Patent ID: 6431649
Filing Date: 2002-08-13
Classification: A47C

Abstract:
A working chair with a seat (2, 12), a back (4, 14) and a lower frame, the frame comprises, a vertical adjustable supporting pillar and a carrier Frame (1,11) connected with an upper end of said pillar, the seat (2,12) being pivotally connected with said carrier frame in proximity of its front edge by a first pivot connection(3,13) with a horizontal axis of rotation,said first pivot connection (3, 13) comprising a pivot pin (3a, 13a) connected with the seat (2, 12) and the carrier frame (1, 11), one of said seat and said carrier frame being provided with a track (3b, 13b) inclined with respect to a horizontal direction for allowing a substantially translatory movement of the seat (2, 12) perpendicular to the axis of rotation with respect to said carrier frame, whereas a mounting arm (7, 17) in firm connection with a back support(5, 15) connected with the back (4, 14) is pivotally connected with the carrier frame (1, 11) as well as with the seat (2, 12) by second and third pivot connections (8,9; 19,21) having axes of rotation mutually parallel and parallel with the axis of said first pivot connection (3, 13), said pivot connections being designed for synchronous movement of the seat (2, 12) and the back (4, 14), whereby the seat (2, 12) from a backwards declining rest position by rotation in said first pivot connection (3, 13) may be moved to a working position and the back (4, 14) synchronously therewith may be moved from a backwards declining extreme position in which it forms a maximum angle with the seat towards a more upright position while gradually reducing its angle with the seat, wherein the track (3b, 13b) is directed obliquely upwardly towards the front edge of the seat (2, 12) and is inclined at an angle of 40Â° to 70Â° with the vertical axis of the supporting pillar to provide a range of said translatory movement by which the seat (2, 12) is movable from said backwards declining rest position in which the front edge of the seat (2, 12) is displaced backwards and downwardly with respect to the carrier frame (1, 11) to a forward declining extreme position, in which the front edge of the seat (2, 12)is displaced forwardly and upwardly with respect to the carrier frame (1, 11).