Corrugated plastic pipe coupling

Details Corrugated plastic pipe coupling Corrugated plastic pipe coupling

1988-02-22

1989-10-03

Callaghan, Thomas F.

Pipe joints or couplings

Packed

Sleeve

285903, F16L 2106

Patent

active

048711985

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.

REFERENCES:
patent: 2261948 (1941-11-01), Beach
patent: 3565464 (1971-02-01), Wolf
patent: 4084844 (1978-04-01), Abner
patent: 4172607 (1979-10-01), Norton
patent: 4174985 (1979-11-01), Buidry
patent: 4380348 (1983-04-01), Swartz
patent: 4491350 (1985-01-01), Wolf et al.

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