Pressure fitting for a tube joint

Claim 1

A TUBE-TO-PIPE TYPE PRESSURE FITTING COMPRISING AN ELONGATED ONE-PIECE FITTING BODY HAVING A AXIAL BORE AND AT ONE TERMINAL END THEREOF AN ENLARGED COUNTERBORE WHICH MERGES WITH THE BORE BY WAY OF A FRUSTO-CONICAL SURFACE AT THE JUNCTURE REGION OF THE BORE AND COUNTERBORE, A TUBE SECTION HAVING A CYLINDRICAL OUTER SURFACE OF UNIFORM DIAMETER, PROJECTING THROUGH SAID COUNTERBORE, AND EXTENDING SNUGLY INTO SAID BORE, SAID FRUSTO-CONICAL SURFACE AT THE JUNCTURE REGION OF THE BORE AND COUNTERBORE HAVING A SLANT ANGLE OF THE ORDER OF 30* WITH RESPECT TO THE AXIS OF THE TUBE SECTION, SAID COUNTERBORE, IN COMBINATION WITH THE TUBE SECTION, DEFINING AN ANNULAR SOCKET SURROUNDING THE TUBE SECTION, A SOCKET-CLOSING NUT HAVING A BORE CLOSELY SURROUNDING THE TUBE SECTION AND PROVIDED WITH A CYLINDRICAL SECTION WHICH IS THREADEDLY RECEIVED IN SAID COUNTERBORE, A RESILIENT DEFORMABLE GASKET DISPOSED WITHIN SAID SOCKET AND ENCIRCLING THE TUBE SECTION, A FRUSTO-CONICAL METAL LOCKING RING FORMED OF SPRING MATERIAL, SURROUNDING SAID TUBE SECTION, DISPOSED WITHIN SAID SOCKET BETWEEN THE NUT AND THE GASKET, AND HAVING ITS SMALL BASE OF SUCH DIAMETER THAT IT WILL SEIZE SAID BITE INTO THE TUBE SECTION WHEN THE RING IS URGED TOWARDS A FLATTENED CONDITION, SAID LOCKING RING HAVING ITS SLANT ANGLE OF THE ORDER OF 60* WITH RESPECT TO THE AXIS OF THE TUBE SECTION, THE LARGE BASE OF SAID LOCKING RING BEARING AGAINST THE INNER END FACE OF THE CYLINDRICAL SECTION OF THE NUT AT THE EXTREME OUTER PERIPHERY THEREOF, SAID LARGE BASE OF THE LOCKING RING HAVING A DIAMETER APPRECIABLY LESS THAN THE DIAMETER OF SAID COUNTERBORE SO THAT AN ANNULAR CLEARANCE IS AFFORDED BETWEEN SAID LARGE BASE AND THE INNER CYLINDRICAL SURFACE OF THE COUNTERBORE, SAID INNER END FACE OF THE CYLINDRICAL SECTION OF THE NUT BEING OF FRUSTOCONICAL CONFIGURATION AND HAVING A SLANT ANGLE OF THE ORDER OF 80* WITH RESPECT TO THE AXIS OF THE TUBE SECTION SAID GASKET HAVING A CYLINDRICAL SECTION AND ALSO A FRUSTOCONICAL SECTION WHICH OPPOSES AND ABUTS FLATLY AGAINST SAID FRUSTO-CONICAL SURFACE AT THE JUNCTURE REGION OF THE BORE AND COUNTERBORE OF THE FITTING BODY, SAID GASKET ALSO HAVING THE OUTER END OF ITS CYLINDRICAL SECTION A CONCAVE FRUSTO-CONICAL END FACE DIRECTLY OPPOSING AND FITTING COEXTENSIVELY AGAINST THE CONVEX SIDE OF THE LOCKING RING AND CONTAINED ENTIRELY WITHIN THE CONFINES OF SAID FRUSTOCONICAL INNER END FACE OF THE CYLINDRICAL SECTION OF THE NUT, ALL OF THE ABOVE DEFINED ANGULAR SLOPING SURFACES AND FACES BEING SLOPED INWARDS FROM SAID TERMINAL END OF THE FITTING BODY, THE OUTER DIAMETERS OF THE CYLINDRICAL SECTION OF THE NUT, THE LOCKING RING, AND THE CYLINDRICAL SECTION OF THE GASKET BEING SUBSTANTIALLY EQUAL WHEREBY DURING PROGRESSIVE TIGHTENING OF THE NUT OF THE FULLEST EXTENT OF WHICH IT IS CAPABLE OF BEING TIGHTENED, THE LARGE BASE OF THE LOCKING RING WILL INITIALLY BE ENGAGED BY THE INNER END FACE OF THE CYLINDRICAL SECTION OF THE NUT, THE LOCKING RING WILL BE FORCED AGAINST THE GASKET, THE LATTER WILL BE PARTIALLY COMPRESSED WITHIN THE SOCKET, THE SMALL BASE OF THE LOCKING RING WILL BITE INTO THE TUBE SECTION OF LOCK THE LATER WITHIN THE FITTING BODY, AND FLEXURE OF THE LOCKING RING WILL FURTHER COMPRESS THE PERIPHERY REGION OF THE GASKET AND WILL TERMINATE SHORT OF THE FULLY FLATTENED CONDITION OF SAID LOCKING RING.