Patent ID: 7727171

Claim:
A vehicle seat having a seat back, the seat back comprising: a back frame, a retainer spring arranged in the form of a wire that extends transversely within the back frame, the retainer spring including a central portion that projects rearwardly, a cushion pad attached to the back frame, the cushion pad having a plurality of cylindrical through bores that pass therethrough in the direction of thickness thereof, and a massaging unit having a plurality of massaging elements, the massaging elements being constructed so as to be elastically deformed or compressed along moving axes and to be pneumatically expanded and contracted along the moving axes, wherein the massaging elements are formed as corrugated hollow members, wherein the massaging elements include massaging end portions, each massaging end portion having a circular shape that substantially corresponds with the cross-sectional shape of a corresponding one of the cylindrical through bores, wherein the massaging elements are disposed in the cylindrical through bores in a manner that the moving axes of the massaging elements extend along longitudinal axes of the cylindrical through bores, wherein the massaging elements are disposed on the central portion of the retainer spring, so as to be attached to the back frame via the retainer spring; and wherein the massaging elements have deformability or compressibility identical with or greater than the deformability or compressibility of the cushion pad when the massaging elements are not operated.