 10The Figures 2a to 2d show more precisely the structure of the intermediate ring 10

Cette bague 10 est ouverte à ses deux extrémités. Elle comporte un taraudage interne 11 qui permet de visser la fusée 5. La bague intermédiaire 10 est réalisée par exemple en matière plastique. En fonction des contraintes opérationnelles un autre matériau pourra être envisagé, par exemple le laiton.This ring 10 is open at both ends. It comprises an internal thread 11 which makes it possible to screw the rocket 5. The intermediate ring 10 is made for example of plastic material. Depending on the operational constraints another material may be envisaged, for example brass.

La bague intermédiaire 10 comporte au niveau de sa surface cylindrique externe 12 deux dentures périphériques circulaires 13.The intermediate ring 10 has at its outer cylindrical surface 12 two peripheral peripheral teeth 13.

Chaque denture 13 a en coupe un profil trapézoïdal (voir la figure 2c) comportant un flanc incliné 14 et un flanc 15 droit et sensiblement perpendiculaire à l'axe 16 de la bague 10. Le flanc incliné 14 est disposé au niveau d'une face avant 17 de la bague 10.Each toothing 13 has in section a trapezoidal profile (see FIG. Figure 2c ) having an inclined flank 14 and a flank 15 straight and substantially perpendicular to the axis 16 of the ring 10. The inclined side 14 is disposed at a front face 17 of the ring 10.

Ces dentures 13 sont destinées à venir se loger dans des gorges complémentaires 18, qui sont portées par la bague de raccordement 7 (voir figure 3b).These teeth 13 are intended to be housed in complementary grooves 18, which are carried by the connecting ring 7 (see figure 3b ).

La bague intermédiaire 10 comporte par ailleurs au moins deux fentes longitudinales 19 qui s'étendent sur sensiblement la moitié de la hauteur totale de la bague 10 et qui délimitent des becs 20 déformables radialement.The intermediate ring 10 further comprises at least two longitudinal slots 19 which extend over substantially half of the total height of the ring 10 and which delimit radially deformable nozzles 20.

Il y a sur la bague 10 quatre fentes 19 régulièrement réparties angulairement et qui délimitent donc quatre becs 20 qui peuvent se déformer radialement.There is on the ring 10 four slots 19 regularly distributed angularly and thus delimit four nozzles 20 which can deform radially.

La déformation des becs 20 permet la mise en place de la bague intermédiaire 10 dans la bague de raccordement 7.The deformation of the nozzles 20 allows the insertion of the intermediate ring 10 into the connecting ring 7.

Lors de cette mise en place, et du fait de l'orientation des flancs inclinés 14 des dentures 13 vers l'avant de la bague intermédiaire 10, les becs 20 glissent et se déforment radialement sans difficulté. Ils reprennent par leur élasticité leur position initiale lorsque les dentures 13 se trouvent dans leurs gorges 18.During this installation, and because of the orientation of the inclined flanks 14 of the teeth 13 towards the front of the intermediate ring 10, the slats 20 slide and deform radially without difficulty. They resume by their elasticity their initial position when the teeth 13 are in their grooves 18.

Les flancs droits 15 des dentures 13 interdisent tout retour en arrière de la bague intermédiaire 10 qui se trouve donc solidaire de la bague de raccordement 7.The straight flanks 15 of the toothing 13 prohibit any return back of the intermediate ring 10 which is therefore integral with the connecting ring 7.

Par ailleurs la bague intermédiaire 10 comporte des languettes longitudinales 21 qui sont portées par sa surface externe 12.Furthermore, the intermediate ring 10 comprises longitudinal tongues 21 which are borne by its external surface 12.

Ces languettes sont destinées à venir se loger dans des rainures complémentaires 22 portées par la bague de raccordement 7 (voir les figures 3a et 3b).These tabs are intended to be housed in complementary grooves 22 carried by the connecting ring 7 (see Figures 3a and 3b ).

Les languettes 21 permettent d'assurer une immobilisation en rotation de la bague intermédiaire 10 par rapport à la bague de raccordement 7.The tongues 21 make it possible to immobilize the intermediate ring 10 in rotation with respect to the connecting ring 7.

La bague intermédiaire 10 se trouve donc après montage totalement solidaire aussi bien en rotation qu'en translation de la bague de raccordement 7.The intermediate ring 10 is thus after assembly completely integral both in rotation and in translation of the connecting ring 7.

On évite ainsi tout risque de vibrations relatives d'une bague par rapport à l'autre et les risques de dévissage de la fusée 5 qui pourraient en découler.This avoids any risk of relative vibration of one ring relative to the other and the risks of unscrewing the rocket 5 that could result.

A la place des languettes 21 on pourrait mettre en oeuvre des clavettes qui se logeraient dans des rainures de la bague intermédiaire et de la bague de raccordement.Instead of the tongues 21 could be implemented keys that would be housed in grooves of the intermediate ring and the connecting ring.

Les figures 3a et 3b montrent la bague intermédiaire 10 fixée à la bague de raccordement 7.The Figures 3a and 3b show the intermediate ring 10 fixed to the connecting ring 7.

