Counter flow inflator

• US 20020175508A1
• Filed: 05/24/2001
• Published: 11/28/2002
• Est. Priority Date: 05/24/2001
• Status: Abandoned Application

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Russell, Thomas J., Hess, Travis B.
• Application Number:
  US09/864,964
• Publication Number:
  US 20020175508A1
• Time in Patent Office: Days
• US Class Current: 280/740
• CPC Class Codes: B60R 2021/2612 Gas guiding means, e.g. ducts
• CPC Class Codes: B60R 21/26 characterised by the inflation fluid source or means to control inflation fluid flow arrangement or mounting thereof to the vehicle B60R21/20; blasting cartridges for producing gas under pressure in general F42B3/04; initiators or igniters therefor F42B3/10
• CPC Class Codes: B60R 21/261 with means other than bag structure to diffuse or guide inflation fluid

Abstract

An inflator having a body, an aperture in the body, and a diffuser housing is disclosed. The body has, or forms, an interior cavity, which may contain gas or gas generant material. The gas generant material is capable of producing gas to inflate, for example, an airbag. A diffuser housing is situated around at least a portion of the body and, in cooperation with the body, forms a gas flow channel. When the gas or gas generant material releases gas, the gas flows from the cavity, through the aperture, into the channel, and exits the channel into an airbag, cooling the gas before it enters the airbag. The inflator may also have an indentation capable of receiving a clamp. The clamp may be secured over an airbag and seated in the indentation to secure the inflator within an airbag. When the inflator is actuated, the gas is pushed away from the inflator such that the inflator is thrust towards the clamp, thereby pushing a broadening portion of the indentation against the clamp and securing the seal between the air bag and the inflator.

Claims

1. An inflator having a proximal end and a distal end, said inflator comprising:

a body, said body having an interior cavity, said interior cavity being configured such that it is capable of containing a quantity of gas or gas generant material;

an aperture disposed in the body;

a diffuser housing disposed about at least a portion of the body and in cooperation with the body, forming a gas flow channel, said channel being configured such that when the inflator is actuated, gas flows from the cavity, through the aperture, and into the channel, and exits the channel.

2. And inflator as defined in claim 1, wherein the gas exits the channel near the distal end of the inflator.

3. An inflator as defined in claim 1, wherein the channel is at least one-half of the length of the inflator.

4. An inflator as defined in claim 1, wherein the channel is configured such when the inflator is actuated, gas flowing out the inflator is cooled as it flows through the channel.

5. An inflator as defined in claim 1, further comprising a plurality of apertures disposed in the body, said apertures being configured to place the cavity in gaseous communication with the channel.

6. An inflator as defined in claim 5, wherein said apertures are located closer to the proximal end of the inflator than to the distal end.

7. An inflator as defined in claim 1, further comprising a quantity of gas or gas generant material disposed within the interior cavity.

8. An inflator as defined in claim 7, wherein the gas or gas generant material is compressed gas.

9. An inflator as defined in claim 7, wherein the gas or gas generant material is a solid gas generant.

10. An inflator as defined in claim 7, wherein the gas or gas generant material comprises a combination of compressed gas and solid gas generant.

11. An inflator was defined in claim 1, wherein the housing comprises an indentation configured such that it is capable of receiving a clamp.

13. And inflator as defined in claim 12, wherein the gas exits the channel near the distal end of the inflator.

14. An inflator as defined in claim 12, wherein the channel is configured such that when the inflator is actuated, gas flowing out the inflator is cooled as it flows through the channel.

15. An inflator as defined in claim 12, further comprising a plurality of apertures disposed in the body, said apertures being configured to place the cavity in gaseous communication with the channel.

16. An inflator as defined in claim 15, wherein said apertures are located closer to the proximal end of the inflator than to the distal end.

17. An inflator as defined in claim 12, further comprising a quantity of gas or gas generant material disposed within the interior cavity.

18. An inflator as defined in claim 17, wherein the gas or gas generant material is compressed gas.

19. An inflator as defined in claim 17, wherein the gas or gas generant material is a solid gas generant.

20. An inflator as defined in claim 17, wherein the gas or gas generant material comprises a combination of compressed gas and solid gas generant.

21. An inflator was defined in claim 12, wherein the housing comprises an indentation configured such that it is capable of receiving a clamp.

