EP1355120B1 - Device for provisionally connecting and pyrotechnically separating two elements, with no rupture - Google Patents

Device for provisionally connecting and pyrotechnically separating two elements, with no rupture Download PDF

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Publication number
EP1355120B1
EP1355120B1 EP03101062A EP03101062A EP1355120B1 EP 1355120 B1 EP1355120 B1 EP 1355120B1 EP 03101062 A EP03101062 A EP 03101062A EP 03101062 A EP03101062 A EP 03101062A EP 1355120 B1 EP1355120 B1 EP 1355120B1
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EP
European Patent Office
Prior art keywords
elements
connecting part
face
pyrotechnic
heel
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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.)
Expired - Lifetime
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EP03101062A
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German (de)
French (fr)
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EP1355120A1 (en
Inventor
Patrick Comtesse
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EADS Space Transportation SA
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EADS Space Transportation SA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B15/00—Self-propelled projectiles or missiles, e.g. rockets; Guided missiles
    • F42B15/36—Means for interconnecting rocket-motor and body section; Multi-stage connectors; Disconnecting means
    • F42B15/38—Ring-shaped explosive elements for the separation of rocket parts

Definitions

  • the invention relates to a device capable of providing a temporary connection between two elements and using a pyrotechnic expansion tube to separate these elements, without the need to break any part.
  • Such a device can in particular be used in the aerospace industry, to control in a very short time the separation of two structural elements, while ensuring the possible transmission of significant forces between these two elements, before the break is performed .
  • Pyrotechnic separation devices generally comprise a pyrotechnic expansion tube, that is to say a sealed and deformable metal tube, in which circulates a detonating cord.
  • a flexible material such as rubber is interposed between the detonating cord and the tube which surrounds it.
  • the tube Before firing, the tube has an oblong cross-section, for example in the form of an ellipse or a flattened circle.
  • the shock wave that propagates at a very high speed along the tube deforms it and tends to give it a circular section.
  • the pyrotechnic expansion tube is used to cut one of the two elements along a given cutting line, in order to separate the two elements from one another.
  • US-A-3 362 290 describes an arrangement very similar to that which is the subject of documents FR-A-2 598 796 and EP-A-0 273 061.
  • the firing of the detonating cord causes, in this case, the shear rivets used to assemble the two elements, before their separation.
  • the rivets are hollow and of small diameter.
  • the preamble of claim 1 is based on JP-A-56002300.
  • This document describes, with reference to FIGS. 1 to 4, a device providing the temporary end-to-end connection of two cylindrical elements, by interlocking an L-shaped part of one of the elements between one end of the other element and one connecting piece fixed to this denier by rivets. The separation is ensured by the firing of an annular tube with pyrotechnic expansion, housed between the L-shaped part of the first element, the end of the other element and the connecting piece, because of the spacing of these elements. last.
  • the object of the invention is to provide a pyrotechnic separation device whose original design enables it to separate elements made of any materials, in particular metallic materials, without causing any part to break.
  • This arrangement makes it possible to separate the two elements without any piece breakage. This eliminates any risk that a fragment released during the breakage will damage equipment located near the junction area.
  • the connecting piece advantageously comprises a plurality of active parts made in one piece with the base portion and able to deform away from said face, during a setting. of the pyrotechnic expansion tube.
  • the two elements may be annular and arranged end to end or constituted by panels arranged end to end.
  • the connecting piece encircles the junction zone.
  • the connecting piece overlaps the junction zone.
  • FIGS. 1 to 3 show a preferred embodiment of a device 10 for temporary connection and pyrotechnic separation, placed between a first element 12 and a second element 14.
  • the first element 12 and the second element 14 are advantageously constituted either as two annular elements, of substantially the same diameter, or by two panels of any shape. In both cases, the elements 12 and 14 are designed to be assembled end to end.
  • the device 10 according to the invention is located in the connection zone between the two elements 12 and 14. It mainly comprises a pyrotechnic expansion pipe 16 of conventional design, as well as a connecting piece 18.
  • the pyrotechnic expansion tube 16 is housed in a space 20 which is formed in the first member 12 and opens on a face 22 thereof. More specifically, the space 20 is materialized by a groove of rectangular section and the pyrotechnic expansion tube 16 is flush with the face 22 of the first element 12 when it is placed inside said groove.
