| 摘要 |
In a retractor for seat belt according to the present invention, a stopper mechanism 50 is provided between a side plate 101a and a bobbin 1. The stopper mechanism 50 is composed of a through hole 110 formed in the side plate 101a by drawing the same inwardly, and three lock pieces 3 which are respectively disposed on the locking base side end face of the bobbin 1 and are engageable with the inner peripheral surface of the through hole 110 so as to stop the rotation of the bobbin 1 in the webbing drawn-out direction thereof with respect to the side plate 101a. In addition, a control plate 4 is interposed between a locking base 5 and the bobbin 1. When a torsion bar 2 is torsionally deformed and in turn the amount of rotation of the bobbin 1 in the webbing drawn-out direction thereof with respect to the locking base 5 reaches or exceeds a predetermined amount, the control plate 4 brings the lock pieces 3 into engagement with the inner peripheral surface of the through hole 110 so as to restrict the deformation amount of a plastically deforming member to a predetermined range of amount.
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