Air bag in use for head protection air bag device

• US 20020020991A1
• Filed: 07/27/2001
• Published: 02/21/2002
• Est. Priority Date: 07/31/2000
• Status: Active Grant

• Current Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Tanase, Toshinori, Ohno, Mitsuyoshi, Urushi, Norio, Tanabe, Choko
• Granted Patent: US 6,616,179 B2
• Time in Patent Office: Days
• US Class Current: 280/730.2
• CPC Class Codes: B60R 2021/23316 Inner seams, e.g. creating separate compartments or used as tethering means
• CPC Class Codes: B60R 21/232 Curtain-type airbags deploying mainly in a vertical direction from their top edge

Abstract

An air bag is stored in the upper fringe of the openings on the cabin-inside side, while being folded. The air bag includes a gas inflow part for flowing inflation gas into the air bag, and a main body which inflates when receiving the inflation gas. The main body includes front- and rear-seat inflation chambers, and a gas passage extending forward from the gas inflow part and allowing the inflation gas to flow from inflow ports opened in the upper parts of the front-and rear-seat inflation chambers to the front- and rear-seat inflation chambers per se. The inflow port of the rear-seat inflation chamber is opened in a direction substantially orthogonal to an axial direction of the gas passage. A front-side peripheral edge is disposed to be higher than a rear-side peripheral edge.

Claims

1. An air bag in use for a head protection air bag device in which said air bag, while being folded, is stored in an upper fringe of openings on a cabin-inside side of a vehicle, said air bag comprising:

a gas inflow part for flowing inflation gas;

a gas passage extending forward from said gas inflow part;

a front-seat inflation chamber located at a position near a side of a front seat for receiving the inflation gas; and

a rear-seat inflation chamber located at a position near a sides of a rear seat for receiving the inflation gas, said front- and rear-seat inflation chambers being disposed below said gas passage through respective inflow ports formed in upper parts of said front- and rear-seat inflation chambers to allow the inflation gas to flow into said front- and rear-seat inflation chambers;

wherein said inflow port of said rear-seat inflation chamber is opened in a direction substantially orthogonal to an axial direction of said gas passage, and its front-side peripheral edge is disposed to be higher than its rear-side peripheral edge.

2. An air bag in use for a head protection air bag device according to claim 1, wherein said front-side peripheral edge is higher than said rear-side peripheral edge by a dimension of 20 mm.

3. An air bag in use for a head protection air bag device according to claim 1, wherein a height dimension of said front-side peripheral edge from said rear-side peripheral edge is in a range of 15 to 40% of a height dimension of said gas passage.

4. An air bag in use for a head protection air bag device according to claim 1, further comprising a partitioning part parting said gas passage from said rear-seat inflation chamber to thereby define said inflow port of said rear-seat inflation chamber, said partitioning part comprising a beginning part and a linear part linearly slanting downward from said beginning part in a frontward direction and said rear-side peripheral edge of said inflow port of said rear-seat inflation chamber is positioned at a fore end of said linear part.

5. An air bag in use for a head protection air bag device according to claim 1, further comprising a partitioning part parting said gas passage from said rear-seat inflation chamber to thereby define said inflow port of said rear-seat inflation chamber, said partitioning part comprising a beginning part and a linear part linearly slanting downward from said beginning part in a rearward direction and said front-side peripheral edge of said inflow port of said rear-seat inflation chamber is positioned at a fore end of said linear part.

6. An air bag in use for a head protection air bag device according to claim 1, further comprising a guide formed on an upper peripheral wall of said gas passage located above an inflow port of said front-seat inflation chamber such that the upper peripheral part is gently projected downward in a frontward direction.

7. An air bag in use for a head protection air bag device according to claim 6, wherein a projection quantity between a lower end of said guide and said upper peripheral wall of said gas passage is set at 30 mm.

8. An air bag in use for a head protection air bag device according to claim 6, wherein a projection quantity between a lower end of said guide and said upper peripheral wall of said gas passage is in a range of 20 to 50% of a height dimension of said gas passage.

9. An air bag in use for a head protection air bag device in which said air bag, while being folded, is stored in an upper fringe of openings on a cabin-inside side of a vehicle, said air bag comprising:

a gas inflow part for flowing inflation gas;

a gas passage extending forward from said gas inflow part;

a front-seat inflation chamber located at a position near a side of a front seat for receiving the inflation gas; and

a rear-seat inflation chamber located at a position near a sides of a rear seat for receiving the inflation gas, said front- and rear-seat inflation chambers being disposed below said gas passage through respective inflow ports formed in upper parts of said front- and rear-seat inflation chambers to allow the inflation gas to flow into said front- and rear-seat inflation chambers; and

a guide formed on an upper peripheral wall of said gas passage located above an inflow port of said front-seat inflation chamber such that the upper peripheral part is gently projected downward in a frontward direction.

10. An air bag in use for a head protection air bag device according to claim 9, wherein a projection quantity between a lower end of said guide and said upper peripheral wall of said gas passage is set at 30 mm.

11. An air bag in use for a head protection air bag device according to claim 9, wherein a projection quantity between a lower end of said guide and said upper peripheral wall of said gas passage is in a range of 20 to 50% of a height dimension of said gas passage.

12. An air bag in use for a head protection air bag device according to claim 9, wherein said inflow port of said rear-seat inflation chamber is opened in a direction substantially orthogonal to an axial direction of said gas passage, and its front-side peripheral edge is disposed to be higher than its rear-side peripheral edge.

13. An air bag in use for a head protection air bag device according to claim 12, wherein said front-side peripheral edge of said rear-seat inflation chamber is higher than said rear-side peripheral edge by a dimension of 20 mm.

14. An air bag in use for a head protection air bag device according to claim 12, wherein a height dimension of said front-side peripheral edge from said rear-side peripheral edge is in a range of 15 to 40% of a height dimension of said gas passage.

15. An air bag in use for a head protection air bag device according to claim 12, further comprising a partitioning part parting said gas passage from said rear-seat inflation chamber to thereby define said inflow port of said rear-seat inflation chamber, said partitioning part comprising a beginning part and a linear part linearly slanting downward from said beginning part in a frontward direction and said rear-side peripheral edge of said inflow port of said rear-seat inflation chamber is positioned at a fore end of said linear part.

16. An air bag in use for a head protection air bag device according to claim 12, further comprising a partitioning part parting said gas passage from said rear-seat inflation chamber to thereby define said inflow port of said rear-seat inflation chamber, said partitioning part comprising a beginning part and a linear part linearly slanting downward from said beginning part in a rearward direction and said front-side peripheral edge of said inflow port of said rear-seat inflation chamber is positioned at a fore end of said linear part.