  • the first element 12 At its end located beyond the space 20, the first element 12 comprises a cavity 24 whose function will appear thereafter.
  • This footprint 24 is delimited in this case by a flank perpendicular to the face 22 of the first element 12 and opening on said face, and by a flank parallel to the face 22.
  • the face 22 of the first element 12 comprises a recessed portion connected, by an inclined surface 26, to the part of said face in which the space is formed. 20.
  • the second element 14 comprises, at its end intended to be assembled to the first element 12, a heel 32.
  • This heel 32 is provided to bear against the cavity 24 formed at the end of the first element 12.
  • it has surfaces complementary to those which delimit the footprint 24.
  • the heel 32 of the second element 14 further comprises a notch 36, on its face 34 intended to be turned on the same side as the face 22 of the first element 12.
  • the notch 36 has the shape of a groove rectangular section.
  • the connecting piece 18 comprises a base part 38, as well as at least one and preferably several active parts 40.
  • the active parts 40 are made in one piece with the base part 38. They are designed to be able to deform when subjected to the force generated by the firing of the detonating cord contained in the pyrotechnic expansion tube 16.
  • the base portion 38 is provided to be fixed on the face 22 of the first member 12 using the aforementioned fastening means.
  • the base portion is traversed by holes 42 which are substantially aligned with the holes 28 when the connecting piece 18 is put in place.
  • the screws 30 are then introduced into the holes 28 and 42 aligned.
  • the nuts 44 are then screwed onto the screws 30 to complete the fastening means.
  • the face 46 of the connecting piece 18 intended to be applied on the face 22 of the first member 12 has a shape complementary to that of said face 22.
  • this face 26 of the connecting piece 18 comprises an inclined surface 48 complementary to the inclined surface 26 of the face 22.
  • the inclined surfaces 26 and 48 thus form complementary surfaces with a wedge effect, the arrangement of which is such that the connecting piece 18 is moved slightly downwards by considering the figures, during the tightening of the bolts formed by the screws 30 and the nuts 44, said bolts embodying the fastening means of the connecting piece 18 on the first element 12.
  • the active parts 40 extend the base portion 38 of the connecting piece 18 so as to extend beyond the cavity 24 formed at the end of the first element 12, when the connecting piece 18 is fixed on the -this.
  • Each of the active parts 40 comprises a hook-shaped end 50.
  • the cooperation of the wedge-shaped complementary surfaces 26, 48 has the effect, during the tightening of the bolts 30, 44, to slightly move each of the ends 50 folded hook-shaped towards said bolts.
  • the inner face of ends 50 thus bears against the edge of the notch 36 closest to the end of the heel 32. This has the effect of pressing the heel 32 against the cavity 24, so as to establish a pressure connection between the first element 12 and the second element 14.
  • FIG. 2 This arrangement obtained after assembly of the elements 12 and 14 by the connecting pieces 18 and the fastening means 30, 44 is illustrated in FIG. 2. It makes it possible to establish a temporary connection between the different parts and constitutes a "normal" state. assembly.
  • the detonating cord contained in the pyrotechnic expansion tube 16 is ignited. This is translated conventionally by a swelling of the tube 16, under the effect of the gases released by the firing. The initially flat section of the pyrotechnic expansion tube 16 then becomes pseudo-circular, as illustrated in FIG.
  • the swelling of the pyrotechnic expansion tube 16 has the effect of folding the active parts 40 of the connecting piece 18 around their connection zones with the base part 38 of this part, away from the first element 12. This is made possible by the rigid nature of the part of the element 12 in which the space 20 is machined and by the deformable nature of the active parts 40.
  • the active parts 40 of the connecting piece 18 then open, in a very short time, in the manner of the petals of a flower. This has the effect of completely disengage the ends 50 in the form of hooks of the notch 36 formed in the heel 32. The mechanical connection between the elements 12 and 14 is thus removed. These elements can therefore separate from each other, as shown in Figure 3.
  • the elements 12 and 14 may be of annular shapes, or consist of flat panels or any other form.
  • the connecting piece 18 encircles the connection zone between the two elements and the active parts 40 are distributed over its entire circumference.
  • the connecting piece 18 overlaps the junction zone of the two panels.
  • the fixing means can take different forms (rivets, screws, etc.).
  • the pyrotechnic expansion tube 16 can also be mounted in a machined space in the heel 32 of the second piece 14, between the end of the heel and the notch 36.

Description

Domaine techniqueTechnical area

L'invention concerne un dispositif apte à assurer une liaison provisoire entre deux éléments et utilisant un tube à expansion pyrotechnique pour séparer ces éléments, sans nécessiter la rupture d'une pièce quelconque.The invention relates to a device capable of providing a temporary connection between two elements and using a pyrotechnic expansion tube to separate these elements, without the need to break any part.

