| 摘要 |
<p>PROBLEM TO BE SOLVED: To more surely suppress generation of backlash between a torsion bar and a member fitted with the torsion bar, even if force is applied to the torsion bar at the time of a lock operation of a lock mechanism. SOLUTION: Each of ribs 20, 21 and 22 for suppressing backlash of three arcuate cross section shapes are extended in an axial direction on inner peripheral surfaces of three sides 4a1, 4a3 and 4a5 which are not adjacent each other of an axial hole 4a of regular hexagon cross section of a reel 4. The ribs 20, 21 and 22 are provided on a side where large force is not applied from the reel 4 of each of the sides 4a1, 4a3 and 4a5. Therefore, since large force generated at the time of rotation lock of a webbing drawing direction of a locking base of the lock mechanism is not applied to the ribs 20, 21 and 22 for suppressing backlash, collapses of the ribs 20, 21 and 22 for suppressing backlash by the force can be prevented. As a result, generation of backlash due to collapses of the ribs 20, 21 and 22 for suppressing backlash is prevented.</p> |
