Deployable panel for an airbag

1. An assembly comprising:

an interior component;

a deployable panel supported by the interior component and having an upper panel and a lower panel, the deployable panel being movable relative to the interior component from a retracted position to an extended position;

a hinge between the upper panel and the lower panel; and

an airbag inflatable to an inflated position in which the airbag is positioned to abut the upper panel in the extended position;

the deployable panel being translatable relative to the interior component between the retracted position and the extended position.

2. The assembly of claim 1 , further comprising a spring on the hinge, the spring positioned to bias the upper panel relative to the lower panel.

3. The assembly of claim 2 , wherein the airbag is positioned to load the spring in the inflated position.

4. The assembly of claim 1 , further comprising a spring on the hinge, the spring biasing the upper panel toward a common plane with the lower panel.

5. The assembly of claim 1 , wherein the hinge includes a rod fixed to one of the upper panel and the lower panel, and further comprising a ratchet-and-pawl mechanism engaged with the rod.

6. The assembly of claim 5 , further comprising a spring on the rod and positioned to bias the upper panel relative to the lower panel.

7. The assembly of claim 6 , wherein the spring is positioned to bias the upper panel in a first direction relative to the lower panel, and the ratchet-and-pawl mechanism allows rotation of the upper panel relative to the lower panel in a second direction opposite the first direction and prevents rotation of the upper panel relative to the lower panel in the first direction.

8. The assembly of claim 1 , further comprising an actuator releasably coupled to the deployable panel.

9. The assembly of claim 1 , further comprising a spring biasing the deployable panel toward the extended position.

10. The assembly of claim 1 , wherein the upper panel and the hinge are positioned to be above the interior component in the extended position.

11. The assembly of claim 1 , further comprising a computer including a processor and a memory storing instructions executable by the processor to move the deployable panel relative to the interior component and subsequently inflate the airbag.

12. The assembly of claim 1 , wherein the deployable panel is rigid relative to the airbag.

13. The assembly of claim 1 , wherein the deployable panel includes a reaction surface that is flexible relative to the airbag in the inflated position.

14. The assembly of claim 1 , wherein the interior component is an instrument panel.

15. The assembly of claim 1 , further comprising a track fixed to the interior component and slidably engaging the deployable panel.

16. The assembly of claim 15 , further comprising a spring biasing the deployable panel along the track toward the extended position.

17. The assembly of claim 1 , further comprising a windshield, the deployable panel being positioned to be between the airbag and the windshield in the extended position.

18. The assembly of claim 1 , wherein the upper panel is rotatable relative to the lower panel about the hinge when the deployable panel is in the extended position.

19. An assembly comprising:

an interior component;

a deployable panel supported by the interior component and having an upper panel and a lower panel, the deployable panel being movable relative to the interior component from a retracted position to an extended position;

a hinge between the upper panel and the lower panel;

an airbag inflatable to an inflated position in which the airbag is positioned to abut the upper panel in the extended position; and

a spring on the hinge, the spring positioned to bias the upper panel relative to the lower panel; and

the airbag is positioned to load the spring in the inflated position.

20. An assembly comprising:

an interior component;

a deployable panel supported by the interior component and having an upper panel and a lower panel, the deployable panel being movable relative to the interior component from a retracted position to an extended position;

a hinge between the upper panel and the lower panel; and

an airbag inflatable to an inflated position in which the airbag is positioned to abut the upper panel in the extended position;

the hinge including a rod fixed to one of the upper panel and the lower panel; and

a ratchet-and-pawl mechanism engaged with the rod.