Les becs 13 constituent un élément cisaillable assurant une liaison entre les deux bagues 7 et 10.The spouts 13 constitute a shearable element ensuring a connection between the two rings 7 and 10.

Une fois la fusée 5 vissée à la bague intermédiaire 10, les becs 20 ne peuvent plus se déformer radialement. Par ailleurs les flancs droits 15 des dentures 13 empêchent toute extraction de la bague intermédiaire 10.Once the fuse 5 is screwed to the intermediate ring 10, the nozzles 20 can no longer deform radially. Moreover, the straight flanks 15 of the teeth 13 prevent any extraction of the intermediate ring 10.

Le nombre et les dimensions des dentures 13 sont choisies en fonction de la pression minimale à laquelle on cherche à assurer le déconfinement du projectile.The number and dimensions of the teeth 13 are chosen according to the minimum pressure at which it is desired to ensure the deconfinement of the projectile.

En effet, l'apparition d'une pression à l'intérieur du corps 2 du projectile 1 va provoquer tout d'abord la rupture de la cloison 8. La pression s'exerce ensuite sur la fusée 5 qui entraîne la bague intermédiaire 10. Il en résulte une contrainte de cisaillement qui s'exerce sur les dentures 13.Indeed, the appearance of a pressure inside the body 2 of the projectile 1 will first cause the rupture of the partition 8. The pressure is then exerted on the rocket 5 which drives the intermediate ring 10. This results in a shear stress which is exerted on the teeth 13.

Lorsque le niveau de cisaillement souhaité est atteint les dentures 13 sont rompues et la fusée 5 est éjectée.When the desired shear level is reached the teeth 13 are broken and the rocket 5 is ejected.

La figure 4 montre ainsi le projectile 1 après rupture des dentures 13. La fusée 5 entraîne avec elle une partie de la bague intermédiaire 10. Les dentures 13 restent dans leurs gorges 18.The figure 4 thus shows the projectile 1 after rupture of the teeth 13. The rocket 5 carries with it a portion of the intermediate ring 10. The teeth 13 remain in their grooves 18.

L'éjection de la fusée 5 conduit à l'ouverture de l'orifice 23 de remplissage du projectile 1. Le déconfinement est assuré avec une ouverture qui est maximale pour l'évacuation des gaz G.The ejection of the rocket 5 leads to the opening of the hole 23 for filling the projectile 1. The deconfinement is provided with an opening which is maximum for the evacuation of gases G.

Le dispositif de déconfinement selon l'invention permet donc d'assurer d'une façon simple et fiable la protection d'un projectile doté d'une fusée d'amorçage.The deconfining device according to the invention thus makes it possible to ensure in a simple and reliable manner the protection of a projectile equipped with a firing rocket.

On notera que si le projectile est stocké sans sa fusée, le déconfinement est cependant assuré grâce à la présence de la gorge 9.Note that if the projectile is stored without its rocket, the deconfinement is however ensured thanks to the presence of the groove 9.

L'accroissement de pression dans l'enveloppe du projectile provoquera (comme dans le cas précédent d'un projectile amorcé) l'ouverture du fond 8 au niveau de la gorge 9. Le déconfinement du projectile est alors immédiat.The increase in pressure in the shell of the projectile will cause (as in the previous case of a projectile initiated) the opening of the bottom 8 at the throat 9. The deconfinement of the projectile is then immediate.

Il est bien entendu possible à titre de variante de prévoir un nombre de gorges différent au niveau du fond 8.It is of course possible as an alternative to provide a different number of grooves at the bottom 8.

Il est également possible de définir un moyen de liaison cisaillable de structure différente.It is also possible to define a shearable connection means of different structure.

On pourra par exemple définir une bague intermédiaire 10 comportant, à la place des dentures circulaires 13, un filetage cisaillable coopérant avec un taraudage aménagé à l'intérieur de la bague de raccordement 7.For example, it is possible to define an intermediate ring 10 comprising, in place of the circular teeth 13, a shearable thread cooperating with a thread formed inside the connecting ring 7.

Pour doser la résistance de ce filetage cisaillable on pourra réaliser un filetage qui ne couvre pas toute la surface cylindrique externe de la bague intermédiaire 10 mais un filetage qui est interrompu par des zones longitudinales non filetées et régulièrement réparties angulairement.To measure the resistance of this shearable threading, it will be possible to make a thread which does not cover the entire external cylindrical surface of the intermediate ring 10 but a thread which is interrupted by longitudinal zones which are not threaded and regularly distributed angularly.

On pourra également, à titre de variante, définir un dispositif dans lequel il n'y a pas de bague intermédiaire 10. Dans ce dispositif, le moyen de liaison cisaillable sera constitué par un taraudage particulier de l'intérieur de la bague de raccordement 7. Ce taraudage sera défini de façon à se cisailler lors de l'apparition d'une pression interne dépassant un certain seuil.It is also possible, by way of a variant, to define a device in which there is no intermediate ring 10. In this device, the shearable connection means will be constituted by a particular tapping of the inside of the connecting ring 7. This tapping will be defined in such a way as to shear at the occurrence of an internal pressure exceeding a certain threshold.

