Abstract: The present invention pertains to a vehicle seat with an integrated frame and restraint assembly that is particularly suited for a truck. The frame assembly includes a seat frame mounted to a slide rail pedestal anchored to the vehicle floor, and a back frame joined to the seat frame. The frame has a lightweight construction and includes a conventional recline assembly for maintaining the seat back in one of a variety of recline positions. The restraint assembly has a lap and shoulder belt that is firmly secured to the frame. The seat frame has a pair of upwardly extending struts with rearward facing angled surfaces. The back frame has a pair of forwardly extending struts with forward facing angled surfaces. The angled surfaces flushly engage each other when the seat is in an upright position. Should the recline mechanism fail during a sudden deceleration or accident, the forward rotation of the back frame will stop at its upright position.

Abstract: A lumbar support for a seat which has a back and a seat portion. The back of the seat contains the lumbar support and is adapted to recline with respect to the seat portion. The lumbar support includes two flexible lumbar supports, a fixed support member, a movable support member, a track for guiding the movable support member along a predetermined path of travel, and an assembly for advancing the movable support member to adjust the curvature of the flexible lumbar supports.

Abstract: A suspension system has a base, mountable to the floor of a vehicle, and a frame above the base. The base and frame are coupled by a linkage, for example two, spaced pairs of crossed links. A mechanical spring, preferably in the form of a torsion bar, is mounted in one of the base and frame. A lever is coupled to the spring means. A roller assembly mounted in the links is movable along the lever arm to vary its length and to act as a fulcrum. The lever has a cam lobe so that movement of the roller assembly arcuately moves the torsion bar to preload same, as the length of the lever arm is altered. Varying the length of the lever arm and the preloading of the spring responsive to differing occupant's weights maintains constant natural frequency and centers the suspension system in the ride zone.