Patent ID: 6609755
Filing Date: 2003-08-26
Classification: A47C

Abstract:
A chair comprising:a frame member having a first support portion and a second support portion and a pair of space elongated rigid support members connected to opposite sides of a central control member; a seat member pivotably connected to said first support portion and having a rear support; a backrest member having an upper support portion and a front support portion, said upper support portion of the backrest being pivotably connected to an upper end of the second support portion of the frame member, said upper support portion of said backrest member includes a transverse frame member having opposite ends and each of said support members is connected to an end of said transverse frame member; and a link member pivotably connected to the rear support of the seat member and pivotably connected to the front support of the backrest member; wherein tilting movement of the backrest rearwardly relative to the frame member causes elevation of a rear portion of the seat member upon weight shifting of the chair user and wherein the seat member and backrest member have a relative center of rotation approximately coincident with the center of rotation of the hip joint of the user.