EP0600791B1 - Pyrotechnische elektrische Anzünder - Google Patents

Pyrotechnische elektrische Anzünder Download PDF

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Publication number
EP0600791B1
EP0600791B1 EP93402906A EP93402906A EP0600791B1 EP 0600791 B1 EP0600791 B1 EP 0600791B1 EP 93402906 A EP93402906 A EP 93402906A EP 93402906 A EP93402906 A EP 93402906A EP 0600791 B1 EP0600791 B1 EP 0600791B1
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EP
European Patent Office
Prior art keywords
plug
housing
case
pyrotechnic
substance
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
Application number
EP93402906A
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English (en)
French (fr)
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EP0600791A1 (de
Inventor
Jean-Claude Bernardy
Yves Moya-Naranjo
Guy Lagofun
Hervé Lebreton
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Giat Industries SA
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Giat Industries SA
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Publication of EP0600791A1 publication Critical patent/EP0600791A1/de
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Classifications

    • 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
    • F42B3/11—Initiators therefor characterised by the material used, e.g. for initiator case or electric leads
    • 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
    • F42B3/103—Mounting initiator heads in initiators; Sealing-plugs
    • 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
    • F42B3/12—Bridge initiators
    • F42B3/125—Bridge initiators characterised by the configuration of the bridge initiator case
    • F42B3/127—Bridge initiators characterised by the configuration of the bridge initiator case the case having burst direction defining elements

