EP0013673B1 - Strain relief for electric cables - Google Patents

Strain relief for electric cables Download PDF

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Publication number
EP0013673B1
EP0013673B1 EP19790100228 EP79100228A EP0013673B1 EP 0013673 B1 EP0013673 B1 EP 0013673B1 EP 19790100228 EP19790100228 EP 19790100228 EP 79100228 A EP79100228 A EP 79100228A EP 0013673 B1 EP0013673 B1 EP 0013673B1
Authority
EP
European Patent Office
Prior art keywords
screw
cable
bore
strain relief
clamping screw
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19790100228
Other languages
German (de)
French (fr)
Other versions
EP0013673A1 (en
Inventor
Friedrich Kruttschnitt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cooper Industries LLC
Original Assignee
Cooper Industries LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cooper Industries LLC filed Critical Cooper Industries LLC
Priority to EP19790100228 priority Critical patent/EP0013673B1/en
Publication of EP0013673A1 publication Critical patent/EP0013673A1/en
Application granted granted Critical
Publication of EP0013673B1 publication Critical patent/EP0013673B1/en
Expired legal-status Critical Current

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/58Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable
    • H01R13/595Bolts operating in a direction transverse to the cable or wire
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/56Means for preventing chafing or fracture of flexible leads at outlet from coupling part
    • H01R13/562Bending-relieving

Definitions

  • the invention relates to a strain relief for electrical cables which are passed through an essentially cylindrical bore of a component and are held in this bore by means of a clamping screw.
  • the invention has for its object to provide a strain relief of the type mentioned, in which it is ensured that the plastic clamping screw is not accidentally replaced by a metal screw, further reducing the risk of destruction of the cable at the location of the clamping screw .
  • the clamping screw is made of preferably weakly elastic plastic and has at its end facing the cable a central bore that widens into the interior of the screw, that the end of the screw has slots in the area of the central bore, in order to allow the narrowed end of the bore to be spread open and that a pressure piece acting on the cable is provided which has a projection directed towards the screw with an outwardly widened end which can be snapped into the central bore of the clamping screw as long as the slotted area of this screw is located outside the threaded hole receiving this screw.
  • the attachment of the pressure piece can only be pressed into or pulled out of the central bore of the clamping screw if the clamping screw protrudes far enough from the threaded hole provided in the electrical device into the interior of the hole for receiving the cable in order to spread the slotted one End this clamping screw to allow.
  • it is not possible to separate the pressure piece from the clamping screw if an attempt is made to unscrew the clamping screw from its threaded hole, since in this case the threaded hole tightly encloses the slotted end of the clamping screw and makes it impossible to spread it out. In this way, the clamping screw and the pressure piece cannot be accidentally removed and replaced by a metallic clamping screw.
  • the plastic screw and the pressure piece are captively fastened in the insertion part of the electrical device and, according to an advantageous embodiment of the invention, the kink protection sleeve is provided with an opening through which the clamping screw can protrude, the pressure piece being located inside the kink protection sleeve. In this way, the kink protection sleeve is also captive.
  • strain relief shown in the drawings is explained, for example, in application to the introduction of a cable 2 into the handle 1 of an electrical device, for example a soldering iron, which has a through hole 1 a for the cable 2.
  • This cable 2 is surrounded by an anti-kink sleeve 3, which prevents excessive strain on the cable.
  • the strain relief is formed by a clamping screw 7, which acts on a pressure piece 4 and is arranged in a threaded bore 9 of the handle 1.
  • the pressure piece 4 has an extension 5, which is expanded approximately spherically at its free end in the exemplary embodiment shown and is engaged in a central bore 6 of the clamping screw 7, which has a shape corresponding to the extension 5.
  • the end of the clamping screw 7 facing the cable 2 and thus the pressure piece 4 is provided with slots 8, as can be seen in particular from FIG. 3. These slots allow the end of the clamping screw 7 directed towards the pressure piece 4, so that the projection 5 of this pressure piece 4 can snap into the central bore 6.
  • the pressure piece is mounted on the clamping screw before the cable is inserted, the clamping screw 7 being turned sufficiently far into the hole 1a in the handle so that the slotted end of this clamping screw lies outside the threaded hole 9.
  • the pressure piece 4 snaps into place after the anti-kink sleeve 3 has been inserted, which has an opening or recess 10 which allows the clamping screw 7, but not the pressure piece 4, to pass through. In this way, the kink protection sleeve is held captive on the handle 1 of the electrical device.
  • the clamping screw 7 After engaging the shoulder 5 of the pressure piece 4 in the central bore 6, the clamping screw 7 is turned back so far that the insertion of the cable 2 is made possible, whereupon the clamping screw is tightened to the desired holding force of the cable.

