Abstract: An assembly for transforming a piece of furniture from a sitting position to a lying position according to the invention, having two mechanisms placed in the furniture box, and a motor acting through intermediate elements on the sliding seat of the furniture, and each of the mechanisms has a lift, which is made of a fastening slat fastened to a fixed element of furniture, the rear arm articulated at the lower end with the fastening slat and the upper end with the angle slat, and the front arm articulated at the bottom end with the fastening slat and the upper end with the angle slat, the angle slat of each lift having holes for fastening the seat. The assembly allows for obtaining an intermediate position during the transformation of the furniture.

Abstract: A mechanism for transforming furniture from a sitting position to a lying down position has right and left jacks with identical design, which are a mirror reflection of each other, connected by a synchronisation mechanism. Each jack has a fastening plate which attaches the jack to the furniture body, angle bars, upper and lower for connecting with the mattresses, a spring and a front pull rod and rear pull rod with centre arms. Each jack has a backrest driving sub-assembly created from a backrest rotation pull rod and support to be connected with the backrest of the furniture, whereas the backrest rotation pull rod is connected in an articulated manner on one end with the bottom end of the rear pull rod, and on the second end is connected in an articulated manner with the support connected in an articulated manner to the fastening plate.