Patent attributes
A seat belt retractor includes a spool for winding a seat belt; a lock mechanism having a locking member for rotation with the spool in a normal state and for stop-rotation in a seat belt withdrawal direction in an emergency state; a torsion bar disposed between the spool and the locking member for absorbing energy of a passenger when the spool rotates in the seat belt withdrawal direction relative to the locking member in the emergency state; a stopper screwed in a shaft of the locking member to be movable in an axial direction along the shaft of the locking member when the spool rotates relative to the locking member; and an energy-absorption member disposed on one of the stopper and the locking member for deforming in a shear mode when the stopper moves in the axial direction along the shaft of the locking member.
