Airbag device

• US 20060175809A1
• Filed: 01/29/2004
• Published: 08/10/2006
• Est. Priority Date: 01/31/2003
• Status: Active Grant

• Current Assignee: Ashimori Industry Company Limited
• Original Assignee: Ashimori Industry Company Limited
• Inventors: Yamaji, Naoki, Azuma, Hidetake
• Granted Patent: US 7,637,530 B2
• Time in Patent Office: Days
• US Class Current: 280/729
• CPC Class Codes: B60R 2021/23316 Inner seams, e.g. creating separate compartments or used as tethering means
• CPC Class Codes: B60R 2021/23324 Inner walls crating separate compartments, e.g. communicating with vents
• CPC Class Codes: B60R 21/23138 specially adapted for side protection B60R21/23184, B60R21/232 take precedence
• CPC Class Codes: B60R 21/239 characterised by their venting means

Abstract

In an air bag device 1 against a side collision which can be expanded and spread out in a gap between an outside portion of a seat of a vehicle and a wall opposite thereto owing to gas generated by an inflator 20 in emergency situations so as to obtain the air bag device at a low cost which system is provided with plural air chambers having difference in expansion timing and pressure depending on portions of a body of a crew, an air bag 10 is structured by a lower air chamber 12 provided with the inflator and an upper air chamber 14, a partition unit 40 for partitioning the lower air chamber 12 and the upper air chamber 14 is structured by a cloth sewn to the air bag, and a communication hole 40b which introduces gas from the inflator 20 from the lower air chamber 14 into the upper air chamber and is closed when subjected to pressure of the upper chamber as the pressure of the lower air chamber is reduced is formed in the cloth.

Claims

1. An air bag device provided with an air bag-like body comprising a first air chamber, a second air chamber, and a diffuser interposed between the first and second air chambers and having first and second communication holes for portioning out gas from an inflator to the first and second air chambers, respectively, wherein when pressure inside the diffuser becomes lower than pressure inside the first air chamber or pressure in the second air chamber, at least one of the first and second communication holes is closed owing to a difference in pressure therebetween.

2. An air bag device according to claim 1, the diffuser is provided with the partition unit formed of cloths between itself and at lest one of the first and second air chambers, and the partition unit introduces flow of gas from the inflator into the first or second air chamber, and has the communication holes which are closed by the cloths forming the partition unit owing to a difference in pressure between itself and the first or second air chamber when the pressure inside the diffuser is lowered.

6. An air bag device according to claim 2, wherein a volume of the first air chamber is smaller than that of the second air chamber.

7. An air bag device according to claim 2, wherein an exhaust port is provided in the first air chamber.

8. An air bag device according to claim 2, wherein the cloths on the top face side and the rear face side forming the air bag are sewn to one another so as to form guide paths in such a way that stream of gas flown in the second air chamber is guided from a rear side of a vehicle of the air bag into an upper portion of the air bag, and further from the upper portion to a front portion thereof.

3. An air bag device having an inflator for generating gas in emergency situations so as to be expanded and spread out by generated gas, wherein an air bag comprises cloths which have been sewn to the top face side, and rear face side thereof, further comprises a first air chamber provided with the inflator, a second air chamber, and the cloths interposed between the first and second air chambers and folded toward the second air chamber, and a partition unit sewn to base cloths on the top face side and rear face side thereof at side portions other than the folded side portion of the bath cloths, and wherein the partition unit is provided with a communication hole which is closed by the cloths forming the partition unit owing to a difference in pressure between the diffuser and the second air chamber.

4. An air bag device according to claim 3, wherein the diffuser for rectifying flow of the gas from the inflator in the direction of the partition unit is provided in the first air chamber, and the diffuser supplies gas to the second air chamber more than it supplies gas to the first air chamber.

5. An air bag device according to claim 3, the partition unit is continuously and integrally formed with the diffuser, and a second communication hole which is smaller than that of the partition unit for supplying gas to the first air chamber is provided in the diffuser.