Method of manufacture of pipe with reinforced female end
AssigneeBilfinger Water Technologies, Inc.
InventorThomas L. Hennemann
Life of this patent
Estimating the term…
Abstract
The present invention is directed to manufacturing processes for manufacturing a single piece of thermostatic pipe from a length of pipe with a female end that is reinforced by a band of reinforcing material extending around the female end. When the pipe and a similar adjacent pipe are threaded together, the band of reinforcing material helps protect the female end against failure due to hoop stresses and/or lateral stresses. In this regard, the reinforcing material is any material with a higher resistance to hoop stresses and/or lateral stresses than the material from which the pipe is made.
Claims21
A method for manufacturing a single piece of thermoplastic pipe comprising:
- extruding said pipe into a predetermined interior diameter and exterior diameter, wherein said pipe has an outer wall comprising an interior surface and an exterior surface;
- cutting said pipe into a desired length, said length of pipe having a male end with a male leading edge and a female end with a female leading edge;
- positioning a reinforcement band circumferentially around the exterior surface of at least a portion of said female end, the reinforcement band comprising one or more edges;
- enlarging the interior and exterior diameters of said female end;
- cooling said female end of said pipe with a cooling agent;
- forming internal threads on the interior surface of said female end, wherein at least a portion of said internal threads are positioned opposite said reinforcement band;
- and,
- forming external threads on the exterior surface of said male end.
A method for manufacturing a single piece of thermoplastic pipe comprising:
- extruding said pipe into a predetermined interior diameter and exterior diameter, wherein said pipe has an outer wall comprising an interior surface and an exterior surface;
- cutting said pipe into a desired length, said length of pipe having a male end with a male leading edge and a female end with a female leading edge;
- securing a cylindrical reinforcement band circumferentially around at least a portion of the exterior surface of said female end, the cylindrical reinforcement band comprising one or more edges;
- forming internal threads on the interior surface of said female end, wherein at least a portion of said internal threads are positioned opposite said reinforcement band;
- and
- forming external threads on the exterior surface of said male end.
Dependencies are inferred from the claim text.