EP3618191B1 - Connection terminal and electrical apparatus - Google Patents

Connection terminal and electrical apparatus Download PDF

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Publication number
EP3618191B1
EP3618191B1 EP18306158.9A EP18306158A EP3618191B1 EP 3618191 B1 EP3618191 B1 EP 3618191B1 EP 18306158 A EP18306158 A EP 18306158A EP 3618191 B1 EP3618191 B1 EP 3618191B1
Authority
EP
European Patent Office
Prior art keywords
terminal
threaded hole
conductor
connecting bolt
clamp
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.)
Active
Application number
EP18306158.9A
Other languages
German (de)
French (fr)
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EP3618191A1 (en
Inventor
Volker Markgraf
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.)
Nexans SA
Original Assignee
Nexans SA
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Filing date
Publication date
Application filed by Nexans SA filed Critical Nexans SA
Priority to EP18306158.9A priority Critical patent/EP3618191B1/en
Priority to US16/555,440 priority patent/US10923838B2/en
Publication of EP3618191A1 publication Critical patent/EP3618191A1/en
Application granted granted Critical
Publication of EP3618191B1 publication Critical patent/EP3618191B1/en
Active legal-status Critical Current
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
    • H01R11/03—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts characterised by the relationship between the connecting locations
    • H01R11/05—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts characterised by the relationship between the connecting locations the connecting locations having different types of direct connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R31/00—Coupling parts supported only by co-operation with counterpart
    • H01R31/02—Intermediate parts for distributing energy to two or more circuits in parallel, e.g. splitter
    • 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
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/304—Clamped connections, spring connections utilising a screw or nut clamping member having means for improving contact
    • 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
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/305—Clamped connections, spring connections utilising a screw or nut clamping member having means for facilitating engagement of conductive member or for holding it in position
    • 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
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/36—Conductive members located under tip of screw
    • 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
    • H01R4/56—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 one conductor screwing into another
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/22—Bases, e.g. strip, block, panel
    • H01R9/24—Terminal blocks
    • H01R9/2416—Means for guiding or retaining wires or cables connected to terminal blocks

