EP2923416B1 - Device for the electrical attachment or connection of at least one conductor of an energy supply cable - Google Patents

Description

The invention relates to a device for electrically connecting or connecting at least one conductor of a power supply cable having the features in the preamble of claim 1.

In some installations for connecting electrical cables, branching electrical cables, or even connecting cables to electrical equipment, the cables are already immovable at a distance of several tens of centimeters from the connection or connection, for example, when the cables are buried in the ground and only one socket hole is exposed for installation of the connection or the connection or if, for example, the outer insulation or reinforcement of a multiphase cable must be discontinued, if the individual cable wires are to be connected to the same or other wires. In these cases, the cable core can only be bent laterally when installing connection, branch or connection elements.

For this application, for example, so-called through-connectors are known, which after cutting and aligning the cable conductors to be connected to each other via a cable conductor end in a so-called Parking position are pushed and pushed back to the congruent alignment of the cable ladder to be connected to each other in the center position. This method has the disadvantage that the insulation on the cable core with the parking position further set down and later must be replicated from the socket insulation or that the inner diameter of the connector sleeve must be large enough to accommodate the cable conductor, including its isolation. In many types of cable fittings, this oversizing is not possible due to space and cost reasons.

Therefore, divisible connectors are known from the prior art, in which connecting elements are clamped transversely to the cable axis. In a first assembly step, the connecting elements are mounted at the ends of the cable ladder to be connected, for example by means of sleeve-shaped screw connectors which receive the cable ladder and are permanently clamped to the sleeves by pressure screws arranged transversely to the longitudinal axis. In a second assembly step, the pre-assembled on the conductors fasteners are interconnected. The cable cores should be bent out as little as possible in order to prevent unintentional loosening of the conductor connections.

From the DE 602 15 756 T2 For example, a connector as well as an electrical device with the connector is known.

From the GB 138 940 A An improved connector for electrical cables or wires is known.

From the DE 94 08 004 U1 a compression cable lug is known for an end closure for plastic-insulated medium voltage cables.

From the GB 2 319 402 A is a two-piece connector for conductors known. Due to the contact elements of the two connecting elements predetermined contact surfaces, the cables to be joined together when connecting the two connecting elements must be more or less rotated in order to achieve a surface contact of the contact elements of the connecting elements. There is a risk that the connection between the connecting element to be rotated and the conductor mounted thereon loosens again due to the mechanical stress associated with the rotation. This is increasingly true in cramped space and low free cable lengths.

The US 4,458,976 describes a device for electrically connecting or connecting at least one conductor of a power supply cable, wherein the device has a connectable to the conductor first connecting element which is connectable by means of a clamping element with a second connecting element of the device, and wherein the two connecting elements in each case at least partially a cylindrical, in particular have a circular cylindrical peripheral surface and a centric longitudinal axis in this respect, wherein one of the two connecting elements has a pin-shaped first contact member with an at least partially circular cylindrical and concentric with the central longitudinal axis of one of the two connecting elements first contact surface, wherein the other of the two connecting elements has a receiving opening, via which the first contact member eccentric to the central longitudinal axis of the other of the two connecting elements in the other of two connecting elements can be inserted and when connecting the connecting elements by the clamping element concentric with the central longitudinal axis of the other of the two connecting elements aligned and thereby brought into electrically connecting contact with a second contact surface of a second contact member of the other of the two connecting elements, so that in the connected state aligned central longitudinal axes of the two connecting elements. The receiving opening is provided in the form of a groove.

Other devices for electrically connecting or connecting at least one conductor of a power supply cable go out of the FR 2 662 846 A1 and the EP 1 206 024 A1 out.

The invention is based on the problem to provide a generic device, which has further improved performance characteristics. In one embodiment, the assembly of the device should be further simplified while still ensuring a permanently good electrical connection.

In one embodiment of the invention, the problem is solved by the device defined in claim 1. Particular embodiments of the invention are defined in the subclaims.

According to the characterizing part of claim 1, it is provided that the circular, end-side receiving opening having an undercut forms the second contact element in the second connecting element and has a longitudinal axis which runs parallel but offset relative to the second central longitudinal axis of the second connecting element.

In one embodiment, the device has a first connecting element which can be connected to the conductor and which can be connected to a second connecting element of the device by means of a clamping element. The two connecting elements each have, at least in sections, a cylindrical, in particular a circular cylindrical peripheral surface and a centric longitudinal axis with respect thereto. In particular, the two connecting elements have congruent circular-cylindrical sections at or near their mutually facing ends, so that in the connected state the two connecting elements abut one another substantially without heels.

One of the two connecting elements has a pin-shaped first contact member with a in the direction of the central longitudinal axis and / or in the circumferential direction about the central longitudinal axis at least partially circular cylindrical and concentric with the central longitudinal axis concentric first contact surface on the connecting the connecting elements through the clamping element in electrically connecting system a second contact surface of a sleeve-shaped second contact element of the other of the two connecting elements can be brought. The second contact surface may also be at least partially circular cylindrical. Alternatively or additionally, however, the second contact surface may also be polygonal in cross-section or may also be formed by contact webs which may extend parallel to the central longitudinal axis.