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  • Installation Of Indoor Wiring (AREA)

Description

Die Erfindung bezieht sich auf eine Zugentlastung für elektrische Kabel, die durch eine im wesentlichen zylindrische Bohrung eines Bauteils hindurchgeführt unct in dieser Bohrung mit Hilfe einer Klemmschraube festgehalten werden.The invention relates to a strain relief for electrical cables which are passed through an essentially cylindrical bore of a component and are held in this bore by means of a clamping screw.

Bei vielen elektrischen Geräten ist es erforderlich, eine Zugentlastung für das Kabel an der Eintrittstelle dieses Kabels vorzusehen. In den Fällen, in denen das Kabel durch eine Bohrung mit erheblicher Länge in das elektrische Gerät eingeführt wird, werden zu diesem Zweck Klemmschrauben verwendet, die direkt oder unter Zwischenfügung einer Knickschutztülle auf das Kabel drücken und damit ein Herausziehen dieses Kabels verhindern. Als Klemmschrauben werden hierfür Kunststoffschrauben verwendet, da anderenfalls die Möglichkeit bestehen könnte, daß bei einem Durchscheuern oder einer Beschädigung des Kabels ein elektrischer Kontakt zwischen dieser Klemmschraube und den Leitern des elektrischen Kabels erfolgen könnte, so daß die Klemmschraube unter Spannung stehen würde, was aus Sicherheitsgründen nicht zulässig ist. Bei einer Reparatur oder einem Austausch des Kabels besteht jedoch die Möglichkeit, daß die aus Kunststoff bestehende Klemmschraube verlorengeht oder aus anderen Gründen in fehlerhafter Weise durch eine Metallschraube ersetzt wird, so daß eine erhebliche Gefahr für die Bedienungsperson des elektrischen Gerätes besteht.Many electrical devices require strain relief for the cable at the entry point of this cable. In cases in which the cable is inserted into the electrical device through a hole of considerable length, clamping screws are used for this purpose, which press the cable directly or with the addition of an anti-kink sleeve and thus prevent this cable from being pulled out. Plastic screws are used as clamping screws for this purpose, since otherwise there could be the possibility that if the cable is chafed or damaged, electrical contact could take place between this clamping screw and the conductors of the electrical cable, so that the clamping screw would be under tension, which for safety reasons is not permitted. When repairing or replacing the cable, however, there is a possibility that the plastic clamping screw will be lost or, for other reasons, incorrectly replaced by a metal screw, so that there is a considerable risk to the operator of the electrical device.

Der Erfindung liegt die Aufgabe zugrunde, eine Zugentlastung der eingangs genannten Art zu schaffen, bei der sichergestellt ist, daß die aus Kunststoff bestehende Klemmschraube nicht versehentlich durch eine Metallschraube ersetzt wird, wobei weiterhin die Gefahr einer Zerstörung des Kabels an der Stelle der Klemmschraube verringert wird.The invention has for its object to provide a strain relief of the type mentioned, in which it is ensured that the plastic clamping screw is not accidentally replaced by a metal screw, further reducing the risk of destruction of the cable at the location of the clamping screw .

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Klemmschraube aus vorzugsweise schwach elastischem Kunststoff ausgebildet ist und an ihrem dem Kabel zugewandten Ende eine sich in das Innere der Schraube hin erweiternde zentrische Bohrung aufweist, daß das Ende der Schraube im Bereich der zentrischen Bohrung Schlitze aufweist, um ein Aufspreizen des verengten Endes der Bohrung zu ermöglichen und daß ein auf das Kabel wirkendes Druckstück vorgesehen ist, das einem auf die Schraube gerichteten Ansatz mit einem nach außen hin erweiterten Ende aufweist, der in die zentrische Bohrung der Klemmschraube einrastbar ist, so lange sich der geschlitzte Bereich dieser Schraube außerhalb der diese Schraube aufnehmenden Gewindebohrung befindet.This object is achieved in that the clamping screw is made of preferably weakly elastic plastic and has at its end facing the cable a central bore that widens into the interior of the screw, that the end of the screw has slots in the area of the central bore, in order to allow the narrowed end of the bore to be spread open and that a pressure piece acting on the cable is provided which has a projection directed towards the screw with an outwardly widened end which can be snapped into the central bore of the clamping screw as long as the slotted area of this screw is located outside the threaded hole receiving this screw.

