Foldable sofa-bed with folding-assist and extension-assist mechanisms

A foldable sofa-bed, comprising:

• a frame with opposed arms;
• a backrest operatively connected to the frame;
• a seat;
• a subseat hinged to the seat and pivotable relative thereto;
• a backrest mechanism attached to the frame and to the backrest, wherein the backrest mechanism includes front and rear swing links, each of the front and rear swing links being pivotally interconnected with the frame and the backrest;
• and
• a rear leg pivotally interconnected with the backrest, said rear leg having upper and lower segments interconnected at a first pivot, and wherein the upper segment of the rear leg is pivotally attached with the backrest;
• wherein the frame, backrest, seat and subseat are configured to move between a folded position, in which the backrest is generally upright, the seat is generally horizontal, and the subseat is generally horizontal and positioned beneath the seat in a first inverted orientation, and an unfolded position, in which the backrest, subseat and seat are generally horizontal, and the subseat is positioned between the backrest and the seat in a second non-inverted orientation;
• wherein the rear leg is foldable between a folded position generally parallel with the backrest when the sofa-bed is in its folded position and an unfolded position generally perpendicular to the backrest when the sofa-bed is in its unfolded position;
• and
• wherein the backrest mechanism further comprises a coupling link that is pivotally interconnected with the front swing link and the upper segment, and a brace that is pivotally interconnected with the backrest and the lower segment.

A foldable sofa-bed, comprising:

• a frame with opposed arms;
• a backrest operatively connected to the frame;
• a seat;
• a subseat hinged to the seat and pivotable relative thereto;
• and a backrest mechanism attached to the frame and to the backrest;
• wherein the frame, backrest, seat and subseat are configured to move between a folded position, in which the backrest is generally upright, the seat is generally horizontal, and the subseat is generally horizontal and positioned beneath the seat in a first inverted orientation, and an unfolded position, in which the backrest, subseat and seat are generally horizontal, and the subseat is positioned between the backrest and the seat in a second non-inverted orientation;
• and wherein the backrest mechanism includes a rear leg pivotally interconnected with the backrest and foldable between a folded position generally parallel with the backrest when the sofa-bed is in its folded position and an unfolded position generally perpendicular to and below the backrest when the sofa-bed is in its unfolded position.