Chair back and seat adjustment mechanism

Claim 1

A chair adjustment mechanism for use with a chair having a seat, a back and a pedestal comprising a) an elongated frame mounted on the pedestal in a manner to hold such frame in a substantially horizontal plane; b) a seat support piece pivotally mounted about a first horizontal pivot pin on the frame; c) a back bracket mounted about a second horizontal pivot pin on the seat support piece; d) a first set of friction plates having elongated slots therein mounted to the second pivot; e) a second set of friction plates having elongated slots therein mounted to a third horizontal pivot pin on the back bracket; and f) a horizontal adjustment handle mounted through the frame and the slots of such sets of plates which first friction plate slots are aligned with one another and said second friction plate slots are aligned with one another while each such slot set is at an angle to the other slot set and such adjustment handle is rotatable to compress the plates together in lock position whereby the seat and back are adjustable about spaced apart pivot pins and each is capable of being held in selected independent orientations with the horizontal frame.