Inflatable curtain cushion tab shock absorption

• US 7,357,408 B2
• Filed: 02/28/2005
• Issued: 04/15/2008
• Est. Priority Date: 02/28/2005
• Status: Active Grant

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Drake, Eric R., Jones, Terry S., Burton, Thomas C., Hall, Michael Ray
• Primary Examiner(s): Dickson; Paul N.
• Assistant Examiner(s): Brown; Drew J.
• Application Number:
  US11/068,662
• Publication Number:
  US 20060192368A1
• Time in Patent Office: 1,142 Days
• Field of Search: 280/730.2, 280/728.2, 280/743.2, 188/371, 188/376
• US Class Current: 280/728.2
• CPC Class Codes: B60R 21/213 in vehicle roof frames or pillars
• CPC Class Codes: B60R 21/232 Curtain-type airbags deploying mainly in a vertical direction from their top edge

Abstract

A retention tab unit is disclosed comprising a retention tab configured for attaching an inflatable curtain to a vehicle. The retention tab unit has an energy absorption mechanism that facilitates confinement of the retention tab in an initial configuration wherein the retention tab is not taut. Once the inflatable curtain is deployed, the energy absorption mechanism is configured to release the retention tab from its initial configuration and allow it to be forced into a deployed configuration wherein the retention tab tautly extends from the vehicle.

Claims

1. An inflatable curtain module comprising:

an inflatable curtain comprising an inflatable portion;

a plurality of retention tabs configured for attaching the inflatable curtain to a vehicle such that the inflatable portion is below the retention tabs after attachment, wherein each retention tab has a folded portion which is folded against itself; and

wherein each retention tab comprises a frangible energy absorption mechanism configured to temporarily hold the folded portion of each retention tab in its folded configuration, wherein the frangible energy absorption mechanism is configured such that, upon deployment of the inflatable portion of the inflatable curtain, the frangible energy absorption mechanism breaks and no longer holds the retention tab in its folded configuration and the retention tab moves to a deployed configuration,

wherein the initial folded configuration prevents the retention tabs from being both taut and fully extended, and wherein a greater amount of the length of each retention tab tautly extends to support the inflatable portion of the curtain below the retention tabs once the retention tabs are in the deployed configuration as compared with the folded configuration of the retention tabs.

2. The module of claim 1, wherein the frangible energy absorption mechanism comprises at least one stitch.

3. The module of claim 1, wherein the frangible energy absorption mechanism comprises a plurality of stitches.

4. The module of claim 1, wherein each retention tab is folded against itself twice in a first location while in the folded configuration.

5. The module of claim 4, wherein each retention tab is folded against itself twice in a second location while in the folded configuration which is separate from the first location.

6. The module of claim 1, wherein each retention tab is folded against itself at least four times in the same general location.

7. The module of claim 1, wherein the distance between the top of each retention tab and the bottom of each respective retention tab in the folded configuration is less than the distance between the top of each retention tab and the bottom of each respective retention tab in the deployed configuration such that the length of the retention tabs in their deployed configuration controls the position of the inflatable portion of the deployed curtain.

8. An inflatable curtain module comprising:

an inflatable curtain comprising an inflatable portion;

a retention tab extending from the module and configured for attaching the inflatable curtain to a vehicle; and

a sacrificial retention tab extending from generally the same portion of the module as the retention tab, wherein the sacrificial retention tab has a weakened portion which allows the sacrificial retention tab to be severed during deployment of the inflatable curtain;

wherein the retention tab is longer than the sacrificial retention tab.

9. The module of claim 8, wherein the weakened portion comprises at least two rows of slits, and wherein the rows of slits are offset such that a substantial number of lines perpendicular to an intact portion of one row intersect a slit in an adjacent row.

10. The module of claim 8, wherein the weakened portion of the sacrificial retention tab comprises a slit pattern, wherein the slit pattern is configured such that all or substantially all vertical threads in the sacrificial retention tab are severed by at least one slit.

11. The module of claim 10, wherein the slit pattern comprises a herringbone pattern.

12. The module of claim 8, wherein the weakened portion is formed by a laser cut.

13. The module of claim 8, wherein the weakened portion comprises perforations.

14. The module of claim 8, wherein the weakened portion comprises a pre-severed portion that has been reattached.

15. The module of claim 8, wherein the retention tab is elongated such that it extends along a substantial portion of the inflatable portion of the inflatable curtain.

16. The module of claim 8, wherein the inflatable curtain module comprises a plurality of the retention tabs.

17. The module of claim 8, wherein the retention tab has an initial configuration when attached to a vehicle and is adapted to have a deployed configuration, wherein the initial configuration prevents the retention tab from being both taut and fully extended, and wherein a greater amount of the length of the retention tab tautly extends to support the curtain once the retention tab is in its deployed configuration as compared with the initial configuration of the retention tab.

18. The module of claim 17, wherein the distance between the top of the retention tab and the bottom of the retention tab in the initial configuration is less than the distance between the top of the retention tab and the bottom of the retention tab in the deployed configuration such that the length of the retention tab in its deployed configuration controls the position of the inflatable portion of the deployed curtain.