EP2650637B1 - Nonlethal fragmentation grenade comprising means to hold the igniter plug - Google Patents

Nonlethal fragmentation grenade comprising means to hold the igniter plug Download PDF

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Publication number
EP2650637B1
EP2650637B1 EP20130163412 EP13163412A EP2650637B1 EP 2650637 B1 EP2650637 B1 EP 2650637B1 EP 20130163412 EP20130163412 EP 20130163412 EP 13163412 A EP13163412 A EP 13163412A EP 2650637 B1 EP2650637 B1 EP 2650637B1
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EP
European Patent Office
Prior art keywords
grenade
studs
grenade according
discharge tube
moulded
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.)
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Application number
EP20130163412
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German (de)
French (fr)
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EP2650637A3 (en
EP2650637A2 (en
Inventor
Pascal Hupe
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d'Armement et d'Etudes Alsetex Ste
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d'Armement et d'Etudes Alsetex Ste
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Publication of EP2650637A2 publication Critical patent/EP2650637A2/en
Publication of EP2650637A3 publication Critical patent/EP2650637A3/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B8/00—Practice or training ammunition
    • F42B8/12—Projectiles or missiles
    • F42B8/26—Hand grenades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/36—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information
    • F42B12/56—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information for dispensing discrete solid bodies
    • F42B12/58—Cluster or cargo ammunition, i.e. projectiles containing one or more submissiles
    • F42B12/60—Cluster or cargo ammunition, i.e. projectiles containing one or more submissiles the submissiles being ejected radially

