WO2021170491A1 - Covering of an airbag ejection channel - Google Patents

Covering of an airbag ejection channel Download PDF

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Publication number
WO2021170491A1
WO2021170491A1 PCT/EP2021/054087 EP2021054087W WO2021170491A1 WO 2021170491 A1 WO2021170491 A1 WO 2021170491A1 EP 2021054087 W EP2021054087 W EP 2021054087W WO 2021170491 A1 WO2021170491 A1 WO 2021170491A1
Authority
WO
WIPO (PCT)
Prior art keywords
material web
airbag
openings
firing channel
flap
Prior art date
Application number
PCT/EP2021/054087
Other languages
German (de)
French (fr)
Inventor
Albert Roring
Rembert Schulze Wehninck
Original Assignee
K.L. Kaschier- Und Laminier Gmbh
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
Application filed by K.L. Kaschier- Und Laminier Gmbh filed Critical K.L. Kaschier- Und Laminier Gmbh
Priority to CN202180010354.2A priority Critical patent/CN115003561A/en
Priority to EP21707208.1A priority patent/EP4110655A1/en
Publication of WO2021170491A1 publication Critical patent/WO2021170491A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
    • B60R21/215—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components characterised by the covers for the inflatable member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
    • B60R21/215—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components characterised by the covers for the inflatable member
    • B60R2021/21537—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components characterised by the covers for the inflatable member characterised by hinges

Definitions

  • the invention relates to a cover of an airbag firing channel with an airbag flap formed by the cover, which tears open on three sides by the triggered airbag cushion and pivots around the fourth side forming a hinge point, the airbag flap having a material web on the inside as a flap support wall that extends beyond the hinge point a wall of the firing channel extends on the inside.
  • the object of the invention is to improve a cover of the type mentioned at the outset in such a way that the material web has a firm, permanent connection with the airbag flap and the firing channel wall.
  • the material web has numerous openings which are penetrated by the plastic of the firing channel wall and / or the airbag flap in order to achieve a positive fit between the material web and the plastic of the firing channel wall.
  • the plastic melt penetrates the airbag flap and the firing channel wall through the openings in the material web, so that an inseparable, Positive connection is achieved, which cannot be released by the high forces of the airbag cushion acting on the airbag flap.
  • the openings are U-, L-, T- or double-T-shaped.
  • the form fit between the plastic and the material web is further increased if the edge of the openings in the material web protrudes from the surface of the material web to one side or to both sides.
  • a further improvement in the form fit is achieved if at least one projection, in particular a tongue, is formed on the edge of the openings in the material web and protrudes from the surface of the material web.
  • a further advantageous embodiment is provided when the end of the material web facing away from the airbag flap forms a fold, the fold line of which runs parallel to the axis of rotation of the hinge point and which is located within the plastic material of the firing channel wall, the fold line of the material web being interrupted by numerous openings that are opened by the Plastic of the firing channel wall are penetrated.
  • the openings in the fold line should be regularly arranged at equal intervals.
  • the function of the hinge point of enabling the airbag flap to pivot and thereby preventing the airbag flap from tearing off is improved by the fact that the material web forms a fold in the area of the hinge point. It is also proposed that the material web has a woven or knitted fabric made of polypropylene or polyester, which is covered on both sides by a thermoplastic composite material.
  • the airbag firing channel 1 surrounds an airbag cushion (not shown) with firing channel walls 5 and with at least one airbag flap 2 on the outside is covered by an outer cover 10, which has a foam layer and carries an outer skin, which tear open with.
  • One or two flaps 2, which cover the airbag cushion, are incorporated in the plate-shaped airbag cover in such a way that predetermined breaking lines 9 are arranged on three edges of each flap within the cover plate, which penetrate the entire plate and release the flap 2 after the airbag cushion has been triggered .
  • the airbag flap 2, together with the firing channel walls 5, is injection-molded from plastic, with a material web 4 lying in the injection mold, which is encapsulated by the plastic melt, so that the material web 4 lies within the plastic of a firing channel wall and the airbag flap 2 is close to the firing channel 1 .
  • the material web 4 runs through the hinge point 3 of the airbag flap.
  • the material web 4 has numerous openings 6 which are penetrated by the plastic of the firing channel wall 5 and / or the airbag flap 2 in order to achieve a positive fit between the material web and the plastic of the firing channel wall. These openings 6 are preferably also located in the area of the hinge point 3 of the material web.
  • the openings 6 can be U-, L-, T- or double-T-shaped and create a form fit that is further increased by
  • the openings 6 in the material web and in the fold line 8 of a fold 7 at the lower end of the material web 4 located in the firing channel wall 5 are preferably arranged at equal intervals.
  • the material web 4 has a woven or knitted fabric made of polypropylene or polyester, which is covered on both sides by a thermoplastic composite material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)

