Patent ID: 6604597
Filing Date: 2003-08-12
Classification: B60R

Abstract:
A seat belt retractor, comprising:a base frame, a spool having a spool shaft journalled to the base frame, a webbing wound around the spool, a return spring connected to the spool for winding the webbing by a return force thereof, a motor connected to the spool for winding the spool, winding of the webbing being made by one of the return spring and the motor by switching, and a speed-reduction mechanism interposed between the motor and the spool, said speed-reduction mechanism including a transmission train with a predetermined reduction gear ratio, said transmission train having a planetary gear unit having an internal gear with ratchet teeth formed on an outer periphery of the internal gear, and switching means for connecting the transmission train to the spool shaft corresponding to a driving signal obtained from an external unit, said switching means having pawl mechanism engaging one of the ratchet teeth to fix rotation of the internal gear.