Refrigerated display case

In a refrigerated display case having an interior cabinet and an exterior member, including a refrigerating means, a circulating means for forcing air into contact with said refrigerating means, and a passage means for directing the refrigerated air, said case defining a front opening for access to the interior thereof, at least two air inlets and corresponding outlets extending across opposed edges of said front opening, said passage means including at least inner and outer conduits communicating with the respective outlets and inlets and defining between said interior cabinet and said exterior member, said circulating means operating to drive separate air streams through said passage means and across said front opening in an innermost stream and an outermost stream, and said refrigerating means being located in said inner conduit for refrigerating the innermost stream crossing said access opening, the improvement comprising:

• a portion of said inner conduit being divided into two chambers;
• an evaporator of said refrigerating means being located within each chamber;
• and a damper device extending across the discharge openings of said two chambers for selectively controlling the opening and closing of the discharge openings, said damper device being operated by a driving device, and said damper device comprising a rectangular cross-sectional shaped case having upper and bottom openings and a shutter plate rotatably supported in said case through a support shaft, said shutter plate being selectively located to block a discharge opening from one of the chambers to prevent air circulation therethrough while allowing air circulation through the other chamber.