EP1327850B1 - Electro-explosive initiator and method of manufacture - Google Patents

Electro-explosive initiator and method of manufacture Download PDF

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Publication number
EP1327850B1
EP1327850B1 EP02290061A EP02290061A EP1327850B1 EP 1327850 B1 EP1327850 B1 EP 1327850B1 EP 02290061 A EP02290061 A EP 02290061A EP 02290061 A EP02290061 A EP 02290061A EP 1327850 B1 EP1327850 B1 EP 1327850B1
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EP
European Patent Office
Prior art keywords
sub
assembly
initiator according
height
initiator
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.)
Expired - Lifetime
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EP02290061A
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German (de)
French (fr)
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EP1327850A1 (en
Inventor
Stéphane Phelep
Philippe Pinet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF Airbag Germany GmbH
Original Assignee
Davey Bickford SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to EP02290061A priority Critical patent/EP1327850B1/en
Application filed by Davey Bickford SAS filed Critical Davey Bickford SAS
Priority to AT02290061T priority patent/ATE326679T1/en
Priority to ES02290061T priority patent/ES2261605T3/en
Priority to DE60211462T priority patent/DE60211462T2/en
Priority to TW092100506A priority patent/TWI282403B/en
Priority to HU0500019A priority patent/HUP0500019A2/en
Priority to US10/501,237 priority patent/US7293504B2/en
Priority to PCT/FR2003/000080 priority patent/WO2003058154A1/en
Priority to AU2003214308A priority patent/AU2003214308A1/en
Priority to JP2003558418A priority patent/JP4295115B2/en
Priority to CZ2004-794A priority patent/CZ304930B6/en
Priority to PL371132A priority patent/PL203293B1/en
Priority to CA002472652A priority patent/CA2472652A1/en
Priority to CNB038021331A priority patent/CN100365374C/en
Priority to KR1020047010757A priority patent/KR100916824B1/en
Priority to MXPA04006624A priority patent/MXPA04006624A/en
Publication of EP1327850A1 publication Critical patent/EP1327850A1/en
Priority to ZA200405412A priority patent/ZA200405412B/en
Application granted granted Critical
Publication of EP1327850B1 publication Critical patent/EP1327850B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/195—Manufacture

