EP0699352B1 - Seilklemme mit einer befestigung mit reduzierter länge - Google Patents

Seilklemme mit einer befestigung mit reduzierter länge Download PDF

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Publication number
EP0699352B1
EP0699352B1 EP94909277A EP94909277A EP0699352B1 EP 0699352 B1 EP0699352 B1 EP 0699352B1 EP 94909277 A EP94909277 A EP 94909277A EP 94909277 A EP94909277 A EP 94909277A EP 0699352 B1 EP0699352 B1 EP 0699352B1
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EP
European Patent Office
Prior art keywords
cable
tail
cylindrical
clamp
opening
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Expired - Lifetime
Application number
EP94909277A
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English (en)
French (fr)
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EP0699352A1 (de
Inventor
Paul A. Cornell
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Individual
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Individual
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/38—Clamped connections, spring connections utilising a clamping member acted on by screw or nut
    • H01R4/40—Pivotable clamping member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/50—Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw

Definitions

  • the present invention relates to cable clamps, in particular for use with electrical cables of the type generally used in electrical distribution networks.
  • cables In such networks it is known that ends of cables require connection in such a way as to provide a sound mechanical and electrical link between a cable and an external bar or plate, or alternately between two or more cables.
  • Cables used in power distribution networks typically have stranded or solid cores of copper or aluminum and are generally of relatively large diameter and relatively difficult to work with.
  • cable clamps which can be used to terminate a cable, for example to a bus bar, comprising a male jaw having a tail and an integral part-cylindrical head, and a female jaw having a tail and an integral yoke which defines a part-cylindrical socket.
  • the head of the male jaw is received in the socket to permit relative pivotal movement between the jaws.
  • a cable receiving opening extends diametrically through the head, and a cable receiving opening extends radially through the yoke. These openings are aligned in an open pivotal position of the jaws to permit insertion of the cable therethrough and substantially misaligned in a closed pivotal position cf the jaws to clamp the cable.
  • the tails are clamped together to hold the jaws in the closed position.
  • This invention provides an improvement for a cable clamp of the type comprising a first jaw having a first cable clamping portion and a first tail, and a second jaw having a second cable clamping portion and a second tail, in which the first jaw is pivotably mounted to the second jaw to move between a cable receiving open position, in which a cable can be inserted between the cable clamping portions, and a cable clamping closed position, in which the cable is clamped between the cable clamping portions.
  • a first opening is provided in one of the tails
  • a raised boss is provided on the other of the tails, positioned to fit within the first opening when the jaws are in the closed position.
  • the raised boss comprises a threaded opening, and a threaded fastener is mounted in the threaded opening.
  • This threaded fastener is shaped to apply closing forces on said one of the tails as the threaded fastener is rotated into the threaded opening. These closing forces tend to move the jaws to the closed position.
  • two pairs of jaws are provided in a connector for connecting two cables together.
  • the two female jaws are formed back-to-back as an integral elongate unit, whereby the connector in use lies substantially along the longitudinal axis of two cables joined end to end.
  • This embodiment also includes two male jaws, one for engagement with each of the female jaws. Separate fastening means may be provided for each pair of jaws, or it may be arranged that a single fastening means acts to secure two or more of the pairs.
  • a short threaded fastener or bolt can be used to close the cable clamp in many applications, without the need for special tools to pre-crimp the cable in the connector before the bolt is engaged. In this way, installation is made simpler, the need for special crimping or squeezing tools is reduced or eliminated, and the profile of the closed connector is reduced.
  • This low-profile feature can eliminate protruding bolt ends when the clamp is closed, and makes it possible to use the clamp in in-line insulation equipment and in other situations. This low-profile advantage is also important in many other applications where space is limited, such as for switch gear equipment, panel boards, underground installations in insulated tubing, and the like.
  • the preferred embodiments of this invention provide the further advantage that the connector may be disconnected and re-connected as necessary.
  • Fig. 1 shows a partially sectional view of a first preferred embodiment 10 of this invention, which enables the ends of two cables 2, 2' to be electrically and mechanically connected to each other.
  • this cable clamp 10 is symmetrical, having identical gripping mechanisms at each end, although in some embodiments the ends may be configured differently, and this will be discussed in detail later.
  • Fig. 2 shows a perspective view of the first end cf the clamp 10 of Fig. 1 showing the gripping mechanism.
  • the gripping mechanism includes a male jaw or member 12 and a female jaw or member 14.
  • the male jaw 12 is shown in greater detail in Figs. 4 and 4a, and it includes a cylindrical head 16 which defines a cylindrical surface 18 centered on a cylinder axis 20 (Fig. 2).
  • a first tail 22 extends radially away from the head 16, and the male jaw 12 is symmetrical about a plane of symmetry 24 (Fig. 4) which contains the cylinder axis 20.
  • the male jaw 12 includes a first cable receiving opening 26 that, as shown in Fig. 4, is oriented at a skew angle A with respect to the first tail 22 and the plane of symmetry 24.
  • the cable receiving opening 26 is adapted to receive the terminal portion of a cable, and the opening 26 opens out at both sides of the first tail 22 at a window 28 which passes completely through the tail 22.
  • the tail 22 defines a free end 30 and a pair of spaced, parallel, opposed first surfaces 32 adjacent the free end 30. Both of these first surfaces 32 are parallel to the plane of symmetry 24.
