EP0207822A1 - Safety device for an explosive projectile to be launched from a barrel - Google Patents
Safety device for an explosive projectile to be launched from a barrel Download PDFInfo
- Publication number
- EP0207822A1 EP0207822A1 EP86401088A EP86401088A EP0207822A1 EP 0207822 A1 EP0207822 A1 EP 0207822A1 EP 86401088 A EP86401088 A EP 86401088A EP 86401088 A EP86401088 A EP 86401088A EP 0207822 A1 EP0207822 A1 EP 0207822A1
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- EP
- European Patent Office
- Prior art keywords
- locking means
- safety device
- spring
- flap
- shape memory
- 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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- 239000002360 explosive Substances 0.000 title claims abstract description 11
- 230000008859 change Effects 0.000 claims abstract description 5
- 238000006073 displacement reaction Methods 0.000 claims abstract 2
- 238000013519 translation Methods 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 4
- 230000014616 translation Effects 0.000 claims 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000010304 firing Methods 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 230000009466 transformation Effects 0.000 description 4
- 230000004913 activation Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- -1 copper-zinc -aluminum Chemical compound 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910001000 nickel titanium Inorganic materials 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 2
- GDYSGADCPFFZJM-UHFFFAOYSA-N [Ag].[Pt].[Au] Chemical compound [Ag].[Pt].[Au] GDYSGADCPFFZJM-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- KHYBPSFKEHXSLX-UHFFFAOYSA-N iminotitanium Chemical compound [Ti]=N KHYBPSFKEHXSLX-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
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- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 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
- F42C15/38—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein arming is effected by chemical action
Definitions
- the technical sector of the present invention is that of safety devices for explosive devices of the mine, missile or rocket type.
- an explosive device must have two safety systems that can be operated independently of one another.
- a safety screen or shutter is generally used, interrupting the pyrotechnic chain of the device and capable of fulfilling all the safety requirements.
- the operation of the machine must be such that the safety devices should not be erased until after a certain time after launch, which requires detection of the ejection order.
- the object of the present invention is to provide a safety device usable in explosive devices of the type mine, missile or rocket launched using a tube mounted for example on a helicopter.
- the invention therefore relates to a safety device for an explosive device of the rocket or missile mine type, launched from a tube comprising in particular a safety flap held by a first locking means the erasure of which is prohibited by a means blocking device, characterized in that it comprises a second means for locking the flap, indexed on the tube and an intermediate locking means for the movement of the second locking means cooperating with the locking means, on the one hand, and a spring with shape memory, the change of mechanical characteristics of which clears the blocking means.
- a result of the present invention lies in its small footprint allowing miniaturization.
- the device according to the invention replaces the ejection order detector and the arming delay.
- the spring by its elongation and its retraction with delay, plays a double role.
- the invention therefore makes use of the shape memory effect by activation that certain alloys have, the most common of which is a nickel-titanium alloy (50/50), copper-zinc -aluminum / copper-aluminum-nickel or gold- silver- platinum.
- a shape memory alloy is an alloy which, having undergone deformation, regains its initial shape as soon as its temperature increases under the effect of the passage of an electric current. This effect is different from that of a bimetallic strip because it only occurs at a particular temperature which is chosen during its definition and does not regain its previous form unless it is subjected to a new mechanical deformation. This effect results from a reversible martensic transformation, that is to say a modification of the crystal structure.
- the alloy To have a shape memory, the alloy must undergo a transformation reversible austenite-martensite of its crystal structure. This transformation, which occurs without diffusion, consists in the passage of the so-called austenitic structure in the high temperature phase into a different crystalline structure called martensic by cooling the alloy. Many alloys have a martensic transformation, but shape memory alloys have an extremely symmetrical martensic structure. These have a typical centered cubic structure in the austenitic phase and a highly twinned structure in the martensic phase. This twin structure allows the alloy to absorb significant shape changes and return to the initial shape when returning to the austenitic structure.
- the force due to shape memory is determined by starting from the force which a spring can exert according to Hocke's law before the characteristics of the austenitic Ni-Ti alloy.
- the corresponding stroke is determined by considering the modulus of this martensic alloy and the force obtained from the austenitic form.
- the flap is part of a pyrotechnic chain shown in fig. 2, of a completely classic type.
