Gas containment and release device for an inflator

1. An external containment device for an inflator, the containment device comprising:

an outlet plate having an outlet opening;

a burst disk disposed over the outlet opening;

an initiator having a support member;

a movable support comprising a wedge having an opening therethrough and a projectile releasably secured to the support member, a portion of the projectile being received in the opening in the wedge to position and secure the wedge between the support member and the burst disk, the wedge being disposed between the support member and the burst disk, the movable support providing support to the burst disk;

wherein activation of the initiator causes the projectile to travel through the opening thereby allowing the wedge to be displaced and the burst disk to rupture.

2. The containment device as in claim 1 , wherein the wedge further comprises a vent opening.

3. The containment device as in claim 1 , wherein the projectile strikes the burst disk after activation of the initiator.

4. The containment device as in claim 1 , wherein the wedge is capable of movement from a first position to a second position after activation of the initiator and the wedge no longer provides support to the burst disk when the wedge is in the second position.

5. The containment device as in claim 1 , wherein the outlet plate, the burst disk, the initiator, the support member and the wedge are received within a housing having an outlet opening.

6. The containment device as in claim 5 , wherein the housing has a screen member disposed between the outlet opening and the wedge.

7. An inflation device for inflating an inflatable cushion of an airbag module, the inflation device comprising:

a first chamber and a second chamber, the first chamber having a first volume of inflation gas and the second chamber having a second volume of inflation gas;

a first inflation opening for allowing the first volume of inflation gas to pass therethrough;

a second inflation opening for allowing the second volume of inflation gas to pass into the second chamber;

an external containment device sealing the first inflation opening, the containment device comprising:

an outlet plate having an outlet opening;

a burst disk disposed over the outlet opening;

an initiator having a support member;

a movable support comprising a wedge having an opening therethrough and a projectile releasably secured to the support member, a portion of the projectile being received in the opening in the wedge to position and secure the wedge between the support member and the burst disk, the wedge being disposed between the support member and the burst disk, the support providing support to the burst disk;

wherein activation of the initiator causes the projectile to travel through the opening thereby allowing the wedge to be displaced and the burst disk to rupture.

8. The inflation device as in claim 7 , wherein the wedge further comprises a vent opening.

9. The inflation device as in claim 7 , wherein the projectile strikes the burst disk after activation of the initiator.

10. The inflation device as in claim 7 , wherein the wedge is capable of movement from a first position to a second position after activation of the initiator and the wedge no longer provides support to the burst disk when the wedge is in the second position.

11. The inflation device as in claim 7 , wherein the outlet plate, the burst disk, the initiator, the support member and the wedge are received within a housing having an outlet opening and wherein the housing has a screen member disposed between the outlet opening and the wedge.

12. The inflation device as in claim 7 , wherein the first volume of inflation gas is selected from the group comprising helium, argon, carbon dioxide, nitrogen and mixtures thereof and the second volume of inflation gas is selected from the group comprising helium, argon, carbon dioxide, nitrogen and mixtures thereof.