초록 ▼

An apparatus and method for forming a fusion welded butt joint between thermoplastic pipe sections. Thermoplastic tubular insert sleeves having end flanges are inserted into the ends of the pipe sections with the flanges located in abutting relation. A coupling collar mounting a heating device is sl

An apparatus and method for forming a fusion welded butt joint between thermoplastic pipe sections. Thermoplastic tubular insert sleeves having end flanges are inserted into the ends of the pipe sections with the flanges located in abutting relation. A coupling collar mounting a heating device is slid along one of the pipe sections into overlying relation with the butt joint formed by the engaged flanges. The heating device is energized to fusion weld the coupling sleeve to the pipe sections and to the flanges. The insert sleeves internally support the butt joint area of the pipe sections against thermal sagging during the fusion welding, and the flanges in their molten state tend to flow and compensate for dimensional discrepancies in the pipe sections.

대표청구항 ▼

Pipe joint apparatus for forming a fusion joint between the ends of thermoplastic pipe sections of predetermined interior and exterior diameters and having a predetermined melting temperature, said apparatus comprising: a pair of tubular plastic insert sleeves made of a thermoplastic meltable at sai

Pipe joint apparatus for forming a fusion joint between the ends of thermoplastic pipe sections of predetermined interior and exterior diameters and having a predetermined melting temperature, said apparatus comprising: a pair of tubular plastic insert sleeves made of a thermoplastic meltable at said predetermined temperature and formed with barrels to telescope in close fitting relationship within the respective pipe sections, said sleeves including radialy outwardly disposed end flanges for overlying the ends of said pipe sections and having oppositely directed first and second faces for engagement of said first faces with the ends of the pipe sections, respectively, and for abutting engagement of said second faces with each other upon arrangement of the pipe sections in axially aligned relation; and a thermoplastic tubular coupling collar having mounted in the interior surface thereof a heater for heating said ends of said pipe sections and said flanges to said predetermined temperature, said collar being adapted to telescope over the exterior of the pipe sections for disposition of said heater in coaxial relation over the abutting said second faces whereby said heating means may be energized to heat said flanges and said ends of said pipe sections to said predetermined temperature to cause flanges and pipe ends to fuse together while the barrels of said coupling sleeves remain at a temperature below said predetermined temperature and afford radial support against radial inward displacement of the wall of said pipe sections.