Definitions

  • the present invention relates to an electropyrotechnic initiator and a method of assembling an electropyrotechnic initiator.
  • the first uses "glass-to-metal crossing" type bases and the second to "plastic" base or type initiators.
  • Initiators belonging to the first category are often regarded as synonymous with assurance of hermeticity and infallible protection of pyrotechnic compositions and / or explosives against the effects of extreme environments (humidity among others).
  • glass-metal type crossings are sensitive to the mechanical and thermal stresses that can be applied to them during the various stages of their assembly process or during the assembly steps (crimping, welding, etc.). ) of said initiators to a device for civil pyrotechnic applications (for example, pretensioners, air bags for automobile safety), military or space.
  • the initiators on plastic traverse suffer for their part from a hermeticity problem related to the plastic material (for example, moisture-sensitive polyamide) retained for their realization or at their internal joints (by clipping, gluing ..) unsealed .
  • a hermeticity problem related to the plastic material for example, moisture-sensitive polyamide
  • US Pat. No. 5,423,261 (Bernardy Jean-Claude et al.) Of June 13, 1995
  • US Pat. No. 5,648,634 (Avery Marks Lucas et al.) Of July 15, 1997, relate to an electropyrotechnic initiator formed of two subwoofers. plastic assemblies and ultrasonically welded to form a hermetic assembly.
  • the object of the present invention is to provide an electropyrotechnic initiator of the plastic type, simple in design and in its operating mode, compact and economical having excellent hermetic qualities.
  • the electropyrotechnic initiator comprises a housing.
  • This housing comprises a first 2 and second 3 subassemblies.
  • the first subassembly 2 comprises a wall 4 of plastic secured to a bottom 5 also made of plastic, the first subassembly 2 being made in one piece.
  • This first subassembly 2 is called a container.
  • Said container 2 receives a pyrotechnic charge 6 by a dry loading method.
  • the load 6 comprises at least one composition.
  • the container 2 receives a first composition 7 called secondary composition and a second composition 8 called primary composition.
  • Each of the compositions of the pyrotechnic charge 6 is mass-loaded and is precompressed.
  • the precompression is carried out with a pressure lower than 120 bars for the primary composition 8 and with a pressure greater than 150 bars for the secondary composition 7.
  • the final compression force is ensured during the hermetic assembly of the first sub-composition. set 2 with a second subassembly 3 comprising the electrical part of the initiator, said subassembly 3 also being called a base.
  • the assembly is performed by ultrasonic welding ensuring extreme tightness.
  • the height difference between the outermost layer 9 of the pyrotechnic charge 6 after precompressing the compositions and the face 15 of the container 2 is advantageously called the vacuum height.
  • the first 7 and second 8 compositions are free from heavy metals in an effort to respect the environment. Said compositions are also resistant to heating caused by ultrasonic welding which is of the order of 260 ° C.
  • the inner diameter D 1 of the first subassembly 2 is less than 5.6 mm.
  • the adaptation of the interior volume of the container 2 to allow the loading of pyrotechnic compositions of different natures and particle size is therefore ensured by the variation of the height of said container 2.
  • the small diameter inside the first subassembly 2 advantageously avoids having to resort to an intermediate pyrotechnic container such as, for example, a ring attached to the base 3 to limit the pyrotechnic charge 6. This limitation of the pyrotechnic charge 6 offers plus increased security without risk to the reliability of pyrotechnic operation to the extent that the thickness of the loaded composition is sufficient.
  • the second subassembly 3, the plastic base has a main axis 10 and is traversed by at least two pins 11, 12 in the direction of said axis 10.
  • the pins 11, 12 are interconnected by an electrical bridge 13 on one face 14 of said subassembly 3.
  • the electrical bridge 13 is of the resistive type.
  • it is either a filament or a metal layer.
  • the electric bridge 13 is of the semiconductor type.
  • Said face 14 is recessed symmetrically over a height H and a depth L so that the outer diameter of the portion of the second subassembly 3 having been recessed is D 2 .
  • the height H is between 2 and 3 mm.
  • the inside diameter D 1 of the first subset 2 is smaller than the outside diameter D 2 .
  • these parts of the first 2 and second 3 subassemblies facing each other during ultrasonic welding, this difference in diameter between D 1 and D 2 ensures a maximum hermeticity and a sufficient dielectric strength for the insulation of the internal parts. conductors 11, 12 of the initiator.
  • the weld joint 16 is a shear joint.
  • the recessed face 14 of the second subassembly 3 also has a symmetrical recess 17 of height h and width 1 to form an island of elevation of the electrical bridge, this ensuring a good intimacy between the electric bridge 13 and the primary composition 8.
  • h is between 0.5 and 1.0 mm and the width 1 is between 0.2 and 0.8 mm.
  • the second subassembly 3 is overmolded on pins 11, 12.
  • the term "pin” is used to supply current to the initiator.
  • the pins 11, 12 comprise electrodes.
  • the electrodes are striated. These grooves 18 not only ensure a hermetic barrier of the initiator along the pins 11, 12 but they also facilitate the fixation of the plastic material during overmolding.
  • the pins 11, 12 are wires.
  • the first 2 and second 3 subassemblies are made of the same plastic material to allow their assembly by ultrasonic welding.
  • the plastic used to make the first 2 and second 3 subassemblies is a material with low moisture absorption.
  • the plastic is a polyketone.
  • the plastic is a polybutylene teraphthalate (PBT).
  • the plastic material is a polyamide.
  • polyamides that may be used according to the invention mention may be made of polyamides with low moisture uptake, and in particular the polyamide of formula: designated in this application by PA 6.12.
  • FIG. 4 shows an ultrasonic weld joint 16 which does not include a shear joint but a semi-shear joint.
  • the present pyrotechnic initiator can advantageously be used for the production of apparatus for civil, military and space pyrotechnic applications.
  • the initiator is polyketone, it may advantageously be placed in contact with or placed near vapors or liquids of chemicals.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Air Bags (AREA)
  • Lighters Containing Fuel (AREA)
  • Conductive Materials (AREA)
  • Push-Button Switches (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)

Abstract

Electro pyrotechnic initiation switch consists of a housing made from two plastic sub-assemblies: a first sub-assembly (2) having a wall (4) and base (5) forming a container for a pre-compressed pyrotechnic charge made from two compounds (7, 8), and a second sub-assembly (3) with two conducting pins (11, 12) in line with its main axis. Electro pyrotechnic initiation switch consists of a housing made from two plastic sub-assemblies: a first sub-assembly (2) having a wall (4) and base (5) forming a container for a pre-compressed pyrotechnic charge made from two compounds (7, 8), and a second sub-assembly (3) with two conducting pins (11, 12) in line with its main axis, connected by an electrical bridge (13) at one end (14) of the sub-assembly. The two sub-assemblies, made from a plastic with a low moisture take-up, are sealed together by ultrasound welding.

Description

La présente invention concerne un initiateur électropyrotechnique et un procédé d'assemblage d'un initiateur électropyrotechnique.The present invention relates to an electropyrotechnic initiator and a method of assembling an electropyrotechnic initiator.

