Initiator for airbag inflation gas generation via dissociation

• US 6,117,254 A
• Filed: 02/20/1998
• Issued: 09/12/2000
• Est. Priority Date: 02/20/1998
• Status: Expired due to Term

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Richardson, William B., Green, David J., Rink, Karl K.
• Primary Examiner(s): Nelson, Peter A.
• Application Number:
  US09/027,020
• Time in Patent Office: 935 Days
• Field of Search: 149/35, 149/109.6, 102/288, 102/289
• US Class Current: 149/35
• CPC Class Codes: B60R 21/264 using instantaneous generation of gas, e.g. pyrotechnic B60R21/268 takes precedence
• CPC Class Codes: C06C 9/00 Chemical contact igniters; Chemical lighters
• CPC Class Codes: C06D 5/04 by auto-decomposition of single substances
• CPC Class Codes: C06D 5/10 by reaction of solids with liquids

Abstract

An apparatus and method for inflating a vehicular inflatable device are provided wherein inflation gas is produced via a dissociative material wherein an initiator includes an enhanced fuel pyrotechnic formulation which, in addition to initiating dissociation of at least a portion of a quantity of gas source material contained within the inflator, forming dissociation products used to inflate the device, also forms particles to interact with one or more of at least a portion of the remaining quantity of gas source material contained within the inflator and the dissociation products to form additional inflation products for inflating the inflatable device.

Claims

1. An initiator device for an inflator which contains a quantity of a gas source material and which inflator generates gas for inflating an inflatable device via dissociation of at least a portion of the quantity of gas source material, said initiator device comprising:

a zirconium hydride potassium perchlorate pyrotechnic formulation which, upon actuation of the initiator device, discharges to initiate dissociation of at least a portion of the quantity of gas source material contained within the inflator forming dissociation products used to inflate the device and to form particles to interact with one or more of at least a portion of the remaining quantity of gas source material contained within the inflator and dissociation products to form additional inflation products for inflating the inflatable device.

2. The initiator device of claim 1 wherein said particles comprise hot radiant metal particles.

3. The initiator device of claim 1 wherein said particles comprise fuel.

4. The initiator device of claim 1 wherein said pyrotechnic formulation comprises fuel in at least near stoichiometric amount relative to the oxidant content thereof.

5. In a method for inflating an inflatable safety device in a vehicle using an inflator which generates inflation gas via dissociation of a quantity of nitrous oxide gas source material stored within a chamber of the inflator, the step of:

actuating an initiator containing a zirconium hydride potassium perchlorate pyrotechnic formulation to produce sufficient heat to initiate dissociation of at least a portion of the quantity of nitrous oxide gas source material to form nitrous oxide dissociation products including at least one gaseous dissociation product used to inflate the device and to form particles to interact with one or more of at least a portion of the quantity of nitrous oxide and the nitrous oxide dissociation products to form additional gaseous products used to inflate the device.

6. The method of claim 5 wherein the particles comprise hot radiant metal particles.

7. The method of claim 5 wherein the particles comprise fuel.