EP2482028B1 - Security and weaponry device with breakable bolt - Google Patents
Security and weaponry device with breakable bolt Download PDFInfo
- Publication number
- EP2482028B1 EP2482028B1 EP12290028.5A EP12290028A EP2482028B1 EP 2482028 B1 EP2482028 B1 EP 2482028B1 EP 12290028 A EP12290028 A EP 12290028A EP 2482028 B1 EP2482028 B1 EP 2482028B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shutter
- tongue
- substrate
- safety
- projectile
- 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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- 230000001133 acceleration Effects 0.000 claims abstract description 24
- 238000010304 firing Methods 0.000 claims abstract description 15
- 230000000903 blocking effect Effects 0.000 claims abstract 2
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 210000002105 tongue Anatomy 0.000 description 24
- 230000005540 biological transmission Effects 0.000 description 5
- 230000000977 initiatory effect Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- YSIBQULRFXITSW-OWOJBTEDSA-N 1,3,5-trinitro-2-[(e)-2-(2,4,6-trinitrophenyl)ethenyl]benzene Chemical compound [O-][N+](=O)C1=CC([N+](=O)[O-])=CC([N+]([O-])=O)=C1\C=C\C1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O YSIBQULRFXITSW-OWOJBTEDSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000037452 priming Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- XTFIVUDBNACUBN-UHFFFAOYSA-N 1,3,5-trinitro-1,3,5-triazinane Chemical compound [O-][N+](=O)N1CN([N+]([O-])=O)CN([N+]([O-])=O)C1 XTFIVUDBNACUBN-UHFFFAOYSA-N 0.000 description 1
- 239000004429 Calibre Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
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- 238000005459 micromachining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
- F42C15/18—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a carrier for an element of the pyrotechnic or explosive train is moved
- F42C15/184—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a carrier for an element of the pyrotechnic or explosive train is moved using a slidable carrier
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
- F42C15/24—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein the safety or arming action is effected by inertia means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
- F42C15/34—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein the safety or arming action is effected by a blocking-member in the pyrotechnic or explosive train between primer and main charge
Definitions
- the technical field of the invention is that of security and arming devices for a pyrotechnic chain of a projectile and in particular micro-machined security and arming devices.
- Security and arming devices are well known. They generally comprise a screen closing a transmission channel which connects a detonator and a pyrotechnic charge.
- the screen is thus interposed on the transmission of the detonation wave between the detonator and the load and it prevents the operation of the latter.
- the patent EP2077431 thus describes a micro-machined safety and arming device in which the arming is completely mechanical while satisfying the most demanding safety conditions.
- a first lock or acceleration lock is released during the firing.
- This lock moves back against the action of a return spring and it emerges from a rod secured to the shutter. Once cleared from the shutter, the first lock immobilizes relative to the substrate by appropriate indentations.
- a second latch or centrifugal latch is released by the displacement (under the effect of the rotation of the projectile) of a counterweight housed in the flap.
- Such a safety and arming device thus makes it possible to use two independent environmental conditions for arming: the longitudinal firing acceleration and the centrifugal acceleration. This double security allows this device to comply with the highest standards of projectile arming safety (STANAG 4187).
- the first lock in particular occupies a significant place in the device. It imposes an increase in the dimensions of the substrate of the component and also requires to provide on the movable flap a rod cooperating with the first lock. So that this rod does not remain protruding in the armed position in the pyrotechnic transmission channel, it is necessary to increase the stroke of the flap, which further penalizes the dimensions of the device.
- the object of the invention is to propose a micro-machined safety and arming device that does not have such a disadvantage.
- the device proposed by the invention incorporates a simplified structure acceleration lock which ensures both compactness and reliability for the device.
- the subject of the invention is a micro-machined or micro-engraved security and arming device for a pyrotechnic chain of a projectile, the device comprising a substrate on which is disposed a shutter ensuring the closure of a channel, flap which is movable in translation on the substrate, wherein the flap is held immobilized in the safety position by at least one acceleration lock which is released as a result of the application of the axial acceleration communicated to the projectile during firing , characterized in that the acceleration lock is constituted by at least one breakable tab connecting the flap to the substrate, oriented tongue and dimensioned so that the axial inertia forces developed during the firing and exerted on the flap cause the breaking of said tongue.
