EP2665984A1 - Protective screen - Google Patents

Protective screen

Info

Publication number
EP2665984A1
EP2665984A1 EP12709895.2A EP12709895A EP2665984A1 EP 2665984 A1 EP2665984 A1 EP 2665984A1 EP 12709895 A EP12709895 A EP 12709895A EP 2665984 A1 EP2665984 A1 EP 2665984A1
Authority
EP
European Patent Office
Prior art keywords
grid
bars
rocket
thickness
uprights
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.)
Granted
Application number
EP12709895.2A
Other languages
German (de)
French (fr)
Other versions
EP2665984B1 (en
Inventor
Daniel Vallee
Didier Mallat
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nexter Systems SA
Original Assignee
Nexter Systems SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nexter Systems SA filed Critical Nexter Systems SA
Publication of EP2665984A1 publication Critical patent/EP2665984A1/en
Application granted granted Critical
Publication of EP2665984B1 publication Critical patent/EP2665984B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/02—Plate construction
    • F41H5/023—Armour plate, or auxiliary armour plate mounted at a distance of the main armour plate, having cavities at its outer impact surface, or holes, for deflecting the projectile
    • F41H5/026—Slat armour; Nets

Abstract

The invention relates to protection grid against a projectile, for example of the rocket type that incorporates a body extended by a fuse, said grid incorporating bars linked together by uprights, and is characterized in that said grid is formed in a single piece and is of a thickness that is three times less than the thickness of a bar, the section of a bar and uprights being polygonal with square edges.

