Title: Method of joining plastic pipe to other pipe

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Abstract: Method and apparatus for joinder of plastic conduit to a second conduit characterized by forming a holding means on the end of the second conduit with which the plastic conduit is to be connected, emplacing about a tubular end of plastic conduit a fitting that is adapted to be fitted against the holding means and having an interiorly protruding annular flange, or shoulder, for pulling a washer and the tubular end into sealing engagement with the end of the second conduit, heating the tubular end of the plastic conduit to its softening temperature, forming a washer on the plastic conduit such that the washer fits concentrically interiorly of the fitting, the washer having shoulders stronger than the walls of the conduit, and tightening the fitting onto the holding means with the washer disposed interiorly of the fitting and with the end of the second conduit embedded in compressed, tight, sealing relationship with the washer. In a preferred embodiment the washer is formed as a shaped piece by compressing and accordioning the heated, softened tubing walls back over and reinforcing the heating line between the heated and cold tubing wall. This preferred embodiment thereby prevents breaking of the tubing along a line of weakness adjacent the heating line.


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