Un tel dispositif peut notamment être utilisé dans les industries aéronautique et spatiale, pour commander en un temps très bref la séparation de deux éléments structurels, tout en assurant la transmission éventuelle d'efforts importants entre ces deux éléments, avant que la rupture ne soit effectuée.Such a device can in particular be used in the aerospace industry, to control in a very short time the separation of two structural elements, while ensuring the possible transmission of significant forces between these two elements, before the break is performed .

Etat de la techniqueState of the art

Lorsque deux éléments entre lesquels passent des efforts doivent être séparés de façon irréversible, en un temps très bref, au moyen d'une commande à distance, on utilise couramment des dispositifs de séparation pyrotechnique intégrés dans la zone de jonction entre les deux éléments.When two elements between which forces pass must be irreversibly separated, in a very short time, by means of a remote control, pyrotechnic separation devices integrated in the junction zone between the two elements are commonly used.

Les dispositifs de séparation pyrotechnique comprennent généralement un tube à expansion pyrotechnique, c'est-à-dire un tube métallique étanche et déformable, dans lequel circule un cordeau détonant. Un matériau souple tel que du caoutchouc est interposé entre le cordeau détonant et le tube qui l'enveloppe. Avant la mise à feu, le tube présente une section oblongue, par exemple en forme d'ellipse ou de cercle aplati.Pyrotechnic separation devices generally comprise a pyrotechnic expansion tube, that is to say a sealed and deformable metal tube, in which circulates a detonating cord. A flexible material such as rubber is interposed between the detonating cord and the tube which surrounds it. Before firing, the tube has an oblong cross-section, for example in the form of an ellipse or a flattened circle.

Lorsque le cordeau détonant est mis à feu, l'onde de choc qui se propage à très grande vitesse le long du tube déforme celui-ci et tend à lui donner une section circulaire.When the detonating cord is fired, the shock wave that propagates at a very high speed along the tube deforms it and tends to give it a circular section.

Dans les dispositifs de séparation pyrotechnique existants, le tube à expansion pyrotechnique est utilisé pour découper l'un des deux éléments selon une ligne de découpe donnée, afin de séparer les deux éléments l'un de l'autre.In existing pyrotechnic separation devices, the pyrotechnic expansion tube is used to cut one of the two elements along a given cutting line, in order to separate the two elements from one another.

Dans le cas où les éléments à séparer sont métalliques, il est connu de loger le tube à expansion pyrotechnique dans le fond d'un évidement à section en forme de U pratiqué dans l'un de ces éléments. L'autre élément est alors fixé dans l'entrée de cet évidement, par exemple au moyen de boulons ou analogues. La mise à feu du cordeau détonant provoque la cassure des deux branches latérales de l'élément évidé, selon des lignes définies par des zones d'épaisseur réduite. Les documents FR-A-2 598 796 et EP-A-0 273 061 illustrent des dispositifs de ce type.In the case where the elements to be separated are metallic, it is known to house the pyrotechnic expansion tube in the bottom of a U-shaped recess cut in one of these elements. The other element is then fixed in the inlet of this recess, for example by means of bolts or the like. The firing of the detonating cord causes the breaking of the two lateral branches of the hollow element, along lines defined by areas of reduced thickness. Documents FR-A-2 598 796 and EP-A-0 273 061 illustrate devices of this type.

Il est également connu, comme l'illustre le document US-A-4 137 848, de loger le tube à expansion pyrotechnique entre deux parties en vis-à-vis des éléments métalliques à séparer, en donnant à l'une desdites parties une épaisseur réduite. Les deux éléments sont reliés l'un à l'autre par des coulons ou analogues, d'un côté du tube et à proximité de celui-ci. La mise à feu du cordeau détonant provoque la cassure de la partie d'épaisseur réduite.It is also known, as illustrated in US-A-4 137 848, to house the pyrotechnic expansion tube between two parts opposite the metal elements to be separated, by giving one of said parts a reduced thickness. The two elements are connected to each other by coulons or the like, on one side of the tube and close to it. The firing of the detonating cord causes the breakage of the part of reduced thickness.

Le document US-A-3 362 290 décrit un agencement très proche de celui qui fait l'objet des documents FR-A-2 598 796 et EP-A-0 273 061. Toutefois, au lieu de provoquer la cassure de l'élément, évidé, la mise à feu du cordeau détonant provoque, dans ce cas, le cisaillement des rivets servant à assembler les deux éléments, avant leur séparation. A cet effet, les rivets sont creux et de petit diamètre.US-A-3 362 290 describes an arrangement very similar to that which is the subject of documents FR-A-2 598 796 and EP-A-0 273 061. However, instead of causing the breakage of the element, hollowed out, the firing of the detonating cord causes, in this case, the shear rivets used to assemble the two elements, before their separation. For this purpose, the rivets are hollow and of small diameter.

