EP0147314B1 - Base wad of plastics material - Google Patents

Base wad of plastics material Download PDF

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Publication number
EP0147314B1
EP0147314B1 EP84402665A EP84402665A EP0147314B1 EP 0147314 B1 EP0147314 B1 EP 0147314B1 EP 84402665 A EP84402665 A EP 84402665A EP 84402665 A EP84402665 A EP 84402665A EP 0147314 B1 EP0147314 B1 EP 0147314B1
Authority
EP
European Patent Office
Prior art keywords
base
case
ammunition
tubular portion
obturator
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
Application number
EP84402665A
Other languages
German (de)
French (fr)
Other versions
EP0147314A2 (en
EP0147314A3 (en
Inventor
Pierre Moreau
Jean Claude Sauvestre
Patrick Montier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giat Industries SA
Original Assignee
Direction General pour lArmement DGA
Giat Industries SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Application filed by Direction General pour lArmement DGA, Giat Industries SA filed Critical Direction General pour lArmement DGA
Priority to AT84402665T priority Critical patent/ATE34837T1/en
Publication of EP0147314A2 publication Critical patent/EP0147314A2/en
Publication of EP0147314A3 publication Critical patent/EP0147314A3/en
Application granted granted Critical
Publication of EP0147314B1 publication Critical patent/EP0147314B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
    • F42B5/02—Cartridges, i.e. cases with charge and missile
    • F42B5/18—Caseless ammunition; Cartridges having combustible cases
    • F42B5/181—Caseless ammunition; Cartridges having combustible cases consisting of a combustible casing wall and a metal base; Connectors therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
    • F42B5/02—Cartridges, i.e. cases with charge and missile
    • F42B5/18—Caseless ammunition; Cartridges having combustible cases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
    • F42B5/26—Cartridge cases
    • F42B5/30—Cartridge cases of plastics, i.e. the cartridge-case tube is of plastics

