Airbag system

• US 20040160040A1
• Filed: 09/29/2003
• Published: 08/19/2004
• Est. Priority Date: 02/17/2003
• Status: Active Grant

• Current Assignee: Takata Corporation (Ningbo Junsheng Investment Group Co., Ltd.)
• Original Assignee: Takata Corporation (Ningbo Junsheng Investment Group Co., Ltd.)
• Inventors: Takedomi, Akifumi, Kurimoto, Takeshi
• Granted Patent: US 6,802,529 B2
• Time in Patent Office: Days
• US Class Current: 280/729
• CPC Class Codes: B60R 2021/23332 using independent bags, one within the other
• CPC Class Codes: B60R 2021/26094 characterised by fluid flow controlling valves
• CPC Class Codes: B60R 21/217 Inflation fluid source retainers, e.g. reaction canisters; Connection of bags, covers, diffusers or inflation fluid sources therewith or together
• CPC Class Codes: B60R 21/23138 specially adapted for side protection B60R21/23184, B60R21/232 take precedence
• CPC Class Codes: B60R 21/2342 Tear seams

Abstract

An airbag system includes an airbag, and a gas generator for generating gas to inflate the airbag. The airbag further includes an inner bag to be inflated first and disposed inside the airbag, and a check valve for preventing the gas from flowing from the inner bag to the airbag. In the airbag system, after the inner bag is inflated, the gas is supplied to the airbag to inflate the same.

Claims

1. An airbag system for protecting an occupant, comprising:

an airbag,

an inner bag disposed inside the airbag,

a gas generator for generating gas to inflate the airbag and the inner bag,

means for first providing the gas to the inner bag connected to the gas generator, said providing means providing the gas between the airbag and the inner bag to inflate the airbag after the inner bag is inflated, and

a check valve attached to the inner bag for preventing the gas from flowing out of the inner bag into the airbag when the inner bag is inflated.

2. An airbag system according to claim 1, wherein said providing means is a connection device for connecting the inner bag to the gas generator, said connection device disconnecting the inner bag from the gas generator when a gas pressure in the inner bag exceeds a predetermined value so that the gas generator supplies the gas only to the airbag.

3. An airbag system according to claim 2, wherein said connection device is attached to the gas generator so that said connection device is detached from the gas generator when the gas pressure in the inner bag exceeds the predetermined value.

4. An airbag system according to claim 2, wherein said connection device is an extend portion of the inner bag having a tear seam, said extended portion separating from the inner bag when the inner pressure in the inner bag exceeds the predetermined value to break the tear seam.

5. An airbag system according to claim 1, wherein said inner bag is disposed at a lower portion of the airbag.

6. An airbag system according to claim 2, wherein said connection device is an elastic member for pressing the inner bag against the gas generator.