Il existe deux grandes catégories d'initiateur. La première fait appel à des embases de type "traversée verre-métal" et la seconde à des initiateurs à embase ou traversée de type "plastique". Les initiateurs appartenant à la première catégorie sont souvent regardés comme étant synonymes d'assurance d'herméticité et de protection infaillible des compositions pyrotechniques et/ou des explosifs contre les effets des environnements extrêmes (humidité entre autres). Or il est connu que les traversées de type verre-métal sont sensibles aux contraintes mécaniques et thermiques qui peuvent leur être appliquées au cours des différentes étapes de leur processus d'assemblage ou encore lors des étapes de montage (sertissage, soudage,...) desdits initiateurs à un dispositif d'applications pyrotechniques civiles (par exemple, prétensionneurs, coussins gonflables pour la sécurité automobile), militaires ou spatiales.There are two main categories of initiator. The first uses "glass-to-metal crossing" type bases and the second to "plastic" base or type initiators. Initiators belonging to the first category are often regarded as synonymous with assurance of hermeticity and infallible protection of pyrotechnic compositions and / or explosives against the effects of extreme environments (humidity among others). Now it is known that glass-metal type crossings are sensitive to the mechanical and thermal stresses that can be applied to them during the various stages of their assembly process or during the assembly steps (crimping, welding, etc.). ) of said initiators to a device for civil pyrotechnic applications (for example, pretensioners, air bags for automobile safety), military or space.

Par ailleurs si le recours à une embase de "traversée verre-métal" garantit a priori l'assurance d'une barrière hermétique de l'embase le long des broches d'amenée de courant, cela n'est pas forcément vrai pour la liaison entre l'embase et le contenant pyrotechnique.Moreover, if the use of a "glass-to-metal crossing" base guarantees a priori the assurance of a hermetic barrier of the base along the current supply pins, this is not necessarily true for the connection between the base and the pyrotechnic container.

Les initiateurs sur traversée plastique souffrent pour leur part d'un problème d'herméticité lié au matériau plastique (par exemple, polyamide sensible à l'humidité) retenu pour leur réalisation ou à leurs jointures internes (par clipsage, collage..) non étanches.The initiators on plastic traverse suffer for their part from a hermeticity problem related to the plastic material (for example, moisture-sensitive polyamide) retained for their realization or at their internal joints (by clipping, gluing ..) unsealed .

Enfin, les initiateurs actuels qu'ils appartiennent à l'une quelconque des catégories susmentionnées comprennent généralement plusieurs sous-ensembles à assembler rendant le coût total d'un tel dispositif onéreux. Les initiateurs de la première catégorie sont significativement les plus chers du fait de la préparation nécessaire (surfaçage,...) desdites traversées "verre-métal".Finally, current initiators that they belong to any of the aforementioned categories generally include several subassemblies to assemble making the total cost of such an expensive device. The initiators of the first category are significantly more expensive because the preparation required (surfacing, ...) said "glass-metal" crossings.

On connaît par ailleurs le brevet US-5,423,261 (Bernardy Jean-Claude et al.) du 13 Juin 1995 ainsi que le brevet US-5,648,634 (Avery Marks Lucas et al.) du 15 Juillet 1997 qui concernent un initiateur électropyrotechnique formé de deux sous-ensembles en matière plastique et soudés par ultrasons pour former un assemblage hermétique.Furthermore, US Pat. No. 5,423,261 (Bernardy Jean-Claude et al.) Of June 13, 1995, and US Pat. No. 5,648,634 (Avery Marks Lucas et al.) Of July 15, 1997, relate to an electropyrotechnic initiator formed of two subwoofers. plastic assemblies and ultrasonically welded to form a hermetic assembly.

L'objectif de la présente invention est de proposer un initiateur électropyrotechnique de type plastique, simple dans sa conception et dans son mode opératoire, compact et économique présentant d'excellentes qualités d'herméticité.The object of the present invention is to provide an electropyrotechnic initiator of the plastic type, simple in design and in its operating mode, compact and economical having excellent hermetic qualities.

A cet effet, l'invention concerne un initiateur électropyrotechnique comportant un boîtier en matière plastique et une charge pyrotechnique, ladite charge comprenant au moins une composition.
Selon l'invention, le boîtier comporte deux sous-ensembles :

  • un premier sous-ensemble , fait d'une seule pièce, comprenant une paroi en plastique solidaire d'un fond également en plastique, ayant une face, et formant un contenant,
  • un deuxième sous-ensemble en plastique ayant un axe principal, traversé par au moins deux broches selon la direction dudit axe, lesdites broches étant reliées entre elles par un pont électrique sur une face dudit sous-ensemble, ladite face étant évidée symétriquement sur une hauteur H et une largeur L, ledit sous-ensemble formant une embase,
  • l'assemblage hermétique des premier et deuxième sous-ensembles est réalisé par soudage ultrasons, et le diamètre intérieur du premier sous-ensemble est inférieur au diamètre externe de la partie évidée du deuxième sous-ensemble.
To this end, the invention relates to an electropyrotechnic initiator comprising a plastic housing and a pyrotechnic charge, said load comprising at least one composition.
According to the invention, the housing comprises two subsets:
  • a first subassembly, made of a single piece, comprising a plastic wall integral with a bottom also made of plastic, having a face, and forming a container,
  • a second plastic subassembly having a main axis, traversed by at least two pins in the direction of said axis, said pins being interconnected by an electrical bridge on a face of said subassembly, said face being recessed symmetrically over a height H and a width L, said subassembly forming a base,
  • the hermetic assembly of the first and second subassemblies is achieved by ultrasonic welding, and the inner diameter of the first subassembly is smaller than the outer diameter of the recessed portion of the second subassembly.

