Patent ID: 7021713

Claim:
A seat elevating mechanism for chair, comprising a chair, a two-piece seat, a seat support, and a telescopic lifter; said seat support including a mounting bracket fixedly mounted on the chair at a predetermined position, two horizontal arms fixedly connected at front ends to said mounting bracket, a seat-board supporting frame for two seat boards of the two-piece seat to connect thereto, and two laterally corresponded links; said seat-board supporting frame being pivotally connected at a front side to said mounting bracket, so as to turn about two first pivoting points relative to said mounting bracket; said seat-board supporting frame including a front and a rear portion pivotally connected to one another at two second pivoting points; said two links being pivotally connected at respective front and rear ends to free ends of said two horizontal arms and two lateral sides of said rear portion of said seat-board supporting frame, respectively, at third and fourth pivoting points, such that said first, said second, said third, and said fourth pivoting points form four points of a parallelogram; and said telescopic lifter including a base pivotally connected to said rear portion of said seat-board supporting frame, and an extendable pipe pivotally connected at an outer end to a rear bottom of said chair; whereby when said telescopic lifter is actuated, said rear portion of said seat-board supporting frame is elevated while maintaining in a horizontal position.