Abstract: An adjustable chair arm attachable to a chair body. The arm is capable of being moved horizontally, toward and away from the chair seat, and vertically with respect to the seat. The adjustable arm includes an arm frame assembly having a generally vertical section. The adjustable arm also includes an arm body having an upper housing and a sleeve portion which is slidably mounted on the generally vertical section of the arm frame assembly for vertical adjustment of the chair arm. A latching assembly is connected to the frame assembly and arm body for releasably locking the arm body in a plurality of vertical positions on the frame assembly. Lastly, an actuator, integral with the latching assembly, is provided for disabling the latching assembly.

Abstract: A one-piece shell for chairs made of a semi-rigid structural material. A plurality of parallel slots in the shell extend rearwardly from the seat section across the transition section and up the back section to form parallel ribs from the rear of the seat section into the back section. The ribs are corrugated to enable them to expand and twist individually to change the contours of the shell to accommodate different body shapes and movements.