Refrigeration cabinet and defrost

Claim 1

IN A REFRIGERATED ENCLOSURE HAVING AN ACCESS OPENING IN ONE WALL COMMUNICATING THE OTHERWISE ENCLOSED SPACE WITH THE AMBIENT ATMOSPHERE, AN INNER COLD AIR NOZZLE AND AN OUTER WARMER AIR NOZZLE EXTENDING IN SIDEBY-SIDE RELATIONSHIP ACROSS ONE EDGE OF SAID ACCESS OPENING, AN INNER COLD AIR INLET AND AN OUTER WARMER AIR INLET EXTENDING IN SIDE-BY-SIDE RELATIONSHIP ACROSS THE OPPOSITE EDGE OF SAID ACCESS OPENING, AN INNER COLD AIR PASSAGE COMMUNICATING THE COLD AIR INLET WITH THE COLD AIR NOZZLE, A WARMER AIR PASSAGE ADJACENT THE COLD AIR PASSAGE AND COMMUNICATING THE WARMER AIR INLET WITH THE WARMER AIR NOZZLE, CIRCULATING MEANS IN EACH OF SAID PASSAGES FOR CAUSING AIR TO FLOW FROM THE INLETS TO THE NOZZLES AND THEN AS ADJACENT INNER COLD AIR AND OUTER WARMER AIR PANELS ACROSS THE ACCESS OPENING TO THE COLD AIR INLET AND WARMER AIR INLET RESPECTIVELY FOR RECIRCULATION, A FIRST REFRIGERATION MEANS IN SAID COLD AIR PASSAGE AND A SECOND REFRIGERATION MEANS IN SAID WARM AIR PASSAGE, AND MEANS FOR DEFROSTING THE REFRIGERATION MEANS COMPRISING MEANS FOR BYPASSING THE COLD AIR STREAM FROM THE COLD AIR PASSAGE INTO THE WARMER AIR PASSAGE IN ADVANCE OF THE SECOND REFRIGERATION MEANS AND RETURNING SAID COLD AIR STREAM FROM SAID WARMER AIR PASSAGE TO SAID COLD AIR PASSAGE BEYOND THE SECOND REFRIGERATION MEANS BUT BEFORE THE COLD AIR NOZZLE AND FOR CONCURRENTLY BY-PASSING THE WARMER AIR STREAM FROM THE WARMER AIR PASSAGE TO THE VACATED PORTION OF THE COLD AIR PASSAGE IN ADVANCE OF THE FIRST REFRIGERATION MEANS AND THEN RETURNING THE WARMER AIR STREAM FROM THE COLD AIR PASSAGE TO THE WARMER AIR PASSAGE BEYOND THE FIRST REFRIGERATION MEANS BUT BEFORE THE WARMER AIR NOZZLES FOR PASSAGE OF THE WARMER AIR THROUGH THE REFRIGERATION MEANS FOR DEFROSTING.