Corrosion-proof covers for pressure vessels

Claim 1

A CORROSION-PROOF CLOSURE ASSEMBLY FOR PRESSURE VESSELS COMPRISING A COVER PROVIDED WITH A CYLINDRICALLY SHAPED HOLE THERETHROUGH, SAID HOLE HAVING AN ENLARGED CROSS-SECTION FROM A POINT INTERMEDIATE THE INNER AND OUTER SURFACES OF SAID COVER TO THE OUTER SURFACES THEREOF PROVIDING AN ANNULAR SHOULDER ON TE COVER ADJACENT THE HOLE, A CORROSION-RESISTANT PLATES ON THE INNER SURFACE OF SAID COVER PROVIDED WITH AN OPENING IN ALIGNMENT WITH SAID HOLE, A CORROSION-RESISTANT TUBULAR SOCKET SECURED TO SAID PLATE AND EXTENDING INTO SAID HOLE AND TERMINATING AT A POINT INTERMEDIATE THE SAID COVER SURFACES, THE BORE OF SAIC SOCKET REGISTERING WITH SAID OPENING IN SAID PLATE, A TUBULAR NUT MEMBER EXTENDING INTO SAID HOLE FROM THE OUTER SURFACE OF SAID COVER AND ENGAGING SAID SOCKET FOR EXERTING TENSION ON THE LATTER, SAID NUT MEMBER BEING ADAPTED TO BE SUPPORTED BY SAID SHOULDER, THE SAID COVER CLOSELY ENCLOSING SAID SOCKET AND SAID NUT MEMBER WITHIN SAID HOLE, A TUBE REMOVABLY EXTENDING THROUGH SAID NUT MEMBER AND SAID SOCKET, AN ANNULAR RIM ON THE OUTER SURFACE OF SAID TUBE, SAID NUT MEMBER AND SAID RIM BEING ADAPTED FOR SEATING THE LATTER ON THE END OF SAID SOCKET NEARER SAID OUTER COVER SURFACE, A TUBULAR SLEEVE SLIDABLY SURROUNDING SAID TUBE AND ADAPTED TO ABUT ON A SURFACE OF SAID RIM OPPOSED TO THE SURFACE THEREOF ADAPTED TO SEAT ON SAID SOCKET END, SAID SLEEVE BEING ADJUSTABLY FASTENED TO SAID COVER AT THE SAID OUTER COVER SURFACE, AND MEANS FOR CAUSING SAID SLEEVE TO BEAR ON SAID RIM.