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US 3,938,853 AGranted
Shrink-fit sleeve apparatus for drill strings
AssigneeChristensen Diamond Products Company
InventorsRainer Jurgens, Alfred Ostertag
Life of this patent
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AssigneeChristensen Diamond Products Company
InventorsRainer Jurgens, Alfred Ostertag
Estimating the term…
Sleeve apparatus for mounting on a cylindrical periphery of a drill string, or other running string, including an inner sleeve having cylindrical interior and a conical exterior disposable at any selected location along a drill string member, an outer sleeve being mounted on the inner sleeve and having an inner conical surface companion to the outer conical surface of the inner sleeve, the outer sleeve being shrink-fitted on the inner sleeve, and the latter on the cylindrical periphery of the drill string member by fluid pressure actuated hydraulic means, permitting a safe, strong interconnection between the outer sleeve, inner sleeve and the drill string member, the inner and outer sleeves being readily removable, when necessary, for relocation on the drill string or for replacement by another inner and outer sleeve combination similarly shrink-fitted onto the drill string. The outer sleeve, positioned on the drill string, may be a stabilizer sleeve, a wear protection sleeve, a reamer, and the like.
Apparatus adapted to be disposed in a bore hole, comprising a drill string member having a cylindrical exterior surface, an inner sleeve on said member and having an internal cylindrical surface conforming to the cylindrical surface of said member, said sleeve also having an external conical surface, an outer sleeve surrounding said inner sleeve and having an internal conical surface conforming to said external conical surface and in contact therewith, spaced seal means between the exterior of said inner sleeve and interior of said outer sleeve providing a confined region for tapping fluid under pressure between said sleeves, and means for conducting fluid under pressure to said confined region to expand said outer sleeve and enable said outer sleeve to be moved relatively longitudinally along said inner sleeve outer surface to shrink-fit said outer sleeve on said inner sleeve and said inner sleeve on said drill string member upon relieving of the fluid pressure.
Apparatus adapted to be mounted on a cylindrical exterior of a drill string member disposable in a bore hole, comprising an inner sleeve having an internal cylindrical surface conforming to the cylindrical surface of the drill string member and an external conical surface, an outer sleeve surrounding said inner sleeve and having an internal conical surface conforming to said external conical surface and in contact therewith, said inner sleeve having at least one split extending throughout its length, spaced seal means between the exterior of said inner sleeve and interior of said outer sleeve providing a confined region for trapping fluid under pressure between said sleeves, said seal means including longitudinally spaced circumferential portions and further including longitudinal portions adjacent said split extending between said circumferential portions, and means for conducting fluid under pressure to said confined region to expand said outer sleeve and enable said outer sleeve to be moved relatively longitudinally along said conical outer surface to shrink-fit said outer sleeve on said inner sleeve and said inner sleeve on the drill string member upon relieving of the fluid pressure.
Dependencies are inferred from the claim text.