Method and apparatus for adjusting fiberglass manholes
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 13, 2002
Grant Date -
Nov 22, 2001
app pub date -
Feb 15, 2000
filing date -
Apr 6, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fiberglass manhole adjustment ring comprising a fiberglass pipe and a self-centering lip attached to the edge of the pipe, and a method for installing the fiberglass manhole adjustment ring in an existing fiberglass manhole. The self-centering lip can either be attached to the interior edge of the pipe to form a sleeve or to the exterior edge of the pipe to form a collar. An interior self-centering lip, or sleeve, slides into an adjoining fiberglass manhole section while an exterior self-centering lip, or collar, slides over an adjoining manhole section. The manhole adjustment ring is inserted between the cone section and barrel section of an existing fiberglass manhole to accommodate changes in elevation of the surrounding grade level. The self-centering lip may also be used on manhole sections to enable field assembly of a manhole.
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Cited Art Landscape
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