Abstract

The invention relates to a covering of an airbag ejection channel with an airbag flap formed by the covering, which airbag flap tears open on three sides as a result of the airbag deployment and pivots about the fourth side forming a hinge point, the airbag flap having a material web on the inner side as a flap support wall, which material web extends on the inner side over a wall of the ejection channel beyond the hinge point, the material web having numerous openings which are penetrated by the plastic of the ejection channel wall and/or the airbag flap in order to achieve a form fit between the material web and the plastic of the ejection channel wall.

Description

Abdeckung eines Airbagschusskanals Cover of an airbag firing channel
Die Erfindung betrifft eine Abdeckung eines Airbagschusskanals mit einer von der Abdeckung gebildeten Airbagklappe, die durch das ausgelöste Airbagkissen dreiseitig aufreißt und um die vierte, eine Gelenkstelle bildende Seite verschwenkt, wobei die Airbagklappe innenseitig eine Materialbahn als Klappenstützwand aufweist, die sich über die Gelenkstelle hinaus über eine Wand des Schusskanals innenseitig erstreckt. The invention relates to a cover of an airbag firing channel with an airbag flap formed by the cover, which tears open on three sides by the triggered airbag cushion and pivots around the fourth side forming a hinge point, the airbag flap having a material web on the inside as a flap support wall that extends beyond the hinge point a wall of the firing channel extends on the inside.
Aus der EP 2727775 A2 ist es bekannt, eine Materialbahn in den Kunststoff einer Airbagklappe und einer Schusskanalwand einzubetten. Hierbei hat es sich gezeigt, dass aufgrund der durch das Airbagkissen erzeugten hohen Kräfte die Materialbahn sich von der Airbagklappe und/oder von der Schusskanalwand lösen kann und damit die Airbagklappe zwar aufklappt aber nicht sicher gehalten ist. From EP 2727775 A2 it is known to embed a material web in the plastic of an airbag flap and a firing channel wall. It has been shown here that, due to the high forces generated by the airbag cushion, the material web can detach itself from the airbag flap and / or from the firing channel wall and thus the airbag flap is indeed opened but is not held securely.
Aufgabe der Erfindung ist es, eine Abdeckung der eingangs genannten Art so zu verbessern, dass die Materialbahn eine feste, unlösbare Verbindung mit der Airbagklappe und der Schusskanalwand aufweist. The object of the invention is to improve a cover of the type mentioned at the outset in such a way that the material web has a firm, permanent connection with the airbag flap and the firing channel wall.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Materialbahn zahlreiche Öffnungen aufweist, die vom Kunststoff der Schusskanalwand und/oder der Airbagklappe durchdrungen sind, um einen Formschluss zwischen der Materialbahn und dem Kunststoff der Schusskanalwand zu erreichen. This object is achieved according to the invention in that the material web has numerous openings which are penetrated by the plastic of the firing channel wall and / or the airbag flap in order to achieve a positive fit between the material web and the plastic of the firing channel wall.
Bei der Herstellung durchdringt die Kunststoffschmelze der Airbagklappe und der Schusskanalwand die Öffnungen der Materialbahn, so dass eine unlösbare, formschlüssige Verbindung erreicht wird, die auch nicht durch die auf die Airbagklappe wirkenden hohen Kräfte des Airbagkissens gelöst werden kann. During production, the plastic melt penetrates the airbag flap and the firing channel wall through the openings in the material web, so that an inseparable, Positive connection is achieved, which cannot be released by the high forces of the airbag cushion acting on the airbag flap.
Vorzugsweise wird vorgeschlagen, dass die Öffnungen U-, L-, T- oder Doppel-T- förmig sind. It is preferably proposed that the openings are U-, L-, T- or double-T-shaped.
Der Formschluss zwischen dem Kunststoff und der Materialbahn wird noch erhöht, wenn der Rand der Öffnungen der Materialbahn aus der Fläche der Materialbahn zur einen Seite oder zu beiden Seiten vorsteht. Eine weitere Verbesserung des Formschlusses wird erreicht, wenn am Rand der Öffnungen der Materialbahn mindestens ein Vorsprung insbesondere eine Zunge angeformt ist, die aus der Fläche der Materialbahn vorsteht. The form fit between the plastic and the material web is further increased if the edge of the openings in the material web protrudes from the surface of the material web to one side or to both sides. A further improvement in the form fit is achieved if at least one projection, in particular a tongue, is formed on the edge of the openings in the material web and protrudes from the surface of the material web.
Eine weitere vorteilhafte Ausgestaltung ist gegeben, wenn das der Airbagklappe abgewandte Ende der Materialbahn eine Faltung bildet, deren Faltlinie parallel zur Drehachse der Gelenkstelle verläuft und die sich innerhalb des Kunststoffmaterials der Schusskanalwand befindet, wobei die Faltlinie der Materialbahn durch zahlreiche Öffnungen unterbrochen ist, die vom Kunststoff der Schusskanalwand durchdrungen sind. Hierbei sollten die Öffnungen in der Faltlinie regelmäßig in gleichen Abständen angeordnet sein. A further advantageous embodiment is provided when the end of the material web facing away from the airbag flap forms a fold, the fold line of which runs parallel to the axis of rotation of the hinge point and which is located within the plastic material of the firing channel wall, the fold line of the material web being interrupted by numerous openings that are opened by the Plastic of the firing channel wall are penetrated. The openings in the fold line should be regularly arranged at equal intervals.