La présente invention concerne également les caractéristiques qui ressortiront au cours de la description qui va suivre et qui devront être considérées isolément ou selon toutes leurs combinaisons techniquement possibles :

  • le joint de soudure ultrason est un joint en cisaillement,
  • le joint de soudure ultrason est un joint en semi-cisaillement,
  • la face évidée du deuxième sous-ensemble présente un évidement symétrique de hauteur h et de largeur 1 pour former un îlot de surélévation du pont électrique.
  • le plastique utilisé pour réaliser le premier et deuxième sous-ensembles est un matériau à faible reprise d'humidité,
  • le plastique est un polycétone,
  • le plastique est un polybutylène teraphtalate (PBT),
  • le plastique est un polyamide,
  • le plastique est le polyamide PA 6.12,
  • la hauteur de vide h' est inférieure à la hauteur h+H, H étant la hauteur du talon de soudure h la hauteur de l'îlot , et h' la différence de hauteur entre la couche la plus externe de la charge pyrotechnique après précompressage des compositions et la face du contenant,
  • le deuxième sous-ensemble est surmoulé sur les broches,
  • les broches sont des électrodes,
  • les électrodes sont striées.
The present invention also relates to the features which will become apparent in the course of the description which will follow and which will have to be considered in isolation or in all their technically possible combinations:
  • the ultrasonic welding seal is a shear joint,
  • the ultrasonic weld joint is a semi-shear joint,
  • the recessed face of the second subassembly has a symmetrical recess of height h and width 1 to form an island of elevation of the electrical bridge.
  • the plastic used to make the first and second subassemblies is a material with low moisture absorption,
  • plastic is a polyketone,
  • the plastic is a polybutylene teraphthalate (PBT),
  • the plastic is a polyamide,
  • the plastic is polyamide PA 6.12,
  • the void height h 'is smaller than the height h + H, where H is the height of the weld heel at the height of the island, and h is the difference in height between the outermost layer of the pyrotechnic charge after precompression compositions and the face of the container,
  • the second subassembly is overmolded on the pins,
  • the pins are electrodes,
  • the electrodes are striated.

L'invention sera décrite plus en détail en référence aux dessins annexés dans lesquels:

  • la figure 1 est une représentation schématique d'un initiateur de type plastique, selon l'invention;
  • la figure 2 représente un contenant, premier sous-ensemble de l'initiateur électropyrotechnique, selon l'invention;
  • la figure 3 représente une embase, deuxième sous-ensemble de l'initiateur électropyrotechnique, selon l'invention;
  • la figure 4 est une représentation schématique d'un autre mode de réalisation du joint de soudure ultrason, selon l'invention;
The invention will be described in more detail with reference to the accompanying drawings in which:
  • Figure 1 is a schematic representation of a plastic type initiator according to the invention;
  • FIG. 2 represents a container, the first subset of the electropyrotechnic initiator, according to the invention;
  • FIG. 3 represents a base, the second subset of the electropyrotechnic initiator, according to the invention;
  • Figure 4 is a schematic representation of another embodiment of the ultrasonic weld seam, according to the invention;

