Inflator for vehicle protection apparatus

• US 6,543,806 B1
• Filed: 08/03/2000
• Issued: 04/08/2003
• Est. Priority Date: 08/03/2000
• Status: Expired due to Fees

• Current Assignee: Nxgen Technologies LLC
• Original Assignee: Nxgen Technologies LLC
• Inventors: Fink, Michael F.
• Primary Examiner(s): Dickson, Paul N.
• Assistant Examiner(s): Dunn, David R.
• Application Number:
  US09/632,339
• Time in Patent Office: 978 Days
• Field of Search: 280/736, 280/737, 280/741, 280/742, 280/740, 102/530, 102/531, 222/3
• US Class Current: 280/737
• CPC Class Codes: B60R 2021/2633 with a plurality of inflation levels
• CPC Class Codes: B60R 21/272 with means for increasing the pressure of the gas just before or during liberation, e.g. hybrid inflators

Abstract

A pressurized container includes a vessel defining a chamber therein. A housing that is connected to the vessel defines an outlet that is fluidly separated from the chamber by a closure member. A moveable member may be seated within and form a seal with the housing and abut the closure member. Activation of an initiator propels the moveable member through the closure member, thereby fluidly connecting the chamber and the outlet. The pressurized container might include an obstruction partially blocking an outlet path and another initiator that breaks the obstruction when activated, thereby further opening the outlet path. The pressurized container might include a main path fluidly connected to the outlet, a first secondary path that connects the main path to the chamber, and a second secondary path that also connects the main path to the chamber. If the pressurized container includes two secondary paths, a first closure member can fluidly separate the outlet from the chamber of the vessel along the first secondary path, and a second closure member can fluidly separate the outlet from the chamber of the vessel along the second secondary path. Also, the chamber might include a first portion and a second portion, wherein an isolator member substantially fluidly separates the first portion and the second portion.

Claims

1. A pressurized container comprising:

a hollow vessel defining a chamber therein, the chamber having first and second portions separated by an isolator member which includes a passage therethrough fluidly connecting the first and second portions;

a housing connected to the vessel, the housing defining an outlet;

a closure member connected to the housing and fluidly separating the outlet from the chamber of the vessel;

a moveable member seated within and forming a seal with the housing and abutting the closure member; and

an initiator connected to the housing, the initiator comprising a pyrotechnic charge housed within a body;

wherein activation of the initiator ignites the charge, thereby producing expanding gases that burst the body and propel the moveable member through the closure member, thereby fluidly connecting the first portion of the chamber and the outlet to release pressurized gas within the chamber from the first portion of the chamber with sufficient volume to completely inflate an air bag of an automobile, and to release the pressurized gas within the chamber from the second portion of the chamber to maintain the inflation of the air bag of the automobile.

2. The pressurized container of claim 1, wherein the moveable member is a projectile, and wherein the moveable member breaks through the closure member before breaking the seal with the housing.

3. The pressurized container of claim 1, wherein the moveable member comprises a radial wall and a circumferential wall extending from a periphery of the radial wall, wherein the circumferential wall and the radial wall define a cavity.

4. The pressurized container of claim 3, wherein a portion of the initiator is seated within the cavity.

5. The pressurized container of claim 3, wherein the radial wall abuts the closure member.

6. The pressurized container of claim 1, wherein the closure member comprises a first side and a second side, and wherein the moveable member abuts the first side of the closure member and the second side of the closure member faces the chamber.

7. The pressurized container of claim 1, wherein a portion of the housing and the closure member are a single unitary member.

8. The pressurized container of claim 7, wherein the housing and the vessel are joined by an inertia or friction weld.

9. The pressurized container of claim 1, wherein the vessel, the closure member, and a portion of the housing are a single unitary member.

10. The pressurized container of claim 1, wherein the vessel comprises aluminum formed by an impact process.

11. The pressurized container of claim 1, wherein the housing comprises aluminum formed by forging.

12. A pressurized container comprising:

a hollow vessel defining a chamber therein, the chamber comprising a first portion and a second portion;

an isolator member substantially fluidly separating the first portion and the second portion;

a passage fluidly connecting the first portion of the chamber and the second portion of the chamber;

a housing connected to the vessel, the housing defining an outlet;

a closure member fluidly separating the outlet from the first portion of the chamber of the vessel; and

an initiator at least partially contained within the housing;

wherein activation of the initiator breaks the closure member, thereby fluidly connecting the first portion of the chamber and the outlet to release pressurized gas within the chamber from the first portion of the chamber with sufficient volume to completely inflate an air bag of an automobile, and to release the pressurized gas within the chamber from the second portion of the chamber to maintain the inflation of the air bag of the automobile.

13. The pressurized container of claim 12, wherein the chamber is filled with a pressurized gas comprising a mixture of helium and carbon dioxide, and wherein after the closure member is broken, the pressurized gas within the first portion of the chamber escapes through the outlet and the pressurized gas within the second portion escapes through the passage, through the first portion of the chamber, and through the outlet.

14. The pressurized container of claim 12, wherein the chamber is filled with a pressurized gas comprising a mixture of helium and argon, and wherein after the closure member is broken, the pressurized gas within the first portion of the chamber escapes through the outlet and the pressurized gas within the second portion escapes through the passage, through the first portion of the chamber, and through the outlet.

