Patent attributes
A sofa bed includes a mattress frame, a back frame, two arm frames and two cross beams, two arm frames are connected by the two cross beams, wherein the mattress frame and the back frame are rotatably pivoted. The inner side of the arm frame is disposed with a linking mechanism. The linking mechanism has a front connecting piece, rear connecting piece and a bridge connecting piece. Two ends of the bridge connecting piece are respectively pivoted to the front connecting piece and the rear connecting piece. The bottom end of the front connecting piece is pivoted to the arm frame. The bottom end of the rear connecting piece is pivoted to the arm frame. The linking mechanism has a front connecting piece, rear connecting piece and a bridge connecting piece.