Head protecting air bag device

• US 20020105174A1
• Filed: 01/30/2002
• Published: 08/08/2002
• Est. Priority Date: 02/05/2001
• Status: Active Grant

• Current Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Original Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Inventors: Ogata, Kenji, Takahashi, Hiroyuki, Tanase, Toshinori, Ogata, Tetsuya
• Granted Patent: US 6,749,216 B2
• Time in Patent Office: Days
• US Class Current: 280/730.2
• CPC Class Codes: B60R 2021/2612 Gas guiding means, e.g. ducts
• CPC Class Codes: B60R 2021/2617 Curtain bag nozzles
• CPC Class Codes: B60R 21/232 Curtain-type airbags deploying mainly in a vertical direction from their top edge
• CPC Class Codes: B60R 21/26 characterised by the inflation fluid source or means to control inflation fluid flow arrangement or mounting thereof to the vehicle B60R21/20; blasting cartridges for producing gas under pressure in general F42B3/04; initiators or igniters therefor F42B3/10

Abstract

To reduce damaging of an inner tube in the vicinity of a gas ejection port of an inflator. To the peripheral portion near an end on a gas ejection port side of an inflator, one end of a pipe is fixed. The pipe extends in the axial direction of an inner tube having such flexibility as a cloth, is smaller in the diameter, shorter and higher in rigidity than the inner tube. In the pipe, its leading end is thinner than a part that is an outer portion of the gas ejection port of the inflator. Further, at the peripheral portion of the end of the pipe, a rear-leading end of the inner tube is clumped-by a clump.

Claims

1. A head protecting air bag device comprising:

a bag body forming at least one expansion room and a gas passage extending in the longitudinal direction of a vehicle body communicating to the expansion room;

an inflator which ejects expansion gas in the bag body;

a flexible inner tube provided in the gas passage and for supplying the expansion gas into the expansion room; and

a pipe coupled to a gas ejection port of the inflator and extending in an axial direction of the inner tube, a leading end of the pipe protruding into the inner tube.

2. The head protecting air bag device according to claim 1, wherein a deflecting portion are provided at the leading end of the pipe, the deflecting portion deflects an ejecting direction of the expansion gas to a direction to an opposite side of a sewed portion provided on the inner tube.

3. The head protecting air bag device according to claim 2, wherein the deflecting portion is formed as a leading end of the pipe cut slantingly.

4. The head protecting air bag device according to claim 1, wherein an axis of the inflator at the mounting position of the pipe and an axis of the leading end of the pipe are offset with each other in vertical direction, and a bending portion is formed at a part of the pipe near the gas ejection port of the inflator.

5. The head protecting air bag device according to claim 1, wherein an inner diameter of the pipe is smaller than an outer diameter of the ejection part of the inflator, and a length of the pipe is smaller than a length with which the pipe extends over a gas outlet hole for supplying the expansion gas to the expansion room.

6. A head protecting air bag device comprising:

a bag body forming at least one expansion room and a gas passage extending in the longitudinal direction of a vehicle body communicating to the expansion room;

an inflator which ejects expansion gas in the bag body;

a flexible inner tube provided in the gas passage and for supplying the expansion gas into the expansion room; and

a high-voltage resistant flexible tube having a small length and a small diameter is provided, which protrudes axially from the inflator into the inner tube.

7. The head protecting air bag device according to claim 6, wherein an inner diameter of the high-voltage resistant flexible tube is smaller than an outer diameter of the ejection part of the inflator, and a length of the high-voltage resistant flexible tube is smaller than a length with which the high-voltage resistant flexible tube extends over a gas outlet hole for supplying the expansion gas to the expansion room.

8. A head protecting air bag device comprising:

a bag body forming at least one expansion room and a gas passage extending in the longitudinal direction of a vehicle body communicating to the expansion room;

an inflator which ejects expansion gas in the bag body;

a flexible inner tube provided in the gas passage and for supplying the expansion gas into the expansion room; and

a high-voltage resistant flexible tube protruding axially from the inflator into the gas passage in the bag body;

wherein the inner tube is covered with the high-voltage resistant flexible tube so that the inner tube is narrowed.

9. The head protecting air bag device according to claim 8, wherein an inner diameter of the high-voltage resistant flexible tube is smaller than an outer diameter of the ejection part of the inflator, and a length of the high-voltage resistant flexible tube is smaller than a length with which the high-voltage resistant flexible tube extends over a gas outlet hole for supplying the expansion gas to the expansion room.