Manhole closure assembly
AssigneeBES, Ltd.
InventorsSamuel A. Campagna, Jr., Benjamin J. Campagna
Life of this patent
Estimating the term…
Abstract
Manhole closure assembly for preventing storm water from entering into manhole opening comprises cover section including downwardly depressed central portion. Circular mounting flange extends outwardly from depressed central portion and flange is adapted to rest upon inwardly directed manhole cover supporting flange of annular manhole frame. Downwardly depressed portion of cover section is depressed amount that exceeds path of spin of manhole cover resting upon supporting flange of annular manhole frame. First valve member is secured to cover section to relieve pressure inside manhole when pressure therein exceeds predetermined amount.
Claims10
A manhole closure assembly for preventing storm water from entering into a manhole opening in combination with an annular manhole frame and a manhole cover therefor, the closure assembly comprising a cover section including an outwardly extending circular mounting flange constructed and arranged to rest upon an inwardly directed manhole cover supporting flange of the annular manhole frame, the manhole cover normally resting upon the cover supporting flange of the annular manhole frame but having a path of spin into the manhole opening during manipulation of the cover, the cover section further including a downwardly depressed central portion extending into the manhole opening an amount that exceeds the path of spin of the manhole cover resting upon the supporting flange of the annular manhole frame whereby the depressed central portion is spaced from the path of cover spin at all locations along the surface thereof, and a first valve member secured to the cover section constructed and arranged to relieve pressure inside the manhole when the pressure therein exceeds a predetermined amount.
Dependencies are inferred from the claim text.