  • a fastener receiving opening 34 extends completely through the first tail 22 and receives a fastener as described below.
  • Figs. 2, 3 and 3a provide a detailed illustration of the female jaw 14, which includes a head receiving portion or yoke 36 which is generally C-shaped and defines a part-cylindrical socket 37 sized to receive the cylindrical head 16 for rotation about the cylinder axis 20.
  • the yoke 36 is integrally connected with a second tail 38 that includes a projection 40 positioned to extend into the window 28 when the first and second tails 22, 38 are clamped together.
  • a second cable receiving opening 42 extends through the yoke 36 and is positioned to align with the opening 26 when the jaws are in a cable receiving, open position, in which the first and second tails 22, 38 are separated from one another.
  • the second tail 38 defines an intermediate portion 44, an end portion 45 and two opposed parallel second surfaces 46.
  • a threaded boss or key 48 is fixed in an opening 51 passing through the intermediate portion 44 of the second tail 38 and is aligned with the opening 34 when the first and second tails 22, 38 are clamped together, such that the opening 34 fits over the upstanding part of the boss 48.
  • the boss 48 may be extruded as a ridge on the first tail 22 and subsequently machined to final shape. In practice, this approach is presently preferred.
  • Figs. 5 and 6 show the manner in which the gripping mechanism can be closed with a fastener 52 to clamp a cable.
  • the fastener 52 clamps the first and second tails 22, 38 together to hold the jaws 12, 14 in the cable clamping, closed position.
  • the fastener 52 is initially removed and the male jaw 12 is rotated to an open position (not shown) in which the first and second tails 22, 38 are spaced one from another. Then the terminal portion 54 of a cable 2 is inserted through the cable receiving openings 26, 42 until it abuts against the extreme end of the window 28. Then the male jaw 12 is rotated toward the closed position shown in Figs. 4 and 5, and the fastener 52 is used to clamp the first and second tails 22, 38 together. This causes the projection 40 to enter the window 28 and the cable 2 to be gripped at four points as shown by the arrows in Fig. 5.
  • the jaws 12, 14 can be assembled in two different orientations to grip cables of two different diameters.
  • the male jaw 12 is in a first orientation in which the angle B separates the open and closed positions.
  • the male jaw 12 has been rotated by 180° about an axis of symmetry that is contained in the plane of symmetry 24 and is perpendicular to the cylinder axis 20. Because of the skew angle A shown in Fig. 4, in this alternate position the angular separation between the open and closed positions of the male jaw 12 is B + 2A, and thus the gripping mechanism when assembled as shown in Fig. 6 operates to grip a smaller cable.
  • the gripping mechanism functions in a similar manner to the cable clamp described in detail in the above-identified Cornell patents.
  • the fastener 52 is in the form of a bolt 52 which passes through the opening 34 in the tail 22 of the male jaw 12 to engage with the threaded hole of the boss 48.
  • a washer 53 may be included if necessary or desirable.
  • the bolt 52 should not protrude through the boss 48 in order to minimize the end-on profile of the assembled connector.
  • the tails must be closed, by some external force, sufficiently that the bolt 52 positioned through the opening 34 will reach and engage the thread of the opening of the boss 48. After such engagement the tails are closed further by tightening of the bolt.
  • the provision of the upstanding boss 48 means that, for a given length of the bolt 52, the tails do not have to be closed as much as they would be in the absence of the boss 48 before the bolt 52 engages the thread.
  • a shorter bolt 52 can be used to close the tails fully.
  • the bolt 52 can be dimensioned to prevent it from protruding through the closed tails.
  • the preferred arrangement is to provide a boss 48 which protrudes above the surface of tail 38 by an amount approximately equal to the thickness of the tail 22, and to use a bolt having a threaded shank length approximately equal to the combined thickness of the two tails.
  • the clamp 10 comprises two gripping mechanisms as described in detail with reference to Figs. 2 to 6.
  • Each of the male members may then be used in a separate one of the two orientations discussed above, whereby the connector can connect two cables of different diameters.
  • the cable receiving openings in one or both of the two gripping mechanisms may be shaped appropriately specifically for receiving and gripping one core of 119° solid sectoral cable. Such cable receiving openings are described in detail with respect to clamps in GB-A-2 287 839.
  • the cable clamp 10 provides a simple but highly effective way to connect cables. The ends of the cables simply need to be stripped of insulation, inserted into the cable receiving openings of the gripping mechanisms, and the pairs of jaws clamped together.
  • such a cable clamp should preferably be insulated in many applications. This may be done simply by winding self-amalgamating insulating tape around the assembled cable clamp. The application of such an insulating cover may be facilitated by rounding the corners of the female jaws of the connector as indicated at 62 in Figs. 2 and 3a. Such rounding of the corners also allows the clamp to fit in certain tubes and spaces limited in size by electrical codes, regulations, and usage.
  • the cable clamp of the present invention may include three or more gripping mechanisms as described above, a first jaw of each gripping mechanism being formed as an integral unit with a first jaw of the others. This enables the connection of more than two cables.
  • the jaws 12',14' form an attachment structure which attaches the jaw 14 to the cable 2'.
  • This attachment structure can take other forms, such as a further opening 70" in one of the tails of the jaws 12",14" ( Figure 7). Such a further opening may receive a fastener that secures the jaw 12",14" to a bus bar or the like.
  • the components of the cable clamp 10 are preferably manufactured from an aluminum alloy having an electrical conductivity not less than 40% of the International Annealed Copper Standard.
  • the cable receiving openings should preferably be sized approximately 110% of the largest cable to be clamped.
  • all the major components of the connector have approximately constant cross-sectional shape, they are preferably machined from extruded stock.
  • Connectors according to the preferred embodiment of the present invention are capable of handling voltages up to 132 kV.

