Static structures (e.g. – buildings) – With entrance for persons or objects in horizontal or... – With additional enclosure structure; e.g. – manhole
Patent
1998-01-02
1999-05-04
Kent, Christopher
Static structures (e.g., buildings)
With entrance for persons or objects in horizontal or...
With additional enclosure structure; e.g., manhole
404 26, E02D 2914
Patent
active
058990240
ABSTRACT:
A manhole adjustment ring to be disposed in a manhole frame having a surrounding side wall structure and an inwardly depending lip on which a manhole cover is supportably disposed, the manhole adjustment ring including a base frame and a spacer ring, with the base frame having a substantially continuous, rigid, ring like configuration structured to maintain substantially continuous, mating engagement with the manhole frame, while the spacer ring is adjustably coupled to the base frame and extends upwardly therefrom to a height sufficient to extend above the surrounding side wall structure of the manhole frame and define a protruding rim that accommodates a layer of pavement in generally abutting engagement with an exterior surface thereof. The spacer ring also includes an adjustable diameter and is structured to maintain secure, adjustable, coupled engagement with the base frame, while also being structured to expand to a diameter sufficient to engage the surrounding side wall structure of the manhole frame for generally secure engagement therewith and for generally secure retention of the base frame on the manhole frame, with the manhole cover being received supportably on the spacer ring and the base frame such that an upper surface thereof is generally flush with a top of the layer of pavement disposed in abutting engagement with the exterior surface of the protruding rim of the spacer ring.
REFERENCES:
patent: 4867601 (1989-09-01), Bowman
patent: 5150984 (1992-09-01), Bowman et al.
patent: 5209601 (1993-05-01), Odill et al.
patent: 5474396 (1995-12-01), Bravo
patent: 5496128 (1996-03-01), Odill
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