Wellhead constructions

Claim 1

IN A WELL APPARATUS FOR INSTALLATION AT AN UNDERWATER LOCATION, THE COMBINATION OF AN UPRIGHT LOWER METAL MEMBER HAVING AN AXIAL THROUGH BORE, A CYLINDRICAL OUTER SURFACE AND AN OUTER DOWNWARDLY DIRECTED TRANSVERSE ANNULAR LOCKING SHOULDER, A TRANSVERSE ANNULAR UPPER END FACE, AND AN UPWARDLY EXPOSED ANNULAR SEAT SPACED OUTWARDLY FROM SAID THROUGH BORE, SAID SHOULDER, SAID END FACE AND SAID SEAT BEING CONCENTRIC WITH SAID THROUGH BORE; AN UPRIGHT UPPER METAL MEMBER HAVING AN AXIAL THROUGH BORE, A TRANSVERSE ANNULAR LOWER END FACE, AND A DOWNWARDLY EXPOSED ANNULAR SEAT SPACED OUTWARDLY FROM SAID THROUGH BORE OF SAID UPPER MEMBER, SAID LOWER END FACE AND SAID DOWNWARDLY EXPOSED SEAT BEING CONCENTRIC WITH SAID THROUGH BORE OF SAID UPPER MEMBER; DEPENDENT TUBULAR MEANS RIGIDLY CARRIED BY SAID UPPER MEMBER CONCENTRIC WITH SAID THROUGH BORE THEREOF; A METAL SEALING RING; A PLURALITY OF LOCKING DEVICES CARRIED BY SAID DEPENDENT TUBULAR MEANS AND ARRANGED IN A CIRCULAR SERIES, EACH OF SAID LOCKING DEVICES HAVING AN OUTER CAM FOLLOWER PORTION AND AN INNER PORTION HAVING AN UPWARDLY EXPOSED DOWNWARDLY AND INWARDLY SLANTING SURFACE;