Patent ID: 6044591
Filing Date: 2000-04-04
Classification: B29L,E03F,F16L,Y10S

Abstract:
A drain and inspection manhole (32) for liquid conduits, comprisinga manhole section (11),which has a central longitudinal axis (5),which is formed as a composite pipe (1) having a smooth cylindrical internal pipe (2) and a corrugated external pipe (3),which has at least one aperture (13) in the external pipe (3) and an aperture (14), flush therewith, in the internal pipe (2), andwhich is equipped with a connector (17, 17', 17"", 17'"", 17"""") which is disposed in the aligning apertures (13, 14) and joined to the composite pipe (1) and which has a central axis (10),wherein the external pipe (3) is deformed to comprise at least one connecting base (7, 7', 7"") with a marginal web (8) which is concentric of the central axis (10), which encircles the aperture (13) in the external pipe (3) and which accommodates the connector (17, 17', 17"", 17'"", 17"""").