- the shutter 2 is held stationary by two latches 4 and 5 integrated in the respective housings 6 and 7 formed in the body of the projectile.
- the lock comprises a body 4a whose external diameter corresponds to the internal diameter of the housing 6, extended by frustoconical bearing surfaces on which one bears a ball 8 constituting the locking means.
- the body 4a is extended on the flap side 2 by a rod 4b engaging in a hole 9 in the flap, the external diameter of this end being less than that of the body.
- a helical spring 10 is disposed around the end 4b between the body 4a and a shoulder 11 of the housing 6.
- the other end 4c of the body is subjected to the action of a spring 12 with shape memory bearing on a plate 13.
- the latch 5 is engaged at one end in a hole 14 in the flap and bears at the other end on the launching tube 3.
- the latch 5 comprises, in the vicinity of the flap 2, a radial hole or a groove 15, the cooperation of which with the intermediate locking means will be explained below, the other end being supported on the tube 3.
- the lock 5 is provided with a shoulder 16.
- a helical spring 17 is disposed between the shoulder 16 and a stop 18 of the housing 7 and ensures, after ejection of the machine, the release of the flap 2 by the lock 5
- the latch 5 is arranged perpendicular to the latch 4.
- the intermediate locking means represented by the latch 19, is arranged parallel to the latch 4 in a housing 20a, in which it slides and comes to bear on a stop 20b.
- This lock 19 comprises a body 19a and a cylindrical finger 19b; the body 19a consists of a frustoconical part bearing on the ball 8 and a cylindrical part whose external diameter corresponds to the internal diameter of the housing 20a.
- This cylindrical part is provided with a circular groove 21 intended to cooperate with the ball 8.
- a spring 22 is arranged around the finger 19b and bears on the body 19a and on a shoulder 23 of the housing 20.
- the finger 19b engages in the radial hole 15 of the latch 5 so as to prohibit its possible translation.
- Fig. 2 shows a section A-A according to FIG. 1 where we see the flap 2, the hole 9, the latches 5 and 10 and the pyrotechnic elements adjacent to the flap. These elements are for example constituted upstream of the shutter 2, the primer 24 initiated electrically for example and downstream by the priming relay 25.
- the alignment of the pyrotechnic chain is achieved by translation or rotation of the flap 2 in which a relay 26 is inserted. Thus, the relay 26 is aligned with the primer 24 and the relay 25 which ensures the transmission of the detonation.
- FIGS. 3, 4 and 5 The operation of the device is illustrated in FIGS. 3, 4 and 5.
- the spring 12 Before launching the machine 1, the spring 12 is supplied with a tension U (fig. 3) which has the effect of raising its temperature above the threshold causing its change in characteristics. The extension of this spring causes the translation of the lock 4 and the compression of the spring 10. The ball 8 can then disappear under the action of the intermediate lock 19 actuated by the spring 22. The lock 5 is then released but remains stationary as long as device 1 remains in tube 3.
- the spring 17 causes the translation of the latch 5 and releases the screen 2.
- the stroke of the latch 19 is calculated so that the ball 8 can be erased in the notch 21 of the latch 19.
- the tension U then disappears and the spring 12 loses after a certain time cooling its mechanical characteristics.
- the spring 12 no longer opposes the opposite action of the spring 10 (fig. 5) and the translation of the latch 4 causes the ball 8 to be completely erased in the notch 21.
- the final unlocking of the screen 2 is thus achieved and the translation or rotation thereof can occur, under the effect of a spring not shown, to align the pyrotechnic chain.
- the flap then comprises a first imprint 27 in which is placed a ball 28 held in place by the latch 4, the release of which is prohibited by the ball 8, cooperating with the conical bearing surface 29 of this latch and a second imprint 30 in which is placed a ball 31 held in place by the latch 5 bearing on the launching tube.
- the latch 19 consists of a body 32 having a blind longitudinal bore 33 inside which slides an axis 34 provided with a stop 35.
- the body 32 is terminated by a claw 36 for hooking the spring 12, and comprises an internal shoulder 37.
- a helical spring 38 is placed around the axis 34 between the stop 35 and the shoulder 37.
- the body also has an external groove 21 intended to cooperate with the ball 8.
- the spring 12 with shape memory is connected to an electric power source 39 delivering the current necessary for its heating.
