US 2002/0158162 A1 · Seat belt retractor

Abstract

A seat belt retractor includes a base frame, a spool journalled to the base frame, a webbing wound around the spool, and a motor for rotating the spool. A speed-reduction mechanism is interposed between the motor and the spool. The speed-reduction mechanism includes at least one transmission train with a predetermined gear ratio, a common transmission element connected to the transmission train, and a resistant torque device connected to the transmission train. The common transmission element transmits rotation of the motor to the spool when the torque of the rotation is smaller than the preset value. Winding of the webbing is made based on the wearing condition of the webbing and the running condition of the vehicle.

Claims9

Dependent claims

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, and switching means for connecting the transmission train to the spool shaft corresponding to a driving signal obtained from an external unit.

3 more elements

Dependencies are inferred from the claim text.

Seat belt retractor

Life of this patent

Seat belt retractor

Life of this patent

Abstract

Claims9