Abstract: A belt anchor incorporating seat track structure is employed in an occupant restraining seatbelt system for a vehicle and incorporates a seatbelt anchor for retaining a belt in the seatbelt system. The structure includes a lower rail which is rigidly secured to the vehicle and an upper rail which is movable along the lower rail in the longitudinal direction of the vehicle. A seat of the vehicle is rigidly secured to the upper rail through a lower arm. The structure further includes a lock pin which extends through the lower arm and the lower rail. The load which acts on the belt anchor is transmitted to the lower rail through the pin. In addition, one end portion of the upper rail extends so as to overlap one end portion of the lower rail, so that the load acting on the belt anchor is further transmitted to the lower rail through the overlapping portions.

Abstract: A belt anchor incorporating a seat track structure for a vehicle whereby the load applied when a emergency situation occurs is supported by the body of the vehicle through a seat mounted on the vehicle and the seat is supported on the vehicle body in such a manner as to be movable in the longitudinal direction of the vehicle. An upper rail which is rigidly secured to the seat is supported on a lower rail rigidly secured to the vehicle body in such a manner that the upper rail is movable along the lower rail in the longitudinal direction of the vehicle through first and second rotary support means. A belt anchor is rigidly secured to the upper rail, and a guide plate is rigidly secured to one edge portion of the lower rail in such a manner as to accommodate the second rotary support means defined by a plurality of balls and to clamp one edge portion of the upper rail by these balls. The other edge portion of the lower rail is formed such as to have a substantially U-shaped cross-section.

Abstract: A door beam of a motor vehicle is provided in a vehicle door. Section modulus of the door beam is progressively decreased from a center section toward opposite ends of the door beam and the contour of cross-section of the door beam is of a continuously formed round wave shape, whereby the door beam absorbs an impact of a collision by virtue of imparting the force of the impact to both bending and tensile forces so that the bending moment acting on the center of the door beam decreases.