Definitions

  • the field of the present invention is that of pyrotechnic initiators, that is to say components making it possible to transmit a pyrotechnic effect to a pyrotechnic chain.
  • Initiators are already known which are used in the munitions field. They generally comprise a metal cell inside which is placed by compression a pyrotechnic substance.
  • the cell is made of relatively thin metal, it must be closed with a metal flake intended to rupture under the pressure generated by the pyrotechnic substance.
  • the paillet is itself covered with varnish to ensure sealing against ambient humidity.
  • the electrodes are carried by an insulating base, most often made of sintered glass or ceramic.
  • This base is a piece whose manufacture is delicate and quite expensive.
  • the cell itself must be placed inside a support box which will carry the electrical connectors and allow the mounting of the initiator in the pyrotechnic chain.
  • Such a type of initiator does not make it possible to control the size of the housing fragments obtained, which is penalizing for use in other technical fields than that of quarries, for example in the field of armaments or in that of systems. of security.
  • Patent US4576094 which forms a basis for the preamble of claims 1 and 2, describes a plastic initiator for a missile propellant and which has a thin cylindrical wall fragmented during initiation. The aim is to avoid blocking the missile nozzle with the initiator's operating residues. This initiator has drawbacks, however.
  • the fineness of the envelope also does not ensure sufficient confinement of the pyrotechnic composition.
  • the invention thus aims to propose an initiator which is both extremely reliable, robust and inexpensive, while ensuring an initiation which generates a minimum number of debris so as not to disturb the system initiated.
  • the initiator according to the invention is made of plastic, the advantage of such an arrangement is that it allows the whole of the initiator to be produced in an extremely simple and inexpensive manner.
  • this box must be rigid enough to be able to hold the pyrotechnic substance which must also be able to be compressed directly inside the box.
  • the production cost of such an initiator can thus be substantially of the order of 1% of that of an initiator according to the state of the art without loss of performance.
  • the invention it is thus possible to produce, by one or two molding operations, the entire structure of the housing, a structure which will provide the function of mechanical maintenance of the pyrotechnic substance, mechanical maintenance and electrical insulation of the electrodes and that of the housing of the pyrotechnic substance with respect to humidity.
  • the subject of the invention is a pyrotechnic initiator comprising a pyrotechnic substance placed inside a housing arranged in a housing made of a plastic material and closed by a plug also made of plastic material, the housing comprising a cylindrical wall
  • this initiator is characterized in that the wall has at least one window of reduced thickness, forming a single piece with the wall, and intended to break during the initiation of the substance, the stopper comprising a shoulder and an annular groove in which a thinned cylindrical end of the casing is adjusted, a clearance remaining between the shoulder of the plug and the casing so as to allow the plug to remain supported on the pyrotechnic substance during the fixing of the plug.
  • the material of the housing ensures rigidity and confinement, the presence of zones of reduced thicknesses arranged on the housing itself or else on its cap allows pyrotechnic transmission with a minimum of fragments.
  • the support of the stopper on the substance makes it possible to ensure a slight compression of the substance during the fixing of the stopper which increases the safety and the reliability of the initiator by preventing any empty space of substance inside the case.
  • the initiator comprises a means for initiating the substance disposed at the bottom of the housing, such an arrangement also makes it possible to ensure good contact between the substance and the initiation means.
  • the invention also relates to a pyrotechnic initiator comprising a pyrotechnic substance disposed inside a housing arranged in a housing made of a plastic material, and closed by a plug also made of plastic material, the housing comprising a cylindrical wall.