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  • Installation Of Indoor Wiring (AREA)
  • Clamps And Clips (AREA)

Claims (15)

  1. Eine Kabelschelle, bestehend aus: einer ersten Backe, die ein erstes Kabelklemmteil und einen ersten Schwanz umfaßt;
    einer zweiten Backe, die aus einem zweiten Kabelklemmteil und einem zweiten Schwanz besteht;
    bei der besagte erste Backe gelenkig an der zweiten Backe befestigt ist, damit sie zwischen einer ersten geöffneten Stellung, in der Kabel aufgenommen wird und einer zweiten geschlossenen Stellung bewegt werden kann, in der das Kabel zwischen den zwei Kabelklemmteilen gehalten wird;
    einer ersten Öffnung in einem der Schwänze;
    einem erhobenen Ansatz am anderen Schwanz, der so ausgeführt ist, daß er in die erste Öffnung paßt, wenn sich die Backen in der geschlossenen Stellung befinden, wobei besagter erhobener Ansatz eine Gewindeöffnung umfaßt und
    einer Schraube, die in der Gewindeöffnung ausgeführt und so gebildet ist, daß Schließkräfte auf einen besagter Schwänze ausgeübt werden, wenn die Schraube in die Gewindeöffnung eingeschraubt wird, wobei besagte Schließkräfte die Backen in die geschlossene Stellung bewegen.
  2. Die Kabelschelle nach Anspruch 1, bei der der Ansatz so abgemessen ist, daß er nicht durch die Öffnung in einem der besagten Schwänze vorsteht, wenn sich besagte zweite Backe in der geschlossenen Stellung befindet.
  3. Die Kabelschelle nach Anspruch 1, bei der beide Schwänze jeweils eine gewisse Dicke aufweisen und bei der die Schraube einen Gewindeschaft mit einer Schaftlänge aufweist, die größtenteils der Gesamtdicke der ersten und zweiten Schwänze am Ansatz entspricht.
  4. Die Kabelschelle nach Anspruch 4, bei der besagter erster Schwanz eine Befestigungsstruktur aufweist und wobei die Schraube zwischen der Befestigungsstruktur und den Klemmteilen ausgeführt ist.
  5. Die Kabelschelle nach Anspruch 4, bei der die Befestigungsstruktur eine Öffnung umfaßt, die in besagtem ersten Schwanz gebildet ist.
  6. Die Kabelschelle nach Anspruch 4, bei der besagte Befestigungsstruktur aus folgendem besteht:
    einer dritten Backe, die ein drittes Kabelklemmteil und einen dritten Schwanz umfaßt;
    einem vierten Kabelklemmteil, das auf besagtem ersten Schwanz gebildet ist;
    wobei besagte Backe gelenkig auf dem vierten Kabelklemmteil gebildet ist und sich zwischen einer Kabelaufnahmestellung und einer Kabelklemmstellung, auf der ein zweites Kabel zwischen den dritten und vierten Kabelklemmteilen eingeklemmt wird, bewegen kann und
    einer zweiten Schraube, die zwischen dem dritten Schwanz und besagtem ersten Schwanz befestigt ist, um die dritte Backe in der Kabelklemmstellung zu halten.
  7. Die Kabelschelle nach Anspruch 6, bei der die zweite Schraube in einer zweiten Gewindeöffnung in einem zweiten Ansatz aufgenommen wird und wobei der zweite Ansatz in eine Öffnung im jeweiligen Schwanz verläuft, wenn sich die dritte Backe in der Kabelklemmstellung befindet.
  8. Die Kabelschelle nach Anspruch 1, bei der die erste Klemmstellung ein C-förmiges Teil umfaßt, das eine zylindrische Buchse bildet, in der die zweite Klemmstellung einen zylindrischen Kopf umfaßt, der in der zylindrischen Buchse aufgenommen wird und wobei das C-förmige Teil und der zylindrische Kopf jeweils kabelaufnehmende Öffnungen umfassen, die aufeinander abgestimmt sind, wenn sich die Backen in der geöffneten Stellung befinden und wenigstens teilweise gegeneinander verschoben sind, wenn sich die Backen in der geschlossenen Stellung befinden.
  9. Die Kabelklemme nach Anspruch 8, bei der der zylindrische Kopf eine symmetrische Ebene bildet, die durch den zweiten Schwanz und eine zylindrische Achse verläuft, die durch den zylindrischen Kopf gebildet wird, wobei die Kabelaufnahmeöffnung im zylindrischen Kopf, gegenüber der symmetrischen Ebene, in schrägem Winkel ausgerichtet ist, so daß jeder der zylindrischen Köpfe zwei Kabel unterschiedlicher Größe festklemmt, d.h. eine pro zwei möglicher Orientierungen des zylindrischen Kopfes im C-förmigen Teil.
