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US 4,592,674 AGranted
Concrete manhole
OwnerMichael G. Balivainventor
Life of this patent
Estimating the term…
Abstract
A manhole barrel is cast with an annular gasket in place in the barrel form. The form has a frusto-conical pallet section grooved for receiving the gasket. Anchors protruding from the gasket become embedded in concrete when the latter is introduced into the form.
Claims9
A manhole structure having two barrels, one thereof having a male end, and the other thereof having a female end;
- said male end having an external peripheral surface, said female end having an internal peripheral surface, and said female end having said male end therein;
- said barrels being positioned vertically, one on top and one on the bottom, and there being support means for causing the weight of the top barrel to be supported by the bottom barrel, while maintaining an annular space between said surfaces;
- said space having an annular gasket therein, said gasket having resilient sealing flange means extending around said space and in sealing contact with one said peripheral surface, and said gasket having anchor means extending around said space, and being embedded in the said end having the other said peripheral surface;
- and
- said gasket having an annular seat flange extending therearound, said seat flange extending away from said space and horizontally between said barrels, and each said barrel having an annular surface sealingly contacting said seat flange.
2 more elements
A manhole structure having two barrels, one thereof having a male end, and the other therof having a female end;
- said male end having an external peripheral surface, said female end having an internal peripheral surface, said female end having said male end therein;
- said barrels being positioned vertically, one on top and one on the bottom and there being support means for causing the entire weight of the top barrel to be borne by the bottom barrel, while maintaining an annular space between said peripheral surfaces;
- said space having an annular gasket therein, said gasket having vertically-spaced resilient sealing flanges extending from said gasket and around said space and being in downwardly-deflected, circumferential sealing contact with one said peripheral surface, and said gasket having anchor means extending around said space, said anchor means being embedded in the said end having the other said peripheral surface, said flanges being at the same time out of contact, both with each other and with any gasket portions as may be adjacent said flanges.
Dependencies are inferred from the claim text.