Bushing

{
  "publication_number": "US6359224B1",
  "country": "US",
  "kind": "B1",
  "title": "Bushing",
  "abstract": "A bushing for leading at least one cable through an opening in a wall or the like while providing protection against electromagnetic overtension and/or interference, characterized in that said bushing comprises a sealing collar of an elastic material, which can be sealingly fitted in the opening in the wall, and which is provided with at least one through channel for sealingly leading said cable therethrough, which sealing collar is electrically conductive and which is in contact with an electrically conductive cable shield of the cable in the operative condition of the bushing.",
  "claims": [
    "1. A bushing for leading at least one cable through an opening in a wall while providing protection against electromagnetic overtension and/or interference, wherein said bushing comprises a sealing collar of an elastic material, which can be sealingly fitted in the opening in the wall, and which is provided with at least one through channel for sealingly leading said cable therethrough, which sealing collar is made of an electrically conductive material formed by adding carbon particles to a resilient sealing material, and which is in contact with an electrically conductive cable shield of the cable in the operative condition of the bushing, wherein said sealing collar comprises two shell parts whose abutting boundary surfaces extend at least substantially in an axial direction.",
    "2. A bushing according to claim 1, wherein said sealing collar abuts at least partially against the electrically conductive cable shield of the cable in the operative condition of the bushing.",
    "3. A bushing according to claim 1, wherein said sealing collar is made of rubber, to which carbon particles in the form of carbon black have been added.",
    "4. A bushing according to claim 3, wherein said rubber is EPDM rubber.",
    "5. A bushing according to claim 1, wherein said sealing collar is provided with circular internal and external ribs, which external ribs have a diameter which is larger than the inside diameter of the opening in the wall, and wherein the inside diameter of the internal ribs is at least at the most substantially the equal to the outside diameter of the cable.",
    "6. A bushing according to claim 1, wherein said sealing collar is made in one piece.",
    "7. A bushing for leading at least one cable through an opening in a wall while providing protection against electromagnetic overtension and/or interference, wherein said bushing comprises a sealing collar of an elastic material which can be sealingly fitted in the opening in the wall, and which is provided with at least one through channel for sealingly leading said cable therethrough, which sealing collar is made of an electrically conductive material formed by adding carbon particles to a resilient sealing material, and which is in contact with an electrically conductive cable shield of the cable in the operative condition of the bushing, wherein rear flanks, seen in the direction of insertion, of outer serrated ribs of the sealing collar extend in a radial direction, and inner ribs are provided in pairs in the radial area of outwardly extending tops of the outer serrated ribs.",
    "8. A bushing according to claim 7, wherein the inner ribs, seen in the direction of an axial longitudinal section, are trapezoidal.",
    "9. A bushing for leading at least one cable through an opening in a wall while providing protection against electromagnetic overtension and/or interference, wherein said bushing comprises a sealing collar of an elastic material, which can be sealingly fitted in the opening in the wall, and which is provided with at least one through channel for sealingly leading said cable therethrough, and which sealing collar is in contact with an electrically conductive cable shield of the cable in the operative condition of the bushing, wherein the sealing collar is made of rubber, to which carbon particles in the form of carbon black have been added, wherein said carbon particles have a concave, dish-like shape.",
    "10. A method for manufacturing a bushing, wherein a sealing collar is made of an electrically conductive rubber by incorporating concave, dish-like carbon particles into the rubber by means of a vulcanizing process.",
    "11. A method according to claim 10, wherein said rubber is in particular EPDM rubber."
  ],
  "description_excerpt": "This is a continuation of International Application No. PCT/NL99/00084, filed Feb. 17, 1999, which claims priority of Netherlands Patent Application No. 1008522, filed Mar. 6, 1998.\n\nThe invention relates to a bushing for leading at least one cable through an opening in a wall or the like whilst providing protection against electromagnetic overtension and/or interference.\n\nSuch a bushing is known from Dutch patent application NL 173.226. This known bushing comprises an electrically conductive wall bushing and a protective circuit against overtension incorporated therein, which comprises at least two conduction components for each supply and return cable core to be connected from outside, and which terminates in terminal connecting points for said cable cores. A cross partition connected to said wall bushing divides said components into two departments, wherein all components of the protective circuit and the terminal contact points of the supply and return cable cores are placed on an electrically insulating circuit board. Said circuit board is fitted in the cavity of said wall bushing as a prefabricated insert unit, and fixed thereto together with said cross partition.\n\nOne drawback of the known bushing is that it is not chemically resistant, fire resistant, gastight and watertight. Another drawback of the known bushing is the fact that its construction is complicated and expensive. Furthermore, this known bushing hardly offers a possibility to inspect the protective circuit in the mounted condition of the bushing.",
  "cpc": [
    "F16L 5/10",
    "H02G 3/22"
  ],
  "ipc": [
    "F16L 3/08",
    "F16L 41/08",
    "H02G 3/08",
    "H02G 3/22",
    "H04B 15/00"
  ],
  "assignees": [
    "Beele Engineering BV"
  ],
  "inventors": [
    "Johannes Alfred Beele"
  ],
  "filing_date": "2000-09-06",
  "publication_date": "2002-03-19",
  "grant_date": "2002-03-19",
  "priority_date": "1998-03-06",
  "application_number": "US-65636800-A",
  "family_id": "19766687",
  "cited_by_count": 48,
  "citations": [
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  ]
}