EP1985965B1 - Elastic retaining ring for retaining combustible casing - Google Patents

Elastic retaining ring for retaining combustible casing Download PDF

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Publication number
EP1985965B1
EP1985965B1 EP08290009A EP08290009A EP1985965B1 EP 1985965 B1 EP1985965 B1 EP 1985965B1 EP 08290009 A EP08290009 A EP 08290009A EP 08290009 A EP08290009 A EP 08290009A EP 1985965 B1 EP1985965 B1 EP 1985965B1
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EP
European Patent Office
Prior art keywords
ring
elastic
ring according
elastic ring
slot
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.)
Not-in-force
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EP08290009A
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German (de)
French (fr)
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EP1985965A1 (en
Inventor
Joël Leblond
Jacques Bachelier
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Nexter Munitions SA
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Nexter Munitions SA
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Publication date
Application filed by Nexter Munitions SA filed Critical Nexter Munitions SA
Publication of EP1985965A1 publication Critical patent/EP1985965A1/en
Application granted granted Critical
Publication of EP1985965B1 publication Critical patent/EP1985965B1/en
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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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S102/00—Ammunition and explosives
    • Y10S102/70—Combustilbe cartridge

Definitions

  • the technical field of the invention is that of the means for maintaining an ammunition fuel case with respect to a base.
  • This washer has a cup-shaped profile whose base matches the internal profile of the case.
  • An angle is provided between a horizontal plane and the bottom of the bowl to give some rigidity to the connection.
  • This washer has the disadvantage of generating a radial force on the fuel bushing during any axial driving. Such a radial force is all the more annoying that such a washer is rather rigid and may cut the sleeve.
  • An elastic retaining ring according to the preamble of claim 1 is known from the document FR 2 365 096 A .
  • the subject of the invention is an elastic ring for holding a combustible case of ammunition with respect to a base, said ring comprising two substantially annular concentric portions, connected by radial arms, said portions being continuous or not, the portion of larger diameter having at least one flat portion characterized in that the radial arms form an angle relative to the plane of this flat portion.
  • the two annular portions may be flat and parallel to each other.
  • the ring may comprise an opening disposed between two consecutive arms, the outer annular portion having extensions extending radially in each opening.
  • Each extension can be pierced.
  • the outer ring may carry slots regularly distributed angularly, each slot being disposed equidistant from two consecutive arms.
  • the inner ring may have slots evenly spaced angularly, each slot being disposed equidistant from two consecutive arms.
  • the outer ring of the ring is separated into annular sectors, each sector being integral with an arm.
  • the inner ring can carry a slot and it can carry a hole on each side of this slot, holes for receiving a tool for positioning the ring on the base.
  • Each annular sector may advantageously comprise curved ends.
  • the figure 1 shows the rear part of a munition 1 for artillery comprising a fuel case 2 which is fixed a shutter base 3.
  • the shutter cap comprises an axial support 4 for receiving an igniter tube (not shown).
  • the fuel case 2 comprises a cylindrical portion 2a which is extended by a substantially plane annular bottom 2c.
  • the bottom 2c is connected to the cylindrical portion 2a by a portion 2b forming a cup and which substantially matches the internal profile 3a of the base 3.
  • the mechanical fastening of the case 2 and the base 3 is provided by an elastic ring 5 which is secured to the axial support 4 by a connecting means, for example a split stop (known as a circlip) 6 arranged in a groove of support 4.
  • a connecting means for example a split stop (known as a circlip) 6 arranged in a groove of support 4.
  • the elastic ring 5 comprises two substantially annular and concentric portions 5a, 5b.
  • An inner portion 5a surrounds the axial support 4 and has substantially the same diameter as the latter. It is in support against the stop 6 which is lodged in the throat.
  • the ring 5 also comprises a peripheral portion 5b which bears against the bottom 2c of the case 2.
  • the annular portion 5b comprises at least one plane portion.
  • the entire peripheral portion 5b is flat.
  • portion 5a is here also flat and the portions 5a, 5b are parallel to each other.
  • the circular portions 5a, 5b are connected by substantially radial arms 7 which form an angle ⁇ relative to the plane of said portions 5a, 5b.