Definitions

  • the present invention relates to the field of fragmented grenades with reduced lethality.
  • Low lethal flash grenades are designed not to cause serious injury to persons affected by splinters.
  • Such grenades include shards or projectiles of low kinetic energy.
  • reduced lethal flash grenades comprising a central bursting sheath, at least one ring of studs arranged around the sheath to be propelled during the bursting of the central sheath, and a mechanical holding element are known in particular. studs before bursting of the sheath.
  • the document FR-2741436 describes a grenade comprising means for assembling the studs in the form of elements projecting from the studs and designed to be clipped onto the central bursting sheath, combined with a heat-shrinkable outer sheath.
  • the document FR-2867849 describes a grenade in which the studs are formed of an elastically deformable sheet of projectiles connected by material bridges integrally molded with the projectiles.
  • the document FR-A-2896868 discloses a grenade comprising assembly means in the form of gutter means provided to receive the projectiles preferably combined with an outer shell of heat-shrinkable material.
  • the Applicant has itself proposed a reduced lethal flash grenade characterized in that it comprises a structure consisting of a piece of synthetic material overmolded on at least one crown of studs, in a patent application.
  • the object of the present invention is now to propose an improved variant of grenade with regard to the means described in FIG. FR 58190 .
  • said insert is formed of a generally annular piece comprising a central shaft having means for supporting the spark gap tube and a radially outer flange integral with the outer surface of the barrel and provided with an outgrowth on its outer periphery.
  • the grenade according to the present invention can give rise to several embodiments.
  • the holding structure may be formed of a single piece of synthetic material overmolded on all of the pads, or of several parts overmolded on respective rings and assembled together or more parts overmolded on respective stages of crowns of studs and assembled together.
  • the studs are preferably formed of individual pieces having chamfers or equivalent at each of the connecting zones between each pair of two adjacent axial and transverse to the pomegranate axis, longitudinal and radial with respect to this axis or peripheral radially external or internal and the holding member is formed by filling the volume of these chamfers.
  • the grenade according to the present invention illustrated in the accompanying figures, has a cylindrical outer envelope of revolution centered on an axis O-O.
  • This grenade 10 comprises a spark gap tube 100, at least one ring of studs 200, an overmolded holding structure 300 and an insert 400.
  • the term "overmoulded” must be understood in a broad sense. It includes the realization of the holding element on the ring of pads, by filling the free volume inside a mold or matrix in which said ring of pads is prepositioned, whatever the filling technique, for example any actual molding technique, such as injection molding or material transfer, or material expansion.
  • An initiation device is associated with the spark gap tube 100.
  • the grenade When designed to be used by hand, the grenade is equipped with an igniter cap, as shown on the figure 14 on which the igniter plug is referenced BA.
  • an igniter cap BA is conventional in itself. It will not be described later.
  • igniter plugs, delay plugs and aforementioned delay propulsion devices are well known to those skilled in the art and will therefore not be described in more detail later.
  • the caliber of the grenade may be subject to any suitable variant, the grenade according to the present invention being preferably, but not limited to caliber 56mm or 40mm.
  • These three stages 202, 204 and 206 of pads 200 are arranged in the form of a common ring 280, that is to say that they all have the same internal radius and the same external radius.
  • the grenade according to the present invention may comprise a larger number of stages, for example four stages each comprising several pads, for example six pads 200 equi-distributed around the axis OO and also arranged in the form of a common ring 280.
  • the number of stages of the grenade can be the subject of many variants. It depends in particular on the application of the grenade and its caliber.
  • the grenade according to the present invention comprises, as indicated above, at least one stage of pads. Furthermore, preferably, in the context of the invention, each grenade preferably comprises from three to five stages of pads 200.
  • the number of pads 200 per floor depends on the size of the pads and the caliber of the ammunition.
  • each stage preferably comprises from four to eight pads 200.
  • the grenade according to the present invention may comprise several concentric rings of pads 200 at the same stage, that is to say several crowns of pads disposed on the same axial level of the grenade.
  • the grenade according to the present invention comprises three stages each comprising two concentric rings of studs.
  • the radially inner ring may comprise for example 6 pads 200
  • the radially outer ring may comprise an upper number of pads, for example 12 pads 200.
  • this number of pads per ring, this number of stages and the number of crowns per floor, are not limiting.
  • the pads 200 of the radially inner ring are arranged in the form of a first common ring, while the pads 200 of the radially outer ring are arranged in the form of a second common ring.
  • the spark gap tube 100 is a generally cylindrical piece intended to be placed in the central volume of the grenade and comprising a pyrotechnic charge adapted to ensure the expulsion of the pads 200 during its initiation. More specifically, the expulsion of the pads 200 is performed during the deformation / swelling of the structure 300, under the effect of pressure generated during the operation of the pyrotechnic composition contained in the spark gap tube 100.
  • the initiation of the pyrotechnic charge placed in the spark gap tube is operated, depending on use, by the igniter plug, the delay plug or the delay propulsion device, after transmission by a suitable pyrotechnic delay.
  • Such a spark gap tube is known to those skilled in the art. It will therefore not be described in more detail later as to its structure or composition.
  • the spark gap tube 100 preferably comprises a container tube 102 which is optionally formed of plastic, elastomer or metal, or even another material, for example of cardboard.
  • This tube 102 houses the aforementioned pyrotechnic charge.
  • the spark gap tube 100 may be attached to a central internal chamber of the pomegranate body after overmoulding of the holding structure 300 on all the studs 200 or else integrated into the internal volume of the set of pads 200 before making the holding structure 300 by overmolding.
  • the spark gap tube 100 may be subject to different embodiments.
  • the spark gap tube 100 comprises a tip 104, at an axial end, extended by the aforementioned tube 102.
  • the tip 104 is adapted to be fixed, by its outer surface, to the insert 400.
  • the outer surface of the nozzle 104 advantageously comprises a threading 106 complementary to a tapping 416 provided in the insert 400.
  • the tip 104 is also adapted to receive and support the igniting means.
  • the inner surface of the nozzle 104 preferably comprises a threading complementary to a thread provided on the igniter means.
  • the tube 102 may be staggered, that is to say it may have a section that is variable according to the axial zone of the tube considered. This section is preferably reduced away from the tip 104.
  • the outer surface of the tube 102 is prefragmented in the form of a plurality of longitudinal grooves or grooves, the other 110 peripherals, so that when it burst, the tube 102 is cut into multiple elements presenting each a very small mass.
  • a rupture zone 112 of smaller thickness is preferably provided at the level of the connection zone between the endpiece 104 and the tube 102, for stopping the progression of the fragmentation initiated in the tube 102, towards the tip 104, during operation.
  • the pads 200 are preferably formed of a relatively low density material in order to have, as previously indicated, a low kinetic energy and avoid causing serious injury.
  • the pads 200 are preferably made of plastic or elastomer.
  • each pad is preferably between 7 and 15 grams.
  • the precise mass of each pad 200 can be determined by the nature of the product comprising the pad, in particular charges added to the base material component, and by the geometry of the pad.
  • each pad 200 is preferably between 30 and 90 shores A.
  • Each stud 200 further comprises chamfers or rounded at each junction zone two by two of the aforementioned faces 210, 215, 220, 225, 230 and 235.
  • the axial end faces 230 and 235 may not be flat and parallel to each other. They can be flat but inclined between them. They may also not be planes, but instead have relief shapes, complementary to the adjacent faces of two neighboring studs 200, this for example to perfect the stability of the assembly.
  • the pads of the superposed stages are preferably aligned with each other in the form of columns parallel to the axis O-O.
  • the chamfers 214, 218 adjacent to the radially outer main face 210 and which extend parallel to the axis O-O form longitudinal channels 240.
  • the chamfers 212, 216 adjacent to the radially outer main face 210 which extend transversely to the axis O-O define annular channels 250 transverse to the axis O-O.
  • the aforementioned geometry and the dimension of the pads 200 are such that when they are placed in the mold or complementary matrix for the formation of the holding element 300, the pads 200 are on the one hand , in contact with the cylindrical inner casing of the mold by their radially outer main surface 210 and are, moreover, in contact two by two by their radial main faces 220, 225.
  • the pads are in contact two by two by their axial end faces 230, 235.
  • the studs are firmly immobilized in position in the mold or the matrix, without relative freedom of movement, before making the holding element 300.
  • the radially outer faces 210 of the studs 200 are flush with the outer surface of the grenade after forming the holding element 300.
  • a flange 350 transverse to the axis OO, at least partially closing the central channel for receiving the spark gap tube 100.
  • support inserts in the mold or matrix delimiting the holding member 300, which are used for positioning and axial retention of the pads 200 in the mold or matrix.
  • Such a flange 350 which at least partially covers an axial end of the grenade, reinforces the cohesion of the set of pads 200, especially in case of falling of the grenade body on a rigid surface, before implementation.
  • the overmolded holding structure 300 is made of a material typically chosen from the group of elastomers, such as polyurethane, neoprene or silicone, or from the group of thermoplastic polymers, in particular thermoplastic styrenic and / or vinyl polymers, or thermoplastic polyolefin polymers. such as polyethylene.
  • elastomers such as polyurethane, neoprene or silicone
  • thermoplastic polymers in particular thermoplastic styrenic and / or vinyl polymers, or thermoplastic polyolefin polymers.
  • polyethylene such as polyethylene.
  • the holding structure 300 is made by filling the volumes left free by the abovementioned chamfers formed on the studs 200 and, if appropriate, by an internal volume at the assembly of studs 200, in a mold or matrix defining the external envelope sought for the grenade.
  • the structure of the holding element 300 can be obtained typically by a molding process, in particular by injection molding or material transfer (for example a polyurethane, neoprene, silicone or polyethylene structure ... ), or by expansion of material in a matrix.
  • a molding process in particular by injection molding or material transfer (for example a polyurethane, neoprene, silicone or polyethylene structure ... ), or by expansion of material in a matrix.
  • the holding element 300 comprises a cylindrical external grid 310 which fills the external chamfers of the studs 200.
  • the gate 310 thus comprises parallel rectilinear rails 312 between they and parallel to the axis OO filling the channels 240 and connecting annular cross members 314 which fill the channels 250.
  • the holding element 300 further comprises feet 320 radial to the axis OO, internal to the grid 310 and connected to the grid 310 at the junctions between the longitudinal members 312 and sleepers 314.
  • the feet 320 provide a connection between the outer gate 310 and an inner member 330 formed either of a grid homologous to the outer gate 310 or a sheath.
  • a grenade comprising an internal grid 330, it comprises spars parallel to the axis O-O and transverse cross members transverse to the axis O-O.
  • central element 330 formed of a sleeve, it is formed of a continuous cylindrical skirt centered on the axis O-O.
  • the holding member 300 has a more complex structure and comprises in particularly an intermediate gate structure placed between the ring of rings of pads 200 and connected to the outer gate 310 and to the inner member 330 by feet 320.
  • the studs 200 are ejected radially away from the axis OO under the effect of the pressure and / or the shock wave generated by the deformation ( bursting or swelling) of the structure 300.
  • the structure 300 comprises an external grid 310 which delimits large windows allowing the expulsion of the studs 200 by slight deformation of the component material of the longitudinal members 312 and cross members 314, without impeding the propulsion and the ejection of the pads 200.
  • the grenade according to the present invention also comprises an insert 400.
  • This insert 400 is disposed at an axial end of the overmolded structure 300.
  • the insert 400 is formed of a material adapted to withstand the pressure generated by the pyrotechnic charge, for example high density polyethylene.
  • the purpose of the insert 400 is to avoid swelling of the structure 300 at this axial end, during the implementation of the pyrotechnic charge, which swelling of the structure 300 may risk unexpectedly releasing the igniting means and thus for example to lead to a projection of the igniter cap.
  • the insert 400 comprises, on the one hand, means 410 serving as support for the igniter means and, on the other hand, means 450 for anchoring in the overmolded structure 300.
  • the insert 400 is formed of a generally annular piece, centered on the axis O-O and comprising a central shaft 411 having support means for igniting means, for example the internal tapping 416 above.
  • the support means are adapted to have sufficient mechanical strength to hold the igniter plug in place during operation despite the high pressure generated by the pyrotechnic charge.
  • the insert also comprises a radially outer flange 451 secured to the outer surface of the barrel 411 and provided on its outer periphery with a protrusion 460 serving as anchoring in the structure 300.
  • the protrusion 460 by keeping the overmolded material of the holding element 300 which is situated opposite its radially internal body, prevents swelling of the structure 300.
  • the protrusion 460 preferably has the general shape of a torus centered on the axis O-O.
  • the radial cross section of the protrusion 460 may for example be generally oval with its major axis parallel to the axis O-O.
  • the insert 400 may be provided, at the flange 451 and / or the protrusion 460, a plurality of through passages 470, 480 oriented parallel to the axis OO and allowing ones 470 to form savings passage of the positioning tools of the pads 200 in the mold, and others 480 to form connecting bridges 380 from overmolding, between the two overmolded portions of the element 300 made respectively on either side of the flange 451.
  • the bridges 380 visible on the figure 1 participate in the containment of the holding member 300 avoiding its swelling.
  • the grenade is not limited to an assembly of three stages of studs arranged in the form of a common ring.
  • It may comprise a number of stages and / or concentric rings of upper studs.
  • the pads 200 may be formed of spherical ball.
  • a stack of beads in the form of columns parallel to the axis O-O can be provided, in a manner comparable to the embodiments illustrated in the accompanying figures, a stack of beads in the form of columns parallel to the axis O-O.
  • the balls can be angularly offset by a half diameter, from one stage to the next stage, in order to optimize the number of balls housed in a grenade, with a given axial size.
  • the overmolded structure 300 forms a network of longitudinal members and cross members integral with each other which ensures the cohesion of all the pads 200.
  • the structure may be formed of a single piece 300 of synthetic material overmolded on all the sets of rings of studs 200 juxtaposed axially.
  • the grenade according to the present invention may comprise a holding member 300 formed of several parts overmolded on respective rings and assembled together or several parts overmolded on respective stages of rings of studs and assembled together.
  • the aforementioned parts can be assembled together by the force exerted by an external overmolded part on an internal part, resulting from the constraints after overmolding.
  • the pads 200 being according to the present invention individualized from the outset, as opposed to certain grenades of the prior art comprising a sheet of projectiles connected by bridges of material, the present invention ensures that each projectile individually has a low mass and hence a low kinetic energy.
  • the insert according to the present invention makes it possible to prohibit the ejection of the igniter plug.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Prostheses (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
  • Toys (AREA)

Description

La présente invention concerne le domaine des grenades à éclats à létalité réduite.The present invention relates to the field of fragmented grenades with reduced lethality.

Les grenades à éclats à létalité réduite sont conçues pour ne pas provoquer de blessures sérieuses aux personnes touchées par les éclats.Low lethal flash grenades are designed not to cause serious injury to persons affected by splinters.

