Seat with airbag

1. A seat, comprising:

a seatback including a top portion, a first side panel, a second side panel opposite the first side panel, and a front panel extending from the first side panel to the second side panel;

a seat bottom coupled to the seatback;

an airbag inflatable to a deployed position, the airbag in the deployed position being attached to the top portion and extending in front of the seatback, the airbag including an outer shell portion;

a tether fixed to the seatback below the top portion and attached to the outer shell portion of the airbag; and

an airbag extension inflatable from the airbag in the deployed position, the airbag extension upon inflation being disposed in a forward direction from the seat bottom;

wherein the tether defines a radial inflation path for the airbag, the path centered where the tether is fixed to the seatback;

the tether extends from the first side panel to the second side panel;

the tether is movable from an undeployed position covered by the first side panel to the airbag in the undeployed position, to a deployed position extending out of the first side panel to the airbag in the deployed position;

the first side panel includes a frangible seam extending along the tether in the undeployed position; and

the airbag in the deployed position extends between the tether and the front panel.

2. The seat of claim 1 , wherein the airbag includes a main body and a first wing and a second wing, and when the airbag is in the deployed position, the first wing extends from the main body toward the first side panel, and the second wing extends from the main body toward the second side panel.

3. The seat of claim 2 , wherein when the airbag is in the deployed position, the wings extend between the tether and the front panel.

4. The seat of claim 1 , wherein the airbag includes an inflation chamber, a main shell surrounding the inflation chamber, and a reinforcement panel extending between the tether and the main shell and attached to the main shell.

5. The seat of claim 1 , wherein the outer shell portion extends between the tether and the front panel of the seatback when the airbag is in the deployed position, and the tether extends between the outer shell portion and the front panel of the seatback when the airbag is in an undeployed position.

6. The seat of claim 1 , wherein the tether is a first tether, the seat further comprising a second tether fixed to the seatback below the top portion and attached to the airbag extension.

7. The seat of claim 6 , wherein the first tether is fixed to the seatback at a first attachment point, and the second tether is fixed to the seatback at a second attachment point below the first attachment point.

8. The seat of claim 7 , wherein the airbag extension is inflatable from an undeployed position folded against the airbag to a deployed position extending from the airbag in front of the seat bottom, the second tether is movable from an undeployed position to a deployed position, the second tether in the undeployed position extends from the second attachment point to the first attachment point to the airbag extension in the undeployed position with the airbag in the undeployed position, and the second tether in the deployed position extends from the second attachment point to the airbag extension in the deployed position.

9. The seat of claim 8 , wherein the second tether in the deployed position is spaced from the first attachment point.

10. The seat of claim 9 , wherein the second tether is movable from the undeployed position to an intermediate position to the deployed position, and the second tether in the intermediate position extends from the second attachment point to the first attachment point to the airbag extension in the undeployed position with the airbag in the deployed position.

11. The seat of claim 10 , wherein the second tether extends from the first side panel to the second side panel.

12. The seat of claim 11 , wherein the airbag extension in the deployed position extends between the second tether and the seat bottom.

13. The seat of claim 12 , wherein the airbag extension includes an inflation chamber, an extension shell surrounding the inflation chamber, and a reinforcement panel extending between the second tether and the extension shell and attached to the extension shell.

14. The seat of claim 1 , wherein the airbag in the deployed position extends more than halfway from the top portion to the seat bottom.

15. A seat, comprising:

a seatback including a top portion, a first side panel, a second side panel opposite the first side panel, and a front panel extending from the first side panel to the second side panel;

a seat bottom coupled to the seatback;

an airbag inflatable to a deployed position, the airbag in the deployed position being attached to the top portion and extending in front of the seatback;

a tether fixed to the seatback below the top portion and attached to the airbag; and

an airbag extension inflatable from the airbag in the deployed position, the airbag extension upon inflation being disposed in a forward direction from the seat bottom;

wherein the tether defines a radial inflation path for the airbag, the path centered where the tether is fixed to the seatback;

the tether extends from the first side panel to the second side panel;

the tether is movable from an undeployed position covered by the first side panel to the airbag in the undeployed position, to a deployed position extending out of the first side panel to the airbag in the deployed position;

the first side panel includes a frangible seam extending along the tether in the undeployed position;

the airbag in the deployed position extends between the tether and the front panel;

the airbag includes an inflation chamber, a main shell surrounding the inflation chamber, and a reinforcement panel extending between the tether and the main shell and attached to the main shell.

16. A seat, comprising:

a seatback including a top portion;

a seat bottom coupled to the seatback;

an airbag inflatable to a deployed position, the airbag in the deployed position being attached to the top portion and extending in front of the seatback;

a first tether fixed to the seatback below the top portion and attached to the airbag;

an airbag extension inflatable from the airbag in the deployed position, the airbag extension upon inflation being disposed in a forward direction from the seat bottom; and

a second tether fixed to the seatback below the top portion and attached to the airbag extension;

wherein the first tether is fixed to the seatback at a first attachment point, and the second tether is fixed to the seatback at a second attachment point below the first attachment point.