EP1407217A1 - Pyrotechnical primer - Google Patents
Pyrotechnical primerInfo
- Publication number
- EP1407217A1 EP1407217A1 EP01951202A EP01951202A EP1407217A1 EP 1407217 A1 EP1407217 A1 EP 1407217A1 EP 01951202 A EP01951202 A EP 01951202A EP 01951202 A EP01951202 A EP 01951202A EP 1407217 A1 EP1407217 A1 EP 1407217A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- charge
- intermediate layer
- primer
- ignition
- elastic intermediate
- 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.)
- Withdrawn
Links
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
- F42B3/195—Manufacture
- F42B3/198—Manufacture of electric initiator heads e.g., testing, machines
-
- 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
- F42B3/124—Bridge initiators characterised by the configuration or material of the bridge
Definitions
- the present invention relates to a pyrotechnic igniter with a glow bridge, an ignition charge and an amplifier charge.
- Pyrotechnic igniters are used in large numbers in the automotive industry, where they are used to ignite gas generators for airbags and seat belt tensioners.
- a glow bridge is provided which ignites an ignition charge when it is made to glow by means of electric current. It is important that the glow plug touches the ignition charge. Even a small air gap can be enough for the primer to no longer ignite. For this reason, the parts of the igniter are pressed into the housing, whereupon the housing is closed, so that the high pressure is maintained. Despite this pressure, there is no direct contact between the ignition charge and the glow plug. This is primarily due to the strong temperature fluctuations that occur inside motor vehicles.
- a detonator is e.g. described in WO 94/10528 A1.
- a paper or ylar disk can be provided between the primer charge and the primer housing.
- This object is achieved in that an elastic intermediate layer is provided between the primer charge and the booster charge, which is compressed due to the pressure inside the igniter. Due to its elasticity, the intermediate layer can compensate for all temperature-related length fluctuations. It also ensures that the ignition charge and the booster charge remain cleanly separated and cannot mix.
- the primer charge develops so much energy that it can easily break through the intermediate layer and ignite the booster charge. As a result of the elasticity of the intermediate layer, a lower press-in force is sufficient, so that more sensitive primers can be processed.
- WO 94/10528 is not appreciably elastically compressible, so that it cannot count as an "elastic intermediate layer" according to the present patent claim 1.
- the paper or mylar disc is only used to avoid reactions between sets, but it has no elastic properties.
- the elastic intermediate layer is a plastic with a honeycomb structure.
- a plastic with a honeycomb-like structure can be pressed together transversely to the axial direction of the honeycomb with relatively little force, which is highly desirable in the present application.
- the igniter 1 has a housing 8.
- An electronics block 9 is located in this housing 8.
- This electronics block 9 carries a glow bridge 2 on the outside. This is connected to electronic components (not shown) via connecting wires 6 and 7.
- the electronic components are supplied with energy and / or information signals from the outside via connecting wires, not shown.
- the electronics block 9 can - as is known per se - consist of an electronic circuit which is cast in synthetic resin.
- the ignition charge 3 is connected to the electronics block 9. This is followed by the booster charge 5, whereby according to the invention an elastic intermediate layer 4 is provided between the firing charge 3 and the booster charge 5, which was pressed together during manufacture of the igniter.
- This intermediate layer 4 therefore permanently presses the ignition charge 3 firmly against the glow bridge 2, so that no intermediate space can arise. This ensures that the ignition charge 3 is reliably ignited by the glow bridge 2.
- the ignition charge 3 develops sufficient energy to break through the elastic intermediate layer 4 and ignite the booster charge 5. Because the elastic intermediate layer 4 is applied between the ignition charge 3 and the booster charge 5, an additional separating layer between these two charges is not necessary. In addition, the contact pressure is higher than if an elastic layer were applied at the very bottom (as seen in FIG. 1) of the housing 8.
- a suitable material for the intermediate layer 4 is silicone, but can also be found in different plastic structures which remain elastic over a larger temperature range. So that the intermediate layer 4 is particularly elastic, it can have a honeycomb structure, the axis of the honeycomb lying horizontally (as seen in FIG. 1).
