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A conduit consisting of a metal tube, with or without a plastic tube liner, is rendered strain accommodating by securing to its ends fittings that have a first component part to one end of which is joined the usual male or female coupling means or other connector means and to the other end of which

A conduit consisting of a metal tube, with or without a plastic tube liner, is rendered strain accommodating by securing to its ends fittings that have a first component part to one end of which is joined the usual male or female coupling means or other connector means and to the other end of which is joined a sleeve which, in turn, is connected either directly or through another component part to the metal tube end. Said sleeve is joined to the component part or parts with provision for limited axial and angular movement and a fluid-tight seal therebetween. The plastic lining tube when present may be independently connected to the first component part with a fluid-tight seal or may pass therethrough. Alternatively, a short section of plastic tubing is connected with fluid-tight seals between the two component parts when present or between the first component part and the sleeve. Thereby, the fittings can move through a restricted range relative to the metal tube while the plastic liner or tube section elastically accommodates such movement and fluid integrity is maintained independently by both the plastic and metal tubes.

대표청구항 ▼

1. A fitting for a fluid conduit assembly in which the conduit includes at least a fluid impervious solid metallic tube, said fitting comprising a component part having at one of its ends means for connecting said fitting to another element, additional means located at the other end of said componen

1. A fitting for a fluid conduit assembly in which the conduit includes at least a fluid impervious solid metallic tube, said fitting comprising a component part having at one of its ends means for connecting said fitting to another element, additional means located at the other end of said component part for attachment to an end of said metallic tube with a fluid-tight connection, means joining said additional means to said component part with provision for limited movement at least axially between said additional means and said component part, and means for independently attaching the interior of said component part with a fluid-tight seal to an end of a non-metallic fluid impervious tube where said non-metallic tube is sized to make a substantially snug fit within said additional means and projects therefrom into said component part, said component part and said additional means interfitting telescopingly and being configured such as to restrict, over the range of movement therebetween, the gap therebetween that is bridged by said non-metallic tube to prevent said non-metallic tube from being pinched in or extruded into said gap. 2. A fitting according to claim 1, wherein said means possessed by said component part for connecting said fitting to another element comprises a fitting end constructed and arranged to be attached to another metallic tube by brazing or the like. 3. A fitting according to claim 1, wherein said additional means comprises a metallic sleeve disposed with a loose sliding fit within a bore passing through said component part, and fluid sealing means disposed between said sleeve and said component part. 4. A fitting according to claim 3, wherein said metallic sleeve has an end facing outwardly from said bore which end is constructed and arranged to be attached to said metallic tube by brazing or the like. 5. A fitting according to claim 4, wherein said means posssessed by said component part for connecting said fitting to another element comprises a fitting end constructed and arranged to be attached to another metallic tube by brazing or the like. 6. A fitting according to claim 3, wherein said additional means further comprises a second component part having a bore passing therethrough, said metallic sleeve has an end facing outwardly from the bore in said first component part which end is disposed with a loose sliding fit within said bore of the second component part, means are provided interconnecting said end of said sleeve with said second component part for limiting the movement therebetween, fluid sealing means are disposed between said sleeve and said second component part, and said second component part at its end remote from said sleeve is provided with means for attaching said second component part to the end of said metallic tube with a fluid-tight connection. 7. A fitting according to claim 3, wherein a section of non-metallic fluid impervious tubing is disposed within both said metallic sleeve and said component part with one end of said tubing secured to the interior of said component part by said means for attaching said component part thereto, and said metallic sleeve is provided with means attaching to its interior with a fluid-tight seal the opposite end of said non-metallic tubing. 