Road structure – process – or apparatus – Pavement – Vault cover-closure
Patent
1991-08-14
1993-05-11
Neuder, William P.
Road structure, process, or apparatus
Pavement
Vault cover-closure
52 20, E02B 2914
Patent
active
052096017
ABSTRACT:
A manhole grade adjusting ring has an adjustable diameter with a V-shaped expansion lock bridging the ends of the ring. The expansion lock has radial flanges which are adjustably pinned in slots in the ends of the ring after the ring is expanded or contracted to fit a particular manhole frame using an expansion/contraction tool. The "V" is then hammered to expand the diameter of the ring so as to form a tight friction fit between the ring and the manhole frame.
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"Clear-Span Manhole Adjusting Ring" literature of Cretex Specialty Products, Waukesha, Wisconsin, admitted prior art.
Anderson Ronald E.
Odill Frank J.
Cretex Companies, Inc.
Neuder William P.
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