Biasing deployment flap and inflatable cushion cover

• US 20030234520A1
• Filed: 04/11/2003
• Published: 12/25/2003
• Est. Priority Date: 06/25/2002
• Status: Active Grant

• Current Assignee: Autoliv AB (Autoliv Incorporated)
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Inventors: Winters, Mark T., Hawthorn, Laura A., Dunkle, Stephanie, Gustke, Richard J., Strong, Brian T.
• Granted Patent: US 6,942,242 B2
• Time in Patent Office: Days
• US Class Current: 280/728.1
• CPC Class Codes: B60R 2021/161 characterised by additional means for controlling deployment trajectory
• CPC Class Codes: B60R 21/16 Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags protective garments with automatically inflatable shock-absorbing means A41D13/018; connection of valves to inflatable elastic bodies B60C29/00
• CPC Class Codes: B60R 21/201 Packaging straps or envelopes for inflatable members
• CPC Class Codes: B60R 21/205 in dashboards

Abstract

A deployment flap for use with an inflatable cushion is provided. The deployment flap includes a fabric or other flexible, foldable material; a plurality of securement tabs each having a weakened area; and a cover area defined in the fabric. The fabric is connectable to the inflatable cushion to cause the inflatable cushion to be biased in a selected direction upon inflation of the inflatable cushion. The cover area covers the inflatable cushion prior to inflation of the inflatable cushion. The securement tabs secure the fabric to a retainer. The weakened area releases the fabric from the retainer upon the inflation of the inflatable cushion.

Claims

1. A deployment flap configured for use with an inflatable cushion and retainer of an airbag module, comprising:

a foldable material defining the deployment flap;

a plurality of securement tabs being configured to secure the deployment flap to the retainer each of said plurality of securement tabs being secured to the deployment flap and are each configured to have a weakened area; and

a cover area defined in said foldable material, said foldable material being configured for securement about the inflatable cushion such that said foldable material is folded over the inflatable cushion to be positioned to cause the inflatable cushion to be biased in a selected direction upon inflation of the inflatable cushion during a deployment scenario, said cover area covering and retaining substantially all of the inflatable cushion when it is in a pre-deployment configuration, said securement tabs being configured to secure said foldable material to said retainer and said weakened area being configured to release said foldable material from said retainer upon the inflation of the inflatable cushion.

2. The deployment flap as in claim 1, wherein said plurality of securement tabs are cut out of said foldable material such that a portion of said plurality of securement tabs remains secured to said foldable material.

3. The deployment flap as in claim 2, wherein said deployment flap is sewn to the inflatable cushion of the airbag module.

4. The deployment flap as in claim 1, wherein plurality of said securement tabs are secured to said foldable material such that a portion of said plurality of securement tabs remains secured to said foldable material when said foldable material is released from said retainer.

5. The deployment flap as in claim 4, wherein said deployment flap is sewn to the inflatable cushion of the airbag module.

6. The deployment flap as in claim 3, wherein said plurality of securement tabs are plastic.

7. An airbag module adapted for use in a vehicle having an occupant, comprising:

a housing;

an inflator;

an inflatable cushion stored in a folded position in said housing, said inflatable cushion being in fluid communication with said inflator such that upon detection of an activation event said inflator provides a quantity of inflation gas to cause said inflatable cushion to inflate;

a deployment flap being secured to a portion of said inflatable cushion, said deployment flap biasing the inflation configuration of the inflatable cushion during a deployment scenario;

a plurality of securement tabs for releasably securing said deployment flap to a retainer adapted for securing said inflatable cushion to said housing;

wherein a cover area of said deployment flap covers said inflatable cushion in when said inflatable cushion and said deployment flap are in a pre-deployment folded position, said securement tabs releasing said deployment flap from said inflatable cushion after a predetermined amount of force is generated by said inflatable cushion, said predetermined amount of force being sufficient to sever said plurality of securement tabs.

8. The airbag module as in claim 7, wherein said plurality of securement tabs are cut out of said deployment flap such that a portion of said plurality of securement tabs remains secured to said deployment flap.

9. The airbag module as in claim 7, wherein said deployment flap is sewn to the inflatable cushion of the airbag module as a position remote from said plurality of securement tabs.

10. The airbag module as in claim 7, wherein said deployment flap is sewn to the inflatable cushion of the airbag module as a position remote from said plurality of securement tabs and said plurality of securement tabs are secured to said deployment flap such that a portion of said plurality of securement tabs remains secured to said deployment flap when said deployment flap is released from said retainer.