Definitions

  • the invention relates to a clamp for connecting a conductor to a connection part, in particular to a connection bolt of an electrical apparatus, for example a transformer.
  • the invention relates to an electrical apparatus with a connecting bolt onto which a terminal according to the invention is screwed.
  • connection bolts to which electrical lines are connected, the connecting bolts being in many cases designed as threaded bolts.
  • connection bolts can be found, for example, on the low-voltage side of transformers.
  • Electrical lines are often connected to the terminal bolts with screw terminals.
  • a clamp for connecting a conductor to a terminal stud of a transformer is known.
  • the terminal is designed in such a way that the lines are routed away at right angles to the longitudinal axis of the connecting bolt. This means that with a connection bolt oriented in the vertical direction, the cables are routed in the horizontal direction.
  • a connection bolt oriented in the vertical direction the cables are routed in the horizontal direction.
  • a different type of terminal is required. This means that at least two different types of clamps must be available.
  • the U.S. 2018/006399 A1 relates to a clamp for portable power supplies and other applications.
  • the terminal has a clamping screw by means of which a conductor 30 inserted into a conductor opening is clamped in order to establish an electrically conductive connection with the terminal.
  • the terminal has a further threaded hole for fastening the terminal to a busbar, for example.
  • the U.S. 2011/237140 A1 discloses a clamp that has a passage with which the clamp can be mounted, for example, on a ground connection by means of a pressure screw.
  • the GB 1 422 935 A describes a clamp with multiple clamp screws and holes to mount the clamp.
  • the surface of the openings for the conductors is provided with a surface structure.
  • an object of the present invention is to provide an alternative clamp that can be used more flexibly than previously known clamps and that can be clamped on a connection bolt in a simple manner.
  • the invention proposes a clamp according to claim 1.
  • the clamp has a first and a second threaded hole which cross perpendicularly.
  • the internal threads of the first and second threaded holes match the external threads of the terminal bolt.
  • the terminal can therefore be screwed onto the connection bolt in two different orientations.
  • the terminal has a conductor channel along an axis that is parallel to an axial direction of the first threaded hole.
  • the clamp has a further threaded hole for receiving a pressure screw, which opens into the conductor channel.
  • the threaded hole is oriented perpendicular to the axis of the conductor channel.
  • the clamp has a second pressure screw which is screwed into the same threaded hole as the terminal bolt but in the opposite direction as the terminal bolt. This pressure screw tightens the terminal on the connection bolt without further means being required for this, in particular no second pressure screw is necessary for this.
  • the design of the terminal allows one or more conductors to be connected in two different orientations with respect to the longitudinal axis of the terminal stud. Therefore, the terminal is suitable for different installation positions, eliminating the need to keep different terminals for different installation positions.
  • the threaded hole in which the terminal stud is not screwed allows inspection of the correct mounting of the clamp on the terminal stud.
  • the free threaded hole can be used to attach another connection bolt, for example a ball joint.
  • the conductor channel has grooves and/or projections.
  • the structured inner surface of the conductor channel generates a high contact pressure for one in the Conductor channel recorded conductor, so that any existing oxide layers on the surface of the conductor are broken up and a good electrical contact is created.
  • a plurality of conductor channels are advantageously provided in the terminal, in particular two parallel conductor channels.
  • a higher number of conductor channels allows a corresponding number of wires to be connected to the terminal.
  • the conductor channels are arranged to the left and right of one of the two threaded holes. This configuration has proven to be particularly space-saving and expedient during assembly.
  • the first and the second threaded hole which cross each other perpendicularly, can each be arranged centrally in a main surface of a clamp body of the clamp.
  • This embodiment enables the terminal to be mounted symmetrically on the connecting bolt.
  • the invention proposes an electrical apparatus with a connection bolt onto which a terminal according to the first aspect of the invention is screwed.
  • the electrical apparatus is, for example, a transformer, in particular the low-voltage side of a transformer.
  • FIG. 1 12 is a perspective view of an embodiment of a clamp according to the invention, denoted as a whole by reference numeral 100.
  • FIG. 1 a connecting bolt 101 for an electrical apparatus is shown below the terminal 100, which is provided with an external thread 102. Only part of a housing 103 of the electrical apparatus is shown and indicated schematically with a line.
  • the connecting bolt 101 is passed through the housing 103 and insulated from the housing 103 with insulators 106,107.
  • the electrical apparatus is a transformer and the housing 103 is accordingly the transformer housing.
  • it can be the low-voltage side of a transformer that is equipped with bushings according to DIN EN 50386.
  • the invention is not limited to this type of connecting bolt, but rather can also be applied to other types of threaded bolts to which electrical lines are to be connected.
  • the proposed clamp 100 has a clamp body 108 which is essentially cuboid. Accordingly, the clamp body 108 comprises a first main surface 109a and an opposite second main surface 109b. In addition, the clamp body 108 has a third main surface 109c, which is figure 1 is on top and a fourth main surface 109d which is opposite to the third main surface 109c.
  • a first threaded hole 111 centrally located in the first main surface 109a extends from the first main surface 109a to the second main surface 109b.
  • a second threaded hole 112 extends from the third main surface 109c to the fourth main surface 109d and is also centrally located in the middle of the third and fourth main surfaces, respectively. Accordingly, the first and second threaded holes 111, 112 intersect in the center of the clamp body 108.
  • the internal threads of the threaded holes 111, 112 match the external thread 102 of the connecting bolt 101.
  • a continuous first and second conductor channel 113, 114 are arranged on both sides of the first threaded hole.
  • the conductor channels 113 and 114 thus extend from the first main surface 109a to the second main surface 109b.
  • a threaded hole 116 is provided in the third main surface 109c, which opens into the first conductor channel 113 and which accommodates a pressure screw 117 . It is consequently possible with the pressure screw 117 to clamp a conductor inserted into the conductor channel 113 in the terminal body 108 .
  • a threaded hole 118 is provided in the third main surface 109c, which opens into the second conductor channel 114 and which accommodates a pressure screw 119, with which a conductor inserted into the conductor channel 114 can be clamped in the terminal body 108.
  • FIG 2 shows the terminal 100 screwed onto the connection bolt 101.
  • the connection bolt 101 is screwed into the second central threaded hole 112 to such an extent that the connection bolt 101 protrudes approximately to the middle of the first central threaded hole 111.
  • the pressure screw 121 is screwed from the third main surface 109c against the connection bolt 101 into the second central threaded hole 112, so that the end faces of the connection bolt 101 and the pressure screw 121 are pressed against one another and thereby mechanically brace the terminal body 108 with the connection bolt 101 and at the same time Establish good electrical contact between terminal body 108 and connecting bolt 101.
  • a single pressure screw 121 is therefore sufficient to generate the contact pressure and achieve mechanical bracing on the connecting bolt.
  • the first central threaded hole 111 enables an assembly person to carry out a visual inspection to check whether the clamp 100 has been screwed onto the connection bolt 101 far enough or too far.
  • the insides of the conductor channels 113, 114 have an area that is provided with longitudinal ribs 122 as a surface structure.
  • the longitudinal ribs 122 have a triangular cross-section. In other exemplary embodiments, other cross-sectional shapes can also be selected.
  • the areas with the surface structure are in the conductor channels 113,114 on the side opposite to the side where the pressure screw 117 or 119 enters the conductor channel 113 or 114, respectively.
  • the pressure screw 117 or 119 therefore presses the conductor against the corresponding surface structure of the longitudinal ribs 122, which break up any oxide layer that may be present on the conductor and in this way promote the establishment of a good electrical contact.
  • Such disturbing insulating oxide layers occur, for example, in conductors made of aluminum or aluminum alloys.
  • FIG 3 1 is a perspective view of terminal 100 mounted on terminal stud 101.
  • FIG. Two conductors 301 and 302 are mounted in the terminal 100 and are illustrated by short conductor sections.
  • An arrow V points to figure 3 indicates a vertical direction, while an arrow H indicates a horizontal direction. This convention shall apply to all figures.
  • the conductor channels 113, 114 are oriented in the horizontal direction and thereby allow a simple assembly of lines 301, 302 running horizontally.
  • FIG 4 is in contrast to figure 3 the clamp 100 is screwed onto the connecting bolt 101 by means of the first central threaded hole 111, so that the conductor channels extend parallel to the connecting bolt 101 and thus enable lines 301, 302 running in the vertical direction to be easily installed.
  • the horizontal and vertical connection options for the lines 301, 302 are consequently achieved with one and the same clamp 100, which is only screwed onto the connection bolt in two different orientations.
  • the proposed clamp thus eliminates the need to keep different clamps in order to connect cables in different orientations with respect to the connection bolt.
  • figure 5 shows the terminal 100 mounted on the connection bolt 101, with the conductor channels 113, 114 as in figure 3 are oriented horizontally.
  • the connecting bolt is screwed into the second central threaded hole 112 figure 5 illustrated embodiment, a ball stud 501 is screwed into the first central threaded hole 111 in order to create further connection options for additional lines.
  • figure 6 shows the terminal 100 mounted on the connecting bolt 101, with the conductor channels 113, 114 as in figure 4 are oriented vertically. With this orientation, the connecting bolt is screwed into the second central threaded hole 112 .
  • a ball stud 501 is screwed into the second central threaded hole 111 in order to create further connection options for additional lines.
  • FIG. 5 A comparison between the Figures 5 and 6 Fig. 5 shows that the additional ball stud 501 always has a horizontal orientation when the connecting stud has a vertical orientation, because the free central threaded hole is always oriented horizontally in this case.
  • the pressure screw in 117, 119 makes direct contact with the connected conductors.
  • movable pressure pieces can also be provided, which are pressed onto the conductor by the pressure screw in order to establish the electrical contact.
  • the proposed terminal can be made, for example, from copper, aluminum and their alloys and other electrically highly conductive metals and their alloys.
  • the connected line is not clamped directly with a pressure screw, but a movable pressure part is provided in the conductor channel in the clamp.
  • a movable pressure part is provided in the conductor channel in the clamp.

