Adjusting device of a chair

Claim 1

An adjusting device of a chair, comprising: a base frame having two side walls extending from a front end thereof, a top plate connected across said two side walls and an open rear end, a first slot defined in a middle portion of each of said side walls, and a second slot defined in a rear end of each of said side walls, a first hole defined in each of said side walls and located between said first slots and said second slots, each of said side walls having a fourth slot defined inclinedly therein which is located above said second slot corresponding thereto; an inner frame having a front end thereof pivotally received between said two side walls by a first pin and a rear end of said inner frame fixedly connected to a second pin which is slidably received within said two first slots of said base frame; a bracket having an end board, two lateral plates respectively extending from said end board and a top portion connected between said two lateral plates, said top portion having an oblong hole defined therein, said two side walls of said base frame slidably received between said two lateral plates by a third pin extending through said two side walls and said two lateral plates, a fourth pin extending through said two second slots and fixedly connected between said two lateral plates; a fifth pin extending through said two fourth slots and fixedly connected between said two lateral plates, an urging element having one end thereof connected to said fifth pin and the other end of said urging element connected to an under side of said top plate of said base frame, and a transmitting means connected between said second pin and said fourth pin, said transmitting means comprising a plurality of long plates, each of said long plates having a third slot defined therein with a quick release means extending therethrough which extends through said first holes, said quick release means comprising a rod extending through said third slots and an operating handle connected to said rod, said operating handle extending laterally from one of said side walls such that said long plates fixedly clamp said rod when said operating handle is pushed.