Air bag device

• US 20020070536A1
• Filed: 12/04/2001
• Published: 06/13/2002
• Est. Priority Date: 12/11/2000
• Status: Active Grant

• Current Assignee: Joyson Safety Systems Japan K.K.
• Original Assignee: Takata Corporation (Ningbo Junsheng Investment Group Co., Ltd.)
• Inventors: Okamoto, Hideaki
• Granted Patent: US 6,709,006 B2
• Time in Patent Office: Days
• US Class Current: 280/728.2
• CPC Class Codes: B60R 21/2171 specially adapted for elongated cylindrical or bottle-like inflators with a symmetry axis perpendicular to the main direction of bag deployment, e.g. extruded reaction canisters B60R21/2176 takes precedence

Abstract

An air bag device providing for reduced effects of heat on a bag. A bag and an inflator of an air bag device are affixed in a retainer by a bag plate. The bag plate includes a semi-circular arch portion and flanges formed at the sides of the arch portion. The arch portion of the bag plate is provided with circular openings and beads projecting toward the inside, the beads being disposed at the outer sides of the circular openings, respectively. When assembled, the beads are in line contact with a cylindrical outer face of the inflator. By virtue of the beads, the area of direct contact between the bag plate and the cylindrical outer face of the inflator is reduced and a gap is formed therebetween. As a result, heat generated when the inflator operates is not likely to be transmitted to the bag plate.

Claims

1. An air bag device comprising:

an inflatable bag;

an inflator for supplying gas to expand the bag;

a retainer for retaining the bag and the inflator;

a plate for fixing the inflator to the retainer and the bag to the retainer at a holding portion of the bag; and

wherein the plate includes a mechanism disposed between the plate and the inflator for suppressing the transmission of heat from the inflator to the plate.

2. The air bag device of claim 1, wherein the inflator is in a cylindrical form and the plate includes an inner face along the cylindrical outer face of the inflator;

and wherein the mechanism comprises a bead formed on the inner face of the plate and positioned to be in contact with the cylindrical outer face of the inflator.

3. The air bag device of claim 2, wherein the retainer includes an inner face along the cylindrical outer face of the inflator, and a bead formed on said inner face of the retainer, wherein the bead is in contact with the cylindrical outer face of the inflator.

4. The air bag device of claims 1, wherein the mechanism is configured to provide a predetermined gap between a gas outlet of the inflator and the bag plate.

5. The air bag device of claim 1, wherein the plate comprises a section for affixing an open end of the bag to the retainer.

6. An airbag device comprising:

an inflatable airbag having an open end;

an inflator for supplying gas into the open end of the bag;

a retainer for holding the inflator;

a plate connected to the retainer wherein the inflator is positioned between the plate and the retainer and the open end of the bag is fixed between the retainer and the plate;

wherein the plate includes a portion projecting toward the inflator to reduce the conduction of heat from the inflator to the plate.

7. An air bag device having an inflator positioned between a retainer and a plate, wherein an open end of an inflatable airbag is secured between the retainer and the plate, and wherein contact between the plate and the inflator is limited to contact between a projecting portion of the plate and the inflator.