- At least one tongue may be oriented along the axis of the projectile so as to be stressed in tension or in compression.
- At least one tongue may be oriented perpendicular to the axis of the projectile so as to be stressed in shear.
- At least one tongue may be connected to the flap and / or the substrate by a support of increasing width between the tongue and the flap and / or the substrate.
- the figure 1 shows a projectile 1 of medium caliber (caliber less than 50 mm), which comprises a body 2 of axis 2a containing an explosive charge 3.
- the body 2 receives at its front part a rocket 4 which is screwed into a thread of 2.
- the fuse 4 comprises a housing 8 which contains a firing charge 5.
- the firing charge 5 is intended to be initiated by a pyrotechnic chain comprising a detonator 6 and a relay 7 (alternatively this relay 7 could be omitted and the detonator 6 would then directly initiate the priming charge 5).
- the detonator 6 is here a percussion detonator which is initiated by a striker 9 slidably mounted in a nose 10 secured to the casing 8 of the rocket 4. During the impact of the projectile 1 on a target, the striker 9 is projected onto the detonator 6. The striker is held in place during the storage and firing phases by a shear washer 11.
- the rocket 4 also contains a security and arming device 12 which makes it possible to interrupt the pyrotechnic chain during the storage and firing phases of the projectile 1.
- this safety and arming device is made in the form of a micro-machined or micro-engraved device (MEMS). It thus comprises a substrate 13 on which is mounted a sliding shutter 14 which ensures the interruption of the pyrotechnic chain.
- MEMS micro-machined or micro-engraved device
- the substrate 13 has two orifices 15a and 15b disposed on either side of the flap 14.
- the detonator 6 must have the minimum size to ensure operation and it will be coupled to a suitable pyrotechnic relay 7 (or 5). It has been verified that by using a detonator comprising an output stage of 10 milligrams of hexogen coupled to a very insensitive relay, for example in HNS (hexanitrostilbene), it was possible to make orifices 15a, 15b ( or transmission channels) of less than 1 mm 2 section (channel diameter of the order of mm) while guaranteeing the desired initiation transmission.
- HNS hexanitrostilbene
- the projectile 1 is also provided with a belt 2b which takes the stripes of the barrel of the weapon (not shown) and which communicates to the projectile 1 a rotational movement about its axis 2a during firing.
- the figure 2 shows in simplified manner the internal structure of a first embodiment of the safety and arming device 12 according to the invention.
- the device comprises a substrate 13 on which is disposed a pyrotechnic chain interruption flap 14 which is movable in translation on the substrate in a cavity 31.
- a pyrotechnic chain interruption flap 14 which is movable in translation on the substrate in a cavity 31.
- figure 2 an arrow A which indicates the direction of movement of the flap 14 during arming. This direction is perpendicular to the axis 2a of the projectile (which coincides with the axis 16 of the orifices 15a and 15b).
- the flap 14 is made by micro-machining or micro-etching according to MEMS production techniques which are well known to those skilled in the art.
- the chain interruption flap 14 is held immobilized by at least one acceleration lock 17.
- the device will also preferably include another shutter latch which will be released by centrifugal force.
- This type of lock is not the subject of the present invention. He was not represented to simplify the description. For example, the solution described by the EP2077431 cited in the preamble of this application.
- tabs 29 secured to the substrate 13 are engaged in notches 30 arranged on a side surface of the flap 14. These tabs do not prohibit the movement of the flap in the arming direction A. Tabs and notches constitute means for prohibiting the return of the flap in the safety position at the end of its arming movement.
- the device here comprises an axial acceleration latch 17 consisting of two breakable tongues 18 which connect the flap 14 to the substrate 13. Each tab is integral with a lateral edge 14a or 14b of the flap 14.
- the figure 3a shows enlargedly an embodiment of such a tongue 18.
- the tabs 18 ensuring the suspension of the shutter are oriented parallel to the axis of the projectile, so that the axial inertia forces F ⁇ , which are parallel to the axis 2a of the projectile, and which will be exerted on the flap 14 during firing will cause their break.
- F ⁇ axial inertia forces
- tongues 18 will be dimensioned such that this rupture only occurs for the inertia forces associated with the firing and not during the shocks received by the device during the handling phases or during the logistics operations.
