Inflator flow inhibitor

• US 5,743,556 A
• Filed: 04/02/1997
• Issued: 04/28/1998
• Est. Priority Date: 04/02/1997
• Status: Expired due to Term

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Johnson, Darrin L., Lindsey, David W.
• Primary Examiner(s): Ellis, Christopher P.
• Application Number:
  US08/832,427
• Time in Patent Office: 391 Days
• Field of Search: 280/741, 280/736, 280/742, 222/3, 102/530, 102/531, 422/164
• US Class Current: 280/736
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder

Abstract

An inflator of a vehicle safety restraint system having a flow inhibitor system which forces ignition gases through a gas generant of the inflator. A housing includes a gas generant chamber and an igniter for generating an ignition gas. A gas generant is disposed within the gas generant chamber for generating an inflation gas. A shock absorbing devive supports the gas generant in the housing. The shock absorber is disposed within a region of the gas generant chamber. A flow inhibitor blocks the flow of the ignition gas into the region of the shock absorber. The flow inhibitor is disposed adjacent the shock absorber, such that the ignition gas does not enter the region of the shock absorber but passes solely through the gas generant.

Claims

1. An inflator of a vehicle safety restraint system having a flow inhibitor system which forces ignition gases through a gas generant of the inflator, comprising:

a housing having a gas generant chamber;

means for generating an ignition gas located in the housing;

a gas generant disposed within the gas generant chamber for generating an inflation gas;

means for supporting the gas generant disposed in the housing, the supporting means being disposed within a region of the gas generant chamber; and

means for inhibiting the flow of the ignition gas into the region of the supporting means, wherein the inhibiting means is disposed adjacent the supporting means, such that the ignition gas does not enter the region of the supporting means but passes solely through the gas generant.

2. The inflator of claim 1, wherein the gas generant comprises a stack of concentrically-stacked gas generant grains.

3. The inflator of claim 2, further comprising a center post formed integrally with one end of the housing and extending inwardly into the gas generant chamber.

4. The inflator of claim 3, wherein the center post includes a cavity containing a quantity of auto-ignition material.

5. The inflator of claim 3, wherein each of the gas generant grains include a central aperture, the center post of the housing extending into the aperture of at least one of the gas generant grains.

6. The inflator of claim 3, wherein the supporting means comprises a shock absorbing spring for supporting the stack of gas generant.

7. The inflator of claim 6, wherein the flow inhibiting means comprises a washer closely fitted about the center post and disposed between the stack of gas generant and the spring, wherein the ignition gas is prevented from flowing into the region of the spring by the washer.

8. The inflator of claim 7, wherein the washer is made of a high-temperature resistant material.

9. The inflator of claim 3, further comprising an attachment stud extending outwardly from an end of the housing, the attacment stud including means for aligning and mounting the inflator.

10. The inflator of claim 2, wherein the supporting means comprises a ring-shaped spacer disposed in one end of the housing for supporting the stack of gas generant.

11. The inflator of claim 10, wherein the flow inhibiting means comprises a tube having a hollow stem and a flange.

12. The inflator of claim 11, wherein the means for generating an ignition gas comprises an igniter disposed in the gas generant chamber for igniting the stack of gas generant, wherein upon assembly of the inflator an end of the igniter is disposed within the stem of the tube and the stem is positioned within the spacer.

13. The inflator of claim 12, wherein the spacer is supported on the flange of the tube.

14. The inflator of claim 2, further comprising a filter positioned between the housing and the stack of gas generant in the gas generant chamber.

15. The inflator of claim 14, further comprising a barrier extending into the region of the supporting means between the stack of gas generant and the supporting means for further preventing the ignition gas from entering the region of the supporting means.

16. The inflator of claim 15, wherein the barrier is a layer of high temperature resistant material.

17. An inflator of a vehicle safety restraint system having a flow inhibitor system which forces ignition gases through a gas generant of the inflator, comprising:

a housing having a gas generant chamber;

an igniter for generating an ignition gas located in the housing;

a gas generant disposed within the gas generant chamber for generating an inflation gas;

a shock absorber for supporting the gas generant, the shock absorber being disposed within a region of the gas generant chamber; and

means for inhibiting the flow of the ignition gas into the region of the shock absorber, wherein the inhibiting means is disposed above the shock absorber, such that the ignition gas is prevented from entering the region of the shock absorber but passes solely through the gas generant.