Definitions

  • the technical sector of the present invention is that of medium or large caliber ammunition, and more precisely ammunition casings.
  • the metal sleeve constitutes a reservoir of harmful gases which it carries into the turret after ejection.
  • the shutter base As for the shutter base, it also has two specific drawbacks. In fact, it has been found that the metal obturating caps have a poor seal at low pressure level, which requires the provision of additional sealing devices to obtain inside the socket sufficient pressure for the proper functioning of the ammunition. .
  • patent FR-A-2 365 096 presents, for a metal base, a rubber or silicone seal fitted on an annular bead of the base.
  • the patent FR-A-2 380 531 shows a seal having a lip making it possible to use the gas streams by converting them into a radial pressure ensuring the seal.
  • Patent FR-A-2 218 547 shows a base for a fuel socket ensuring a sealing function with respect to the wall of the barrel by means of rubber seals which are expandable under the effect of the gas pressure which is established at the inside of the socket.
  • FR-A-328 008 describes a cartridge for reusable small caliber ammunition.
  • the seal is ensured by the expansion of the case and not by the bevel of the base shown which is intended only to facilitate the introduction of the case.
  • US-A-2,564,695 describes the manufacture of a plastic sleeve to overcome the known drawbacks of paper cartridges, in order to increase their strength and rigidity.
  • the plastic case and plastic base connection is made by pressure in the absence of any bevel at the base or shoe.
  • the object of the present invention is to overcome the aforementioned drawbacks by producing obturating caps of reduced mass correctly ensuring a sealing function at low pressure level, that is to say between 0 and 15 ⁇ 10 5 Pa, without device. annex or with a very clearly simplified device, using for this purpose the deformation capacities of the material used.
  • Another object of the invention is to provide a particular embodiment of the shutter base made of non-metallic material for large caliber ammunition, making it possible to guarantee sealing in the range of pressure levels used in ammunition of medium or large caliber.
  • Another object of the invention is to produce sockets or obturating caps ensuring better mechanical resistance to environmental stresses than the devices currently used.
  • Another object is to improve the connection between the shutter base and the combustible case.
  • the invention also aims to obtain reduced manufacturing costs in large series.
  • the subject of the invention is therefore a shutter cap for medium or large caliber ammunition made of a non-metallic material having a modulus of elasticity of between 1000 and 10,000 M Pascal, cap having a tubular part integral with the combustible case of the ammunition, the case being engaged in the tubular part, and a circular rear flange carrying an axial bore intended for the installation of a primer holder tube; such a device is part of the state of the art.
  • the base according to the invention is characterized in that the section of the front of the tubular outlet comprises a bevel from the inside to the outside, without contact with the external surface of the case, the bevel being applied to the wall of the barrel of the weapon by deformation after combustion of the holster, to ensure the tightness of the ammunition at low pressure level.
  • the base comprises between the tubular part and the case a foam gasket loaded with combustible material.
  • the base has a metal insert comprising a rear pellet and a tubular part of small section.
  • the non-metallic material of the base is overmolded on the metallic insert.
  • the non-metallic material of the base is charged with a material conducting the current electrical, to ensure the electrical connection between the electrical primer and the shutter base.
  • the base according to the invention comprises a tubular part 1 intended to allow the base to be secured to the case of the ammunition and to carry out the sealing function fulfilled by the invention, and a circular rear flange 2 comprising a shoulder 3 intended to come to bear on the rear of the barrel of the weapon.
  • the flange 2 has in its center a threaded axial bore 4 intended for the installation of a primer holder tube of conventional type.
  • the base is made of a non-metallic material having a modulus of elasticity of between 1000 MPascal and 10000 MPascal.
  • the base can thus be made of a plastic material such as polyester, polyvinyl chloride or polyethylene.
  • the section of the tubular part 1 decreases from the flange 2 to its free front end and ends with a bevel 5 made from the inside towards the outside, this arrangement allowing a radial deformation towards the outside under the effect of the removal without the shell of the ammunition during firing in order to ensure the tightness of the ammunition at low pressure level.
  • FIG. 3 shows an alternative embodiment according to which the shutter base made of non-metallic material comprises a metal insert intended to obtain good mechanical strength of the base and to control the radial elastic deformation of the latter during firing.
  • This insert comprises a rear pellet 6 with a diameter slightly greater than the caliber of the ammunition so that the pellet 6 projects beyond the inside of the shoulder 3 to ensure its rigidity.
  • This pellet 6 is integral with a tubular part of small section 7 which penetrates inside the tubular part 1 of the base and whose free end is located at the base of the bevel 5 of the base. Obtaining a base comprising such an insert can be achieved by molding the non-metallic material on the insert.
  • Figures 4 and 5 are shown two means of connecting the base on a possibly combustible case.
  • the case is assembled by gluing on the internal part 8 of the tubular part 1 of the base.
  • the internal part 8 has the shape of an annular bowl on which rests an annular rounding 9 of the rear part of the case 10.
  • the assembly only includes a bonding on the part internal 8 of the base and not on the bevel 5 so as not to oppose the radial deformation of the base during firing.
  • a foam 11 comprising a binder loaded with combustible material.
  • the elasticity of the foam is determined by the rate of loading of combustible material, which allows perfect control of the coupling of the base and the case.
  • such a very flexible seal 11 provides excellent sealing at a very low pressure level and disappears entirely during the combustion phase.
  • the electrical connection can be made, either by a metallic ground connection, or preferably by adding conductive material to the mass of the non-metallic material of the base.
  • the invention has the advantage of ensuring a more secure connection between the shutter base and the combustible case of the ammunition and of greatly improving the seal at very low pressure level in the gun barrel.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)
  • Gasket Seals (AREA)
  • Operating, Guiding And Securing Of Roll- Type Closing Members (AREA)
  • Adornments (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Forging (AREA)
  • Installation Of Indoor Wiring (AREA)
  • Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)

Abstract

1. An obturator-base for medium-or large-caliber ammunition made of a non-metallic material with a modulus of elasticity ranging from 1000 to 10 000 MPascals, said base comprising a tubular portion (1) integral with the combustible case (10) of the ammunition, the case being engaged into the tubular portion and a rear disk (2) having an axial bore (4) intended to accommodate a primer-tube, characterized in that the front part of the tubular portion pressenting a bevel (5) slanted from the inside to the outside, without any point of contact with the outer surface of the case, the bevel being applied to the wall of the case, the bevel being applied to the wall of the weapon barrel due to its deformation after the combustion of the case, so as to ensure the tightness of the ammunition at a low level of pressure.

