Road structure – process – or apparatus – Pavement – Vault cover-closure
Patent
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.
Milo Joseph V.
Pettesch Martin C.
Dreyfus, Esq. Edward
Lisehora James
Universal Valve Co. Inc.
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