Vertical seat locking retainer disk and tube combination

• US 6,068,294 A
• Filed: 05/26/1998
• Issued: 05/30/2000
• Est. Priority Date: 05/26/1998
• Status: Expired due to Fees

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Jordan, Michael P.
• Primary Examiner(s): Rice, Kenneth R.
• Application Number:
  US09/084,728
• Time in Patent Office: 735 Days
• Field of Search: 280/741
• US Class Current: 280/741
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder

Abstract

A positive lock for components of an air bag inflator assembly that includes a first member having a recess formed therein and comprising an ignition tube, a second member comprising a retainer disk, and a retaining means for locking the ignition tube to the retainer disk. The retainer disk has a hollow collar portion with a plurality of indented features formed in the distal end of the collar. At least a portion of the indented features are disposed in the recess in the ignition tube, thereby locking the retainer disk to the ignition tube. The indented features are configured such that upon a force parallel to the longitudinal axis of the ignition tube acting upon the retainer disk, the indented features deform so as to be at least partially disposed in the recess formed in the ignition tube. An inflator assembly for generating gas to rapidly inflate an air bag is also provided that includes a housing defining an interior space therein, an inner side wall with a recess formed therein, and a retainer disk The housing has a top wall, a lower portion, and an outer side wall. The inner side wall comprises an ignition tube that is connected to the lower portion of the housing and has ignition ports formed therein. Ignition tube defines an ignition chamber therein for containing an igniter and a combustion chamber between the inner side wall and the outer side wall for containing a gas generating material. A filter is disposed in the combustion chamber proximate to the interior surface of the outer side wall. The retainer disk is disposed over the inner side wall proximate to the top wall of the housing and has a collar portion that is configured to cooperate with the ignition tube. The collar has indented features formed therein that are at least partially disposed in the recess in the ignition tube, thereby positively locking said retainer disk to said ignition tube.

Claims

1. A method for mechanically locking components of an air bag system comprising the steps:

(a) positioning a second member having a hollow collar portion formed therein over an end of a first member, said collar being configured to cooperate with said end of said first member;

(b) exerting a force substantially parallel to the longitudinal axis of said first member upon said second member; and

(c) deforming an indented feature formed in said collar portion such that at least said indented feature is at least partially disposed in a recess formed in said first member, thereby positively locking said first member and said second member.

2. A method for mechanically locking components of an air bag system as recited in claim 1, further comprising the step rotating said indented feature.

3. A method for mechanically locking components of an air bag system as recited in claim 1, wherein said first member is an ignition tube.

4. A method for mechanically locking components of an air bag system as recited in claim 1, wherein said second member is a retainer disk.

5. A positive lock assembly for components of an air bag inflator assembly comprising:

(a) a first member having a longitudinal axis, an inside surface, and an outside surface;

(b) a second member having a hollow collar portion formed therein configured to cooperate with said first member;

(c) a retaining means for positively locking said first member to said second member;

(d) a recess formed in said inside surface of said first member; and

(e) a plurality of indented features formed in said collar portion of said second member, at least a portion of each of said plurality of indented features being disposed in said recess in said first member, thereby positively locking said second member to said first member.

6. A positive lock assembly as recited in claim 5, wherein said recess is defined by a step in the surface of said first member.

7. A positive lock assembly as recited in claim 5, wherein said recess is defined by a step formed in said ignition tube.

8. A positive lock assembly as recited in claim 5, wherein said recess is a channel.

9. A positive lock assembly as recited in claim 5, wherein said plurality of indented features are configured such that upon a force parallel to the longitudinal axis of said first member being applied to said retainer disk, said plurality of indented features deform so that at least a portion of each of said plurality of indented features is disposed in said recess formed in said first member.

10. A positive lock assembly as recited in claim 5, wherein each of said plurality of indented features are at an angle relative to the longitudinal axis of said first member such that the remote distal end of said collar portion at each of said plurality of indented features is proximate to said first member.

11. A positive lock assembly as recited in claim 5, wherein said collar portion is sized and configured to receive said first member therein.

12. A positive lock assembly as recited in claim 5, wherein said collar portion is sized and configured to be received within said first member.

13. A positive lock for components of an air bag inflator assembly comprising:

(a) an elongated ignition tube having an upper end;

(b) a retainer disk having a hollow collar portion formed therein, said collar portion having a distal end and being configured to receive said upper end of said ignition tube therein;

(c) a recess formed in said ignition tube; and

(d) an indented feature formed on said distal end of said collar, said indented feature being at least partially disposed in said recess upon a force parallel to the longitudinal axis of said ignition tube being applied to said retainer disk, thereby locking said retainer disk to said ignition tube.

