# US 2018/0026433 A1 · End seal for heating cable > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0026433 A1 - Document ID: US20180026433A1 - Status: Published application - Kind: A1 - Application number: 15/655,217 - Filed: 2017-07-20 - Published: 2018-01-25 - Earliest claimed: 2016-07-21 - Assignees: Heat-Line Corporation - Applicants: Heat-Line Corporation - Inventors: Lorne R. HEISE - Web page: https://patentgrep.com/patent/US20180026433A1 ## CPC - H02G 15/013: Sealing means for cable inlets (inlets for cables filled with, or surrounded by, gas or oil H02G15/32) - H01B 7/0216: {Two layers} - H01B 13/0036: {Details} - H05B 3/04: Waterproof or air-tight seals for heaters - H05B 3/56: Heating cables - H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract A method of forming an end seal on a cable is provided. The method includes providing a curable sealant in a cavity formed in a boot, inserting an end of the cable in to the cavity with the boot extending about the exterior of the cable, forcing the cable in to the curable sealant whilst inhibiting the egress of curable sealant from the boot to force the curable sealant along the interior of the cable, curing the curable sealant to provide a stable load supporting layer of sealant within the cable, and applying a crimping ring to the boot in the area of the load supporting layer to secure the boot to the cable. ## Claims ### Claim 1 A method of forming an end seal on a cable comprising the steps of providing a curable sealant in a cavity formed in a boot; inserting an end of the cable in to the cavity with the boot extending about the exterior of the cable; forcing the cable in to the curable sealant whilst inhibiting the egress of curable sealant from the boot to force the curable sealant along the interior of the cable; curing the curable sealant to provide a stable load supporting layer of sealant within the cable; and applying a mechanical retainer to the boot in the area of the load supporting layer to secure the boot to the cable ### Claim 2 (depends on 1) The method of claim 1 wherein said curable sealant is an epoxy adhesive. ### Claim 3 (depends on 1) The method of claim 1 wherein said cable has a porous layer and said step of forcing said sealant along the interior of said cable impregnates said porous layer. ### Claim 4 (depends on 3) The method of claim 3 wherein said porous layer is provided by a braided protective layer between a protective jacket of a conductive core and an exterior outer coating of the cable. ### Claim 5 (depends on 4) The method of claim 4 wherein said braided protective layer and said exterior outer coating are removed from an end of said cable and a protective layer applied to said film prior to insertion in to said boot. ### Claim 6 (depends on 1) The method of claim 1 wherein egress of sealant is inhibited by an interference fit between said cable and said boot and said step of inserting said cable includes expanding said boot about said cable. ### Claim 7 (depends on 6) The method of claim 6 wherein interference between said boot and said cable corresponds to the thickness of an exterior casing of said cable. ### Claim 8 (depends on 1) The method of claim 1 including the step of supporting said boot during insertion of said cable to inhibit radial expansion of said boot. ### Claim 9 (depends on 1) The method of claim 1 wherein said sealant does not fill said cavity prior to insertion of said cable. ### Claim 10 (depends on 1) The method of claim 1 wherein said sealant occupies between 50% and 70% of the volume of the cavity prior to insertion of said cable. ### Claim 11 A cable having an elongate body including a conductor, an exterior coating, and a porous layer between said core and said exterior coating; a boot secured to one end of said body to seal said one end of said cable, said boot having a cavity to receive said cable, a cured sealant within said cavity and extending along said porous layer between said conductor and said outer layer to provide a stable load supporting layer within said cable; and a mechanical fastener to secure said boot to said cable. ### Claim 12 (depends on 11) A cable according to claim 11 wherein said porous layer is a braided protective layer. ### Claim 13 (depends on 11) A cable according to claim 11 wherein said boot is an interference fit on said cable. ### Claim 14 (depends on 13) A cable according to claim 13 wherein said boot is pliable and stretches about said cable. ### Claim 15 (depends on 14) A cable according to claim 14 wherein the interference between said boot and said cable corresponds to the thickness of said exterior coating. ### Claim 16 (depends on 11) A cable according to claim 11 wherein said cavity is complimentary in shape to said cable. ### Claim 17 (depends on 11) A cable according to claim 11 wherein said exterior coating and said porous layer are removed from a portion of said one end of said cable and a hood extends over said portion of said cable to seal said conductor from said sealant. ### Claim 18 (depends on 11) A cable according to claim 11 wherein said boot and said sealant do not adhere to one another. ### Claim 19 (depends on 18) A cable according to claim 18 wherein said sealant is an epoxy and said boot is a thermoplastic vulcanizate. ### Claim 20 An assembly jig having a pair of jaws to grip a cable and a moveable support for a boot, said support being moveable toward said jaws to force said boot on to said cable.