  • this initiator is characterized in that the plug has a zone of reduced thickness intended to break during the initiation of the substance, and comprises a shoulder and an annular groove in which is fitted a thinned cylindrical end of the housing, a play remaining between the shoulder of the plug and the casing so as to allow the plug to remain supported on the pyrotechnic substance during the fixing of the plug.
  • the reduced thickness zone is then fitted on the plug and not on the housing, such a variant makes it possible to ensure initiation in an axial direction of the housing.
  • the initiator according to this variant may also include windows of reduced thickness forming a single piece with the wall.
  • the initiation means may consist of a resistive wire, a semiconductor wafer or the end of an optical fiber.
  • the windows are arranged outside the wall, the housing then having a smooth cylindrical internal surface.
  • Such an arrangement facilitates the introduction by compression of the pyrotechnic substance in the housing.
  • the stopper has an area of reduced thickness intended to rupture during the initiation of the substance.
  • the housing is formed of a base and a skirt made integral with each other by a connecting means, the skirt carrying the wall on which the windows are made.
  • Such an embodiment makes it possible to facilitate the manufacture of the housing and in particular the fixing of the initiation means to the bottom of the housing (for example the welding of a resistive wire or of a semiconductor wafer on the electrodes).
  • the skirt has a length of between 1.5 and 2.5 times the diameter of the housing.
  • the housing may be covered with a metallization.
  • the housing may also be covered with a metal cap which covers both the plug and the cylindrical wall.
  • the initiator comprises two electrodes embedded in the material of the housing and the ends of which protrude slightly at the level of a base of the housing, the overmolding length of each electrode being between 5 and 10 times its diameter .
  • the plug will preferably be fixed to the housing by ultrasonic welding.
  • skirt and the base of the housing will be made integral with one another by ultrasonic welding.
  • the plastic material of the housing and / or the plug will preferably be of the polyamide or polycarbonate type.
  • the pyrotechnic substance is deposited in the housing by a wet loading process.
  • This loading mode ensures manufacturing safety and allows the housing of the housing to be optimally filled.
  • an initiator 1 comprises a pyrotechnic substance 2 of known type (for example an explosive (detonator) or an inflammatory pyrotechnic composition), substance disposed in a housing, 3, substantially cylindrical, which is arranged in a housing 4.
  • a pyrotechnic substance 2 of known type (for example an explosive (detonator) or an inflammatory pyrotechnic composition)
  • substance disposed in a housing, 3, substantially cylindrical, which is arranged in a housing 4.
  • Two metallic electrodes 5a, 5b pass through the housing 4, the ends 6a, 6b of which protrude slightly (by a few tenths of a mm) at the bottom 7 of the housing 3.
  • a means for initiating the pyrotechnic substance is fixed between the electrodes.
  • This means is here a resistive wire 8 which connects the electrodes 5a and 5b and which is fixed by welding on each of the ends 6a and 6b.
  • the electrical characteristics of the wire 8 are determined in a conventional manner by a person skilled in the art as a function of the pyrotechnic characteristics of the substance 2.
  • the housing 4 is made of plastic material of the Polyamide or polycarbonate type, a material possibly loaded with glass fibers to increase its mechanical strength.
  • the housing 4 is molded or injected on the electrodes 5a and 5b.
  • the latter may have roughness on their external surface to improve the attachment of the material of the housing and increase the mechanical strength of the initiator.
  • a housing 4 In order to ensure sufficient rigidity of the mounting of the electrodes in the housing (and therefore of the resistance of the resistive filament), a housing 4 will be defined such that the length of overmolding of the electrodes is sufficient, ie from 5 to 10 times the diameter of the 'electrode.
  • FIG. 4 shows a variant in which the electrodes have grooves 9 inside which the material of the housing penetrates during manufacture.
  • the housing 4 includes a bulge 17 which gives a bearing surface allowing for example its installation in a housing arranged in a pyrotechnic substance or in an initiation device not shown (housing to the diameter of the housing).
  • the cylindrical wall 10 of the housing 3 has three zones 11 whose thickness is reduced.