Description

GRILLE DE PROTECTION  PROTECTION GRID
Le domaine technique de l'invention est celui des dispositifs de protection balistique contre les projectiles et en particulier les roquettes. The technical field of the invention is that of ballistic protection devices against projectiles and in particular rockets.
La protection des véhicules militaires contre les attaques de roquettes, en particulier à charge creuse, est actuellement confiée pour tout ou partie à des dispositifs de grilles ou de grillages plans couramment dénommés "slat".  The protection of military vehicles against rocket attacks, in particular with hollow charge, is currently entrusted for all or part of devices grids or flat grids commonly referred to as "slat".
Ces dispositifs ont pour principe de fonctionnement commun d'endommager l'ogive d'une roquette afin de créer un court-circuit dans le système de mise à feu de la charge militaire du projectile. Pour cela ils comprennent le plus souvent des lames métalliques parallèles d'une largeur comprise entre 30 et 40 mm pour une épaisseur comprise entre 2 et 5 mm.  These devices have the common operating principle of damaging the warhead of a rocket to create a short circuit in the firing system of the military load of the projectile. For this they most often comprise parallel metal blades with a width of between 30 and 40 mm for a thickness of between 2 and 5 mm.
Comme décrit dans le brevet FR-1103549, ces lames endommagent l'ogive qui les impacte. Le cas défavorable déclenchant la mise à feu de la roquette ne se produit que lorsque la fusée piézoélectrique de la roquette heurte directement une lame ou une portion de la structure du dispositif de protection. Pour remédier à cela la surface opposée par la tranche des lames est aussi réduite que possible afin de limiter statistiquement la probabilité que la fusée heurte cette tranche.  As described in patent FR-1103549, these blades damage the warhead that impacts them. The adverse case triggering the firing of the rocket occurs only when the piezo rocket rocket directly hits a blade or a portion of the structure of the protective device. To remedy this, the opposite surface of the slice of the slats is as small as possible in order to statistically limit the probability that the slab will strike this slice.
Cette solution fonctionne pour le cas d'une attaque frontale ou sensiblement perpendiculaire au plan du dispositif de protection. En revanche, plus l'angle de tir en site entre le plan du dispositif et la trajectoire du projectile est faible, plus la surface opposée par un dispositif à lames est importante, ce qui augmente la probabilité de voir la fusée de la roquette heurter une lame.  This solution works for the case of a frontal attack or substantially perpendicular to the plane of the protection device. However, the lower the firing angle between the plane of the device and the trajectory of the projectile, the greater the surface opposed by a blade device, which increases the probability of the rocket rocket hitting a blade.
On connaît aussi par le brevet US2009266227 un dispositif de protection dans lequel des inserts durs en acier ou tungstène sont positionnés en réseau sur un ensemble de câbles minces formant un filet. Les inserts ont pour but de détériorer l'ogive ou la fusée du projectile pour le neutraliser .  Also known from US2009266227 a protective device in which hard inserts of steel or tungsten are positioned in a network on a set of thin cables forming a net. The inserts are intended to damage the warhead or projectile rocket to neutralize it.
Dans une telle solution, légère mais de structure complexe, il est nécessaire que les câbles soient assez souples pour que le projectile soit amené en contact avec un des insexts durs. In such a solution, light but complex structure, it is necessary that the cables are enough flexible so that the projectile is brought into contact with one of the hard insexts.
Par ailleurs la présence d'un cadre périphérique pour le maintien du filet réduit fortement l'efficacité de la protection lorsque l'angle entre le plan de l'écran et la trajectoire d'impact est faible.  Moreover, the presence of a peripheral frame for maintaining the net greatly reduces the effectiveness of the protection when the angle between the plane of the screen and the impact path is low.
On connaît également le brevet GB2448477 qui décrit une grille allégée assurant la protection balistique contre les roquettes. Cette grille comporte des barreaux plats en fibre de carbone fixés à des montants en alliage léger. Cette grille neutralise elle aussi les roquettes en détériorant leur ogive ou leur fusée.  Patent GB 2448477 is also known which describes a lightened grid providing ballistic protection against rockets. This grid comprises carbon fiber flat bars fixed to light alloy uprights. This grid also neutralizes the rockets by deteriorating their warhead or their rocket.
Une telle solution, bien que légère, est de structure complexe, et elle ne protège que contre des roquettes tirées sensiblement perpendiculairement à la grille.  Such a solution, although light, is of complex structure, and it protects only against rockets fired substantially perpendicular to the grid.