15. The pressurized container of claim 12, wherein the isolator member is a plate, and wherein the passage is a hole defined by the plate.

16. The pressurized container of claim 12, further including a projectile seated within the housing and abutting the closure member, wherein activation of the initiator propels the projectile through the closure member and out of the housing, thereby fluidly connecting the first portion of the chamber and the outlet.

17. The pressurized container of claim 16, wherein the projectile breaks through the closure member before breaking a seal between the projectile and the housing.

18. The pressurized container of claim 16, wherein the projectile comprises a radial wall and a circumferential wall extending from a periphery of the radial wall, and wherein the circumferential wall and the radial wall define a cavity.

19. The pressurized container of claim 18, wherein a portion of the initiator is seated within the cavity.

20. The pressurized container of claim 18, wherein the radial wall abuts the closure member.

21. The pressurized container of claim 12, wherein the closure member comprises a first side and a second side, and wherein a moveable member abuts the first side of the closure member and the second side of the closure member faces the chamber.

22. The pressurized container of claim 12, wherein the housing and the closure member are a single unitary member.

23. The pressurized container of claim 22, wherein the housing and the vessel are joined by an inertia or friction weld.

24. The pressurized container of claim 12, wherein the vessel, the closure member, and the housing are a single unitary member.

25. The pressurized container of claim 12, wherein the vessel comprises aluminum formed by an impact process.

26. The pressurized container of claim 12, wherein the housing comprises aluminum formed by forging.

27. A pressurized container comprising:

a hollow vessel defining a chamber therein, the chamber comprising a first portion and a second portion;

an isolator member substantially fluidly separating the first portion and the second portion;

a passage fluidly connecting the first portion of the chamber and the second portion of the chamber;

a pressurized gas within the chamber, the pressurized gas comprising a mixture of helium and carbon dioxide;

a housing connected to the vessel, the housing defining an outlet;

a closure member connected to the housing and fluidly separating the outlet from the chamber of the vessel; and

an initiator connected to the housing;

wherein activation of the initiator breaks the closure member, thereby fluidly connecting the first portion of the chamber and the outlet such that the pressurized gas within the first portion escapes from the chamber through the outlet at a first rate, pressurized helium gas within the second portion of the chamber escapes at a second rate, and pressurized carbon dioxide within the second portion of the chamber escapes at a third rate slower than the first and second rates.

28. The pressurized container of claim 27, further including a projectile seated within the housing and abutting the closure member, wherein activation of the initiator propels the projectile through the closure member and out of the housing, thereby fluidly connecting the first portion of the chamber and the outlet.

29. The pressurized container of claim 28, wherein the projectile breaks through the closure member before breaking a seal between the projectile and the housing.

30. A pressurized container comprising:

a hollow vessel defining a chamber therein separated into first and second portions by an isolator member which includes a passage therethrough fluidly connecting the first and second portions;

a pressurized gas within the chamber, the pressurized gas comprising a mixture of at least a first gas and a second gas, the second gas having a molecule size larger than that of the first gas;

a housing connected to the vessel, the housing defining an outlet fluidly separated from the chamber by a closure member; and

an initiator connected to the housing;

wherein the pressurized chamber is configured such that activation of the initiator breaks the closure member, thereby fluidly connecting the first portion of the chamber and the outlet to release the pressurized gas within the chamber from the first portion of the chamber at a first flow rate and with sufficient volume to completely inflate an air bag of an automobile, to release the first gas from the second portion of the chamber at a second flow rate, and to release the second gas from the second portion of the chamber at a third flow rate slower than the first and second flow rates.

31. The pressurized container of claim 30, wherein the gas mixture comprises Helium and Argon.

32. The pressurized container of claim 30, wherein the first gas is Helium and the second gas is Carbon Dioxide.

33. The pressurized container of claim 30, wherein the pressurized container is further configured to release the first and second gases from the second portion of the chamber with sufficient volume to maintain the air bag of the automobile completely inflated for a time after the pressurized gas within the first portion of the chamber completely inflates the air bag.

34. A pressurized container for an air bag, the pressurized container comprising:

a hollow vessel defining a chamber having first and second portions separated by an isolator member which includes a passage therethrough fluidly connecting the first and second portions;

a pressurized gas within the chamber;

an initiator within a housing having an outlet, the housing connected to the chamber and the initiator and outlet separated from the first portion by a closure member;

wherein the pressurized container is configured such that activation of the initiator breaks the closure member thereby fluidly connecting the first portion of the chamber and the outlet to release the pressurized gas within the chamber from the first portion of the chamber at a first flow rate and with sufficient volume to completely inflate the air bag of an automobile, and to release the pressurized gas within the chamber from the second portion of the chamber at a second flow rate different from the first flow rate to maintain the inflation of the air bag of the automobile.

35. The pressurized container of claim 34, wherein the pressurized gas within the chamber is a mixture of at least a first gas and a second gas, the second gas having a molecule size larger than that of the first gas.

36. The pressurized container of claim 35, wherein the gas mixture comprises Helium and Argon.

37. The pressurized container of claim 35, wherein the first gas is Helium and the second gas is Carbon Dioxide.