Pipe joints or couplings – With casing – lining or protector – Insulated
Patent
1987-06-15
1989-02-14
Callaghan, Thomas F.
Pipe joints or couplings
With casing, lining or protector
Insulated
285 53, 285179, 285915, F16L 5914
Patent
active
048042102
ABSTRACT:
A job site formed double sealed, double wall insulated spa pipe coupling is effected between two axially connected coupling components each having a plastic inner pipe and a concentric plastic outer pipe of considerably larger diameter with the pipes being connected by in situ foam insulation filing the space between the pipes. One component has the outer pipe and the foam insulation severed to expose the bare outer periphery of the inner pipe over a short length. The second component similarly formed includes a radially enlarged section over a short length to define a radially enlarged hub. An annular cylindrical collar of a length equal to the length of the hub is adhesively fixed on its inner periphery to the outer diameter of the outer pipe of the first component. The bare inner pipe is adhesively coated and fixed insertably into the interior of the radially enlarged inner pipe at said hub and an annular cylindrical coupler having a length equal to the combined axial length of the collar and the hub and having an inner diameter equal to the outer diameter of the collar and hub is adhesively sealed concentrically about the collar and hub to complete the double sealed pipe coupling.
REFERENCES:
patent: 2937662 (1960-05-01), Green
patent: 3152820 (1964-10-01), Giampa et al.
patent: 3402731 (1968-09-01), Martin
patent: 3801140 (1974-04-01), Keller
patent: 3807776 (1974-04-01), Bingham
patent: 3848904 (1974-11-01), Anderson
patent: 4441743 (1984-04-01), Steenberger
patent: 4521037 (1985-06-01), Knox
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