Transition coupling between metal and plastic piping systems
AssigneeContinental Industries, Inc.
InventorsTim F. Wood, Mike Clark
Life of this patent
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Abstract
A coupling for a transition between a plastic pipe and a metal piping system. In one embodiment, the transition coupling includes an adapter nut having a first end for connection with the metal piping system. A stiffener tube, affixed in the adapter nut, has an external diameter less than an internal diameter of the plastic pipe. An adapter coupling is connected to a second end of the adapter nut. A hollow gripper is positioned within the adapter coupling having an internal circumferential surface configured to grippingly engage the plastic pipe after axial insertion. At least one toroidal elastomeric seal is received over a groove in the stiffener tube to engage the plastic pipe.
Claims17
A transition coupling between a plastic pipe and a metal pipe system, which transition coupling comprises:
- an adapter nut having a first end for connection with said metal pipe and a second end;
- a stiffener tube fixed in said adapter nut, said stiffener tube having an external diameter slightly less than an internal diameter of said plastic pipe;
- an adapter coupling connected to said second end of said adapter nut;
- a hollow gripper positioned within said adapter coupling having an internal circumferential surface configured to grippingly engage said plastic pipe after axial insertion;
- and
- at least one toroidal elastomeric seal between said stiffener tube and said plastic pipe and having an external diameter slightly greater than an internal diameter of said plastic pipe such that it engages and forms a fluid tight seal between said stiffener tube and said plastic pipe wherein said at least one toroidal elastomeric seal engages said plastic pipe at substantially the same portion of said pipe engaged by said hollow gripper.
Dependencies are inferred from the claim text.