Hierbei kann der Ansatz des Druckstückes nur dann in die zentrische Bohrung der Klemmschraube eingedrückt oder aus dieser herausgezogen werden, wenn die Klemmschraube ausreichend weit aus der in dem elektrischen Gerät vorgesehenen Gewindebohrung in das Innere der Bohrung zur Aufnahme des Kabels hineinragt, um eine Aufspreizen des geschlitzten Endes dieser Klemmschraube zu ermöglichen. Es ist andererseits nicht möglich, das Druckstück von der Klemmschraube zu trennen, wenn versucht wird, die Klemmschraube aus ihrer Gewindebohrung herauszudrehen, da in diesem Fall die Gewindebohrung das geschlitzte Ende der Klemmschraube fest umschließt und ein Aufspreizen unmöglich macht. Auf diese Weise kann die Klemmschraube sowie das Druckstück nicht versehentlich entfernt und durch eine metallische Klemmschraube ersetzt werden. Die Kunststoffschraube sowie das Druckstück ist unverlierbar in dem Einführungsteil des elektrischen Gerätes befestigt und gemäß einer vorteilhaften Ausgestaltung der Erfindung ist die Knickschutztülle mit einer Öffnung versehen, durch die die Klemmschraube hindurchragen kann, wobei sich das Druckstück im Inneren der Knickschutztülle befindet. Auf diese Weise wird auch die Knickschutztülle unverlierbar.In this case, the attachment of the pressure piece can only be pressed into or pulled out of the central bore of the clamping screw if the clamping screw protrudes far enough from the threaded hole provided in the electrical device into the interior of the hole for receiving the cable in order to spread the slotted one End this clamping screw to allow. On the other hand, it is not possible to separate the pressure piece from the clamping screw if an attempt is made to unscrew the clamping screw from its threaded hole, since in this case the threaded hole tightly encloses the slotted end of the clamping screw and makes it impossible to spread it out. In this way, the clamping screw and the pressure piece cannot be accidentally removed and replaced by a metallic clamping screw. The plastic screw and the pressure piece are captively fastened in the insertion part of the electrical device and, according to an advantageous embodiment of the invention, the kink protection sleeve is provided with an opening through which the clamping screw can protrude, the pressure piece being located inside the kink protection sleeve. In this way, the kink protection sleeve is also captive.

Weitere vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den Ansprüchen.Further advantageous refinements and developments of the invention result from the claims.

Die Erfindung wird im folgenden anhand eines in der Zeichnung dargestellten Ausführungsbeispiels noch näher erläutert.The invention is explained in more detail below with reference to an embodiment shown in the drawing.

In der Zeichnung zeigen:

  • Fig. 1 einen Längsschnitt durch ein Ausführungsbeispiel der Zugentlastung;
  • Fig. 2 eine Querschnittsansicht entlang der Linie 11-11 nach Fig. 1;
  • Fig. 3 eine Draufsicht auf das untere Ende der Klemmschraube nach Fig. 1.
The drawing shows:
  • 1 shows a longitudinal section through an embodiment of the strain relief.
  • Fig. 2 is a cross-sectional view taken along line 11-11 of Fig. 1;
  • 3 shows a plan view of the lower end of the clamping screw according to FIG. 1.

Die in den Zeichnungen dargestellte Ausführungsform der Zugentlastung wird beispielsweise in Anwendung auf die Einführung eines Kabels 2 in den Griff 1 eines elektrischen Gerätes, beispielsweise eines Lötkolbens erläutert, der eine durchgehende Bohrung la für das Kabel 2 aufweist. Dieses Kabel 2 ist von einer Knickschutztülle 3 umgeben, die eine übermäßige Knickbeanspruchung des Kabels verhindert.The embodiment of the strain relief shown in the drawings is explained, for example, in application to the introduction of a cable 2 into the handle 1 of an electrical device, for example a soldering iron, which has a through hole 1 a for the cable 2. This cable 2 is surrounded by an anti-kink sleeve 3, which prevents excessive strain on the cable.

