Sofa bed

A sofa bed comprising:

• a load-bearing frame constituted by a rear side and by two lateral members which are mutually coplanar so as to define for said sofa bed a resting base which is open on the opposite side with respect to said rear side;
• a first bed frame which is hinged to said load-bearing frame proximate to said rear side and is movable by means of rotation between a sofa configuration of said sofa bed, in which said first bed frame is arranged substantially in a position perpendicular to the plane of extension of said load-bearing frame so as to act as the backrest of said sofa, and a bed configuration, in which said first bed frame is arranged substantially in a position parallel to and superimposed on said load-bearing frame;
• and
• a second bed frame which is associated by way of kinematic means with said load-bearing frame and is movable by way of combined rotation and translation between said sofa configuration, in which said second bed frame is arranged substantially in a position parallel to and superimposed on said load-bearing frame so as to act as the seat of said sofa, and said bed configuration, in which said second bed frame is arranged substantially in a position parallel to and outside said load-bearing frame so as to contribute, together with said first bed frame, to the definition of the bedding surface of said bed;
• wherein the hinge axis defined between said first bed frame and said load-bearing frame is eccentric with respect to the plane defined by said load-bearing frame on the opposite side with respect to said resting base, and in that said kinematic means comprise a pair of actuation levers which are joined together by a crossbar and are hinged, at one end, to the free ends of said lateral members and, at the other end, eccentrically with respect to the plane defined by said second bed frame, to a complementary frame which is integral with said second bed frame.