  10. Die Kabelklemme nach Anspruch 6, bei der die ersten und vierten Klemmteile jeweils C-förmige Teile umfassen, die jeweils zylindrische Buchsen bilden, während die zweiten und dritten Klemmteile jeweils zylindrische Köpfe umfassen, die in den jeweiligen zylindrischen Buchsen aufgenommen werden und wobei die C-förmigen Teile sowie die zylindrischen Köpfe jeweils Kabelaufnahmeöffnungen beinhalten.
  11. Die Kabelschelle nach Anspruch 10, bei der die zylindrischen Köpfe jeweils symmetrische Ebenen bilden, die durch den jeweiligen Schwanz und die zylindrische Achse verlaufen, die vom jeweiligen zylindrischen Kopf gebildet werden und wobei die Kabelaufnahmeöffnungen in den zylindrischen Köpfen, gegenüber den jeweiligen symmetrischen Ebenen, in schrägem Winkel ausgerichtet sind, so daß jeder der zylindrischen Köpfe zwei Kabel unterschiedlicher Größe festklemmt, d.h. eine pro zwei möglicher Orientierungen des zylindrischen Kopfes im C-förmigen Teil.
  12. Eine inline-Kabelschelle zum Zusammenklemmen von zwei Kabeln, bestehend aus:
    einer ersten Backe mit zwei gegenüberliegenden Enden, wobei besagte erste Backe ein erstes C-förmiges Kabelklemmteil an einem Ende und ein zweites C-förmiges Kabelklemmteil am anderen Ende aufweist, wobei die ersten und zweiten Kabelklemmteile jeweils eine Kabelaufnahmeöffnung umfassen und die erste Backe auf halbem Wege zwischen den gegenüberliegenden Enden einen zentralen Abschnitt aufweist, der zwei erhobene Ansätze auf einer ersten Seite umfaßt, die jeweils eine Gewindeöffnung beinhalten;
    zweiten und dritten Backen, die je einen Schwanz und je einen zylindrischen Kopf umfassen, wobei jeder der Köpfe eine Kabelaufnahmeöffnung beinhaltet und, gegenüber einer der C-förmigen Kabelklemmteile gelenkig ausgeführt ist, um eine Bewegung zwischen einer Kabelaufnahmestellung, auf der sich der jeweilige Schwanz im Abstand zur ersten Seite befindet und einer Kabelklemmstellung, in der sich der jeweilige Schwanz auf der ersten Seite befindet, zu ermöglichen;
    jeder der Schwänze beinhaltet eine Öffnung, die zur Aufnahme des jeweiligen Ansatzes abgemessen ist, wenn sich der jeweilige Kopf in der Kabelklemmstellung befindet und
    erste und zweite Schrauben, die jeweils in eine der Gewindeöffnungen eingreifen, um auf den jeweiligen Schwanz einzuwirken, damit Schließkräfte angesetzt werden, wenn die Schraube in die Gewindeöffnung gedreht wird. Besagte Schließkräfte führen zum Bewegen der Köpfe in die Kabelklemmstellung.
  13. Die Kabelschelle nach Anspruch 12, bei der die Ansätze nicht zum Vorstehen durch die Öffnungen in den Schwänzen abgemessen sind, wenn sich die zylindrischen Köpfe in der Kabelklemmstellung befinden.
  14. Die Kabelschelle nach Anspruch 13, bei der die Schrauben nicht zum Vorstehen durch die Gewindeöffnungen abgemessen sind, wenn sich die zylindrischen Köpfe in der Kabelklemmstellung befinden.
  15. Die inline-Kabelschelle nach Anspruch 14, bei der die zylindrischen Köpfe jeweils eine symmetrische Ebene bilden, die durch eine Zylinderachse verläuft, die durch den jeweiligen zylindrischen Kopf und den jeweiligen Schwanz gebildet wird, wobei die das Kabel aufnehmenden Öffnungen in den Zylinderköpfen, gegenüber den jeweiligen symmetrischen Ebenen, im schrägen Winkel orientiert sind, so daß jeder der zylindrischen Köpfe zwei Kabel unterschiedlicher Größe festklemmt, d.h. jeweils ein Kabel für die zwei möglichen Orientierungen des jeweiligen zylindrischen Kopfes im zutreffenden C-förmigen Kabelklemmteil.
EP94909277A 1994-03-16 1994-03-16 Seilklemme mit einer befestigung mit reduzierter länge Expired - Lifetime EP0699352B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB1994/000050 WO1995025361A1 (en) 1994-03-16 1994-03-16 Cable clamp with reduced fastener length

