Patent ID: 7147288

Claim:
A backrest for a chair, which comprises: a frame with a membrane clamped therein, the frame comprising two lateral, essentially vertically running side parts and two essentially horizontally running upper and lower cross-pieces, connecting the side parts, the upper cross-piece interconnecting the two side parts at upper ends thereof, and the lower cross-piece interconnecting the two side parts, and the frame being suspended in the middle of the lower cross-piece on a backrest support comprising first and second legs under the seat, wherein: the backrest support is connected to the frame in one piece, the frame and the backrest support connected thereto in one piece comprises an injection molding made of a glass-fiber-reinforced polyamide resin, preferably a polyarylamide, the molding is hollow apart from the central region of the upper cross-piece and the first and second legs of the backrest support, and the first and second legs of the backrest support run together in a connecting piece, and the connecting piece runs smoothly and uninterruptedly into the lower cross-piece of the frame.