Resiliently compressible deployment ramp for inflatable curtain

• US 20060125214A1
• Filed: 12/10/2004
• Published: 06/15/2006
• Est. Priority Date: 12/10/2004
• Status: Active Grant

• Current Assignee: TRW Vehicle Safety Systems Incorporated (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: TRW Vehicle Safety Systems Incorporated (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Bertossi, Rico Scott
• Granted Patent: US 7,322,601 B2
• Time in Patent Office: Days
• US Class Current: 280/730.200
• CPC Class Codes: B60R 2021/161 characterised by additional means for controlling deployment trajectory
• 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

An apparatus (10) helps to protect an occupant of a vehicle (12) that has a roof (18), a side structure (16), and a trim piece (310) overlying the side structure. The apparatus (10) includes an inflatable curtain (14) inflatable away from the vehicle roof (18) to a position adjacent the side structure (16). The apparatus (10) also includes a deployment ramp (160) having a deployment position in which the deployment ramp directs the inflatable curtain (14) to deploy inboard of the trim piece (310). The deployment ramp (160) is configured and arranged to deflect away from the deployment posit-ion in order to absorb forces from occupant impacts with the deployment ramp. Preferably, the deployment ramp (160) is also configured and arranged to return to the deployment position after absorbing forces from occupant impacts with the deployment ramp when the inflatable curtain (14) is not inflated.

Claims

1. An apparatus for helping to protect an occupant of a vehicle that has a roof, a side structure, and a trim piece overlying the side structure, said apparatus comprising:

an inflatable curtain that is inflatable away from the vehicle roof to a position adjacent the side structure of the vehicle; and

a deployment ramp having a deployment position in which said deployment ramp directs said inflatable curtain to deploy inboard of the trim piece, said deployment ramp being configured and arranged to deflect away from said deployment position in order to absorb forces from occupant impacts with said deployment ramp.

2. The apparatus recited in claim 1, wherein said deployment ramp is configured and arranged to deflect in order to absorb forces from occupant impacts while said inflatable curtain is in a deflated and stored condition.

3. The apparatus recited in claim 2, wherein said deployment ramp is configured and arranged to return to said deployment position after absorbing forces from occupant impacts with said deployment ramp while said inflatable curtain is in the deflated and stored condition.

4. The apparatus recited in claim 1, wherein said deployment ramp is configured to undergo compression when said deployment ramp deflects away from said deployment position to absorb forces from impacts with said deployment ramp.

5. The apparatus recited in claim 1, wherein said deployment ramp returns to said deployment position as a result of the resilience of at least a portion of said deployment ramp.

6. The apparatus recited in claim 1, wherein said deployment ramp occupies a volume of space when in said deployment position, said volume of space occupied by said deployment ramp being reduced when said deployment ramp deflects away from said deployment position to absorb forces from impacts with said deployment ramp.

7. The apparatus recited in claim 1, wherein at least a portion of said deployment ramp is constructed of a cellular foam material.

8. The apparatus recited in claim 7, wherein said cellular foam material undergoes compression when said deployment ramp deflects, said cellular foam material being resilient so as to cause said deployment ramp to return to said deployment position after undergoing compression.

9. The apparatus recited in claim 7, wherein said deployment ramp comprises an outer skin surrounding said cellular foam material.

10. The apparatus recited in claim 9, wherein said cellular foam material is made of a foamed polymer, said outer skin comprising a non-foamed layer of said polymer having a density greater than the density of said foamed polymer.

11. The apparatus recited in claim 1, wherein said deployment ramp comprises a ramp part including a ramp surface and a spring adapted to bias said ramp part toward said deployment position, said ramp part moving against the bias of said spring when said deployment ramp deflects away from said deployment position to absorb forces from impacts with said deployment ramp.

12. The apparatus recited in claim 11, further comprising a base part, said ramp part being configured and arranged to be movable relative to said base part, said spring urging said ramp part to move relative to said base part toward said deployment position.

13. The apparatus recited in claim 12, wherein said base part and said ramp part together occupy a volume of space, the volume of space occupied by said base part and said ramp part being reduced when said deployment ramp deflects away from said deployment position to absorb forces from impacts with said deployment ramp.

14. The apparatus recited in claim 1, wherein said deployment ramp comprises a sheet of resilient metal, said sheet of resilient metal being constructed and arranged to include a ramp surface and at least one portion deflectable upon loading of said ramp surface.

15. The apparatus recited in claim 14, wherein said metal layer is constructed of a spring alloy metal.

16. The apparatus recited in claim 1, wherein the side structure of the vehicle includes a pillar, the trim piece overlying the pillar, said deployment ramp while in said deployment position directing said inflatable curtain to deploy inboard of the trim piece overlying the pillar.