| 摘要 |
A seatbelt retractor forcibly winds up a webbing fastened to an occupant onto a takeup shaft by utilization of an explosive force of a powder to closely attach the webbing to the occupant for restraining and protecting the occupant in an emergency of a vehicle. The retractor is provided therein with a pressure control valve for releasing an explosive pressure exceeding a predetermined value to atmosphere, which prevents a webbing takeup force beyond necessity from acting on the takeup shaft so as not to permit the webbing to excessively oppress the occupant.
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