- the width e of the tongue 18 will thus be calibrated to break during an acceleration of the order of 50000 m / s 2 , which is the order of magnitude of the accelerations experienced by the projectiles of medium caliber (lower caliber or equal to 40mm).
- the tongue 18 is connected to the flap 14 on the one hand and to the substrate 13 on the other hand by supports 20a and 20b whose width is increasing between the tongue 18 and the flap 14 on the one hand and the substrate 13 of somewhere else.
- These supports 20a, 20b are here triangular. Such an arrangement makes it possible to better control the location of the break on the tongue 18. By giving different dimensions to the widened supports 20a, 20b, it will be possible in particular to bring the rupture zone constituted by the tongue 18 closer to the flap or the substrate.
- the axial acceleration lock 17 may be produced in the form of tongues that are stressed in tension, in compression, or in tongues stressed in shear, or in a combination of several types of tongues.
- figure 3b an example of a device in which the tongue 18 is oriented perpendicular to the axis of the projectile (therefore perpendicular to the direction of F ⁇ ) so as to be stressed in shear.
- This solution is particularly well suited to the field of medium caliber projectiles for which the reversibility of the operation of the device (return to safety position) does not arise.
- the figure 2 shows tabs of the acceleration lock disposed between flap 14 and substrate 13 at longitudinal edges 14a and 14b which are parallel to Armament Directorate A of Part 14. On this figure 2 one of the tongues (the tongue of the upper edge 14a) is therefore biased in tension and the other tongue (that of the lower edge 14b) is biased in compression.
- This lock may comprise a tongue 18 working in shear as shown in FIG. figure 4a or a pulling tongue as shown in FIG. figure 4b .
- the Figures 5a and 5b show such embodiments of tabs 18 in the form of bars.
- the figure 5a shows a bar 18 oriented relative to the inertia forces F ⁇ so as to be broken by traction.
- the figure 5b shows a bar 18 oriented relative to the inertia forces F ⁇ so as to be broken by shearing.
- the acceleration latch according to the invention has been described here by way of non-limiting example in its application to a safety and arming device in which the direction of action of the pyrotechnic chain is substantially parallel to the plane of the flap. .
- This lock could also be envisaged for devices in which the shutter does not ensure the interruption of a pyrotechnic chain but the interruption of an optical control signal (for example for an initiation of an explosive by a laser beam ).
- Such devices are known especially from EP1559986 , EP1559987 .
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Air Bags (AREA)
- Micromachines (AREA)
- Lock And Its Accessories (AREA)
Abstract
Description
Le domaine technique de l'invention est celui des dispositifs de sécurité et d'armement pour une chaîne pyrotechnique d'un projectile et notamment des dispositifs de sécurité et d'armement micro-usinés.The technical field of the invention is that of security and arming devices for a pyrotechnic chain of a projectile and in particular micro-machined security and arming devices.
Les dispositifs de sécurité et d'armement (ou DSA) sont bien connus. Ils comportent généralement un écran obturant un canal de transmission qui relie un détonateur et une charge pyrotechnique.Security and arming devices (or DSAs) are well known. They generally comprise a screen closing a transmission channel which connects a detonator and a pyrotechnic charge.
L'écran s'interpose ainsi sur la transmission de l'onde détonique entre le détonateur et la charge et il empêche le fonctionnement de cette dernière.The screen is thus interposed on the transmission of the detonation wave between the detonator and the load and it prevents the operation of the latter.
Un des problèmes rencontrés avec les dispositifs classiques est leur encombrement. Les pièces sont relativement massives pour pouvoir assurer l'interruption de la chaîne pyrotechnique. Les moyens moteurs permettant de déplacer l'écran doivent donc être puissants. On utilise le plus souvent des ressorts qui restent bandés au cours des phases de stockage, ce qui peut conduire à une dégradation de leurs caractéristiques mécaniques et à une perte de la fiabilité de l'armement.One of the problems encountered with conventional devices is their size. The pieces are relatively massive to be able to ensure the interruption of the pyrotechnic chain. The motor means for moving the screen must be powerful. In most cases, springs are used which remain bandaged during the storage phases, which can lead to a degradation of their mechanical characteristics and to a loss of reliability of the armament.
