Swivel structures for mooring buoys or the like

Claim 1

A swivel for a mooring buoy for simultaneously transferring at least two fluids to or from a vessel, comprising a swivel body fixed to the buoy and having at least two concentric duct ends extending upwardly, a swivel head having correspondingly downwardly extending duct ends mounted rotatably and in sealing engagement on the swivel body, said upwardly and downwardly extending duct ends having confronting substantially horizontal faces, at least one packing ring disposed in a circular groove in one face of each pair of confronting faces to engage the opposite said face, a bearing spaced from and concentric with said faces, said bearings comprising outer ring means fixed to said swivel body and rotatable inner ring means, antifriction means between said fixed and rotatable ring means for bearing both axial and radial loads, means for releasably securing said rotatable ring means to saId swivel head and for tightening said swivel head down on said swivel body to compress said packing rings between said pairs of confronting faces, said swivel head having a radially outwardly extending flange thereon, ring means depending from said flange and radially outwardly surrounding the outer of said two concentric duct ends of said swivel body, said flange and the last-named ring means and said inner ring means having aligned vertical openings therethrough, bolts extending downwardly through said flange and upwardly through said inner ring means in axial alignment with each other and terminating in said last-named ring means releasably to secure said inner ring means to said swivel head, said swivel body having an upwardly opening annular recess therein in which said outer and inner ring means are disposed, the outer diameter of said outer ring means being equal to the internal diameter of said annular recess, and bolt means extending upwardly through said swivel body and terminating in said outer ring means to secure said outer ring means to said swivel body.