Coupling fitting for connecting two pipes

Claim 2

A coupling fitting for joining two cylindrical tubes at the adjacent ends thereof, said fitting including a sleeve engaged on the end of each of said two tubes, one of said sleeves having an enlarged portion with external threads, the other of said sleeves having a flange thereon presented to abut said enlarged diameter portion of said one sleeve, an internally threaded fitting mounted over said flange and engaged with said external threaded portion to hold said enlarged portion and flange in abutment, and each of said sleeves with an initially cylindrical inner surface telescoped over each end portion of said tubes to be joined, the sleeves being formed with a plurality of axially spaced and radially thickened gripping bands initially formed on the exterior surface circumscribing the end portion of the tubes to be joined and which bands are transposable to said inner cylindrical surface to deform the outer surface configurations of the tubes, thereby leaving said sleeves with a final outer surface configuration of substantially cylindrical extent to conform to the cylindrical outer surfaces of the tubes.

Claim 3

A coupling fitting for joining two cylindrical tubes at the adjacent ends thereof, said fitting including a sleeve engaged on the end of each of said two tubes, one of said sleeves having a portion with external threads and a seal surface, the other of said sleeves having a seat thereon presented to engage with said seal surface of said one sleeve, an internally threaded fitting mounted over said seat and engaged with said external threaded portion to hold said seal surface and said seat in abutment, and radially thickened gripping bands initially formed on the exterior surface of each fitting sleeve and circumscribing the end portion of the tubes to be joined and which bands are transposable to said inner cylindrical surface to deform the outer surface configurations of the tubes, thereby leaving said sleeves with a final outer surface configuration of substantially cylindrical extent to conform to the cylindrical outer surfaces of the tubes.

Claim 4

A coupling fitting for joining two cylindrical tubes at the adjacent ends thereof, said fitting including a sleeve engaged on the end of each of said two tubes, one of said sleeves having a portion with external threads and a seal surface, the other of said sleeves having a seat thereon presented to engage with said seal surface of said one sleeve, an internally threaded fitting mounted over said seat and engaged with said external threaded portion to hold said seal surface and said seat in abutment, and radially thickened gripping bands initially formed on the exterior surface of each fitting sleeve and circumscribing the end portion of the tubes to be joined and which bands are transposable to said inner cylindrical surface to deform the outer surface configurations of the tubes, thereby leaving said sleeves with a final outer surface configuration of substantially cylindrical extent to conform to the cylindrical outer surfaces of the tubes.

Claim 5

A coupling fitting for releasably joining two pressure fluid carrying cylindrical tubes at the adjacent ends thereof, said fitting including a sleeve engaged on the end of each of said two tubes, each of said sleeves being formed with an initially cylindrical inner surface telescoped over each end portion of said tubes to be joined and with at least one radially thickened gripping band initially formed on the exterior surface circumscribing the end portion of the tubes to be joined and which bands are transposable to said inner cylindrical surface to deform the initial cylindrical outer surface configurations of the tubes, thereby leaving said sleeves with a final outer surface configuration of substantially cylindrical extent to conform to the cylindrical outer surfaces of the tubes axIally beyond said sleeves, said tubes being formed of material having greater spring-back than said sleeve material and said sleeve material being sufficiently rigid to retain the deformation and transposition of said gripping bands from the exterior thereof to said tubes, and means carried by each sleeve operable to engage each other to align said sleeves for passage of pressure fluid.

Claim 6

A coupling fitting for releasably joining two pressure fluid carrying cylindrical tubes at the adjacent ends thereof, said fitting including a sleeve engaged on the end of each of said two tubes, each of said sleeves being formed with an initially cylindrical inner surface telescoped over each end portion of said tubes to be joined and with at least one radially thickened gripping band initially formed on the exterior surface circumscribing the end portion of the tubes to be joined and which bands are transposable to said inner cylindrical surface to deform the initial cylindrical outer surface configurations of the tubes, thereby leaving said sleeves with a final outer surface configuration of substantially cylindrical extent to conform to the cylindrical outer surfaces of the tubes axIally beyond said sleeves, said tubes being formed of material having greater spring-back than said sleeve material and said sleeve material being sufficiently rigid to retain the deformation and transposition of said gripping bands from the exterior thereof to said tubes, and means carried by each sleeve operable to engage each other to align said sleeves for passage of pressure fluid.

Claim 7

In a coupling assembly to releasably connect one conduit with another, the improvement with one of the conduits to be joined having an end portion formed initially with an exterior cylindrical surface; of a coupling sleeve formed with an inner surface in faying contact with the conduit end portion and with an outer surface having at least one radially thickened and circumferentially directed gripping band radially aligned with the end portion of the conduit, said conduit being formed of material yieldable to pressure from said gripping band and having a greater spring-back than that of said coupling sleeve, whereby on connecting said sleeve and conduit end portion the initial, radially thickened portion of said sleeve is altered to a substantially uniform configuration with the adjacent portions of said sleeve and said gripping band constricts about the conduit end portion, the material of said sleeve being sufficiently rigid to retain the transposition and displacement of said gripping band, and means on said sleeve to join it to another conduit.

Claim 8

In a coupling assembly to releasably connect one conduit with another, the improvement with one of the conduits to be joined having an end portion formed initially with an exterior cylindrical surface; of a coupling sleeve formed with an inner surface in faying contact with the conduit end portion and with an outer surface having at least one radially thickened and circumferentially directed gripping band radially aligned with the end portion of the conduit, said conduit being formed of material yieldable to pressure from said gripping band and having a greater spring-back than that of said coupling sleeve, whereby on connecting said sleeve and conduit end portion the initial, radially thickened portion of said sleeve is altered to a substantially uniform configuration with the adjacent portions of said sleeve and said gripping band constricts about the conduit end portion, the material of said sleeve being sufficiently rigid to retain the transposition and displacement of said gripping band, and means on said sleeve to join it to another conduit.

Claim 9

The improvement of claim 4 in which said last means comprises a portion of said sleeve having external threads and a surface constituting a seal face.

Claim 10

The improvement of claim 4 in which said gripping band is non-circular and yields to external pressure without losing said non-circular configuration, whereby said sleeve and conduit end portion are united against relative turning.