L'initiateur électropyrotechnique, selon l'invention, comporte un boîtier. Ce boîtier comporte un premier 2 et deuxième 3 sous-ensembles. Le premier sous-ensemble 2 comprend une paroi 4 en plastique solidaire d'un fond 5 également en plastique, le premier sous-ensemble 2 étant fait d'une seule pièce. Ce premier sous ensemble 2 est appelé un contenant. Ledit contenant 2 reçoit une charge pyrotechnique 6 par un procédé de chargement à sec. La charge 6 comprend au moins une composition. Dans un mode de réalisation, le contenant 2 reçoit une première composition 7 appelée composition secondaire et une seconde composition 8 appelée composition primaire. Chacune des compositions de la charge pyrotechnique 6 est chargée en masse puis est précompressée. Avantageusement, la précompression est réalisée avec une pression inférieure à 120 bars pour la composition primaire 8 et avec une pression supérieure à 150 bars pour la composition secondaire 7. L'effort de compression finale est assuré lors de l'assemblage hermétique du premier sous-ensemble 2 avec un deuxième sous-ensemble 3 comportant la partie électrique de l'initiateur, ledit sous-ensemble 3 étant aussi appelée embase. L'assemblage est réalisé par soudage ultrasons assurant une extrême herméticité. On appelle ici - hauteur de vide - h' la différence de hauteur entre la couche 9 la plus externe de la charge pyrotechnique 6 après précompressage des compositions et la face 15 du contenant 2. Avantageusement, les première 7 et deuxième 8 compositions sont exemptes de métaux lourds dans un souci de respect de l'environnement. Lesdites compositions sont également résistantes à l'échauffement provoqué par la soudure ultrason qui est de l'ordre de 260°C.The electropyrotechnic initiator according to the invention comprises a housing. This housing comprises a first 2 and second 3 subassemblies. The first subassembly 2 comprises a wall 4 of plastic secured to a bottom 5 also made of plastic, the first subassembly 2 being made in one piece. This first subassembly 2 is called a container. Said container 2 receives a pyrotechnic charge 6 by a dry loading method. The load 6 comprises at least one composition. In one embodiment, the container 2 receives a first composition 7 called secondary composition and a second composition 8 called primary composition. Each of the compositions of the pyrotechnic charge 6 is mass-loaded and is precompressed. Advantageously, the precompression is carried out with a pressure lower than 120 bars for the primary composition 8 and with a pressure greater than 150 bars for the secondary composition 7. The final compression force is ensured during the hermetic assembly of the first sub-composition. set 2 with a second subassembly 3 comprising the electrical part of the initiator, said subassembly 3 also being called a base. The assembly is performed by ultrasonic welding ensuring extreme tightness. The height difference between the outermost layer 9 of the pyrotechnic charge 6 after precompressing the compositions and the face 15 of the container 2 is advantageously called the vacuum height. Advantageously, the first 7 and second 8 compositions are free from heavy metals in an effort to respect the environment. Said compositions are also resistant to heating caused by ultrasonic welding which is of the order of 260 ° C.

Dans un mode de réalisation préféré, le diamètre intérieur D1 du premier sous-ensemble 2 est inférieur à 5,6 mm. L'adaptation du volume intérieur du contenant 2 afin de permettre le chargement de compositions pyrotechniques de différentes natures et granulométrie est donc assurée par la variation de la hauteur dudit contenant 2. Le faible diamètre intérieur du premier sous-ensemble 2 permet avantageusement de ne pas avoir à recourir à un contenant pyrotechnique intermédiaire tel que, par exemple, une bague rapportée sur l'embase 3 pour limiter la charge pyrotechnique 6. Cette limitation de la charge pyrotechnique 6 offre de plus une sécurité accrue sans risque pour la fiabilité de fonctionnement pyrotechnique dans la mesure où l'épaisseur de la composition chargée est suffisante.In a preferred embodiment, the inner diameter D 1 of the first subassembly 2 is less than 5.6 mm. The adaptation of the interior volume of the container 2 to allow the loading of pyrotechnic compositions of different natures and particle size is therefore ensured by the variation of the height of said container 2. The small diameter inside the first subassembly 2 advantageously avoids having to resort to an intermediate pyrotechnic container such as, for example, a ring attached to the base 3 to limit the pyrotechnic charge 6. This limitation of the pyrotechnic charge 6 offers plus increased security without risk to the reliability of pyrotechnic operation to the extent that the thickness of the loaded composition is sufficient.

Le deuxième sous-ensemble 3, l'embase, en plastique a un axe principal 10 et est traversé par au moins deux broches 11, 12 selon la direction dudit axe 10. Les broches 11, 12 sont reliées entre elles par un pont électrique 13 sur une face 14 dudit sous-ensemble 3. Dans un mode de réalisation, le pont électrique 13 est de type résistif. Avantageusement, il s'agit soit d'un filament soit d'une couche métallique. Dans un autre mode de réalisation, le pont électrique 13 est de type semi-conducteur. Ladite face 14 est évidée symétriquement sur une hauteur H et une profondeur L de sorte que le diamètre externe de la partie du deuxième sous-ensemble 3 ayant été évidée soit D2. Avantageusement, la hauteur H est comprise entre 2 et 3 mm. Dans un mode de réalisation préféré, le diamètre intérieur D1 du premier sous-ensemble 2 est inférieur au diamètre externe D2. Ces parties des premier 2 et deuxième 3 sous-ensembles étant mises en vis-à-vis lors du soudage ultrasons, cette différence de diamètre entre D1 et D2 assure une herméticité maximale et une rigidité diélectrique suffisante pour l'isolation des parties internes conductrices 11, 12 de l'initiateur. Avantageusement, le joint de soudure 16 est un joint en cisaillement. La face évidée 14 du deuxième sous-ensemble 3 présente également un évidement 17 symétrique de hauteur h et de largeur 1 pour former un îlot de surélévation du pont électrique, ceci assurant une bonne intimité entre le pont électrique 13 et la composition primaire 8. Avantageusement h est comprise entre 0,5 et 1,0 mm et la largeur 1 est comprise entre 0,2 et 0,8 mm.The second subassembly 3, the plastic base has a main axis 10 and is traversed by at least two pins 11, 12 in the direction of said axis 10. The pins 11, 12 are interconnected by an electrical bridge 13 on one face 14 of said subassembly 3. In one embodiment, the electrical bridge 13 is of the resistive type. Advantageously, it is either a filament or a metal layer. In another embodiment, the electric bridge 13 is of the semiconductor type. Said face 14 is recessed symmetrically over a height H and a depth L so that the outer diameter of the portion of the second subassembly 3 having been recessed is D 2 . Advantageously, the height H is between 2 and 3 mm. In a preferred embodiment, the inside diameter D 1 of the first subset 2 is smaller than the outside diameter D 2 . These parts of the first 2 and second 3 subassemblies facing each other during ultrasonic welding, this difference in diameter between D 1 and D 2 ensures a maximum hermeticity and a sufficient dielectric strength for the insulation of the internal parts. conductors 11, 12 of the initiator. Advantageously, the weld joint 16 is a shear joint. The recessed face 14 of the second subassembly 3 also has a symmetrical recess 17 of height h and width 1 to form an island of elevation of the electrical bridge, this ensuring a good intimacy between the electric bridge 13 and the primary composition 8. Advantageously h is between 0.5 and 1.0 mm and the width 1 is between 0.2 and 0.8 mm.

