Pipe joints or couplings – With casing – lining or protector – Insulated
Patent
1988-08-03
1989-12-19
Arola, Dave W.
Pipe joints or couplings
With casing, lining or protector
Insulated
285 55, 285247, F16L 1112
Patent
active
048878472
ABSTRACT:
A metal connector for the end of an internally and externally plastics coated metal tube maintains the metal of the tube, for example aluminium, out of contact with the metal of the connector, for example brass, and thereby avoids problems of anodic corrosion. This is achieved by forming the male portion of the connector with a tapered shank over which the tube end is forced for connection, and a shoulder to act as a stop for the tube end, the shoulder being of such relatively shallow radial depth that it abuts the internal plastics coating but not the metal of the tube. In another aspect of the invention, a second shoulder radially outward of the inner shoulder abuts the outer plastics coating and the two shoulders are radially separated by a radial groove that thereby prevents contact between the end of the metal tube and the metal connector.
REFERENCES:
patent: 2805088 (1957-09-01), Cline et al.
patent: 2877027 (1959-03-01), Bagnell
patent: 4437689 (1984-03-01), Goebel et al.
Arola Dave W.
Kitechnology B.V.
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