Adjustable back support for motor vehicles

Claim 1

An adjustable back support for motor vehicle seats comprising: at least two substantially identically shaped independently inflatable air chamber means embedded in a backrest and partially superimposed upon one another; each chamber having two horizontally disposed substantially wave-shaped boundary means defined by plural straight portions connected between plural curved portions; two adjacent curved portions along one boundary means of one inflatable air chamber means, vertically facing in opposite directions; two similarly facing curved portions on different boundary means of one inflatable air chamber means being in vertical alignment with one another; straight portions of one boundary means being parallel to straight portions of the other boundary means of the same inflatable chamber means; a cross-sectional area of an inflatable chamber means between two straight parallel portions of opposite boundary means being widest at a mid-point between two straight parallel portions on opposite boundary means and narrowly tapering from the mid-point toward the straight parallel portions of the boundary means; and wherein the at least two independently inflatable air chamber means have adjoining boundary means superimposed upon one another with all curved portions of the boundary means of the at least two independently inflatable air chamber means, which face in the same vertical direction, being in vertical alignment with one another.