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US 4,896,705 AGranted
Containment manhole
AssigneeEmco Wheaton, Inc.
InventorsAlexander R. Podgers, Eric J. Butterfield
Life of this patent
Estimating the term…
Abstract
A containment manhole is formed of an upper rim and a bottom sump portion connected by an expansion joint permitting radial and axial movement of the sump portion relative to the rim. The sump portion has an integrally formed drain for the drainage of spilled product in the manhole directly into the riser. The rim also has an upstanding flange and the lid of the manhole extends over the flange with a wide, downwardly sloped skirt directing water off the lid to the outer perimeter.
Claims12
A manhole comprising:
- a manhole body having an upper rim forming the upper perimeter of the manhole, the rim having an upstanding flange and a ledge extending outwardly from the flange, the body also having an outer lip extending upwardly from the outer edge of the ledge, the body also having a trough extending radially outwardly through the lip to channel liquid on the ledge outwardly pass the lip and to reduce the accumulation of liquid on the ledge;
- and
- a lid on top of the manhole supported on the flange of the rim and covering the flange, the lid having a downwardly sloped skirt at its outer periphery, the skirt extending over the ledge to direct liquid on top of the lid downwardly toward the ledge, the skirt being vertically spaced from the ledge to minimize the contact area between the rim and the lid and to facilitate the insertion of a tool or fingers between the skirt and the ledge to remove the lid.
Dependencies are inferred from the claim text.