Description

Gebietarea

Die Erfindung betrifft eine Klemme zum Verbinden eines Leiters mit einem Anschlussteil, insbesondere mit einem Anschlussbolzen einer elektrischen Apparatur, zum Beispiel einem Transformator. Außerdem betrifft die Erfindung eine elektrische Apparatur mit einem Anschlussbolzen auf den eine erfindungsgemäße Klemme aufgeschraubt ist.The invention relates to a clamp for connecting a conductor to a connection part, in particular to a connection bolt of an electrical apparatus, for example a transformer. In addition, the invention relates to an electrical apparatus with a connecting bolt onto which a terminal according to the invention is screwed.

Hintergrundbackground

Elektrische Apparate wie zum Beispiel Transformatoren, die in elektrischen Versorgungsnetzen zum Einsatz kommen, weisen häufig Anschlussbolzen auf, an die elektrische Leitungen angeschlossen sind, wobei die Anschlussbolzen in vielen Fällen als Gewindebolzen ausgebildet sind. Konkret sind solche Anschlussbolzen beispielsweise auf der Niederspannungsseite von Transformatoren zu finden. Elektrische Leitungen sind vielfach mit Schraubklemmen an die Anschlussbolzen angeschlossen.Electrical devices such as transformers, which are used in electrical supply networks, often have connecting bolts to which electrical lines are connected, the connecting bolts being in many cases designed as threaded bolts. Specifically, such connection bolts can be found, for example, on the low-voltage side of transformers. Electrical lines are often connected to the terminal bolts with screw terminals.

Aus der DE 2 228 088 A1 ist eine Klemme zum Verbinden eines Leiters mit einem Anschlussbolzen eines Transformators bekannt. Die Klemme ist dabei so ausgebildet, dass die Leitungen in Bezug auf die Längsachse des Anschlussbolzens rechtwinklig weggeführt werden. D.h. bei einem in vertikaler Richtung orientierten Anschlussbolzen werden die Leitungen in horizontaler Richtung weggeführt. Wenn es in bestimmten Anwendungsfällen jedoch notwendig ist, die Leitungen parallel zu dem Anschlussbolzen anzuschließen, wird eine andere Art von Anschlussklemme benötigt. Das bedeutet, dass mindestens zwei unterschiedliche Arten von Klemmen vorgehalten werden müssen.From the DE 2 228 088 A1 a clamp for connecting a conductor to a terminal stud of a transformer is known. The terminal is designed in such a way that the lines are routed away at right angles to the longitudinal axis of the connecting bolt. This means that with a connection bolt oriented in the vertical direction, the cables are routed in the horizontal direction. However, if in certain applications it is necessary to connect the wires parallel to the terminal stud, a different type of terminal is required. This means that at least two different types of clamps must be available.

Die US 2018/006399 A1 betrifft eine Klemme für tragbare Stromversorgungen und andere Anwendungen. Die Klemme weist eine Klemmschraube auf, mittels derer ein in eine Leiteröffnung eingelegter Leiter 30 festgeklemmt wird, um eine elektrisch leitfähige Verbindung mit der Klemme herzustellen. Zur Befestigung der Klemme beispielsweise auf einer Stromschiene weist die Klemme ein weiteres Gewindeloch auf.the U.S. 2018/006399 A1 relates to a clamp for portable power supplies and other applications. The terminal has a clamping screw by means of which a conductor 30 inserted into a conductor opening is clamped in order to establish an electrically conductive connection with the terminal. The terminal has a further threaded hole for fastening the terminal to a busbar, for example.

Die US 2011/237140 A1 offenbart eine Klemme, die einen Durchlass aufweist, mit dem die Klemme beispielsweise auf einem Masseanschluss mittels einer Druckschraube montierbar ist.the U.S. 2011/237140 A1 discloses a clamp that has a passage with which the clamp can be mounted, for example, on a ground connection by means of a pressure screw.

Die GB 1 422 935 A beschreibt eine Klemme mit mehreren Klemmschrauben sowie Bohrungen, um die Klemme zu montieren. Die Oberfläche der Öffnungen für die Leiter ist mit einer Oberflächenstruktur versehen.the GB 1 422 935 A describes a clamp with multiple clamp screws and holes to mount the clamp. The surface of the openings for the conductors is provided with a surface structure.

Hiervon ausgehend ist eine Aufgabe der vorliegenden Erfindung, eine alternative Klemme zu schaffen, die gegenüber vorbekannten Klemmen flexibler einsetzbar ist und die auf einem Anschlussbolzen auf einfache Weise verspannt werden kann.Proceeding from this, an object of the present invention is to provide an alternative clamp that can be used more flexibly than previously known clamps and that can be clamped on a connection bolt in a simple manner.