Die Funktion der Gelenkstelle, ein Verschwenken der Airbagklappe zu ermöglichen und hierbei ein Abreißen der Airbagklappe zu verhindern, wird dadurch verbessert, dass im Bereich der Gelenkstelle die Materialbahn eine Faltung bildet. Ferner wird vorgeschlagen, dass die Materialbahn ein Gewebe oder Gewirke aus Polypropylen oder Polyester aufweist, das beidseitig von einem thermoplastischen Verbundwerkstoff bedeckt ist. The function of the hinge point of enabling the airbag flap to pivot and thereby preventing the airbag flap from tearing off is improved by the fact that the material web forms a fold in the area of the hinge point. It is also proposed that the material web has a woven or knitted fabric made of polypropylene or polyester, which is covered on both sides by a thermoplastic composite material.
Ein Ausführungsbeispiel der erfindungsgemäßen Lösung ist in der Zeichnung in einem Querschnitt schematisch dargestellt und wird im Folgenden näher beschrieben. An embodiment of the solution according to the invention is shown schematically in the drawing in a cross section and is described in more detail below.
Der Airbagschusskanal 1 umgibt ein nicht dargestelltes Airbagkissen mit Schusskanalwänden 5 und mit mindestens einer Airbagklappe 2, die außenseitig von einer Außenabdeckung 10 überdeckt ist, die eine Schaumschicht aufweist und eine Außenhaut trägt, die mit aufreißen. The airbag firing channel 1 surrounds an airbag cushion (not shown) with firing channel walls 5 and with at least one airbag flap 2 on the outside is covered by an outer cover 10, which has a foam layer and carries an outer skin, which tear open with.
In der plattenförmigen Airbagabdeckung sind eine oder zwei Klappen 2, die das Airbagkissen bedecken, in der Weise eingebracht, dass innerhalb der Abdeckungsplatte an drei Rändern jeder Klappe Sollbruchlinien 9 angeordnet sind, die die gesamte Platte durchdringen und nach dem Auslösen des Airbagkissens die Klappe 2 freigeben. An dem vierten Rand befindet sich eine längliche Gelenkstelle 3 mit einem Scharnier, um den die Klappe 2 nach dem Auslösen verschwenkt ohne abzureißen. One or two flaps 2, which cover the airbag cushion, are incorporated in the plate-shaped airbag cover in such a way that predetermined breaking lines 9 are arranged on three edges of each flap within the cover plate, which penetrate the entire plate and release the flap 2 after the airbag cushion has been triggered . On the fourth edge there is an elongated hinge point 3 with a hinge around which the flap 2 swivels after being triggered without tearing off.
Die Airbagklappe 2 ist zusammen mit den Schusskanalwänden 5 im Spritzguss aus Kunststoff hergestellt, wobei in der Spritzgussform eine Materialbahn 4 einliegt, die von der Kunststoffschmelze umspritzt wird, so dass die Materialbahn 4 innerhalb des Kunststoffs einer Schusskanalwand und der Airbagklappe 2 nahe des Schusskanals 1 einliegt. Hierbei durchläuft die Materialbahn 4 die Gelenkstelle 3 der Airbagklappe. The airbag flap 2, together with the firing channel walls 5, is injection-molded from plastic, with a material web 4 lying in the injection mold, which is encapsulated by the plastic melt, so that the material web 4 lies within the plastic of a firing channel wall and the airbag flap 2 is close to the firing channel 1 . Here, the material web 4 runs through the hinge point 3 of the airbag flap.
Die Materialbahn 4 weist zahlreiche Öffnungen 6 auf, die vom Kunststoff der Schusskanalwand 5 und/oder der Airbagklappe 2 durchdrungen sind, um einen Formschluss zwischen der Materialbahn und dem Kunststoff der Schusskanalwand zu erreichen. Diese Öffnungen 6 befinden sich vorzugsweise auch im Bereich der Gelenkstelle 3 der Materialbahn. The material web 4 has numerous openings 6 which are penetrated by the plastic of the firing channel wall 5 and / or the airbag flap 2 in order to achieve a positive fit between the material web and the plastic of the firing channel wall. These openings 6 are preferably also located in the area of the hinge point 3 of the material web.
Die Öffnungen 6 können U-, L-, T- oder Doppel-T-förmig sein und schaffen einen Formschluss, der noch dadurch erhöht wird, The openings 6 can be U-, L-, T- or double-T-shaped and create a form fit that is further increased by
- dass der Rand der Öffnungen 6 der Materialbahn 4 aus der Fläche der Materialbahn 4 zur einen Seite oder zu beiden Seiten vorsteht, und/oder - dass am Rand der Öffnungen 6 der Materialbahn 4 mindestens ein Vorsprung insbesondere eine Zunge angeformt ist, die aus der Fläche der Materialbahn vorsteht. - That the edge of the openings 6 of the material web 4 protrudes from the surface of the material web 4 to one side or to both sides, and / or - That at least one projection, in particular a tongue, is formed on the edge of the openings 6 of the material web 4 and protrudes from the surface of the material web.
Vorzugsweise sind die Öffnungen 6 in der Materialbahn und in der Faltlinie 8 einer Faltung 7 am unteren Ende der in der Schusskanalwand 5 befindlichen Materialbahn 4 in gleichen Abständen angeordnet. The openings 6 in the material web and in the fold line 8 of a fold 7 at the lower end of the material web 4 located in the firing channel wall 5 are preferably arranged at equal intervals.
Die Materialbahn 4 weist ein Gewebe oder Gewirke aus Polypropylen oder Polyester auf, das beidseitig von einem thermoplastischen Verbundwerkstoff bedeckt ist. The material web 4 has a woven or knitted fabric made of polypropylene or polyester, which is covered on both sides by a thermoplastic composite material.

