AIRBAG WITH STOP LEAK MATERIAL

• US 20090236835A1
• Filed: 03/18/2008
• Published: 09/24/2009
• Est. Priority Date: 03/18/2008
• Status: Active Grant

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Jordan, Michael P., Smith, Bradley W., Parks, Brent
• Granted Patent: US 7,942,438 B2
• Time in Patent Office: Days
• US Class Current: 280/734
• CPC Class Codes: B60R 21/231 characterised by their shape, construction or spatial configuration
• CPC Class Codes: B60R 21/232 Curtain-type airbags deploying mainly in a vertical direction from their top edge

Abstract

An inflatable cushion assembly for deployment in a vehicle. The assembly has an inflator, an inflatable cushion, and particles of a stop leak material. Upon deployment, the stop leak material becomes temporarily dispersed by and suspended in inflation gas such that the cushion is rendered less porous to inflation gas.

Claims

1. An inflatable cushion assembly comprising:

an inflator configured to generate inflation gas in response to predetermined conditions;

an inflatable cushion coupled to, and in fluid communication with the inflator, the inflatable cushion comprising opposing sides which define a void for receiving the inflation gas, wherein the sides each comprise a woven material;

particulate stop leak material disposed within the inflatable cushion assembly, wherein the particles of stop leak material comprise one or more substances, and a majority of the particles comprise a planar shape, the particles of stop leak material being configured to become dispersed by and temporarily suspended in the inflation gas during inflatable cushion deployment such that the particles of stop leak material are at least partially distributed throughout the inflatable void in the inflatable cushion, the particles of stop leak material being configured to reduce the porosity of the cushion.

2. The inflatable cushion assembly of claim 1, wherein before the inflator is activated the stop leak material is disposed within the inflatable cushion.

3. The inflatable cushion assembly of claim 1, wherein the assembly further comprises at least one inflator tube coupled to the inflator and configured to channel inflation gas from the inflator to the inflatable cushion.

4. The inflatable cushion assembly of claim 3, wherein before activation of the inflator, the stop leak material is disposed within the at least one inflator tube.

5. The inflatable cushion assembly of claim 1, wherein the inflatable cushion further comprises a throat liner that is attached directly to the inflator such that the throat portion fluidly connects the inflator with the void of the inflatable cushion.

6. The inflatable cushion assembly of claim 5, wherein the throat liner comprises tear stitching that is configured to close at least one throat liner exit such that before inflator activation the stop leak material is retained within the throat liner and wherein after inflator activation, the tear stitching is at least partially ruptured such that the stop leak material can enter the inflatable cushion via the throat liner exit.

7. The inflatable cushion assembly of claim 6, wherein the throat liner comprises two exits that are closed by tear stitching such that prior to inflator activation the stop leak material is retained within the throat liner, and wherein after inflator activation, the tear stitching at least partially ruptures such that inflation gas and the stop leak material can enter the inflatable cushion via the exits.

8. The inflatable cushion assembly of claim 5, wherein the throat liner comprises an inflator tube that is located within the throat liner, the inflator tube comprising:

a first end; and

,

a second end, wherein the second end comprises a coupler that is configured to allow the inflator and the inflator tube to be fluidly coupled.

9. The inflatable cushion assembly of claim 8, wherein before inflator activation, the stop leak material is located within and retained within the inflator tube, and after inflator activation the stop leak material exits the inflator tube.

10. The inflatable cushion assembly of claim 5, wherein the inflatable cushion comprises an inflatable curtain cushion.

11. The inflatable cushion assembly of claim 1, wherein the stop leak material comprises particles of a mesh size range of between 6 and 100.

12. The inflatable cushion assembly of claim 11, wherein the stop leak material comprises particles of a mesh size range of between 8 and 30.

13. The inflatable cushion assembly of claim 1, wherein the stop leak material comprises particles with a ratio of length to thickness of greater than 10:

1

14. The inflatable cushion assembly of claim 1, wherein the stop leak material is not agglomerated and remains suspendable after exposure to 95% relative humidity at 90°

C., 107°

C., and cycling between −

40°

C. and +107°

C.

15. The inflatable cushion assembly of claim 1, wherein the stop leak material comprises particles of mica flake.

16. The inflatable cushion assembly of claim 1, wherein the stop leak material coats an inside surface of the inflatable cushion thereby at least partially blocking at least one aperture in the inflatable cushion.

17. The inflatable cushion assembly of claim 16, wherein the at least one aperture comprises apertures located between threads of the woven material of the inflatable cushion.

18. The inflatable cushion assembly of claim 16, wherein the at least one aperture comprises apertures located between stitches which define a seam in the inflatable cushion and the woven material that defines the inflatable cushion.