  • the thickness reduction is made inside the housing 3, so this thickness reduction is not visible from the outside of the initiator, the outside of the wall 10 therefore has a smooth cylindrical surface.
  • the zones 11 of reduced thickness are easily obtained during the manufacture of the housing by molding in a suitable tool. It suffices to provide a mold of which a movable part is of the desired diameter for the housing 3 and comprises three sliding fingers which will give the shape of the zones of reduced thickness 11.
  • These three zones 11 constitute fragile windows which will be broken by the pressure generated by the pyrotechnic substance during its initiation.
  • the thickness of these windows will be of the order of 0.5 to 1 mm. They therefore play the role of the initiator's closing straw according to the state of technique, but do not require an additional mounting step since they are obtained with the housing and constitute a single piece with the latter.
  • the windows 11 thus allow transmission to a pyrotechnic chain in a radial direction of the initiator.
  • the pyrotechnic substance 2 is placed by compression inside the housing 3. During this manufacturing step, it penetrates inside the zones of reduced thickness 11.
  • the mechanical strength of the windows is not affected by the compression operation despite their small thickness.
  • the external cylindrical surface of the wall 10 will be maintained during this operation in a tool of complementary shape, this tool will ensure the maintenance of the windows and will allow the compression of the pyrotechnic substance without deformation of the windows.
  • the housing 3 is closed by a plug 12.
  • the latter has a cylindrical portion 12a of reduced diameter which is adjusted in the housing 3 and a shoulder 12b.
  • the plug is made of the same material as the housing 4. It is fixed to the housing by ultrasonic welding.
  • the initiator constitutes a completely sealed assembly.
  • FIG. 3 shows the lower part of the housing in the direction X of FIG. 1 and specifies the shape of the fingers 13.
  • the initiator according to the invention can be manufactured easily and at low cost, the manufacture requiring only a few operations and each operation being simple and easily automated.
  • the filament is welded to the electrodes by means of welding techniques adapted to the wiring of integrated circuits, an inexpensive technique and allowing high production rates.
  • the substance is placed by compression directly in the housing of the housing and on the filament.
  • the plug is welded to the housing and ensures a perfect seal while increasing the mechanical rigidity of the assembly.
  • Figure 5 shows the detail of the fixing of the plug on the housing in the case of the latter embodiment.
  • the housing 4 then has at its housing 3 an annular groove 15 into which penetrates a bead 16 arranged on the cylindrical part 12a of the plug.
  • the positioning is carried out by elastic deformation.
  • the seal is completed by a deposit of varnish on the external surface of the wall 10 at the level of the separation between plug and case.
  • connection can also be completed by depositing adhesive between the shoulder 12b of the plug and the housing.
  • the zone 18 is obtained directly during the molding of the plug 12. It results from the arrangement of a cavity 19 which here has a conical profile but which could be cylindrical.
  • the cavity 19 is arranged outside the plug 12 so the zone of reduced thickness 18 comes into contact with the pyrotechnic substance 2 and performs a setting of the latter.
  • the pressure generated by the pyrotechnic substance 2 will break the zone of reduced thickness 18.
  • This last type of initiator will allow the transmission of a pyrotechnic effect to a pyrotechnic chain in an axial direction of the housing.
  • Electrodes 5a and 5b We could for example connect by welding the electrodes 5a and 5b to a semiconductor wafer, printed circuit or integrated circuit, which can itself be glued to the bottom 7 of the housing 3.
  • the plate then constitutes the means of initiation of the pyrotechnic substance.
  • the electrodes will be replaced during overmolding of the housing by a support for an optical fiber.
  • the end of the optical fiber then constitutes the means for initiating the pyrotechnic substance.
  • the substance will be a substance sensitive to photons (light intensity or shock wave).
  • photons light intensity or shock wave.
  • Such substances are known to those skilled in the art, reference may for example be made to patents FR9002566 and FR9014662 which describe such substances.
