Hermetic cable joint

A cable joint for jointing fiber optic cables, comprising:

• a first fiber optic cable including a first insulating layer, a first conductive tube disposed within said first insulating layer, a first wire strand disposed within said first conductive tube, and a first central tube containing a plurality of first optical fibers disposed under said first wire strand;
• a second fiber optic cable including a second insulating layer, a second conductive tube disposed within said second insulating layer, a second wire strand disposed within said second conductive tube, and a second central tube containing a plurality of second optical fibers disposed under said second wire strand;
• wherein said first wire strand and said second wire strand each have an inner layer and an outer layer, said inner layer and said outer layer being of different diameters and forming a first stepped portion and a second stepped portion, respectively, said second stepped portion being of a greater diameter than said first stepped portion, said second central tube bridging said first cable and said second cable between said inner layer of said first cable and said inner layer of said second cable;
• and
• a crimp sleeve disposed over said first stepped portion and said second stepped portion of each said first cable and said second cable, said crimp sleeve tapering outwardly from a central portion of said crimp sleeve which is centrally located over said second central tube disposed between said inner layer of said first cable and said inner layer of said second cable, to two ends of said crimp sleeve, such that said two ends of said crimp sleeve have an increased diameter compared to said central portion.

A cable joint for jointing fiber optic cables, comprising:

• a first fiber optic cable including a first insulating layer, a first conductive tube disposed within said first insulating layer, a first wire strand disposed within said first conductive tube, and a first central tube containing a plurality of first optical fibers disposed under said first wire strand;
• a second fiber optic cable including a second insulating layer, a second conductive tube disposed within said second insulating layer, a second wire strand disposed within said second conductive tube, and a second central tube containing a plurality of second optical fibers disposed under said second wire strand;
• wherein said first wire strand and said second wire strand each have an inner layer and an outer layer, said inner layer and said outer layer being of different diameters and forming a first stepped portion and a second stepped portion, respectively, said second stepped portion being of a greater diameter than said first stepped portion, said second central tube bridging said first cable and said second cable between said inner layer of said first cable and said inner layer of said second cable;
• and
• a crimp sleeve having two ends, said crimp sleeve being disposed over said first stepped portion and said second stepped portion of each said first cable and said second cable, said second central tube being disposed between said inner layer of said first cable and said inner layer of said second cable;
• and
• a circumferential ring disposed at one end of said two ends of said crimp sleeve, said ring being formed integrally with and protruding from an inner surface of said crimp sleeve, said ring being disposed over said second conductive tube of said second cable and providing a hermetic seal when crimped to said second conductive tube.

A cable joint for jointing fiber optic cables, comprising:

• a first fiber optic cable including a first insulating layer, a first conductive tube disposed within said first insulating layer, a first wire strand disposed within said first conductive tube, and a first central tube containing a plurality of first optical fibers disposed under said first wire strand;
• a second fiber optic cable including a second insulating layer, a second conductive tube disposed within said second insulating layer, a second wire strand disposed within said second conductive tube, and a second central tube containing a plurality of second optical fibers disposed under said second wire strand;
• wherein said first wire strand and said second wire strand each have an inner layer and an outer layer, said inner layer and said outer layer being of different diameters and forming a first stepped portion and a second stepped portion, respectively, said second stepped portion being of a greater diameter than said first stepped portion, said second central tube bridging said first cable and said second cable between said inner layer of said first cable and said inner layer of said second cable;
• and
• a crimp sleeve having two ends, said crimp sleeve being disposed over said first stepped portion and said second stepped portion of each said first cable and said second cable, said second central tube being disposed between said inner layer of said first cable and said inner layer of said second cable;
• and
• a spring disposed over said first wire strand of said first cable, said spring having two ends and a central portion, said spring being soldered at a first end of said two ends to said first conductive tube disposed over said first wire strand of said first cable, at said central portion of said spring, and at said second end of said spring at a first end of said two ends of said crimp sleeve.