On peut par exemple réaliser un taraudage qui ne couvre pas toute la surface cylindrique interne de la bague de raccordement 7 mais un taraudage qui est interrompu par des zones longitudinales non taraudées et régulièrement réparties angulairement.For example, it is possible to make a tapping which does not cover the entire internal cylindrical surface of the connecting ring 7 but a tapping which is interrupted by longitudinal zones that are not tapped and regularly distributed angularly.

Claims (7)

  1. A deconfinement device for the casing (2) of a piece of ammunition (1) enclosing an explosive load (3) able to be ignited by a priming fuse (5), such device comprising a connecting ring (7) linked to the casing and enabling the priming fuse to be joined to the casing, device wherein it incorporates means (10) to ensure a weakened and shearable link between the fuse (5) and the connecting ring (7), such link being sheared further to an increase in the pressure inside the casing (2), the connecting ring (7) incorporating a base (8) forming a plate that can be projected onto the explosive load (3, 4) during the ignition of the fuse (5), such base being able to be fractured by the presence of pressure inside the body (2) of the projectile (1).
  2. A deconfinement device according to Claim 1, wherein the shearable linking means comprise an intermediate ring (10) that is positioned between the connecting ring (7) and the fuse (5), ring which is linked to the fuse or to the connecting ring by a shearable element (13).
  3. A deconfinement device according to Claim 2, wherein the intermediate ring (10) incorporates female threading (11) to receive the fuse (5), the shearable element (13) being arranged at an external surface (12) of the intermediate ring (10).
  4. A deconfinement device according to Claim 3, wherein the shearable element of the intermediate ring (10) incorporates at least one peripheral toothing (13) intended to be accommodated in a matching channel (18) made in the connecting ring (7).
  5. A deconfinement device according to Claim 4, wherein the intermediate ring (10) incorporates at least two longitudinal grooves (19) delimiting radially deformable lips (20), the deformation of such lips (20) enabling the toothings (13) to be put into position in its channels (18) when the intermediate ring (10) is being attached to the connecting ring (7).
  6. A deconfinement device according to one of Claims 4 or 5, wherein the intermediate ring (10) incorporates at least one longitudinal rib (21) on its external surface (12), such rib intended to be housed in a matching groove (22) in the connecting ring (7), and ensuring the immobilisation in rotation of the intermediate ring (10) with respect to the connecting ring (7).
  7. A deconfinement device according to one of Claims 1 to 6, wherein the base (8) incorporates at least one circular channel (9) ensuring a reduction in its thickness.
EP07848252A 2006-09-29 2007-09-19 Device for the deconfinement of an ammunition casing Active EP2079980B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0608681A FR2906606B1 (en) 2006-09-29 2006-09-29 DEVICE FOR DECONFINING AN ENVELOPE OF A MUNITION.
PCT/FR2007/001518 WO2008040860A2 (en) 2006-09-29 2007-09-19 Device for the deconfinement of an ammunition casing

Publications (2)

Publication Number Publication Date
EP2079980A2 EP2079980A2 (en) 2009-07-22
EP2079980B1 true EP2079980B1 (en) 2010-03-17

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EP07848252A Active EP2079980B1 (en) 2006-09-29 2007-09-19 Device for the deconfinement of an ammunition casing

Country Status (8)

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US (1) US7930975B2 (en)
EP (1) EP2079980B1 (en)
AT (1) ATE461417T1 (en)
DE (1) DE602007005394D1 (en)
ES (1) ES2342856T3 (en)
FR (1) FR2906606B1 (en)
IL (1) IL197816A (en)
WO (1) WO2008040860A2 (en)

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FR2948186B1 (en) 2009-07-17 2015-02-20 Tda Armements Sas AMMUNITION COMPRISING MEANS FOR NEUTRALIZING ITS EXPLOSIVE LOADING
FI122080B (en) * 2010-02-19 2011-08-15 Patria Land & Armament Oy Lifting device for projectiles
US8381656B1 (en) * 2011-09-09 2013-02-26 The United States Of America As Represented By The Secretary Of The Army Mechanical cartridge and grenade venting
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DE102014013316B4 (en) * 2014-09-08 2016-04-07 Diehl Bgt Defence Gmbh & Co. Kg Container for storing an explosive

Also Published As

Publication number Publication date
US7930975B2 (en) 2011-04-26
FR2906606B1 (en) 2010-12-31
FR2906606A1 (en) 2008-04-04
ATE461417T1 (en) 2010-04-15
WO2008040860A2 (en) 2008-04-10
US20100024675A1 (en) 2010-02-04
EP2079980A2 (en) 2009-07-22
ES2342856T3 (en) 2010-07-15
DE602007005394D1 (en) 2010-04-29
WO2008040860A3 (en) 2008-05-22
IL197816A0 (en) 2009-12-24
IL197816A (en) 2013-07-31

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