Dual mode seat belt retractor assembly

摘要

A dual mode seat belt retractor assembly particularly useful for motor vehicles is described. The seat belt retractor according to this invention converts between an emergency locking retractor which locks only when the vehicle is subjected to a deceleration level above a predetermined level to an automatic locking mode wherein withdrawal of webbing from the retractor is inhibited. An automatic locking retractor is advantageous for firmly positioning child restraint systems. The emergency locking retractor, however, has advantages in terms of occupant comfort and convenience for adult occupants since they provide freedom of movement within the vehicle. In accordance with this invention, the retractor is converted between automatic locking and emergency locking operating modes through rotation of a drive plate which moves an actuator lever between two positions of engagement with an actuator cam rotatable with the retractor spool. One position permits normal operation of the retractor as an emergency locking retractor while another provides automatic locking operation.