Lorsque les éléments à séparer sont des structures de type sandwich, il a été proposé de loger le tube à expansion pyrotechnique dans une partie de ces structures dépourvue d'âme alvéolaire. La mise à feu du cordeau détonant a alors pour effet de découper les parties du revêtement de la structure situées en face dudit tube. Des agencements de ce type sont décrits dans les documents FR-A-2 779 223 et FR-A-2 779 224.When the elements to be separated are sandwich-type structures, it has been proposed to house the pyrotechnic expansion tube in a part of these structures devoid of a cellular core. The firing of the detonating cord then has the effect of cutting the parts of the coating of the structure located opposite said tube. Arrangements of this type are described in FR-A-2 779 223 and FR-A-2 779 224.

Dans le document FR-A-2 779 222, il est décrit un agencement comparable, dans lequel les deux éléments sont reliés initialement l'un à l'autre par au moins une pièce de liaison collée. Lors de la mise à feu, l'expansion du tube provoque le décollement de la pièce de liaison et la séparation des deux éléments.In document FR-A-2 779 222 a comparable arrangement is described in which the two elements are initially connected to one another by at least one bonded connection piece. When firing, expansion of the tube causes the detachment of the connecting piece and the separation of the two elements.

En résumé, tous les dispositifs connus de séparation pyrotechnique associés à des pièces métalliques réalisent la séparation desdites pièces en commandant la rupture de l'une d'entre elles ou le cisaillement des organes qui en assurent l'assemblage. Il en est généralement de même dans le cas des dispositifs associés à des pièces en matériaux composites.In summary, all known pyrotechnic separation devices associated with metal parts perform the separation of said parts by controlling the breaking of one of them or the shearing of the members that assemble. It is generally the same in the case of devices associated with parts made of composite materials.

La seule exception concerne le cas du dispositif décrit dans le document FR-A-2 779 222, dans lequel la découpe de l'un des deux éléments est remplacée par le décollement d'une pièce de liaison collée. Toutefois, ce type de dispositif ne peut être utilisé que pour relier des éléments en matériaux composites.The only exception concerns the case of the device described in document FR-A-2 779 222, in which the cutting of one of the two elements is replaced by the separation of a bonded connection piece. However, this type of device can only be used to connect elements made of composite materials.

Le préambule de la revendications 1 est fondé sur le document JP-A-56002300. Ce document décrit, en référence aux figures 1 à 4, un dispositif assurant la liaison provisoire bout à bout de deux éléments cylindriques, par emboîtement d'une partie en L de l'un des éléments entre une extrémité de l'autre élément et une pièce de liaison fixée à ce denier par des rivets. La séparation est assurée par la mise à feu d'un tube annulaire à expansion pyrotechnique, logé entre la partie en L du premier élément, l'extrémité de l'autre élément et la pièce de liaison, du fait de l'écartement de ces derniers.The preamble of claim 1 is based on JP-A-56002300. This document describes, with reference to FIGS. 1 to 4, a device providing the temporary end-to-end connection of two cylindrical elements, by interlocking an L-shaped part of one of the elements between one end of the other element and one connecting piece fixed to this denier by rivets. The separation is ensured by the firing of an annular tube with pyrotechnic expansion, housed between the L-shaped part of the first element, the end of the other element and the connecting piece, because of the spacing of these elements. last.

Exposé de l'inventionPresentation of the invention

L'invention a pour but la réalisation d'un dispositif de séparation pyrotechnique dont la conception originale lui permet de séparer des éléments en des matériaux quelconques, notamment métalliques, sans entraîner la rupture d'aucune pièce.The object of the invention is to provide a pyrotechnic separation device whose original design enables it to separate elements made of any materials, in particular metallic materials, without causing any part to break.

Conformément à l'invention, ce résultat est obtenu au moyen d'un dispositif de liaison provisoire et de séparation pyrotechnique conforme à la revendication 1.According to the invention, this result is obtained by means of a temporary connection device and pyrotechnic separation device according to claim 1.

Cet agencement permet de séparer les deux éléments sans aucune rupture de pièce. On supprime ainsi tout risque qu'un fragment libéré lors de la rupture vienne endommager des équipements situés à proximité de la zone de jonction.This arrangement makes it possible to separate the two elements without any piece breakage. This eliminates any risk that a fragment released during the breakage will damage equipment located near the junction area.

Dans le mode de réalisation préféré de l'invention, la pièce de liaison comporte avantageusement une pluralité de parties actives réalisées d'un seul tenant avec la partie de base et aptes à se déformer en éloignement de ladite face, lors d'une mise en oeuvre du tube à expansion pyrotechnique.In the preferred embodiment of the invention, the connecting piece advantageously comprises a plurality of active parts made in one piece with the base portion and able to deform away from said face, during a setting. of the pyrotechnic expansion tube.

