Fastener with fluid retention means

Claim 1

A SEPARABLE NUT ASSEMBLY HAVING AN AXIS AND ACTUABLE BY FLUID FORCES WHEREIN THE ACTUATING FLUID IS RETAINED BY THE ASSEMBLY, COMPRISING: A PLURALITY OF NUT SEGMENTS, MEANS HOLDING THE SEGMENTS TOGETHER TO FORM A NUT MEMBER HAVING AN AXIS AND AN AXIALLY-EXTENDING, INTERNALLYTHREADED PASSAGE; A REALEASE MEMBER HAVING AN AXIALLYEXTENDING INTERNAL CAVITY, AND AN OPEN END, SAID NUT MEMBER BEING AT LEAST PARTIALLY RECEIVED IN SAID CAVITY SO THAT ITS AXIS IS PARALLEL TO THAT OF THE ASSEMBLY AND HELD AGAINST DISASSEMBLY BY SAID RELEASE MEMBER AND BEING AXIALLY MOVABLE TOWARD THE OPEN END OF SAID RELEASE MEMBER, SAID RELEASE MEMBER AND SAID NUT MEMBER HAVING INTERENGAGING MEANS; AN AXIALLY-EXTENSIBLE BELLOWS IN SAID CAVITY, SAID BELLOWS COMPRISING TWO END BARRIERS AND A CONTINUOUS WALL JOINING SAID BARRIERS, THE BARRIERS AND WALL FORMING A FLUID-TIGHT ENCLOSURE, SAID BELLOWS HAVING AN AXIS PARALLEL TO THE AXIS OF THE ASSEMBLY AND ALIGNED WITH THE AXIS OF THE NUT MEMBER, THE WALL INCLUDING AT LEAST ONE CIRCUMFERENTIAL FOLD HAVING A CREST AND AN ADJACENT ROOT, THE DIAMETER OF THE CREST BEING GREATER THAN THAT OF THE ROOT WHEN THE FOLD IS CLOSED, AND THE DIFFERENCE IN DIAME-