| 摘要 |
A preloader for use in a webbing retractor for retracting an occupant-restraining webbing onto a takeup shaft so as to allow the webbing to be applied to the occupant with appropriate tightness. A rotating drum disposed coaxially with the takeup shaft has an annular groove. A wedge member is held around the rotating drum at a certain distance from the rotating drum by a shear pin. A wire is wound in advance around the outer periphery of the wedge member. At the time of a sudden deceleration of a vehicle a driving force is applied to the wire, and the wire in turn tightens the wedge member by being more tightly wound therearound. The shear pin is broken by the tight winding by the wire, and the wedge member is wedge-fitted to the rotating drum, so that the wedge member and the rotating drum rotate integrally and cause the takeup shaft to rotate.
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