  • the box will have a first zone of reduced thickness intended to allow its passage through a striker and at least one other zone of reduced thickness, arranged on the wall of the box or on the plug, and intended to transmit the pyrotechnic effect to a pyrotechnic chain.
  • Figures 7 and 8 show a second embodiment of an initiator according to the invention.
  • the housing 4 here consists of a base 4a and a skirt 4b.
  • Base and skirt are both made of plastic material such as Polycarbonate loaded with glass fibers to increase mechanical strength. For example, a load of 10% to 40% by mass of short glass fibers (a few tenths of a millimeter long) will be adopted.
  • the base 4a has elastic fingers 13 at its lower part allowing it to be fixed, fingers identical to those described above and which will therefore not be described here in more detail.
  • the base 4a has a cylindrical central stud 20 on which the skirt 4b is adjusted.
  • the skirt is fixed to the base by ultrasonic welding, but another method of fixing could be adopted, for example gluing.
  • the ultrasonic welding is carried out in a known manner by applying a sonotrode of a welding device to the external conical surface 31 (in the directions marked S ').
  • the vibrations of the sonotrode cause the contacting surfaces to be welded, ie the external cylindrical surface of the stud and that of the skirt as well as the flat bearing surfaces 26 and 27.
  • the metal electrodes 5a and 5b pass through the base 4a and their ends 6a, 6b slightly protrude at the level of the upper face 21 of the central stud 20.
  • a resistive wire 8 is fixed by welding on each of the ends 6a and 6b.
  • the central stud 20 has two flats 22 which have the function of allowing the positioning of a tool (not shown) ensuring the welding of the resistive wire on the ends of the electrodes.
  • the base 4a is overmolded on the electrodes 5a and 5b, the overmoulding length of each electrode is between 5 and 10 times its diameter to ensure sufficient rigidity for mounting the electrodes.
  • the skirt 4b has two zones of reduced thickness forming windows 11. The thickness reduction is made outside the skirt 4b, thus the housing 3 has a smooth cylindrical internal surface.
  • the advantage of such an arrangement is that it facilitates the filling of the housing 3 with the pyrotechnic substance 2.
  • the housing 3 is completely filled, which increases the reliability of the initiator. Indeed, the presence of a space devoid of pyrotechnic substance would cause the risk of the appearance of internal friction and above all would risk causing an initiation fault if the resistive wire was not intimately in contact with the pyrotechnic substance.
  • the pyrotechnic substance 2 is placed by compression.
  • the mechanical strength of the windows 11 is ensured by a judicious choice of the compression force relative to the mechanical strength of the windows.
  • Sharing the housing 4 in two parts, a base 4a and a skirt 4b makes it easier to mount the filament 8 (or another initiation means such as a semiconductor wafer or an optical fiber).
  • the welding of the filament 8 is carried out on the base 4a equipped with the electrodes. Welding is easy to perform because the welding tool does not have to enter a cylindrical housing to reach the ends 6a and 6b.
  • the flats guide the tools, which increases the precision and speed of this operation.
  • the skirt 4b is fixed to the base 4a. This fixing will preferably be done on the same transfer machine, just after the filament welding station. This is to avoid any deterioration of the filament following manipulations of the base 4a.
  • the pyrotechnic substance is then deposited according to the known method of wet loading.
  • This substance will be mixed with 1 to 5% by mass of a binder such as natural gum or a synthetic binder and with water (5 to 30% by mass).
  • a binder such as natural gum or a synthetic binder
  • the substance is thus shaped into pellets of the diameter of the housing 3 of the housing with appropriate tools.
  • a punch ensures moderate compression (20 to 40 megapascals) of this pellet which allows the pyrotechnic substance to completely fill the housing 3 and to be in intimate contact with the filament 8.
  • Compression also drives water away from the top of the substance.
  • the charged initiators then pass through a hot tunnel (50 to 80 ° C) which causes the water to evaporate.
  • the drying of the substance has the effect of restoring its sensitivity.
  • a closure plug 12 made of a material identical to that of the housing is positioned so as to close the housing 3.
