SYNCHROTILT CHAIR WITH ADJUSTABLE SEAT, BACK AND ENERGY MECHANISM

摘要

A back construction for a seating unit has a back frame, a compliant back including a back shell formed from a resiliently flexible polymeric sheet having a flexible forwardly- protruding lumbar support section that can be flexed to a plurality of different shapes. A force-generating mechanism is operably attached to at least one of the compliant back and the back frame. The force-generating mechanism is constructed to provide a biasing force that biases the lumbar support section forward to provide support for a seated user's back. The force-generating mechanism characteristically provides the biasing force without forcing a shape change in the compliant back.