Le deuxième sous-ensemble 3 est surmoulé sur des broches 11, 12. On appelle ici - broche - des moyens d'amenée de courant pour l'initiateur. Dans un premier mode de réalisation, les broches 11, 12 comprennent des électrodes. Avantageusement, les électrodes sont striées. Ces stries 18 assurent non seulement une barrière hermétique de l'initiateur le long des broches 11, 12 mais elles facilitent également la fixation du matériau plastique lors du surmoulage. Dans un deuxième mode de réalisation, les broches 11, 12 sont des fils.The second subassembly 3 is overmolded on pins 11, 12. Here, the term "pin" is used to supply current to the initiator. In a first embodiment, the pins 11, 12 comprise electrodes. Advantageously, the electrodes are striated. These grooves 18 not only ensure a hermetic barrier of the initiator along the pins 11, 12 but they also facilitate the fixation of the plastic material during overmolding. In a second embodiment, the pins 11, 12 are wires.

Le premier 2 et deuxième 3 sous-ensembles sont réalisés dans le même matériau plastique afin de permettre leur assemblage par soudage ultrasons. Le plastique utilisé pour réaliser le premier 2 et deuxième 3 sous-ensembles est un matériau à faible reprise d'humidité. Dans un premier mode de réalisation, le plastique est un polycétone. Dans un autre mode de réalisation, le plastique est un polybutylène teraphtalate (PBT). Dans un mode de réalisation préféré, le matériau plastique est un polyamide. A titre de polyamides utilisables selon l'invention, on peut citer les polyamides à faible reprise d'humidité, et en particulier le polyamide de formule :

Figure imgb0001
désigné dans la présente demande par PA 6.12.The first 2 and second 3 subassemblies are made of the same plastic material to allow their assembly by ultrasonic welding. The plastic used to make the first 2 and second 3 subassemblies is a material with low moisture absorption. In a first embodiment, the plastic is a polyketone. In another embodiment, the plastic is a polybutylene teraphthalate (PBT). In a preferred embodiment, the plastic material is a polyamide. As polyamides that may be used according to the invention, mention may be made of polyamides with low moisture uptake, and in particular the polyamide of formula:
Figure imgb0001
 designated in this application by PA 6.12.

Les sous-ensembles 2, 3 de l'initiateur selon l'invention ne sauraient être limités à la description qui précède et sont susceptibles de modifications avec l'évolution des technologies. Ainsi, la figure 4 montre un joint de soudure 16 ultrason qui ne comprend pas un joint en cisaillement mais un joint en semi-cisaillement.Subsets 2, 3 of the initiator according to the invention can not be limited to the foregoing description and may be modified with the evolution of the technologies. Thus, Figure 4 shows an ultrasonic weld joint 16 which does not include a shear joint but a semi-shear joint.

Le présent initiateur pyrotechnique peut avantageusement être utilisé pour la réalisation de dispositif d'applications pyrotechniques civiles, militaires et spatiales. Dans le cas où l'initiateur est en polycétone, il peut avantageusement être mis en contact ou placé à proximité de vapeurs ou liquides de produits chimiques.The present pyrotechnic initiator can advantageously be used for the production of apparatus for civil, military and space pyrotechnic applications. In the case where the initiator is polyketone, it may advantageously be placed in contact with or placed near vapors or liquids of chemicals.