Description

Le secteur technique de la présente invention est celui des munitions de moyen ou de gros calibre, et plus précisément des douilles de munitions.The technical sector of the present invention is that of medium or large caliber ammunition, and more precisely ammunition casings.

Actuellement, les munitions de gros ou moyen calibre emploient soit une douille entièrement métallique, soit un culot obturateur métallique associé à un étui combustible.Currently, large or medium-caliber ammunition uses either a fully metallic cartridge case or a metallic shutter base associated with a combustible case.

Ces solutions ont pour inconvénients communs d'avoir une masse élevée, de présenter après tir un résidu dans la tourelle et de nécessiter une protection de la chambre de l'arme contre la corrosion.These solutions have the common disadvantages of having a high mass, of presenting after firing a residue in the turret and of requiring protection of the chamber of the weapon against corrosion.

De plus, la douille métallique constitue un réservoir de gaz nocifs qu'elle entraîne dans la tourelle après éjection.In addition, the metal sleeve constitutes a reservoir of harmful gases which it carries into the turret after ejection.

Quant au culot obturateur, il présente en outre deux inconvénients spécifiques. En effet, on a constaté que les culots obturateurs métalliques présentent une mauvaise étanchéité à bas niveau de pression, ce qui nécessite de prévoir des dispositifs annexes d'étanchéité pour obtenir à l'intérieur de la douille une pression suffisante au bon fonctionnement de la munition.As for the shutter base, it also has two specific drawbacks. In fact, it has been found that the metal obturating caps have a poor seal at low pressure level, which requires the provision of additional sealing devices to obtain inside the socket sufficient pressure for the proper functioning of the ammunition. .

Ainsi, le brevet FR-A-2 365 096 présente pour un culot métallique, une garniture d'étanchéité en caoutchouc ou en silicone monté sur un bourrelet annulaire du culot.Thus, patent FR-A-2 365 096 presents, for a metal base, a rubber or silicone seal fitted on an annular bead of the base.

Le brevet FR-A-2 380 531 montre un joint d'étanchéité possédant une lèvre permettant d'utiliser les courants gazeux en les convertissant en une pression radiale assurant l'étanchéité.The patent FR-A-2 380 531 shows a seal having a lip making it possible to use the gas streams by converting them into a radial pressure ensuring the seal.

Le brevet FR-A-2 218 547 montre un culot pour douille combustible assurant une fonction d'étanchéité vis à vis de la paroi du canon au moyen de joints caoutchoucs expansibles sous l'effet de la pression gazeuse qui s'établit à l'intérieur de la douille.Patent FR-A-2 218 547 shows a base for a fuel socket ensuring a sealing function with respect to the wall of the barrel by means of rubber seals which are expandable under the effect of the gas pressure which is established at the inside of the socket.

Ainsi qu'on le voit, tous ces dispositifs d'étanchéité sont constitués d'éléments rapportés sur le culot, dont la fonction étanchéité n'est pas toujours parfaitement remplie et qui peuvent même créer de plus des problèmes d'extraction du culot après le tir de projectile.As can be seen, all these sealing devices are made up of elements attached to the base, the sealing function of which is not always perfectly fulfilled and which can even create problems of extraction of the base after the projectile fire.

Un autre inconvénient des culots obturateurs actuels utilisés avec des étuis combustibles est de réaliser fort imparfaitement la liaison avec l'étui en raison de la différence de nature des matériaux employés.Another drawback of current shutter caps used with combustible cases is that they are very imperfectly bonded with the case because of the difference in the nature of the materials used.

Dans le domaine des munitions de petit calibre où les pressions développées sont faibles de l'ordre de 8.107 à 108 Pa, on a utilisé des matériaux plastiques pour réaliser les douilles. Ainsi les brevets WO-A-83 00 213 et FR-A-1 294 551 montrent de telles douilles. Toutefois, ce type de dispositif n'a jamais été utilisé dans les munitions de moyen ou gros calibre, car il n'avait jamais été possible de résoudre les problèmes d'étanchéité avec les pressions développées de l'ordre de 7.108 à 109 Pa dans de telles munitions.In the field of small caliber ammunition where the pressures developed are low of the order of 8.10 7 to 10 8 Pa, plastic materials have been used to produce the sockets. Thus the patents WO-A-83 00 213 and FR-A-1 294 551 show such sockets. However, this type of device was never used in ammunition of medium or large caliber, because it had never been possible to solve the sealing problems with the developed pressures of the order of 7.10 8 to 10 9 Pa in such ammunition.