Depuis quelques années il a été proposé de réaliser tout ou partie des dispositifs de sécurité et d'armement à l'aide de puces incorporant des éléments électro mécaniques micro usinés ou micro gravés, soit dans un élément déposé sur un substrat, soit directement sur le substrat lui-même. Cette technologie connue sous le nom de MEMS (Micro Electro Mechanical System) permet en effet aujourd'hui de réaliser des micro mécanismes en mettant en oeuvre une technique proche de celle permettant de réaliser les circuits intégrés électroniques.In recent years it has been proposed to carry out all or part of the safety and arming devices using chips incorporating electromechanical micro-machined or micro-etched elements, either in an element deposited on a substrate, or directly on the substrate itself. This technology known under the name of MEMS (Micro Electro Mechanical System) makes it possible today to achieve micro mechanisms by implementing a technique similar to that for producing electronic integrated circuits.
Le brevet
Ainsi un premier verrou ou verrou d'accélération est libéré lors du tir. Ce verrou recule contre l'action d'un ressort de rappel et il se dégage d'une tige solidaire du volet. Une fois dégagé du volet, le premier verrou s'immobilise par rapport au substrat grâce à des indentations appropriées.Thus a first lock or acceleration lock is released during the firing. This lock moves back against the action of a return spring and it emerges from a rod secured to the shutter. Once cleared from the shutter, the first lock immobilizes relative to the substrate by appropriate indentations.
Un deuxième verrou ou verrou centrifuge est libéré par le déplacement (sous l'effet de la rotation du projectile) d'une masselotte logée dans le volet.A second latch or centrifugal latch is released by the displacement (under the effect of the rotation of the projectile) of a counterweight housed in the flap.
Un tel dispositif de sécurité et d'armement permet donc d'utiliser pour assurer l'armement deux conditions d'environnement indépendantes : l'accélération longitudinale de tir et l'accélération centrifuge. Cette double sécurité permet à ce dispositif d'être conforme aux normes les plus exigeantes en matière de sécurité d'armement des projectiles (STANAG 4187).Such a safety and arming device thus makes it possible to use two independent environmental conditions for arming: the longitudinal firing acceleration and the centrifugal acceleration. This double security allows this device to comply with the highest standards of projectile arming safety (STANAG 4187).
Ce dispositif de sécurité et d'armement présente cependant des inconvénients.This safety and arming device, however, has disadvantages.
Le premier verrou en particulier (verrou d'accélération) occupe une place non négligeable dans le dispositif. Il impose une augmentation des dimensions du substrat du composant et oblige par ailleurs à prévoir sur le volet mobile une tige coopérant avec ce premier verrou. Pour que cette tige ne reste pas saillante en position armée dans le canal de transmission pyrotechnique, il est nécessaire d'accroître la course du volet, ce qui pénalise encore les dimensions du dispositif.The first lock in particular (acceleration lock) occupies a significant place in the device. It imposes an increase in the dimensions of the substrate of the component and also requires to provide on the movable flap a rod cooperating with the first lock. So that this rod does not remain protruding in the armed position in the pyrotechnic transmission channel, it is necessary to increase the stroke of the flap, which further penalizes the dimensions of the device.
L'invention a pour but de proposer un dispositif de sécurité et d'armement micro usiné, ne présentant pas un tel inconvénient.The object of the invention is to propose a micro-machined safety and arming device that does not have such a disadvantage.
Le dispositif proposé par l'invention incorpore un verrou d'accélération de structure simplifiée qui permet d'assurer à la fois compacité et fiabilité pour le dispositif.The device proposed by the invention incorporates a simplified structure acceleration lock which ensures both compactness and reliability for the device.
