Side curtain airbag having a main chamber and an extension chamber

1. An airbag module for use in a vehicle to protect an occupant of the vehicle from a side impact collision, comprising:

an inflator configured to generate gas; and

an airbag coupled to the inflator and configured to deploy upon receiving gas from the inflator, the airbag comprising:

a main chamber extending along a side of an interior roof the vehicle and configured to restrain a head of a vehicle occupant when the airbag is deployed, the main chamber comprising an inboard panel and an outboard panel joined together;

a forward chamber including an inboard panel and an outboard panel connected to form an inflatable chamber and, wherein the forward chamber extends from the main chamber towards an A-pillar of the vehicle and configured to restrain at least a portion of the vehicle occupant when the airbag is deployed; and

a connecting panel connecting the airbag to the A-pillar, wherein the forward chamber is configured to deploy inboard and overlap with the connecting panel and wherein the connecting panel substantially covers the outboard panel and the inflatable chamber of the forward chamber when the airbag deploys and wherein the forward chamber does not overlap with a frame of the vehicle.

2. The airbag module of claim 1 , wherein the forward chamber at least partially overlaps at least one of the inboard and outboard panels of the main chamber when the airbag is stowed.

3. The airbag module of claim 2 , wherein the forward chamber is folded when the airbag is stowed.

4. The airbag module of claim 2 , wherein the connecting panel is connected to the airbag at the same location where the forward chamber overlaps with the inboard or outboard panel in a stored condition.

5. The airbag module of claim 2 , wherein the forward chamber is at least partially tucked within the inboard and outboard panels of the main chamber when the airbag is stowed.

6. The airbag module of claim 2 , wherein the forward chamber is rolled over the inboard panel or within the main chamber when the airbag is stowed.

7. The airbag module of claim 2 , wherein the airbag is stowed by Z-folding.

8. The airbag module of claim 1 , wherein during a vehicle collision the forward chamber is configured to deploy with a trajectory positioning the forward chamber between the occupant and a portion of the vehicle before the occupant can collide with the portion of the vehicle.

9. The airbag module of claim 1 , wherein the main chamber and forward chamber do not include an aperture passing through the inboard and outboard panels.

10. A side airbag for use in a vehicle, comprising:

a main chamber extending along a side of an interior roof of the vehicle and configured to restrain a head of a vehicle occupant when the airbag is deployed, the main chamber comprising an inboard panel and an outboard panel joined together;

a forward chamber including an inboard panel and an outboard panel connected to form an inflatable chamber and, wherein the forward chamber extends from the main chamber towards an A-pillar of the vehicle and configured to restrain at least a portion of the vehicle occupant when the airbag is deployed; and

a connecting panel connecting the airbag to the A-pillar,

wherein the forward chamber is configured to deploy inboard and overlap with the connecting panel wherein the connecting panel substantially covers the outboard panel and the inflatable chamber of the forward chamber when the airbag deploys and wherein the forward chamber does not overlap with a frame of the vehicle.

11. The airbag of claim 10 , wherein the airbag is configured to be coupled to a roof rail of the vehicle.

12. The airbag of claim 10 , wherein the main chamber and forward chamber do not include an aperture passing through the inboard and outboard panels.

13. The airbag of claim 10 , wherein the airbag is stowed by Z-folding.

14. The airbag of claim 10 , wherein during a vehicle collision the forward chamber is configured to deploy with a trajectory positioning the forward chamber between the occupant and a portion of the vehicle before the occupant can collide with the portion of the vehicle.

15. The airbag of claim 12 , wherein the forward chamber is folded when the airbag is stowed.

16. The airbag of claim 10 , wherein the forward chamber is rolled over the inboard panel or is at least partially rolled or tucked within the inboard and outboard panels the main chamber when the airbag is stowed.

17. A side airbag for use in a vehicle, comprising:

a main chamber extending along a side of an interior roof of the vehicle and configured to restrain a head of a vehicle occupant when the airbag is deployed, the main chamber comprising an inboard panel and an outboard panel joined together;

a chamber extending from the main chamber and configured to restrain at least a portion of the vehicle occupant when the airbag is deployed, the chamber located at the foremost or rearmost end of the airbag and; and herein the chamber includes an inboard panel and an outboard panel connected to form an inflatable chamber

a connecting panel connecting the airbag to the A-pillar, wherein the chamber is configured to deploy inboard and overlap with the connecting panel so that the connecting panel substantially covers the outboard panel and the inflatable chamber and wherein the chamber does not overlap with a frame of the vehicle.

18. The airbag of claim 17 , wherein the chamber at least partially overlaps at least one of the inboard and outboard panels of the main chamber when the airbag is stowed.

19. The airbag module of claim 18 , wherein during a vehicle collision the forward chamber is configured to deploy with a trajectory positioning the forward chamber between the occupant and a portion of the vehicle before the occupant can collide with the portion of the vehicle.

20. The airbag module of claim 18 , wherein the connecting panel is directly coupled to an outboard panel of the main chamber.