Flexible airbag flap

• US 7,380,813 B2
• Filed: 01/14/2005
• Issued: 06/03/2008
• Est. Priority Date: 01/16/2004
• Status: Active Grant

• Current Assignee: LISA Drã¤Xlmaier GmbH (Fritz Dräxlmaier Holding GmbH)
• Original Assignee: LISA Drã¤Xlmaier GmbH (Fritz Dräxlmaier Holding GmbH)
• Inventors: Schlemmer, Christian, Ziegler, Herbert, Winterhoff, Thomas, Lanzinger, Marcus, Mueller, Henry, Sachtleben, Bernd
• Primary Examiner(s): CULBRETH, ERIC D
• Application Number:
  US11/034,854
• Publication Number:
  US 20050184487A1
• Time in Patent Office: 1,236 Days
• Field of Search: 280/728.3, 280/728.1, 280/732, 280/728.2
• US Class Current: 280/728.3
• CPC Class Codes: B60R 21/205 in dashboards
• CPC Class Codes: B60R 21/2165 characterised by a tear line for defining a deployment opening

Abstract

A flexible airbag flap of an airbag module, in particular for use in motor vehicles, where the airbag module is arranged on a frame, preferably a metal frame, connected with a decor carrier of an instrument panel, and attached to the decor carrier but not to a cross member supporting the instrument panel. The flexible airbag flap can essentially be supported by the airbag arranged in the airbag module. The decor carrier is designed as one piece with the flexible airbag flap and in the area of the flexible airbag flap has a reduced wall thickness. Also disclosed is a method for production of such a flexible airbag flap with the steps of arranging the frame and preferably an additional layer covering the frame in a forming tool, and connecting the frame with a material, preferably a foaming material, that forms the decor carrier and the flexible airbag flap.

Claims

1. An arrangement comprising:

a flexible airbag flap and an airbag module housing an airbag, wherein

the airbag module is arranged on a frame, other than a cross member of an instrument panel, the frame being integrated into a decor carrier of the instrument panel, and

the decor carrier forms an integral piece with the flexible airbag flap and is reduced in wall thickness in an area defining the flexible airbag flap, and

the frame, both from the top and from the underside, is foamed, such that the frame is surrounded with material of the decor carrier.

2. The arrangement according to claim 1, wherein the reduced wall thickness of the decor carrier in the area of the flexible airbag flap has a thickness of 1-3 mm.

3. The arrangement according to claim 1, wherein the decor carrier is completely covered with a decor layer.

4. The arrangement according to claim 3, wherein the decor layer has at least partial weakening zones which serve as tear points on deployment of the airbag.

5. The arrangement according to claim 1, wherein the flexible airbag flap has at least one hinge about which the flexible airbag flap folds as the airbag expands.

6. The arrangement according to claim 5, wherein the at least one hinge is formed by non-weakened areas of at least one of the decor carrier and a decor layer.

7. The arrangement according to claim 5, wherein in the area of the at least one hinge, an additional flexible reinforcement is connected with the decor carrier.

8. The arrangement according to claim 1, wherein the decor carrier and the airbag module are fastened together by a fastener integrated into the decor carrier.

9. The arrangement according to claim 1, wherein an additional layer of flexible material is arranged between the airbag and the decor carrier.

10. The arrangement according to claim 9, wherein the additional layer is a textile matting.

11. The arrangement according to claim 9, wherein the additional layer is a laminate of at least two layers.

12. The arrangement according to claim 9, wherein a layer of Teflon®

is provided between the layer of flexible material and the airbag.

13. The arrangement according to claim 1, wherein the frame comprises a plastic mixed with reinforcement fibers.

14. The arrangement according to claim 1, wherein the decor carrier comprises polyurethane mixed with glass fibers.

15. A method for producing a flexible airbag flap and an airbag module, the airbag module being arranged on a frame, other than a cross member of an instrument panel, the frame being integrated into a decor carrier of the instrument panel, the decor carrier forming an integral piece with the flexible airbag flap and being reduced in wall thickness in an area defining the flexible airbag flap, the method comprising:

connecting the frame with a material, to form the decor carrier and the flexible airbag flap, and

foaming the frame both from the top and from the underside, thereby surrounding the frame with the decor carrier material.

16. The method according to claim 15, wherein the reduced wall thickness in the area defining the flexible airbag flap is created during forming of the decor carrier.

17. The method according to claim 15, further comprising providing, in the area defining the flexible airbag flap, at least one of tear points and tear lines.

18. The method according to claim 15, wherein the decor carrier is made from polyurethane mixed with glass fibers.

19. The method according to claim 18, wherein the glass fibers are connected with the polyurethane using long fiber injection (LFI).

20. The method according to claim 15, wherein the frame integrated in the decor carrier is produced in one work process.

21. The method according to claim 15, further comprising fastening the airbag module to the decor carrier with a fastener integrated into the decor carrier.