Thermal chests

Claim 1

A PORTABLE CONTAINER COMPRISING THERMALLY INSULATED EXTERIOR WALLS, SAID WALLS BEING SHAPED TO DELINEATE ON THE EXTERIOR A BOTTOM SECTION RELATIVELY NARROWER THAN THE UPPER SECTION, SAID BOTTOM SECTION HAVING PORTIONS OF ITS WALLS PROTRUDING INWARDLY RELATIVE TO THE PORTIONS OF THE UPPER SECTION, SAID PROTRUDING PORTIONS FORMING A TRAY SUPPORT, A REMOVABLE TRAY MEMBER NORMALLY DISPOSED WHOLLY IN THE UPPER SECTION, AND SEATED ON SAID PROTRUDING PORTIONS, SAID TRAY BEING CONSTRUCTED OF A MATERIAL HAVING A RELATIVELY HIGH COEFFICIENT OF HEAT CONDUCTIVITY AND HAVING A HOLLOW INTERIOR ADAPTED TO RETAIN A LIQUID MATERIAL OF A RELATIVELY HIGH COEFFICIENT OF THERMAL EXCHANGE, SAID TRAY MEMBER HAVING VERTICAL SIDES FORMING AN ENCLOSURE AT THE TOP FOR OBJECTS TO BE CARRIED BY THE TRAY, SAID TRAY MEMBER HAVING A FILLING APERTURE FOR THE TRANSFER OF LIQUID INTO AND OUT OF SAID HOLLOW INTERIOR, AND A REMOVABLE CLOSURE CAP SEALING SAID APERTURE, SAID TRAY MEMBER HAVING A RECESSED SECTION ON ONE SIDE THEREOF, SAID FILLING APERTURE BEING DISPOSED IN SAID RECESSED SECTION INWARDLY OF THE OUTER BOUNDARIES OF SAID HOLLOW INTERIOR ON SAID LAST MENTIONED SIDE, WHEREBY WHEN LIQUID IS POURED INTO THE HOLLOW INTERIOR THROUGH SAID OPENING, A PORTION OF THE HOLLOW INTERIOR WILL REMAIN UNFILLED ABOVE THE MAXIMUM LIQUID LEVEL AND THEREBY PROVIDE FOR THE EXPANSION OF LIQUID WHEN SUBJECTED TO FREEZING TEMPERATURES.