APPARATUS AND METHOD FOR CONTROLLING AN INFLATABLE CUSHION

• US 20050104347A1
• Filed: 01/27/2005
• Published: 05/19/2005
• Est. Priority Date: 02/20/2002
• Status: Active Grant

• Current Assignee: Autoliv Development AB (Autoliv Incorporated)
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Inventors: Pinsenschaum, Ryan T., Winters, Mark T., Webber, James L., Hawthorn, Laura A., Brown, Jason W.
• Granted Patent: US 7,566,074 B2
• Time in Patent Office: Days
• US Class Current: 280/739
• CPC Class Codes: B60R 2021/01211 Expansion of air bags
• CPC Class Codes: B60R 2021/23382 Internal tether means
• CPC Class Codes: B60R 21/01 Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents electrical circuits for transmission of signals between steering wheel and the vehicle itself B60R16/027; for electrically actuating belt retractor locking means B60R22/343
• CPC Class Codes: B60R 21/2171 specially adapted for elongated cylindrical or bottle-like inflators with a symmetry axis perpendicular to the main direction of bag deployment, e.g. extruded reaction canisters B60R21/2176 takes precedence
• CPC Class Codes: B60R 21/233 comprising a plurality of individual compartments; comprising two or more bag-like members, one within the other B60R21/232 takes precedence
• CPC Class Codes: B60R 21/2338 Tethers
• CPC Class Codes: B60R 21/2342 Tear seams
• CPC Class Codes: B60R 21/239 characterised by their venting means
• CPC Class Codes: B60R 21/276 with means to vent the inflation fluid source, e.g. in case of overpressure B60R21/30 takes precedence; venting means on inflatable member walls B60R21/239

Abstract

An air bag module, comprising: a housing having at least one vent opening; an inflatable cushion being stored in an un-deployed position in the housing; an inflator for inflating the inflatable cushion, the inflator being in fluid communication with the inflatable cushion and having a plurality of inflation openings for allowing an inflation gas to pass therethrough, at least one of the plurality of inflation openings being in fluid communication with the at least one vent opening; a deployable member being secured to an interior surface of the inflatable cushion at one end and a portion of the airbag module at the other end; wherein the deployable member is configured to allow venting through the at least one vent opening when the inflatable cushion is in the un-deployed position and the at least one vent opening is covered by the deployable member when the inflatable cushion inflates towards a fully deployed position.

Claims

1. An air bag module, comprising:

a housing having at least one vent opening;

an inflatable cushion being stored in an un-deployed position in the housing, the inflatable cushion being configured to be deployed out of the housing;

an inflator for inflating the inflatable cushion, the inflator being in fluid communication with the inflatable cushion and having a plurality of inflation openings for allowing an inflation gas to pass therethrough;

a deployable member being secured to an interior surface of the inflatable cushion at one end and a portion of the airbag module at the other end; and

wherein the deployable member is configured to allow venting through the at least one vent opening when the inflatable cushion is in the un-deployed position and the at least one vent opening is covered by the deployable member when the inflatable cushion inflates towards a fully deployed position.

2. The airbag module as in claim 1, wherein the inflator is cylindrically shaped and the plurality of inflation openings are disposed about a periphery of the inflator and the deployable member is configured to have a portion which deploys around the periphery of the inflator.

3. The airbag module as in claim 1, wherein the inflator provides a first inflation output to the inflatable cushion when the deployable member is not fully extended and a second inflation output to the inflatable cushion when the deployable member is fully extended and wherein the deployable member is folded within the housing.

4. The airbag module as in claim 3, wherein the first inflation output is provided when the inflatable cushion is not fully deployed.

5. The airbag module as in claim 1, wherein the airbag module is either a driver side or passenger side airbag module.

6. The airbag module as in claim 1, wherein the deployable member comprises a pair of deployable members covering a plurality of venting apertures.

7. The airbag module as in claim 1, wherein the deployable member comprises an elongated opening for alignment with at least some of the plurality of inflation openings of the inflator and the at least one vent opening.

8. The airbag module as in claim 1, wherein the deployable member comprises break away stitching that must be torn prior to the inflatable cushion reaching its fully deployed position.

9. The airbag module as in claim 1, wherein movement of the deployable member to a fully extended length causes a sensor to provide a signal when the deployable member is pulled to its fully extended length.

10. The airbag module as in claim 2, wherein the portion of the deployable member which deploys around the periphery of the inflator is folded within the housing and the at least one vent opening is disposed between the portion of the deployable member and the one end of the deployable member secured to the inflatable cushion.

11. The airbag module as in claim 1, wherein the at least one vent is covered by a filter material disposed on the elongated opening of the deployable member.

12. The airbag module as in claim 1, wherein the length of the deployable member is a predetermined distance the inflatable cushion inflates in a first direction away from the housing.

13. The airbag module as in claim 1, wherein at least one of the plurality of inflation openings is directly aligned with the at least one vent opening.

14. The airbag module as in claim 13, wherein the inflator is cylindrically shaped and the plurality of inflation openings are disposed about a periphery of the inflator and the deployable member is configured to have a portion which deploys around the periphery of the inflator.

15. The airbag module as in claim 13, wherein the inflator provides a first inflation output to the inflatable cushion when the deployable member is not fully extended and a second inflation output to the inflatable cushion when the deployable member is fully extended and wherein the first inflation output is provided when the inflatable cushion is not fully deployed.

