Abstract: The present application relates to a chair which adapts to dynamic body postures of a user. The posture adaptive work chair includes a seat sub-assembly having a front edge and a seat base sub-assembly; a pair of spine members cantilevered from the font edge of the seat sub-assembly; a back sub-assembly supported by the pair of spine members, and configured to flex in multiple axes based on a direction of load applied by a user; and a tilt limit lever movably coupled to the seat base sub-assembly and configured to enable tilting of the back-sub assembly to a plurality of tilt positions.

Abstract: An adjustable chair comprises chair support, backrest, a backrest support mechanism including at least one backrest arm pivotally connected to the support, and a seat having front and rear regions and a seat surface. The chair includes first and second seat support mechanisms with the first mechanism adjustably connecting the front region of the seat and the second mechanism adjustably connecting the rear region. The second seat support mechanism includes at least one seat arm having front and rear arm extensions and connected to the support for pivotal movement about a horizontal axis. The rear arm extension is pivotally connected to the rear region of the seat. A toggle arrangement is pivotally mounted on the chair support and engages the front end section of the at least one seat arm and front end section of the at least one backrest arm.