Selon le cas, les deux éléments peuvent être annulaires et disposés bout à bout ou constitués par des panneaux disposés bout à bout. Dans le premier cas, la pièce de liaison encercle la zone de jonction. Dans le second cas, la pièce de liaison chevauche la zone de jonction.Depending on the case, the two elements may be annular and arranged end to end or constituted by panels arranged end to end. In the first case, the connecting piece encircles the junction zone. In the second case, the connecting piece overlaps the junction zone.

Brève description des dessinsBrief description of the drawings

On décrira à présent, à titre d'exemple illustratif et nullement limitatif, un mode de réalisation préféré de l'invention, en se référant aux dessins annexés, dans lesquels :

  • la figure 1 est une vue en coupe transversale qui représente un dispositif conforme à l'invention, avant l'assemblage des deux éléments ;
  • la figure 2 est une vue comparable à la figure 1, qui représente le dispositif assemblé ; et
  • la figure 3 est une vue comparable aux figures 1 et 2, qui représente le dispositif après la mise en oeuvre du tube à expansion pyrotechnique.
A preferred embodiment of the invention will now be described, by way of illustrative and non-limiting example, with reference to the accompanying drawings, in which:
  • Figure 1 is a cross-sectional view showing a device according to the invention, before the assembly of the two elements;
  • Figure 2 is a view comparable to Figure 1, which shows the assembled device; and
  • Figure 3 is a view comparable to Figures 1 and 2, which shows the device after the implementation of the pyrotechnic expansion tube.

Description détaillée d'un mode de réalisation préféré de l'inventionDETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION

On a représenté sur les figures 1 à 3 un mode de réalisation préféré d'un dispositif 10 de liaison provisoire et de séparation pyrotechnique, placé entre un premier élément 12 et un deuxième élément 14.FIGS. 1 to 3 show a preferred embodiment of a device 10 for temporary connection and pyrotechnic separation, placed between a first element 12 and a second element 14.

Le premier élément 12 et le deuxième élément 14 sont constitués avantageusement soit comme deux éléments annulaires, sensiblement de même diamètre, soit par deux panneaux de forme quelconque. Dans les deux cas, les éléments 12 et 14 sont prévus pour être assemblés bout à bout.The first element 12 and the second element 14 are advantageously constituted either as two annular elements, of substantially the same diameter, or by two panels of any shape. In both cases, the elements 12 and 14 are designed to be assembled end to end.

Le dispositif 10 conforme à l'invention est situé dans la zone de liaison entre les deux éléments 12 et 14. Il comprend principalement un tube à expansion pyrotechnique 16 de conception classique, ainsi qu'une pièce de liaison 18.The device 10 according to the invention is located in the connection zone between the two elements 12 and 14. It mainly comprises a pyrotechnic expansion pipe 16 of conventional design, as well as a connecting piece 18.

Comme on le voit bien sur la figure 1 qui représente les pièces avant leur assemblage, le tube à expansion pyrotechnique 16 est logé dans un espace 20 qui est formé dans le premier élément 12 et débouche sur une face 22 de celui-ci. Plus précisément, l'espace 20 est matérialisé par une gorge de section rectangulaire et le tube à expansion pyrotechnique 16 affleure la face 22 du premier élément 12 lorsqu'il est placé à l'intérieur de ladite gorge.As can be seen in Figure 1 which shows the parts before assembly, the pyrotechnic expansion tube 16 is housed in a space 20 which is formed in the first member 12 and opens on a face 22 thereof. More specifically, the space 20 is materialized by a groove of rectangular section and the pyrotechnic expansion tube 16 is flush with the face 22 of the first element 12 when it is placed inside said groove.

A son extrémité située au-delà de l'espace 20, le premier élément 12 comprend une empreinte 24 dont la fonction apparaîtra par la suite. Cette empreinte 24 est délimitée dans ce cas par un flanc perpendiculaire à la face 22 du premier élément 12 et débouchant sur ladite face, et par un flanc parallèle à la face 22.At its end located beyond the space 20, the first element 12 comprises a cavity 24 whose function will appear thereafter. This footprint 24 is delimited in this case by a flank perpendicular to the face 22 of the first element 12 and opening on said face, and by a flank parallel to the face 22.

A l'opposé de l'empreinte 24 par rapport à l'espace 20, la face 22 du premier élément 12 comporte une partie en creux reliée, par une surface inclinée 26, à la partie de ladite face dans laquelle est formé l'espace 20.Opposite the cavity 24 with respect to the space 20, the face 22 of the first element 12 comprises a recessed portion connected, by an inclined surface 26, to the part of said face in which the space is formed. 20.