Claims

Ansprüche Expectations
1. Abdeckung eines Airbagschusskanals (1 ) mit einer von der Abdeckung gebildeten Airbagklappe (2), die durch das ausgelöste Airbagkissen dreiseitig aufreißt und um die vierte, eine Gelenkstelle (3) bildende Seite verschwenkt, wobei die Airbagklappe (2) innenseitig eine Materialbahn (4) als Klappenstützwand aufweist, die sich über die Gelenkstelle (3) hinaus über eine Wand (5) des Schusskanals innenseitig erstreckt, dadurch gekennzeichnet, dass die Materialbahn (4) zahlreiche Öffnungen (6) aufweist, die vom Kunststoff der Schusskanalwand (5) und/oder der Airbagklappe (2) durchdrungen sind, um einen Formschluss zwischen der Materialbahn und dem Kunststoff der Schusskanalwand zu erreichen. 1. Cover of an airbag firing channel (1) with an airbag flap (2) formed by the cover, which tears open on three sides by the triggered airbag cushion and pivots around the fourth side forming a hinge point (3), the airbag flap (2) having a material web (2) on the inside. 4) as a flap support wall, which extends beyond the hinge point (3) beyond a wall (5) of the firing channel on the inside, characterized in that the material web (4) has numerous openings (6) which are made of the plastic of the firing channel wall (5) and / or the airbag flap (2) are penetrated in order to achieve a form fit between the material web and the plastic of the firing channel wall.
2. Abdeckung nach Anspruch 1, dadurch gekennzeichnet, dass die Öffnungen U-, L-, T- oder Doppel-T-förmig sind. 2. Cover according to claim 1, characterized in that the openings are U-, L-, T- or double-T-shaped.
3. Abdeckung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Rand der Öffnungen (6) der Materialbahn (4) aus der Fläche der Materialbahn (4) zur einen Seite oder zu beiden Seiten vorsteht. 3. Cover according to claim 1 or 2, characterized in that the edge of the openings (6) of the material web (4) protrudes from the surface of the material web (4) to one side or to both sides.
4. Abdeckung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass am Rand der Öffnungen (6) der Materialbahn (4) mindestens ein Vorsprung insbesondere eine Zunge angeformt ist, die aus der Fläche der Materialbahn vorsteht. 4. Cover according to one of the preceding claims, characterized in that at least one projection, in particular a tongue, is formed on the edge of the openings (6) of the material web (4), which protrudes from the surface of the material web.
5. Abdeckung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass das der Airbagklappe (2) abgewandte Ende der Materialbahn (4) eine Faltung (7) bildet, deren Faltlinie parallel zur Drehachse der Gelenkstelle (3) verläuft und die sich innerhalb des Kunststoffmaterials der Schusskanalwand (5) befindet, wobei die Faltlinie (8) der Materialbahn (4) durch zahlreiche Öffnungen unterbrochen ist, die vom Kunststoff der Schusskanalwand (5) durchdrungen sind. 5. Cover according to one of the preceding claims, characterized in that the end of the material web (4) facing away from the airbag flap (2) forms a fold (7), the fold line of which runs parallel to the axis of rotation of the hinge point (3) and which extends within the Plastic material of the firing channel wall (5) is located, the fold line (8) of the material web (4) being interrupted by numerous openings through which the plastic of the firing channel wall (5) penetrates.