On connaît aussi par les brevets WO2010/036411 et US5007326 des plaques de blindage perforées assurant une protection contre les projectiles de petit calibre. Ces plaques portent des trous de diamètre réduit (de l'ordre de 12,5 mm) et ne peuvent donc détériorer les ogives des roquettes pour les neutraliser. Sur de telles plaques de blindage, la roquette se trouve systématiquement initiée.  Also known from patents WO2010 / 036411 and US5007326 perforated shielding plates providing protection against small caliber projectiles. These plates have holes of reduced diameter (of the order of 12.5 mm) and therefore can not damage the warheads of the rockets to neutralize them. On such armor plates, the rocket is systematically initiated.
Le brevet US7191694 propose un dispositif de protection des rebords de vitrages de véhicules blindés. Là encore une telle protection comporte des perçages oblongs de dimensions réduites (5 mm de large environ) et ne peut assurer la neutralisation d'une roquette.  US Pat. No. 7,191,994 proposes a device for protecting the edges of windows of armored vehicles. Again such protection has oblong holes of reduced dimensions (about 5 mm wide) and can not ensure the neutralization of a rocket.
Le brevet EP1574810 enfin décrit un blindage multicouche dont la plaque externe porte des perçages permettant d'apporter une protection contre les projectiles de petit calibre (inférieur à 20mm) . Cette plaque ne peut pas non plus assurer la neutralisation d'une roquette incidente.  Patent EP1574810 finally describes a multilayer shield whose outer plate bears holes to provide protection against small projectiles (less than 20mm). This plate can not ensure the neutralization of an incidental rocket.
L'invention propose de pallier de tels inconvénients en mettant en œuvre une grille, rigide mais de faible épaisseur, et comportant des barreaux réalisés en un matériau dur, par exemple métallique, et présentant des angles vifs. Les barreaux sont reliés par des montants. L'invention permet ainsi d'assurer une protection contre des roquettes tirées selon différents angles d'incidence par rapport au plan de la grille. The invention proposes to overcome such disadvantages by implementing a grid, rigid but thin, and having bars made of a hard material, for example metallic, and having sharp angles. The bars are connected by uprights. The invention thus provides protection against rockets fired at different angles of incidence relative to the plane of the grid.
La grille selon l'invention présente comme avantage d'opposer une faible surface aux angles d'attaque en site faibles tout en étant suffisamment agressive pour endommager l'ogive d'une roquette.  The grid according to the invention has the advantage of opposing a small surface area to low angles of attack while being sufficiently aggressive to damage the warhead of a rocket.
Un second avantage est son faible encombrement qui la rend légère, facilement manutentionnable et stockable.  A second advantage is its small footprint which makes it light, easy to handle and storable.
Un troisième avantage réside dans le fait que la grille peut être fabriquée d'un seul tenant, de façon monobloc, par découpe laser ou par matriçage par exemple dans une plaque d'acier. On simplifie ainsi la fabrication de la grille.  A third advantage lies in the fact that the grid can be manufactured in one piece, in one piece, by laser cutting or stamping for example in a steel plate. This simplifies the manufacture of the grid.
Un quatrième avantage lié à ce mode de fabrication monobloc, est que la grille est moins soumise aux ruptures entre montants et barreaux car elle ne présente pas de discontinuité de matière à ce niveau.  A fourth advantage related to this one-piece manufacturing method, is that the grid is less subject to breaks between uprights and bars because it does not have material discontinuity at this level.
Un cinquième avantage réside dans la répartition en alternance des montants ce qui permet d'en limiter le nombre, de réduire la probabilité que la fusée heurte un montant et permet de rendre la grille autoporteuse (pas besoin de cadre comme pour un dispositif à câbles) .  A fifth advantage lies in the alternating distribution of the amounts which allows to limit the number, to reduce the probability that the rocket hits an amount and makes the self-supporting grid (no need for a frame as for a cable device) .
Ainsi, l'invention a pour objet une grille de protection contre un projectile, par exemple de type roquette comprenant un corps prolongé par une fusée, grille comportant des barreaux reliés par des montants, la largeur entre les barreaux étant comprise entre le diamètre maximal de la fusée et le diamètre maximal du corps du projectile, grille de protection caractérisée en ce que la grille est monobloc et a une épaisseur qui est inférieure à trois fois l'épaisseur d'un barreau, la section des barreaux et des montants étant polygonale à angles vifs.  Thus, the subject of the invention is a protective grid against a projectile, for example of the rocket type comprising a body extended by a rocket, a grid comprising bars connected by uprights, the width between the bars being between the maximum diameter of the rocket and the maximum diameter of the body of the projectile, protective grid characterized in that the grid is monobloc and has a thickness which is less than three times the thickness of a bar, the section of the bars and uprights being polygonal to sharp angles.
