초록 ▼

An improvement in refrigerated display cabinets in which barrier doors and one or more guard air bands protect the primary refrigerated air band which is circulated within the cabinets during time periods when the barrier door is opened. The cabinets may be equipped with air defrost systems. When tw

An improvement in refrigerated display cabinets in which barrier doors and one or more guard air bands protect the primary refrigerated air band which is circulated within the cabinets during time periods when the barrier door is opened. The cabinets may be equipped with air defrost systems. When two guard air bands are employed, the outermost of these is directed across the outside surface of the barrier door. The air defrost system can incorporate a door opening mechanism which provides a gap between the barrier door and the access opening in order to permit ambient air through-flow for defrost purposes. Control circuitry can be controlled by opening of the barrier doors in order to actuate the guard air band movement.

대표청구항 ▼

A method of operating a refrigerated display cabinet comprising a cabinet having a display space therein, an aperture means in at least one wall thereof, the aperture means including an access opening for permitting products to be moved into and out of the display space, a first air circulating mean

A method of operating a refrigerated display cabinet comprising a cabinet having a display space therein, an aperture means in at least one wall thereof, the aperture means including an access opening for permitting products to be moved into and out of the display space, a first air circulating means for moving a primary air band within the cabinet about the display space and into contact with a refrigeration means during a refrigeration cycle, covering means for the aperture means including at least one barrier door for substantially covering a portion of the access opening, a first air band conduit arranged about the display space for containing the primary air band, the first air conduit arranged to establish a refrigerated primary air band along a path inside of the barrier door, and a second air band conduit arranged about the first air conduit for containing a secondary air band, the second air conduit arranged to establish a secondary guard air band curtain along a path contiguous to and outside of the primary air band, a second air circulating means for moving the secondary air band, and actuating means for controlling operation of the secondary air circulating means; the method comprising the steps of: operating the first air circulating means to establish a refrigerated primary air band during a refrigeration cycle of operation, operating the second air circulating means through the actuating means responsive to the opening of the barrier door to establish a secondary guard air band curtain outside of the primary air band in order to protect the primary air band from contact with ambient air when the barrier door is opened.