Patent ID: 6158816
Filing Date: 2000-12-12
Classification: B60R,F16F

Abstract:
An energy absorbing seat belt retractor (20) comprising:a frame (22);a torsion bar means (70,70') rotationally supported relative to the frame for generating a predetermined reaction torque as it is twisted, the torsion bar characterized by an elastic deformation zone and a sharp onset into a plastic deformation zone;a spool operatively connected to rotate with the torsion bar means;a seat belt positioned on the spool;lock means (200), adaptable during a vehicle accident and operatively connected to a first portion of the torsion bar for, at least, temporarily stopping the torsion bar and the spool from rotating;wherein with the lock means activated to prevent the first portion of the torsion bar from rotating and with a load applied to the seat belt, the spool and the torsion bar are rotatable in a direction of seat belt protraction opposed by the reaction torque generated by the torsion bar as it twists.