  • the force transmitted to the bottom 2c of the case can be easily controlled by the dimensioning of the radial arms 7.
  • stop ring 6 It is of course possible to implement another connection means that the stop ring 6. It may for example use a nut screwed on the support 4 with possibly interposed a washer between the nut and the ring 5.
  • the portion 5a may not be flat, for example have a curved or wavy shape.
  • the flat portion 5b ensures in accordance with the invention the transfer and the optimal distribution of the forces received while avoiding radial forces on the case.
  • FIGS. 3a and 3b show a first embodiment of a ring according to the invention.
  • the elastic ring comprises two crowns 5a and 5b continuous therefore devoid of slots.
  • the rings 5a and 5b are connected by six arms 7 regularly distributed angularly and an opening 8 is disposed between two consecutive arms 7.
  • outer annular portion 5b has extensions 9 which extend radially in each opening towards the center of the ring 5.
  • Each extension 9 is delimited by a substantially circular profile and it comprises a bore 10. This drilling makes it possible to limit the unburnt of the case 2 after firing.
  • This embodiment also makes it possible to greatly reduce the forces experienced by the fuel holster.
  • each slot being disposed at an equal distance from two consecutive arms 7.
  • the deformation characteristic of the ring does not have the same shape as before. This characteristic is given by curve 14 of the figure 2 .
  • FIGS. 5a and 5b show another embodiment of a ring according to the invention which is also the preferred embodiment.
  • the outer ring 5b is separated into annular sectors 13 (here four sectors) separated by notches 14 which open on the openings 8.
  • Each annular sector 13 is thus integral with an arm 7 and the sector is symmetrical with respect to said arms.
  • each sector 13 will have a length of between 15% and 23% of the circumference of the outer ring 5b.
  • the notches 14 will have a width of between 2% and 10% of said circumference.
  • the inner ring 5a is continuous and it can be held on the support 4 by a suitable connecting means (stop ring, screwed nut ).
  • This embodiment of the invention has the advantage of allowing a completely independent deformation of each arm 7. This results in increased flexibility. Moreover, the force is here directly proportional to the displacement of each solicited zone and this embodiment makes it possible to obtain a useful displacement amplitude which is greater than that obtained with the preceding modes (approximately 100% of useful displacement in addition).
  • the figure 6 shows a variant of this embodiment in which the inner ring 5a carries a single slot 15.
  • the inner ring carries a hole 16 on each side of the slot 15. These holes are intended to receive a tool (not shown) for positioning the ring 5 on the support 4 of the base 3.
  • the inner ring 5a may have a width that increases regularly between the slot 15 and a zone diametrically opposite the slot 15.
  • the inner ring will be configured as a split stop or circlips. It can therefore be directly positioned in a groove of the support 4 without it being necessary to provide a complementary connecting means such as the split stop 6 of the figure 1 .
  • the assembly is thus simplified and the number of parts is reduced.
  • each annular sector 13 has curved ends 17.
  • This variant has the advantage of avoiding any degradation or cutting of the bottom 2c of the fuel case by the ends of the sectors 13 in case of relative movement between these elements.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
  • Casings For Electric Apparatus (AREA)
  • Laminated Bodies (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • Dowels (AREA)
  • Clamps And Clips (AREA)
  • Adornments (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Bolts, Nuts, And Washers (AREA)

Abstract

The ring (5) has two internal and external concentric and annular portions (5a, 5b) e.g. crowns, which are linked by radial arms (7), where the portions are continuous or non-continuous and are plane and parallel to each other. One of the portions (5b) has a large diameter and comprises a plane part, and the other portion (5a) is configured as a snap ring or a circlip. The radial arms form an angle (teta) with respect to a plane of the plane part. The portion (5b) has pierced extensions extending in an opening, and is separated into annular sectors, where each sector has curved extremities.

Description

Le domaine technique de l'invention est celui des moyens de maintien d'un étui combustible de munition par rapport à un culot.The technical field of the invention is that of the means for maintaining an ammunition fuel case with respect to a base.

On connaît par le brevet WO03/014654 un moyen de maintien comprenant une rondelle percée qui autorise les déplacements du culot par rapport à l'étui.We know by the patent WO03 / 014654 a holding means comprising a pierced washer which allows movement of the base relative to the case.