Ainsi l'invention a pour objet un dispositif de sécurité et d'armement micro-usiné ou micro-gravé pour une chaîne pyrotechnique d'un projectile, dispositif comprenant un substrat sur lequel est disposé un volet assurant l'obturation d'un canal, volet qui est mobile en translation sur le substrat, dispositif dans lequel le volet est maintenu immobilisé en position de sécurité par au moins un verrou d'accélération qui est libéré comme suite à l'application de l'accélération axiale communiquée au projectile lors du tir, dispositif caractérisé en ce que le verrou d'accélération est constitué par au moins une languette cassable reliant le volet au substrat, languette orientée et dimensionnée de telle sorte que les efforts d'inertie axiaux développés lors du tir et s'exerçant sur le volet provoquent la rupture de ladite languette.Thus, the subject of the invention is a micro-machined or micro-engraved security and arming device for a pyrotechnic chain of a projectile, the device comprising a substrate on which is disposed a shutter ensuring the closure of a channel, flap which is movable in translation on the substrate, wherein the flap is held immobilized in the safety position by at least one acceleration lock which is released as a result of the application of the axial acceleration communicated to the projectile during firing , characterized in that the acceleration lock is constituted by at least one breakable tab connecting the flap to the substrate, oriented tongue and dimensioned so that the axial inertia forces developed during the firing and exerted on the flap cause the breaking of said tongue.
Au moins une languette pourra être orientée suivant l'axe du projectile de façon à être sollicitée en traction ou en compression.At least one tongue may be oriented along the axis of the projectile so as to be stressed in tension or in compression.
Au moins une languette pourra être orientée perpendiculairement à l'axe du projectile de façon à être sollicitée en cisaillement.At least one tongue may be oriented perpendicular to the axis of the projectile so as to be stressed in shear.
Au moins une languette pourra être reliée au volet et/ou au substrat par un support de largeur croissante entre la languette et le volet et/ou le substrat.At least one tongue may be connected to the flap and / or the substrate by a support of increasing width between the tongue and the flap and / or the substrate.
D'autres avantages apparaîtront à la lecture de la description qui va suivre de modes particuliers de réalisation, description faite en référence aux dessins annexés et dans lesquels :
- la
figure 1 est une vue schématique en coupe d'un projectile de moyen calibre équipé d'une fusée incorporant un dispositif de sécurité et d'armement selon l'invention, - la
figure 2 est une vue simplifiée d'un mode de réalisation du dispositif de sécurité et d'armement selon l'invention dans sa position de sécurité, - les
figures 3a et 3b sont des vues agrandies de deux exemples de réalisation d'une languette d'un verrou d'accélération, - les
figures 4a et 4b sont des vues agrandies de deux autres exemples de réalisation d'une languette d'un verrou d'accélération, - les
figures 5a et 5b sont des vues agrandies de deux autres exemples de réalisation d'une languette d'un verrou d'accélération.
- the
figure 1 is a schematic sectional view of a medium-caliber projectile equipped with a rocket incorporating a security and arming device according to the invention, - the
figure 2 is a simplified view of an embodiment of the safety and arming device according to the invention in its safety position, - the
Figures 3a and 3b are enlarged views of two embodiments of a tab of an acceleration lock, - the
Figures 4a and 4b are enlarged views of two other embodiments of a tab of an acceleration lock, - the
Figures 5a and 5b are enlarged views of two other embodiments of a tab of an acceleration lock.
La
Il est bien entendu possible de mettre en oeuvre le dispositif selon l'invention avec un détonateur 6 électrique commandé par exemple par un moyen électronique de chronométrie ou un détecteur de proximité.It is of course possible to implement the device according to the invention with an
La fusée 4 renferme également un dispositif de sécurité et d'armement 12 qui permet d'interrompre la chaîne pyrotechnique au cours des phases de stockage et de début de tir du projectile 1.The
Conformément à l'invention, ce dispositif de sécurité et d'armement est réalisé sous la forme d'un dispositif micro-usiné ou micro-gravé (MEMS). Il comprend ainsi un substrat 13 sur lequel est monté un volet coulissant 14 qui assure l'interruption de la chaîne pyrotechnique.According to the invention, this safety and arming device is made in the form of a micro-machined or micro-engraved device (MEMS). It thus comprises a
Le substrat 13 comporte deux orifices 15a et 15b disposés de part et d'autre du volet 14. L'axe de ces orifices 15a, 15b, donc la direction d'action de la chaîne pyrotechnique (6-7), est ainsi sensiblement parallèle au plan du volet 14. Cet axe est aussi confondu avec l'axe 2a du projectile.The
Une telle disposition d'un volet d'interruption de chaîne pyrotechnique de telle sorte que la direction de la chaîne pyrotechnique se trouve en regard de l'épaisseur du volet 14 et non perpendiculaire au plan du volet (comme dans les dispositifs MEMS habituels) est connue notamment du brevet
L'Homme du Métier se reportera à ce brevet qui décrit les caractéristiques générales d'un tel type de chaîne d'amorçage et du volet qui lui est associé.Those skilled in the art will refer to this patent which describes the general characteristics of such a type of priming chain and the shutter associated therewith.