Zusammenfassung der ErfindungSummary of the Invention

Zur Lösung dieser Aufgabe schlägt die Erfindung eine Klemme gemäß Anspruch 1. Die Klemme weist ein erstes und ein zweites Gewindeloch auf, die sich senkrecht kreuzen. Die Innengewinde des ersten und zweiten Gewindeloches passen zu dem Außengewinde des Anschlussbolzens. Deshalb ist die Klemme in zwei unterschiedlichen Orientierungen auf den Anschlussbolzen aufschraubbar. Die Klemme weist einen Leiterkanal entlang einer Achse auf, die parallel zu einer axialen Richtung des ersten Gewindelochs ist. Die Klemme weist ein weiteres Gewindeloch zur Aufnahme einer Druckschraube auf, das in dem Leiterkanal mündet. Das Gewindeloch ist senkrecht zu der Achse des Leiterkanals orientiert. Weiterhin weist die Klemme eine zweite Druckschraube auf, die in dasselbe Gewindeloch wie der Anschlussbolzen, aber in entgegengesetzter Richtung wie der Anschlussbolzen eingeschraubt ist. Diese Druckschraube verspannt die Klemme auf dem Anschlussbolzen ohne dass hierfür noch weitere Mittel erforderlich wären, insbesondere ist keine zweite Druckschraube hierfür notwendig.To solve this problem, the invention proposes a clamp according to claim 1. The clamp has a first and a second threaded hole which cross perpendicularly. The internal threads of the first and second threaded holes match the external threads of the terminal bolt. The terminal can therefore be screwed onto the connection bolt in two different orientations. The terminal has a conductor channel along an axis that is parallel to an axial direction of the first threaded hole. The clamp has a further threaded hole for receiving a pressure screw, which opens into the conductor channel. The threaded hole is oriented perpendicular to the axis of the conductor channel. Furthermore, the clamp has a second pressure screw which is screwed into the same threaded hole as the terminal bolt but in the opposite direction as the terminal bolt. This pressure screw tightens the terminal on the connection bolt without further means being required for this, in particular no second pressure screw is necessary for this.

Der Aufbau der Klemme ermöglicht es, einen oder mehrere Leiter in zwei unterschiedlichen Orientierungen in Bezug auf die Längsachse des Anschlussbolzens anzuschließen. Daher ist die Klemme für unterschiedliche Einbaulagen geeignet, sodass die Notwendigkeit entfällt, unterschiedliche Klemmen für unterschiedliche Einbaulagen vorzuhalten. Während der Montage gestattet das Gewindeloch, in das der Anschlussbolzen nicht eingeschraubt ist, eine Inspektion der richtigen Montage der Klemme auf dem Anschlussbolzen. Nachdem die Klemme mit einer Druckschraube auf dem Anschlussbolzen fixiert ist, kann das freie Gewindeloch zum Anbringen eines weiteren Anschlussbolzens verwendet werden, zum Beispiel für einen Kugelbolzen.The design of the terminal allows one or more conductors to be connected in two different orientations with respect to the longitudinal axis of the terminal stud. Therefore, the terminal is suitable for different installation positions, eliminating the need to keep different terminals for different installation positions. During assembly, the threaded hole in which the terminal stud is not screwed allows inspection of the correct mounting of the clamp on the terminal stud. After the terminal has been fixed to the connection bolt with a pressure screw, the free threaded hole can be used to attach another connection bolt, for example a ball joint.

Bei einer vorteilhaften Ausgestaltung der Klemme weist der Leiterkanal Rillen und/oder Vorsprünge auf. Die strukturierte Innenoberfläche des Leiterkanals erzeugt punktuell einen hohen Anpressdruck für einen in den Leiterkanal aufgenommenen Leiter, sodass eventuell vorhandene Oxidschichten auf der Oberfläche des Leiters aufgebrochen werden und ein guter elektrischer Kontakt erzeugt wird.In an advantageous embodiment of the clamp, the conductor channel has grooves and/or projections. The structured inner surface of the conductor channel generates a high contact pressure for one in the Conductor channel recorded conductor, so that any existing oxide layers on the surface of the conductor are broken up and a good electrical contact is created.

Vorteilhafterweise sind in der Klemme mehrere Leiterkanäle vorgesehen, insbesondere zwei parallele Leiterkanäle. Eine höhere Anzahl von Leiterkanälen gestattet es, eine entsprechende Anzahl von Leitungen mit der Klemme anzuschließen.A plurality of conductor channels are advantageously provided in the terminal, in particular two parallel conductor channels. A higher number of conductor channels allows a corresponding number of wires to be connected to the terminal.

Bei einer bevorzugten Ausgestaltung der Klemme sind die Leiterkanäle links und rechts von einem der beiden Gewindelöcher angeordnet. Diese Ausgestaltung hat sich als besonders raumsparend und zweckmäßig bei der Montage erwiesen.In a preferred embodiment of the terminal, the conductor channels are arranged to the left and right of one of the two threaded holes. This configuration has proven to be particularly space-saving and expedient during assembly.

Vorteilhafterweise können das erste und das zweite Gewindeloch, die sich senkrecht kreuzen, jeweils mittig in einer Hauptfläche eines Klemmenkörpers der Klemme angeordnet sind. Diese Ausführungsform ermöglicht eine symmetrische Montage der Klemme auf dem Anschlussbolzen.Advantageously, the first and the second threaded hole, which cross each other perpendicularly, can each be arranged centrally in a main surface of a clamp body of the clamp. This embodiment enables the terminal to be mounted symmetrically on the connecting bolt.

Nach einem zweiten Aspekt schlägt die Erfindung eine elektrische Apparatur mit einem Anschlussbolzen vor, auf dem eine Klemme nach dem ersten Aspekt der Erfindung aufgeschraubt ist. Die elektrische Apparatur ist beispielsweise ein Transformator, insbesondere die Niederspannungsseite eines Transformators.According to a second aspect, the invention proposes an electrical apparatus with a connection bolt onto which a terminal according to the first aspect of the invention is screwed. The electrical apparatus is, for example, a transformer, in particular the low-voltage side of a transformer.