  • the plug 12 has a front face 23 which bears on the pyrotechnic substance 2.
  • the cylindrical part 12a of the plug is adjusted in the housing 3 which increases the rigidity of the housing 4 at the level of the wall 10 of the skirt 4b.
  • the plug 12 has an annular groove 24 which receives a tapered cylindrical end 25 of the skirt 4b.
  • Such an arrangement is intended to allow the fixing of the plug on the skirt (for example by ultrasonic welding) while keeping the plug in abutment on the pyrotechnic substance.
  • the ultrasonic welding is carried out in a known manner by applying a sonotrode of a welding device on a circular crown of the outer flat face of the plug, crown located substantially in line with the thinned end 25 of the skirt 4b (S marks).
  • the vibrations of the sonotrode cause the welding of the contacting surfaces, that is to say the cylindrical surfaces of the end 25 and of the groove 24.
  • the plug is welded after evaporation of the water as described above.
  • the plug 12 finally comprises a cavity 19 disposed outside the plug and which provides an area of reduced thickness 18 on the plug. This zone allows the transmission of a pyrotechnic effect in an axial direction of the initiator. It also makes it possible to ensure a rupture of the plug at a predetermined location in addition to the windows 11.
  • the external surface of the initiator is completely covered (with the exception of the surface which separates the electrodes) with a deposit, of a conductive material, for example stainless steel.
  • This deposit is implemented by the known technology of vacuum metallization by evaporation.
  • the deposition could also be carried out by spraying, sputtering or by electrodeposition.
  • Other conductive materials, in particular metallic, could be adopted, for example aluminum, chromium or nickel deposits.
  • This coating forms a Faraday cage which protects the initiator from the currents induced by the electromagnetic environment.
  • the housing 4 Due to the separation of the housing 4 into two parts, a base 4a and a skirt 4b, it is very easy to weld the resistive filament on the electrodes, and it becomes possible to put in place a skirt of considerable length without harming ease of manufacture.
  • the cylindrical part 12a thereof has a length greater than or equal to 0.5 times its diameter.
  • FIG. 7a thus shows an initiator (whose skirt is identical to that of the initiator in FIG. 7) and containing twice as much pyrotechnic substance 2. This initiator is then closed by a plug whose cylindrical part 12a is twice shorter.
  • the skirt 4b will be given a total length L of between 1.5 and 2.6 times the diameter of the housing 3 (and preferably equal to 2 times the diameter).
  • FIG 9 shows a last embodiment of the invention in which the housing 4 is similar to that shown in Figures 7 and 8 and has a base 4a and a skirt 4b. This box will therefore not be described in more detail.
  • This cap is made of brass a few tenths of a millimeter thick, which is covered with chrome to prevent corrosion. It completely surrounds the plug 12 and the skirt 4b, and comes to bear at its end on an abutment surface 29 of the base 4a.
  • the cap 28 is pierced with circular openings 30 arranged opposite the windows 11. It is force-fitted on the housing (tight fit on the external cylindrical surface of the housing obtained for example by giving a slightly conical profile inside the cap ).
  • the function of the cap is to complete the Faraday cage surrounding the pyrotechnic initiator. There is thus an electrical contact with the metallization which covers the housing 4.
  • the cap 28 holds the different pieces of the housing and prevents their dispersion in the pyrotechnic system initiated. This increases the reliability of the initiator by ensuring in all cases that a fragment of the housing will not disturb the operation of the system initiated.
  • Such an arrangement is particularly useful for high security applications, for example the initiation of automobile safety airbags. It is thus certain that fragments of the housing will not block the inflation orifices of the cushion, seriously impairing its effectiveness.
  • the initiator does not have a window on the housing but an area of reduced thickness on the plug (in order to ensure ignition in an axial direction of the housing), only one cap will be provided opening arranged opposite the zone of reduced thickness of the plug.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Manufacturing Of Micro-Capsules (AREA)
  • Lighters Containing Fuel (AREA)