On note ainsi que le détonateur 6 devra avoir la taille minimale permettant d'assurer le fonctionnement et il sera couplé à un relais pyrotechnique 7 (ou 5) approprié. On a pu vérifier qu'en mettant en oeuvre un détonateur comportant un étage de sortie de 10 milligrammes d'Hexogène couplé à un relais très peu sensible, par exemple en HNS (hexanitrostilbène), il était possible de réaliser des orifices 15a, 15b (ou canaux de transmission) de moins de 1 mm2 de section (diamètre de canal de l'ordre du mm) tout en garantissant la transmission d'initiation souhaitée.It should be noted that the
Il est ainsi possible d'assurer une interruption de l'effet pyrotechnique avec un volet de silicium ayant une longueur L de l'ordre de 3 mm ce qui est tout à fait réalisable avec les technologie MEMS. Cette longueur de silicium de l'ordre de 3mm correspond donc ici à la dimension L du volet 14 repérée sur les
Le projectile 1 est par ailleurs doté d'une ceinture 2b qui prend les rayures du tube de l'arme (non représenté) et qui communique au projectile 1 un mouvement de rotation autour de son axe 2a lors du tir.The
La
Le dispositif comprend un substrat 13 sur lequel est disposé un volet 14 d'interruption de chaîne pyrotechnique qui est mobile en translation sur le substrat dans une cavité 31. On a représenté sur la
Le volet 14 est réalisé par micro-usinage ou micro-gravure suivant les techniques de réalisation des MEMS qui sont bien connues de l'Homme du Métier.The
On a représenté sur la
Le volet 14 d'interruption de chaîne est maintenu immobilisé par au moins un verrou d'accélération 17.The
Le dispositif comportera également de préférence un autre verrou du volet qui sera libéré grâce à la force centrifuge. Ce type de verrou ne fait pas l'objet de la présente invention. Il n'a donc pas été représenté pour simplifier la description. On pourra considérer par exemple la solution décrite par le
On notera également que des languettes 29 solidaires du substrat 13 viennent s'engager dans des encoches 30 aménagées sur une surface latérale du volet 14. Ces languettes n'interdisent pas le déplacement du volet suivant la direction d'armement A. Languettes et encoches constituent un moyen permettant d'interdire le retour du volet en position de sécurité à l'issue de son mouvement d'armement.Note also that
Le dispositif comprend ici un verrou d'accélération axiale 17 constitué par deux languettes cassables 18 qui relient le volet 14 au substrat 13. Chaque languette est solidaire d'un bord latéral 14a ou 14b du volet 14. La
Les languettes 18 assurant la suspension du volet sont orientées parallèlement à l'axe du projectile, donc de telle sorte que les efforts d'inertie axiaux Fγ, qui sont parallèles à l'axe 2a du projectile, et qui s'exerceront sur le volet 14 lors du tir provoqueront leur rupture. On a représenté sur la
Par ailleurs les languettes 18 seront dimensionnées de telle sorte que cette rupture n'intervienne que pour les efforts d'inertie liés au tir et non lors des chocs reçus par le dispositif lors des phases de manipulation ou bien au cours des opérations logistiques.In addition, the
La largeur e de la languette 18 sera ainsi calibrée pour se rompre lors d'une accélération de l'ordre de 50000 m/s2, ce qui est l'ordre de grandeur des accélérations subies par les projectiles de moyen calibre (calibre inférieur ou égal à 40mm).The width e of the
On remarque sur la
Suivant l'architecture du dispositif 12 on pourra réaliser le verrou d'accélération axiale 17 sous la forme de languettes sollicitées en traction, en compression ou bien de languettes sollicitées en cisaillement ou bien d'une combinaison de plusieurs types de languettes.Depending on the architecture of the
On a représenté à titre d'exemple à la
Le fait de réaliser le premier verrou sous la forme de languettes cassables permet de rendre le dispositif plus compact. On n'est plus en effet obligé de définir un mécanisme de verrouillage spécifique associant verrous et ressorts de rappel. La simplification du mécanisme rend également le dispositif plus fiable.Making the first lock in the form of breakable tabs makes the device more compact. It is no longer necessary to define a specific locking mechanism associating locks and return springs. The simplification of the mechanism also makes the device more reliable.
