Roof mounted passenger airbag with lower leg protection

An apparatus for helping to protect an occupant of a vehicle seat in a vehicle in the event of a collision that results in forward movement of the occupant relative to the seat, the seat being mounted on a vehicle floor and including a seat base and a seatback, the apparatus comprising:

• an airbag having a stored, pre-deployment condition in a roof of the vehicle above the seat, the airbag being inflatable downward from the vehicle roof toward the vehicle floor to a deployed condition, the airbag comprising:
• an upper portion configured to, in the deployed condition, extend from the roof down in front of the seatback and terminate above the seat base, the upper portion comprising a rear surface that faces the seatback and a front surface that faces away from the seatback;
• and
• a lower portion configured to, in the deployed condition, extend downward and forward from the front surface of the upper portion, the lower portion being configured to, in the deployed condition, extend in front of the seat base and below an upper surface of the seat base;
• wherein the upper portion is configured to receive a head and torso of the occupant when moving forward in response to the collision,
• wherein the lower portion is configured to receive lower legs of the occupant when moving forward in response to the collision, the lower legs being positioned forward of the seat base and extending below the upper surface of the seat base with feet of the occupant resting on the vehicle floor, and
• wherein the airbag is configured so that the occupant's head and torso moving forward into engagement with the upper portion produces a rotation of the airbag that results in the lower portion exerting a downward force on the occupant's lower legs.