Abstract
The invention relates to a pyrotechnical primer comprising a heating filament (2), an ignition charge (3) and an amplifying charge (5). According to the invention, an elastic intermediate layer (4) is provided between the ignition charge (3) and the amplifying charge (5), said layer being compressed due to pressure inside the primer. The ignition charge (3) is thus continuously pressed against the heating filament (2) so that a highly reliable ignition system is provided. The elastic intermediate layer (4) can be made of plastic with a honeycomb structure.
Description
"Pyrotechnischer Zünder" "Pyrotechnic detonator"
TECHNISCHES GEBIETTECHNICAL AREA
Die vorliegende Erfindung betrifft einen pyrotechnischen Zünder mit einer Glühbrücke, einer Anzündladung und einer Verstärkerladung .The present invention relates to a pyrotechnic igniter with a glow bridge, an ignition charge and an amplifier charge.
STAND DER TECHNIKSTATE OF THE ART
Pyrotechnische Zünder werden in großer Anzahl in der Kfz- Industrie verwendet, wo sie zum Zünden von Gasgeneratoren von Airbags und Sicherheitsgurtstraffern dienen. Es ist dabei eine Glühbrücke vorgesehen, die eine Anzündladung zündet, wenn sie mittels elektrischem Strom zum Glühen gebracht wird. Wichtig ist dabei, dass die Glühbrücke die Anzündladung berührt. Selbst ein geringer Luftspalt kann bereits ausreichen, dass die Anzündladung nicht mehr zündet. Aus diesem Grund werden die Teile des Zünders in das Gehäuse eingepresst, worauf man das Gehäuse verschließt, sodass der hohe Druck erhalten bleibt. Trotz dieses Drucks kommt es vor, dass kein unmittelbarer Kontakt zwischen Anzündladung und Glühbrücke besteht. Dafür sind in erster Linie die starken Temperaturschwankungen verantwortlich, die im Inneren von Kraftfahrzeugen auftreten.Pyrotechnic igniters are used in large numbers in the automotive industry, where they are used to ignite gas generators for airbags and seat belt tensioners. A glow bridge is provided which ignites an ignition charge when it is made to glow by means of electric current. It is important that the glow plug touches the ignition charge. Even a small air gap can be enough for the primer to no longer ignite. For this reason, the parts of the igniter are pressed into the housing, whereupon the housing is closed, so that the high pressure is maintained. Despite this pressure, there is no direct contact between the ignition charge and the glow plug. This is primarily due to the strong temperature fluctuations that occur inside motor vehicles.
Solch ein Zünder ist z.B. in der WO 94/10528 A1 beschrieben. Gemäß Seite 8, Zeilen 17 bis 20 dieser Schrift kann eine Papier- oder ylarscheibe zwischen der Zündladung und dem Zündergehäuse vorgesehen sein.Such a detonator is e.g. described in WO 94/10528 A1. According to page 8, lines 17 to 20 of this document, a paper or ylar disk can be provided between the primer charge and the primer housing.
OFFENBARUNG DER ERFINDUNGDISCLOSURE OF THE INVENTION
Es ist Aufgabe der vorliegenden Erfindung, einen Zünder der eingangs genannten Art so zu verbessern, dass seine Zündsicherheit erhöht wird.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass zwischen der Anzündladung und der Verstärkerladung eine elastische Zwischenschicht vorgesehen ist, die auf Grund des Drucks im Inneren des Zünders zusammengedrückt ist. Die Zwischenschicht kann auf Grund ihrer Elastizität alle temperaturbedingten Längenschwankungen ausgleichen. Außerdem sorgt sie dafür, dass die Anzündladung und die Verstärker— ladung sauber getrennt bleiben und sich nicht vermischen können. Die Anzündladung entwickelt so viel Energie, dass sie die Zwischenschicht problemlos durchschlagen und die Verstärkerladung zünden kann. Infolge der Elastizität der Zwischenschicht kommt man mit einer geringeren Einpresskraft aus, so- dass empfindlichere Zündsätze verarbeitet werden können.It is an object of the present invention to improve an igniter of the type mentioned at the outset in such a way that its ignition reliability is increased. This object is achieved in that an elastic intermediate layer is provided between the primer charge and the booster charge, which is compressed due to the pressure inside the igniter. Due to its elasticity, the intermediate layer can compensate for all temperature-related length fluctuations. It also ensures that the ignition charge and the booster charge remain cleanly separated and cannot mix. The primer charge develops so much energy that it can easily break through the intermediate layer and ignite the booster charge. As a result of the elasticity of the intermediate layer, a lower press-in force is sufficient, so that more sensitive primers can be processed.
