Technical Paper
An Overview of Emergency Locking Retractor Performances of Shoulder Harness Safety Belt Systems in American Made Vehicles
1994-03-01
940528
With the advent of the Emergency Locking Retractors (ELRs) in the seventies, the mechanism of the seat belt safety system started becoming increasingly complex. The ELRs were made either webbing sensitive or vehicle sensitive. The former type contained an inertial device that activated after sensing webbing acceleration. The latter contained an inertia responsive pendulum mass and had the ability to lock-up whenever the vehicle experienced a sudden change in velocity or a sudden tilt or rotation. In this paper, the ELR mechanisms that employ the pendulum-pawl system are discussed and their susceptibility to fail under certain conditions investigated. The present research was conducted to evaluate the effectiveness of the ELR mechanisms and identify those conditions where the ELR was least effective.