De telles grenades comprennent des éclats ou projectiles de faible énergie cinétique.Such grenades include shards or projectiles of low kinetic energy.

Elles sont utilisées généralement à des fins de dissuasion dans le cadre d'opérations de maintien de l'ordre public.They are generally used for deterrence in the context of law enforcement operations.

De nombreuses propositions ont déjà été formulées pour la fabrication de grenades à éclats à létalité réduite.Many proposals have already been made for the production of reduced lethal grenades.

On connaît en particulier, des grenades à éclats à létalité réduite comprenant une gaine centrale d'éclatement, au moins une couronne de plots disposés autour de la gaine pour être propulsés lors de l'éclatement de la gaine centrale, et un élément de maintien mécanique des plots avant éclatement de la gaine.In particular, reduced lethal flash grenades comprising a central bursting sheath, at least one ring of studs arranged around the sheath to be propelled during the bursting of the central sheath, and a mechanical holding element are known in particular. studs before bursting of the sheath.

A titre d'exemple non limitatif, le document FR-2741436 décrit une grenade comprenant des moyens d'assemblage des plots sous forme d'éléments en saillie sur les plots et conçus pour être clipsés sur la gaine centrale d'éclatement, combinés avec une gaine extérieure thermorétractable.By way of non-limiting example, the document FR-2741436 describes a grenade comprising means for assembling the studs in the form of elements projecting from the studs and designed to be clipped onto the central bursting sheath, combined with a heat-shrinkable outer sheath.

Le document FR-2867849 décrit une grenade dans laquelle les plots sont formés d'une nappe élastiquement déformable de projectiles reliés par des ponts de matière venus de moulage avec les projectiles.The document FR-2867849 describes a grenade in which the studs are formed of an elastically deformable sheet of projectiles connected by material bridges integrally molded with the projectiles.

Le document FR-A-2896868 décrit une grenade comprenant des moyens d'assemblage sous la forme de moyens formant gouttière prévus pour recevoir les projectiles combinés de préférence avec une enveloppe extérieure en matériau thermorétractable.The document FR-A-2896868 discloses a grenade comprising assembly means in the form of gutter means provided to receive the projectiles preferably combined with an outer shell of heat-shrinkable material.

La Demanderesse a elle-même proposé une grenade à éclats à létalité réduite caractérisée en ce qu'elle comprend une structure constituée d'une pièce en matériau synthétique surmoulée sur au moins une couronne de plots, dans une demande de brevet FR 10 58190 déposée le 8 octobre 2010 .The Applicant has itself proposed a reduced lethal flash grenade characterized in that it comprises a structure consisting of a piece of synthetic material overmolded on at least one crown of studs, in a patent application. FR 10 58190 filed on October 8, 2010 .

La présente invention a maintenant pour but de proposer une variante de grenade encore perfectionnée vis-à-vis des moyens décrits dans FR 10 58190 .The object of the present invention is now to propose an improved variant of grenade with regard to the means described in FIG. FR 58190 .

Le but précité est atteint dans le cadre de la présente invention, grâce à une grenade à éclats à létalité réduite du type défini en revendication 1 annexée.The above object is achieved within the scope of the present invention, thanks to a reduced lethal grenade of the type defined in appended claim 1.

Selon un mode de réalisation préférentiel, ledit insert est formé d'une pièce globalement annulaire comprenant un fût central comportant des moyens supports du tube éclateur et un flasque radialement externe solidaire de la surface extérieure du fût et muni d'une excroissance sur sa périphérie extérieure.According to a preferred embodiment, said insert is formed of a generally annular piece comprising a central shaft having means for supporting the spark gap tube and a radially outer flange integral with the outer surface of the barrel and provided with an outgrowth on its outer periphery. .

Comme on le précisera par la suite, la grenade conforme à la présente invention peut donner lieu à plusieurs modes de réalisation.As will be specified later, the grenade according to the present invention can give rise to several embodiments.

Elle peut comprendre plusieurs étages de couronnes de plots juxtaposés axialement et/ou plusieurs anneaux de couronnes concentriques de plots au niveau d'un même étage, c'est-à-dire plusieurs couronnes de plots disposées sur un même niveau axial de la grenade, dans ce dernier cas chaque anneau comprenant lui-même de préférence plusieurs étages de couronnes de plots juxtaposés axialement. Dans ce contexte, la structure de maintien peut être formée d'une pièce unique en matériau synthétique surmoulée sur l'ensemble des plots, ou de plusieurs pièces surmoulées sur des anneaux respectifs et assemblées entre elles ou encore de plusieurs pièces surmoulées sur des étages respectifs de couronnes de plots et assemblées entre elles.It may comprise several stages of axially juxtaposed studs and / or several rings of concentric crowns of studs at the same stage, that is to say several crowns of studs arranged on the same axial level of the grenade, in the latter case, each ring preferably itself comprising several stages of juxtaposed stud crowns axially. In this context, the holding structure may be formed of a single piece of synthetic material overmolded on all of the pads, or of several parts overmolded on respective rings and assembled together or more parts overmolded on respective stages of crowns of studs and assembled together.

Les plots sont de préférence formés de pièces individuelles présentant des chanfreins ou équivalents au niveau de chacune des zones de liaison entre chaque paire de deux surfaces adjacentes respectivement axiales et transversales à l'axe de grenade, longitudinales et radiales par rapport à cet axe ou périphériques radialement externe ou interne et l'élément de maintien est formé par remplissage du volume de ces chanfreins.The studs are preferably formed of individual pieces having chamfers or equivalent at each of the connecting zones between each pair of two adjacent axial and transverse to the pomegranate axis, longitudinal and radial with respect to this axis or peripheral radially external or internal and the holding member is formed by filling the volume of these chamfers.

D'autres caractéristiques, buts et avantages de la présente invention apparaîtront à la lecture de la description détaillée qui va suivre et en regard des dessins annexés donnés à titre d'exemples non limitatifs et sur lesquels :

  • la figure 1 représente une vue en coupe axiale d'une grenade conforme à la présente invention selon deux demi-plans de coupe non coplanaires,
  • la figure 2 représente une vue schématique en perspective d'un ensemble de plots susceptibles de former une grenade conforme à la présente invention,
  • la figure 3 représente une vue schématique en perspective complète d'une grenade conforme à la présente invention,
  • la figure 4 représente une vue similaire à la figure 3 selon un angle de vue différent,
  • les figures 5 et 6 représentent une vue schématique en perspective d'une structure de maintien surmoulée conforme à la présente invention, et respectivement le même élément en vue partielle,
  • les figures 7, 8, 9 et 10 représentent respectivement deux vues en perspective, une vue en coupe axiale et une vue en plan d'un insert conforme à la présente invention,
  • les figures 11 et 12 représentent deux vues schématiques en perspective d'un plot individuel conforme à la présente invention,
  • la figure 13 représente une vue en perspective d'un tube éclateur conforme à une variante de la présente invention, et
  • la figure 14 représente schématiquement une vue en coupe axiale d'une grenade complète conforme à la présente invention comprenant un bouchon allumeur formant moyen d'initiation assemblé sur le corps de grenade.
Other features, objects and advantages of the present invention will appear on reading the detailed description which follows and with reference to the appended drawings given by way of non-limiting examples and in which:
  • the figure 1 represents an axial sectional view of a grenade according to the present invention according to two non-coplanar half-section planes,
  • the figure 2 is a schematic perspective view of a set of studs capable of forming a grenade according to the present invention,
  • the figure 3 represents a schematic perspective view of a pomegranate according to the present invention,
  • the figure 4 represents a view similar to the figure 3 according to a different angle of view,
  • the Figures 5 and 6 represent a schematic perspective view of an overmoulded holding structure according to the present invention, and respectively the same element in partial view,
  • the Figures 7, 8 , 9 and 10 represent respectively two perspective views, an axial sectional view and a plan view of an insert according to the present invention,
  • the Figures 11 and 12 represent two schematic perspective views of an individual stud according to the present invention,
  • the figure 13 represents a perspective view of a spark gap tube according to a variant of the present invention, and
  • the figure 14 schematically represents an axial sectional view of a complete grenade according to the present invention comprising an igniter plug forming initiation means assembled on the pomegranate body.

