Seat belt retractor with energy absorbing lock wheels

摘要

A safety restraint system comprising: a safety belt system for restraining an occupant comprising: a safety belt; a retractor for protracting and retracting the safety belt, a shoulder belt support for supporting the shoulder belt portion of the safety belt; a pretensioner for providing, subsequent to activation, a preload tensile force in the shoulder belt portion in excess of a first low limit value of about 50 pounds; a load limiter for limiting the loads imparted by the shoulder belt portion to an occupant, operative after the preload acts on the shoulder belt portion, including first means for introducing a predetermined amount of slack in the shoulder belt when the belt tension is above a second low limit value and for preventing such slack introduction when belt tension is lower than such second low limit value.