A proximité de cette surface inclinée 26, la partie en creux de la face 22 du premier élément 12 est traversée par des trous 28 destinés au passage d'organes de fixation tels que des vis 30 associées à des écrous 44 et matérialisant des moyens de fixation de la pièce de liaison 18 sur la face 22 du premier élément 12.In the vicinity of this inclined surface 26, the hollow portion of the face 22 of the first element 12 is traversed by holes 28 for the passage of fasteners such as screws 30 associated with nuts 44 and embodying fastening means of the connecting piece 18 on the face 22 of the first element 12.

Le deuxième élément 14 comporte, à son extrémité prévue pour être assemblée au premier élément 12, un talon 32. Ce talon 32 est prévu pour venir en appui contre l'empreinte 24 formée à l'extrémité du premier élément 12. A cet effet, il présente des surfaces complémentaires de celles qui délimitent l'empreinte 24.The second element 14 comprises, at its end intended to be assembled to the first element 12, a heel 32. This heel 32 is provided to bear against the cavity 24 formed at the end of the first element 12. For this purpose, it has surfaces complementary to those which delimit the footprint 24.

Le talon 32 du deuxième élément 14 comprend de plus une encoche 36, sur sa face 34 prévue pour être tournée du même côté que la face 22 du premier élément 12. Dans ce cas, l'encoche 36 présente la forme d'une rainure de section rectangulaire.The heel 32 of the second element 14 further comprises a notch 36, on its face 34 intended to be turned on the same side as the face 22 of the first element 12. In this case, the notch 36 has the shape of a groove rectangular section.

La pièce de liaison 18 comprend une partie de base 38, ainsi qu'au moins une et de préférence plusieurs parties actives 40. Les parties actives 40 sont réalisées d'une seule pièce avec la partie de base 38. Elles sont prévues pour pouvoir se déformer lorsqu'elles sont soumises à l'effort engendré par la mise à feu du cordeau détonant contenu dans le tube à expansion pyrotechnique 16.The connecting piece 18 comprises a base part 38, as well as at least one and preferably several active parts 40. The active parts 40 are made in one piece with the base part 38. They are designed to be able to deform when subjected to the force generated by the firing of the detonating cord contained in the pyrotechnic expansion tube 16.

La partie de base 38 est prévue pour être fixée sur la face 22 du premier élément 12 à l'aide des moyens de fixation précités. A cet effet, la partie de base est traversée par des trous 42 qui sont sensiblement alignés avec les trous 28 lorsque la pièce de liaison 18 est mise en place. Les vis 30 sont alors introduites dans les trous 28 et 42 alignés. Les écrous 44 sont ensuite vissés sur les vis 30, pour compléter les moyens de fixation.The base portion 38 is provided to be fixed on the face 22 of the first member 12 using the aforementioned fastening means. For this purpose, the base portion is traversed by holes 42 which are substantially aligned with the holes 28 when the connecting piece 18 is put in place. The screws 30 are then introduced into the holes 28 and 42 aligned. The nuts 44 are then screwed onto the screws 30 to complete the fastening means.

La face 46 de la pièce de liaison 18 prévue pour être appliquée sur la face 22 du premier élément 12 a une forme complémentaire de celle de ladite face 22. Ainsi, cette face 26 de la pièce de liaison 18 comprend une surface inclinée 48 complémentaire de la surface inclinée 26 de la face 22.The face 46 of the connecting piece 18 intended to be applied on the face 22 of the first member 12 has a shape complementary to that of said face 22. Thus, this face 26 of the connecting piece 18 comprises an inclined surface 48 complementary to the inclined surface 26 of the face 22.

Les surfaces inclinées 26 et 48 forment ainsi des surfaces complémentaires à effet de coin, dont l'agencement est tel que la pièce de liaison 18 est déplacée légèrement vers le bas en considérant les figures, lors du serrage des boulons formés par les vis 30 et les écrous 44, lesdits boulons matérialisant les moyens de fixation de la pièce de liaison 18 sur le premier élément 12.The inclined surfaces 26 and 48 thus form complementary surfaces with a wedge effect, the arrangement of which is such that the connecting piece 18 is moved slightly downwards by considering the figures, during the tightening of the bolts formed by the screws 30 and the nuts 44, said bolts embodying the fastening means of the connecting piece 18 on the first element 12.

Les parties actives 40 prolongent la partie de base 38 de la pièce de liaison 18 de façon à s'étendre au-delà de l'empreinte 24 formée à l'extrémité du premier élément 12, lorsque la pièce de liaison 18 est fixée sur celui-ci.The active parts 40 extend the base portion 38 of the connecting piece 18 so as to extend beyond the cavity 24 formed at the end of the first element 12, when the connecting piece 18 is fixed on the -this.

