Airbag module

1. An airbag module for protecting an occupant of a vehicle seat, the airbag module comprising:

an inflatable cushion;

an inflator for providing an inflation gas for the cushion;

wherein the cushion is configured to inflate into a position inboard of the vehicle seat and includes a first inflatable chamber fluidly connected to a second inflatable chamber, wherein the second inflatable chamber is located internal to the perimeter of the cushion;

wherein the cushion is configured to inflate into a position in which the first inflatable chamber is in a position to absorb energy resulting from relative movement of the torso of the occupant in a direction lateral to the longitudinal axis of the vehicle, and wherein the second inflatable chamber is configured to inflate into a position to absorb energy resulting from relative movement of the head of the occupant;

wherein the second inflatable chamber is positioned laterally towards the occupant relative to the first inflatable chamber.

2. The airbag module of claim 1 , wherein the second inflatable chamber is surrounded by the first inflatable chamber.

3. The airbag module of claim 2 , wherein the second inflatable chamber is configured to inflate into a position closer to the occupant of the seat than the first inflatable chamber.

4. The airbag module of claim 1 , wherein the first and second inflatable chambers are fluidly connected by a passage.

5. The airbag module of claim 4 , wherein the passage is located below the second inflatable chamber.

6. The airbag module of claim 4 , wherein the passage is located above the second inflatable chamber.

7. The airbag module of claim 1 , wherein the second inflatable chamber pivots relative to a vertical axis.

8. An airbag module for protecting an occupant of a vehicle seat, the airbag module comprising:

an inflatable cushion;

an inflator for providing an inflation gas for the cushion;

wherein the cushion is configured to inflate into a position inboard of the vehicle seat and includes a first inflatable chamber fluidly connected to a second inflatable chamber;

wherein the cushion is configured to inflate into a position in which the first inflatable chamber is in a position to absorb energy resulting from relative movement of the torso of the occupant in a direction lateral to the longitudinal axis of the vehicle, and

wherein the second inflatable chamber is surrounded by the first inflatable chamber and is configured to inflate into a position laterally towards the occupant from the first inflatable chamber to thereby absorb energy resulting from relative movement of the head of the occupant.

9. The airbag module of claim 8 , wherein the second inflatable chamber pivots along a substantially vertical axis to move toward the occupant.

10. The airbag module of claim 8 , wherein the second inflatable chamber pivots along a substantially horizontal axis to move toward the occupant.

11. The airbag module of claim 8 , wherein first and second inflatable chambers are fluidly connected through a passage that permits inflation gas to move in a substantially horizontal direction.

12. The airbag module of claim 8 , wherein first and second inflatable chambers are fluidly connected through a passage that permits inflation gas to move in a direction substantially downward towards the floor of the vehicle.

13. The airbag module of claim 8 , wherein the airbag includes a sail panel that covers the second inflatable chamber and is positioned so that the second inflatable chamber is located between the sail panel and the seat.

14. An airbag module for protecting an occupant of a vehicle seat, the airbag module comprising:

an inflatable cushion;

an inflator for providing an inflation gas for the cushion;

wherein the cushion includes first and second inflatable chambers and is configured to inflate into a position inboard of the vehicle seat;

wherein the first inflatable chamber is configured to inflate into a position to absorb energy resulting from relative movement of the torso of the occupant in a direction lateral to the longitudinal axis of the vehicle,

wherein the second inflatable chamber is configured to inflate into a position laterally towards the occupant from the first inflatable chamber to thereby absorb energy resulting from relative movement of the head of the occupant; and

wherein first inflatable chamber is larger than the second inflatable chamber;

wherein the first inflatable chamber surrounds the second inflatable chamber;

wherein the first and second inflatable chambers are fluidly connected by a passage for inflation gas; and

wherein the perimeter of the second inflatable chamber is not connected to the first inflatable chamber except for along the flow passage.

15. The airbag module of claim 14 , wherein the airbag includes a sail panel that covers a side of the second inflatable chamber opposite to the occupant to thereby urge the second inflatable chamber to pivot towards the occupant upon inflation.

16. The airbag module of claim 15 , wherein the second inflatable chamber pivots along a substantially vertical axis to move toward the occupant.

17. The airbag module of claim 15 , wherein the second inflatable chamber pivots along a substantially horizontal axis to move toward the occupant.

18. The airbag module of claim 14 , wherein the passage is configured to direct inflation gas to move in a substantially horizontal direction.

19. The airbag module of claim 14 , wherein the passage is configured to direct inflation gas to move in a direction substantially downward towards the floor of the vehicle.

20. The airbag module of claim 14 , wherein the airbag includes a non-inflatable region surrounded by the first inflatable chamber.