Le brevet FR-A-328 008 décrit une cartouche pour munitions de petit calibre réutilisable. L'étanchéité est assurée par la dilatation de l'étui et non pas par le biseau du culot représenté qui est destiné uniquement à faciliter l'introduction de l'étui.FR-A-328 008 describes a cartridge for reusable small caliber ammunition. The seal is ensured by the expansion of the case and not by the bevel of the base shown which is intended only to facilitate the introduction of the case.

Le brevet US-A-2 564 695 décrit la fabrication d'une douille en plastique pour pallier les inconvénients connus des cartouches en papier, afin d'augmenter leur résistance et leur rigidité. La liaison étui plastique et culot plastique est réalisée par pression en l'absence de tout biseau au niveau du culot ou sabot.US-A-2,564,695 describes the manufacture of a plastic sleeve to overcome the known drawbacks of paper cartridges, in order to increase their strength and rigidity. The plastic case and plastic base connection is made by pressure in the absence of any bevel at the base or shoe.

La présente invention a pour but de s'affranchir des inconvénients précités en réalisant des culots obturateurs de masse réduite assurant correctement une fonction d'étanchéité à bas niveau de pression, c'est-à-dire entre 0 et 15.105 Pa, sans dispositif annexe ou avec un dispositif très nettement simplifié, utilisant pour ce faire les capacités de déformation du matériau employé.The object of the present invention is to overcome the aforementioned drawbacks by producing obturating caps of reduced mass correctly ensuring a sealing function at low pressure level, that is to say between 0 and 15 × 10 5 Pa, without device. annex or with a very clearly simplified device, using for this purpose the deformation capacities of the material used.

Un autre but de l'invention est de fournir un mode particulier de réalisation du culot obturateur en matériau non métallique pour munition de gros calibre, permettant de garantir l'étanchéité dans la gamme de niveaux de pression mis en oeuvre dans les munitions de moyen ou gros calibre.Another object of the invention is to provide a particular embodiment of the shutter base made of non-metallic material for large caliber ammunition, making it possible to guarantee sealing in the range of pressure levels used in ammunition of medium or large caliber.

Un autre but de l'invention est de réaliser des douilles ou des culots obturateurs assurant une meilleure tenue mécanique aux sollicitations d'environnement que les dispositifs actuellement employés.Another object of the invention is to produce sockets or obturating caps ensuring better mechanical resistance to environmental stresses than the devices currently used.

Un autre but est d'améliorer la liaison entre le culot obturateur et l'étui combustible.Another object is to improve the connection between the shutter base and the combustible case.

Enfin, l'invention a également pour but d'obtenir des coûts de fabrication réduits en grande série.Finally, the invention also aims to obtain reduced manufacturing costs in large series.

L'invention a donc pour objet un culot obturateur pour munitions de moyen ou de gros calibre réalisé en un matériau non métallique possédant un module d'élasticité compris entre 1000 et 10000 M Pascal, culot présentant une partie tubulaire solidaire de l'étui combustible de la munition, l'étui étant engagé dans la partie tubulaire, et un flasque arrière circulaire portant un alésage axial destiné à la mise en place d'un tube porte-amorce; un tel dispositif fait partie de l'état de la technique.The subject of the invention is therefore a shutter cap for medium or large caliber ammunition made of a non-metallic material having a modulus of elasticity of between 1000 and 10,000 M Pascal, cap having a tubular part integral with the combustible case of the ammunition, the case being engaged in the tubular part, and a circular rear flange carrying an axial bore intended for the installation of a primer holder tube; such a device is part of the state of the art.