La grenade conforme à la présente invention, illustrée sur les figures annexées, présente une enveloppe externe cylindrique de révolution centrée sur un axe O-O.The grenade according to the present invention, illustrated in the accompanying figures, has a cylindrical outer envelope of revolution centered on an axis O-O.

Cette grenade 10 comprend un tube éclateur 100, au moins une couronne de plots 200, une structure de maintien surmoulée 300 et un insert 400.This grenade 10 comprises a spark gap tube 100, at least one ring of studs 200, an overmolded holding structure 300 and an insert 400.

Dans le cadre de la présente invention, le terme « surmoulé » doit être compris dans un sens large. Il englobe la réalisation de l'élément de maintien sur la couronne de plots, par remplissage du volume libre à l'intérieur d'un moule ou matrice dans lequel ladite couronne de plots est prépositionnée, quelle que soit la technique de remplissage, par exemple toute technique de moulage proprement dite, notamment moulage par injection ou transfert de matière, ou expansion de matière.In the context of the present invention, the term "overmoulded" must be understood in a broad sense. It includes the realization of the holding element on the ring of pads, by filling the free volume inside a mold or matrix in which said ring of pads is prepositioned, whatever the filling technique, for example any actual molding technique, such as injection molding or material transfer, or material expansion.

Un dispositif d'initiation est associé au tube éclateur 100.An initiation device is associated with the spark gap tube 100.

Lorsqu'elle est conçue pour être utilisée à la main, la grenade est équipée d'un bouchon allumeur, comme illustré sur la figure 14 sur laquelle le bouchon allumeur est référencé BA. Un tel bouchon allumeur BA est classique en soi. Il ne sera donc pas décrit par la suite.When designed to be used by hand, the grenade is equipped with an igniter cap, as shown on the figure 14 on which the igniter plug is referenced BA. Such an igniter cap BA is conventional in itself. It will not be described later.

Lorsqu'elle est conçue pour être lancée à l'aide d'un lanceur, elle est équipée d'un bouchon retard ou d'un dispositif dénommé classiquement Dispositif Propulsion Retard, par exemple conforme aux brevets antérieurs FR 2 719 373 et FR 2 863 352 .When it is designed to be launched using a launcher, it is equipped with a late plug or a device conventionally called Device Propulsion Delay, for example in accordance with prior patents FR 2,719,373 and FR 2 863 352 .

Les bouchons allumeurs, bouchons retards et dispositifs de propulsion à retard précités sont bien connus de l'homme de l'art et ne seront donc pas décrits plus en détail par la suite.The igniter plugs, delay plugs and aforementioned delay propulsion devices are well known to those skilled in the art and will therefore not be described in more detail later.

De même, le calibre de la grenade peut faire l'objet de toute variante appropriée, la grenade conforme à la présente invention étant de préférence, mais non limitativement de calibre 56mm ou 40mm.Similarly, the caliber of the grenade may be subject to any suitable variant, the grenade according to the present invention being preferably, but not limited to caliber 56mm or 40mm.

On a représenté sur les figures 1 à 6 annexées, un exemple de réalisation d'une grenade conforme à la présente invention comprenant trois étages 202, 204, 206 de plots 200 comprenant chacun six plots 200 équi-répartis autour de l'axe O-O.We have shown on Figures 1 to 6 attached, an exemplary embodiment of a grenade according to the present invention comprising three stages 202, 204, 206 of pads 200 each comprising six pads 200 equi-distributed around the axis OO.

Ces trois étages 202, 204 et 206 de plots 200 sont disposés sous forme d'un anneau commun 280, c'est-à-dire qu'ils ont tous les trois un même rayon interne et un même rayon externe.These three stages 202, 204 and 206 of pads 200 are arranged in the form of a common ring 280, that is to say that they all have the same internal radius and the same external radius.

En variante, la grenade conforme à la présente invention peut comprendre un nombre plus important d'étages, par exemple quatre étages comprenant chacun plusieurs plots, par exemple six plots 200 équi-répartis autour de l'axe O-O et également disposés sous forme d'un anneau commun 280.As a variant, the grenade according to the present invention may comprise a larger number of stages, for example four stages each comprising several pads, for example six pads 200 equi-distributed around the axis OO and also arranged in the form of a common ring 280.

Le nombre d'étages de la grenade peut faire l'objet de nombreuses variantes de réalisation. Il dépend notamment de l'application de la grenade et de son calibre.The number of stages of the grenade can be the subject of many variants. It depends in particular on the application of the grenade and its caliber.

La grenade conforme à la présente invention comprend, comme indiqué précédemment, au moins un étage de plots. Par ailleurs, de préférence, dans le cadre de l'invention, chaque grenade comprend de préférence de trois à cinq étages de plots 200.The grenade according to the present invention comprises, as indicated above, at least one stage of pads. Furthermore, preferably, in the context of the invention, each grenade preferably comprises from three to five stages of pads 200.

De même, le nombre de plots 200 par étage dépend de la taille des plots et du calibre de la munition.Similarly, the number of pads 200 per floor depends on the size of the pads and the caliber of the ammunition.

Dans le cadre de la présente invention, chaque étage comprend de préférence de quatre à huit plots 200.In the context of the present invention, each stage preferably comprises from four to eight pads 200.

De même en variante, la grenade conforme à la présente invention peut comprendre plusieurs couronnes concentriques de plots 200 au niveau d'un même étage, c'est-à-dire plusieurs couronnes de plots disposées sur un même niveau axial de la grenade.Similarly alternatively, the grenade according to the present invention may comprise several concentric rings of pads 200 at the same stage, that is to say several crowns of pads disposed on the same axial level of the grenade.

Ainsi par exemple selon une variante, la grenade conforme à la présente invention comprend trois étages comprenant chacun deux couronnes concentriques de plots. La couronne radialement interne peut comporter par exemple 6 plots 200, tandis que la couronne radialement externe peut comporter un nombre de plots supérieur, par exemple 12 plots 200. Bien entendu ce nombre de plots par couronne, ce nombre d'étages et le nombre de couronnes par étage, ne sont pas limitatifs. Les plots 200 de la couronne radialement interne sont disposés sous forme d'un premier anneau commun, tandis que les plots 200 de la couronne radialement externe sont disposés sous forme d'un deuxième anneau commun.For example, according to one variant, the grenade according to the present invention comprises three stages each comprising two concentric rings of studs. The radially inner ring may comprise for example 6 pads 200, while the radially outer ring may comprise an upper number of pads, for example 12 pads 200. Of course this number of pads per ring, this number of stages and the number of crowns per floor, are not limiting. The pads 200 of the radially inner ring are arranged in the form of a first common ring, while the pads 200 of the radially outer ring are arranged in the form of a second common ring.

Le tube éclateur 100 est une pièce globalement cylindrique destinée à être placée dans le volume central de la grenade et comprenant une charge pyrotechnique adaptée pour assurer l'expulsion des plots 200 lors de son initiation. Plus précisément, l'expulsion des plots 200 est réalisée lors de la déformation/gonflement de la structure 300, sous l'effet de pression générée lors du fonctionnement de la composition pyrotechnique contenue dans le tube éclateur 100. L'initiation de la charge pyrotechnique placée dans le tube éclateur est opérée, selon l'utilisation, par le bouchon allumeur, le bouchon retard ou le dispositif de propulsion à retard, après transmission par un retard pyrotechnique approprié.The spark gap tube 100 is a generally cylindrical piece intended to be placed in the central volume of the grenade and comprising a pyrotechnic charge adapted to ensure the expulsion of the pads 200 during its initiation. More specifically, the expulsion of the pads 200 is performed during the deformation / swelling of the structure 300, under the effect of pressure generated during the operation of the pyrotechnic composition contained in the spark gap tube 100. The initiation of the pyrotechnic charge placed in the spark gap tube is operated, depending on use, by the igniter plug, the delay plug or the delay propulsion device, after transmission by a suitable pyrotechnic delay.

Un tel tube éclateur est connu en soi de l'homme de l'art. Il ne sera donc pas décrit plus en détail par la suite quant à sa structure ou sa composition.Such a spark gap tube is known to those skilled in the art. It will therefore not be described in more detail later as to its structure or composition.

Le tube éclateur 100 comprend de préférence un tube conteneur 102 qui est formé au choix en matière plastique, en élastomère ou en métal, voire en un autre matériau, par exemple en carton.The spark gap tube 100 preferably comprises a container tube 102 which is optionally formed of plastic, elastomer or metal, or even another material, for example of cardboard.