Claims (16)

  1. An electropyrotechnic initiator comprising a housing of plastic material and a pyrotechnic charge (6), said charge (6) comprising at least one composition the housing comprising two sub-assemblies:
    - a first sub-assembly (2) made in a single part containing a plastic wall (4) integral with a bottom (5) also made of plastic material, having a face (15) and forming a container,
    - a second plastic sub-assembly (3) having a main axis (10), crossed by at least two pins (11, 12) along the direction of said axis (10), said pins (11, 12) being connected together by an electric bridge (13) on a face (14) of said sub-assembly (3), said face (14) being notched symmetrically over a height H and a width L, said sub-assembly (3) forming a base,
    - the hermetic assembly of the first (2) and second (3) sub-assemblies being made by ultrasonic welding,
    - characterised in that the internal diameter D1 of the first sub-assembly (2) is smaller than the external diameter D2 of the notched portion of the second sub-assembly (3).
  2. An initiator according to claim 1, characterised in that the notched face (14) of the second sub-assembly (3) has a symmetrical recess (17) with height h and width I to form a raised block of the electric bridge (13).
  3. An initiator according to any one of claims 1 or 2, characterised in that the plastic material used to make the first and second sub-assemblies is a material with low regain of humidity.
  4. An initiator according to claim 3, characterised in that the plastic material is a polyketone.
  5. An initiator according to claim 3, characterised in that the plastic material is a terephthalate polybutylene (PBT).
  6. An initiator according to claim 3, characterised in that the plastic material is a polyamide.
  7. An initiator according to claim 6, characterised in that the plastic material is the polyamide PA 6.12.
  8. An initiator according to any one of claims 1 to 7, characterised in that the second sub-assembly (3) is overmoulded on the pins (11, 12).
  9. An initiator according to claim 8, characterised in that the pins (11, 12) comprise electrodes.
  10. An initiator according to claim 9, characterised in that the electrodes are scored.
  11. An initiator according to any one of claims 2 to 10, characterised in that the vacuum height h' is smaller than the height h + H, H being the height of the welding heel, h the height of the block and h' the differential height between the outmost external layer (9) of the pyrotechnic charge (6) after precompressing the compositions and the face (15) of the container (2).
  12. An initiator according to any one of claims 1 to 11, characterised in that the ultrasonic welding joint (16) is a shear joint.
  13. An initiator according to any one of claims 1 to 11, characterised in that the ultrasonic welding joint (16) is a semi shear-joint.
  14. A method for assembling an electropyrotechnic initiator characterised in that it comprises :
    - the making of a first sub-assembly (2) and of a second sub-assembly (3) according to any one of claims 1 to 10 ;
    - said first sub-assembly (2) receiving a pyrotechnic charge (6) by a dry loading process; and
    - the assembly made by ultrasonic welding of said first sub-assembly and said second sub-assembly.
  15. A method for assembling an electropyrotechnic initiator according to claim 14, characterized in that the it comprises a primary composition (8) and a secondary composition (7), each of the composition (7, 8) of the pyrotechnic charge being pre-compressed.
  16. A method for assembling an electropyrotechnic initiator according to claim 15, characterised in that the primary composition (8) is pre-compressed with a pressure smaller than 120 bars and the secondary composition (7) is pre-compressed with a pressure greater than 150 bars.
EP02290061A 2002-01-10 2002-01-10 Electro-explosive initiator and method of manufacture Expired - Lifetime EP1327850B1 (en)

Priority Applications (17)

Application Number Priority Date Filing Date Title
AT02290061T ATE326679T1 (en) 2002-01-10 2002-01-10 PYROTECHNICAL ELECTRIC LIGHTER AND ASSEMBLY METHOD
ES02290061T ES2261605T3 (en) 2002-01-10 2002-01-10 ELECTROPIROTECHNICAL INITIATOR.
DE60211462T DE60211462T2 (en) 2002-01-10 2002-01-10 Pyrotechnic electric lighter and assembly method
EP02290061A EP1327850B1 (en) 2002-01-10 2002-01-10 Electro-explosive initiator and method of manufacture
HU0500019A HUP0500019A2 (en) 2002-01-10 2003-01-10 Electro-pyrotechnic initiator
US10/501,237 US7293504B2 (en) 2002-01-10 2003-01-10 Electro-pyrotechnic initiator
PCT/FR2003/000080 WO2003058154A1 (en) 2002-01-10 2003-01-10 Electro-pyrotechnic initiator
AU2003214308A AU2003214308A1 (en) 2002-01-10 2003-01-10 Electro-pyrotechnic initiator
TW092100506A TWI282403B (en) 2002-01-10 2003-01-10 Electropyrotechnic initiator
JP2003558418A JP4295115B2 (en) 2002-01-10 2003-01-10 Electric rocket ignition device
CZ2004-794A CZ304930B6 (en) 2002-01-10 2003-01-10 Electric pyrotechnical initiator
PL371132A PL203293B1 (en) 2002-01-10 2003-01-10 Electro-pyrotechnic initiator
CA002472652A CA2472652A1 (en) 2002-01-10 2003-01-10 Electro-pyrotechnic initiator
CNB038021331A CN100365374C (en) 2002-01-10 2003-01-10 Electro-pyrotechnic initiator
KR1020047010757A KR100916824B1 (en) 2002-01-10 2003-01-10 Electropyrotechnic initiator
MXPA04006624A MXPA04006624A (en) 2002-01-10 2003-01-10 Electro-pyrotechnic initiator.
ZA200405412A ZA200405412B (en) 2002-01-10 2004-07-07 Electro-pyrotechnic initiator.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02290061A EP1327850B1 (en) 2002-01-10 2002-01-10 Electro-explosive initiator and method of manufacture

