1.furniture-bed, which being of the type comprising a hollow rectangular prismatic body as a piece of furniture itself and a folding bed that is housed inside it, being such bed associated with its lower part a rectangular panel that closes to the front of the aforementioned piece of furniture when the bed is collected, and whose panel can be considered as consisting of two parts, one of them reaching most of the length of said bed and the other covering the rest and determinative of a vertical foot when the bed is in the deployed position, the repeated bed being formed by a frame that includes two sides, a front crossbar and a rear crossbar, being mounted between said sides a plurality of slats as bed bases and having hydraulic elements for the unfolding and folding, and with the particularity that all the elements of the set are made of wood, essentially it is characterized because the area corresponding to the front part or headboard of the bed is articulated by each of its sides to the sides of the furniture, through an axis that at one end is housed in a grooved cavity in "U" > that is defined in a prismatic piece attached to a plate fixed to the internal face of each side of the piece of furniture, while the other end of that axis is through the own side of the bed and is constituted by its inner end in axis of articulation of the respective hydraulic element; it being provided that between the closing panel associated with the lower part of the bed and the slatted slats of the latter, a stringer is mounted centrally and longitudinally, which at its rear end is articulated between a pair of wings defined in a prismatic and elongated piece fixed vertically to the internal face of the determinative panel of the footboard, with the particularity that on the internal face of each of the rear ends of the sides of the other vertical piece attached to the inner face of the footboard panel and in proximity to the respective side of this, articulating in turn to the external side of this piece a stringer of smaller contour than those of the bed itself, and whose stringer of smaller contour is in a plane more external and inferior than that of the stringers of the bed, interrupting in proximity to its anterior end to save the passage of the anterior articulation axis of the bed in the folded and unfolded thereof. 2.furniture bed, according to claim 1, wherein the ends of the slats that define the mattress are housed in respective holes provided on the inner side of the sides of the bed, and supported these slats in separate stringers attached to the inner side of the discussed lateral, stringers that run between the rear ends of the hydraulic elements and an area near the rear end of the bed itself. 3.furniture bed, according to previous claims, characterized in that the closure panel of the front of the furniture has on its internal face the backing by superposition of the beams provided externally and inferiorly to the sides of the bed, as well as the central and longitudinal beam provided under slatted slats. 4. Furniture-bed, according to claim 1, characterized in that the part of the panel defining the foot and that together with the panel provided under the bed close the front opening of the furniture when said bed is collected, presents centrally and in proximity to its edge upper a pair of handles for pulling the bed assembly, each of said handles being fixed by a screw that is a cap housed in a blind hole made axially in the handle itself, with the particularity that such a sleeve presents its surface lateral striated for its immobilization inside the hole on which it is arranged. 5.furniture-bed. (Machine-translation by Google Translate, not legally binding)