Publications (2)

Publication Number Publication Date
EP0699352A1 EP0699352A1 (de) 1996-03-06
EP0699352B1 true EP0699352B1 (de) 1997-07-23

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EP94909277A Expired - Lifetime EP0699352B1 (de) 1994-03-16 1994-03-16 Seilklemme mit einer befestigung mit reduzierter länge

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EP (1) EP0699352B1 (de)
JP (1) JPH08510595A (de)
DE (1) DE69404462T2 (de)
DK (1) DK0699352T3 (de)
WO (1) WO1995025361A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6772868B2 (en) 2001-09-13 2004-08-10 Pan Electric Corporation Railroad rail-connector assembly

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1034490A (fr) * 1951-03-28 1953-07-24 Dispositif de branchement pour connexions électriques
US4357068A (en) * 1980-04-02 1982-11-02 Pan Electric Corporation Cable clamping device
US4898551A (en) * 1989-04-11 1990-02-06 Pan Electric Corporation Cable clamp

Also Published As

Publication number Publication date
EP0699352A1 (de) 1996-03-06
DE69404462D1 (de) 1997-09-04
JPH08510595A (ja) 1996-11-05
DK0699352T3 (da) 1998-03-16
DE69404462T2 (de) 1998-02-26
WO1995025361A1 (en) 1995-09-21

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