Inflator with stamped end cap

• US 20050230950A1
• Filed: 04/20/2004
• Published: 10/20/2005
• Est. Priority Date: 04/20/2004
• Status: Abandoned Application

• Current Assignee: TRW Vehicle Safety Systems Incorporated (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: TRW Vehicle Safety Systems Incorporated (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: LaFranier, Jeffrey A., Ruf, Christopher J., Butler, William B., Fischer, Craig M.
• Application Number:
  US10/828,140
• Publication Number:
  US 20050230950A1
• Time in Patent Office: Days
• US Class Current: 280/737
• CPC Class Codes: B60R 2021/26029 Ignitors
• CPC Class Codes: B60R 21/272 with means for increasing the pressure of the gas just before or during liberation, e.g. hybrid inflators
• CPC Class Codes: B60R 21/274 characterised by means to rupture or open the fluid source

Abstract

An inflator (14) includes a structure (20) that helps define a chamber (30) for containing a volume of inflation fluid (32). A closure member (90) is openable to provide fluid communication between the chamber (30) and an exterior of the inflator (14). A stamped end cap (100) is connectable with the structure (20) to help close the chamber (30). The end cap (100) is made of a steel plate material and has a stamped initiator support portion (112). The initiator support portion (112) has a passage (116) that extends through the end cap (100). An initiator (114) is supported in the initiator support portion (112) of the end cap (100).

Claims

1. An inflator comprising:

a structure helping to define a chamber for containing a volume of inflation fluid;

a closure member openable to provide fluid communication between said chamber and an exterior of said inflator;

a stamped end cap connectable with said structure to help close said chamber, said end cap being made of a steel plate material, said end cap having a stamped initiator support portion, said initiator support portion comprising a passage extending through said end cap; and

an initiator supported in said initiator support portion of said end cap.

2. The inflator recited in claim 1, further comprising:

a primary end cap connectable with said structure to help close said chamber, said primary end cap including an outlet passage; and

a primary initiator supported on said primary end cap, said primary initiator on said primary end cap being actuatable to open said closure member, said closure member when opened releasing inflation fluid to flow out of said inflator through said outlet passage.

3. The inflator recited in claim 2, wherein said structure comprises a side wall having a first end portion including a first opening and an opposite second end portion including a second opening, said primary end cap being connected with said first end portion to help close said first opening, said stamped end cap being connected with said second end portion to help close said second opening.

4. The inflator recited in claim 2, wherein said primary initiator comprises a primary ignition source for igniting said inflation fluid and said initiator supported on said stamped end cap comprises a secondary ignition source for igniting said inflation fluid.

5. The inflator recited in claim 4, further comprising means for selectively actuating said secondary ignition source at a predetermined time after actuating said primary ignition source.

6. The inflator recited in claim 1, wherein said structure comprises a cylindrical side wall having an inside diameter and an outside diameter, said end cap comprising a frustoconical side wall with an outside diameter tapered from a first diameter smaller than said inside diameter of said side wall to a second diameter larger than said outside diameter of said side wall, said side wall of said end cap being connectable with said side wall of said structure.

7. The inflator recited in claim 1, wherein said passage of said initiator support portion exposes a portion of the initiator supported in said initiator support portion to said chamber.

8. The inflator recited in claim 1, wherein said initiator support portion of said end cap is adapted to receive a retainer for helping to support the initiator in said initiator support portion.

9. The inflator recited in claim 1, wherein said initiator support portion comprises a side wall defining an annular shoulder for helping to support said initiator.

10. The inflator recited in claim 1, further comprising an initiator retainer connectable with said initiator to form an assembly connectable with said stamped end cap, said initiator support portion comprising an annular shoulder portion against which said initiator retainer is seated when said assembly is connected with said stamped end cap.

11. The inflator recited in claim 1, wherein said initiator support portion includes a side wall having a first portion with a first diameter and a second portion with a second diameter larger than said first diameter, said first and second portions of said side wall helping to define an annular shoulder for helping to support said initiator, said side wall defining a passage that extends through said stamped end cap.

12. The inflator recited in claim 1, wherein said inflation fluid comprises a fuel gas mixture including a mixture of hydrogen and air, said initiator being actuatable to ignite said inflation fluid.

13. The inflator recited in claim 1, wherein said passage provides fluid communication between said initiator support portion and said chamber.

14. The inflator recited in claim 1, wherein said end cap consists essentially of a single homogeneous piece of stamped steel plate material.

15. An inflator comprising:

a structure helping to define a chamber for containing a volume of fluid;

a primary end cap connectable with said structure to help close said chamber, said primary end cap including an outlet passage;

a closure member openable to release said fluid to flow out of said chamber through said outlet passage;

a primary initiator supported on said primary end cap, said primary initiator being actuatable to open said closure member;

a stamped secondary end cap connectable with said structure to help close said chamber, said secondary end cap being made of a steel plate material, said secondary end cap having a stamped initiator support portion; and

a secondary initiator supported in said initiator support portion of said secondary end cap.

16. The inflator recited in claim 15, wherein said volume of fluid comprises a fuel gas mixture stored under pressure, said primary initiator being actuatable to open said closure member and provide a primary ignition source for igniting said fuel gas mixture, said secondary initiator being actuatable to provide a secondary ignition source for igniting said fuel gas mixture.