A CHAIR

摘要

A chair includes a seat (4) and a backrest (5). The seat (4) includes a front seat part (41) which is carried by a chair base structure (1, 2, 7, 71), and a rear seat part (42) which borders on the front seat part (41) along a join line that extends generally perpendicular to a symmetry plane of the chair (3). The chair includes means (7) for selectively adjusting the distance between the seat join line (43) and the backrest (5) so as to enable a chair user sitting on the seat (4) with his back in contact with the backrest (5) to take a sitting position in which his hip joints lie generally in a vertical plane that includes the join line (43). Means (8, 9, 14, 15, 16) are provided for moving the rear seat part (42) vertically relative to the front seat part (41). Said means include a lever (9) and a support point (15) which is stationary relative to the front seat part (41). The blocking device (14) has a variable length and, in one end position, functions to cause the lever (9) to hold the rear seat part (42) flush with the front seat part (41). The chair also includes a triggering device (16) which upon manual activation functions to reduce the length of the blocking device (14) and thereby lower the rear seat part (42) relative to the front seat part.