Kurze Beschreibung der ZeichnungBrief description of the drawing

Nachfolgend wird die Erfindung anhand einer Ausführungsform unter Bezugnahme auf die begleitenden Figuren exemplarisch näher erläutert. Alle Figuren sind rein schematisch und nicht maßstäblich. Es zeigen:

Fig. 1
eine perspektivische Ansicht einer erfindungsgemäßen Klemme und eines Anschlussbolzens;
Fig. 2
die auf den Anschlussbolzen aufgeschraubte Klemme aus Figur 1;
Fig. 3
eine auf den Anschlussbolzen aufgeschraubte Klemme mit zwei in horizontaler Richtung angeschlossenen Leitern;
Fig. 4
eine auf den Anschlussbolzen aufgeschraubte Klemme mit zwei in vertikaler Richtung angeschlossenen Leitern;
Fig. 5
eine auf den Anschlussbolzen aufgeschraubte Klemme mit horizontal orientierten Leiterkanälen und mit einem zusätzlichen Kugelbolzen; und
Fig.6
eine auf den Anschlussbolzen aufgeschraubte Klemme mit vertikal orientierten Leiterkanälen und mit einem zusätzlichen Kugelbolzen.
The invention is explained in more detail below by way of example using an embodiment with reference to the accompanying figures. All figures are purely schematic and not to scale. Show it:
1
a perspective view of a terminal according to the invention and a connecting bolt;
2
the terminal screwed onto the connection bolt figure 1 ;
3
a terminal screwed onto the terminal stud with two conductors connected in the horizontal direction;
4
a terminal screwed onto the terminal stud with two conductors connected in the vertical direction;
figure 5
a terminal screwed onto the connecting bolt with horizontally oriented conductor channels and with an additional ball stud; and
Fig.6
a terminal screwed onto the connecting bolt with vertically oriented conductor channels and with an additional ball stud.

Gleiche oder ähnliche Elemente sind in den Figuren mit gleichen oder ähnlichen Bezugszeichen versehen.Identical or similar elements are provided with the same or similar reference symbols in the figures.

Ausführunasbeispielexecution example

Figur 1 zeigt in einer perspektivischen Ansicht ein Ausführungsbeispiel einer erfindungsgemäßen Klemme, die als Ganzes mit dem Bezugszeichen 100 bezeichnet wird. In Figur 1 ist unterhalb der Klemme 100 ein Anschlussbolzen 101 für eine elektrische Apparatur dargestellt, der mit einem Außengewinde 102 versehen ist. Von der elektrischen Apparatur ist nur ein Teil eines Gehäuses 103 gezeigt und schematisch mit einer Linie angedeutet. Der Anschlussbolzen 101 ist durch das Gehäuse 103 durchgeführt und mit Isolatoren 106,107 gegen das Gehäuse 103 isoliert. Bei einem konkreten Ausführungsbeispiel ist die elektrische Apparatur ein Transformator und das Gehäuse 103 dementsprechend das Transformatorengehäuse. Insbesondere kann es sich bei einem konkreten Ausführungsbeispiel um die Niederspannungsseite eines Transformators handeln, der mit Durchführungen nach DIN EN 50386 ausgestattet ist. Die Erfindung ist jedoch nicht auf diesen Typ von Anschlussbolzen beschränkt, sondern vielmehr auch auf andere Arten von Gewindebolzen anwendbar, an die elektrische Leitungen angeschlossen werden sollen. figure 1 12 is a perspective view of an embodiment of a clamp according to the invention, denoted as a whole by reference numeral 100. FIG. In figure 1 a connecting bolt 101 for an electrical apparatus is shown below the terminal 100, which is provided with an external thread 102. Only part of a housing 103 of the electrical apparatus is shown and indicated schematically with a line. The connecting bolt 101 is passed through the housing 103 and insulated from the housing 103 with insulators 106,107. In a specific exemplary embodiment, the electrical apparatus is a transformer and the housing 103 is accordingly the transformer housing. In particular, in a specific exemplary embodiment, it can be the low-voltage side of a transformer that is equipped with bushings according to DIN EN 50386. However, the invention is not limited to this type of connecting bolt, but rather can also be applied to other types of threaded bolts to which electrical lines are to be connected.

Im Betrieb des Transformators ist es notwendig elektrische Leitungen an den Anschlussbolzen 101 anzuschließen. In der Regel geschieht dies mit Schraubklemmen, die einen elektrischen Kontakt mit niedrigem Kontaktwiderstand und hoher Stromtragfähigkeit zwischen dem Anschlussbolzen und den anzuschließenden Leitungen herstellen.When the transformer is in operation, it is necessary to connect electrical lines to the terminal bolt 101. This is usually done with screw terminals that create an electrical contact with low contact resistance and high current carrying capacity between the terminal bolt and the lines to be connected.

Die vorgeschlagene Klemme 100 weist einen Klemmenkörper 108 auf, der im Wesentlichen quaderförmig ausgebildet ist. Der Klemmenkörper 108 umfasst demgemäß eine erste Hauptfläche 109a und eine gegenüberliegende zweite Hauptfläche 109b. Außerdem weist der Klemmenkörper 108 eine dritte Hauptfläche 109c auf, die in Figur 1 oben liegt sowie eine vierte Hauptfläche 109d, die der dritten Hauptfläche 109c gegenüberliegt.The proposed clamp 100 has a clamp body 108 which is essentially cuboid. Accordingly, the clamp body 108 comprises a first main surface 109a and an opposite second main surface 109b. In addition, the clamp body 108 has a third main surface 109c, which is figure 1 is on top and a fourth main surface 109d which is opposite to the third main surface 109c.

