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EP0139500A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Joint for tubular articles made of different metals

Assignee: Nagaoka Kanaami KK
•
Filing: 1984-10-03
•
Granted: —
•
Expires: 2004-10-03
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Abstract

Abstract A joint for connecting two or more tubular articles made of different metals comprises a first short pipe (2) connected to one metal tubular member and made of the same metal as the tubular member, a second short pipe (3) connected to another metal tubular member made of a metal different from the first metal tubular member, which second short pipe (3) is made of the same metal as the second tubular member and disposed to oppose the first short pipe (2) at an interval space, and an electrically insulating pipe (4) disposed between the first and second short pipes. Engaging means is provided respectively on the insulating pipe (4) and the first and second short pipes (2), (3) for engaging the insulating pipe (4) with the first and second short pipes (2), (3). The joint is capable of effectively preventing electrolytic corrosion and has a strength sufficient to withstand great external pressure, tensile and compressive loads which is likely to prevail at subterranean locations such as a deep well.

Inventors

  • 👤 Tadayoshi Nagaoka

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 02:13
CPC Classifications
F; F16; F16L; F16L13/00; F16L13/007

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 131 words
A joint for tubular articles made of different metals comprising : a first short pipe connected to one metal tubular member and made of the same metal as said tubular member ; a second short pipe connected to another metal tubular member and made of the same metal as said other metal tubular member which is made of .a metal different from said one metal tubular member, said second short pipe being disposed to oppose said first short pipe at an interval space ; an insulating pipe disposed between said first and second short pipes and made of an electrically insulating material ; and engaging means provided respectively on said first and second short pipes and on said insulating pipes.for engaging said first and second short pipes with said insulating pipe.
Claim 2
Dependent Claim 131 words
A joint for tubular articles made of different metals comprising : a first short pipe connected to one metal tubular member and made of the same metal as said tubular member ; a second short pipe connected to another metal tubular member and made of the same metal as said other metal tubular member which is made of .a metal different from said one metal tubular member, said second short pipe being disposed to oppose said first short pipe at an interval space ; an insulating pipe disposed between said first and second short pipes and made of an electrically insulating material ; and engaging means provided respectively on said first and second short pipes and on said insulating pipes.for engaging said first and second short pipes with said insulating pipe.
Claim 3
Dependent Claim 26 words
A joint as defined in claim 1 wherein said insulating pipe is disposed in such a manner that it surrounds said first and second short pipes.
Claim 4
Dependent Claim 47 words
A joint as defined in claim 2 wherein said engaging means comprises fluted portions formed in said first and second short pipes and a portion of said insulating pipe whose inner face is contoured to accommodate to said fluted portions of said first and second short pipes.
Claim 5
Dependent Claim 30 words
A joint as defined in claim 3 further comprising a spacer protruding radially inwardly from said insulating pipe to fit in said first short pipe and said second short pipe.
Claim 6
Dependent Claim 31 words
A joint as defined in claim 2 wherein said engaging means comprises annular projections provided on said first and second short pipes and an annular dent formed in said insulating pipe.
Claim 7
Dependent Claim 31 words
A joint as defined in claim 2 wherein said engaging means comprises an annular projection provided on said insulating pipe and annular dent formed in said first and second short pipes.
Claim 8
Dependent Claim 72 words
A joint as defined in claim 1 wherein said insulating pipe is disposed inside of said first and second short pipes and has the same outer diameter as said first and second short pipes at said interval space between said first and second short pipes and wherein said engaging means comprises projections provided at opposing end portions of said first and second short pipes and corresponding recesses formed in said insulating pipe.

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