Pressure vessel

Claim 1

A PRESSURE VESSEL COMPRISING A RIDIG HOLLOW CONTAINER HAVING AN ENLARGED DIAMETER MOUTH AND HAVING A PORT OF THE OTHER END, A COVER MEMBER POSITIONED IN THE MOUTH OF SAID CONTAINER, SAID COVER MEMBER HAVING A PORT, MEANS SECURELY TO RETAIN SAID COVER MEMBER IN PLACE, A FLEXIBLE BLADDER OF RESILIENT DEFORMABLE MATERIAL POSITIONED IN SAID CONTAINER AND INTERVENING BETWEEN SAID PORTS, SAID BLADDER HAVING AN ENLARGED MOUTH WITH TWO SPACED ANNULAR BEADS POSITIONED ON THE INNER SIDE OF THE BLADDER AT SAID MOUTH, SAID COVER MEMBER HAVING A CYLINDRICAL PORTION EXTENDING INTO THE CONTAINER AND TRANSVERSELY SPACED THEREFROM, SAID CYLINDER PORTION HAVING AN ANNULAR GROOVE ON ITS OUTER SURFACE ACCOMMODATING THE ANNULAR BEAD MOST ADJACENT THE OPENING OF THE MOUTH OF THE BLADDER, THE WALL OF SAID ANNULAR GROOVE REMOTE FROM THE INNER END OF SAID CYLINDERICAL PORTION BEING INCLINED UPWARDLY FROM THE INNER END OF THE GROOVE TO THE OUTER PORTION THEREOF, THE ADJACENT SURFACE OF THE BEAD IN SAID GROOVE HAVING AN INHERENT INCLINATION LESS THAN THAT OF SAID INCLINED WALL, SAID FIRST BEAD HAVING A LATERALLY OUTWARDLY EXTENDING ANNULAR FLANGE ON ITS OUTER SURFACE AND THE REMAINING PORTION OF SAID BEAD BEING OF THICKNESS SUCH AS TO BE COMPRESSED LATERALLY WHEN SAID COVER MEMBER WITH THE BLADDER MOUNTED THEREON IS POSITIONED IN SAID CONTAINER, WHEREBY SAID FLANGE PORTION WILL BE UNDER GREATER COMPRESSION THAN THE REMAINING PORTION OF SAID FIRST BEAD, WITH THE LOWER EDGE OF SAID FLANGE DEFINING A RELATIVELY SHARP STEP WITH RESPECT TO THE OUTER SURFACE OF THE REMAINING PORTION OF SAID FIRST BEAD, THE DISTANCE BETWEEN SAID ANNULAR BEADS BEING INHERENTLY SUCH THAT WHEN SAID ANNULAR BEADS BEING INHERENTLY SUCH THAT OF THE EXTENDING PORTION OF SAID CYLINDRICAL PORTION WILL REACT AGAINST SAID SECOND BEAD THEREBY MAINTAINING THE PORTION OF THE BLADDER BETWEEN THE BEADS UNDER TENSION.