Pipe joints or couplings – Deformed – Both members
Patent
1988-03-17
1989-08-22
Arola, Dave W.
Pipe joints or couplings
Deformed
Both members
285 94, 29520, F16L 1314
Patent
active
048589683
ABSTRACT:
A lockring tube joint is described where the end portions of a pair of interfitting tubes are joined by a lockring, wherein the lockring can be installed with less force than prior lockrings and, despite lower installation forces, the tubes are securely held together. The lockring has a front section whose internal surface is tapered, a center section with a cylindrical inner surface of the same diameter as the smallest diameter of the front section, and a rear section forming a push surface for receiving forces to push the ring onto the tubes. The center section is relatively long and thin. As the lockring is pushed onto the interfitting tubes, the front section of the lockring encounters resistance to forward movement, while the center section section of the lockring is longitudinally compressed. The longitudinally compressed center section elastically grows in diameter, which avoids high friction contact with the outermost tube. When the lockring is installed and pushing forces are no longer applied, the center section springs back to its original, smaller cylindrical shape, wherein it compresses the tubes to hold them tightly together over an appreciable length of the tubes.
REFERENCES:
patent: 2389233 (1945-11-01), Cowles
patent: 3258279 (1966-06-01), Johnsen
patent: 3498648 (1970-03-01), Hallesy
patent: 3827727 (1974-08-01), Moebius
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