Drain and inspection manhole for liquid conduits and manhole sec

Details Drain and inspection manhole for liquid conduits and manhole sec Drain and inspection manhole for liquid conduits and manhole sec

1998-10-22

2000-04-04

Lillis, Eileen Dunn

Static structures (e.g., buildings)

With entrance for persons or objects in horizontal or...

With additional enclosure structure; e.g., manhole

405 36, 405 52, 285197, 285903, 285382, E02D 2914

Patent

active

060445912

ABSTRACT:
A drain and inspection manhole for liquid conduits, in particular waste water and/or storm water drains, comprises a manhole section which is formed as a composite pipe having a smooth cylindrical internal pipe and a corrugated external pipe. The external pipe is deformed to comprise at least one connecting base with a marginal web. Apertures that are flush with each other are cut into the connecting base and the internal pipe, a connector being inserted in these apertures.

REFERENCES:
patent: 3390224 (1968-06-01), Wyatt
patent: 4089139 (1978-05-01), Moffa et al.
patent: 4286808 (1981-09-01), Fouss et al.
patent: 4570976 (1986-02-01), Othold et al.
patent: 5608998 (1997-03-01), Hume
patent: 5693347 (1997-12-01), Hegler
patent: B15320797 (1997-04-01), Hegler et al.
Copy of U.S. Application 08/797,457, Dec. 1998, now US Pat No. 5,796,635 to Hegler.
Search Report Jan. 1979 EPX.

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