Le culot selon l'invention est caractérisé en ce que la section de l'avant de la sortie tubulaire comporte un biseau de l'intérieur vers l'extérieur, sans contact avec la surface externe de l'étui, le biseau s'appliquant sur la paroi du tube de l'arme par déformation après combustion de l'étui, pour assurer l'étanchéité de la munition à bas niveau de pression.The base according to the invention is characterized in that the section of the front of the tubular outlet comprises a bevel from the inside to the outside, without contact with the external surface of the case, the bevel being applied to the wall of the barrel of the weapon by deformation after combustion of the holster, to ensure the tightness of the ammunition at low pressure level.

Le culot comporte entre la partie tubulaire et l'étui un joint d'étanchéité en mousse chargée de matière combustible.The base comprises between the tubular part and the case a foam gasket loaded with combustible material.

Le culot comporte un insert métallique comprenant une pastille arrière et une partie tubulaire de faible section.The base has a metal insert comprising a rear pellet and a tubular part of small section.

Le matériau non métallique du culot est surmoulé sur l'insert métallique.The non-metallic material of the base is overmolded on the metallic insert.

Lorsque la munition est équipée d'une amorce électrique, le matériau non métallique du culot est chargé d'une matière conductrice du courant électrique, pour assurer la liaison électrique entre l'amorce électrique et le culot obturateur.When the ammunition is equipped with an electrical primer, the non-metallic material of the base is charged with a material conducting the current electrical, to ensure the electrical connection between the electrical primer and the shutter base.

D'autres particularités de l'invention seront décrites en regard de la description qui va suivre et des planches de dessins montrant de façon non limitative des modes de réalisation de l'invention.

  • La figure 1 représente un culot selon l'invention, de face (figure 1 A) et en coupe AA de là figure 1 A (figure 1 B).
  • La figure 2 montre un schéma d'un mode simplifié de réalisation du culot de la figure 1.
  • La figure 3 montre un culot selon l'invention muni d'un insert métallique.
  • La figure 4 montre l'assemblage par collage d'un culot selon les variantes précédentes avec un étui combustible.
  • La figure 5 montre une variante où la liaison avec l'étui combustible est réalisée au moyen d'un joint d'étanchéité combustible.
Other features of the invention will be described with reference to the description which follows and to drawing boards showing, without limitation, embodiments of the invention.
  • Figure 1 shows a base according to the invention, from the front (Figure 1 A) and in section AA from there Figure 1 A (Figure 1 B).
  • FIG. 2 shows a diagram of a simplified embodiment of the base of FIG. 1.
  • Figure 3 shows a base according to the invention provided with a metal insert.
  • Figure 4 shows the assembly by bonding of a base according to the preceding variants with a combustible case.
  • Figure 5 shows a variant where the connection with the combustible case is made by means of a combustible gasket.

En regard de la figure 1, le culot selon l'invention comporte une partie tubulaire 1 destinée à permettre la solidarisation du culot avec l'étui de la munition et à réaliser la fonction étanchéité remplie par l'invention, et un flasque arrière circulaire 2 comportant une épaulement 3 destiné à venir en appui sur l'arrière du tube de l'arme.With reference to FIG. 1, the base according to the invention comprises a tubular part 1 intended to allow the base to be secured to the case of the ammunition and to carry out the sealing function fulfilled by the invention, and a circular rear flange 2 comprising a shoulder 3 intended to come to bear on the rear of the barrel of the weapon.

Le flasque 2 comporte en son centre un alésage axial fileté 4 destiné à la mise en place d'un tube porte-amorce de type classique.The flange 2 has in its center a threaded axial bore 4 intended for the installation of a primer holder tube of conventional type.

Selon une caractéristique fondamentale de l'invention, le culot est réalisé en un matériau non métallique possédant un module d'élasticité compris entre 1000 MPascal et 10000 MPascal. Le culot peut ainsi être réalisé en une matière plastique telle que du polyester, du polychlorure de vinyle ou du polyéthylène. De plus, pour utiliser cette caractéristique d'élasticité, la section de la partie tubulaire 1 est décroissante depuis la flasque 2 jusqu'à son extrémité libre avant et se termine par un biseau 5 réalisé de l'intérieur vers l'extérieur, cette disposition permettant une déformation radiale vers l'extérieur sous l'effet de la suppression sans la douille de la munition lors du tir afin d'assurer l'étanchéité de la munition à bas niveau de pression.According to a fundamental characteristic of the invention, the base is made of a non-metallic material having a modulus of elasticity of between 1000 MPascal and 10000 MPascal. The base can thus be made of a plastic material such as polyester, polyvinyl chloride or polyethylene. In addition, to use this characteristic of elasticity, the section of the tubular part 1 decreases from the flange 2 to its free front end and ends with a bevel 5 made from the inside towards the outside, this arrangement allowing a radial deformation towards the outside under the effect of the removal without the shell of the ammunition during firing in order to ensure the tightness of the ammunition at low pressure level.