14. A positive lock for components of an air bag inflator assembly as recited in claim 13, further comprising a plurality of indented features.

15. A positive lock for components of an air bag inflator assembly as recited in claim 14, wherein said plurality of indented features are at an angle relative to the longitudinal axis of said ignition tube such that the distal end of said collar portion at said plurality of indented features is proximate to said ignition tube.

16. A positive lock for components of an air bag inflator assembly as recited in claim 13, where in said recess is formed in the outside surface of said ignition tube.

17. A positive lock for components of an air bag inflator assembly as recited in claim 13, wherein said recess is a channel.

18. An inflator assembly for generating gas to rapidly inflate an air bag, comprising:

(a) a quantity of gas generating material;

(b) a housing comprising a top wall, a lower portion, and an outer side wall, defining an interior space therebetween, said outer side wall having a plurality of diffusion ports formed therein;

(c) an inner side wall connected to said lower portion of said housing, said inner side wall being substantially concentric with said outer side wall, said inner side wall defining an ignition chamber therein for containing an igniter and a combustion chamber between said inner side wall and said outer side wall for containing said quantity of gas generating material, said inner side wall having a plurality of ignition ports formed therein;

(d) a filter disposed in said combustion chamber proximate to the interior surface of said outer side wall, said filter being configured to entrap combustion residue from said gas generated in said housing before discharge of said gas;

(e) a retainer disk disposed over said inner side wall proximate to said top wall of said housing, said retainer disk having a hollow collar portion formed therein configured to cooperate with said ignition tube; and

(f) retaining means for positively locking said retainer disk to said inner side wall.

19. An inflator assembly as recited in claim 18, wherein said inner side wall comprises an ignition tube.

20. An inflator assembly as recited in claim 19, wherein said retaining means comprises:

(a) a recess formed in said ignition tube; and

(b) a plurality of indented features formed in said collar portion, at least a portion of each of said plurality of indented features being disposed in said recess in said ignition tube, thereby locking said retainer disk to said ignition tube.

21. An inflator assembly as recited in claim 20, wherein said plurality of indented features being configured such that upon a force parallel to the longitudinal axis of said ignition tube being applied to said retainer disk, each of said plurality of indented features deforming so as to be at least partially disposed in said recess formed in said ignition tube.

22. An inflator assembly as recited in claim 19, wherein:

(a) said collar portion has a distal end; and

(b) each of said plurality of indented features being at an angle relative to the longitudinal axis of said ignition tube such that said distal end of said collar portion at each of said plurality of indented features is proximate to said ignition tube.

23. An inflator assembly, as recited in claim 20, wherein said recess is formed in the outside surface of said ignition tube.

24. An inflator assembly as recited in claim 22, wherein said recess is a channel.

25. A housing as recited in claim 24, wherein:

(a) said filter has an outer surface adjacent an inside surface of said outer side wall, an upper lateral surface, and a lower later surface; and

(b) said retainer disk being disposed proximate to at least a portion of said upper lateral surface of said filter and against said top wall for preventing blow by of generated gas around said filter.

26. A positive lock assembly for components of an air bag inflator assembly comprising:

(a) an ignition tube having a longitudinal axis, an inside surface, and an outside surface;

(b) a retainer disk having a hollow collar portion formed therein configured to cooperate with said ignition tube;

(c) a recess formed in said inside surface of said ignition tube; and

(d) a plurality of indented features formed in said collar portion of said retainer disk, at least a portion of each of said plurality of indented features being disposed in said recess in said ignition tube, thereby positively locking said retainer disk to said ignition tube.

27. A housing for an air bag inflator assembly, comprising:

(a) a cover having a top wall and a downwardly extending outer side wall, said outer side wall having a plurality of diffuser ports formed therein;

(b) a base configured to cooperate with said cover to define an enclosed interior space therebetween;

(c) an inner side wall attached to said base, said inner side wall and said outer side wall defining a combustion chamber, said inner side wall defining an ignition chamber and having a plurality of ignition ports therein, said inner side wall having an open end, a lower end, and a recess formed therein;

(d) a filter disposed in said combustion chamber adjacent to the inner surface of said outer side wall; and

(e) a retainer disk disposed over said inner side wall proximate to said top wall, said retainer disk having a hollow collar portion formed therein configured to cooperate with said inner side wall, said collar portion having a plurality of indented features formed therein configured to cooperate with said upper end of said inner side wall to positively lock said retainer disk and said inner side wall.