Vehicle seats with built-in safety belt

Claim 1

A vehicle seat comprising a base, a sitting portion mounted on the base, a seat-back mounted for pivoting movement about a first lower transverse horizontal axis linked to the base of the seat, a means for moving said sitting portion independent of said seat-back, and a safety belt, anchoring points for anchoring this belt to the vehicle seat, one anchoring point being disposed at the top of the seat-back, the framework of the seat-back comprising a vertical laterally located beam which is very flexion resistant and carries the upper anchoring point of the belt, a lower cross-piece fixed to the base of the beam and sufficiently resistant to prevent the transverse inclination of this beam and an L-shaped piece fixed on the beam and on the cross-piece so as to form a frame therewith, at least one buckling resistant strut, the ends of which are mounted for pivoting, respectively, about a second transverse horizontal axis linked to the front of the base and about a third transverse horizontal axis forming part of the beam and disposed at a distance, from the first axis, which is less than 1/6 of the distance separating the first axis from the upper anchoring point, and means acting on the strut for adjusting the position of the third axis about the first axis.