Im Gegensatz zu der erfindungsgemäßen elastischen Zwischen- schicht ist die Papier— oder Mylarscheibe gemäß derIn contrast to the elastic intermediate layer according to the invention, the paper or mylar disc according to the
WO 94/10528 nicht nennenswert elastisch zusammendrückbar, so dass sie nicht als "elastische Zwischenschicht" gemäß dem vorliegenden Patentanspruch 1 gelten kann. Die Papier— oder Mylarscheibe dient nur dazu, um Reaktionen zwischen den Sätzen zu vermeiden, sie hat jedoch keine elastischen Eigenschaften .WO 94/10528 is not appreciably elastically compressible, so that it cannot count as an "elastic intermediate layer" according to the present patent claim 1. The paper or mylar disc is only used to avoid reactions between sets, but it has no elastic properties.
Es ist zweckmäßig, wenn die elastische Zwischenschicht ein Kunststoff mit wabenartiger Struktur ist. Ein Kunststoff mit wabenartiger Struktur lässt sich quer zur Achsrichtung der Waben mit relativ wenig Kraft stark zusammenpressen, was im vorliegenden Anwendungsfall höchst erwünscht ist.It is expedient if the elastic intermediate layer is a plastic with a honeycomb structure. A plastic with a honeycomb-like structure can be pressed together transversely to the axial direction of the honeycomb with relatively little force, which is highly desirable in the present application.
KURZE BESCHREIBUNG DER ZEICHNUNGBRIEF DESCRIPTION OF THE DRAWING
Anhand der beiliegenden Zeichnung wird die vorliegende Erfindung näher erläutert. Die einzige Figur zeigt einen erfindungsgemäßen Zünder im Schnitt.The present invention is explained in more detail with reference to the accompanying drawing. The single figure shows a detonator according to the invention in section.
BESTE AUSFÜHRUNGSFORM DER ERFINDUNGBEST EMBODIMENT OF THE INVENTION
Der Zünder 1 weist ein Gehäuse 8 auf. In diesem Gehäuse 8 befindet sich ein Elektronikblock 9. Dieser Elektronikblock 9
trägt außen eine Glühbrücke 2. Diese steht über Verbindungsdrähte 6 und 7 mit elektronischen Bauteilen (nicht dargestellt) in Verbindung. Die elektronischen Bauteile werden über nicht dargestellte Anschlussdrähte von außen mit Energie und/oder Informationssignalen versorgt. Der Elektronikblock 9 kann - wie an sich bekannt - aus einer elektronischen Schaltung bestehen, die in Kunstharz eingegossen ist.The igniter 1 has a housing 8. An electronics block 9 is located in this housing 8. This electronics block 9 carries a glow bridge 2 on the outside. This is connected to electronic components (not shown) via connecting wires 6 and 7. The electronic components are supplied with energy and / or information signals from the outside via connecting wires, not shown. The electronics block 9 can - as is known per se - consist of an electronic circuit which is cast in synthetic resin.