- the operation is as follows. Prior to the launch of the explosive device 1, the spring 12 is supplied with a voltage U, which has the effect of raising its temperature above the threshold causing its change in characteristics. The spring 12 is compressed and causes the translation of the body 32 compressing the spring 38. The latch 5 is then released. After launching the machine, the lock is no longer held by the tube 3 and the spring 17 acts by releasing the ball 31.
- the supply of the spring 12 is cut off, which causes its previous mechanical characteristics to disappear.
- the spring 38 can then come into action which causes the translation of the body 32 until the groove 21 arrives at the level of the ball 8.
- the ball 8 is then driven into the groove 21 by the conical bearing 29 of the latch 4 under the effect of the spring 11.
- the ball 28 is then released and the flap 2 can be actuated in a conventional manner either by translation or by rotation to align the pyrotechnic chain as described in relation to FIG. 2.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Toys (AREA)
Abstract
Description
Le secteur technique de la présente invention est celui des dispositifs de sécurité pour les engins explosifs de type mine, missile ou roquette.The technical sector of the present invention is that of safety devices for explosive devices of the mine, missile or rocket type.
On sait qu'un engin explosif doit être muni de deux systèmes de sécurité actionnables indépendamment l'un de l'autre. On utilise généralement un écran ou volet de sécurité interrompant la chaîne pyrotechnique de l'engin et apte à remplir toutes les exigences de sécurité. Le fonctionnement de l'engin doit être tel que les dispositifs de sécurité ne doivent s'effacer qu'après un certain temps après le lancement, ce qui impose la détection de l'ordre d'éjection.We know that an explosive device must have two safety systems that can be operated independently of one another. A safety screen or shutter is generally used, interrupting the pyrotechnic chain of the device and capable of fulfilling all the safety requirements. The operation of the machine must be such that the safety devices should not be erased until after a certain time after launch, which requires detection of the ejection order.
Les systèmes actuels de détection sont soit électromécaniques soit pyrotechniques lorsque le signal d'éjection est électrique.Current detection systems are either electromechanical or pyrotechnic when the ejection signal is electric.
L'inconvénient des systèmes électromécaniques réside dans les faibles efforts conduisant à leur activation et surtout dans leur encombrement relativement important, ce qui est incompatible avec des engins explosifs de faible volume.The drawback of electromechanical systems lies in the low forces leading to their activation and especially in their relatively large size, which is incompatible with explosive devices of small volume.
Quant aux systèmes pyrotechniques, on sait, compte tenu de la faible énergie qu'il faut leur donner pour les faire fonctionner, qu'il n'est pas possible d'obtenir une sécurité satisfaisante. De plus, des effets secondaires dus aux gaz produits ou à l'onde de choc ne peuvent être maîtrisés complètement.As for pyrotechnic systems, it is known, given the low energy that must be given to them to operate them, that it is not possible to obtain satisfactory safety. In addition, side effects from the gases produced or the shock wave cannot be fully controlled.
Les dispositifs précédents sont souvent accompagnés par des systèmes horlogers ou par des systèmes faisant appel à l'écoulement d'un fluide ou de billes, jouant le rôle de retardateur. L'inconvénient des systèmes horlogers réside principalement dans leur encombrement très important et dans leur grande sensibilité aux poussières. Quant aux systèmes par écoulement, les liquides posent le problème de la viscosité en fonction de la température et l'air celui de l'humidité qui conduit à la formation de givre obstruant les orifices. Enfin, avec les billes, on a un frottement solide favorisant la dispersion.The foregoing devices are often accompanied by watch systems or by systems calling upon the flow of a fluid or balls, playing the role of retarder. The drawback of watchmaking systems lies mainly in their very large dimensions and in their great sensitivity to dust. As for flow systems, liquids pose the problem of viscosity as a function of temperature and air that of humidity which leads to the formation of frost obstructing the orifices. Finally, with the balls, there is a solid friction favoring the dispersion.
Le but de la présente invention est de fournir un dispositif de sécurité utilisable dans les engins explosifs du type mine, missile ou roquette lancé à l'aide d'un tube monté par exemple sur un hélicoptère.The object of the present invention is to provide a safety device usable in explosive devices of the type mine, missile or rocket launched using a tube mounted for example on a helicopter.
