Office seat with lumbar support

摘要

The office seat consists of a seat carried by a base, and a back. The back has an adjustable lumbar support comprising a control for simultaneous and continuous adjustment of height (h) and thickness (e) of the position of a projecting point of contact (S) with the user's lumbar region. The adjuster comprises a pair of cams (31a,31b) aligned parallel to the back axis. A flexible back pad (20), fixed to the back, and carrying the projecting contact point is held supported on the cams. The cams are set back from each other and capable of being simultaneously rotated by a control. This control comprises two endless axially coupled screws. Each screw rotates a helicoidal wheel fixed to one of the cams.