Corrugated plastic pipe coupling
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United States of America Patent
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-
Oct 3, 1989
Grant Date -
N/A
app pub date -
Feb 22, 1988
filing date -
Mar 4, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A clamp-type corrugated plastic pipe coupling of the invention, which is clamped with a split mold having flanges, includes an outer coupling member having a corrugation at least on its inner surface and a packing member arranged inside the outer coupling member. The packing member has an inner surface with a corrugation substantially identical to the corrugations on outer surfaces of corruated plastic pipes to be connected. The packing member is made of a material having a rubber hardness of not more than 25 and a compression set of not more than 60%. The corrugated plastic pipe coupling having the above structure has watertightness which can sufficiently withstand a water pressure of 5 kg/cm.sup.2 or more even when it is subjected to heat cycles between -25.degree. and 80.degree. C.
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