SEAT BELT RETRACTOR

摘要

A winding drum with a webbing wound thereon has one axial end rotatably supported by one sidewall section of a housing, and a shaft section raised from the other axial end is rotatably supported through a cover member mounted on the outer end of the other sidewall section of the housing. The housing has an opening formed in the other sidewall section through which a ratchet gear is inserted with gap therebetween, the ratchet gear being formed on the outer peripheral edge of the winding drum at the other axial end side thereof; and inner teeth formed on the inner peripheral edge of the opening. When pretensioner mechanism is activated and tensile force greater than predetermined level acts on the webbing, the cover member is plastically deformed through the shaft section and locks the ratchet gear into engaged state wherein the ratchet gear is engaged with the inner teeth.