Cette rondelle comporte un profil en forme de cuvette dont la base épouse le profil interne de l'étui.This washer has a cup-shaped profile whose base matches the internal profile of the case.

Un angle est prévu entre un plan horizontal et le fond de la cuvette afin de donner une certaine rigidité à la liaison.An angle is provided between a horizontal plane and the bottom of the bowl to give some rigidity to the connection.

Cette rondelle présente comme inconvénient d'engendrer un effort radial sur la douille combustible lors de tout enfoncement axial. Un tel effort radial est d'autant plus gênant qu'une telle rondelle est plutôt rigide et risque de découper la douille.This washer has the disadvantage of generating a radial force on the fuel bushing during any axial driving. Such a radial force is all the more annoying that such a washer is rather rigid and may cut the sleeve.

De plus en cas de montage précontraint, la surface de contact de cette rondelle avec le fond de douille combustible est pratiquement une ligne circulaire. Il en résulte une fragilisation du fond de douille qui est préjudiciable à sa tenue mécanique lors des sollicitations ultérieures.Moreover, in the case of prestressed mounting, the contact surface of this washer with the fuel socket bottom is practically a circular line. This results in weakening of the socket bottom which is detrimental to its mechanical strength during subsequent solicitations.

Un anneau élastique de maintien selon le préambule de la revendication 1 est connu du document FR 2 365 096 A .An elastic retaining ring according to the preamble of claim 1 is known from the document FR 2 365 096 A .

C'est le but de l'invention que de proposer un anneau élastique de maintien assurant un maintien fiable du culot et de l'étui tout en évitant tout effort radial sur l'étui et en autorisant néanmoins les déplacements limités du culot par rapport à l'étui avec un effort minimal sur l'étui. Ces déplacements limités permettront de ramener le culot à sa position initiale après une sollicitation mécanique.It is the object of the invention to provide a resilient retaining ring ensuring a reliable hold of the base and the case while avoiding any radial force on the case and allowing nevertheless limited movements of the base relative to the case with minimal effort on the case. These limited movements will bring the pellet back to its original position after a mechanical stress.

Ainsi l'invention a pour objet un anneau élastique de maintien d'un étui combustible de munition par rapport à un culot, ledit anneau comprenant deux portions sensiblement annulaires concentriques, reliées par des bras radiaux, lesdites portions étant continues ou non, la portion de plus grand diamètre comportant au moins une partie plane caractérisé en ce que les bras radiaux forment un angle par rapport au plan de cette partie plane.Thus, the subject of the invention is an elastic ring for holding a combustible case of ammunition with respect to a base, said ring comprising two substantially annular concentric portions, connected by radial arms, said portions being continuous or not, the portion of larger diameter having at least one flat portion characterized in that the radial arms form an angle relative to the plane of this flat portion.

Avantageusement, les deux portions annulaires pourront être planes et parallèles entre elles.Advantageously, the two annular portions may be flat and parallel to each other.

Selon une caractéristique, l'anneau pourra comporter une ouverture disposée entre deux bras consécutifs, la portion annulaire externe comportant des prolongements s'étendant radialement dans chaque ouverture.According to one characteristic, the ring may comprise an opening disposed between two consecutive arms, the outer annular portion having extensions extending radially in each opening.

Chaque prolongement pourra être percé.Each extension can be pierced.

Selon d'autres modes de réalisation, la couronne externe pourra porter des fentes régulièrement réparties angulairement, chaque fente étant disposée à égale distance de deux bras consécutifs.According to other embodiments, the outer ring may carry slots regularly distributed angularly, each slot being disposed equidistant from two consecutive arms.

La couronne interne pourra porter des fentes régulièrement réparties angulairement, chaque fente étant disposée à égale distance de deux bras consécutifs.The inner ring may have slots evenly spaced angularly, each slot being disposed equidistant from two consecutive arms.

Selon un mode de réalisation préféré de l'invention, la couronne externe de l'anneau est séparée en secteurs annulaires, chaque secteur étant solidaire d'un bras.According to a preferred embodiment of the invention, the outer ring of the ring is separated into annular sectors, each sector being integral with an arm.

