Manhole lid seal

Road structure – process – or apparatus – Pavement – Vault cover-closure

Patent

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Details

52 19, 277165, 277170, E02D 2914

Patent

active

046487409

ABSTRACT:
An improved manhole seal for sealing a manhole lid to the frame. The frame has an upwardly facing ledge and an annular surface bordering the outer extremity of the ledge. The lid encloses the manhole and has a lower surface seated directly on the ledge and an outer peripheral surface abutting the annular surface of the frame. In addition, the lid is provided with an angular surface which interconnects the lower surface and the outer peripheral surface. An annular gasket seals the lid to the frame and has a generally triangular cross section. The gasket includes a first surface resting on the ledge, a second surface disposed in engagement with the annular surface of the frame and a third diagonal surface which is disposed in engagement with the angular surface on the lid. The angularity of the third surface of the gasket with respect to the horizontal, is greater than the angularity of the angular surface on the lid to provide a positive seal between the members.

REFERENCES:
patent: 3058752 (1962-10-01), Miller
patent: 3150889 (1964-09-01), Watts
patent: 3308727 (1967-03-01), Hurt, Jr.
patent: 3927891 (1975-12-01), Larker et al.

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