Cover assembly for a ground opening

Details Cover assembly for a ground opening Cover assembly for a ground opening

1989-09-25

1991-03-12

Chilcot, Jr., Richard E.

Static structures (e.g., buildings)

With entrance for persons or objects in horizontal or...

With additional enclosure structure; e.g., manhole

52 21, 404 26, E02D 2914

Patent

active

049983873

ABSTRACT:
A cover assembly for a ground opening, such as a manhole or a storm drain, is disclosed. The cover assembly includes a frame having a top, a bottom and a tubular sidewall section which is open to both the top and the bottom of the frame. An abutment portion protrudes inwardly into the tubular sidewall section adjacent its bottom. A core is slidably insertable into the tubular sidewall section of the frame so that the bottom of the core abuts against the frame abutment portion. The core includes a tubular through opening adapted to receive and support a cover such as a manhole cover or a storm drain cover across its upper end. The frame is constructed of a metallic material while the core is constructed of a non-metallic material, such as plastic, to prevent seizing.

REFERENCES:
patent: 2930295 (1960-03-01), Hale
patent: 3408778 (1968-11-01), Mason
patent: 3926533 (1975-12-01), Binette
patent: 4158515 (1979-06-01), Helms
patent: 4337005 (1982-06-01), LeBaron

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