Airbag lateral flap

• US 8,272,664 B2
• Filed: 12/13/2007
• Issued: 09/25/2012
• Est. Priority Date: 12/13/2007
• Status: Active Grant

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Benny, Jesse, Lachat, Michael, Libby, Anna, Lusk, Bobby
• Primary Examiner(s): Rocca, Joseph
• Assistant Examiner(s): BECK, KAREN JANE AMORES
• Application Number:
  US11/956,101
• Publication Number:
  US 20090152842A1
• Time in Patent Office: 1,748 Days
• Field of Search: 280/728.3, 280/730.1, 280/732, 280/733, 280/739, 280/743.2, 280/743.1, 280/740
• US Class Current: 280/728.1
• CPC Class Codes: B60R 2021/161 characterised by additional means for controlling deployment trajectory
• CPC Class Codes: B60R 2021/23382 Internal tether means
• CPC Class Codes: B60R 21/201 Packaging straps or envelopes for inflatable members
• CPC Class Codes: B60R 21/205 in dashboards
• CPC Class Codes: B60R 21/2338 Tethers
• CPC Class Codes: B60R 21/239 characterised by their venting means

Abstract

The airbag assembly features an airbag cushion, a deployment flap, an extension flap attached to the deployment flap, and a lateral flap. The deployment flap is configured to protect the airbag cushion as it deploys from the module housing. The extension flap is configured to position the airbag cushion during deployment. The lateral flap is configured to allow for proper airbag deployment.

Claims

1. An airbag assembly, comprising:

an inflatable airbag cushion in a folded configuration comprising a plurality of folds and a top surface that is directed towards a cover when the inflatable airbag cushion is deployed;

an extension flap,

wherein the extension flap comprises a free end and an attached end that are opposite from each other,

wherein the extension flap is at least partially wrapped around the inflatable airbag cushion before deployment of the inflatable airbag cushion,

wherein the extension flap is configured to protect the inflatable airbag cushion during deployment,

wherein the extension flap is positioned such that, during deployment, the attached end remains attached at a location that enables the extension flap to be positioned below the inflatable airbag cushion in a passenger compartment of a vehicle during deployment,

wherein the extension flap is configured such that the free end is unattached before deployment of the inflatable airbag cushion and remains unattached during deployment of the inflatable airbag cushion,

wherein the extension flap is configured not to rupture during deployment; and

,

a lateral flap coupled adjacent to the inflatable airbag cushion and, in the undeployed state, at least partially wrapped around the folded inflatable airbag cushion but not the extension flap,

wherein, in the undeployed state, the free end of the extension flap and a plurality of folds of the extension flap are positioned over the top surface of the folded inflatable airbag cushion and over a portion of the lateral flap that is configured to rupture such that the portion of the lateral flap that is configured to rupture is disposed between the top surface of the folded inflatable airbag cushion and the plurality of folds of the extension flap,

wherein the airbag cushion, the extension flap and the lateral flap are positioned and configured such that, during inflatable airbag cushion deployment, the extension flap does not retard the timing for full deployment of the inflatable airbag cushion, and

whereby, during deployment of the inflatable airbag cushion, the extension flap deploys in front of the inflatable airbag cushion due to the position of the free end of the extension flap and the folds of the extension flap, in the undeployed state, over a portion of the lateral flap that is configured to rupture and over the top surface of the folded inflatable airbag cushion.

2. The airbag assembly of claim 1, further comprising a deployment flap coupled adjacent to the inflatable airbag cushion, wherein the deployment flap is configured to protect the inflatable airbag cushion as it deploys out of an airbag module housing.

3. The airbag assembly of claim 2, wherein the extension flap is attached to the deployment flap.

4. An airbag assembly, comprising:

an inflatable airbag cushion in a folded configuration, comprising a plurality of folds and a top surface that is directed towards a cover when the inflatable airbag cushion is deployed, wherein the inflatable airbag cushion is configured for frontal deployment with distal end, a bottom surface and an opposing top surface, wherein the top surface is closer to a windshield of a vehicle when the inflatable airbag cushion is deployed than the bottom surface;

an extension flap,

wherein the extension flap comprises a free end and an attached end that are opposite from each other,

wherein the extension flap is at least partially wrapped around the inflatable airbag cushion before deployment of the inflatable airbag cushion,

wherein the extension flap is configured to protect the inflatable airbag cushion during deployment,

wherein the extension flap is positioned such that, during deployment, the attached end remains attached at a location that enables the extension flap to be positioned below the bottom surface of the inflatable airbag cushion in a passenger compartment of a vehicle during deployment,

wherein the extension flap is configured such that the free end is unattached before deployment of the inflatable airbag cushion and remains unattached during deployment of the inflatable airbag cushion,

wherein the extension flap is configured not to rupture during deployment; and

,

a lateral flap coupled adjacent to the inflatable airbag cushion and, in the undeployed state, at least partially wrapped around the folded inflatable airbag cushion but not the extension flap,

wherein, in the undeployed state, the free end of the extension flap and a plurality of folds of the extension flap are positioned over the top surface of the folded inflatable airbag cushion and over a portion of the lateral flap that is configured to rupture such that the portion of the lateral flap that is configured to rupture is disposed between the top surface of the folded inflatable airbag cushion and the plurality of folds of the extension flap,

wherein the portion of the lateral flap that is configured to rupture is oriented such that rupturing occurs perpendicular to the folds of the extension flap,

wherein the airbag cushion, the extension flap and the lateral flap are positioned and configured such that, during inflatable airbag cushion deployment, the extension flap does not retard the timing for full deployment of the inflatable airbag cushion, and

whereby, during deployment of the inflatable airbag cushion, the free end of the extension flap deploys in front of the inflatable airbag cushion due to the position of the free end of the extension flap, in the undeployed state, over a portion of the lateral flap that is configured to rupture and over the top surface of the folded inflatable airbag cushion.

