| 摘要 |
<p>This object is to provide a boot of which the maximum contraction amount can be more effectively set to be larger and which has a predetermined strength and to provide a seat belt device which can provided improved restraint property to an occupant. A flexible portion of a boot (4) is configured in such a manner that the cross sections through tops (4a) of convexities are analogous and that the closer to a buckle supporting member (1) the convexity is, the smaller the area of the cross section of the convexity is, with the reduction ratio being constant. As a buckle (2) is pulled with relatively large force by a wire (3), the buckle (2) moves toward the buckle supporting member (1) so that the boot (4) contracts in the longitudinal direction. At this point, the convexities of the flexible portion are piled on each other in a direction perpendicular to the contracting direction. Therefore, the boot (4) can contract largely with little depending on the piled parts of the convexities and concavities. Accordingly, the maximum stroke L of the buckle (2) becomes longer than the maximum stroke L' of the conventional one, thereby effectively increasing the restraint force on the occupant by a seat belt, and thus significantly improving the restraint property by the seat belt. <IMAGE></p> |