L'invention a donc pour objet un dispositif de sécurité pour un engin explosif du type mine roquette ou missile, lancé à partir d'un tube comprenant notamment un volet de sécurité maintenu parun premier moyen de verrouillage dont l'effacement est interdit par un moyen de blocage, caractérisé en ce qu'il comporte un second moyen de verrouillage du volet, indexé sur le tube et un moyen de verrouillage intermédiaire du déplacement du second moyen de verrouillage coopérant avec le moyen de blocage, d'une part, et un ressort à mémoire de forme dont le changement de caractéristiques mécaniques commande l'effacement du moyen de blocage.The invention therefore relates to a safety device for an explosive device of the rocket or missile mine type, launched from a tube comprising in particular a safety flap held by a first locking means the erasure of which is prohibited by a means blocking device, characterized in that it comprises a second means for locking the flap, indexed on the tube and an intermediate locking means for the movement of the second locking means cooperating with the locking means, on the one hand, and a spring with shape memory, the change of mechanical characteristics of which clears the blocking means.
Un résultat de la présente invention réside dans son faible encombrement permettant une miniaturisation.A result of the present invention lies in its small footprint allowing miniaturization.
Un autre résultat réside dans le fait que le système demande une énergie suffisamment importante pour conserver un niveau de sécurité suffisant et procure des efforts compatibles avec le reste de la sécurité.Another result resides in the fact that the system requires sufficient energy to maintain a sufficient level of security and provides efforts compatible with the rest of the security.
Un autre résultat réside dans le fait que le dispositif selon l'invention remplace le détecteur d'ordre d'éjection et le retard d'armement. En effet, le ressort, par son allongement et sa rétraction avec retard, joue un double rôle.Another result lies in the fact that the device according to the invention replaces the ejection order detector and the arming delay. Indeed, the spring, by its elongation and its retraction with delay, plays a double role.
L'invention fait donc application de l'effet de mémoire de forme par activation qu possèdent certains alliages dont le plus courant est un alliage nickel-titane (50/50), cuivre-zinc -aluminium/cuivre-aluminium-nickel ou or-argent- platine. Un alliage à mémoire de forme est un alliage qui, ayant subi une déformation, retrouve sa forme initiale dès que sa température augmente sous l'effet du passage d'un courant électrique. Cet effet est différent de celui d'un bilame car il ne se produit qu'à une température particulière qui est choisie lors de sa définition et ne retrouve pas sa forme antérieure à moins de subir une nouvelle déformation mécanique. Cet effet résulte d'une transformation martensique réversible, c'est à dire une modification de la structure cristalline. Pour posséder une mémoire de forme, l'alliage doit subir une transformation austénite-martensite réversible de sa structure cristalline. Cette transformation, qui se produit sans diffusion, consiste dans le passage de la structure dite austénitique dans la phase haute température en structure cristalline différente dite martensique par refroidissement de l'alliage. Beaucoup d'alliages présentent une transformation martensique mais les alliages à mémoire de forme possèdent une structure martensique extrêmement symétrique. Ceux-ci possèdent une structure cubique centrée typique en phase austénitique et une structure hautement maclée en phase martensique. Cette structure maclée permet à l'alliage d'absorber des changements de forme significatifs et de retrouver la forme initiale lors du retour à la structure austénitique. Tout ceci est bien connu de l'homme de l'art et on peut utiliser dans l'invention un ressort à mémoire de forme vendu dans le commerce ou adapter ses caractéristiques en fonction des utilisations techniques ou suivant le type d'engin explosif. En règle générale, on détermine la force due à la mémoire de forme en partant de la force que peut exercer un ressort suivant la loi de Hocke avant les caractéristiques de l'alliage Ni-Ti austénitique. La course correspondante est déterminée en considérant le module de cet alliage martensique et la force obtenue à partir de la forme austénitique.The invention therefore makes use of the shape memory effect by activation that certain alloys have, the most common of which is a nickel-titanium alloy (50/50), copper-zinc -aluminum / copper-aluminum-nickel or gold- silver- platinum. A shape memory alloy is an alloy which, having undergone deformation, regains its initial shape as soon as its temperature increases under the effect of the passage of an electric current. This effect is different from that of a bimetallic strip because it only occurs at a particular temperature which is chosen during its definition and does not regain its previous form unless it is subjected to a new mechanical deformation. This effect results from a reversible martensic transformation, that is to say a modification of the crystal structure. To have a shape memory, the alloy must undergo a transformation reversible austenite-martensite of its crystal structure. This transformation, which occurs without diffusion, consists in the passage of the so-called austenitic structure in the high temperature phase into a different crystalline structure called martensic by cooling the alloy. Many alloys have a martensic transformation, but shape memory alloys have an extremely symmetrical martensic structure. These have a typical centered cubic structure in the austenitic phase and a highly twinned structure in the martensic phase. This twin structure allows the alloy to absorb significant shape changes and return to the initial shape when returning to the austenitic structure. All this is well known to those skilled in the art and it is possible to use in the invention a shape memory spring commercially available or to adapt its characteristics according to technical uses or according to the type of explosive device. As a general rule, the force due to shape memory is determined by starting from the force which a spring can exert according to Hocke's law before the characteristics of the austenitic Ni-Ti alloy. The corresponding stroke is determined by considering the modulus of this martensic alloy and the force obtained from the austenitic form.