Selon une caractéristique de l'invention, l'épaisseur de la grille est inférieure à 15 mm.  According to one characteristic of the invention, the thickness of the gate is less than 15 mm.
Avantageusement, la dureté du matériau qui constitue la grille est supérieure à 350 HRB. Avantageusement, les montants sont répartis en alternance, d'une rangée de barreaux à l'autre, sur l'ensemble de la grille. Advantageously, the hardness of the material constituting the grid is greater than 350 HRB. Advantageously, the amounts are distributed alternately, from one row of bars to the other, on the entire grid.
Selon un mode de réalisation de l'invention, la grille est plane.  According to one embodiment of the invention, the grid is flat.
Avantageusement, l'épaisseur de la grille est constante. Advantageously, the thickness of the grid is constant.
Selon une autre caractéristique de l'invention, la grille pourra comporter au moins une zone de fixation plane comportant elle-même au moins un perçage. According to another characteristic of the invention, the grid may comprise at least one planar fixing zone including itself at least one piercing.
L'invention sera mieux comprise à la lecture de la description suivante, description illustrée par les dessins annexés dans lesquels:  The invention will be better understood on reading the following description, a description illustrated by the appended drawings in which:
- la figure 1 représente la grille selon l'invention en vue de face,  FIG. 1 represents the grid according to the invention in front view,
- la figure 2 représente une vue partielle de la grille en coupe suivant le plan A-A repéré à la figure 1, et  FIG. 2 represents a partial view of the grid in section along the plane A-A identified in FIG. 1, and
la figure 3 présente une vue de trois quarts d'un empilage de grilles selon un second mode de réalisation de 1 ' invention .  Figure 3 shows a three-quarter view of a stack of grids according to a second embodiment of the invention.
Selon la figure 1, une grille 1 selon un premier mode de réalisation de l'invention comporte des barreaux 2 horizontaux parallèles entre eux. Ces barreaux 2 sont reliés entre eux par des montants 3. Les montants 3 sont ici également présents à chacune des extrémités des barreaux 2.  According to Figure 1, a grid 1 according to a first embodiment of the invention comprises horizontal bars 2 parallel to each other. These bars 2 are interconnected by amounts 3. The amounts 3 are here also present at each end of the bars 2.
La largeur L entre barreaux est comprise entre le diamètre maximal d'une fusée d'un projectile (non représenté, par exemple une roquette) et le diamètre maximal du corps de ce projectile. Ces dimensions sont bien connues de l'homme du métier notamment par l'enseignement du brevet US200926227 (cité comme art antérieur) et qui précise que les dimensions de la maille d'un filet pouvant arrêter une roquette sont comprises entre 110 et 180 mm et que la protection doit être placée à une distance d'environ 60 cm de la structure à protéger.  The width L between bars is between the maximum diameter of a rocket of a projectile (not shown, for example a rocket) and the maximum diameter of the body of this projectile. These dimensions are well known to those skilled in the art including the teaching of US200926227 (cited as a prior art) and which specifies that the size of the mesh of a net that can stop a rocket are between 110 and 180 mm and the protection must be placed at a distance of approximately 60 cm from the structure to be protected.
Une telle disposition de grille qui est bien connue a pour but d'assurer le passage des fusées de ces projectiles entre les barreaux tandis que le corps lui même du projectile est arrêté par la grille. Il en résulte un choc important au niveau de la partie ogivée du projectile reliant la fusée et le corps, ce qui conduit à la destruction du moyen d'amorçage. Le projectile n'est donc pas initié et se trouve neutralisé . Such a grid arrangement which is well known aims to ensure the passage of the rockets of these projectiles between the bars while the body itself of the projectile is stopped by the grid. This results in a significant shock to level of the ogive portion of the projectile connecting the rocket and the body, which leads to the destruction of the priming means. The projectile is not initiated and is neutralized.
Les montants 3 sont répartis en alternance d'une rangée de barreaux à l'autre, sur la surface de la grille 1. De cette manière, il est possible de mettre moins de montants 3 que s'ils étaient alignés d'une rangée de barreaux à l'autre.  The amounts 3 are alternately distributed from one row of bars to the other, on the surface of the grid 1. In this way, it is possible to put fewer amounts 3 than if they were aligned with a row of bars to the next.
