Pipe joints or couplings – With casing – lining or protector – Insulated
Patent
1980-04-14
1981-05-26
Arola, Dave W.
Pipe joints or couplings
With casing, lining or protector
Insulated
285179, 285276, 285305, 285331, F16L 1112
Patent
active
042694361
ABSTRACT:
A joint for connecting first and second pipes, each including spaced inner and outer pipe members and a foam material filling the space between the inner and outer pipe members. The inner pipe members of the two pipes are adapted for conveying a fluid medium, the inner pipe member of the first pipe having a flared female end and the inner pipe member of the second pipe having a male end sealably inserted in the female end. The foam material in the second pipe is provided with a recess in which the first pipe extends so that the foam material in said first pipe confronts the foam material in the second pipe. The outer pipe member of the first pipe has an annular groove therein which faces outwardly and a coupling in the form of a separate tubular member secured to the second pipe or a thickened portion integral with the second pipe surrounds the outer pipe member of the first pipe and has an annular groove therein which faces inwardly and is in registry with the annular groove in the outer pipe member. A flexible key member is inserted in part in each of the grooves to lock the coupling and the first pipe in axially secured relation while permitting relative rotation therebetween. At an elbow of one of the pipes a reinforcement is provided in the form of annular rings surrounding the inner pipe member and embedded in the foam material.
REFERENCES:
patent: 3492029 (1970-01-01), French et al.
patent: 3606402 (1971-09-01), Medney
patent: 3606403 (1971-09-01), Medney
patent: 3645564 (1972-02-01), Corriston
patent: 3860742 (1975-01-01), Medney
patent: 3913954 (1975-10-01), Klimpl
patent: 4032708 (1977-06-01), Medney
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