A method for making a cable joint for fiber optic cables, comprising the steps of:

• exposing a portion of a first insulation layer, a first conductive tube, a first wire strand including a first outer layer and a first inner layer, a first central tube, and first optical fibers of a first cable;
• exposing a portion of a second insulation layer, a second conductive tube, a second wire strand including a second outer layer and a second inner layer, a second central tube, and second optical fibers of a second cable;
• sliding a crimp sleeve having two ends over said first central tube and under said first wire strand;
• forming a tube joint by joining said first and second optical fibers such that said tube joint is formed under said first wire strand of said first cable;
• inserting said second wire strand into one end of said two ends of said crimp sleeve;
• inserting said first wire strand into a second end of said two ends of said crimp sleeve;
• crimping said crimp sleeve at a center portion of said crimp sleeve, said crimp being applied at each of said first inner layer and said first outer layer of said first cable, and at said second inner layer and said second outer layer of said second cable, to provide stepped portions of different diameters within said crimp sleeve.

A method for making a cable joint for fiber optic cables, comprising the steps of:

• exposing a portion of a first insulation layer, a first conductive tube, a first wire strand including a first outer layer and a first inner layer, a first central tube, and first optical fibers of a first cable;
• exposing a portion of a second insulation layer, a second conductive tube, a second wire strand including a second outer layer and a second inner layer, a second central tube, and second optical fibers of a second cable;
• pulling back the first wire strand including said first outer layer and said first inner layer;
• sliding a crimp sleeve having two ends over said first central tube and under said first wire strand;
• forming a tube joint by joining first optical fibers of said first cable and second optical fibers of said second cable, inserting a capillary tube over said first and second optical fibers, and extending said capillary tube such that said capillary tube extends between said first inner layer of said first cable and said second inner layer of said second cable, and crimping said first central tube and said second central tube to said capillary tube, such that said tube joint is formed under said first wire strand of said first cable;
• moving said crimp sleeve into position over said first wire strand and said second wire strand;
• inserting the second wire strand into one end of said two ends of said crimp sleeve;
• restoring said first inner layer and said first outer layer of said first wire strand over said first central tube;
• inserting said first wire strand into a second end of said two ends of said crimp sleeve;
• and
• crimping said crimp sleeve at a center portion of said first inner layer and said first outer layer of said first cable, at said second inner layer and said second outer layer of said second cable, and at a circumferential ring which is integral with and protrudes from an inner surface of said crimp sleeve at said second end of said two ends of said crimp sleeve, onto said second conductive tube of said second cable, to provide a hermetic seal.

A method for making a cable joint for fiber optic cables, comprising the steps of:

• exposing a portion of a first insulation layer, a first conductive tube, a first wire strand including a first outer layer and a first inner layer, a first central tube, and first optical fibers of a first cable;
• exposing a portion of a second insulation layer, a second conductive tube, a second wire strand including a second outer layer and a second inner layer, a second central tube, and second optical fibers of a second cable;
• pulling back the first wire strand including said first outer layer and said first inner layer;
• sliding a crimp sleeve having two ends over said first central tube and under said first wire strand;
• forming a tube joint by joining first optical fibers of said first cable and second optical fibers of said second cable, inserting a capillary tube over said first and second optical fibers, and extending said capillary tube such that said capillary tube extends between said first inner layer of said first cable and said second inner layer of said second cable, and crimping said first central tube and said second central tube to said capillary tube, such that said tube joint is formed under said first wire strand of said first cable;
• applying an epoxy adhesive and carbide grit to said second inner layer and said second outer layer of said second cable;
• moving said crimp sleeve into position over said first wire strand and said second wire strand;
• inserting the second wire strand into one end of said two ends of said crimp sleeve;
• restoring said first inner layer and said first outer layer of said first wire strand over said first central tube;
• applying an epoxy adhesive and carbide grit to said first inner layer and said first outer layer of said first cable;
• inserting said first wire strand into a second end of said two ends of said crimp sleeve;
• crimping said crimp sleeve at a center portion of said first inner layer and said first outer layer of said first cable, at said second inner layer and said second outer layer of said second cable, and at a circumferential ring which is integral with and protrudes from an inner surface of said crimp sleeve, at said second end of said two ends of said crimp sleeve, onto said second conductive tube of said second cable, to provide a hermetic seal;
• applying a spring around said first wire strand between said first conductive tube and said first end of said crimp sleeve;
• soldering said spring to said first conductive tube and said first end of said crimp sleeve;
• and
• molding an insulation over said crimp sleeve, said first conductive tube and said second conductive tube, said first wire strand and said spring, and amalgamating said insulation to said first insulation layer and said second insulation layer.