La couronne interne pourra porter une fente et elle pourra porter un trou de chaque côté de cette fente, trous destinés à recevoir un outil permettant le positionnement de l'anneau sur le culot.The inner ring can carry a slot and it can carry a hole on each side of this slot, holes for receiving a tool for positioning the ring on the base.

Chaque secteur annulaire pourra avantageusement comporter des extrémités recourbées.Each annular sector may advantageously comprise curved ends.

L'invention sera mieux comprise à la lecture de la description qui va suivre de différents modes de réalisation, description faite en référence aux dessins annexés et dans lesquels :

  • la figure 1 est une vue en coupe longitudinale partielle de la partie d'arrière d'une munition incorporant un anneau élastique selon l'invention,
  • la figure 2 est une courbe donnant les efforts transmis par une rondelle en fonction des déplacements axiaux relatifs,
  • les figures 3a et 3b sont deux vues d'un premier mode de réalisation d'un anneau selon l'invention, la figure 3b étant une coupe suivant le plan dont la trace AA est repérée à la figure 3a,
  • les figures 4a et 4b sont des vues de variantes de réalisation de l'anneau selon l'invention,
  • les figures 5a et 5b sont deux vues d'un autre mode de réalisation d'un anneau selon l'invention, la figure 5b étant une coupe suivant le plan dont la trace BB est repérée à la figure 5a,
  • la figure 6 montre une variante de ce mode de réalisation,
  • la figure 7 est une vue latérale d'une autre variante de réalisation.
The invention will be better understood on reading the following description of various embodiments, a description given with reference to the appended drawings and in which:
  • the figure 1 is a partial longitudinal sectional view of the rear portion of a munition incorporating an elastic ring according to the invention,
  • the figure 2 is a curve giving the forces transmitted by a washer as a function of relative axial displacements,
  • the Figures 3a and 3b are two views of a first embodiment of a ring according to the invention, the figure 3b being a section along the plane whose track AA is located at the figure 3a ,
  • the Figures 4a and 4b are views of alternative embodiments of the ring according to the invention,
  • the Figures 5a and 5b are two views of another embodiment of a ring according to the invention, the figure 5b being a section along the plane whose BB trace is located at the figure 5a ,
  • the figure 6 shows a variant of this embodiment,
  • the figure 7 is a side view of another alternative embodiment.

La figure 1 montre la partie arrière d'une munition 1 pour artillerie comportant un étui combustible 2 auquel est fixé un culot obturateur 3. Le culot obturateur comporte un support axial 4 destiné à recevoir un tube allumeur (non représenté).The figure 1 shows the rear part of a munition 1 for artillery comprising a fuel case 2 which is fixed a shutter base 3. The shutter cap comprises an axial support 4 for receiving an igniter tube (not shown).

L'étui combustible 2 comprend une partie cylindrique 2a qui se prolonge par un fond 2c annulaire sensiblement plan. Le fond 2c est relié à la partie cylindrique 2a par une partie 2b formant cuvette et qui épouse sensiblement le profil interne 3a du culot 3.The fuel case 2 comprises a cylindrical portion 2a which is extended by a substantially plane annular bottom 2c. The bottom 2c is connected to the cylindrical portion 2a by a portion 2b forming a cup and which substantially matches the internal profile 3a of the base 3.

La solidarisation mécanique de l'étui 2 et du culot 3 est assurée par un anneau élastique 5 qui est rendu solidaire du support axial 4 par un moyen de liaison par exemple une butée fendue (connue sous le nom de circlips) 6 disposée dans une gorge du support 4.The mechanical fastening of the case 2 and the base 3 is provided by an elastic ring 5 which is secured to the axial support 4 by a connecting means, for example a split stop (known as a circlip) 6 arranged in a groove of support 4.

Conformément à l'invention l'anneau élastique 5 comprend deux portions 5a, 5b sensiblement annulaires et concentriques. Une portion interne 5a entoure le support axial 4 et a sensiblement le même diamètre que ce dernier. Elle est en appui contre la butée 6 qui se loge dans la gorge. L'anneau 5 comporte aussi une portion périphérique 5b qui est en appui contre le fond 2c de l'étui 2.According to the invention, the elastic ring 5 comprises two substantially annular and concentric portions 5a, 5b. An inner portion 5a surrounds the axial support 4 and has substantially the same diameter as the latter. It is in support against the stop 6 which is lodged in the throat. The ring 5 also comprises a peripheral portion 5b which bears against the bottom 2c of the case 2.

