Patent ID: 7503626

Claim:
A chair comprising: a tiltable seat carrier and a tiltable backrest supported by a backrest carrier, the backrest carrier including a bearing positioned thereon, an underside of the seat carrier including a bearing block in which a rod having a lifting element is vertically movably mounted, the rod also being mounted at one end thereof in said bearing on the backrest carrier, the bearing block having a vertical slot formed therein and a slideway contour, and a flange located on the backrest carrier, the lifting element being connected to the rod by said flange, said flange being vertically movably mounted in the slot, and having a collar connected thereto, the slideway contour of said bearing block having a rectangular shape with a plurality of straight sides which are connected to one another by first rounded corners, a first side of the slideway running parallel to the slot and a second side thereof running horizontally above the slot, and the collar having an equilateral triangular shape with three straight sides which are connected to one another by second rounded corners, the flange being seated in a corner portion of the collar and said corner portion of the collar being positioned at a front upper corner of the slideway contour when the flange is in an upper position and being positioned at a front lower corner of the slideway contour when the flange is in a lower position, wherein the front upper corner and front lower corner of the collar are respectively supported on the slideway contour upon upward and downward movement of the flange.