La grille 1 est monobloc, c'est dire qu'elle est réalisée d'un seul tenant, par exemple par découpe laser ou à la presse, dans une plaque d'acier d'épaisseur constante. Il est envisageable de réaliser la grille par soudure ou assemblage mécanique des montants 3 et des barreaux 2 entre eux. La fabrication par découpe est plus simple car elle limite le nombre d'opérations de fabrication et surtout elle procure une solidité accrue de la grille 1 qui va ainsi voir le nombre de ses points faibles, situés aux intersections entre barreaux 2 et montants 3, diminué.  The grid 1 is monobloc, that is to say that it is made in one piece, for example by laser cutting or press, in a steel plate of constant thickness. It is conceivable to make the grid by welding or mechanical assembly of the uprights 3 and bars 2 between them. The manufacture by cutting is simpler because it limits the number of manufacturing operations and especially it provides an increased strength of the grid 1 which will thus see the number of its weak points, located at intersections between bars 2 and 3 amounts, decreased .
Selon la figure 2 la grille 1 est plane et ne présente pas de surépaisseurs localisées. Les barreaux 2 présentent une section polygonale à angles vifs sensiblement rectangulaire. L'épaisseur 4 de la grille 1 est inférieure à trois fois l'épaisseur 5 d'un barreau 2. Les montants 3 ont également une épaisseur égale à celle des barreaux. L'épaisseur 4 de la grille est de préférence inférieure à 15mm.  According to Figure 2 the grid 1 is flat and does not have localized thicknesses. The bars 2 have a polygonal section with sharp angles substantially rectangular. The thickness 4 of the grid 1 is less than three times the thickness of a bar 2. The uprights 3 also have a thickness equal to that of the bars. The thickness 4 of the grid is preferably less than 15 mm.
La grille 1 comporte des zones de fixation planes 10 (figure 1) comportant elles même un perçage 11 destiné à 1 ' interfaçage de la grille 1 avec des' éléments de support solidaires du véhicule (éléments de support et véhicule non représentés). Ces zones seront, elles aussi, réalisées aisément par découpe. The grid 1 has planar attachment zones 10 (Figure 1) comprising they even a bore 11 for 1 interfacing the grid 1 with support members secured to the vehicle (support members and not shown vehicle). These areas will also be easily cut.
La grille 1 est réalisée dans un matériau présentant une dureté superficielle supérieure à 350 HRB (symbole désignant conventionnellement la dureté Rockwell B, qui est définie par la norme ISO 6508-1) . Les barreaux 2 ainsi obtenus présentent des arêtes vives aptes à pénétrer le corps du projectile au niveau de l'ogive et pour tous les angles de tir. The grid 1 is made of a material having a surface hardness greater than 350 HRB (symbol conventionally denoting the Rockwell B hardness, which is defined by the ISO 6508-1 standard). The bars 2 thus obtained have sharp edges capable of penetrating the body of the projectile at the ogive and for all angles of fire.
Pour un angle d'attaque a en site par rapport au plan de la grille 1, lorsque l'on compare la largeur exposée M par un barreau 2 de la grille 1 selon l'invention avec la largeur exposée K par un barreau de construction classique 100 (second barreau 100 matérialisé en pointillés) , on note que la première largeur exposée M est bien moindre que la seconde largeur exposée K d'un barreau de construction classique 100.  For an angle of attack a in relation to the plane of the grid 1, when comparing the exposed width M by a bar 2 of the grid 1 according to the invention with the exposed width K by a bar of conventional construction 100 (second bar 100 materialized in dotted lines), it is noted that the first exposed width M is much smaller than the second exposed width K of a conventional bar 100.
On notera que les montants 3 présentent les mêmes caractéristiques de section que les barreaux 2, de ce fait ils ont les mêmes propriétés et contribuent aussi à l'agression de l'ogive en plus de permettre à la grille d'être autoporteuse et de ne pas nécessiter des cadres ou des structures de soutien.  Note that the amounts 3 have the same sectional characteristics as the bars 2, so they have the same properties and also contribute to aggression of the warhead in addition to allowing the grid to be self-supporting and not not require frameworks or support structures.
Selon la figure 3 et selon un second mode de réalisation de l'invention, la grille 1 peut avoir un profil général courbe ou anguleux obtenu par pliage. De par sa construction, la grille 1 ne présentant pas de protubérance ou de surépaisseurs, elle permet un empilement et une manutention aisée.  According to FIG. 3 and according to a second embodiment of the invention, the grid 1 may have a curved or angular general profile obtained by folding. Because of its construction, the grid 1 does not have any protuberance or extra thicknesses, it allows stacking and easy handling.