Selon une caractéristique importante de l'invention la portion annulaire 5b comporte au moins une partie plane. Ici toute la portion périphérique 5b est plane.According to an important characteristic of the invention, the annular portion 5b comprises at least one plane portion. Here the entire peripheral portion 5b is flat.

Par ailleurs la portion 5a est ici également plane et les portions 5a, 5b sont parallèles entre elles.Moreover, the portion 5a is here also flat and the portions 5a, 5b are parallel to each other.

Les portions circulaires 5a, 5b sont reliées par des bras sensiblement radiaux 7 qui forment un angle θ par rapport au plan des dites portions 5a, 5b.The circular portions 5a, 5b are connected by substantially radial arms 7 which form an angle θ relative to the plane of said portions 5a, 5b.

Ainsi un effort axial F transmis à l'anneau 5 par le culot 3 se traduit par une réaction R parallèle à l'effort F et sensiblement perpendiculaire au fond 2c de l'étui.Thus an axial force F transmitted to the ring 5 by the base 3 results in a reaction R parallel to the force F and substantially perpendicular to the bottom 2c of the case.

Il n'y a donc pas d'effort radial exercé sur la partie cylindrique ou sur la cuvette 2b de l'étui.There is therefore no radial force exerted on the cylindrical portion or on the bowl 2b of the holster.

L'effort transmis au fond 2c de l'étui peut être aisément maîtrisé par le dimensionnement des bras radiaux 7.The force transmitted to the bottom 2c of the case can be easily controlled by the dimensioning of the radial arms 7.

Il est bien entendu possible de mettre en oeuvre un autre moyen de liaison que la bague butée 6. On pourra par exemple utiliser un écrou vissé sur le support 4 avec éventuellement interposition d'une rondelle entre l'écrou et l'anneau 5.It is of course possible to implement another connection means that the stop ring 6. It may for example use a nut screwed on the support 4 with possibly interposed a washer between the nut and the ring 5.

La portion 5a pourrait ne pas être plane par exemple avoir une forme courbée ou ondulée.The portion 5a may not be flat, for example have a curved or wavy shape.

La portion plane 5b assure conformément à l'invention le transfert et la répartition optimale des efforts reçus tout en évitant les efforts radiaux sur l'étui.The flat portion 5b ensures in accordance with the invention the transfer and the optimal distribution of the forces received while avoiding radial forces on the case.

Les figures 3a et 3b montrent un premier mode de réalisation d'un anneau selon l'invention.The Figures 3a and 3b show a first embodiment of a ring according to the invention.

Selon ce mode, l'anneau élastique comporte deux couronnes 5a et 5b continues donc dépourvues de fentes.According to this mode, the elastic ring comprises two crowns 5a and 5b continuous therefore devoid of slots.

Les couronnes 5a et 5b sont reliées par six bras 7 régulièrement répartis angulairement et une ouverture 8 est disposée entre deux bras 7 consécutifs.The rings 5a and 5b are connected by six arms 7 regularly distributed angularly and an opening 8 is disposed between two consecutive arms 7.

Par ailleurs la portion annulaire externe 5b comporte des prolongements 9 qui s'étendent radialement dans chaque ouverture vers le centre de l'anneau 5.Furthermore, the outer annular portion 5b has extensions 9 which extend radially in each opening towards the center of the ring 5.

Ces prolongements permettent d'élargir la surface de contact entre l'anneau et le fond 2c de l'étui. On répartit ainsi les efforts transmis ce qui permet de réduire les risques de cisaillement de l'étui.These extensions make it possible to widen the contact surface between the ring and the bottom 2c of the case. This distributes the transmitted forces which reduces the risk of shearing the case.

Chaque prolongement 9 est délimité par un profil sensiblement circulaire et il comporte un perçage 10. Ce perçage permet de limiter les imbrûlés de l'étui 2 après tir.Each extension 9 is delimited by a substantially circular profile and it comprises a bore 10. This drilling makes it possible to limit the unburnt of the case 2 after firing.

