Simplified passenger airbag module using the inflator as a structural member

• US 5,941,556 A
• Filed: 04/18/1997
• Issued: 08/24/1999
• Est. Priority Date: 09/16/1996
• Status: Expired due to Term

• Current Assignee: Morton International Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Rose, Larry D.
• Primary Examiner(s): Rice, Kenneth R.
• Application Number:
  US08/844,347
• Time in Patent Office: 858 Days
• Field of Search: 280/728.2, 280/732
• US Class Current: 280/728.2
• 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

Abstract

A simplified, low cost, passenger airbag module that is particularly suited for stamped steel construction and is easy to assemble, uses the inflator as a structural member, specifically, as an axial tension member, requires only one fastener member, and reduces the number of module parts to six (6) (excluding a decorative cover).

Claims

1. In a passenger airbag module comprising

a diffuser/retainer tube having a side that contains at least one aperture and into which diffuser/retainer tube generator means may be inserted, said generator means being of the type responsive to a control signal, for generating gas to inflate an airbag means, and

inflatable means responsive to the gas, for protecting, when activated, an occupant of a vehicle comprising a cushion assembly, said cushion assembly having a gas inlet opening with a loop extending therefrom that is sized to envelop said diffuser/retainer tube, said cushion assembly being disposed in a compacted or stored condition prior to deployment with said gas inlet opening proximate said side of said diffuser/retainer tube that contains at least one aperture, and said loop enveloping said diffuser/retainer tube,

the improvement comprising said diffuser/retainer tube including at least one T-tab that protrudes outwardly from a side thereon remote from said at least one aperture at a position that is intermediate the length of said diffuser/retainer tube,

said diffuser/retainer tube being positioned into said cushion assembly where said at least one T-tab is inserted through at least one small hole that is provided in the loop of said cushion assembly,

a module housing into which said diffuser/retainer tube/cushion assembly is insertable, said module housing having at least one "T" slot which with said at least one T-tab interlocks, which interlocking occurs initially when said diffuser/retainer tube is shifted axially with respect to said module housing.

2. A module housing, as defined in claim 1, wherein said at least one T-tab is formed as part of said diffuser/retainer tube.

3. A module housing, as defined in claim 1, wherein said diffuser/retainer tube includes multiple T-tabs.

4. A module housing, as defined in claim 3, wherein said multiple T-tabs are formed as part of said diffuser/retainer tube.

5. A module housing, as defined in claim 4, wherein said multiple T-tabs are axially spaced along the length of said diffuser/retainer tube.

6. A module housing, as defined in claim 5, wherein multiple holes provided in said loop, and multiple "T" slots provided in said module housing are axially spaced with the same spacing pattern as the spacing of said T-tabs along the length of said diffuser/retainer tube.

7. A module housing, as defined in claim 6, wherein orientation of said cushion assembly to said diffuser/retainer tube is controlled by offsetting one of said T-tabs.

8. A module housing, as defined in claim 1, wherein said cushion assembly in addition to said loop and said at least one small hole therein includes at each end of said loop a panel that is formed integrally therewith that matches the curvature of the associated end of said diffuser/retainer tube.

9. A module housing, as defined in claim 1, wherein said diffuser/retainer tube and said module housing are made of stamped steel.

10. A module housing, as defined in claim 1, wherein said gas generator means includes an elongated inflator having a threaded stud at a first end and a fixed abutment at a second end, and

wherein said module housing includes first and second endwalls which are opposed and each of which have an aperture,

wherein, when the parts of said module housing are in assembled relation, said aperture of said first endwall is closed by said inflator threaded stud and the aperture of said second endwall is closed by said abutment, and

wherein the parts of said module housing are maintained in assembled relation by a single fastener comprising a nut screwed on the portion of said inflator stud that extends through said first endwall of said module housing with the spacing between said endwalls being such relative to the length of said inflator that this causes said abutment to compress said diffuser/retainer tube against said first endwall and to place said inflator under tension.

11. A module housing, as defined in claim 10, wherein said fixed abutment at the second end of said inflator comprises an adapter cup that is fixedly attached thereto.

12. A module housing, as defined in claim 11, wherein said adapter cup is attached to the second end of said inflator in any suitable manner such as by screw threads, a locking ring, or a crimping operation.

13. A module housing, as defined in claim 10, wherein said fixed abutment at the second end of said inflator is an integrally formed flange.