Manhole

Details Manhole Manhole

1998-07-27

1999-05-04

Lisenhora, James A.

Road structure, process, or apparatus

Pavement

Vault cover-closure

52 20, E02D 2914

Patent

active

058996290

ABSTRACT:
A manhole embodiment that includes a metal top ring, metal removable cover, and a flexible sheet steel skirt welded to the top ring. The skirt has a stiffening and footing flange rolled laterally inwardly or outwardly from the bottom rim of the skirt to increase the manhole lateral strength and provide a footing for the very bottom of the manhole.

REFERENCES:
patent: 4038789 (1977-08-01), Axgarde et al.
patent: 4582449 (1986-04-01), Vosswinkel
patent: 5063996 (1991-11-01), Kenner
patent: 5299884 (1994-04-01), Westhoff et al.
patent: 5785452 (1998-07-01), Milo et al.

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