Chacune des parties actives 40 comprend une extrémité 50 en forme de crochet. Lorsque la pièce de liaison est fixée sur le premier élément 12 et lorsque le talon 32 du deuxième élément 14 est en appui contre l'empreinte 24 du premier élément 12, l'extrémité 50 en forme de crochet est reçue dans l'encoche 36 formée dans le talon 32, comme l'illustre la figure 2.Each of the active parts 40 comprises a hook-shaped end 50. When the connecting piece is fixed on the first element 12 and when the heel 32 of the second element 14 bears against the cavity 24 of the first element 12, the end 50 in the form of a hook is received in the notch 36 formed in the heel 32, as shown in Figure 2.

Plus précisément, la coopération des surfaces complémentaires en forme de coin 26, 48 a pour effet, lors du serrage des boulons 30, 44, de déplacer légèrement chacune des extrémités 50 repliées en forme de crochet vers lesdits boulons. La face intérieure des extrémités 50 vient ainsi en appui contre le bord de l'encoche 36 le plus proche de l'extrémité du talon 32. Cela a pour effet de presser le talon 32 contre l'empreinte 24, de façon à établir une liaison par pression entre le premier élément 12 et le deuxième élément 14.Specifically, the cooperation of the wedge-shaped complementary surfaces 26, 48 has the effect, during the tightening of the bolts 30, 44, to slightly move each of the ends 50 folded hook-shaped towards said bolts. The inner face of ends 50 thus bears against the edge of the notch 36 closest to the end of the heel 32. This has the effect of pressing the heel 32 against the cavity 24, so as to establish a pressure connection between the first element 12 and the second element 14.

Cet agencement obtenu après assemblage des éléments 12 et 14 par les pièces de liaison 18 et les moyens de fixation 30, 44 est illustré sur la figure 2. Il permet d'établir une liaison provisoire entre les différentes pièces et constitue un état "normal" de l'assemblage.This arrangement obtained after assembly of the elements 12 and 14 by the connecting pieces 18 and the fastening means 30, 44 is illustrated in FIG. 2. It makes it possible to establish a temporary connection between the different parts and constitutes a "normal" state. assembly.

Lorsqu'on commande la séparation des éléments 12 et 14, le cordeau détonant contenu dans le tube 16 à expansion pyrotechnique est mis à feu. Cela se traduit de façon classique par un gonflement du tube 16, sous l'effet des gaz libérés par la mise à feu. La section initialement plate du tube 16 à expansion pyrotechnique devient alors pseudo circulaire, comme l'illustre la figure 3.When controlling the separation of the elements 12 and 14, the detonating cord contained in the pyrotechnic expansion tube 16 is ignited. This is translated conventionally by a swelling of the tube 16, under the effect of the gases released by the firing. The initially flat section of the pyrotechnic expansion tube 16 then becomes pseudo-circular, as illustrated in FIG.

Conformément à l'invention, le gonflement du tube 16 à expansion pyrotechnique a pour effet de plier les parties actives 40 de la pièce de liaison 18 autour de leurs zones de liaison avec la partie de base 38 de cette pièce, en éloignement du premier élément 12. Cela est rendu possible par le caractère rigide de la partie de l'élément 12 dans laquelle est usiné l'espace 20 et par le caractère déformable des parties actives 40.According to the invention, the swelling of the pyrotechnic expansion tube 16 has the effect of folding the active parts 40 of the connecting piece 18 around their connection zones with the base part 38 of this part, away from the first element 12. This is made possible by the rigid nature of the part of the element 12 in which the space 20 is machined and by the deformable nature of the active parts 40.

Les parties actives 40 de la pièce de liaison 18 s'ouvrent alors, en un temps très court, à la manière des pétales d'une fleur. Cela a pour effet de dégager complètement les extrémités 50 en forme de crochets de l'encoche 36 formée dans le talon 32. La liaison mécanique entre les éléments 12 et 14 est ainsi supprimée. Ces éléments peuvent donc se séparer l'un de l'autre, comme on l'a représenté sur la figure 3.The active parts 40 of the connecting piece 18 then open, in a very short time, in the manner of the petals of a flower. This has the effect of completely disengage the ends 50 in the form of hooks of the notch 36 formed in the heel 32. The mechanical connection between the elements 12 and 14 is thus removed. These elements can therefore separate from each other, as shown in Figure 3.

