Bushing device for introducing current conductor into compressed gas switch chambers

Claim 1

IN AN ELECTRICAL CIRCUIT BREAKER, THE COMBINATION COMPRISING A GAS-FILLED METALLIC HOUSING WITHIN WHICH THE CIRCUIT BREAKER CONTACTS ARE LOCATED, SAID HOUSING INCLUDING AN OPENING THROUGH WHICH A RIGID CONDUCTOR ROD PASSES TO THE EXTERIOR OF THE HOUSING FROM ONE OF SAID CONTACT MEMBERS, AND A BUSHING STRUCTURE SURROUNDING SAID CONDUCTOR ROD EXTERIORLY OF SAID HOUSING FOR INSULATING SAID CONDUCTOR ROD FROM SAID HOUSING, SAID BUSHING STRUCTURE COMPRISING AN OUTER HOLLOW CERAMIC INSULATOR SURROUNDING SAID CONDUCTOR ROD AND HAVING ONE END THEREOF BEARING AGAINST SAID HOUSING ADJACENT SAID OPENING, A TENSION TUBE OF INSULATING MATERIAL SURROUNDING SAID CONDUCTOR ROD AND LOCATED IN THE ANNULAR SPACE BETWEEN SAID CONDUCTOR ROD AND CERAMIC INSULATOR, MEANS ADJACENT SAID HOUSING OPENING FOR SECURING THE CORRESPONDING END OF SAID TENSION TUBE AGAINST MOVEMENT, A METALLIC TENSION SLEEVE SECURED TO SAID CONDUCTOR ROD ADJACENT THE OPPOSITE END OF SAID CERAMIC INSULATOR, MEANS SECURING THE OTHER END OF SAID TENSION TUBE TO SAID TENSION SLEEVE, A TIGHTENING NUT THREADED ONTO A THREADED PORTION OF SAID TENSION SLEEVE, AN ANNULAR FITTING MEMBER CARRIED BY AND SURROUNDING SAID TENSION SLEEVE, SAID FITTING MEMBER BEING IN CONTACT WITH SAID OPPOSITE END OF SAID CERAMIC INSULATOR AND MOVABLE AXIALLY ON SAID TENSION SLEEVE, AND SPRING MEANS SURROUNDING SAID TENSION SLEEVE AND LOCATED INTERMEDIATE SAID NUT AND SAID FITTING MEMBER FOR RESILIENTLY EXERTING A COMPRESSIVE FORCE ON SAID CERAMIC INSULATOR, SAID FORCE BEING TRANSMITTED FROM SAID NUT THROUGH SAID SPRING MEANS AND SAID FITTING MEMBER ACCOMPANIED BY A CORRESPONDING REACTIVE FORCE IN TENSION EXERTED ON SAID TENSION TUBE.