Ce tube 102 loge la charge pyrotechnique précitée.This tube 102 houses the aforementioned pyrotechnic charge.

Le tube éclateur 100 peut être rapporté dans une chambre interne centrale du corps de grenade après surmoulage de la structure de maintien 300 sur l'ensemble des plots 200 ou encore intégré dans le volume interne de l'ensemble de plots 200 avant réalisation de le structure de maintien 300 par surmoulage.The spark gap tube 100 may be attached to a central internal chamber of the pomegranate body after overmoulding of the holding structure 300 on all the studs 200 or else integrated into the internal volume of the set of pads 200 before making the holding structure 300 by overmolding.

Le tube éclateur 100 peut faire l'objet de différents modes de réalisation.The spark gap tube 100 may be subject to different embodiments.

On a illustré sur la figure 13 une variante de réalisation préférentielle conforme à la présente invention. Selon cette variante, le tube éclateur 100 comprend un embout 104, à une extrémité axiale, prolongé par le tube précité 102. L'embout 104 est adapté pour être fixé, par sa surface extérieure, sur l'insert 400. A cette fin, la surface extérieure de l'embout 104 comprend avantageusement un filetage 106 complémentaire d'un taraudage 416 prévu dans l'insert 400.We illustrated on the figure 13 a preferred embodiment according to the present invention. According to this variant, the spark gap tube 100 comprises a tip 104, at an axial end, extended by the aforementioned tube 102. The tip 104 is adapted to be fixed, by its outer surface, to the insert 400. For this purpose, the outer surface of the nozzle 104 advantageously comprises a threading 106 complementary to a tapping 416 provided in the insert 400.

L'embout 104 est également adapté pour recevoir et supporter les moyens allumeurs. A cette fin, la surface interne de l'embout 104 comporte de préférence un taraudage complémentaire d'un filetage prévu sur les moyens allumeurs.The tip 104 is also adapted to receive and support the igniting means. To this end, the inner surface of the nozzle 104 preferably comprises a threading complementary to a thread provided on the igniter means.

Le tube 102 peut être étagé, c'est-à-dire qu'il peut présenter une section qui est variable selon la zone axiale considérée du tube. Cette section se réduit de préférence en éloignement de l'embout 104.The tube 102 may be staggered, that is to say it may have a section that is variable according to the axial zone of the tube considered. This section is preferably reduced away from the tip 104.

Comme on le voit sur la figure 13, de préférence la surface extérieure du tube 102 est préfragmentée sous forme d'une pluralité de gorges ou rainures les unes 108 longitudinales, les autres 110 périphériques, de sorte que lors de son éclatement, le tube 102 soit découpé en de multiples éléments présentant chacun une masse très réduite.As we see on the figure 13 preferably the outer surface of the tube 102 is prefragmented in the form of a plurality of longitudinal grooves or grooves, the other 110 peripherals, so that when it burst, the tube 102 is cut into multiple elements presenting each a very small mass.

Par ailleurs, il est prévu de préférence au niveau de la zone de liaison entre l'embout 104 et le tube 102, une zone de rupture 112 de plus faible épaisseur, permettant de stopper la progression de la fragmentation initiée dans le tube 102, vers l'embout 104, lors du fonctionnement.Furthermore, it is preferably provided at the level of the connection zone between the endpiece 104 and the tube 102, a rupture zone 112 of smaller thickness, for stopping the progression of the fragmentation initiated in the tube 102, towards the tip 104, during operation.

Les plots 200 sont formés de préférence en un matériau de relativement faible densité afin de présenter, comme indiqué précédemment, une faible énergie cinétique et éviter de provoquer des blessures sérieuses.The pads 200 are preferably formed of a relatively low density material in order to have, as previously indicated, a low kinetic energy and avoid causing serious injury.

Dans le cadre de l'invention, les plots 200 sont réalisés de préférence en matière plastique ou en élastomère.In the context of the invention, the pads 200 are preferably made of plastic or elastomer.

La masse de chaque plot est de préférence comprise entre 7 et 15 grammes. La masse précise de chaque plot 200 peut être déterminée par la nature du produit composant le plot, notamment de charges rajoutées à la matière de base le composant, et par la géométrie du plot.The mass of each pad is preferably between 7 and 15 grams. The precise mass of each pad 200 can be determined by the nature of the product comprising the pad, in particular charges added to the base material component, and by the geometry of the pad.

La dureté de chaque plot 200 est préférentiellement comprise entre 30 et 90 shores A.The hardness of each pad 200 is preferably between 30 and 90 shores A.

Chaque plot 200 a de préférence, comme illustré sur les figures 11 et 12 annexées, la forme générale d'un secteur de couronne possédant des chanfreins au niveau de ses arêtes. Plus précisément encore, dans le cadre de l'invention, chaque plot 200 est de préférence délimité par six faces principales :

  • une face 210 convexe radialement extérieure formée d'un secteur de cylindre de révolution autour de l'axe O-O et une face 215 radialement interne concave formée également d'un secteur de cylindre centré sur l'axe O-O,
  • deux faces planes 220, 225 radiales par rapport à l'axe O-O, formant entre elles un dièdre ; l'angle formé entre les deux faces planes radiales 220, 225 correspondant à l'ouverture angulaire de chaque plot, c'est-à-dire à 360°/n, n représentant le nombre de plots 200 par étage, et
  • deux faces axiales d'extrémité 230, 235 planes parallèles entre elles et perpendiculaires à l'axe O-O ; les deux faces axiales d'extrémité 230, 235 ont par exemple la forme générale de triangles tronqués.
Each pad 200 preferably has, as illustrated on the Figures 11 and 12 attached, the general shape of a crown sector having chamfers at its edges. More specifically, in the context of the invention, each pad 200 is preferably delimited by six main faces:
  • a radially outer convex face 210 formed of a cylinder sector of revolution about the axis OO and a radially inner concave face 215 also formed of a cylinder sector centered on the axis OO,
  • two planar faces 220, 225 radial with respect to the axis OO, forming between them a dihedron; the angle formed between the two radial plane faces 220, 225 corresponding to the angular aperture of each pad, that is to say 360 ° / n, n representing the number of pads 200 per stage, and
  • two axial end faces 230, 235 plane parallel to each other and perpendicular to the axis OO; the two axial end faces 230, 235 have for example the general shape of truncated triangles.

Chaque plot 200 comporte par ailleurs des chanfreins ou arrondis au niveau de chaque zone de jonction deux à deux des faces précitées 210, 215, 220, 225, 230 et 235.Each stud 200 further comprises chamfers or rounded at each junction zone two by two of the aforementioned faces 210, 215, 220, 225, 230 and 235.

Les chanfreins visibles sur les figures 11 et 12 sont référencés 212, 214, 216, 218, 231, 232, 233, 236 et 237.The visible chamfers on the Figures 11 and 12 are referenced 212, 214, 216, 218, 231, 232, 233, 236 and 237.

En variante cependant les faces axiales d'extrémité 230 et 235 peuvent ne pas être planes et parallèles entre elles. Elles peuvent être planes mais inclinées entre elles. Elles peuvent également ne pas être planes, mais comporter au contraire des formes en relief, complémentaires pour les faces adjacentes de deux plots 200 voisins, ceci par exemple afin de parfaire la stabilité de l'ensemble.Alternatively, however, the axial end faces 230 and 235 may not be flat and parallel to each other. They can be flat but inclined between them. They may also not be planes, but instead have relief shapes, complementary to the adjacent faces of two neighboring studs 200, this for example to perfect the stability of the assembly.

Comme on le voit sur les figures annexées, lorsque la grenade comporte plusieurs étages, les plots des étages superposés sont de préférence alignés entre eux sous forme de colonnes parallèles à l'axe O-O.As can be seen in the appended figures, when the grenade comprises several stages, the pads of the superposed stages are preferably aligned with each other in the form of columns parallel to the axis O-O.

Dans cette configuration, les chanfreins 214, 218 adjacents à la face principale radialement externe 210 et qui s'étendent parallèlement à l'axe O-O, forment des canaux longitudinaux 240.In this configuration, the chamfers 214, 218 adjacent to the radially outer main face 210 and which extend parallel to the axis O-O form longitudinal channels 240.