6. Abdeckung nach Anspruch 5, dadurch gekennzeichnet, dass die Öffnungen (6) in der Faltlinie (8) regelmäßig in gleichen Abständen angeordnet sind. 6. Cover according to claim 5, characterized in that the openings (6) in the fold line (8) are regularly arranged at equal intervals.
7. Abdeckung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass im Bereich der Gelenkstelle (3) die Materialbahn (4) eine Faltung bildet. 7. Cover according to one of the preceding claims, characterized in that the material web (4) forms a fold in the region of the hinge point (3).
8. Abdeckung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Materialbahn (4) ein Gewebe oder Gewirke aus Polypropylen oder Polyester aufweist, das beidseitig von einem thermoplastischen Verbundwerkstoff bedeckt ist. 8. Cover according to one of the preceding claims, characterized in that the material web (4) has a woven or knitted fabric made of polypropylene or polyester, which is covered on both sides by a thermoplastic composite material.
PCT/EP2021/054087 2020-02-24 2021-02-19 Covering of an airbag ejection channel WO2021170491A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202180010354.2A CN115003561A (en) 2020-02-24 2021-02-19 Cover for an airbag discharge channel
EP21707208.1A EP4110655A1 (en) 2020-02-24 2021-02-19 Covering of an airbag ejection channel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020104716.9A DE102020104716A1 (en) 2020-02-24 2020-02-24 Cover of an airbag firing channel
DE102020104716.9 2020-02-24

Publications (1)

Publication Number Publication Date
WO2021170491A1 true WO2021170491A1 (en) 2021-09-02

Family

ID=74673208

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/054087 WO2021170491A1 (en) 2020-02-24 2021-02-19 Covering of an airbag ejection channel

Country Status (4)

Country Link
EP (1) EP4110655A1 (en)
CN (1) CN115003561A (en)
DE (1) DE102020104716A1 (en)
WO (1) WO2021170491A1 (en)

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EP1731381A2 (en) * 2005-06-09 2006-12-13 Volkswagen AG Base module for an airbag device, associated airbag device, manufacturing method and manufacturing tool for an airbag module
EP2019000A2 (en) * 2007-07-26 2009-01-28 Lisa Dräxlmaier GmbH Knitted fabrics with filler threads for airbag flap
DE102008019950A1 (en) * 2008-04-21 2009-10-22 Volkswagen Ag Air bag arrangement for vehicle, has air bag cover, which covers air bag opening and instrument panel that is fixed by hinge element in base body, where hinge element has ranges
EP2193960A1 (en) * 2008-12-05 2010-06-09 Peguform GmbH Modular structured internal cladding component with a bullet channel module for an airbag
DE102009012898A1 (en) * 2009-03-12 2010-09-16 GM Global Technology Operations, Inc., Detroit Airbag arrangement i.e. front seat passenger airbag arrangement, for vehicle, has coupling device acting as hinge during opening of airbag flap, where coupling device is fastened at filling channel section by integral connection
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DE102012220979A1 (en) * 2012-11-16 2014-05-22 Lisa Dräxlmaier GmbH Flexible layer with at least one regular structure made of carbon fibers useful in a component, preferably an interior part of a vehicle interior, an airbag flap or a hinge for the airbag flap
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11440498B2 (en) * 2018-08-24 2022-09-13 Riedel Communications International GmbH Airbag cover

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Publication number Publication date
DE102020104716A1 (en) 2021-08-26
EP4110655A1 (en) 2023-01-04
CN115003561A (en) 2022-09-02

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