5. The airbag assembly of claim 4, wherein the extension flap has a width that is less than the width of the folded inflatable airbag cushion.

6. The airbag assembly of claim 4, further comprising a deployment flap coupled adjacent to the inflatable airbag cushion, wherein the deployment flap is configured to protect the inflatable airbag cushion as it deploys out of an airbag module housing.

7. The airbag assembly of claim 6, wherein the extension flap is attached to the deployment flap.

8. An airbag assembly, comprising:

an inflatable airbag cushion in a folded configuration, comprising a plurality of folds and a top surface that is directed towards a cover when the inflatable airbag cushion is deployed, wherein the inflatable airbag cushion is configured for frontal deployment with a distal end, a bottom surface and an opposing top surface, wherein the top surface is closer to a windshield of a vehicle when the inflatable airbag cushion is deployed than the bottom surface;

an extension flap,

wherein the extension flap comprises a free end and an attached end that are opposite from each other,

wherein the extension flap is at least partially wrapped around the inflatable airbag cushion before deployment of the inflatable airbag cushion,

wherein the extension flap is configured to protect the inflatable airbag cushion during deployment,

wherein the extension flap is positioned such that, during deployment, the attached end remains attached at a location that enables the extension flap to be positioned below the bottom surface of the inflatable airbag cushion in a passenger compartment of a vehicle during deployment,

wherein the extension flap is configured such that the free end is unattached before deployment of the inflatable airbag cushion and remains unattached during deployment of the inflatable airbag cushion,

wherein the length between the attached end and the free end enables the free end to extend beyond the distal end of the inflatable airbag cushion upon full deployment of the inflatable airbag cushion, and,

wherein the extension flap is configured not to rupture during deployment;

a lateral flap coupled adjacent to the folded inflatable airbag cushion and configured to separate the inflatable airbag cushion and the extension flap when the inflatable airbag cushion is in an undeployed state,

wherein, in the undeployed state, the lateral flap at least partially wraps around the folded inflatable airbag cushion but not the extension flap,

wherein, in the undeployed state, the free end of the extension flap and a plurality of folds of the extension flap are positioned over the top surface of the folded inflatable airbag cushion and over a portion of the lateral flap that is configured to rupture such that the portion of the lateral flap that is configured to rupture is disposed between the top surface of the folded inflatable airbag cushion and the plurality of folds of the extension flap,

wherein the airbag cushion, the extension flap and the lateral flap are positioned and configured such that, during inflatable airbag cushion deployment, the extension flap does not retard the timing for full deployment of the inflatable airbag cushion, and

whereby, during deployment of the inflatable airbag cushion, the free end of the extension flap deploys in front of the inflatable airbag cushion due to the position of the free end of the extension flap and the folds of the extension flap, in the undeployed state, over a portion of the lateral flap that is configured to rupture and over the top surface of the folded inflatable airbag cushion.

9. The airbag assembly of claim 8, wherein the portion of the lateral flap that is configured to rupture is oriented such that rupturing occurs perpendicular to the folds of the extension flap.

10. The airbag assembly of claim 8, wherein the extension flap is of such a width that it does not fully cover any surface of the inflatable airbag cushion.

11. The airbag assembly of claim 8, wherein the lateral flap is of such a width that it does not fully cover any surface of the folded inflatable airbag cushion.

12. The airbag assembly of claim 8, wherein the portion of the lateral flap that is configured to rupture comprises at least one tear seam disposed within the fabric of the lateral flap.

13. The airbag assembly of claim 12, wherein the lateral flap has a rectangular shape and the tear seam runs parallel with the short axis of the lateral flap.

14. The airbag assembly of claim 12, wherein the tear seam comprises perforations in the fabric of the lateral flap.

15. The airbag assembly of claim 12, wherein the at least one tear seam is configured to fully rupture when a predetermined magnitude of stress is applied to the tear seam by the deploying inflatable airbag cushion such that the pieces of fabric on each side of the tear seam are completely separated and move out of the airbag deployment path.

16. The airbag assembly of claim 8, wherein the lateral flap comprises two semi-circular shaped ends defining the termini of the long axis of the lateral flap, the semi-circular ends configured to surround a gas-introducing throat of the inflatable airbag cushion, such that gas may enter the inflatable airbag cushion unimpeded by the lateral flap, the semi-circular shaped ends also comprising mounting tabs with apertures for receiving mounting hardware.