Ce mode de réalisation permet par ailleurs de réduire fortement les efforts subis par l'étui combustible.This embodiment also makes it possible to greatly reduce the forces experienced by the fuel holster.

On a représenté sur la figure 2 une courbe 13 caractérisant l'effort résistant opposé par l'anneau en fonction de l'enfoncement δ dudit anneau. Cet enfoncement δ correspond à la distance entre les plans de chaque portion annulaire 5a, 5b. On constate que la caractéristique de cet anneau élastique est d'opposer un effort relativement modéré autour d'un enfoncement correspondant sensiblement à la distance maximale δM séparant les plans 5a,5b.We have shown on the figure 2 a curve 13 characterizing the resistant force opposed by the ring as a function of the depression δ of said ring. This sink δ corresponds to the distance between the planes of each annular portion 5a, 5b. It is found that the characteristic of this elastic ring is to oppose a relatively moderate force around a depression corresponding substantially to the maximum distance δM separating the planes 5a, 5b.

Un tel comportement est dû à la forme particulière de l'anneau qui comporte deux portions circulaires continues séparées par des bras formant ressorts. A partir d'un certain niveau d'enfoncement cet anneau s'approche d'un état d'équilibre mécanique qui conduit à la diminution des efforts.Such behavior is due to the particular shape of the ring which has two continuous circular portions separated by spring arms. From a certain level of depression this ring approaches a state of mechanical equilibrium which leads to the reduction of efforts.

Il en résulte qu'avec un dimensionnement approprié de cet anneau (que l'Homme du Métier réalisera aisément), il est possible d'avoir un maintien de l'étui par rapport au culot avec un effort minimal tout en autorisant des déplacements élastiques relatifs du culot par rapport à l'étui.It follows that with an appropriate dimensioning of this ring (which the skilled person will easily realize), it is possible to have the casing held relative to the base with minimal effort while allowing relative elastic movements. the base with respect to the case.

A titre d'exemple avec un anneau en acier à ressort de 1,2 mm d'épaisseur et de flèche maximale utile δM = 2,5 mm on arrive à obtenir un effort de maintien de l'ordre de 35 déca Newtons.By way of example, with a spring steel ring 1.2 mm thick and a maximum useful deflection δM = 2.5 mm, it is possible to obtain a maintenance force of around 35 deca Newtons.

Les variantes représentées aux figures 4a et 4b permettent de donner davantage de souplesse à l'anneau 5.The variants represented at Figures 4a and 4b allow to give more flexibility to the ring 5.

Suivant la figure 4a on pourra prévoir sur la couronne interne 5a des fentes 11 régulièrement réparties angulairement, chaque fente étant disposée à égale distance de deux bras 7 consécutifs.Following the figure 4a may be provided on the inner ring 5a slots 11 regularly distributed angularly, each slot being disposed at an equal distance from two consecutive arms 7.

Suivant la figure 4b on pourra réaliser des fentes 12 sur la couronne externe 5b, fentes régulièrement réparties angulairement et disposées à égale distance de deux bras 7 consécutifs. Les fentes 12 coupent ainsi les différents prolongements 9.Following the figure 4b it will be possible to make slots 12 on the outer ring 5b, slots evenly distributed angularly and arranged equidistant from two consecutive arms 7. The slots 12 thus cut the various extensions 9.

Avec ces variantes la rigidité à la déformation radiale de l'une ou l'autre des couronnes est réduite par rapport à ce qui s'observait avec le mode de réalisation des figures 3a,3b.With these variants, the stiffness at the radial deformation of one or other of the rings is reduced compared to what was observed with the embodiment of the Figures 3a, 3b .

Il en résulte que la caractéristique de déformation de l'anneau n'a pas la même forme que précédemment. Cette caractéristique est donnée par la courbe 14 de la figure 2.As a result, the deformation characteristic of the ring does not have the same shape as before. This characteristic is given by curve 14 of the figure 2 .

On notera cependant que le niveau d'efforts pour une flèche maximale de 6 mm est relativement modéré (environ 100 déca Newtons).Note however that the level of effort for a maximum deflection of 6 mm is relatively moderate (about 100 deca Newtons).

Les figures 5a et 5b montrent un autre mode de réalisation d'un anneau selon l'invention qui est également le mode de réalisation préféré.The Figures 5a and 5b show another embodiment of a ring according to the invention which is also the preferred embodiment.