Ein erstes in der ersten Hauptfläche 109a zentral angeordnetes Gewindeloch 111 reicht von der ersten Hauptfläche 109a zu der zweiten Hauptfläche 109b. Ein zweites Gewindeloch 112 reicht von der dritten Hauptfläche 109c zu der vierten Hauptfläche 109d und ist ebenfalls zentral in der Mitte der dritten bzw. vierten Hauptfläche angeordnet. Demgemäß kreuzen sich das erste und das zweite Gewindeloch 111,112 im Zentrum des Klemmenkörpers 108. Die Innengewinde der Gewindelöcher 111,112 passen zu dem Außengewinde 102 des Anschlussbolzens 101.A first threaded hole 111 centrally located in the first main surface 109a extends from the first main surface 109a to the second main surface 109b. A second threaded hole 112 extends from the third main surface 109c to the fourth main surface 109d and is also centrally located in the middle of the third and fourth main surfaces, respectively. Accordingly, the first and second threaded holes 111, 112 intersect in the center of the clamp body 108. The internal threads of the threaded holes 111, 112 match the external thread 102 of the connecting bolt 101.

Zu beiden Seiten des ersten Gewindelochs sind jeweils ein durchgehender erster und zweiter Leiterkanal 113, 114 angeordnet. Die Leiterkanäle 113 und 114 erstrecken sich somit von der ersten Hauptfläche 109a zu der zweiten Hauptfläche 109b. In der dritten Hauptfläche 109c ist ein Gewindeloch 116 vorgesehen, dass in den ersten Leiterkanal 113 mündet und das eine Druckschraube 117 aufnimmt. Mit der Druckschraube 117 ist es folglich möglich, einen in den Leiterkanal 113 eingeführten Leiter in dem Klemmenkörper 108 festzuklemmen. In entsprechender Weise ist in der dritten Hauptfläche 109c ein Gewindeloch 118 vorgesehen, das in den zweiten Leiterkanal 114 mündet und das eine Druckschraube 119 aufnimmt, mit der ein in den Leiterkanal 114 eingesteckter Leiter in dem Klemmenkörper 108 festklemmbar ist.A continuous first and second conductor channel 113, 114 are arranged on both sides of the first threaded hole. The conductor channels 113 and 114 thus extend from the first main surface 109a to the second main surface 109b. A threaded hole 116 is provided in the third main surface 109c, which opens into the first conductor channel 113 and which accommodates a pressure screw 117 . It is consequently possible with the pressure screw 117 to clamp a conductor inserted into the conductor channel 113 in the terminal body 108 . In a corresponding manner, a threaded hole 118 is provided in the third main surface 109c, which opens into the second conductor channel 114 and which accommodates a pressure screw 119, with which a conductor inserted into the conductor channel 114 can be clamped in the terminal body 108.

In dem zweiten zentralen Gewindeloch 112 ist eine weitere Druckschraube 121 eingeschraubt, deren Funktion im Zusammenhang mit Figur 2 erläutert wird.In the second central threaded hole 112, another pressure screw 121 is screwed, its function in connection with figure 2 is explained.

Figur 2 zeigt die auf den Anschlussbolzen 101 aufgeschraubte Klemme 100. Der Anschlussbolzen 101 ist dabei in das zweite zentrale Gewindeloch 112 so weit eingeschraubt, dass der Anschlussbolzen 101 ungefähr bis in die Mitte des erste zentralen Gewindelochs 111 hineinragt. Die Druckschraube 121 ist von der dritten Hauptfläche 109c her gegen den Anschlussbolzen 101 in das zweite zentrale Gewindeloch 112 eingeschraubt, sodass die Stirnflächen von dem Anschlussbolzen 101 und der Druckschraube 121 gegeneinander gepresst sind und dabei den Klemmenkörper 108 mit dem Anschlussbolzen 101 mechanisch verspannen und gleichzeitig einen guten elektrischen Kontakt zwischen Klemmenkörper 108 und Anschlussbolzen 101 herstellen. Bei der vorgeschlagenen Klemme 100 genügt somit eine einzige Druckschraube 121, um den Kontaktdruck zu erzeugen und eine mechanische Verspannung auf dem Anschlussbolzen zu erzielen. figure 2 shows the terminal 100 screwed onto the connection bolt 101. The connection bolt 101 is screwed into the second central threaded hole 112 to such an extent that the connection bolt 101 protrudes approximately to the middle of the first central threaded hole 111. The pressure screw 121 is screwed from the third main surface 109c against the connection bolt 101 into the second central threaded hole 112, so that the end faces of the connection bolt 101 and the pressure screw 121 are pressed against one another and thereby mechanically brace the terminal body 108 with the connection bolt 101 and at the same time Establish good electrical contact between terminal body 108 and connecting bolt 101. In the case of the proposed terminal 100, a single pressure screw 121 is therefore sufficient to generate the contact pressure and achieve mechanical bracing on the connecting bolt.

Das erste zentrale Gewindeloch 111 ermöglicht dabei eine Sichtkontrolle durch eine Montageperson, um zu überprüfen, ob die Klemme 100 weit genug oder zu weit auf den Anschlussbolzen 101 aufgeschraubt ist.The first central threaded hole 111 enables an assembly person to carry out a visual inspection to check whether the clamp 100 has been screwed onto the connection bolt 101 far enough or too far.

