Air bag module with vent flow control

摘要

An apparatus ( 10 ) for helping to protect an occupant of a vehicle includes a housing ( 20 ) including a vent opening ( 70 ). An air bag ( 14 ) is inflatable to deploy away from the housing ( 20 ). An inflation fluid source ( 26 ) provides inflation fluid for inflating the air bag ( 14 ). A vent member ( 80 ) has a closed condition blocking inflation fluid flow through the vent opening ( 70 ) and an open condition permitting inflation fluid flow through the vent opening. A first tether ( 114 ) is configured to release the vent member ( 80 ) for movement from the closed condition when the air bag ( 14 ) has deployed a first distance away from the housing ( 20 ). A second tether ( 140 ) is configured to place the vent member ( 80 ) in the closed condition when the air bag ( 14 ) has deployed a second distance away from the housing ( 20 ), the second distance being farther away from the housing than the first distance.