Selon ce mode la couronne externe 5b est séparée en secteurs annulaires 13 (ici quatre secteurs) séparés par des entailles 14 qui débouchent sur les ouvertures 8. Chaque secteur annulaire 13 est ainsi solidaire d'un bras 7 et le secteur est symétrique par rapport audit bras.According to this mode the outer ring 5b is separated into annular sectors 13 (here four sectors) separated by notches 14 which open on the openings 8. Each annular sector 13 is thus integral with an arm 7 and the sector is symmetrical with respect to said arms.

Avec une configuration comportant quatre bras 7 et quatre secteurs annulaires 13, chaque secteur 13 aura une longueur comprise entre 15% et 23 % de la circonférence de la couronne externe 5b. Les entailles 14 auront ainsi une largeur comprise entre 2% et 10% de ladite circonférence.With a configuration comprising four arms 7 and four annular sectors 13, each sector 13 will have a length of between 15% and 23% of the circumference of the outer ring 5b. The notches 14 will have a width of between 2% and 10% of said circumference.

La couronne interne 5a est continue et elle pourra être maintenue sur le support 4 par un moyen de liaison approprié (bague butée, écrou vissé...).The inner ring 5a is continuous and it can be held on the support 4 by a suitable connecting means (stop ring, screwed nut ...).

Ce mode de réalisation de l'invention présente comme avantage d'autoriser une déformation complètement indépendante de chaque bras 7. Il en résulte une souplesse accrue. Par ailleurs l'effort est ici directement proportionnel au déplacement de chaque zone sollicitée et ce mode de réalisation permet d'obtenir une amplitude de déplacement utile qui est supérieure à celle obtenue avec les modes précédents (environ 100% de déplacement utile en plus).This embodiment of the invention has the advantage of allowing a completely independent deformation of each arm 7. This results in increased flexibility. Moreover, the force is here directly proportional to the displacement of each solicited zone and this embodiment makes it possible to obtain a useful displacement amplitude which is greater than that obtained with the preceding modes (approximately 100% of useful displacement in addition).

La figure 6 montre une variante de ce mode de réalisation dans laquelle la couronne interne 5a porte une fente unique 15.The figure 6 shows a variant of this embodiment in which the inner ring 5a carries a single slot 15.

Par ailleurs la couronne interne porte un trou 16 de chaque côté de la fente 15. Ces trous sont destinés à recevoir un outil (non représenté) permettant le positionnement de l'anneau 5 sur le support 4 du culot 3.Furthermore the inner ring carries a hole 16 on each side of the slot 15. These holes are intended to receive a tool (not shown) for positioning the ring 5 on the support 4 of the base 3.

A titre de variante la couronne interne 5a pourra avoir une largeur qui croît régulièrement entre la fente 15 et une zone diamétralement opposée à la fente 15.As a variant, the inner ring 5a may have a width that increases regularly between the slot 15 and a zone diametrically opposite the slot 15.

Ainsi la couronne interne sera configurée comme une butée fendue ou circlips. Elle pourra donc être directement positionnée dans une gorge du support 4 sans qu'il soit nécessaire de prévoir un moyen de liaison complémentaire tel que la butée fendue 6 de la figure 1. Le montage se trouve ainsi simplifié et le nombre de pièce est réduit.Thus the inner ring will be configured as a split stop or circlips. It can therefore be directly positioned in a groove of the support 4 without it being necessary to provide a complementary connecting means such as the split stop 6 of the figure 1 . The assembly is thus simplified and the number of parts is reduced.

La figure 7 montre enfin une dernière variante dans laquelle chaque secteur annulaire 13 comporte des extrémités 17 recourbées. Cette variante présente comme avantage d'éviter toute dégradation ou découpe du fond 2c de l'étui combustible par les extrémités des secteurs 13 en cas de mouvement relatif entre ces éléments.The figure 7 shows finally a last variant in which each annular sector 13 has curved ends 17. This variant has the advantage of avoiding any degradation or cutting of the bottom 2c of the fuel case by the ends of the sectors 13 in case of relative movement between these elements.

