Pretensioner

摘要

A pretensioner (22) for a three point seat belt (14) comprising: a cylinder (22) adapted to be attached to a structural part member of a vehicle; a piston disposed within the cylinder; a pyrotechnic means for moving the piston in a direction that is longitudinal relative to the cylinder in a pretensioning direction; a slider bar (10) comprising a portion which is fixedly oriented substantially longitudinally with respect to the vehicle; a seat belt webbing (14) mounted on the slider bar (10) such that the webbing (14) can freely move along said portion of the slider bar (10) when the seat belt is not under tension; and
a cable (20) that extends from the piston and is connected to the webbing (14) to cause the seat belt webbing to move along the slider bar (10) in a pretensioning direction (A) when the pyrotechnic means for moving the piston is activated.