AIR BAG DEVICE

• US 20110049850A1
• Filed: 07/23/2008
• Published: 03/03/2011
• Est. Priority Date: 08/10/2007
• Status: Active Grant

• Current Assignee: Autoliv Development AB (Autoliv Incorporated)
• Original Assignee: Autoliv Development AB (Autoliv Incorporated)
• Inventors: Horikawa, Jun, Haga, Takashi
• Granted Patent: US 8,596,679 B2
• Time in Patent Office: Days
• US Class Current: 280/736
• CPC Class Codes: B60R 2021/161 characterised by additional means for controlling deployment trajectory
• CPC Class Codes: B60R 21/201 Packaging straps or envelopes for inflatable members
• 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

Abstract

To prevent positional deviation in a folded back portion of a deployment restriction sheet reliably, an air bag device includes an air bag 1, an inflator 7 for deploying the air bag 1 by supplying the air bag with a generated gas, an air bag case 3 used to attach the inflator 7 and store the air bag 1, a retainer 6 for fixing an opening portion peripheral edge of the air bag 1 to the air bag case 3, and a deployment restriction sheet 11 that covers the air bag 1 from a vehicle body rear side to a vehicle body front side when the air bag 1 is stored. In the deployment restriction sheet 11, a folded back portion 11c is subjected to tacking 11d so as to separate upon application of a predetermined load A, and a rupturable portion 11e that ruptures upon application of a predetermined load B, which is larger than the load A, is provided on a first end 11a side positioned on the vehicle body front side. The first end 11a is attached to an air bag main body. A second end 11b is installed on the air bag main body. As a result, positional deviation of the folded back portion does not occur, and a cushioning effect can be applied to an occupant effectively.

Claims

1. An air bag device comprising:

an air bag having a folded configuration in a pre-deployment state;

an inflator that supplies said air bag with a generated gas;

an air bag case attached to said inflator, wherein said air bag is substantially disposed within said air bag case;

a retainer fixing an opening portion of a peripheral edge of said air bag to said air bag case; and

a deployment restriction sheet that covers said air bag from a rear side of a vehicle body to a front side of a vehicle body when said air bag is stored in said air bag case,

wherein said deployment restriction sheet comprises a folded portion disposed at a central portion, said folded portion being releasably joined so as to separate upon application of a first predetermined load, and a rupturable portion that ruptures upon application of a second predetermined load, said second load being greater than said first load, wherein said rupturable portion is disposed on a first end side of said deployment restriction sheet, said first end side being positioned on said front side of said vehicle body, and

wherein said first end of said deployment restriction sheet is attached to a main body of said air bag at said front side of said vehicle, and second end of said deployment restriction sheet is attached to said main body of said airbag at said rear side of said vehicle.

2. The air bag device according to claim 1, wherein said air bag stantially disposed in said air bag case is enclosed in a box-shaped cloth case having an open upper surface, and

said first end of said deployment restriction sheet is attached to said cloth case and said second end of said deployment restriction sheet is fixed to said cloth case.

3. The air bag device according to claim 1, wherein said first end of said deployment restriction sheet is further attached to said air bag case.

5. The air bag device according to claim 1, wherein said deployment restriction sheet is wider than said folded air bag.

4. An air bag device comprising:

an air bag having a folded configuration in a pre-deployment state;

an inflator that supplies said air bag with a generated gas;

an air bag case attached to said cloth case and said inflator;

a retainer fixing an opening portion of a peripheral edge of said air bag to said cloth case; and

a deployment restriction sheet that covers said air bag from a rear side of said vehicle body to a front side of said vehicle body when said air bag is substantially disposed in said cloth case in said folded configuration,

wherein said cloth case is formed in a box shape such that at least an upper surface of said folded air bag oriented toward a lid of the airbag device is exposed,

wherein said deployment restriction sheet is formed by extending at least one side face of said cloth case and folding a resulting extension portion to form a

folded portion disposed at a central portion of said extension portion, said folded portion being releasably joined so as to separate upon application of a first predetermined load,

said extension portion comprising a rupturable portion that ruptures upon application of a second predetermined load, said second predetermined load being greater than said first predetermined load, said rupturable portion being disposed on a tip end side of said extension portion, said tip end portion being disposed on said front side of said which vehicle body.

6. The air bag device according to claim 4, wherein said deployment restriction sheet is wider than said folded air bag.