Die Zugentlastung ist durch eine Klemmschraube 7 gebildet, die auf eine Druckstück 4 wirkt und in einer Gewindebohrung 9 des Griffes 1 angeordnet ist. Das Druckstück 4 weist einen Ansatz 5 auf, der an seinem freien Ende in dem dargestellten Ausführungsbeispiel in etwa kugelförmig erweitert ist und in eine zentrische Bohrung 6 der Klemmschraube 7 eingerastet ist, die eine dem Ansatz 5 entsprechende Gestalt aufweist. Das dem Kabel 2 und damit dem Druckstück 4 zugewandte Ende der Klemmschraube 7 ist mit Schlitzen 8 versehen, wie dies inbesondere aus Fig. 3 zu erkennen ist. Diese Schlitze ermöglichen ein Aufspreizen des auf das Druckstück 4 gerichteten Endes der Klemmschraube 7, so daß der Ansatz 5 dieses Druckstückes 4 in die zentrische Bohrung 6 einrasten kann.The strain relief is formed by a clamping screw 7, which acts on a pressure piece 4 and is arranged in a threaded bore 9 of the handle 1. The pressure piece 4 has an extension 5, which is expanded approximately spherically at its free end in the exemplary embodiment shown and is engaged in a central bore 6 of the clamping screw 7, which has a shape corresponding to the extension 5. The end of the clamping screw 7 facing the cable 2 and thus the pressure piece 4 is provided with slots 8, as can be seen in particular from FIG. 3. These slots allow the end of the clamping screw 7 directed towards the pressure piece 4, so that the projection 5 of this pressure piece 4 can snap into the central bore 6.

Dieses Einrasten des Ansatzes 5 des Druckstückes 4 in die zentrische Bohrung 6 der Klemmschraube 7 ist jedoch nur dann möglich, wenn sich das geschlitzt Ende dieser Klemmschraube 7 außerhalb der Gewindeborhrung 9 in dem Griff 1 befindet, da anderenfalls ein Aufspreizen dieses Endes nicht möglich ist. Sobald der Ansatz 5 in die zentrische Bohrung 6 eingerastet ist, ist es nicht mehr möglich, die Klemmschraube 7 durch Zurückdrehen aus der Gewindebohrung 9 zu entfernen, da in diesem Fall das Druckstück zur Anlage an der Innenfläche der Bohrung la des Griffes 1 kommt und das geschlitzte Ende der Klemmschraube 7 fest von der Gewindebohrung 9 umschlossen ist und sich nicht aufspreizen kann. Das Druckstück kann sich daher nicht von der Klemmschraube 7 lösen und ein weiteres Zurückdrehen der Klemmschraube ist nicht möglich.However, this engagement of the shoulder 5 of the pressure piece 4 in the central bore 6 of the clamping screw 7 is only possible if the slotted end of this clamping screw 7 is outside the threaded bore 9 in the handle 1, since otherwise this end cannot be spread apart. As soon as the projection 5 is engaged in the central bore 6, it is no longer possible to remove the clamping screw 7 by turning back from the threaded bore 9, since in this case the pressure piece comes to rest against the inner surface of the bore la of the handle 1 and that slotted end of the clamping screw 7 is tightly enclosed by the threaded bore 9 and can not spread. The pressure piece can therefore not come loose from the clamping screw 7 and a further turning back of the clamping screw is not possible.

Die Montage des Druckstückes an der Klemmschraube wird vor dem Einsetzen des Kabels vorgenommen, wobei die Klemmschraube 7 ausreichend weit in die Bohrung la des Griffes vorgedreht wird, damit das geschlitzte Ende dieser Klemmschraube außerhalb der Gewindebohrung 9 liegt. Vorzugsweise erfolgt das Einrasten des Druckstückes 4 jedoch nach dem Einschieben der Knickschutztülle 3, die eine Öffnung oder Ausnehmung 10 aufweist, die den Durchgang der Klemmschraube 7, nicht jedoch des Druckstückes 4 ermöglicht. Auf diese Weise wird auch die Knickschutztülle unverlierbar an dem Griff 1 des elektrischen Gerätes festgehalten. Nach dem Einrasten des Ansatzes 5 des Druckstückes 4 in die zentrische Bohrung 6 wird die Klemmschraube 7 so weit zurückgedreht, daß das Einschieben des Kabels 2 ermöglicht wird, worauf die Klemmschraube bis zur gewünschten Haltekraft des Kabels angezogen wird.The pressure piece is mounted on the clamping screw before the cable is inserted, the clamping screw 7 being turned sufficiently far into the hole 1a in the handle so that the slotted end of this clamping screw lies outside the threaded hole 9. Preferably, however, the pressure piece 4 snaps into place after the anti-kink sleeve 3 has been inserted, which has an opening or recess 10 which allows the clamping screw 7, but not the pressure piece 4, to pass through. In this way, the kink protection sleeve is held captive on the handle 1 of the electrical device. After engaging the shoulder 5 of the pressure piece 4 in the central bore 6, the clamping screw 7 is turned back so far that the insertion of the cable 2 is made possible, whereupon the clamping screw is tightened to the desired holding force of the cable.

