Airbag module with pressure relief adaptive performance

• US 5,918,901 A
• Filed: 02/18/1997
• Issued: 07/06/1999
• Est. Priority Date: 02/18/1997
• Status: Expired due to Term

• Current Assignee: Morton International Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Johnson, Darrin L., Harris, Bradley D., Lauritzen, Donald R.
• Primary Examiner(s): Rice, Kenneth R.
• Application Number:
  US08/802,803
• Time in Patent Office: 868 Days
• Field of Search: 280/739, 280/738, 280/731, 280/732
• US Class Current: 280/739
• CPC Class Codes: B60R 2021/2177 Reaction canisters characterised by material
• CPC Class Codes: B60R 2021/2765 comprising means to control the venting
• 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

An airbag module providing adaptive performance. The module includes a housing defining an interior. At least an inflator is received within the housing, and preferably the folded, uninflated cushion, also. Various arrangements are provided to selectively block, or create, a vent extending through the housing. This vent, when open, permits the inflation gas provided by the inflator to exit the housing without entering the cushion. The vent may be initially open, and blocked by a sliding cover block, may be initially closed and opened by movement of a slide plug, or may be initially closed and opened by deformation of a portion of the housing. The venting of the inflation gas will at least slow the rate of inflation of the cushion, and may reduce the final pressure within the cushion. As such, the housing will be vented for less severe collisions, and will not be vented for more severe collisions.

Claims

1. A method of providing adaptive performance in an airbag module having a housing defining an interior, an inflator mounted within said interior, and a cushion operatively connected to said housing, comprising the steps of:

activating said inflator to produce a quantity of inflation gas; and

selectively taking an action from the group consisting of

     1) opening a housing vent in said housing to permit a portion of said inflation gas to vent from said housing vent, and

     2) closing a housing vent in said housing to prevent said inflation gas from venting from said housing vent,

said action further including providing a slide block mounted to said housing for movement between first and second positions, in said first position said slide block being either in covering relation to said housing vent or in spaced relation to said housing vent, and in said second position said slide block being in the other of said covering relation to said housing vent or said spaced relation to said housing vent, and selectively moving said slide block from said first to said second position.

2. A method as in claim 1, wherein said step of selectively moving said slide block further includes providing an initiator adjacent to said side block in operative relation such that activation of said initiator causes said slide block to move from said first to said second position, and selectively activating said initiator.

3. A method of providing adaptive performance in an airbag module having a housing defining an interior, an inflator mounted within said interior, and a cushion operatively connected to said housing, comprising the steps of:

activating said inflator to produce a quantity of inflation gas; and

selectively taking an action from the group consisting of

     1) opening a housing vent in said housing to permit a portion of said inflation gas to vent from said housing vent, and

     2) closing a housing vent in said housing to prevent said inflation gas from venting from said housing vent,

said action further including providing a slide plug mounted to said housing from movement between first and second positions, in said first position said slide plug being either in covering relation to said housing vent or in spaced relation to said housing vent, and in said second position said slide plug being in the other of said covering relation to said housing vent or said spaced relation to said housing vent, and selectively moving said slide plug from said first to said second position.

4. A method as in claim 3, wherein said step of selectively moving said slide plug further includes providing an initiator adjacent to said side plug in operative relation such that activation of said initiator causes said slide plug to move from said first to said second position, and selectively activating said initiator.

5. A method of providing adaptive performance in an airbag module having a housing defining an interior, an inflator mounted within said interior, and a cushion operatively connected to said housing, comprising the steps of:

activating said inflator to produce a quantity of inflation gas; and

selectively taking an action from the group consisting of

     1) opening a housing vent in said housing to permit a portion of said inflation gas to vent from said housing vent, and

     2) closing a housing vent in said housing to prevent said inflation gas from venting from said housing vent,

said action further including selectively plastically deforming a portion of said housing to form and open said housing vent and wherein said housing includes a deformation tab extending therefrom, and said action further includes providing means for directing a deforming force against said deformation tab, and selectively activating said means for directing a deforming force and said housing including first and second spaced, opposed side walls interconnected at an inner end by a bottom wall, each of said walls having longitudinal ends, and an end wall secured to each of said longitudinal ends, and said deformation tab is an extension of one of said end walls, and extends laterally outward from an adjacent one of said walls.

6. A method as in claim 5, wherein said means for directing a deforming force includes a pressure housing mounted to said adjacent one of said walls in proximity to said deformation tab, said pressure housing having a mouth opening onto said deformation tab, said pressure housing mounting an initiator such that activation of said initiator will increase pressure within said pressure housing and create a deforming force against said deformation tab, and wherein selectively activating said means for directing a deforming force comprises selectively activating said initiator.

7. In an airbag module having a housing with spaced opposed side walls and a bottom wall extending therebetween, said walls having longitudinal ends to which end walls are mounted, said walls defining an interior in which an inflator is mounted to produce inflation gas, the improvement comprising:

a housing vent extending through said housing, through which a portion of said inflation gas may vent;

a slide member mounted to said housing for movement between first and second positions, in said first position said slide member being either in covering relation to said housing vent or in spaced relation to said housing vent, and in said second position said slide member being in the other of said covering relation to said housing vent or said spaced relation to said housing vent, and;

an initiator mounted to said housing in a position such that selective activation of said initiator will cause said slide member to move from said first to said second position.

8. The improvement of claim 7, wherein said housing further includes a pair of slide rails extending in spaced opposed relation along one of said walls, and said slide member is a slide block mounted for movement between said slide rails.

9. The improvement of claim 8, wherein said side walls, bottom wall, and slide rails are extruded as a monolithic unit.

10. The improvement of claim 7, wherein a slide cup extends outward from one of said walls, and said slide member is a slide plug having a plug head which may be received in said housing vent when said slide plug is in covering relation to said housing vent, and having a guide flange received in said slide cup for guiding said slide plug during said movement from said first to said second position.

11. In an airbag module having a housing with spaced opposed side walls and a bottom wall extending therebetween, said walls having longitudinal ends to which end walls are mounted, said walls defining an interior in which an inflator is mounted to produce inflation gas, the improvement comprising:

an initiator mounted to said housing in a position such that selective activation of said initiator will cause a portion of said housing to plastically deform and form a housing vent through which a portion of said inflation gas may vent and said portion of said housing comprising a deformation tab extending from an edge of one of said walls.

12. The improvement of claim 11, further including a pressure housing mounted to an another of said walls adjacent to said deformation tab, said pressure housing including a mouth opening onto said deformation tab, and said initiator being operatively associated with said pressure housing such that said selective activation of said initiator will cause a pressure increase within said pressure housing which acts upon said deformation tab through said mouth.