Seat belt retractor system

摘要

A new and improved seat belt retractor system having an electronic control unit which is adapted to receive a signal from a sensor responsive to the buckling of the seat belt and causes an electric motor acting through a chain drive to drivingly rotate a reel in one direction for providing a predetermined seat belt loading on the seat occupant and that is responsive to the braking of the vehicle under emergency conditions to increase the tensioning of the seat belt to a level that exceeds the predetermined seat belt loading.