Current limiting fuse device and corona free protective link for use therein

Claim 1

A PROTECTIVE FUSE APPARATUS FOR USE WITH A HIGH VOLTAGE BUSHING HAVING AN APERTURE EXTENDING THE LENGTH THEREOF COMPRISING, IN COMBINATION, A TUBE OF INSULATING MATERIAL HAVING AT LEAST A PORTION THEREOF DISPOSED IN SAID APERTURE, THE TUBE BEING INTERNALLY THREADED OVER A PORTION OF THE INSIDE WALL THEREOF NEAR ONE END, A HEAD MEMBER COMPOSED OF CONDUCTIVE MATERIAL DISPOSED IN SAID ONE END OF THE TUBE IN THREADED ENGAGEMENT THEREIN, THE HEAD MEMBER HAVING A STUD ELECTRODE PORTION OF A DIAMETER LESS THAN THE INSIDE DIAMETER OF THE TUBE EXTENDING THEREFROM, ELECTRICAL CONNECTING MEANS EXTENDING FROM SAID HEAD MEMBER THROUGH THE REMAINDER OF THE APERTURE IN THE BUSHING, TERMINAL MEANS MOUNTED ON THE LOWER END OF THE INSULATING TUBE AND ADAPTED TO HAVE AN ELECTRICAL CONNECTION MADE THERETO, A FUSE WIRE EXTENDING FROM THE TERMINAL MEANS THROUGH THE TUBE TO THE STUD ELECTRODE PORTION OF THE HEAD MEMBER AND MAKING ELECTRICAL CONNECTION THEREWITH, AND A COATING OF CONDUCTIVE MATERIAL ON THE INSIDE OF THE TUBE ALONG SUBSTANTIALLY THE ENTIRE LENGTH AND OVER SUBSTANTIALLY THE ENTIRE SURFACE THEREOF TO PROVIDE AN ELECTROSTATIC SHIELD, THE TERMINAL MEANS AT THE LOWER END OF THE TUBE BEING ELECTRICALLY INSULATED FROM THE COATING OF CONDUCTIVE MATERIAL, THE COATING EXTENDING TO THE END OF THE TUBE WHICH IS INTERNALLY THREADED WHEREBY THE HEAD MEMBER IS IN THREADED ENGAGEMENT WITH THE COATING, THE HEAD MEMBER HAVING A CONDUCTIVE FLANGE PORTION ADJACENT THE END OF THE TUBE, THE FLANGE PORTION HAVING