La figure 3 montre une variante de réalisation selon laquelle le culot obturateur en matériau non métallique comprend un insert métallique destiné à obtenir une bonne tenue mécanique du culot et à contrôler la déformation élastique radiale de celui-ci lors du tir. Cet insert comprend une pastille arrière 6 d'un diamètre légèrement supérieur au calibre de la munition de façon à ce que la pastille 6 déborde à l'intérieur de l'épaulement 3 pour en assurer la rigidité. De cette pastille 6 est solidaire une partie tubulaire de faible section 7 qui pénètre à l'intérieur de la partie tubulaire 1 du culot et dont l'extrémité libre se situe au niveau de la base du biseau 5 du culot. L'obtention d'un culot comportant un tel insert peut être réalisée par surmoulage du matériau non métallique sur l'insert.FIG. 3 shows an alternative embodiment according to which the shutter base made of non-metallic material comprises a metal insert intended to obtain good mechanical strength of the base and to control the radial elastic deformation of the latter during firing. This insert comprises a rear pellet 6 with a diameter slightly greater than the caliber of the ammunition so that the pellet 6 projects beyond the inside of the shoulder 3 to ensure its rigidity. This pellet 6 is integral with a tubular part of small section 7 which penetrates inside the tubular part 1 of the base and whose free end is located at the base of the bevel 5 of the base. Obtaining a base comprising such an insert can be achieved by molding the non-metallic material on the insert.

Aux figures 4 et 5 sont représentés deux moyens de liaison du culot sur un étui éventuellement combustible. Selon la figure 4, l'étui est assemblé par collage sur la partie interne 8 de la partie tubulaire 1 du culot. La partie interne 8 a une forme de cuvette annulaire sur laquelle vient reposer un arrondi annulaire 9 de la partie arrière de l'étui 10. Ainsi qu'on le voit à la figure 4, l'assemblage ne comporte un collage que sur la partie interne 8 du culot et non sur le biseau 5 de façon à ne pas contrarier la déformation radiale du culot lors du tir.In Figures 4 and 5 are shown two means of connecting the base on a possibly combustible case. According to Figure 4, the case is assembled by gluing on the internal part 8 of the tubular part 1 of the base. The internal part 8 has the shape of an annular bowl on which rests an annular rounding 9 of the rear part of the case 10. As can be seen in FIG. 4, the assembly only includes a bonding on the part internal 8 of the base and not on the bevel 5 so as not to oppose the radial deformation of the base during firing.

Selon le mode d'assemblage de la figure 5 destiné plus particulièrement à la mise en place d'un étui combustible, on introduit entre l'étui 10 et le culot une mousse 11 comprenant un liant chargé de matière combustible. L'élasticité de la mousse est déterminée par le taux de chargement en matière combustible, qui permet de contrôler parfaitement l'accouplement du culot et de l'étui.According to the assembly mode of Figure 5 intended more particularly for the establishment of a combustible case, is introduced between the case 10 and the base a foam 11 comprising a binder loaded with combustible material. The elasticity of the foam is determined by the rate of loading of combustible material, which allows perfect control of the coupling of the base and the case.

Un tel assemblage est très favorable à la tenue de la munition,notamment au cours des essais d'environnement.Such an assembly is very favorable to the behavior of the ammunition, in particular during environmental tests.

De plus, un tel joint 11 très souple assure une excellente étanchéité à très bas niveau de pression et disparait entièrement pendant la phase de combustion.In addition, such a very flexible seal 11 provides excellent sealing at a very low pressure level and disappears entirely during the combustion phase.