Les chanfreins 212, 216 adjacents à la face principale radialement externe 210 qui s'étendent transversalement à l'axe O-O définissent des canaux annulaires 250 transversaux à l'axe O-O.The chamfers 212, 216 adjacent to the radially outer main face 210 which extend transversely to the axis O-O define annular channels 250 transverse to the axis O-O.

Dans le cadre de la présente invention, la géométrie précitée et la dimension des plots 200 sont telles que lorsqu'ils sont placés dans le moule ou matrice complémentaire pour la formation de l'élément de maintien 300, les plots 200 sont d'une part, en contact avec l'enveloppe interne cylindrique du moule par leur surface principale radialement externe 210 et sont par ailleurs, en contact deux à deux par leurs faces principales radiales 220, 225.In the context of the present invention, the aforementioned geometry and the dimension of the pads 200 are such that when they are placed in the mold or complementary matrix for the formation of the holding element 300, the pads 200 are on the one hand , in contact with the cylindrical inner casing of the mold by their radially outer main surface 210 and are, moreover, in contact two by two by their radial main faces 220, 225.

Par ailleurs, lorsqu'il est prévu plusieurs étages, les plots sont en contact deux à deux par leurs faces axiales d'extrémité 230, 235.Furthermore, when there are several stages, the pads are in contact two by two by their axial end faces 230, 235.

Ainsi, les plots sont fermement immobilisés en position dans le moule ou la matrice, sans liberté de mouvement relatif, avant réalisation de l'élément de maintien 300.Thus, the studs are firmly immobilized in position in the mold or the matrix, without relative freedom of movement, before making the holding element 300.

Compte tenu de ce qui précède, selon les modes de réalisation représentés sur les figures 1, 3 et 4 annexées, les faces radialement externes 210 des plots 200 affleurent la surface extérieure de la grenade après réalisation de l'élément de maintien 300.In view of the above, according to the embodiments shown on the Figures 1, 3 and 4 appended, the radially outer faces 210 of the studs 200 are flush with the outer surface of the grenade after forming the holding element 300.

Il peut en être de même pour les faces axiales d'extrémité 230, 235.It may be the same for the axial end faces 230, 235.

Comme on l'a représenté sur la figure 1, en variante, il peut être prévu à l'extrémité axiale opposée à celle recevant les moyens allumeurs, sur le corps de maintien surmoulé 300, un flasque 350 transversal à l'axe O-O, obturant au moins partiellement le canal central destiné à recevoir le tube éclateur 100.As shown on the figure 1 alternatively, it may be provided at the axial end opposite that receiving the means igniters, on the overmolded holding body 300, a flange 350 transverse to the axis OO, at least partially closing the central channel for receiving the spark gap tube 100.

Dans ce cas, de préférence, il est prévu des inserts supports, dans le moule ou matrice délimitant l'élément de maintien 300, qui servent au positionnement et au maintien axial des plots 200 dans le moule ou matrice.In this case, preferably, there are provided support inserts, in the mold or matrix delimiting the holding member 300, which are used for positioning and axial retention of the pads 200 in the mold or matrix.

Ces inserts ménagent des passages 352 traversant le flasque d'extrémité 350 comme visible sur les figures 1, 3, 5 et 6.These inserts provide passages 352 passing through the end flange 350 as visible on the Figures 1, 3 , 5 and 6 .

Un tel flasque 350 qui recouvre au moins partiellement une extrémité axiale de la grenade, renforce la cohésion de l'ensemble de plots 200, notamment en cas de chute du corps de grenade sur une surface rigide, avant mise en oeuvre.Such a flange 350 which at least partially covers an axial end of the grenade, reinforces the cohesion of the set of pads 200, especially in case of falling of the grenade body on a rigid surface, before implementation.

La structure de maintien surmoulée 300 est réalisée en un matériau choisi typiquement dans le groupe des élastomères, tel que le polyuréthane, le néoprène ou le silicone ou dans le groupe des polymères thermoplastiques en particulier polymères thermoplastiques styréniques et/ou vinyliques, ou polymères thermoplastiques polyoléfines tel que le polyéthylène.The overmolded holding structure 300 is made of a material typically chosen from the group of elastomers, such as polyurethane, neoprene or silicone, or from the group of thermoplastic polymers, in particular thermoplastic styrenic and / or vinyl polymers, or thermoplastic polyolefin polymers. such as polyethylene.

La structure de maintien 300 est réalisée par remplissage des volumes laissés libres par les chanfreins précités formés sur les plots 200 et le cas échéant par un volume interne à l'assemblage de plots 200, dans un moule ou matrice définissant l'enveloppe externe recherchée pour la grenade.The holding structure 300 is made by filling the volumes left free by the abovementioned chamfers formed on the studs 200 and, if appropriate, by an internal volume at the assembly of studs 200, in a mold or matrix defining the external envelope sought for the grenade.

La structure de l'élément de maintien 300 peut être obtenue typiquement par un procédé de moulage, notamment de moulage par injection ou transfert de matière (cas par exemple d'une structure en polyuréthane, en néoprène, en silicone ou en polyéthylène ...), ou par expansion de matière dans une matrice.The structure of the holding element 300 can be obtained typically by a molding process, in particular by injection molding or material transfer (for example a polyurethane, neoprene, silicone or polyethylene structure ... ), or by expansion of material in a matrix.

L'élément de maintien 300 comprend une grille externe cylindrique 310 qui remplit les chanfreins externes des plots 200. La grille 310 comprend ainsi des longerons 312 rectilignes parallèles entre eux et parallèles à l'axe O-O remplissant les canaux 240 et des traverses annulaires de liaison 314 qui remplissent les canaux 250.The holding element 300 comprises a cylindrical external grid 310 which fills the external chamfers of the studs 200. The gate 310 thus comprises parallel rectilinear rails 312 between they and parallel to the axis OO filling the channels 240 and connecting annular cross members 314 which fill the channels 250.

De préférence, l'élément de maintien 300 conforme à la présente invention, comprend en outre des pieds 320 radiaux par rapport à l'axe O-O, internes à la grille 310 et reliés à la grille 310 au niveau des jonctions entre les longerons 312 et les traverses 314.Preferably, the holding element 300 according to the present invention further comprises feet 320 radial to the axis OO, internal to the grid 310 and connected to the grid 310 at the junctions between the longitudinal members 312 and sleepers 314.

Les pieds 320 assurent une liaison entre la grille externe 310 et un élément interne 330 formé, soit d'une grille homologue de la grille externe 310 ou d'un fourreau.The feet 320 provide a connection between the outer gate 310 and an inner member 330 formed either of a grid homologous to the outer gate 310 or a sheath.

Dans le cas d'une grenade comprenant une grille interne 330, celle-ci comprend des longerons parallèles à l'axe O-O et des traverses annulaires transversales à l'axe O-O.In the case of a grenade comprising an internal grid 330, it comprises spars parallel to the axis O-O and transverse cross members transverse to the axis O-O.

Dans le cas d'un élément central 330 formé d'un fourreau, celui-ci est formé d'une jupe cylindrique continue centrée sur l'axe O-O.In the case of a central element 330 formed of a sleeve, it is formed of a continuous cylindrical skirt centered on the axis O-O.

Lorsque la grenade comprend plusieurs anneaux concentriques de couronnes de plots 200 et l'élément de maintien 300 est formé d'une pièce unique surmoulée sur l'ensemble de ces plots 200, l'élément de maintien 300 a une structure plus complexe et comporte en particulier une structure de grille intermédiaire placée entre les anneaux de couronnes de plots 200 et reliée à la grille externe 310 et à l'élément interne 330 par des pieds 320.When the grenade comprises a plurality of concentric rings of stud rings 200 and the holding member 300 is formed of a single piece overmolded on all of these pads 200, the holding member 300 has a more complex structure and comprises in particularly an intermediate gate structure placed between the ring of rings of pads 200 and connected to the outer gate 310 and to the inner member 330 by feet 320.

Lors de l'initiation de la charge pyrotechnique placée dans le tube éclateur 100, les plots 200 sont éjectés radialement en éloignement de l'axe O-O sous l'effet de la pression et/ou de l'onde de choc générée par la déformation (éclatement ou gonflement) de la structure 300.During the initiation of the pyrotechnic charge placed in the spark gap tube 100, the studs 200 are ejected radially away from the axis OO under the effect of the pressure and / or the shock wave generated by the deformation ( bursting or swelling) of the structure 300.

