Pipe joints or couplings – With fluid pressure seal
Patent
1982-11-05
1984-10-09
Callaghan, Thomas F.
Pipe joints or couplings
With fluid pressure seal
285165, 285370, 285DIG1, F16L 2700
Patent
active
044757506
ABSTRACT:
There is provided a spherical bearing arrangement within a pipe joint between a first pipe end and a second pipe end. The pipe joint is telescoping to allow the pipe ends to move axially, rotatably and genicularly with respect to each other, and includes the plurality of contraction units located radially outwardly of the pipe ends. The contraction units are connected between the pipe ends and are supplied with fluid under pressure so that they counteract the axial separation tendency between the pipe ends when the latter are filled with a fluid under pressure. The joint includes a hollow cylinder extending between the pipe ends, and the spherical bearing is in a form of a ring member snugly but slidably surrounding each end of the hollow cylinder and mounted thereon in a liquid-tight manner. Each ring member has a male spherical surface with its center of curvature located on the axis of the cylinder, and mating with female spherical seat means on the respective pipe end. The fluid within the pipe ends has direct access to part of each ring member adjacent its respective pipe end and thus exerts a first axial force on the ring member in the direction away from the respective pipe end. Further fluid conduit means are provided from the interior of one of the pipe ends to a part of each ring member remote from its respective pipe end, and thus exerting a second axial force on the ring member in the direction toward the respective pipe end. The axial projections of the areas of the parts of the ring member subjected to these forces are such as to make the first and second axial forces substantially identical, so that the ring member is in hydraulic balance.
REFERENCES:
patent: 2545701 (1951-03-01), McCausland
patent: 3404904 (1968-10-01), Roe
patent: 3427051 (1969-02-01), White et al.
patent: 3889985 (1975-06-01), Gartmann
patent: 3938833 (1976-02-01), Miyaoka
patent: 3961815 (1976-06-01), Coulboy et al.
patent: 4317586 (1982-03-01), Campbell
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