A titre d'illustration, on peut utiliser dans l'invention un ressort hélicoïdal à mémoire de forme ayant les caractéristiques suivantes :
- - la figure 1 illustre un exemple de réalisation selon une coupe transversale du dispositif de sécurité.
- - la figure 2 est une coupe selon A-A de la fig.1.
- - les figures 3, 4 et 5 illustrent le fonctionnement du dispositif
- - la figure 6 représente un autre exemple de réalisation selon une coupe transversale du dispositif de sécurité.
- - Figure 1 illustrates an exemplary embodiment in a cross section of the safety device.
- - Figure 2 is a section along AA of fig.1.
- - Figures 3, 4 and 5 illustrate the operation of the device
- - Figure 6 shows another embodiment according to a cross section of the safety device.
On a représenté sur la fig.1 une coupe d'un projectile 1 au niveau d'un volet de sécurité 2, à l'intérieur d'un tube de lancement 3. Bien entendu, le volet fait partie d'une chaîne pyrotechnique représentée à la fig.2, de type tout à fait classique. Le volet 2 est maintenu immobile par deux verrous 4 et 5 intégrés dans les logements respectifs 6 et 7 pratiqués dans le corps du projectile. Le verrou comprend un corps 4a dont le diamètre externe correspond au diamètre interne du logement 6, prolongé par des portées tronconiques sur une desquelles prend appui une bille 8 constituant le moyen de blocage. Le corps 4a est prolongé du côté de volet 2 par une tige 4b s'engageant dans un percement 9 du volet, le diamètre externe de cette extrémité étant inférieur à celui du corps. Un ressort hélicoïdal 10 est disposé autour de l'extrémité 4b entre le corps 4a et un épaulement 11 du logement 6. L'autre extrémité 4c du corps est soumise à l'action d'un ressort 12 à mémoire de forme prenant appui sur une plaque 13.There is shown in fig.1 a section of a
Le verrou 5 est engagé à une extrémité dans un percement 14 du volet et prend appui à l'autre extrémité sur le tube 3 de lancement. Le verrou 5 comporte au voisinage du volet 2 un percement radial ou une gorge 15, dont la coopération avec le moyen de verrouillage intermédiaire sera expliqué ci-après, l'autre extrémité étant en appui sur le tube 3. A l'intérieur du logement 7, le verrou 5 est muni d'un épaulement 16. Un ressort hélicoïdal 17 est disposé entre l'épaulement 16 et une butée 18 du logement 7 et assure, après éjection de l'engin, la libération du volet 2 par le verrou 5. Sur la figure, on voit que le verrou 5 est disposé perpendiculairement au verrou 4.The
Le moyen de verrouillage intermédiaire, représenté par le verrou 19, est disposé parallèlement au verrou 4 dans un logement 20a, dans lequel il coulisse et vient s'appuyer sur une butée 20b. Ce verrou 19 comprend un corps 19a et un doigt cylindrique 19b ; le corps 19a est constitué d'une partie tronconique en appui sur la bille 8 et d'une partie cylindrique dont le diamètre externe correspond au diamètre interne du logement 20a. Cette partie cylindrique est munie d'une rainure circulaire 21 destinée à coopérer avec la bille 8. Un ressort 22 est disposé autour du doigt 19b et prend appui sur le corps 19a et sur un épaulement 23 du logement 20. Le doigt 19b s'engage dans le percement radial 15 du verrou 5 de façon à interdire sa translation éventuelle.The intermediate locking means, represented by the
La fig. 2 montre une coupe A-A selon la fig. 1 où on voit le volet 2, le percement 9, les verrous 5 et 10 et les éléments pyrotechniques adjacents au volet. Ces éléments sont par exemple constitués en amont du volet 2, de l'amorce 24 initiée électriquement par exemple et en aval par le relais 25 d'amorçage. L'alignement de la chaîne pyrotechniqe est réalisé par translation ou rotation du volet 2 dans lequel est inséré un relais 26. Ainsi, le relais 26 est aligné avec l'amorce 24 et le relais 25 ce qui assure la transmission de la détonation.Fig. 2 shows a section A-A according to FIG. 1 where we see the
