| 摘要 |
<p>An office chair (1) comprising a seat (2) and a backrest (3), wherein the backrest (3) includes a lumbar support (4), which is adjustable between an inactive position in which it follows the general shape of the backrest (3), and a fully active position in which it is curved outwards forwardly from the backrest (3) in order to support the lumbar back portion of a person seated on the seat (2) of the chair (1). The seat (2) is tiltable about a first pivot point (A) between an initial position, and a slightly forwardly tilted second position, wherein the position of the seat is adjusted by means of the centre of gravity (G) of a person seated in the chair, such that when the centre of gravity (G) is behind the pivot point (A) the seat (2) rests in the first position and when the centre of gravity (G) is in front of the pivot point (A) the seat (2) rests in the second position, and in that the position of the lumbar support (4) is governed by the position of the seat (2) such that it is positioned in the inactive position when the seat (2) is in the initial position, and in the active position when the seat (2) rests in the tilted position, in order to support the lumbar back portion of a person seated on the seat (2) of the chair (1) when said person is leaning forwards.</p> |
