Shape-adjusting mechanism for backrest

摘要

A shape-adjusting mechanism for a backrest has a lumbar basket which includes a pair of supports spaced apart along a predetermined axis. Resilient axial ribs are fastened between the brackets, and resilient transverse ribs are fastened to the axial ribs. The axial ribs are structured to flex as the supports are drawn together, to achieve a profile that better conforms to the shape of a user's spine. To that end, each axial rib is stamped with reinforcing flanges that extend partially along its length and produce lengthwise rib sections of different bending resistance that determine the profile of the lumbar basket in its flexed state. No separate stiffening component or additional stamping operation is required.