Toutes les variantes représentées ci-dessus comportent un alésage centrale 4 destiné à recevoir un tube porte-amorce, soit classique, soit combustible.All the variants shown above include a central bore 4 intended to receive a primer holder tube, either conventional or combustible.

Dans le cas d'un amorçage électrique la liaison électrique peut être réalisée, soit par une connexion métallique de masse, soit de façon préférée par l'adjonction de matière conductrice dans la masse du matériau non métallique du culot.In the case of an electrical ignition, the electrical connection can be made, either by a metallic ground connection, or preferably by adding conductive material to the mass of the non-metallic material of the base.

Ainsi qu'il ressort de ce qui précède, l'invention a pour avantage d'assurer une liaison plus sûre entre le culot obturateur et l'étui combustible des munitions et d'améliorer grandement l'étanchéité à très bas niveau de pression dans le tube de l'arme.As is apparent from the above, the invention has the advantage of ensuring a more secure connection between the shutter base and the combustible case of the ammunition and of greatly improving the seal at very low pressure level in the gun barrel.

Claims (5)

1. An obturator-base for medium-or large-caliber ammunition made of a non-metallic material with a modulus of elasticity ranging from 1000 to 10 000 M Pascals, said base comprising a tubular portion (1) integral with the combustible case (10) of the ammunition, the case being engaged into the tubular portion and a rear disk (2) having an axial bore (4) intended to accommodate a primer-tube, characterized in that the front part of the tubular portion presenting a bevel (5) slanted from the inside to the outside, without any point of contact with the outer surface of the case, the bevel being applied to the wall of the weapon barrel due to its deformation after the combustion of the case, so as to ensure the tightness of the ammunition at a low level of pressure.
2. An obturator-base as claimed in Claim 1, characterized in that it includes, between the tubular portion (1) and the case (10), a seal (11) made from a foam loaded with a combustible material.
3. An obturator-base as claimed in any of Claims 1 or 2, characterized in that it includes a metallic insert comprising a rear pellet (6) and a tubular portion (7) with a small section.
4. An obturator-base as claimed in Claim 3, characterized in that the non-metallic material of the base is molded over the metallic insert (6, 7).
5. An obturator-base as claimed in any one of Claims 1 through 4, fitted with an electric primer characterized in that the non-metallic material of the base is loaded with an electrically conductive material in order to establish electrical connection between the electric primer and the obturator-base.
EP84402665A 1983-12-22 1984-12-20 Base wad of plastics material Expired EP0147314B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84402665T ATE34837T1 (en) 1983-12-22 1984-12-20 PLASTIC FLOOR BODY.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8320532 1983-12-22
FR8320532A FR2557285B1 (en) 1983-12-22 1983-12-22 NON-METALLIC MATERIAL SHUTTER

Publications (3)

Publication Number Publication Date
EP0147314A2 EP0147314A2 (en) 1985-07-03
EP0147314A3 EP0147314A3 (en) 1985-08-07
EP0147314B1 true EP0147314B1 (en) 1988-06-01

Family

ID=9295427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84402665A Expired EP0147314B1 (en) 1983-12-22 1984-12-20 Base wad of plastics material

Country Status (6)

Country Link
EP (1) EP0147314B1 (en)
AT (1) ATE34837T1 (en)
DE (1) DE3471740D1 (en)
ES (1) ES295770Y (en)
FR (1) FR2557285B1 (en)
NO (1) NO157633C (en)

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Publication number Priority date Publication date Assignee Title
DE4229559C2 (en) * 1992-09-04 2000-12-07 Rheinmetall W & M Gmbh Casing base for large-caliber ammunition

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
DE102020001052A1 (en) 2020-02-19 2021-08-19 Nitrochemie Aschau Gmbh Sleeve jacket

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Also Published As

Publication number Publication date
FR2557285B1 (en) 1986-12-19
EP0147314A2 (en) 1985-07-03
ES295770U (en) 1987-04-16
ES295770Y (en) 1987-12-01
NO157633C (en) 1988-04-20
NO157633B (en) 1988-01-11
FR2557285A1 (en) 1985-06-28
NO845200L (en) 1985-06-24
ATE34837T1 (en) 1988-06-15
DE3471740D1 (en) 1988-07-07
EP0147314A3 (en) 1985-08-07

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