Fluid coupling assembly

Claim 1

A FLUID COUPLING ASSEMBLY OF THE FEMALE TYPE FOR MAKING CONNECTION WITH AN EXTERNALLY THREADED MALE COUPLING MEMBER WITH A CONVEX SPHERICAL END SEAT AND A FLUID PASSAGE THERETHROUGH, SAID ASSEMBLY COMPRISING A SLEEVE ELEMENT HAVING ONE END CONSTRUCTED FOR ATTACHMENT TO A FLUID CONDUIT, THE OPPOSITE END PROVIDED WITH A FIRST CONCAVE SPHERICAL BEARING SURFACE FOR ENGAGING THE END SEAT ON THE MALE MEMBER, AN EXTERNAL SHOULDER, ON SAID SLEEVE ELEMENT WITH A SECOND CONVEX SPHERICAL BEARING SURFACE CONCENTRIC WITH AND FACING IN THE OPPOSITE DIRECTION WITH RESPECT TO SAID FIRST CONCAVE SPHERICAL BEARING SURFACE; AND A COUPLING NUT MOUNTED ON SAID SLEEVE ELEMENT WITH RADIAL CLEARANCE THEREBETWEEN AND WITH AN INWARDLY DIRECTED COMPLEMENTAL CONCAVE SPHERICALLY FACED FLANGE BEHIND AND ENGAGEABLE WITH SAID SECOND CONCAVE SPHERICAL BEARING SURFACE, SAID NUT BEING INTERNALLY THREADED FOR THREADEDLY ENGAGING SAID MALE MEMBER TO DRAW SAID END SEAT INTO ENGAGEMENT WITH SAID FIRST CONCAVE SPHERICAL BEARING SURFACE, THE THREADS ON THE NUT EXTENDING THROUGHOUT ITS LENGTH WITH THE EXCEPTION OF A RELATIVELY SHORT PORTION IMMEDIATELY ADJACENT SAID FLANGE WHICH PORTION IS UNDERCUT, A SEPARTE AUXILIARY THREAD BEING FORMED ON THE OUTER SURFACE OF SAID EXTERNAL SHOULDER, SAID SEPARATE THREAD HAVING A CREST DIAMETER GREATER THAN THE CREST DIAMETER OF THE THREADS ON SAID NUT, AN AXIAL LENGTH LESS THAN THE AXIAL LENGTH OF SAID UNDERCUT PORTION, AND A CONFIGURATION OPERATIVELY COMPATIBLE WITH THE THREADS ON SAID NUT.