Die Innenseiten der Leiterkanäle 113,114 weisen einen Bereich auf, der mit Längsrippen 122 als Oberflächenstruktur versehen ist. Bei dem in Figur 2 dargestellten Ausführungsbeispiel haben die Längsrippen 122 einen Dreiecks förmigen Querschnitt. Bei anderen Ausführungsbeispielen können auch andere Querschnittsformen gewählt sein. Die Bereiche mit der Oberflächenstruktur liegen in den Leiterkanälen 113,114 auf der Seite, die der Seite gegenüberliegt, wo die Druckschraube 117 bzw. 119 in den Leiterkanal 113 bzw. 114 eintritt. Bei der Montage eines Leiters presst daher die Druckschraube 117 bzw. 119 den Leiter gegen die entsprechende Oberflächenstruktur aus den Längsrippen 122, die eine möglicherweise vorhandene Oxidschicht auf dem Leiter aufbrechen und auf diese Weise die Herstellung eines guten elektrischen Kontaktes begünstigen. Solche störende isolierende Oxidschichten treten beispielsweise bei Leitern aus Aluminium oder Aluminiumlegierungen auf.The insides of the conductor channels 113, 114 have an area that is provided with longitudinal ribs 122 as a surface structure. At the in figure 2 illustrated embodiment, the longitudinal ribs 122 have a triangular cross-section. In other exemplary embodiments, other cross-sectional shapes can also be selected. The areas with the surface structure are in the conductor channels 113,114 on the side opposite to the side where the pressure screw 117 or 119 enters the conductor channel 113 or 114, respectively. When mounting a conductor, the pressure screw 117 or 119 therefore presses the conductor against the corresponding surface structure of the longitudinal ribs 122, which break up any oxide layer that may be present on the conductor and in this way promote the establishment of a good electrical contact. Such disturbing insulating oxide layers occur, for example, in conductors made of aluminum or aluminum alloys.

In Figur 3 ist eine perspektivische Ansicht der auf dem Anschlussbolzen 101 montierten Klemme 100 dargestellt. In der Klemme 100 sind 2 Leiter 301 und 302 montiert die durch kurze Leiterabschnitte veranschaulicht sind. Ein Pfeil V deutet in Figur 3 eine vertikale Richtung an, während ein Pfeil H eine horizontale Richtung anzeigt. Diese Konvention soll für alle Figuren gelten. Bei der dargestellten Montage sind die Leiterkanäle 113,114 in horizontaler Richtung orientiert und gestatten dadurch eine einfache Montage von horizontal verlaufenden Leitungen 301,302.In figure 3 1 is a perspective view of terminal 100 mounted on terminal stud 101. FIG. Two conductors 301 and 302 are mounted in the terminal 100 and are illustrated by short conductor sections. An arrow V points to figure 3 indicates a vertical direction, while an arrow H indicates a horizontal direction. This convention shall apply to all figures. In the assembly shown, the conductor channels 113, 114 are oriented in the horizontal direction and thereby allow a simple assembly of lines 301, 302 running horizontally.

In Figur 4 ist im Gegensatz zu Figur 3 die Klemme 100 mittels des ersten zentralen Gewindelochs 111 auf den Anschlussbolzen 101 aufgeschraubt, sodass sich die Leiterkanäle parallel zu dem Anschlussbolzen 101 erstrecken und damit eine einfache Montage von in vertikaler Richtung verlaufenden Leitungen 301, 302 ermöglichen. Die horizontalen bzw. vertikalen Anschlussmöglichkeiten der Leitungen 301, 302 werden folglich mit ein und derselben Klemme 100 erreicht, die lediglich in zwei unterschiedlichen Orientierungen auf den Anschlussbolzen aufgeschraubt wird. Durch die vorgeschlagene Klemme entfällt somit die Notwendigkeit unterschiedliche Klemmen vorzuhalten, um Kabel in unterschiedlichen Orientierungen bezüglich des Anschlussbolzens anzuschließen.In figure 4 is in contrast to figure 3 the clamp 100 is screwed onto the connecting bolt 101 by means of the first central threaded hole 111, so that the conductor channels extend parallel to the connecting bolt 101 and thus enable lines 301, 302 running in the vertical direction to be easily installed. The horizontal and vertical connection options for the lines 301, 302 are consequently achieved with one and the same clamp 100, which is only screwed onto the connection bolt in two different orientations. The proposed clamp thus eliminates the need to keep different clamps in order to connect cables in different orientations with respect to the connection bolt.

Figur 5 zeigt die auf den Anschlussbolzen 101 montierte Klemme 100, wobei die Leiterkanäle 113, 114 wie in Figur 3 horizontal orientiert sind. Bei dieser Orientierung ist der Anschlussbolzen in das zweite zentrale Gewindeloch 112 eingeschraubt Bei dem in Figur 5 dargestellten Ausführungsbeispiel ist in das erste zentrale Gewindeloch 111 ein Kugelbolzen 501 eingeschraubt, um weitere Anschlussmöglichkeiten für zusätzliche Leitungen zu schaffen. figure 5 shows the terminal 100 mounted on the connection bolt 101, with the conductor channels 113, 114 as in figure 3 are oriented horizontally. In this orientation, the connecting bolt is screwed into the second central threaded hole 112 figure 5 illustrated embodiment, a ball stud 501 is screwed into the first central threaded hole 111 in order to create further connection options for additional lines.

Figur 6 zeigt die auf den Anschlussbolzen 101 montierte Klemme 100, wobei die Leiterkanäle 113,114 wie in Figur 4 vertikal orientiert sind. Bei dieser Orientierung ist der Anschlussbolzen in das zweite zentrale Gewindeloch 112 eingeschraubt. Bei dem in Figur 6 dargestellten Ausführungsbeispiel ist in das zweite zentrale Gewindeloch 111 ein Kugelbolzen 501 eingeschraubt, um weitere Anschlussmöglichkeiten für zusätzliche Leitungen zu schaffen. figure 6 shows the terminal 100 mounted on the connecting bolt 101, with the conductor channels 113, 114 as in figure 4 are oriented vertically. With this orientation, the connecting bolt is screwed into the second central threaded hole 112 . At the in figure 6 illustrated embodiment, a ball stud 501 is screwed into the second central threaded hole 111 in order to create further connection options for additional lines.

