Cooling arrangement for electrical apparatus

Claim 1

ELECTRICAL BALLAST APPARATUS COMPRISING, IN COMBINATION, A METALLIC CONTAINER, HEAT TRANSMITTING POTTING MATERIAL IN SAID CONTAINER, TRANSFORMER AND CAPACITOR DEVICES EMBEDDED LATERALLY SPACED FROM EACH OTHER IN SAID POTTING MATERIAL IN SAID CONTAINER, SAID TRANSFORMER DEVICE GENERATING SUBSTANTIAL HEAT DURING OPERATION THEREOF, AND A RECTANGULAR METALLIC TUBE MEMBER IN SAID CONTAINER SEPARATING SAID TRANSFORMER AND CAPACITOR DEVICES THEREIN AND SPACED FROM ALL THE SIDE WALLS OF SAID CONTAINER, SAID RECTANGULAR METALLIC TUBE MEMBER HAVING A VERTICALLY EXTENDING PASSAGE AND BEING OPEN AT ITS OPPOSITE ENDS TO THE EXTERIOR OF SAID CONTAINER AND BEING FLUID TIGHTLY SEALED AT SAID OPPOSITE ENDS TO THE TOP AND BOTTOM WALLS OF SAID CONTAINER, WHEREBY SAID RETANGULAR METALLIC TUBE MEMBER IS COOLED BY AIR PASSING UPWARDLY BY CONVECTION THERETHROUGH FOR COOLING THE INTERIOR OF SAID CONTAINER.