Inflator assembly having partitioning member redirecting gas flow

• US 5,496,064 A
• Filed: 04/28/1995
• Issued: 03/05/1996
• Est. Priority Date: 04/26/1994
• Status: Expired due to Fees

• Current Assignee: Key Safety Systems, Inc. (Ningbo Junsheng Investment Group Co., Ltd.)
• Original Assignee: Breed Automotive Technology, Inc. (Ningbo Junsheng Investment Group Co., Ltd.)
• Inventors: Osborne, Scott, Burgi, Anthony C., Bates, Roger E.
• Primary Examiner(s): Tyson, Karin L.
• Application Number:
  US08/430,221
• Time in Patent Office: 312 Days
• Field of Search: 280/736, 280/737, 280/740, 280/741, 422/164, 422/165, 422/166, 102/530, 102/531
• US Class Current: 280/740
• CPC Class Codes: B60R 2021/26029 Ignitors
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder

Abstract

An inflator includes a housing formed by two cups interlocked to provide a tamper-proof enclosure with at least one of the cups formed with indentations for grasping by a tool to facilitate assembly of the cups. In a chamber of the housing is an initiator secured in place by a snap-fit. A canister containing tablets of gas generating material is held in the chamber by an interference fit. A filter is held in place in the housing by a ring-shaped retainer member. Passages within the housing direct gases from the initiator to the canister through the filter out of the housing into an air bag with the path of travel changing direction by at least 90° to create turbulent flow for enhanced inflator gas production.

Claims

1. A gas assembly inflator comprising:

a housing formed of a annular inner wall, an annular outer wall, disposed about a common longitudinal axis, and a first and second circular bases attached to said inner and outer wall and axially spaced from each other to form a central chamber disposed coaxially with said longitudinal axis and an annular chamber disposed about said central chamber and separated therefrom by said inner wall, said inner wall having a plurality of inner holes directed radially and axially outward of said inner chamber;

an initiator disposed in said inner chamber for generating primer gas;

a partitioning member for partitioning said outer chamber into a first portion and a second portion, said partitioning member having partition holes, and the partitioning member extending radially to the outer wall;

a canister enclosing gas generator material disposed in said first portion, said material receiving said primer gas through said inner holes, said canister having a first section having a radial dimension substantially larger than a second section to define an L-shaped cross section, the partitioning member being provided with an axial section engaging an axial section of the second section of the canister, wherein the canister is radially disposed between the inner wall and the partitioning member; and

a filter media disposed in said second portion and receiving gases from said first portion through said partition holes;

said inner and partition holes defining respectively a first and second gas path, the gas paths being disposed at a path angle of at least 90°

; and

said outer wall being formed with a plurality of exit holes for dispensing gases through said filter media.

2. The assembly of claim 1 wherein said inner holes are oriented at an inner angle of 45°

with respect to said axis.

3. The assembly of claim 1 wherein said partition holes are parallel to said axis.

4. The assembly of claim 1 wherein said exit holes are normal to said partition holes.

5. The assembly of claim 1 wherein said exit holes are angularly spaced from said partition holes.

6. The assembly of claim 1 wherein said partitioned member is a ring in contact with said first section.

7. The assembly of claim 6 wherein said ring is disposed in a plane is normal to said longitudinal axis.

8. The assembly of claim 1 where said canister has a first sidewall made of a foil arranged and constructed to burst when a gas flows toward said canister from said inner walls.

9. The assembly of claim 8 wherein said canister has a second sidewall which bursts adjacent to said partition holes when gas is produced by said gas generating media thereby allowing gases to flow from the canister through said partition holes.