Patent ID: 7552975

Claim:
A chair and backrest attachment device for the chair, which comprises: a frame, two armrests, a seat, and a backrest with a backrest support having an elongated hole formed thereon, wherein the backrest is spaced apart from the seat and the seat and backrest are arranged on the chair without a direct connection therebetween, a metal bow with two bends and comprising a shorter intermediate piece with a 90° bend which is connected to a long flank that is longer than the shorter intermediate piece, the shorter intermediate piece in turn having connected to it a shorter end piece with a 90° bend, wherein a plane is formed by the long flank and the intermediate piece and another plane is formed by the shorter intermediate piece and the end piece, the planes being perpendicular to each other, wherein the metal bow is positionable with the long flank located within the backrest frame and the shorter intermediate piece extending through the elongated hole formed in the backrest frame, and an interlocking device positioned within the backrest frame with which said metal bow is interlocked, wherein the end piece of the metal bow is connectable to the frame of the chair.