Claims

REVENDICATIONS
1. Grille (1) de protection contre un projectile, par exemple de type roquette comprenant un corps prolongé par une fusée, grille (1) comportant des barreaux (2) reliés par des montants (3), la largeur entre les barreaux (2) étant comprise entre le diamètre maximal de la fusée et le diamètre maximal du corps du projectile, grille (1) de protection caractérisée en ce que la grille (1) est monobloc et a une épaisseur (4) qui est inférieure à trois fois l'épaisseur (5) d'un barreau (2), la section des barreaux (2) et des montants (3) étant polygonale à angles vifs.  1. Grid (1) for protection against a projectile, for example rocket type comprising a body extended by a rocket, grid (1) having bars (2) connected by uprights (3), the width between the bars (2). ) being between the maximum diameter of the rocket and the maximum diameter of the body of the projectile, grid (1) protection characterized in that the grid (1) is monobloc and has a thickness (4) which is less than three times the thickness (5) of a bar (2), the section of the bars (2) and uprights (3) being polygonal at sharp angles.
2. Grille (1) de protection selon la revendication 1 caractérisée en ce que son épaisseur (4) est inférieure à 15 mm.  2. Grid (1) of protection according to claim 1 characterized in that its thickness (4) is less than 15 mm.
3. Grille (1) de protection selon une des revendications 3. Grid (1) of protection according to one of the claims
1 à 2 caractérisée en ce que la dureté du matériau qui la constitue est supérieure à 350 HRB. 1 to 2 characterized in that the hardness of the material which constitutes it is greater than 350 HRB.
4. Grille (1) de protection selon une des revendications 1 à 3 caractérisée en ce que les montants (3) sont répartis en alternance d'une rangée de barreaux (2) à l'autre sur l'ensemble de la grille (1) .  4. Grid (1) of protection according to one of claims 1 to 3 characterized in that the uprights (3) are alternately distributed from one row of bars (2) to the other on the entire grid (1 ).
5. Grille (1) de protection selon une des revendications 1 à 4 caractérisée en ce qu'elle est plane.  5. Grid (1) of protection according to one of claims 1 to 4 characterized in that it is flat.
6. Grille (1) de protection selon une des revendications 1 à 5 caractérisée en ce que son épaisseur est constante.  6. Grid (1) of protection according to one of claims 1 to 5 characterized in that its thickness is constant.
7. Grille (1) de protection selon une des revendications 1 à 6 caractérisée en ce qu'elle comporte au moins une zone de fixation plane (10) comportant elle-même au moins un perçage ( 11 ) .  7. Grid (1) of protection according to one of claims 1 to 6 characterized in that it comprises at least one planar fastening zone (10) itself having at least one hole (11).
EP12709895.2A 2011-01-21 2012-01-25 Protective screen Active EP2665984B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1100191A FR2970773B1 (en) 2011-01-21 2011-01-21 PROTECTION GRID
PCT/FR2012/000032 WO2012098317A1 (en) 2011-01-21 2012-01-25 Protective screen

Publications (2)

Publication Number Publication Date
EP2665984A1 true EP2665984A1 (en) 2013-11-27
EP2665984B1 EP2665984B1 (en) 2016-03-30

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US (1) US9003945B2 (en)
EP (1) EP2665984B1 (en)
CA (1) CA2824641C (en)
ES (1) ES2574413T3 (en)
FR (1) FR2970773B1 (en)
IL (1) IL227452A (en)
WO (1) WO2012098317A1 (en)

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Also Published As

Publication number Publication date
FR2970773B1 (en) 2015-02-20
US20130312596A1 (en) 2013-11-28
EP2665984B1 (en) 2016-03-30
CA2824641C (en) 2017-02-21
WO2012098317A1 (en) 2012-07-26
CA2824641A1 (en) 2012-07-26
IL227452A (en) 2016-04-21
FR2970773A1 (en) 2012-07-27
IL227452A0 (en) 2013-09-30
US9003945B2 (en) 2015-04-14
ES2574413T3 (en) 2016-06-17

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