16. The airbag module as in claim 15, wherein the portion of the deployable member which deploys around the periphery of the inflator is folded within the housing and the at least one vent opening is disposed between the portion of the deployable member and the one end of the deployable member secured to the inflatable cushion.

17. The airbag module as in claim 13, wherein the deployable member comprises an elongated opening for alignment with at least some of the plurality of inflation openings of the inflator and the at least one vent opening.

18. The airbag module as in claim 14, wherein the portion of the deployable member which deploys around the periphery of the inflator is folded within the housing and the deployable member travels around more than ½

of the periphery of the inflator.

19. The airbag module as in claim 13, wherein movement of the deployable member to a fully extended length causes a sensor to provide a signal when the deployable member is pulled to its fully extended length and the fully extended length is a predetermined distance the inflatable cushion inflates in a first direction away from the housing.

20. The airbag module as in claim 19, wherein the sensor is coupled to the deployable member and the signal is provided to a controller, which causes a second stage of the inflator to be fired.

21. An air bag module, comprising:

a housing having at least one vent opening;

an inflatable cushion being stored in an un-deployed position in the housing, the inflatable cushion being configured to be deployed out of the housing;

an inflator for inflating the inflatable cushion, the inflator being in fluid communication with the inflatable cushion and having at least one inflation opening in direct alignment with the at least one vent opening;

a deployable member being configured to cover the at least one vent opening; and

wherein the deployable member blocks the at least one vent opening when the inflatable cushion is not restrained and the at least one inflation opening is in fluid communication with the interior of the inflatable cushion.

22. The airbag module as in claim 21, wherein the deployable member is a tether and the tether blocks the at least one vent opening during an initial phase of deployment of the inflatable cushion and thereafter the at least one vent opening is unblocked by the tether until the inflatable cushion reaches a full deployment configuration.

23. The airbag module as in claim 22, wherein the tether comprises an elongated opening for aligning with the at least one vent opening and the at least one inflation opening of the inflator, wherein the length of the tether is a predetermined distance the inflatable cushion inflates in a first direction away from the housing.

24. The airbag module as in claim 21, wherein the deployable member is a tether and the tether blocks the at least one vent after a portion of an un-deployed length of the tether is extended during an initial phase of deployment of the inflatable cushion and thereafter the at least one vent opening is blocked by the tether wherein the un-deployed length of the tether is a predetermined distance a portion of the inflatable cushion inflates in a first direction away from the housing.

25. The airbag module as in claim 21, wherein the inflator is cylindrically shaped and the inflator comprises a plurality of inflation openings disposed about a periphery of the inflator and the deployable member is configured to have a portion which deploys around the periphery of the inflator, wherein the portion of the deployable member which deploys around the periphery of the inflator is folded within the housing and the at least one vent opening is disposed between the portion of the deployable member and an end of the deployable member secured to the inflatable cushion.

26. A venting assembly for an air bag module having an inflator, an inflatable cushion and a housing, the venting assembly comprising:

a tether being secured to an inner surface of the inflatable cushion at one end and the housing at the other;

wherein the tether allows fluid communication between at least one inflation opening of the inflator and at least one vent opening of the housing prior to deployment of a portion of the inflatable cushion a predetermined distance in a first direction and upon the portion of the inflatable cushion reaching the predetermined distance, the tether prevents fluid communication with the at least one inflation opening of the inflator and the at least one vent opening of the housing.

27. The venting assembly as in claim 26, wherein the tether positions a filter material over the at least one vent opening when the tether is not blocking the at least one vent opening.

28. The venting assembly as in claim 26, wherein the tether comprises an elongated opening for alignment with the at least one inflation opening of the inflator with the at least one vent opening of the housing.

29. The venting assembly as in claim 26, wherein movement of the tether to a fully extended length causes a sensor to provide a signal when the tether reaches its fully extended length, wherein the fully extended length of the tether is a predetermined distance the inflatable cushion inflates in a first direction away from the housing.

30. The venting assembly as in claim 26, wherein the inflator is cylindrically shaped and the inflator comprises a plurality of inflation openings disposed about a periphery of the inflator and the tether is configured to have a portion which deploys around the periphery of the inflator, wherein the portion of the tether which deploys around the periphery of the inflator is folded within the housing and the at least one vent opening is disposed between the portion of the tether and a first end of the tether secured to the inflatable cushion, wherein movement of the tether to a fully extended length causes a sensor to provide a signal when the tether is pulled to its fully extended length and the fully extended length is a predetermined distance the inflatable cushion inflates in a first direction away from the housing, wherein the sensor is coupled to the tether and the signal is provided to a controller, which causes a second stage of the inflator to be fired.

31. The venting assembly as in claim 26, wherein the tether allows direct alignment of the at least one inflation opening of the inflator with the at least one vent opening of the housing prior to full deployment of the inflatable cushion and upon full deployment of the inflatable cushion, the tether blocks direct alignment of the at least one inflation opening of the inflator with the at least one vent opening of the housing.

32. A method for providing venting of an inflation output of an inflator in an airbag module, comprising:

securing one end of a deployable member to a housing, the housing having at least one vent opening;

securing another end of the deployable member to an inflatable cushion being stored in an un-deployed position in the housing, the deployable member being configured, dimensioned and positioned to have a deployable length for deployment within the inflatable cushion in a first direction; and

wherein venting of a portion of the inflation output occurs through the at least one vent opening until a portion of the deployable length of the deployable member is moved as the cushion deploys in the first direction.