Corrugated leaching chamber with hollow ribbing
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United States of America Patent
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Feb 10, 1998
Grant Date -
N/A
app pub date -
Mar 10, 1995
filing date -
Oct 5, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Large leaching chambers having hollow ribs are formed by gas assisted injection molding. The ribs have stepped cross sections with hollow bases and narrower solid upper parts. When the chamber wall is corrugated, as characterizes a typical arch shape cross section leaching conduit, hollow ribs on opposing sides of the wall are positioned to connect to each by means of holes in the undulating walls. Hollow ribs are narrowed along their length and where they interconnect, alleviating problems distortion and shrinkage problems. And, the chamber wall which surrounds the injection molding sprue is thinner than the typical wall, to avoid hollowing there.
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