# US 5,703,328 A · Cable lead-in > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,703,328 A - Document ID: US5703328A - Status: Granted - Kind: A - Application number: 08/500,949 - Filed: 1995-09-21 - Granted: 1997-12-30 - Earliest claimed: 1993-02-12 - Inventors: Olaf Johannsen - Web page: https://patentgrep.com/patent/US5703328A ## CPC - H02G 3/088: {Dustproof, splashproof, drip-proof, waterproof, or flameproof casings or inlets} - H02G 3/0658: {with means constricting the conductor-insulation (H02G3/065, H02G3/0675, H02G3/0683 take precedence)} - H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES ## Abstract A cable lead-in including an upper part and a lower part. The upper part and the lower part are clamped together by a threaded joint in an opening in a wall on a casing around current conductors, which are connected via an electric cable to other current conductors outside the casing. The upper part is formed with a through duct, which has an outer funnel-shaped duct section and an inner threaded section. A seat for a sealing ring is formed between these two sections. A nipple having a strain relief strap is screwed into the threaded section, whereby the sealing ring is pressed sealingly against both the seat and the cable. The funnel-shaped duct section serves to protect the cable against damage by bending in operation. The nipple has a hexagonal head, and at least one of a plurality of blind holes in the upper part accommodates a self-tapping screw whose head is spaced closely from one of the faces of the hexagonal nipple head. This protects the nipple against rotation, which might cause the passage of the cable through the sealing ring to become non-tight. All the components of the cable lead-in are well protected behind the wall of the casing while only a relatively low flange on the upper part is present on the outer side of the wall. In practice, this flange cannot be broken off or offer a foothold to a person who might try to stand on the flange. ## Claims ### Claim 1 A cable lead-in mounted in an opening in a wall of a casing for current conductors, the cable lead-in comprising an outer part and an inner part, said outer part including a portion passed through said opening and a through duct through which an electric cable may be run for connecting with the current conductors, and said outer part being provided with a flange which engages one side of said wall around said opening, said inner part being assembled with said outer part to clamp said outer part in the opening of said wall, said flange engaging an outer side of said wall such that only the flange is present on the outer side of the wall, a funnel being formed in at least an outermost section of said duct and converges inwardly in a direction toward an inside of the casing, and said flange having a smaller height than an axial extent of the funnel. ### Claim 2 (depends on 1) A cable lead-in according to claim 1, wherein a threaded cable clamp is arranged on an innermost side of the outer part facing the current conductors. ### Claim 3 (depends on 2) A cable lead-in according to claim 2, wherein the threaded cable clamp comprises an interiorly threaded innermost section of the outer part and a nipple to be screwed into said threaded intermost section. ### Claim 4 (depends on 2) A cable lead-in according to claim 2, wherein the threaded cable clamp moreover comprises a sealing ring for sealing the cable, and a seat for said sealing ring is provided between said outermost funnel-shaped section of the duct and said innermost threaded section, and that a nipple is adapted to press said sealing ring sealingly against both said seat and the cable when being clamped. ### Claim 5 (depends on 2) A cable lead-in according to claim 2, wherein the threaded cable clamp comprises a strain relief member, and said strain relief member is provided in a nipple section extending freely inwardly from said outer part when a nipple is screwed into it. ### Claim 6 (depends on 1) A cable lead-in according to claim 1, wherein a ratio of the axial extent of the funnel to a height of the flange is in a range between 2-7. ### Claim 7 (depends on 1) A cable lead-in according to claim 1, wherein a height of the flange is less than 10 mm. ### Claim 8 (depends on 1) A cable lead-in according to claim 1, wherein a joint between the outer part and the inner part is a threaded joint. ### Claim 9 (depends on 1) A cable lead-in according to claim 1, wherein a plurality of blind holes, which terminate in an end face of the outer part facing toward the current conductors, are provided in the outer part in a circle around its duct. ### Claim 10 (depends on 9) A cable lead-in according to claim 9, wherein at least one face extending in parallel with the axis of a nipple is provided exteriorly on a nipple section which extends freely inwardly from the outer part when the nipple is screwed into it, and at at least one of a plurality of blind holes accommodates a protruding screw or pin, said screw or pin is arranged at such a radial distance from an axis of the nipple that said at least one face abuts the screw upon rotation.