Cette solution est particulièrement bien adaptée au domaine des projectiles de moyen calibre pour lequel la réversibilité du fonctionnement du dispositif (retour en position de sécurité) ne se pose pas.This solution is particularly well suited to the field of medium caliber projectiles for which the reversibility of the operation of the device (return to safety position) does not arise.
La
A titre de variante il est possible de disposer une languette d'un verrou 17 selon l'invention au niveau du bord latéral 14c. Ce verrou pourra comprendre une languette 18 travaillant en cisaillement comme représentée à la
On pourrait aussi dans certains cas, et en fonction des contraintes d'intégration, réaliser des languettes simples sous la forme de barrettes rectangulaires.One could also in some cases, and depending on integration constraints, achieve simple tabs in the form of rectangular bars.
Les
On a décrit ici à titre d'exemple non limitatif le verrou d'accélération selon l'invention dans son application à un dispositif de sécurité et d'armement dans lequel la direction d'action de la chaîne pyrotechnique est sensiblement parallèle au plan du volet.The acceleration latch according to the invention has been described here by way of non-limiting example in its application to a safety and arming device in which the direction of action of the pyrotechnic chain is substantially parallel to the plane of the flap. .
Il est clair pour l'Homme du Métier qu'il est possible de mettre en oeuvre l'invention pour tout autre type de dispositif de sécurité et d'armement à volet mobile.It is clear to those skilled in the art that it is possible to implement the invention for any other type of security device and armament with movable flap.
On pourrait par exemple envisager un tel verrou d'accélération pour des dispositifs de sécurité et d'armement dans lesquels la direction d'action de la chaîne pyrotechnique est perpendiculaire au volet. De tels dispositifs sont décrits par exemple par
On pourrait aussi envisager ce verrou pour les dispositifs dans lesquels le volet n'assure pas l'interruption d'une chaîne pyrotechnique mais l'interruption d'un signal de commande optique (par exemple pour une initiation d'un explosif par un rayon laser). De tels dispositifs sont connus en particulier de
On pourrait aussi utiliser un verrou selon l'invention pour les dispositifs de sécurité et d'armement dans lesquels le volet interrompt un canal de passage d'une plaquette projetée par un détonateur (de type "slapper"), ce dispositif est décrit par exemple par
On pourra enfin mettre en oeuvre l'invention dans les dispositifs de sécurité et d'armement pour lesquels le volet porte lui-même une composition pyrotechnique pour l'introduire dans une chaîne d'initiation, dispositifs tels que décrits par exemple par les brevets
Claims (4)
- A micro-machined or micro-engraved safety and arming device (12) for a projectile pyrotechnic train, device comprising a substrate (13) onto which a shutter (14) is positioned to ensure the blocking of a channel, such shutter being mobile in translation on the substrate (13), device in which the shutter (14) is held immobile in the safety position by at least one acceleration lock that is released further to the application of the axial acceleration imparted to the projectile during firing, device wherein the acceleration lock (17) is constituted by at least one breakable tongue (18) linking the shutter (18) to the substrate, tongue (18) oriented and dimensioned such that the axial inertial stresses developed during firing and exerted on the shutter (14) cause the said tongue (18) to break.
- A safety and arming device according to Claim 1, wherein at least one tongue (18) is oriented along the axis (2a) of the projectile so as to be stressed in traction or in compression.
- A safety and arming device according to Claim 2, wherein at least one tongue (18) is oriented perpendicularly to the projectile axis (2a) so as to be shear stressed.
