Multi-level load limiting retractor

摘要

An energy absorbing seat belt retractor having a frame, a locking mechanism to initially stop a spool from rotating in a belt protraction direction, the spool rotationally supported relative to the frame, a seat belt wound about the spool, and bias means to retract the seat belt, a mechanism means for permitting the spool to rotate in the belt protraction direction subsequent to being locked including a wire pulling device which pulls a formed wire member through a tortuous path and in so doing generates a reaction force to control the manner in which the spool rotates.