Seat elevating mechanism for chair
A seat elevating mechanism for chair particularly designed for old men and patients having weak legs mainly includes a seat that can be elevated or lowered using a power-actuated telescopic lifter. The seat is maintained in a horizontal position while being elevated or lowered, so that a user may stably sit thereon until the seat is fully elevated or lowered to enable the user to get up or sit down effortlessly.
1. 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.
2. The seat elevating mechanism for chair as claimed in claim 1 , wherein said two-piece seat is fixedly provided at a top with seat cushions.