Le fonctionnement du dispositif est illustré sur les fig. 3, 4 et 5. Préalablement un lancement de l'engin 1, le ressort 12 est alimenté sous une tension U (fig. 3) ce qui a pour effet d'élever sa température au-dessus du seuil provoquant son changement de caractéristiques. L'allongement de ce ressort provoque la translation du verrou 4 et la compression du ressort 10. La bille 8 peut alors s'effacer sous l'action du verrou intermédiaire 19 actionné par le ressort 22. Le verrou 5 est alors libéré mais reste immobile tant que l'engin 1 reste dans le tube 3.The operation of the device is illustrated in FIGS. 3, 4 and 5. Before launching the
Après éjection de l'engin explosif 1 (fig. 4), le ressort 17 provoque la translation du verrou 5 et libère l'écran 2. La course du verrou 19 étant calculée de telle façon que la bille 8 puisse s'effacer dans l'encoche 21 du verrou 19. La tension U disparaît alors et le ressort 12 perd après un certain temps de refroidissement ses caractéristiques mécaniques. Le ressort 12 ne s'oppose plus à l'action contraire du ressort 10 (fig. 5) et la translation du verrou 4 provoque l'effacement total de la bille 8 dans l'encoche 21. Le déverrouillage définitif de l'écran 2 est ainsi réalisé et la translation ou de rotation de celui-ci peut intervenir, sous l'effet d'un ressort non représenté, pour aligner la chaîne pyrotechnique.After ejection of the explosive device 1 (fig. 4), the
Dans le mode de réalisation représenté sur la fig. 6, les éléments identiques sont désignés par les mêmes références. On retrouve les verrous 4, 5 et 19 coulissant dans leurs logements respectifs 6, 7, 20, le volet 2, les ressorts 11, 12 et 17, la bille 8. Dans cette configuration, le ressort 12 n'est plus appliqué au verrou 4 mais au verrou intermédiaire 19.In the embodiment shown in FIG. 6, identical elements are designated by the same references. We find the
Le volet comporte alors une première empreinte 27 dans laquelle est placée une bille 28 maintenue en place par le verrou 4 dont le dégagement est interdit par la bille 8, coopérant avec la portée conique 29 de ce verrou et une seconde empreinte 30 dans laquelle est placée une bille 31 maintenue en place par le verrou 5 en appui sur le tube de lancement.The flap then comprises a
Le verrou 19 est constitué d'un corps 32 présentant un percement longitudinal borgne 33 à l'intérieur duquel coulisse un axe 34 muni d'une butée 35. Le corps 32 est terminé par une griffe 36 d'accrochage du ressort 12, et comporte un épaulement interne 37. Un ressort hélicoïdal 38 est placé autour de l'axe 34 entre la butée 35 et l'épaulement 37. Le corps comporte également une gorge externe 21 destinée à coopérer avec la bille 8. Le ressort 12 à mémoire de forme est relié à une source d'alimentation électrique 39 délivrant le courant nécessaire à son chauffage.The
Le fonctionnement est le suivant. Préalablement au lancement de l'engin explosif 1, le ressort 12 est alimenté sous une tension U, ce qui a pour effet d'élever sa température audessus du seuil provoquant son changement de caractéristiques. Le ressort 12 se comprime et provoque la translation du corps 32 comprimant le ressort 38. Le verrou 5 est alors libéré. Après le lancement de l'engin, le verrou n'est plus maintenu par le tube 3 et le ressort 17 agit en libérant la bille 31.The operation is as follows. Prior to the launch of the
