Pyrotechnic cup

• US 7,845,278 B2
• Filed: 01/14/2008
• Issued: 12/07/2010
• Est. Priority Date: 01/14/2008
• Status: Expired due to Fees

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Ayers, Mike, Brisighella, Dario G. Jr.
• Primary Examiner(s): HAYES, BRET C
• Application Number:
  US12/008,793
• Publication Number:
  US 20090179408A1
• Time in Patent Office: 1,058 Days
• Field of Search: 102/202.5, 102/202.7, 102/202.8, 102/202.9, 102/202.11, 102/202.12, 102/202.14, 102/204, 102/530, 102/531, 280/741
• US Class Current: 102/202.5
• CPC Class Codes: B60R 2021/26029 Ignitors
• 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 21/264 using instantaneous generation of gas, e.g. pyrotechnic B60R21/268 takes precedence
• CPC Class Codes: F42B 3/04 for producing gas under pressure generators of inflation fluid especially adapted for vehicle air bags B60R21/26

Abstract

The pyrotechnic cup is designed such that it may be used as part of an airbag initiator. In some embodiments, the cup comprises a cylindrical portion and a dome that is attached to a first end of the cylindrical portion. A cruciform is also added to the cup. The cruciform is positioned at the apex of the dome. In some embodiments, the cruciform comprises one or more petals. Other embodiments may be designed in which deployment of the initiator causes gas to be directed out of the pyrotechnic cup via the apex of the dome.

Claims

1. A pyrotechnic cup designed for use as part of an initiator, the cup comprising:

a cylindrical portion, the cylindrical portion including a crimped bend configured to unfold without rupturing at the crimped bend during deployment of the initiator;

a dome having a top piece with an apex and a tapered portion, the tapered portion of the dome being disposed between a first end of the cylindrical portion and the top piece; and

a cruciform, at least a portion of the cruciform being positioned on a portion of the cylindrical portion, the cruciform configured to open during deployment of the initiator.

2. A pyrotechnic cup as in claim 1 wherein the cruciform defines one or more petals.

3. A pyrotechnic cup as in claim 1 wherein the top piece of the dome is substantially flat.

4. A pyrotechnic cup as in claim 1 further comprising a projection welding flange positioned at a second end of the cylindrical portion.

5. A pyrotechnic cup as in claim 4 wherein the diameter of the projection welding flange is greater than the diameter of the cylindrical portion.

6. A pyrotechnic cup as in claim 1 wherein the cup houses a squib and a quantity of combustible material.

7. A pyrotechnic cup as in claim 1, wherein the crimped bend is intermediate of the dome and a projection welding flange that is positioned at a second end of the cylindrical portion.

8. A pyrotechnic cup as in claim 1 wherein upon deployment of the initiator, gas is directed out of the pyrotechnic cup via the apex of the dome.

9. A pyrotechnic cup as in claim 1, wherein the cruciform comprises a weakened area of the cup.

10. A pyrotechnic cup as in claim 1, wherein at least a portion of the cruciform is positioned on the cylindrical portion.

11. A pyrotechnic cup as in claim 1, wherein the crimped bend comprises an overlapped portion that is folded either inwardly or outwardly.

12. A pyrotechnic cup as in claim 1, wherein the overlapped portion unfolds and the cylindrical portion telescopes out from a base during deployment.

13. An initiator for use with an airbag inflator, the initiator comprising:

a squib;

a quantity of combustible material, wherein the combustible material is ignited by the squib during deployment;

a pyrotechnic cup that houses the squib and the combustible material, wherein the cup comprises, a cylindrical portion including a crimped bend, wherein the crimped bend unfolds without rupturing at the crimped bend during deployment of the initiator, a dome attached to a first end of the cylindrical portion, a cruciform having at least a portion of which being positioned on a portion of the pyrotechnic cup other than the top piece, and a projection welding flange positioned at a second end of the cylindrical portion, wherein the projection welding flange attaches the pyrotechnic cup to the squib.

14. A pyrotechnic cup as in claim 13 wherein the crimped bend expands as a result of ignition of the combustible material.

15. A pyrotechnic cup as in claim 13 wherein the diameter of the projection welding flange is greater than the diameter of the cylindrical portion.

16. A pyrotechnic cup as in claim 13, wherein the cruciform comprises a weakened area of the dome.

17. A pyrotechnic cup as in claim 13, wherein the cruciform is positioned on an outer surface of the dome.

18. A method for preventing fragmentation of a pyrotechnic cup in an inflator, the method comprising:

obtaining a pyrotechnic cup, the cup comprising;

a cylindrical portion including a crimped bend, wherein the crimped bend unfolds without rupturing at the crimped bend during deployment of the initiator;

a dome having an apex, the dome attached to a first end of the cylindrical portion; and

a cruciform positioned at the apex of the dome and extending into the tapered portion of the dome; and

positioning the cup around a squib and a combustible material, wherein at least one of the dome or the crimped bend prevents fragmentation of the cup.

19. A pyrotechnic cup designed for use as part of an initiator, the cup comprising:

a cylindrical portion;

a dome having an apex, the dome attached to a first end of the cylindrical portion;

a cruciform; and

a crimped bend that expands without bursting at the crimped bend during deployment of the initiator, wherein the crimped bend is intermediate of the dome and a projection welding flange that is positioned at a second end of the cylindrical portion.