A - Human Necessities – 47 – F
Patent
A - Human Necessities
47
F
62/108
A47F 3/04 (2006.01) F25D 21/12 (2006.01)
Patent
CA 1138666
MULTIBAND OPEN FRONT REFRIGERATED CASE WITH AIR DEFROST ABSTRACT OF THE DISCLOSURE An open front refrigerated display case having mechanisms for establishing an inner refrigerated air band encircling the display portion of the ease and secondary air band also encircling the display portion and being positioned outside of the inner air band. An inner air conduit passes around the cabinet of the display case and has an outlet opening at one end of the access opening in the front of the cabinet and an inlet opening at the other end of the front access opening in the cabinet. A fan circulates air through this inner air conduit with the air leaving the outlet opening and being directed toward and received by the inlet opening of the conduit, thereby establishing an inner air band along with an inner air curtain across the access opening in the front of the cabinet. An evaporator coil arranged within the inner air conduit serves to refrigerate the air passing along the inner air band during a refrigeration cycle of operation. A secondary air conduit surrounds the inner air con- duit within the cabinet and during a refrigeration cycle carries air which is cooler than ambient air, but unrefrigerated. A second fan is provided within this secondary air conduit for circulating air through the conduit and establishing secondary air band and secondary curtain across the opening in the front of the cabinet. During a defrost cycle of operation, the evaporator coil is turned off and the direction of air flow through the inner air conduit is reversed and unrefrigerated air is caused to pass through the inner air conduit, thereby serving to defrost that conduit. During the defrost operation, the air flow through the secondary air conduit is either turned off or reversed in its flow direction. -2-
354649
George H. Riches And Associates
Tyler Refrigeration Corporation
LandOfFree
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