Patent ID: 8011034
Filing Date: 2011-09-06
Classification: A47C

Abstract:
1. 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; an extension-assist mechanism attached to the frame and the subseat, wherein the extension-assist mechanism includes at least one spring, a crank that is pivotally attached with the frame and with the spring, and a drawing link that is pivotally attached to the subseat and to the crank; and a folding-assist mechanism attached to the frame at which the backrest mechanism is attached and attached to the subseat, wherein the folding-assist mechanism includes at least one spring, and an extension link pivotally attached to the subseat and to the at least one spring of the folding-assist mechanism; 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 folding-assist mechanism is configured such that the sofa-bed is biased toward the folded position as the sofa-bed moves from the unfolded position toward a first intermediate position; and wherein the extension-assist mechanism is configured such that the sofa-bed is biased toward the unfolded position as the sofa-bed moves from a second intermediate position toward the folded position.