Duplex firing inflator

• US 9,010,803 B2
• Filed: 11/29/2012
• Issued: 04/21/2015
• Est. Priority Date: 11/29/2012
• Status: Active Grant

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Smith, Bradley W., Parkinson, David W., Larsen, Alan R.
• Primary Examiner(s): Dickson, Paul N
• Assistant Examiner(s): GOODEN JR, BARRY J
• Application Number:
  US13/688,893
• Publication Number:
  US 20140144340A1
• Time in Patent Office: 873 Days
• Field of Search: 280/736, 280/737, 280/741, 280/742
• US Class Current: 280/741
• CPC Class Codes: B60R 2021/26029 Ignitors
• CPC Class Codes: B60R 2021/2648 comprising a plurality of combustion chambers or sub-chambers
• CPC Class Codes: B60R 21/264 using instantaneous generation of gas, e.g. pyrotechnic B60R21/268 takes precedence
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder

Abstract

A duplex firing inflator structural component and related assemblies are provided. The component includes a molded element that contains a duplex firing initiator assembly including a primary initiator operatively associated with a primary pyrotechnic output composition and a secondary initiator operatively associated with a secondary pyrotechnic output composition. The component also includes a single connector in electrical operative association with the primary and the secondary initiators.

Claims

1. A structural component for a duplex firing inflator, the duplex inflator having a housing with at least one gas exit port and an external wall having a single mounting opening for use in association with initiator devices or assemblies, the structural component comprising:

a molded element integrally molded with the external wall of the inflator housing at the mounting opening in the external wall, the molded element containing a duplex firing initiator assembly including a primary initiator operatively associated with a primary pyrotechnic output composition and a secondary initiator operatively associated with a secondary pyrotechnic output composition and

a single connector in electrical operative association with the primary and the secondary initiators.

2. The structural component of claim 1 wherein the single connector is a two or a three pin connector.

3. The structural component of claim 1 wherein the primary initiator and the secondary initiator are disposed in horizontal firing placement within the structural component.

4. The structural component of claim 1 wherein the primary initiator and the secondary initiator are disposed in vertical firing placement within the structural component.

5. The structural component of claim 1 wherein the molded element comprises the duplex firing initiator assembly encapsulated in molded plastic.

6. The structural component of claim 1 wherein the molded element additionally comprises at least one cavity or void to form a mold material runner to capture or lock the structural component to an associated inflator assembly component part.

7. A combination of the structural component of claim 6 and the associated inflator assembly component part, the combination additionally comprising:

a mold material disposed in the at least one cavity or void to capture or lock the structural component to the associated inflator assembly component part.

8. The structural component of claim 1 wherein the structural component additionally comprises an ignition booster cup in initiating discharge receiving communication with the primary pyrotechnic output composition.

9. The structural component of claim 8 wherein the molded element forms the ignition booster cup.

10. The structural component of claim 8 wherein the structural component additionally comprises a seal for selective isolation of contents of the ignition booster cup from the primary pyrotechnic output composition.

11. The structural component of claim 10 wherein the molded element forms the seal.

12. The structural component of claim 8 wherein the structural component additionally comprises a plurality of discreet gas exit openings disposed about the ignition booster cup.

13. The structural component of claim 12 wherein the molded element forms at least one of the plurality of discreet gas exit openings.

14. The structural component of claim 12 wherein at least one of the plurality of discreet gas exit openings disposed about the ignition booster cup includes a breakout web to separate contents of the ignition booster cup from gas generant contained with an associated inflator device.

15. The structural component of claim 14 wherein the molded element forms the breakout web.

16. The structural component of claim 8 wherein the molded element is integrally molded with a wall of a dual stage inflator device.

17. The structural component of claim 16 wherein the structural component additionally comprises a second stage gas generant cup for containing a second stage gas generant material ignitable by output from the secondary pyrotechnic output composition upon actuation thereof.

18. The structural component of claim 17 wherein the molded element forms the second stage gas generant cup.

19. A dual stage duplex firing inflator device, comprising:

a housing having at least one gas exit port and a single mounting opening for use in association with initiator devices or assemblies and

the structural component of claim 1 mounted to said single mounting opening,

the inflator device including a first gas generant-containing chamber in reaction initiating communication with the primary initiator and a second gas generant-containing chamber in reaction initiating communication with the secondary initiator.

20. A dual stage duplex firing inflator device, comprising:

a housing having at least one gas exit port and an external wall having a single mounting opening for use in association with initiator devices or assemblies and

a structural component comprising a molded element integrally molded with the external wall of the inflator device at the mounting opening in the external wall, the structural component containing a duplex firing initiator assembly including a primary initiator operatively associated with a primary pyrotechnic output composition and a secondary initiator operatively associated with a secondary pyrotechnic output composition, the structural component including a single connector in electrical operative association with the primary and the secondary initiators, the structural component further including at least one cavity or void to form a mold material runner to capture or lock the structural component to an associated inflator assembly housing element.

21. The dual stage duplex firing inflator device of claim 20, the inflator device additionally comprising:

a mold material disposed in the at least one cavity or void to capture or lock the structural component to the associated inflator assembly housing element.