Patent ID: 8454091

Claim:
A chair adjustment mechanism for adjusting a position of a chair component with respect to a chair base structure, said mechanism comprising: a first adjustment shaft; a second support shaft; a set of friction plates, said friction plates being fixedly mounted on the second support shaft, and slideably mounted on the first adjustment shaft, each friction plate comprising an elongated slot; a guiding structure mounted on the chair base structure for guiding movement of the second support shaft along a direction of travel of the chair component, the guiding structure having a guiding structure elongated slot substantially similar in shape to the elongated slots of the friction plates, and sized to slideably receive the second support shaft for displacement of the support shaft therealong; an adjustment handle mounted on the first adjustment shaft, the handle being rotatable to reversibly compress the friction plates together in a locked position, wherein the chair component is mounted on the second support shaft and the position of the component is controlled through corresponding movement of the second support shaft along the guiding structure.