Patent ID: 8662435

Claim:
A webbing take-up device comprising: a cylindrical spool having an axis of rotation on which a webbing to be applied to a passenger of a vehicle is wound, and a centrally disposed opening having an insertion end and an opposing end; at least one insertion groove having two axially-oriented walls parallel to the axis of rotation defined in the surface of the spool opening, the distance between the walls abruptly increasing at an axial location in a direction away from the insertion end of the spool opening to define a catch groove having a catch surface that is located between the walls of the catch groove and is oriented substantially perpendicular to the axis of rotation; and a torsion bar that is inserted into the insertion end of the spool opening; and a catch projection that is provided on the torsion bar, the thickness of the projection being less than the distance between the walls of the catch groove, wherein the catch projection extends beyond the plane of the catch surface in the axial direction in a state in which the torsion bar is inserted into the spool so that the torsion bar is affixed to the spool by the torsion bar being rotated in one direction around the axis of rotation of the spool whereby the catch projection rotates into an assembled position wherein the catch projection overlaps the catch surface in the axial direction.