L'homme de l'art comprendra que la structure 300 comprend une grille externe 310 qui délimite de larges fenêtres permettant l'expulsion des plots 200 par légère déformation de la matière composant les longerons 312 et traverses 314, sans gêner la propulsion et l'éjection des plots 200.Those skilled in the art will understand that the structure 300 comprises an external grid 310 which delimits large windows allowing the expulsion of the studs 200 by slight deformation of the component material of the longitudinal members 312 and cross members 314, without impeding the propulsion and the ejection of the pads 200.

Comme on l'a indiqué précédemment, la grenade conforme à la présente invention comprend également un insert 400.As previously indicated, the grenade according to the present invention also comprises an insert 400.

Cet insert 400 est disposé à une extrémité axiale de la structure surmoulée 300.This insert 400 is disposed at an axial end of the overmolded structure 300.

Il est formé en un matériau adapté pour résister à la pression générée par la charge pyrotechnique, par exemple en polyéthylène haute densité. L'insert 400 a pour but d'éviter un gonflement de la structure 300 au niveau de cette extrémité axiale, lors de la mise en oeuvre de la charge pyrotechnique, lequel gonflement de la structure 300 peut risquer de libérer inopinément les moyens allumeurs et ainsi par exemple de conduire à une projection du bouchon allumeur.It is formed of a material adapted to withstand the pressure generated by the pyrotechnic charge, for example high density polyethylene. The purpose of the insert 400 is to avoid swelling of the structure 300 at this axial end, during the implementation of the pyrotechnic charge, which swelling of the structure 300 may risk unexpectedly releasing the igniting means and thus for example to lead to a projection of the igniter cap.

A cette fin, l'insert 400 comprend, d'une part des moyens 410 servant de support aux moyens allumeurs et, d'autre part des moyens 450 d'ancrage dans la structure surmoulée 300.For this purpose, the insert 400 comprises, on the one hand, means 410 serving as support for the igniter means and, on the other hand, means 450 for anchoring in the overmolded structure 300.

Plus précisément encore de préférence, l'insert 400 est formé d'une pièce globalement annulaire, centré sur l'axe O-O et comprenant un fût central 411 comportant des moyens support des moyens allumeurs, par exemple le taraudage interne 416 précité. Les moyens support sont adaptés pour avoir une tenue mécanique suffisante pour maintenir le bouchon allumeur en place lors du fonctionnement malgré la forte pression générée par la charge pyrotechnique.More precisely still preferably, the insert 400 is formed of a generally annular piece, centered on the axis O-O and comprising a central shaft 411 having support means for igniting means, for example the internal tapping 416 above. The support means are adapted to have sufficient mechanical strength to hold the igniter plug in place during operation despite the high pressure generated by the pyrotechnic charge.

L'insert comprend également un flasque 451 radialement externe solidaire de la surface extérieure du fût 411 et muni sur sa périphérie externe d'une excroissance 460 servant d'ancrage dans la structure 300.The insert also comprises a radially outer flange 451 secured to the outer surface of the barrel 411 and provided on its outer periphery with a protrusion 460 serving as anchoring in the structure 300.

L'homme de l'art comprendra en effet que l'excroissance 460, en maintenant la matière surmoulée de l'élément de maintien 300 qui est située en regard de sa dépouille radialement interne, interdit un gonflement de la structure 300.Those skilled in the art will in fact understand that the protrusion 460, by keeping the overmolded material of the holding element 300 which is situated opposite its radially internal body, prevents swelling of the structure 300.

L'excroissance 460 a de préférence la forme générale d'un tore centré sur l'axe O-O. La section droite radiale de l'excroissance 460 peut être par exemple globalement ovale avec son grand axe parallèle à l'axe O-O.The protrusion 460 preferably has the general shape of a torus centered on the axis O-O. The radial cross section of the protrusion 460 may for example be generally oval with its major axis parallel to the axis O-O.

L'insert 400 peut être pourvu, au niveau du flasque 451 et/ou de l'excroissance 460, d'une pluralité de passages traversants 470, 480 orientés parallèlement à l'axe O-O et permettant les uns 470 de former des épargnes de passage des outillages de positionnement des plots 200 dans le moule, et les autres 480 de former des ponts de liaison 380 venus du surmoulage, entre les deux portions surmoulées de l'élément 300 réalisées respectivement de part et d'autre du flasque 451. Les ponts 380 visibles sur la figure 1 participent au confinement de l'élément de maintien 300 en évitant son gonflement.The insert 400 may be provided, at the flange 451 and / or the protrusion 460, a plurality of through passages 470, 480 oriented parallel to the axis OO and allowing ones 470 to form savings passage of the positioning tools of the pads 200 in the mold, and others 480 to form connecting bridges 380 from overmolding, between the two overmolded portions of the element 300 made respectively on either side of the flange 451. The bridges 380 visible on the figure 1 participate in the containment of the holding member 300 avoiding its swelling.

On aperçoit sur les figures 7 à 10 annexées un exemple non limitatif de réalisation selon lequel il est ainsi prévu 6 passages 480 traversants pour la réalisation des ponts 380 et 6 passages 470 pour les outillages de positionnement.We can see on Figures 7 to 10 appended a non-limiting embodiment of embodiment according to which there is thus provided 6 through passages 480 for the realization of bridges 380 and 6 passages 470 for positioning tools.

Bien entendu la présente invention n'est pas limitée aux modes de réalisation qui viennent d'être décrits, mais s'étend à toute variante conforme à son esprit.Of course, the present invention is not limited to the embodiments that have just been described, but extends to any variant within its spirit.

En particulier, comme évoqué précédemment, la grenade n'est pas limitée à un assemblage de trois étages de plots disposés sous forme d'un anneau commun.In particular, as mentioned above, the grenade is not limited to an assembly of three stages of studs arranged in the form of a common ring.

Elle peut comprendre un nombre d'étages et/ou d'anneaux concentriques de plots supérieur.It may comprise a number of stages and / or concentric rings of upper studs.

Selon une autre variante de la grenade conforme à la repésente invention, les plots 200 peuvent être formés de bille sphérique.According to another variant of the grenade according to the invention, the pads 200 may be formed of spherical ball.

En effet, l'on peut prévoir, de manière comparable aux modes de réalisation illustrés sur les figures annexées, un empilement des billes sous formes de colonnes parallèles à l'axe O-O. Les billes peuvent être décalées angulairement d'un demi diamètre, d'un étage à l'étage suivant, afin d'optimiser le nombre de billes logées dans une grenade, à encombrement axial donné.Indeed, one can provide, in a manner comparable to the embodiments illustrated in the accompanying figures, a stack of beads in the form of columns parallel to the axis O-O. The balls can be angularly offset by a half diameter, from one stage to the next stage, in order to optimize the number of balls housed in a grenade, with a given axial size.

Que les billes soient empilées en colonnes régulières ou décalées d'un étage à l'autre, la structure surmoulée 300 forme un réseau de longerons et traverses solidaires entre eux qui assure la cohésion de l'ensemble des plots 200.Whether the beads are stacked in regular columns or shifted from one stage to another, the overmolded structure 300 forms a network of longitudinal members and cross members integral with each other which ensures the cohesion of all the pads 200.

La structure peut être formée d'une pièce unique 300 en matériau synthétique surmoulée sur l'ensemble des étages de couronnes de plots 200 juxtaposés axialement.The structure may be formed of a single piece 300 of synthetic material overmolded on all the sets of rings of studs 200 juxtaposed axially.

En variante la grenade conforme à la présente invention peut comprendre un élément de maintien 300 formé de plusieurs pièces surmoulées sur des anneaux respectifs et assemblées entre elles ou encore de plusieurs pièces surmoulées sur des étages respectifs de couronnes de plots et assemblées entre elles.Alternatively the grenade according to the present invention may comprise a holding member 300 formed of several parts overmolded on respective rings and assembled together or several parts overmolded on respective stages of rings of studs and assembled together.

