Gas generator for seat belt pretensioner

摘要

An apparatus comprises vehicle seat belt webbing ( 18 ), a cylinder ( 50 ), and a piston ( 60 ) movable in the cylinder to effect pretensioning of the seat belt webbing. The apparatus also comprises a fluid source ( 10 ) for providing fluid under pressure to move the piston ( 60 ) in the cylinder ( 50 ). The fluid source ( 10 ) comprises a propellant container ( 122 ) defining a propellant chamber ( 123 ) and a propellant ( 82 ) in the propellant chamber. The propellant ( 82 ) is ignitable to produce fluid under pressure. The propellant container ( 122 ) comprises a first portion ( 124 ) made from plastic and a second portion ( 126 ) made from metal. The metal portion ( 126 ) is secured to the plastic portion ( 124 ) to effect a hermetic seal of the propellant container ( 122 ).