11. The airbag module as in claim 7, wherein said deployment flap has a normal stored position overlying the folded inflatable cushion and deployable toward the occupant by the deploying inflatable cushion, said deployment flap having at least an end wall pleated inwardly to lie on top of the folded inflatable cushion, and a top flap hingedly connected to the end wall and folded to lie on top of the pleated end wall in a closed top position so that initial deployment of the inflatable cushion unpleats the end wall and permits the top flap to shift toward the occupant and then bias initial deployment of the inflatable cushion laterally of the occupant when the top flap is held in the folded position until the eventual unfolding of the top flap permits subsequent unbiased deployment of the inflatable cushion toward the occupant.

12. The airbag module as in claim 7, wherein said deployment flap comprises a flexible foldable material including a rearward wall and a side wall attached to the airbag module and folded overtop the folded inflatable cushion so that the rearward and side walls are deployed ahead of the deploying inflatable cushion to define an inflatable cushion deployment chute having a lateral deployment opening opposite an end wall and a top deployment opening which registers with the deployment opening of the airbag module, and said end wall having an extended flap portion extending beyond the dimensional extent of the rearward wall and being folded overtop the folded inflatable cushion in the stored position so that the flap portion closes the top opening of the chute to bias the inflatable cushion deployment through the lateral opening until the flap portion is unfolded to an extended position opening the top opening of the chute to permit further deployment of the inflatable cushion through the top opening.

13. The airbag module as in claim 12, wherein said plurality of securement tabs are cut out of said foldable material such that a portion of said plurality of securement tabs remains secured to said foldable material.

14. The airbag module as in claim 13, wherein said plurality of securement tabs each have an opening configured to receive a stud of said retainer.

15. The airbag module as in claim 14, wherein said deployment flap is sewn to the inflatable cushion of the airbag module.

16. The airbag module as in claim 12, wherein said plurality of securement tabs are plastic members secured to said foldable material, said plurality of securement tabs each have an opening configured to receive a stud of said retainer and said deployment flap is sewn to the inflatable cushion of the airbag module.

17. The airbag module as in claim 16, wherein said deployment flap maintains the inflatable cushion in its folded position when said deployment flap is in its folded position atop the inflatable cushion.

18. An apparatus for selectively modifying the deployment of an inflatable cushion of an airbag module about an occupant of the vehicle, comprising:

a deployment guide member having a normal stored position overlying the folded inflatable cushion and deployable through an opening for the deploying inflatable cushion, said deployment guide member having a confinement shape with an open bottom admitting the deploying inflatable cushion and a forward wall, a rearward wall, and an outboard side wall deployable from the stored position on top the folded inflatable cushion to a deployed position, a top flap hingedly connected to the outboard side wall for movement between a closed top position and an open top position, and an open inboard side through which the inflatable cushion obtains initial deployment laterally of the occupant when the top flap is held in the closed top position;

wherein a plurality of securement members are releasably secured to said deployment guide member at one end and a portion of the airbag module at the other.

21. The apparatus of claim 18, wherein said forward wall and said rearward wall further comprise extended portions which cover a portion of an opening defined by said deployment guide member opposite said outboard side wall.

22. The apparatus of claim 21, wherein said extended portion overlap each other about said opening.

19. A method of assembling and securing a deployment flap about an inflatable cushion of an airbag module adapted for use in a vehicle, comprising:

folding the inflatable cushion to a desired pre-deployment folded position;

securing a deployment flap to a first portion of the folded inflatable cushion;

securing a retainer to a second portion of the folded inflatable cushion; and

securing said deployment flap to said retainer by securing a plurality of releasable securing members to said retainer;

wherein a cover area of said deployment flap covers the inflatable cushion in said desired pre-deployment folded position, said deployment flap being released from said retainer upon the inflation of the inflatable cushion, and said deployment flap being configured, dimensioned and positioned to bias the inflatable cushion in a selected direction if the deployment flap makes contact with an occupant of the vehicle.

20. The method as in claim 19, wherein said deployment flap has a normal stored position overlying the folded inflatable cushion and deployable toward the occupant by the deploying inflatable cushion, said deployment flap having at least an end wall pleated inwardly to lie on top of the folded inflatable cushion, and a top flap hingedly connected to the end wall and folded to lie on top of the pleated end wall in a closed top position so that initial deployment of the inflatable cushion unpleats the end wall and permits the top flap to shift toward the occupant and then bias initial deployment of the inflatable cushion laterally of the occupant when the top flap is held in the folded position until the eventual unfolding of the top flap permits subsequent unbiased deployment of the inflatable cushion toward the occupant.