Au bout d'un temps prédéterminé, l'alimentation du ressort 12 est coupée ce qui entraîne la disparition de ses caractéristiques mécaniques antérieures. Le ressort 38 peut alors entrer en action ce qui provoque la translation du corps 32 jusqu'à ce que la gorge 21 arrive au niveau de la bille 8.After a predetermined time, the supply of the
La bille 8 est alors chassée dans la gorge 21 par la portée conique 29 du verrou 4 sous l'effet du ressort 11. La bille 28 est alors libérée et le volet 2 peut être actionné de façon classique soit par translation soit par rotation pour aligner la chaîne pyrotechnique comme décrit en relation avec la fig. 2.The
Claims (10)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8508183A FR2582799B1 (en) | 1985-05-31 | 1985-05-31 | SAFETY FOR EXPLOSIVE DEVICES TO BE LAUNCHED FROM A TUBE |
FR8508183 | 1985-05-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0207822A1 true EP0207822A1 (en) | 1987-01-07 |
EP0207822B1 EP0207822B1 (en) | 1989-07-12 |
Family
ID=9319719
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86401088A Expired EP0207822B1 (en) | 1985-05-31 | 1986-05-23 | Safety device for an explosive projectile to be launched from a barrel |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0207822B1 (en) |
DE (1) | DE3664380D1 (en) |
FR (1) | FR2582799B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2661725A1 (en) * | 1990-05-03 | 1991-11-08 | Saint Louis Inst | DEVICE FOR SEPARATING TWO SPACES IN THE EVENT OF A TEMPERATURE RISING, METHOD FOR PRODUCING THIS DEVICE AND AMMUNITION COMPRISING SUCH A DEVICE. |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2707753B1 (en) * | 1993-06-28 | 1995-09-22 | Giat Ind Sa | Security and arming device for explosive device. |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2352242A (en) * | 1941-02-14 | 1944-06-27 | Apstein Maurice | Potential recording marker |
US2750888A (en) * | 1946-11-13 | 1956-06-19 | Robert O Wynn | Long delay bomb tail fuze |
US2974484A (en) * | 1952-01-23 | 1961-03-14 | Robert A Cooley | Ignition system for rocket motors |
FR2509037A1 (en) * | 1981-07-03 | 1983-01-07 | Diehl Gmbh & Co | SAFETY DEVICE FOR PROJECTILE ROCKET |
DE3126288A1 (en) * | 1981-07-03 | 1983-05-26 | Diehl GmbH & Co, 8500 Nürnberg | Safety device for projectile fuzes |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3352242A (en) * | 1963-11-29 | 1967-11-14 | Charles E Mcfann | Thermally initiated pyrotechnic delay time fuze |
-
1985
- 1985-05-31 FR FR8508183A patent/FR2582799B1/en not_active Expired
-
1986
- 1986-05-23 DE DE8686401088T patent/DE3664380D1/en not_active Expired
- 1986-05-23 EP EP86401088A patent/EP0207822B1/en not_active Expired
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2352242A (en) * | 1941-02-14 | 1944-06-27 | Apstein Maurice | Potential recording marker |
US2750888A (en) * | 1946-11-13 | 1956-06-19 | Robert O Wynn | Long delay bomb tail fuze |
US2974484A (en) * | 1952-01-23 | 1961-03-14 | Robert A Cooley | Ignition system for rocket motors |
FR2509037A1 (en) * | 1981-07-03 | 1983-01-07 | Diehl Gmbh & Co | SAFETY DEVICE FOR PROJECTILE ROCKET |
DE3126288A1 (en) * | 1981-07-03 | 1983-05-26 | Diehl GmbH & Co, 8500 Nürnberg | Safety device for projectile fuzes |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2661725A1 (en) * | 1990-05-03 | 1991-11-08 | Saint Louis Inst | DEVICE FOR SEPARATING TWO SPACES IN THE EVENT OF A TEMPERATURE RISING, METHOD FOR PRODUCING THIS DEVICE AND AMMUNITION COMPRISING SUCH A DEVICE. |
Also Published As
Publication number | Publication date |
---|---|
FR2582799A1 (en) | 1986-12-05 |
DE3664380D1 (en) | 1989-08-17 |
EP0207822B1 (en) | 1989-07-12 |
FR2582799B1 (en) | 1987-11-13 |
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