19. An inflatable cushion assembly comprising:

an inflator configured to generate inflation gas in response to predetermined conditions;

an inflatable cushion fluidly coupled to the inflator, wherein the inflatable cushion comprises a membrane that defines an inflatable void, the inflatable cushion further comprising;

at least one inflation cell that partially defines the inflatable void; and

,

a throat portion that partially defines the inflatable void;

at least one throat liner that couples the inflator to the inflatable void, wherein at least a portion of the throat liner is located within the throat portion of the inflatable cushion; and

,

particles of stop leak material, wherein the particles comprises one or more substances, and wherein the particles of stop leak material are configured to become at least partially dispersed within the inflatable cushion such that the particles may at least partially block inflation gas leaks in the inflatable cushion such that the porosity of the inflatable cushion to inflation gas is reduced.

20. The inflatable cushion assembly of claim 19, wherein the particles of stop leak material become dispersed due to the inflatable cushion membrane changing conformation from a packaged state to a deployed state.

21. The inflatable cushion assembly of claim 19, wherein the stop leak particles are at least partially located along a path of inflation gas travel such that upon inflator activation, the inflation gas temporarily suspends the particles and at least partially disperses the particles within the inflatable void of the cushion membrane.

22. The inflatable cushion assembly of claim 21, wherein the inflatable cushion comprises an inflatable curtain cushion.

23. The inflatable cushion assembly of claim 22, wherein prior to inflator activation, the stop leak particles are located within the throat liner and are retained within the throat liner by tear stitching that closes one or more exits of the throat liner, and wherein upon inflator activation, the tear stitching at least partially ruptures such that the inflation gas and the stop leak particles may enter the inflatable void of the cushion membrane via the one or more exits.

24. The inflatable cushion assembly of claim 22, wherein the throat liner further comprises an inflator tube that is located at least partially within the throat liner, and wherein before inflator activation, the particles of stop leak material are located within the inflator tube.

25. The inflatable cushion assembly of claim 19, wherein the stop leak material is wrapped and retained by a wrapper, which is disposed within the at least one throat liner.

26. The inflatable cushion assembly of claim 21, wherein the inflatable cushion further comprises tear stitching configured to retain the stop leak material particles in the path of inflation gas travel, wherein the tear stitching is located at a portion of the inflation cell through which inflation gas may pass to inflate the inflation cell, the tear stitching also configured to at least partially rupture after inflator activation such that the stop leak material is carried into and dispersed within the inflation cell by the inflation gas.

27. The inflatable cushion assembly of claim 19, wherein the substance that comprises the stop leak particles is mica.

28. The inflatable cushion assembly of claim 19, wherein before assembly, the inflatable cushion is coated with a substance other than the stop leak material to reduce the porosity of the inflatable cushion.

29. An inflatable cushion assembly comprising:

an inflator configured to generate gas in response to predetermined conditions;

an inflatable cushion inflatably coupled to the inflator, the inflatable cushion comprising a membrane, which defines an inflatable void which receives inflation gas from the inflator, wherein the membrane comprises at least one inflation cell;

at least one inflator tube coupled to the inflator and extending to the inflatable cushion, the inflator tube configured to channel inflation gas from the inflator to the inflatable cushion; and

,

stop leak material particles freely disposed within the at least one inflator tube, the majority of stop leak material particles comprising a planar shape, the stop leak material particles configured to become temporarily dispersed by and suspended in the inflation gas during inflatable deployment such that the stop leak material particles are at least partially distributed throughout the inflatable void of the at least one inflatable cushion inflation cell, the stop leak material configured to reduce the porosity of the cushion.

30. The inflatable cushion assembly of claim 29, wherein the inflatable cushion comprises an inflatable curtain cushion.

31. The inflatable cushion assembly of claim 29, wherein the assembly further comprises a throat liner that is attached to the inflatable cushion membrane and at least partially receives the at least one inflator tube.

32. The inflatable cushion assembly of claim 29, wherein the stop leak material particles comprise mica particles.

33. The inflatable cushion assembly of claim 29, wherein an inflatable cushion proximal end of the at least one inflator tube is obstructed such that the stop leak material particles may not exit the inflator tube prior to inflator activation, however upon inflator activation, the obstruction is at least partially removed by the force of inflation gas, thereby allowing the dispersal of the stop leak material particles.

34. The inflatable cushion assembly of claim 29, wherein the obstruction comprises a thin foil adhesive component disposed on the outside of the inflator tube and covering an aperture that comprises the interior void of the inflator tube.

35. The inflatable cushion assembly of claim 29, wherein the obstruction comprises a plug, which fits within an inflatable cushion-proximal aperture of the inflator tube.

36. The inflatable cushion assembly of claim 29, wherein the obstruction comprises a cap that fits over an aperture in the inflator tube, wherein the aperture is disposed on an inflatable cushion-proximal end of the inflator tube.

37. The inflatable cushion assembly of claim 29, wherein the inflator tube further comprises a diffuser disposed on the at least one inflatable cushion throat portion.