Manhole

Details Manhole Manhole

1996-04-10

1998-07-28

Lisehora, James

Road structure, process, or apparatus

Pavement

Vault cover-closure

404 26, 52 19, 52 20, E02D 2914

Patent

active

057854521

ABSTRACT:
A manhole embodiment that includes a skirt made of flexible material, such as rolled sheet steel, having a stiffening flange extending laterally from the bottom rim of the skirt to increase the manhole lateral strength and provide a footing for the manhole and an outwardly extending lip at the skirt upper rim. The manhole top ring connects directly to the top of the lip. This eliminates the need for a separate piece such as the lower L-shaped ring piece included in conventional manholes. An optional extension skirt can telescope into the bottom of the upper skirt that can be held to the upper skirt by fasteners. The telescoping extension skirt can be height adjusted in the field so that the over-all height of the manhole can be adjusted to any desired height, say between 8 and 16 inches.

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.

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