Publications (2)

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EP1327850A1 EP1327850A1 (en) 2003-07-16
EP1327850B1 true EP1327850B1 (en) 2006-05-17

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EP02290061A Expired - Lifetime EP1327850B1 (en) 2002-01-10 2002-01-10 Electro-explosive initiator and method of manufacture

Country Status (17)

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US (1) US7293504B2 (en)
EP (1) EP1327850B1 (en)
JP (1) JP4295115B2 (en)
KR (1) KR100916824B1 (en)
CN (1) CN100365374C (en)
AT (1) ATE326679T1 (en)
AU (1) AU2003214308A1 (en)
CA (1) CA2472652A1 (en)
CZ (1) CZ304930B6 (en)
DE (1) DE60211462T2 (en)
ES (1) ES2261605T3 (en)
HU (1) HUP0500019A2 (en)
MX (1) MXPA04006624A (en)
PL (1) PL203293B1 (en)
TW (1) TWI282403B (en)
WO (1) WO2003058154A1 (en)
ZA (1) ZA200405412B (en)

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CN1290893C (en) * 2002-05-03 2006-12-20 詹森药业有限公司 Polymeric microemulsions
FR2861389B1 (en) * 2003-10-22 2006-03-10 Davey Bickford LOW SENSITIVE PYROTECHNIC COMPOSITION WITH STATIC ELECTRICITY AND ULTRASOUND.
EP1710532B1 (en) * 2005-04-04 2009-12-30 TRW Airbag Systems GmbH Modular electro-pyrotechnic igniter with plastic half-shells
FR2885684B1 (en) * 2005-05-10 2012-04-27 Davey Bickford ELECTRICAL INITIATOR HAVING A PLASTIC STRUCTURE AND RAPID OPERATION AND A GAS GENERATOR COMPRISING SUCH AN INITIATOR
DE102005058721A1 (en) * 2005-12-08 2007-06-14 Trw Airbag Systems Gmbh Pyrotechnic actuator unit and gas bag module with such an Akruatoreinheit
CA2741091C (en) * 2008-10-24 2017-01-17 Battelle Memorial Institute Electronic detonator system
DE102012010608A1 (en) * 2012-05-16 2013-11-21 Trw Airbag Systems Gmbh Lighter and method of making a lighter for a gas generator
DE102018218001B4 (en) * 2018-10-22 2021-09-30 Schott Ag Method for producing a connection pin for bushings, as well as connection pin
RU2723364C1 (en) * 2019-10-31 2020-06-10 Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом) Electric detonator manufacturing method

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US5235915A (en) * 1992-05-26 1993-08-17 Stevens Robert D Shotgun slug tracer round and improved shotgun slug
FR2698687B1 (en) * 1992-12-01 1995-02-03 Giat Ind Sa Pyrotechnic initiator.
US5711531A (en) * 1993-10-20 1998-01-27 Quantic Industries, Inc. Electrical initiator seal
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US5479861A (en) * 1994-01-03 1996-01-02 Kinchin; Anthony E. Projectile with sabot
US5932832A (en) * 1996-04-15 1999-08-03 Autoliv Asp, Inc. High pressure resistant initiator with integral metal oxide varistor for electro-static discharge protection

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CZ2004794A3 (en) 2005-03-16
MXPA04006624A (en) 2005-03-31
KR100916824B1 (en) 2009-09-14
EP1327850A1 (en) 2003-07-16
PL203293B1 (en) 2009-09-30
TWI282403B (en) 2007-06-11
TW200305708A (en) 2003-11-01
US20050081731A1 (en) 2005-04-21
HUP0500019A2 (en) 2005-06-28
ES2261605T3 (en) 2006-11-16
CN1615425A (en) 2005-05-11
AU2003214308A1 (en) 2003-07-24
JP4295115B2 (en) 2009-07-15
CA2472652A1 (en) 2003-07-17
US7293504B2 (en) 2007-11-13
ZA200405412B (en) 2005-10-11
CN100365374C (en) 2008-01-30
WO2003058154A1 (en) 2003-07-17
ATE326679T1 (en) 2006-06-15
DE60211462T2 (en) 2007-04-26
JP2005514578A (en) 2005-05-19
CZ304930B6 (en) 2015-01-28
DE60211462D1 (en) 2006-06-22
KR20040101203A (en) 2004-12-02
PL371132A1 (en) 2005-06-13

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