- A safety and arming device according to one of Claims 2 or 3, wherein at least one tongue (18) is linked to the shutter (14) and/or to the substrate (13) by a support (20a, 20b) of increasing width between the tongue (18) and the shutter (14) and/or the substrate (13).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL12290028T PL2482028T3 (en) | 2011-01-31 | 2012-01-25 | Security and weaponry device with breakable bolt |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1100310A FR2971048B1 (en) | 2011-01-31 | 2011-01-31 | SECURITY AND ARMING DEVICE WITH A CASSABLE LATCH |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2482028A1 EP2482028A1 (en) | 2012-08-01 |
EP2482028B1 true EP2482028B1 (en) | 2013-11-20 |
Family
ID=45531833
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12290028.5A Active EP2482028B1 (en) | 2011-01-31 | 2012-01-25 | Security and weaponry device with breakable bolt |
Country Status (5)
Country | Link |
---|---|
US (1) | US8689690B2 (en) |
EP (1) | EP2482028B1 (en) |
ES (1) | ES2442908T3 (en) |
FR (1) | FR2971048B1 (en) |
PL (1) | PL2482028T3 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10837747B2 (en) * | 2018-02-15 | 2020-11-17 | Goodrich Corporation | High explosive firing mechanism |
FR3110687B1 (en) | 2020-05-20 | 2022-05-27 | Nexter Munitions | Sub-caliber projectile and method for neutralizing a target using such a projectile. |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6173650B1 (en) | 1999-06-30 | 2001-01-16 | The United States Of America As Represented By The Secretary Of The Navy | MEMS emergetic actuator with integrated safety and arming system for a slapper/EFI detonator |
US6622629B2 (en) | 2001-10-17 | 2003-09-23 | Northrop Grumman Corporation | Submunition fuzing and self-destruct using MEMS arm fire and safe and arm devices |
US6964231B1 (en) * | 2002-11-25 | 2005-11-15 | The United States Of America As Represented By The Secretary Of The Army | Miniature MEMS-based electro-mechanical safety and arming device |
GB0305414D0 (en) | 2003-03-08 | 2003-04-16 | Qinetiq Ltd | Electronic safety and arming unit |
US7142087B2 (en) * | 2004-01-27 | 2006-11-28 | Lucent Technologies Inc. | Micromechanical latching switch |
US7216589B2 (en) | 2004-01-27 | 2007-05-15 | Lucent Technologies Inc. | Fuse for projected ordnance |
US7320286B2 (en) * | 2004-10-18 | 2008-01-22 | Aai Corporation | Setback switch for safe and arm |
FR2884602A1 (en) * | 2005-04-18 | 2006-10-20 | Novatec Sa Sa Soc | High-security pyrotechnic procedure, e.g. for deploying spacecraft solar panels, uses short-circuited initiation resistance and normally-closed interrupter switch |
FR2892810B1 (en) | 2005-10-27 | 2010-05-14 | Giat Ind Sa | PYROTECHNIC SECURITY DEVICE WITH MICROSCREEN SCREEN |
US7552681B1 (en) | 2007-07-31 | 2009-06-30 | The United States Of America As Represented By The Secretary Of The Navy | MEMS fuze assembly |
US7490552B1 (en) | 2007-07-31 | 2009-02-17 | The United States Of America As Represented By The Secretary Of The Navy | MEMS microdetonator/initiator apparatus for a MEMS fuze |
FR2926134B1 (en) * | 2008-01-07 | 2010-03-26 | Nexter Munitions | MICRO-FACTORY OR MICRO-GRAVE SECURITY AND ARMING DEVICE |
FR2971050B1 (en) * | 2011-01-31 | 2013-01-18 | Nexter Munitions | SECURITY AND ARMING DEVICE FOR A PYROTECHNIC CHAIN OF A PROJECTILE |
-
2011
- 2011-01-31 FR FR1100310A patent/FR2971048B1/en not_active Expired - Fee Related
-
2012
- 2012-01-25 PL PL12290028T patent/PL2482028T3/en unknown
- 2012-01-25 EP EP12290028.5A patent/EP2482028B1/en active Active
- 2012-01-25 ES ES12290028.5T patent/ES2442908T3/en active Active
- 2012-01-26 US US13/358,719 patent/US8689690B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
US20120192746A1 (en) | 2012-08-02 |
US8689690B2 (en) | 2014-04-08 |
ES2442908T3 (en) | 2014-02-14 |
PL2482028T3 (en) | 2014-04-30 |
EP2482028A1 (en) | 2012-08-01 |
FR2971048A1 (en) | 2012-08-03 |
FR2971048B1 (en) | 2013-01-11 |
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