Overflow channeling reaction canister assembly

• US 5,564,738 A
• Filed: 08/10/1995
• Issued: 10/15/1996
• Est. Priority Date: 08/10/1995
• Status: Expired due to Term

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Morton International Incorporated (Autoliv Incorporated)
• Inventors: Johnson, Darrin L.
• Primary Examiner(s): Johnson, Brian L.
• Assistant Examiner(s): English, Peter C.
• Application Number:
  US08/512,591
• Time in Patent Office: 432 Days
• Field of Search: 280/728.2, 280/739, 280/738, 280/740, 280/736, 280/741, 280/732, 280/737, 280/742, 102/530, 102/531, 422/164, 422/165, 422/166, 422/167
• US Class Current: 280/736
• CPC Class Codes: B60R 21/2171 specially adapted for elongated cylindrical or bottle-like inflators with a symmetry axis perpendicular to the main direction of bag deployment, e.g. extruded reaction canisters B60R21/2176 takes precedence
• CPC Class Codes: B60R 21/276 with means to vent the inflation fluid source, e.g. in case of overpressure B60R21/30 takes precedence; venting means on inflatable member walls B60R21/239

Abstract

A reaction canister assembly for use in an inflatable airbag module system comprises a reaction canister housing having at least one open side and an inflator chamber. An inflator is disposed in the inflator chamber and includes a plurality of perforations or ports for passing excess gas generated within the inflator into the canister housing. At least one endplate partially closes the open side of the canister to leave an excess gas outlet passage at the open side of the housing. At least one overflow channel extends along a length of the housing for filtering and cooling the excess gas generated by the inflator. The excess gas passes through the ports of the inflator into the overflow channels and is discharged through the excess gas outlet passage at the open side of the housing.

Claims

1. A reaction canister assembly for use in an inflatable airbag module system, comprising:

a reaction canister housing having at least one open end and an inflator chamber;

an inflator disposed in said inflator chamber, said inflator including means for passing excess gases generated within the inflator into said canister housing;

at least one endplate partially closing the at least one open end of said canister housing to leave at least one excess gas outlet passage at the at least one open end of the canister housing for venting the excess gases from the at least one open end of the canister housing; and

means disposed in said canister housing for filtering and cooling the excess generated gates, the filtering and cooling means comprising at least one channel formed by and extending along a length of the canister housing, wherein the excess gases generated by the inflator pass through the passing means into said at least one channel and is discharged through the at least one excess gas outlet passage at the at least one open end of the canister housing.

2. The reaction canister assembly of claim 1, wherein said means for passing excess gases generated comprises a plurality of ports disposed in a housing of the inflator.

3. The reaction canister assembly of claim 2, further comprising a first layer of gas rupturable foil covering at least some of said ports.

4. The reaction canister assembly of claim 3, wherein the plurality of ports range in diameter from 0.09 mm to 0.13 mm.

5. The reaction canister assembly of claim 3, wherein each of the plurality of ports has an equal diameter.

6. The reaction canister assembly of claim 5, wherein at least some of the plurality of ports are covered by a second layer of gas rupturable foil.

7. The reaction canister assembly of claim 1, wherein an inner surface of the at least one channel includes a surface roughness to improve the filtering and cooling of the excess generated gases.

8. The reaction canister assembly of claim 1, further comprising a screen disposed along an inner surface of the at least one channel to improve the filtering and cooling of the excess generated gases.

9. A method of venting filtered and cooled excess gas generated from an inflatable airbag module system, comprising the steps of:

generating excess gas from an inflator of a reaction canister assembly of the inflatable airbag module system, the reaction canister assembly including a reaction canister housing having at least one open end, at least one endplate partially closing the at least one open end of the canister housing and an inflator chamber for receiving the inflator;

passing the excess generated gas from means disposed in the inflator into filtering and cooling means of the reaction canister housing, the filtering and cooling means comprising at least one channel formed by and extending along a length of the canister housing;

filtering and cooling the excess generated gas in the at least one channel; and

venting the filtered and cooled excess generated gas from the at least one open end of the reaction canister housing.