Pipe joints or couplings – With casing – lining or protector – Insulated
Patent
1977-07-22
1979-04-03
Schroeder, Werner H.
Pipe joints or couplings
With casing, lining or protector
Insulated
285293, 285371, 138109, 138155, F16L 1112
Patent
active
041473817
ABSTRACT:
Two coaxial metal pipes, whose confronting extremities are each provided with a plurality of peripheral ribs of staggered height separated by two or more peripheral grooves, are interconnected by a coupling sleeve of fiber-reinforced thermosetting resin subdivided into several coaxially interleaved and independently deformable cylindrical shells each terminating in a pair of internal beads engaged in a respective peripheral pipe groove. The shells, increasing in axial tensile strength from the innermost to the outermost one, are preferably separated from one another by interposed antibonding layers of thermoplastic resin. A resinous filler can be inserted between the pipe extremities for electrically insulating them from each other. The shells of the coupling sleeve can be formed by coiling resin-coated filaments around the pipe axis, advantageously with application of an antifriction layer on each inner shell before the thermosetting material thereof has been fully hardened.
REFERENCES:
patent: 2331504 (1943-10-01), Raymond et al.
patent: 2363967 (1944-11-01), Jasper
patent: 3131725 (1964-05-01), Chyle
patent: 3432186 (1969-03-01), Braun
patent: 3905398 (1975-09-01), Johansen et al.
patent: 3993331 (1976-11-01), Schwarz
Arbes C. J.
Ross Karl F.
Schroeder Werner H.
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