8. A fitting according to claim 7, wherein said metallic sleeve has an end facing outwardly from said bore which end is constructed and arranged to be attached to said metallic tube by brazing or the like. 9. A fluid conduit assembly comprising a fluid impervious solid metallic tube, at least one end of said tube having an end fitting secured thereto, said fitting having first and second parts, said first part having means at one of its ends for connecting said fitting to another element, the other end of said first part having said second part joined thereto with provision for limited movement at least axially between said parts, said second part having a portion away from said first part which portion is attached to an end of said metallic tube, a section of non-metallic fluid impervious tubing disposed within both of said parts and sized to make a substantially snug fit within said second part, and separate means securing the respective ends of said section of non-metallic tubing with an individual fluid-tight seal to the interior of said first and second part, respectively, said first and second part interfitting telescopingly and being configured such as to restrict, over the range of movement therebetween, the gap therebetween that is bridged by said non-metallic tubing to prevent said non-metallic tubing from being pinched in or extruded into said gap. 10. A fluid conduit assembly according to claim 9, wherein said second part fits within said first part with fluid sealing means disposed therebetween, and both said fluid sealing means and said non-metallic tubing are constructed and arranged to permit both axial and angular movement of limited extent between said parts. 11. A fluid conduit assembly according to claim 10, wherein said non-metallic tubing is fabricated from a fluorocarbon resin and its ends are squeezed between the interior wall of the corresponding part and a respective concentric radially expanded insert. 12. A fluid conduit assembly according to claim 11, wherein said second part is joined to said solid tube by brazing or the like. 13. A fluid conduit assembly according to claim 9, wherein said another element is another fluid impervious solid metallic tube, and said means possessed by said first part for connecting said fitting to said element is attached to an end of said another metallic tube. 14. A fitting for a fluid conduit assembly, said fitting comprising a first part having means at one of its ends for connecting said fitting to another fluid conducting element, a second part located at the other end of said first part for attachment to a further fluid conducting element, said second part being disposed telescopingly with provision for limited movement at least axially relative to said first part, and means for independently attaching the interior of said first part with a fluid-tight seal to an end of a non-metallic fluid impervious tube where said non-metallic tube is sized to make a substantially snug fit within said second part and projects therefrom into said first part, said first and second part being configured such as to restrict, over the range of movement therebetween, the gap therebetween that is bridged by said non-metallic tube to prevent said non-metallic tube from being pinched in or extruded into said gap. 15. A fitting for a fluid conduit assembly in which the conduit includes at least a fluid impervious solid metallic tube, said fitting comprising a component part having means at one of its ends for connecting said fitting to another element, additional means located at the other end of said component part for attachment to an end of said metallic tube with a fluid-tight connection, said additional means comprising a metallic sleeve disposed with a loose sliding fit within a bore passing through said component part, means interconnecting said sleeve with said component part for providing limited movement at least axially therebetween and comprising an annular member disposed within confronting grooves, one groove being on the inside of said bore and the other groove being on the outside of said sleeve with at least one of said grooves having a greater dimension in the direction axially of said component part than said annular member whereby limited axial movement is permitted between said sleeve and said component part, fluid sealing means disposed between said sleeve and said component part, and means for independently attaching the interior of said component part with a fluid-tight seal to an end of a non-metallic fluid impervious tube where said non-metallic tube is sized to make a substantially snug fit within said metallic sleeve and projects therefrom into said component part. 16. A fitting according to claim 15, wherein said fluid sealing means comprises an elastomeric O-ring. 17. A fitting according to claim 15, wherein said metallic sleeve has an end facing outwardly from said bore which end is constructed and arranged to be attached to said metallic tube by brazing or the like. 18. A fitting according to claim 17, wherein said outwardly facing end of said sleeve is constructed and arranged to project from said component part, and indicia means are provided on said sleeve near said projecting end for indicating proper installation when a conduit assembly with said fitting attached is installed between two substantially fixed connecting points. 19. A fitting according to claim 15, wherein said means possessed by said component part for connecting said fitting to another element comprises a fitting end constructed and arranged to be attached to another metallic tube by brazing or the like. 20. A fitting according to claim 15, wherein a section of a non-metallic fluid impervious tube is disposed within both said metallic sleeve and said component part with one end of said tube secured to the interior of said component part by said means for attaching said component part thereto, and said metallic sleeve is provided with means attaching to its interior with a fluid-tight seal the opposite end of said non-metallic tube. 21. A fitting according to claim 15, wherein said metallic sleeve has an end facing outwardly from said bore which end is constructed and arranged to be attached to said metallic tube and to project from said component part, and indicia means are provided on said sleeve near said projecting end for indicating proper installation when a conduit assembly with said fitting attached is installed between two substantially fixed connecting points. 