Claims (10)

  1. An elastic retention ring (5) for the combustible casing (2) of a piece of ammunition with respect to a base (3), such ring comprising two concentric, substantially ring-shaped portions (5a, 5b), linked by radial arms (7), such portions being continuous or not, the portion of the greatest diameter (5b) incorporating at least one plane part characterized in that the radial arms (7) form an angle (θ) with respect to the plane of this plane part.
  2. An elastic ring according to Claim 1, wherein the two ring-shaped portions (5a, 5b) are plane and parallel to each other.
  3. An elastic ring according to one of Claims 1 or 2, wherein an opening (8) is positioned between two consecutive arms (7), the external ring-shaped portion (5b) incorporating extensions (9) extending radially in each opening (8).
  4. An elastic ring according to Claim 3, wherein each extension (9) is pierced.
  5. An elastic ring according to one of Claims 3 or 4, wherein the external crown (5b) has slots (12) evenly spaced angularly, each slot (12) being positioned at an equal distance from two consecutive arms (7).
  6. An elastic ring according to one of Claims 3 or 4, wherein the internal crown (5a) has slots (11) evenly spaced angularly, each slot (11) being positioned at an equal distance from two consecutive arms (7).
  7. An elastic ring according to one of Claims 1 or 2, wherein the external crown (5b) is separated into ring-shaped sectors (13), each sector being integral with an arm (7).
  8. An elastic ring according to Claim 7, wherein the internal crown (5a) has a slot (15).
  9. An elastic ring according to Claim 8, wherein the internal crown (5a) has a hole (16) in each side of the slot (15), such holes being intended to receive a tool enabling the ring to be positioned on the base.
  10. An elastic ring according to one of Claims 7 to 9, wherein ring-shaped sector (13) incorporates curved extremities (17).
EP08290009A 2007-01-10 2008-01-07 Elastic retaining ring for retaining combustible casing Not-in-force EP1985965B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0700148A FR2911184B1 (en) 2007-01-10 2007-01-10 ELASTIC RING MAINTAINING A COMBUSTIBLE CASE

Publications (2)

Publication Number Publication Date
EP1985965A1 EP1985965A1 (en) 2008-10-29
EP1985965B1 true EP1985965B1 (en) 2009-12-09

Family

ID=38371079

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08290009A Not-in-force EP1985965B1 (en) 2007-01-10 2008-01-07 Elastic retaining ring for retaining combustible casing

Country Status (6)

Country Link
US (1) US7644662B2 (en)
EP (1) EP1985965B1 (en)
AT (1) ATE451592T1 (en)
DE (1) DE602008000363D1 (en)
ES (1) ES2337851T3 (en)
FR (1) FR2911184B1 (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3776137A (en) * 1971-09-24 1973-12-04 Aai Corp Projectile and cartridge arrangement
US3978793A (en) * 1975-06-30 1976-09-07 The United States Of America As Represented By The Secretary Of The Army Muzzle-expellable cartridge
DE2641665C2 (en) * 1976-09-16 1984-03-01 Rheinmetall GmbH, 4000 Düsseldorf Propellant case
DE2902145A1 (en) * 1979-01-16 1980-08-07 Ultrafin S A CARTRIDGE SLEEVE
DE19944375A1 (en) * 1999-09-16 2001-03-22 Rheinmetall W & M Gmbh Casing base for large-caliber ammunition
FR2799831B1 (en) * 1999-10-13 2001-11-30 Giat Ind Sa DEVICE FOR FIXING A SHUTTERING BASE ON AN AMMUNITION CASE AND BASE SUITABLE FOR SUCH A DEVICE
US6505560B1 (en) 2001-08-07 2003-01-14 Alliant Techsystems Inc. Spring disc for securing a combustible cartridge case to a case base
DE102004062931A1 (en) * 2004-12-22 2006-07-06 Rheinmetall Waffe Munition Gmbh cartridge

Also Published As

Publication number Publication date
US7644662B2 (en) 2010-01-12
ATE451592T1 (en) 2009-12-15
US20080163778A1 (en) 2008-07-10
ES2337851T3 (en) 2010-04-29
FR2911184B1 (en) 2009-04-10
FR2911184A1 (en) 2008-07-11
EP1985965A1 (en) 2008-10-29
DE602008000363D1 (en) 2010-01-21

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