Les pièces précitées peuvent être assemblées entre elles grâce à l'effort exercé par une pièce surmoulée externe sur une pièce interne, résultant des contraintes après surmoulage.The aforementioned parts can be assembled together by the force exerted by an external overmolded part on an internal part, resulting from the constraints after overmolding.

L'homme de l'art comprendra que les plots 200 étant selon la présente invention individualisés dès l'origine, par opposition à certaines grenades de l'art antérieur comprenant une nappe de projectiles reliés par des ponts de matière, la présente invention garantit que chaque projectile présente individuellement une faible masse et de là un faible énergie cinétique.Those skilled in the art will understand that the pads 200 being according to the present invention individualized from the outset, as opposed to certain grenades of the prior art comprising a sheet of projectiles connected by bridges of material, the present invention ensures that each projectile individually has a low mass and hence a low kinetic energy.

L'homme de l'art comprendra également que l'insert conforme à la présente invention permet d'interdire l'éjection du bouchon allumeur.Those skilled in the art will also understand that the insert according to the present invention makes it possible to prohibit the ejection of the igniter plug.

Claims (16)

  1. Non-lethal fragmentation grenade comprising:
    - a discharge tube (100) intended to be associated with firing means,
    - at least one ring (202, 204, 206) of studs (200) arranged about the discharge tube (100)
    - a structure (300) for mechanically holding the studs (200) prior to the operation of the discharge tube (100), such that the studs are propelled following a deformation or inflation of the structure (300) under the effect of the operation of a pyrotechnic composition contained in the discharge tube (100),
    the holding structure comprising a part made of synthetic material moulded on at least one ring of studs (200), characterised in that the device further comprises an insert (400) arranged in the vicinity of one axial end of the moulded structure (300) and comprising, on one hand, means (416) for supporting the discharge tube (100) and, on the other, means (450) for securing in the structure (300), characterised in that the securing means comprise at least one protuberance (460) defining a radially internal draught holding the moulded material of the part comprising the holding structure so as to prevent expansion of the structure at said insert (400) during the operation of the pyrotechnic composition.
  2. Grenade according to claim 1, characterised in that the insert (400) consists of a substantially annular part comprising a central shaft (410) comprising means (416) for supporting the discharge tube (100) and a radially external flange (451) rigidly connected to the external surface of the shaft (410) and provided with a protuberance (460) on the external periphery thereof.
  3. Grenade according to claim 2, characterised in that the protuberance (460) is preferably in the shape of a torus centred on the axis of the grenade.
  4. Grenade according to claim 3, characterised in that the protuberance (460) has a substantially oval radial cross-section wherein the greater axis thereof is parallel with the axis of the grenade.
  5. Grenade according to any of claims 2 to 4, characterised in that the means for supporting the discharge tube comprise an internal thread (416) in the central shaft (410).
  6. Grenade according to any of claims 1 to 5, characterised in that the insert (400) comprises through passages (480) forming moulded connection bridges (380) between the two moulded portions of the element (300) produced on either side of the flange (451), respectively.
  7. Grenade according to any of claims 1 to 6, characterised in that the insert (400) comprises through passages forming reserves for inserting tools for positioning the studs (200).
  8. Grenade according to any of claims 1 to 7, characterised in that the insert (400) is made of high-density polyethylene.
  9. Grenade according to any of claims 1 to 8, characterised in that discharge tube (100) comprises a pre-fragmented body (102).
  10. Grenade according to claim 9, characterised in that the pre-fragmented body (102) comprises a plurality of longitudinal grooves (108) and peripheral grooves (110) such that, following the discharge thereof, the body (102) is split into multiple elements having a low weight.
  11. Grenade according to any of claims 9 or 10, characterised in that the discharge tube (100) comprises an end fitting (104) suitable for supporting the firing means and a pre-fragmented tubular body (102), a rupture area (112) being provided at the connection area between the end fitting (104) and the tubular body (102).
  12. Grenade according to any of claims 1 to 11, characterised in that the studs consist of individual parts having bevels or equivalent at each of the connection areas between each pair of two adjacent surfaces which are respectively axial and transversal with respect to the grenade axis (230, 235), longitudinal and radial in relation to this axis (220, 225), or externally or internally radially peripheral (210, 215) and the holding structure (300) is formed by filling the volume of these bevels.
  13. Grenade according to any of claims 1 to 12, characterised in that the holding structure (300) comprises an external grid comprising rectilinear longitudinal members (312) and annular transverse members (314) defining an external grid having a cylindrical general outline, and an internal element (330) connected to the external cylindrical grid (310) by a plurality of radial bases (320).
  14. Grenade according to any of claims 1 to 13, characterised in that each stud consists of a ring sector defined by 6 main faces: one radially external face in the form of a cylinder sector (210) and one radially internal face (215) in the form of a cylinder sector, two mutually inclined plane radial faces (220, 225) and two axial end faces (230, 235), at least some of the joining areas of the abovementioned faces being bevelled.
  15. Grenade according to any of claims 1 to 14, characterised in that it comprises a plurality of axially juxtaposed stud ring stages and/or a plurality of concentric stud ring areas on the same stage.
  16. Grenade according to any of claims 1 to 15, characterised in that the holding element is formed from a single part made of synthetic material moulded on all the studs or from a plurality of parts moulded on the respective rings and assembled together or a plurality of parts moulded on respective stud ring stages and assembled together.
EP20130163412 2012-04-12 2013-04-11 Nonlethal fragmentation grenade comprising means to hold the igniter plug Active EP2650637B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1253349A FR2989457B1 (en) 2012-04-12 2012-04-12 NON-LETHAL FLAKE GRENADE COMPRISING MEANS FOR MAINTAINING IGNITION PLUG

Publications (3)

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EP2650637A2 EP2650637A2 (en) 2013-10-16
EP2650637A3 EP2650637A3 (en) 2013-10-30
EP2650637B1 true EP2650637B1 (en) 2014-11-12

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EP (1) EP2650637B1 (en)
ES (1) ES2529657T3 (en)
FR (1) FR2989457B1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US10030955B1 (en) * 2016-09-30 2018-07-24 The United States Of America As Represented By The Secretary Of The Army Multi-purpose non-lethal blunt trauma grenade

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Publication number Priority date Publication date Assignee Title
CN105987648A (en) * 2015-02-05 2016-10-05 郭三学 Cluster bomb type hand stun grenade
US11796281B1 (en) * 2022-06-24 2023-10-24 Acetk Corp Ltd. Multi-tube grenade for a toy launcher

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FR1058190A (en) 1951-06-11 1954-03-15 Nordisk Aluminium Ind As Method and machine for joining metal strips
FR1134371A (en) * 1954-05-04 1957-04-10 Betts & Co Ltd Containers and process for their manufacture
FR2719373B1 (en) 1994-05-02 1996-07-19 Sae Alsetex Propulsion device with variable ranges for riot grenade.
FR2741436B1 (en) 1995-11-16 1998-01-30 Applic Des Procedes Lefebvre S FRAGMENTABLE GRENADE IN LOW CINETIC ENERGY PROJECTILES
FR2863352B1 (en) 2003-12-03 2006-03-24 Armement Et D Etudes Alsetex S DEVICE FOR PROPULSION OF A GRENADE ANTI-EMEUTES
FR2867849B1 (en) 2004-03-16 2006-07-21 Catherine Tanguy FRAGMENTABLE GRENAGE
FR2896868B1 (en) 2006-01-30 2010-07-30 Soc D Application Des Procedes Lefebvre FRAGMENTABLE GRENADE IN PROJECTILES OF LOW KINETIC ENERGY.
FR2923004B1 (en) * 2007-10-26 2009-12-04 Applic Des Procedes Lefebvre S FRAGMENTABLE GRENADE IN PROJECTILES OF LOW KINETIC ENERGY.
FR2965910B1 (en) * 2010-10-08 2012-11-02 Armement Et D Etudes Alsetex Soc D NON-LETHAL GRENADE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10030955B1 (en) * 2016-09-30 2018-07-24 The United States Of America As Represented By The Secretary Of The Army Multi-purpose non-lethal blunt trauma grenade

Also Published As

Publication number Publication date
FR2989457A1 (en) 2013-10-18
EP2650637A3 (en) 2013-10-30
FR2989457B1 (en) 2017-03-17
ES2529657T3 (en) 2015-02-24
EP2650637A2 (en) 2013-10-16

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