Claims (15)

  1. Pyrotechnischer Zünder (1) mit einer pyrotechnischen Substanz (2), die im Inneren eines Hohlraums (3) untergebracht wird, der im Gehäuse (4) angelegt wird, das aus Kunststoff besteht und von einem Stopfen (12) ebenfalls aus Kunststoff verschlossen wird, bei dem der Hohlraum eine zylindrische Wand (10) hat, gekennzeichnet dadurch, daß die Wand mindestens ein Fenster (11) mit verminderter Stärke aufweist, das mit der Wand ein einziges Stück bildet, und das dazu bestimmt ist, beim Zünden der Substanz (2) zu bersten, während der Stopfen einen Ansatz (12b) enthält sowie eine ringförmige Hohlkehle (24), in die das verdünnte zylindrische Ende (25) des Gehäuses (4) gepaßt ist, während zwischen dem Ansatz (12b) des Stopfens und dem Gehäuse (4) ein Spiel (j) frei bleibt, so daß während des Befestigens des Stopfens das Andrücken des Stopfens an die pyrotechnische Substanz erlaubt wird.
  2. Pyrotechnischer Zünder (1) mit einer pyrotechnischen Substanz (2) im Inneren eines Hohlraums (3), der im Gehäuse (4) aus Kunststoff eingerichtet ist, verschlossen durch einen Stopfen (12), der ebenfalls aus Kunststoff besteht, während der Hohlraum eine zylindrische Wand (10) aufweist, gekennzeichnet dadurch, daß der Stopfen (12) eine Zone mit verminderter Stärke (18) enthält, die beim Zünden der Substanz (2) bersten soll und einen Ansatz (12b) und eine ringförmige Hohlkehle (24) umfaßt, in die das zylindrische verdünnte Ende (25) des Gehäuses (4) gepaßt ist, während zwischen dem Ansatz (12b) des Stopfens und dem Gehäuse (4) ein Spiel (j) frei bleibt, so daß während des Befestigens des Stopfens das Andrücken des Stopfens an die pyrotechnische Substanz erlaubt wird.
  3. Zünder gemäß dem Anspruch 2, gekennzeichnet dadurch, daß die zylindrische Wand (10) mindestens ein Fenster (11) mit verminderter Stärke aufweist, das mit besagter Wand ein einziges Stück bildet und dazu bestimmt ist, beim Zünden der pyrotechnischen Substanz (2) zu bersten.
  4. Zünder gemäß dem Anspruch 1, gekennzeichnet dadurch, daß die Fenster (11) an der äußeren Fläche der Wand (10) angebracht sind, während der Hohlraum eine glatte zylindrische Innenfläche aufweist.
  5. Zünder gemäß einem der Ansprüche 1 oder 4, gekennzeichnet dadurch, daß der Stopfen (12) eine Zone mit verminderter Stärke (18) aufweist, die beim Zünden der Substanz (2) bersten soll.
  6. Zünder gemäß einem der Ansprüche 1, 3, 4 oder 5, gekennzeichnet dadurch, daß das Gehäuse (4) aus einer Basis (4a) und einer Schürze (4b) gebildet wird, die miteinander durch ein Verbindungsmittel fest verbunden werden, während die Schürze (4b) die Wand trägt, in der die Fenster (11) angelegt werden.
  7. Zünder gemäß dem Anspruch 6, gekennzeichnet dadurch, daß die Schürze (4b) eine Länge zwischen 1,5 und 2,5 Mal dem Durchmesser des Hohlraums (3) aufweist.
  8. Zünder gemäß einem der Ansprüche 1 bis 7, gekennzeichnet dadurch, daß das Gehäuse (4) mit einer Metallisierung beschichtet wird.
  9. Zünder gemäß einem der Ansprüche 1 bis 8, gekennzeichnet dadurch, daß das Gehäuse (4) mit einer Metallkappe (28) überzogen ist, die gleichzeitig den Stopfen (12) und die zylindrische Wand (10) umschließt.
  10. Zünder gemäß einem der Ansprüche 1 bis 9, gekennzeichnet dadurch, daß er zwei Elektroden (5a, 5b) enthält, die in den Werkstoff des Gehäuses (4) eingelassen sind, und deren Enden (6a, 6b) auf der Ebene einer Basis (7) des Hohlraums (3) leicht hervorstehen, wobei die Abformlänge jeder Elektrode zwischen 5 und 10 Mal ihrem Durchmessermaß liegt.
  11. Zünder gemäß einem der Ansprüche 1 bis 10, gekennzeichnet dadurch, daß der Stopfen (12) durch Ultraschallschweißung auf dem Gehäuse (4) befestigt ist.
  12. Zünder gemäß einem der Ansprüche 6 bis 11, gekennzeichnet dadurch, daß die Schürze (4b) und die Basis (4a) des Gehäuses (4) durch Ultraschallschweißung miteinander verbunden werden.
  13. Zünder gemäß einem der Ansprüche 1 bis 12, gekennzeichnet dadurch, daß der Kunststoff des Gehäuses (4) und / oder des Stopfens (12) aus Polyamid oder Polycarbonat bestehen.
  14. Zünder gemäß dem Anspruch 13, gekennzeichnet dadurch, daß der Kunststoff des Gehäuses (4) und / oder des Stopfens (12) aus Polycarbonat mit Glasfaserverstärkung besteht.
  15. Zünder gemäß einem der Ansprüche 1 bis 14, gekennzeichnet dadurch, daß die pyrotechnische Substanz (2) im Gehäuse (4) anhand eines Naßbeschickungsverfahrens eingebracht wird.
EP93402906A 1992-12-01 1993-12-01 Pyrotechnische elektrische Anzünder Expired - Lifetime EP0600791B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9214473A FR2698687B1 (fr) 1992-12-01 1992-12-01 Initiateur pyrotechnique.
FR9214473 1992-12-01

Publications (2)

Publication Number Publication Date
EP0600791A1 EP0600791A1 (de) 1994-06-08
EP0600791B1 true EP0600791B1 (de) 1997-02-05

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EP93402906A Expired - Lifetime EP0600791B1 (de) 1992-12-01 1993-12-01 Pyrotechnische elektrische Anzünder

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US (1) US5423261A (de)
EP (1) EP0600791B1 (de)
AT (1) ATE148783T1 (de)
DE (1) DE69308004T2 (de)
ES (1) ES2096891T3 (de)
FR (1) FR2698687B1 (de)

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DE69308004T2 (de) 1997-06-05
EP0600791A1 (de) 1994-06-08
ES2096891T3 (es) 1997-03-16
ATE148783T1 (de) 1997-02-15
DE69308004D1 (de) 1997-03-20
FR2698687A1 (fr) 1994-06-03
FR2698687B1 (fr) 1995-02-03
US5423261A (en) 1995-06-13

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