Refrigerator appliance comprising: - a refrigerated chamber that defines a refrigerated compartment that is open on top by means of an upper opening, - a trolley comprising a tray to support objects to be refrigerated and a lid connected to said tray, said trolley being slidingly mounted in said refrigerated chamber in such a way that said appliance can be in a closed position, wherein the lid of the trolley covers said upper opening of the refrigerated chamber, and an open position, wherein the tray is basically at the same level as said upper opening of the refrigerated chamber in order to collect objects from the tray, - a lifting system connected to said trolley in order to raise and lower the trolley, and - a refrigeration system in order to refrigerate said refrigerated compartment of the refrigerated chamber; said refrigeration system comprising a refrigeration circuit with an evaporator, said evaporator of the refrigeration system comprises a heat exchanger with finned pack, a plate heat exchanger or a boxed heat exchanger; and said refrigeration system comprises at least one fan disposed in said refrigerated compartment in the proximity of the evaporator in order to circulate a refrigerated air flow in the refrigerated compartment, characterized in that said trolley comprises sliding means that are slidingly mounted in slides that extend vertically in lateral walls of said refrigerated chamber in order to permit a guided sliding of the trolley, said lifting system comprises: - an electrical motor fixed to a bottom wall of the refrigerated chamber, - a female screw connected to said trolley, - a worm screw that extends vertically through the bottom wall of the refrigerated chamber and that is engaged in the female screw; said worm screw being actuated by said electrical motor, and wherein said trolley comprises lower lateral supports that extend in lower position from lateral edges of the tray and said sliding means are mounted in said lower lateral supports; each slide comprises a section provided with a groove where the sliding means disposed in said lower lateral supports of the trolley can slide in order to permit a guided sliding of the trolley, wherein the coupling between the sliding means of the trolley and the slides of the refrigerator chamber is based on a sliding principle, and not on a rolling principle; and said sliding means are rectangular blocks that are vertically aligned on each lower lateral support. - a refrigerated chamber that defines a refrigerated compartment that is open on top by means of an upper opening, - a trolley comprising a tray to support objects to be refrigerated and a lid connected to said tray, said trolley being slidingly mounted in said refrigerated chamber in such a way that said appliance can be in a closed position, wherein the lid of the trolley covers said upper opening of the refrigerated chamber, and an open position, wherein the tray is basically at the same level as said upper opening of the refrigerated chamber in order to collect objects from the tray, - a lifting system connected to said trolley in order to raise and lower the trolley, and - a refrigeration system in order to refrigerate said refrigerated compartment of the refrigerated chamber; said refrigeration system comprising a refrigeration circuit with an evaporator, said refrigeration system comprises at least one fan disposed in said refrigerated compartment in the proximity of the evaporator in order to circulate a refrigerated air flow in the refrigerated compartment, characterized in that said trolley comprises sliding means that are slidingly mounted in slides that extend vertically in lateral walls of said refrigerated chamber in order to permit a guided sliding of the trolley, said lifting system comprises: - an electrical motor fixed to a bottom wall of the refrigerated chamber, - a female screw connected to said trolley, - a worm screw that extends vertically through the bottom wall of the refrigerated chamber and that is engaged in the female screw; said worm screw being actuated by said electrical motor, and - an electrical motor fixed to a bottom wall of the refrigerated chamber, - a female screw connected to said trolley, - a worm screw that extends vertically through the bottom wall of the refrigerated chamber and that is engaged in the female screw; said worm screw being actuated by said electrical motor, and said trolley comprises lower lateral supports that extend in lower position from lateral edges of the tray and said sliding means are mounted in said lower lateral supports; each slide comprises a section provided with a groove where the sliding means disposed in said lower lateral supports of the trolley can slide in order to permit a guided sliding of the trolley, wherein the coupling between the sliding means of the trolley and the slides of the refrigerator chamber is based on a sliding principle, and not on a rolling principle; and said sliding means are rectangular blocks that are vertically aligned on each lower lateral support.