Ein Vergleich zwischen den Figuren 5 und 6 zeigt, dass der zusätzliche Kugelbolzen 501 stets eine horizontale Orientierung hat, wenn der Anschlussbolzen eine vertikale Orientierung aufweist, weil das freie zentrale Gewindeloch in diesem Fall immer horizontal orientiert ist.A comparison between the Figures 5 and 6 Fig. 5 shows that the additional ball stud 501 always has a horizontal orientation when the connecting stud has a vertical orientation, because the free central threaded hole is always oriented horizontally in this case.

Bei den in der Zeichnung dargestellten Ausführungsbeispielen kontaktieren die Druckschraube in 117, 119 die angeschlossenen Leiter unmittelbar. Bei anderen Ausführungsbeispielen können jedoch auch bewegliche Druckstücke vorgesehen sein, die von der Druckschraube auf den Leiter gepresst werden, um den elektrischen Kontakt herzustellen.In the exemplary embodiments illustrated in the drawing, the pressure screw in 117, 119 makes direct contact with the connected conductors. In other exemplary embodiments, however, movable pressure pieces can also be provided, which are pressed onto the conductor by the pressure screw in order to establish the electrical contact.

Die vorgeschlagene Klemme kann zum Beispiel aus Kupfer, Aluminium und deren Legierungen sowie anderen elektrisch gut leitenden Metallen und deren Legierungen hergestellt sein.The proposed terminal can be made, for example, from copper, aluminum and their alloys and other electrically highly conductive metals and their alloys.

Bei einem weiteren Ausführungsbeispiel der Klemme ist die angeschlossene Leitung nicht unmittelbar mit einer Druckschraube festgeklemmt, sondern in der Klemme ist ein bewegliches Druckteil in dem Leiterkanal vorgesehen. Die so ausgestaltete Klemme kann bei bestimmten Leiterdurchmessern oder bestimmten Querschnittsformen des Leiters Vorteile gegenüber dem unmittelbaren Kontakt mit der Druckschraube haben. Bezugszeichenliste 100 Klemme 116 Gewindeloch 101 Anschlussbolzen 117 Druckschraube 102 Außengewinde 118 Gewindeloch 103 Gehäuse 119 Druckschraube 106,107 Isolatoren 121 Druckschraube 108 Klemmenkörper 122 Rillen 109a erste Hauptfläche 109b zweite Hauptfläche 301 Leiter 109c dritte Hauptfläche 302 Leiter 109d vierte Hauptfläche 501 Kugelbolzen 111 erstes zentrales Gewindeloch 112 zweites zentrales Gewindeloch 113 erster Leiterkanal 114 zweiter Leiterkanal In a further embodiment of the clamp, the connected line is not clamped directly with a pressure screw, but a movable pressure part is provided in the conductor channel in the clamp. With certain conductor diameters or certain cross-sectional shapes of the conductor, the terminal designed in this way can have advantages over direct contact with the pressure screw. <u>Reference List</u> 100 clamp 116 threaded hole 101 connection bolt 117 pressure screw 102 external thread 118 threaded hole 103 housing 119 pressure screw 106,107 insulators 121 pressure screw 108 clamp body 122 grooves 109a first main surface 109b second main surface 301 ladder 109c third main surface 302 ladder 109d fourth major surface 501 ball stud 111 first central threaded hole 112 second central threaded hole 113 first conductor channel 114 second conductor channel

Claims (6)

  1. A terminal for connecting a conductor (301, 302) to a connecting bolt (101) of an electrical apparatus, which is provided with an external thread (102), wherein the terminal has a conductor channel (113, 114) and a threaded hole (116, 118) for receiving a pressure screw, and wherein the threaded hole (116, 118) for receiving the pressure screw is oriented perpendicular to the axis of the conductor channel (113, 114), characterized in that the terminal (100) has a first and a second threaded hole (111, 112), which cross each other perpendicularly, wherein the internal thread of the first and of the second threaded hole (111, 112) match the external thread (102) of the connecting bolt (101), so that the terminal can be screwed onto the connecting bolt (101) in two different orientations, that the conductor channel runs along an axis, which is parallel to an axial direction of the first threaded hole, and that the terminal has a second pressure screw (121), which is screwed into the same threaded hole as the connecting bolt (101), but in the opposite direction as the connecting bolt.
  2. The terminal according to claim 1, characterized in that the conductor channel (113, 114) has grooves (122) and/or projections.
  3. The terminal according to claim 1 or 2, characterized in that the terminal has several, in particular, two, parallel conductor channels (113, 114).
  4. The terminal according to claim 3, characterized in that the conductor channels (113, 114) are arranged to the left and right of the first or the second threaded hole (111, 112).
  5. The terminal according to any one of the preceding claims, characterized in that the first and the second threaded hole (111, 112), which cross each other perpendicularly, in each case are arranged centrally in a main surface (109a, 109b, 109c, 109d) of a terminal body (108) of the terminal.
  6. An electrical apparatus with a connecting bolt, onto which a terminal is screwed according to any one of the preceding claims.
EP18306158.9A 2018-09-03 2018-09-03 Connection terminal and electrical apparatus Active EP3618191B1 (en)

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US16/555,440 US10923838B2 (en) 2018-09-03 2019-08-29 Connecting terminal and electrical apparatus

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US4213669A (en) * 1978-09-11 1980-07-22 Gte Sylvania Wiring Devices Incorporated Terminal collar
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