Bien entendu, l'invention n'est pas limitée au mode de réalisation qui vient d'être décrit à titre d'exemple. Ainsi, comme on l'a déjà observé, les éléments 12 et 14 peuvent être soit de formes annulaires, soit constitués par des panneaux plans ou de toute autre forme. Dans le premier cas, la pièce de liaison 18 encercle la zone de liaison entre les deux éléments et les parties actives 40 sont réparties sur toute sa circonférence. Dans le second cas, la pièce de liaison 18 chevauche la zone de jonction des deux panneaux. En outre, les moyens de fixation peuvent prendre des formes différentes (rivets, vis, etc.). Enfin, au lieu d'être logé dans un espace usiné dans le premier élément 12, le tube 16 à expansion pyrotechnique peut aussi être monté dans un espace usiné dans le talon 32 de la deuxième pièce 14, entre l'extrémité du talon et l'encoche 36.Of course, the invention is not limited to the embodiment which has just been described by way of example. Thus, as already observed, the elements 12 and 14 may be of annular shapes, or consist of flat panels or any other form. In the first case, the connecting piece 18 encircles the connection zone between the two elements and the active parts 40 are distributed over its entire circumference. In the second case, the connecting piece 18 overlaps the junction zone of the two panels. In addition, the fixing means can take different forms (rivets, screws, etc.). Finally, instead of being housed in a machined space in the first element 12, the pyrotechnic expansion tube 16 can also be mounted in a machined space in the heel 32 of the second piece 14, between the end of the heel and the notch 36.

Claims (5)

  1. Temporary connection and pyrotechnic separation device, comprising a pyrotechnic expansion tube (16) fitted in a space (20) formed in a connecting area between two elements (12, 14) to be separated, the said space (20) being delimited partly by a connecting part (18) fixed to a first (12) of the said elements, the said connecting part (18) normally forming a pressure connection between the said elements and capable of deforming during use of the pyrotechnic expansion tube (16) to release the said pressure connection, wherein the connecting part (18) comprises a bottom portion (38) fixed onto a face (22) of the first element (12) and at least one active portion (40), the end (50) of which can hold a heel of the second element (14) bearing on a complementary impression (24) formed on the first element (12), to form the said pressure connection, the said space (20) being formed in the first element (12) or in the heel (32) of the second element (14) and opening up onto the face of the active portion (40) of the connecting part (18) between the bottom portion (38) and the end (50) and wherein said end (50) of the active portion (40) of the connecting part (18) is hook-shaped, so that it normally fits into a notch (36) formed in the heel (32) of the second element (14), characterized in that the connecting part (18) and the said face (22) of the first element (12) cooperate with each other through complementary surfaces (26, 48) with a wedge effect capable of slightly moving the said hooked shape end (50) towards the bottom portion (38) when the attachment means (30, 44) of the said bottom portion are tightened on the bottom (22) of the first element (12).
  2. Device according to claim 1, wherein the attachment means are bolts (30, 44).
  3. Device according to either of claims 1 and 2, wherein the connecting part (18) is provided with several active portions (40) made in a single piece with the bottom part (38), and capable of deforming by moving away from the said face (22) when the pyrotechnic expansion tube (16) is used.
  4. Device according to any one of the previous claims, wherein the two elements (12, 14) are annular and are placed end to end, and the connecting part (18) surrounds their junction area.
  5. Device according to any one of claims 1 to 3, wherein the two elements (12, 14) are panels placed end to end and the connecting part (18) overlaps their junction area.
EP03101062A 2002-04-19 2003-04-17 Device for provisionally connecting and pyrotechnically separating two elements, with no rupture Expired - Lifetime EP1355120B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0204927 2002-04-19
FR0204927A FR2838818B1 (en) 2002-04-19 2002-04-19 DEVICE FOR PROVISIONAL BONDING AND PYROTECHNIC SEPARATION OF TWO ELEMENTS, WITHOUT BREAK

Publications (2)

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EP1355120A1 EP1355120A1 (en) 2003-10-22
EP1355120B1 true EP1355120B1 (en) 2006-06-21

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US (1) US20030196544A1 (en)
EP (1) EP1355120B1 (en)
JP (1) JP2003315000A (en)
DE (1) DE60306245T2 (en)
ES (1) ES2266724T3 (en)
FR (1) FR2838818B1 (en)

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Also Published As

Publication number Publication date
FR2838818B1 (en) 2006-12-08
ES2266724T3 (en) 2007-03-01
DE60306245T2 (en) 2007-05-03
JP2003315000A (en) 2003-11-06
EP1355120A1 (en) 2003-10-22
FR2838818A1 (en) 2003-10-24
US20030196544A1 (en) 2003-10-23
DE60306245D1 (en) 2006-08-03

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