Generant preload and tolerance takeup assembly for vehicular airbag installation

• US 5,387,008 A
• Filed: 03/14/1994
• Issued: 02/07/1995
• Est. Priority Date: 03/14/1994
• Status: Expired due to Fees

• Current Assignee: Morton International Incorporated (Autoliv Incorporated)
• Original Assignee: Morton International Incorporated (Autoliv Incorporated)
• Inventors: Lauritzen, Donald R., Ralston, Joseph L.
• Primary Examiner(s): Camby, Richard M.
• Assistant Examiner(s): Ellis, Christopher P.
• Application Number:
  US03/512,258
• Time in Patent Office: 330 Days
• Field of Search: 280/728 R, 280/741, 280/732, 280/736, 280/728 A, 102/530, 102/531, 102/380
• US Class Current: 280/741
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder

Abstract

An all-metal preload for the gas generant charge of a passenger-side vehicular airbag assembly includes a base member which lodges firmly in one end of the cylindrical filter. A contact member engages the end of the generant charge. Spring means are interposed between the base member and the contact member for maintaining a compressive force against the generant charge.

Claims

1. In a gas generating assembly for a vehicular airbag system including a substantially hollow, cylindrical filter having a longitudinal central axis and first and second ends, a substantially cylindrical gas generant having first and second ends and retained within said filter substantially coaxial therewith, and a preload seated against the first end of said gas generant to apply a compressive force thereagainst, the improvement wherein said preload comprises:

a metallic cup-shaped body having a sidewall seated securely within the first end of said filter and substantially coaxial therewith and a substantially circular base bounded by said sidewall;

a metallic contact member engaging the first end of said gas generant; and

metallic spring means intermediate said base and contact member for maintaining an axial compressive force against the first end of said gas generant.

2. The improvement of claim 1 wherein said contact member comprises a disc.

3. The improvement of claim 2 wherein said spring means comprises a finger spring washer.

4. The improvement of claim 2 wherein said preload additionally comprises means for maintaining said body, contact member, and spring means as a unitary assembly.

5. The improvement of claim 4 wherein said contact member comprises an annular disc defining an axial opening therethrough and said maintaining means comprises an axially slidable hub interconnecting said axial opening and the base of said cup-shaped body.

6. The improvement of claim 5 wherein said hub is a substantially cylindrical axial extension of the base of said cup member and is captured within the axial opening of the annular disc.

7. The improvement of claim 5 wherein the base of said cup-shaped body defines an axial opening therethrough and said hub comprises:

a pin having a first end extending through the axial opening in the base of the cup-shaped body and a second end extending through the axial opening of the annular disc;

an enlarged head on the first end of said pin to capture it within said base; and

an enlarged head on the second end of said pin to capture it within said annular disc.

8. The improvement of claim 1 wherein said contact member comprises a raised central portion of the base of said cup-shaped body and said spring means comprises portions of said base.

9. The improvement of claim 8 wherein said base defines openings spaced circumferentially thereabout relative to said longitudinal central axis and said spring means comprise the base portions intermediate said radially spaced openings.

10. The improvement of claim 1 wherein said contact member and said spring means are unitary.

11. The improvement of claim 10 wherein said unitary contact member and spring means additionally comprise at least one retaining tine engageable with said cup-shaped body.

12. A preload for the gas generant of an automotive airbag installation, which generant has first and second ends and is housed within a cylindrical filter having first and second ends, which comprises:

a metallic cup-shaped body having a sidewall seatable securely within the first end of said filter, substantially coaxial therewith, and a substantially circular base bounded by said sidewall;

a metallic contact member engageable with the first end of said generant; and

metallic spring means intermediate said base and contact member for maintaining an axial compressive force against the first end of said gas generant.

13. The preload of claim 12 wherein said cup-shaped body, contact member, and spring means are interconnected.

14. The preload of claim 13 wherein said body member includes an axial hub and said contact member and spring means are annular and slidably supported on said hub.

15. The preload of claim 13 wherein each of said body, contact member, and spring means is annular and they are interconnected by a rivet-like member extending through their central openings.

16. The preload of claim 13 wherein said contact member comprises a raised central portion of the base of said cup-shaped body and said spring means comprises portions of said base.

17. The preload of claim 16 wherein said base defines openings spaced radially thereabout relative to said longitudinal central axis and said spring means comprises the base portions intermediate said radially spaced openings.

18. The preload of claim 12 wherein said contact member and said spring means are unitary.

19. The preload of claim 18 wherein said spring means are leaf springs formed in said contact member and wherein said contact member additionally includes retaining tines engageable with said cup-shaped body.