12. An inflator having a proximal end and a distal end, said inflator comprising:

a substantially cylindrical body, said body having an interior cavity, said interior cavity being configured such that it is capable of containing a quantity of gas or gas generant material;

at least one aperture disposed in the body;

a diffuser housing disposed about at least a portion of said body and in cooperation with the body, forming a gas flow channel, said channel configured such that it is at least one-half of the length of the inflator, and such that when the inflator is actuated, gas flows from the cavity, through the at least one aperture, and into the channel, and exits the channel.

22. A vehicle airbag apparatus comprising:

an airbag having an inlet;

an inflator capable of being disposed within the inlet of said airbag, said inflator comprising a distal end, a proximal end, and a body, said body having an interior cavity, said interior being configured such that it is capable of containing a quantity of gas or gas generant material;

an aperture disposed in the body; and

a diffuser housing disposed about at least a portion of the body and in cooperation with the body, forming a gas flow channel, said channel being configured such that when the inflator is actuated, gas flows from the cavity, through the aperture, and into the channel, and exits the channel into the airbag near the distal end of the inflator, said housing further comprising an indentation being configured such that it is capable of receiving a clamp.

23. A vehicle airbag apparatus as defined in claim 22, further comprising a clamp positioned about the inlet of the airbag and seated within the indentation of said body such that said curtain and said inflator are secured one to another.

24. A vehicle airbag apparatus inflator as defined in claim 22, wherein the channel is configured such that when the inflator is actuated, gas flowing out the inflator is cooled as it flows through the channel.

25. A vehicle airbag apparatus as defined in claim 22, further comprising a plurality of apertures disposed in the body, the apertures being configured to place the cavity in gaseous communication with the channel.

26. A vehicle airbag apparatus as defined in claim 25, wherein said apertures are located closer to the proximal end of the inflator than to the distal end.

27. A vehicle airbag apparatus as defined in claim 22, further comprising a quantity of gas or gas generant material disposed within the interior cavity.

28. A vehicle airbag apparatus as defined in claim 27, wherein the gas or gas generant material is compressed gas.

29. A vehicle airbag apparatus as defined in claim 27, wherein the gas or gas generant material is a solid gas generant.

30. A vehicle airbag apparatus as defined in claim 27, wherein the gas or gas generant material comprises a combination of compressed gas and solid gas generant.

31. A vehicle airbag apparatus as defined in claim 22, wherein the airbag comprises an inflatable curtain.

32. A method for inflating a vehicle airbag comprising the steps of:

a. providing an airbag;

b. providing an inflator comprising a distal end, a proximal end, and a body, said body having an interior cavity, said interior cavity containing a quantity of gas generant material;

an aperture disposed in the body;

a diffuser housing disposed about at least a portion of the body and in cooperation with the body, forming a gas flow channel, said channel configured such that upon operation of the inflator, gas flows from the cavity, through the aperture, and into the channel, and exits the channel into the airbag near the distal end of the inflator, said housing further comprising an indentation configured such that it is capable of receiving an clamp;

c. placing said inflator in gaseous communication with said airbag; and

d. actuating said inflator such that gas exits said body through said aperture and is directed through said channel into said airbag.

33. A method as defined in claim 32, wherein said gas is cooled as it flows through said channel.

34. A method as defined in claim 32, wherein said airbag comprises an inflatable curtain.

36. A method as defined in claim 35, wherein said gas is cooled as it flows through said channel.

37. A method as defined in claim 35, wherein said airbag comprises an inflatable curtain.

35. A method of inflating an airbag and simultaneously tightening a seal between an inflator and said airbag comprising the steps of:

a. providing an airbag having an inlet;

b. providing an inflator comprising a distal end, a proximal end, and a body, said body having an interior cavity, said interior cavity containing a quantity of gas generant material;

an aperture disposed in the body;

a diffuser housing disposed about at least a portion of the body and in cooperation with the body, forming a gas flow channel, said channel configured such that upon operation of the inflator, gas flows from the cavity, through the aperture, and into the channel, and exits the channel into the airbag near the distal end of the inflator;

said housing further comprising an indentation configured such that it is capable of receiving a clamp, the indentation comprising a narrow section and a broadening section, the narrow section abutting the broadening section and being situated between the proximal end and the broadening section;

c. securing a clamp about the inlet of the airbag, the clamp being seated over the narrow section of the indentation such that said curtain and said inflator are secured one to another and in gaseous communication, creating a seal between the inflator and airbag; and

d. actuating said inflator such that gas exits said body through said aperture and is directed through said channel into said airbag, said gas exiting the inflator near the distal end and in a direction away from the proximal end such that the broadening section is pushed against the clamp, thereby tightening the seal between the inflator and airbag.