Pipes and tubular conduits – With closures and plugs – Inflation stem type
Patent
1998-02-10
1999-09-14
Hook, James F.
Pipes and tubular conduits
With closures and plugs
Inflation stem type
138 90, 138 93, F16L 5510
Patent
active
059506792
ABSTRACT:
The present invention provides a high pressure plug coupling for providing a quick, fluid tight connection to a fluid port having internal threads. The high pressure plug coupling includes a generally hollow, exterior sleeve, with a hollow cylindrical piston slideably disposed within the exterior sleeve. A split collet assembly is connected to an end of the piston and is moveable therewith relative to the exterior sleeve. The split collet assembly includes a distal end portion that is radially expandable and contractable, with an interior surface of the distal end portion being tapered. An expansion pin is moveably disposed within the collet assembly and the piston for expanding the distal end portion. The expansion pin includes a frustum-shaped end portion adjacent to the distal end portion, with the frustum-shaped end portion being engaged with the tapered interior surface when the distal end portion is radially expanded. The frustum-shaped end portion of the expansion pin acts like a wedge, forcing the collets radially outward and into engagement with the internal threads of the fluid port. Further, since the frustum-shaped end portion is engaged with the tapered surface at the radially expanded state, the force of the pressurized fluid acting on the expansion pin is distributed between the expansion pin and the collets, thus achieving a more durable design and allowing higher pressures.
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Danielson Robert B.
Meisinger Stanlee W.
FasTest Inc.
Hook James F.
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