Ignition granule retention disc

• US 5,427,030 A
• Filed: 10/12/1993
• Issued: 06/27/1995
• Est. Priority Date: 10/12/1993
• Status: Expired due to Fees

• Current Assignee: Morton International Incorporated (Autoliv Incorporated)
• Original Assignee: Morton International Incorporated (Autoliv Incorporated)
• Inventors: Lindsey, David W., Kidd, Paul D.
• Primary Examiner(s): TUDOR, HAROLD JAY
• Application Number:
  US08/134,960
• Time in Patent Office: 623 Days
• Field of Search: 102/202, 102/380, 102/530, 102/531, 280/736, 280/741, 422/164-166
• US Class Current: 102/202
• CPC Class Codes: B60R 2021/26064 characterised by auto-ignition means
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder
• CPC Class Codes: F42B 3/04 for producing gas under pressure generators of inflation fluid especially adapted for vehicle air bags B60R21/26
• CPC Class Codes: F42C 19/0826 comprising an elongated perforated tube, i.e. flame tube, for the transmission of the initial energy to the propellant charge, e.g. used for artillery shells and kinetic energy penetrators

Abstract

An igniter tube for a gas-generating device comprising an elongate cylinder, a primary igniter powder within the cylinder, a closure at one end of the cylinder, and an auto ignition cup disposed at the end of the cylinder opposite the closure is improved by the use of a resin-blocked screen as the closure between the igniter powder and the auto ignition cup.

Claims

1. In an igniter tube for an air bag inflator, said tube comprising an elongate cylinder, primary igniter powder within said cylinder, a closure at one end of the cylinder, and an auto ignition cup disposed at the end of the cylinder opposite said closure, the improvement comprising a rupturable composite disc of a resin-blocked screen held against said opposite end of the cylinder between the igniter powder and the auto ignition cup, said resin being from about 2 to about 10 mils thick and said screen has a mesh size of from about 50 to about 325.

2. The improved tube of claim 1 wherein the resin of the resin-blocked screen is no thicker than about 6 mils.

3. The improved tube of claim 1 wherein the resin of the resin-blocked screen is a polyester film adhered to the screen.

4. The improved tube of claim 1 wherein the resin of the resin-blocked screen is polyurethane.

5. The improved tube of claim 4 wherein the screen is impregnated with polyurethane.