Patent ID: 7740315

Claim:
A seating unit, comprising: a base; a control attached to the base; a seat positioned on the control; and a backrest assembly pivotally attached to the control for movement between an upright position and a reclined position, the backrest assembly comprising: a backrest support having a centrally positioned spine member supporting cantilevered arms from an upper end thereof; a flexible back shell adapted to provide back support to a seated user, the back shell being attached and supported at an upper location to the cantilevered arms, and attached at a lower location to the spine member, thereby allowing the back shell to flex between the upper location and the lower location, wherein the spine member and the cantilevered arms are located externally of the back shell; and an adjustable support member attached to the spine at a lumbar region located between the upper and lower locations, and adapted to adjustably engage a rear surface of the back shell.