22. A fitting for a fluid conduit assembly in which the conduit includes at least a fluid impervious solid metallic tube, said fitting comprising a component part having means at one of its ends for connecting said fitting to another element, additional means located at the other end of said component part for attachment to an end of said metallic tube with a fluid-tight connection, said additional means comprising a metallic sleeve disposed with a loose sliding fit within a bore passing through said component part and having an end facing outwardly from said bore which end is constructed and arranged to be attached to said metallic tube and to project from said component part, indicia means provided on said sleeve near said projecting end for indicating proper installation when a conduit assembly with said fitting attached is installed between two substantially fixed connecting points, means interconnecting said sleeve with said component part for limited movement at least axially therebetween, fluid sealing means disposed between said sleeve and said component part, and means for independently attaching the interior of said component part with a fluid-tight seal to an end of a non-metallic fluid impervious tube where said non-metallic tube is sized to make a substantially snug fit within said metallic sleeve and projects therefrom into said component part. 23. A fitting according to claim 22, wherein said outwardly facing end of said metallic sleeve is constructed and arranged to be attached to said metallic tube by brazing or the like. 24. A fluid conduit assembly comprising a fluid conduit with end fittings at opposite ends, said conduit including at least two snug-fitting concentric tubes each of which is independently impervious to fluid, the outermost tube being solid metallic and the innermost tube being non-metallic, and each of said end fittings has first and second component parts joined, respectively, to a different one of both of said tubes with a separate fluid-tight seal therebetween, characterized in that said first and second component parts within each of said fittings are telescopingly interfitted tubular structures interconnected by means permitting limited movement at least axially therebetween, the second component parts being axially closest to and joined to the ends of said outermost tube and the first component parts being axially furthest from said outermost tube and joined to said innermost tube and provided with means for coupling to another fluid conducting element, and said innermost tube is free from corrugations but otherwise constructed and arranged to expand and contract axially to accommodate any axial movement within either of said end fittings between its respective first and second component parts caused by axial displacement of the corresponding end of said outermost tube relative to the adjacent coupled fluid conducting element when the conduit assembly is operatively installed, said first and second component parts being configured such as to restrict, over the range of movement therebetween, the gap therebetween that is bridged by said innermost tube to prevent said innermost tube from being pinched in or extruded into said gap. 25. A fluid conduit assembly according to claim 24, further characterized in that in each said fitting its respective first and second component parts are joined by means permitting limited angular movement therebetween, and said innermost tube is constructed and arranged to accommodate any such angular movement. 26. A fluid conduit assembly according to claim 25, further characterized in that said innermost tube is fabricated from a fluorocarbon resin and its ends are squeeezed each between two concentric members of a respective one of said fittings. 27. A fluid conduit assembly according to claim 24, further characterized in that said innermost tube is fabricated from a fluorocarbon resin and its ends are squeezed each between two concentric members of a respective one of said fittings. 28. A fluid conduit assembly according to claim 24, characterized in that each of said fittings has a first component part that surrounds the corresponding end of said innermost tube that extends from the corresponding end of said outermost tube, and has a second component part that surrounds said corresponding end of the innermost tube and is disposed telescopingly within said first component part with a sliding fit and fluid sealing means therebetween permitting said limited axial movement, said second component part being joined to said corresponding end of the outermost tube. 29. A fluid conduit assembly according to claim 28, further characterized in that said second component part fits within said first component part, and said fluid sealing means is constructed and arranged, such that limited angular movement is accommodated between said two component parts. 30. A fluid conduit assembly according to claim 29, further characterized in that said innermost tube is fabricated from a fluorocarbon resin and its ends are squeezed each between two concentric members of a respective one of said fittings. 31. A fluid conduit assembly according to claim 28, further characterized in that said innermost tube is fabricated from a fluorocarbon resin and its ends are squeezed each between two concentric members of a respective one of said fittings.