Impact protected, sealed, double-walled pipe body

Details Impact protected, sealed, double-walled pipe body Impact protected, sealed, double-walled pipe body

1990-06-04

1992-03-31

Coe, Philip R.

Pipes and tubular conduits

Combined

With end structure

138115, B29C 1100, F16L 918

Patent

active

050998889

ABSTRACT:
Plastic pipe has a cylindrical body having longitudinally extending concentric walls spaced from the longitudinal axis of the pipe. The walls are connected by ribs extending generally radially between the walls and longitudinally of the pipe. The pipe is provided with a generally annular resilient axially extending sealing ring entrapped at the end of the pipe by removing an end portion of the ribs, heating and bending an end wall portion so as to entrap a portion of the sealing ring, while permitting a second portion of the ring to axially project beyond the end of the pipe to provide impact resistance to the pipe end. A further embodiment involves omission of the sealing ring and welding the small gap remaining after heating and bending an end wall portion to seal the pipe end.

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