Inflator

• US 7,954,848 B2
• Filed: 03/23/2010
• Issued: 06/07/2011
• Est. Priority Date: 03/24/2009
• Status: Expired due to Fees

• Current Assignee: Nipponkayaku Kabushikikaisha, Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Original Assignee: Nipponkayaku Kabushikikaisha, Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Inventors: Hasegawa, Shinya, Masuda, Yasushi, Mukunoki, Hirotaka, Ochi, Hiroyuki, Hayakawa, Shinichi, Ozaki, Toru
• Primary Examiner(s): Fleming; Faye M.
• Application Number:
  US12/659,851
• Publication Number:
  US 20100253053A1
• Time in Patent Office: 441 Days
• Field of Search: 280/736, 280/740, 280/741
• US Class Current: 280/736
• CPC Class Codes: B60R 2021/2648 comprising a plurality of combustion chambers or sub-chambers
• CPC Class Codes: B60R 21/2646 the reacting substances being supported by the inflatable member walls, or by a flexible support within it

Abstract

An inflator includes in a combustion chamber a first gas generating charge and a second gas generating charge to be ignited and burned to generate an inflation gas. The second gas generating charge is slower in speed of combustion than the first gas generating charge. The inflator further includes a partition wall that segregates the first and second gas generating charges. The partition wall is located away from an ignition area of an ignition device that ignites the first gas generating charge, with the first gas generating charge located between itself and the ignition area. The partition wall is burnable to destruction by the fire generated by combustion of the first gas generating charge so as to permit propagation of the fire to the second gas generating charge by its generally entire area.

Claims

1. An inflator comprising:

a combustion chamber;

an ignition device located inside the combustion chamber;

a first gas generating charge filled in the combustion chamber for combustion, by ignition of the ignition device, to generate an inflation gas;

a second gas generating charge filled in the combustion chamber at a location away from an ignition area of the ignition device, with the first gas generating charge interposed between itself and the ignition area, the second gas generating charge being slower in speed of combustion than the first gas generating charge and ignitable by a flame generated by combustion of the first gas generating charge; and

a partition wall that segregates the first gas generating charge and second gas generating charge inside the combustion chamber so as to prevent the first and second charges from mixing, the partition wall being burnable to destruction by a fire built by combustion of the first gas generating charge so as to allow the fire to propagate to the second gas generating charge over a generally entire area that the partition wall bounds the first and second gas generating charges.

2. The inflator according to claim 1, wherein:

at least one of the first gas generating charge and second gas generating charge is wrapped by a burnable covering material in the combustion chamber; and

the partition wall is comprised of an area of the covering material that bounds the first gas generating charge and the second gas generating charge.