Plastic pipe fitting
OwnerCoyt E. Murray, Jack L. Workmaninventors
Life of this patent
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Abstract
This invention relates to a plastic pipe fitting having a connecting portion for attachment to another fitting and a joining portion to be fuse bonded to a length of pipe, whereby successive lengths of plastic pipe may be releasably connected. The connecting portion consists only of plastic suitably reinforced to increase its mechanical strength, primarily the flexural modules above the flexural modulus of the joining portion of the fitting and compatible with the flexural modulus of a mechanical couplings to provide a reliably effective connection between adjoining pipe lengths. The connecting portion of the pipe lengths desirably shaped to conform with the configuration of a conventional coupling commonly used to connect metallic pipe lengths.
Claims39
Means for connecting lengths of plastic pipe having a given flexural modulus with a mechanical coupling having a higher flexural modulus than the said given flexural modulus of the plastic pipe whereby the plastic pipe has an objectionable tendency to cold flow or move relative to the mechanical coupling responsive to changes in temperature and pressure, said means comprising a plastic pipe fitting with a joining portion extending inwardly from a first end of said plastic fitting for attachment to the length of plastic pipe and a connecting portion extending inwardly from a second end of said plastic fitting for attachment to the mechanical coupling, said first end of the fitting having a flexural modulus sufficiently the same as the said given flexural modulus of the plastic pipe to enable a reliably effective connection of the first end of the fitting to the plastic pipe as by butt fusion, and the flexural modulus of the plastic fitting gradually increasing from the first end of the fitting toward the second end of the fitting, and the connecting portion at the second end of the fitting being shaped to conform with the mechanical coupling and having a higher flexural modulus than the first end of the fitting and sufficiently the same as the flexural modulus of the mechanical coupling to enable a reliably effective connection without the said objectionable tendency to cold flow or move relative to the mechanical coupling responsive to changes in temperature and pressure.
Dependencies are inferred from the claim text.