Anschließend an den Elektronikblock 9 befindet sich die Anzündladung 3. Daran schließt die Verstärkerladung 5 an, wobei erfindungsgemäß zwischen der Anzündladung 3 und der Verstärkerladung 5 eine elastische Zwischenschicht 4 vorgesehen ist, die während der Herstellung des Zünders zusammengepresst worden ist. Diese Zwischenschicht 4 presst daher die Anzündladung 3 ständig fest an die Glühbrücke 2 an, sodass kein Zwi— schenraum entstehen kann. Damit ist gewährleistet, dass die Anzündladung 3 zuverlässig von der Glühbrücke 2 gezündet wird. Die Anzündladung 3 entwickelt ausreichend viel Energie, um die elastische Zwischenschicht 4 zu durchschlagen und die Verstärkerladung 5 zu zünden. Dadurch, dass die elastische Zwischenschicht 4 zwischen der Anzündladung 3 und der Verstärkerladung 5 angebracht ist, erübrigt sich eine zusätzliche Trennschicht zwischen diesen beiden Ladungen. Außerdem ist die Anpresswirkung höher, als wenn man eine elastische Schicht ganz unten (wie in Fig. 1 gesehen) des Gehäuses 8 anbringen würde.The ignition charge 3 is connected to the electronics block 9. This is followed by the booster charge 5, whereby according to the invention an elastic intermediate layer 4 is provided between the firing charge 3 and the booster charge 5, which was pressed together during manufacture of the igniter. This intermediate layer 4 therefore permanently presses the ignition charge 3 firmly against the glow bridge 2, so that no intermediate space can arise. This ensures that the ignition charge 3 is reliably ignited by the glow bridge 2. The ignition charge 3 develops sufficient energy to break through the elastic intermediate layer 4 and ignite the booster charge 5. Because the elastic intermediate layer 4 is applied between the ignition charge 3 and the booster charge 5, an additional separating layer between these two charges is not necessary. In addition, the contact pressure is higher than if an elastic layer were applied at the very bottom (as seen in FIG. 1) of the housing 8.
Ein geeignetes Material für die Zwischenschicht 4 ist Silikon, kann aber auch in unterschiedlichen KunststoffStrukturen gefunden werden, welche über einen größeren Temperaturbereich elastisch bleiben. Damit die Zwischenschicht 4 besonders elastisch ist, kann sie eine wabenartige Struktur aufweisen, wobei die Achse der Waben waagerecht (so wie ihn Fig. 1 gesehen) liegt.
A suitable material for the intermediate layer 4 is silicone, but can also be found in different plastic structures which remain elastic over a larger temperature range. So that the intermediate layer 4 is particularly elastic, it can have a honeycomb structure, the axis of the honeycomb lying horizontally (as seen in FIG. 1).
Claims
PATENTANSPRÜCHE : PATENT CLAIMS:
Pyrotechnischer Zünder mit einer Glühbrücke (2), einer Anzündladung (3) und einer Verstärkerladung (5), dadurch gekennzeichnet, dass zwischen der Anzündladung (3) und der Verstärkerladung (5) eine elastische Zwischenschicht (4) vorgesehen ist, die auf Grund des Drucks im Inneren des Zünders zusammengedrückt ist.Pyrotechnic igniter with a glow plug (2), an ignition charge (3) and a booster charge (5), characterized in that an elastic intermediate layer (4) is provided between the firing charge (3) and the booster charge (5) Pressure inside the igniter is compressed.
Zünder nach Anspruch 1 , dadurch gekennzeichnet, dass die elastische Zwischenschicht (4) ein Kunststoff mit wabenartiger Struktur ist.
Detonator according to claim 1, characterized in that the elastic intermediate layer (4) is a plastic with a honeycomb structure.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/AT2001/000237 WO2003008896A1 (en) | 2001-07-13 | 2001-07-13 | Pyrotechnical primer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1407217A1 true EP1407217A1 (en) | 2004-04-14 |
Family
ID=3619082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01951202A Withdrawn EP1407217A1 (en) | 2001-07-13 | 2001-07-13 | Pyrotechnical primer |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1407217A1 (en) |
| WO (1) | WO2003008896A1 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR660081A (en) * | 1928-09-07 | 1929-07-06 | Electric blaster for mines | |
| US3135200A (en) * | 1964-05-27 | 1964-06-02 | Hi Shear Corp | Squib |
| US3906858A (en) * | 1974-07-30 | 1975-09-23 | Us Eneregy Research And Dev Ad | Miniature igniter |
| US5454320A (en) | 1992-10-23 | 1995-10-03 | Quantic Industries, Inc. | Air bag initiator |
| JP2700100B2 (en) * | 1993-05-28 | 1998-01-19 | 日本工機株式会社 | Igniter |
| JP2000292100A (en) * | 1999-04-09 | 2000-10-20 | Showa Kinzoku Kogyo Kk | Electric ignition type gas generator |
-
2001
- 2001-07-13 WO PCT/AT2001/000237 patent/WO2003008896A1/en not_active Application Discontinuation
- 2001-07-13 EP EP01951202A patent/EP1407217A1/en not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO03008896A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2003008896A1 (en) | 2003-01-30 |
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| 18D | Application deemed to be withdrawn |
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