Bei einem eventuellen Austausch oder einem Herausziehen des Kabels zu Reparaturzwecken des elektrischen Gerätes ist es dann nicht möglich, die Klemmschraube 7 oder die Knickschutztülle 3 ohne Gewaltanwendung oder ohne die Zuhilfenahme besonderer Maßnahmen zu entfernen. Ein unbeabsichtigtes Verlieren der Klemmschraube, des Druckstückes und der Knickschutztülle ist damit ausgeschlossen.In the event of a possible replacement or a pulling out of the cable for repair purposes of the electrical device, it is then not possible to remove the clamping screw 7 or the kink protection sleeve 3 without using force or without the aid of special measures. An unintentional loss of the clamping screw, the pressure piece and the anti-kink sleeve is excluded.

Durch die Vergrößerung der Fläche des auf das Kabel 2 wirkenden Druckstückes 4 wird weiterhin eine schonende Behandlung dieses Kables ohne unzulässiges Einkerben oder dergleichen erzielt.By increasing the area of the pressure piece 4 acting on the cable 2, a gentle treatment of this cable is achieved without undue notching or the like.

Claims (4)

1. A strain relief for electric cables (2), which are guided through a substantially cylindrical bore (6) of a component (1) and are secured in this bore with the aid of a clamp screw (7), characterised in that the clamp screw (7) is formed out of preferably weak elastic synthetic material and has a central bore (6) which widens into the interior of the screw (7) at its end facing the cable (2), in that the end of the screw in the region of the central bore (6) has slots (8) in order to enable the narrowed end of the bore to spread and in that a pressure member (4) acting on the cable (2) is provided, which has a projection (5) directed towards the screw, with an end with widens in the outward direction, which is engageable into the central bore (6) of the clamp so long as the slotted region of this screw is located outside the threaded bore (9) accommodating this screw (7).
2. A strain relief in accordance with Claim 1 and characterised in that an anti-buckling mouthpiece (3) is provided for the cable (2) and in that the anti-buckling mouthpiece has an aperture (10) in the region of the clamp screw (7) the dimensions of which are greater than the diameter of the clamp screw (7) however smaller than the dimensions of the pressure member (4) and in that the pressure member (4) is located inside the anti-buckling mouthpiece (3).
3. A strain relief in accordance with either Claim 1 or Claim 2, and characterised in that the clamp screw (7) has two slots (8) arranged at right angles to one another along its end facing the cable.
4. A strain relief in accordance with one of the previous claims and characterised in that the projection (5) of the pressure member (4) is substantially spherically widened at its free end and in that the central bore (6) of the clamp screw (7) is likewise spherically widened towards the inside of this screw.
EP19790100228 1979-01-26 1979-01-26 Strain relief for electric cables Expired EP0013673B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19790100228 EP0013673B1 (en) 1979-01-26 1979-01-26 Strain relief for electric cables

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19790100228 EP0013673B1 (en) 1979-01-26 1979-01-26 Strain relief for electric cables

Publications (2)

Publication Number Publication Date
EP0013673A1 EP0013673A1 (en) 1980-08-06
EP0013673B1 true EP0013673B1 (en) 1982-11-17

Family

ID=8186070

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790100228 Expired EP0013673B1 (en) 1979-01-26 1979-01-26 Strain relief for electric cables

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EP (1) EP0013673B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2413433B1 (en) * 2010-07-27 2012-12-05 Helvar Oy Ab Connector arrangement for an electrical lighting device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3390712A (en) * 1966-12-22 1968-07-02 Whittaker Corp Self-locking fastener
DE6931196U (en) * 1969-08-06 1969-12-18 Elektro App K G Gothe & Co INLET SOCKET WITH CLAMPING PIECE FOR TENSION-RESISTANT CLAMPING OF LINES AND - OR CABLES.
DE7614286U1 (en) * 1976-05-06 1976-10-28 Baco Constructions Electriques Anc. Baumgarten, Strassburg-Meinau (Frankreich) Box clamp for electrical cables

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Publication number Publication date
EP0013673A1 (en) 1980-08-06

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