Patent ID: 7918506

Claim:
A padding structure for a chair comprising: a support; a foam disposed on the support; first, second and third resilient members located intermediate the foam and the support, with the third resilient member located intermediate the first and second resilient members, wherein each of the first, second and third resilient members is an arcuate flexible plate having two ends connected together by a guiding line to change a distance between the two ends along a length adjustment axis so as to adjust radii of curvature; the first resilient member having a first central axis that is perpendicular to the length adjustment axis of the first resilient member, the first resilient member having a first adjustable radius of curvature relative to the first central axis; the second resilient member having a second central axis that is substantially parallel to the first central axis and that is perpendicular to the length adjustment axis of the second resilient member, the second resilient member having a second adjustable radius of curvature relative to the second central axis; the third resilient member having a third central axis that is perpendicular to the length adjustment axis of the third resilient member and that is substantially perpendicular to the first and second central axes, the third resilient member having a third adjustable radius of curvature relative to the third central axis; and an adjustable member controlling the expansion and retraction of the guiding lines to drive the resilient members to change the first, second, and third radii of curvature, wherein the third resilient member at least spans a width of the first and second resilient members in a direction of the first and second central axes.