The other of the two connecting elements has a receiving opening, via which the first contact member eccentrically to the central longitudinal axis of the other of the two connecting elements in the other of the two connecting elements is inserted and when connecting the connecting elements by the clamping element concentric with the central longitudinal axis of the other of the two connecting elements can be aligned, in particular in the radial direction with respect to the central longitudinal axis is displaceable, and thereby in electrically connecting contact with a second contact surface of a second contact member of the other of the two connecting elements can be brought so that in the connected state, the central longitudinal axes of the two connecting elements are aligned. As a result, the two connecting elements at the connection point are essentially free of heels in an optional rotational position relative to one another, relative to the central longitudinal axis, can be connected to one another.

The concrete shape or cross-sectional shape of the second contact surface is not critical for many applications. On the other hand, it is more important that the second contact surface, taking into account the radial extent of the at least partially circular cylindrical contact surface of the first contact surface Contact member is arranged on the contact member such that in the connected state, the central longitudinal axes of the two connecting elements are aligned. Upon rotation of the connecting element with the first contact member about the central longitudinal axis, the first contact member remains in electrically connecting contact with the second contact member. If the second contact surface is formed, for example, by contact webs extending parallel to the central longitudinal axis, the surfaces of the contact webs facing the first contact element lie on a circular path concentric with the central longitudinal axis.

This makes it possible to connect the two connecting elements in a rotational position with each other, which is freely selectable with respect to the central longitudinal axis of an angular range, which is predetermined by the extent of the circular cylindrical portion of the first contact member in the circumferential direction. The angle range can also be less than 360 °, for example when the circular cylindrical portion extends in the circumferential direction only over an angular range of less than 360 °, for example over a range of more than 90 ° and less than 180 °, which is already sufficient for many applications may be, for example, when the device is arranged in a socket hole, which is anyway accessible only from above or from one side, so that the clamping element can be operated only from above or from one side.

In a preferred embodiment, the circular cylindrical portion extends in the circumferential direction over 360 °, in particular, the first contact member at least in the first contact surface forming portion in cross-section circular. In this case, the two connecting elements can be brought together and connected to one another in a rotational position which is optional from an angle range of 360 °. This offers the advantage that when connecting the two connecting elements, the connection point between one of the connecting elements and the conductor connected thereto is not claimed. This is not just the Assembly simplified, but it is also a durable and good electrical connection is guaranteed. This is particularly advantageous when connecting cables with sector conductors or stranded conductors, as used for example in power supply cables in the low voltage range up to 1000 V AC.

The fact that in the connected state, the central longitudinal axes of the two connecting elements are aligned with each other, and the at least partially cylindrical peripheral surfaces of the two connecting elements can be aligned, in particular at the transition point of the two connecting elements. This is particularly advantageous in devices according to the invention for use in the medium voltage range for voltages of more than 1000 V AC voltage, because then unwanted field strength peaks can be prevented.

In one embodiment, the device can be used for connecting or connecting conductors with a cross section of more than 10 mm ² , in particular for conductor cross sections up to 2000 mm ² or even 3000 mm ² .

In one embodiment, the sleeve-shaped second contact member, for example, has a longitudinal axis that runs parallel but offset relative to the central longitudinal axis of the other of the two connecting elements. The clear width of the second sleeve-shaped contact member may be greater than the outer diameter of the first contact member. As a result, the insertion of the first contact member is simplified in the second contact member, in particular when the two connecting elements are pivoted to each other during assembly.

The second contact member may be made by a blind hole in the other of the two connecting elements, but have a deviating from the circular cross-section. In particular, the second contact member may be separated from a receiving space of a on the another of the two connecting elements connectable electrical conductor, in particular the conductor of another cable. As a result, a so-called oil barrier is realized, for example, compared to the known from the prior art through-connectors, which allows, for example, to connect an oil or earth-saturated cable ladder with a plastic-insulated cable ladder.

In one embodiment, the clamping element when connecting the connecting elements in clamping engagement with a clamping surface of the first contact member can be brought, in particular to a also the first contact surface forming circular cylindrical surface of the first contact member. If the device has only one clamping element, the clamping element when connecting the connecting elements in clamping engagement with one of the first contact surface opposite clamping surface of the first contact member can be brought. The device may also have a plurality of clamping elements, in particular at least two clamping elements spaced around each other in the circumferential direction about the central longitudinal axis. This can be applied in a simple manner by the clamping element, a first contact surface against the second contact surface pressing clamping force. The clamping element may, for example, have a planar clamping surface which can be brought into abutment with the circular-cylindrical section of the first contact element and in which case a substantially linear contact area extending parallel to the central longitudinal axis is formed.

The second contact surface may be formed by a circular cylindrical portion of the second contact member, in particular when a single electrical line contact is sufficient or desired. Alternatively, the second contact surface may be formed by a substantially V-shaped portion of the second contact member, on the two legs of the first contact surface of the first contact member is engageable and each forms an electrical line contact.

In one embodiment, the clamping element via at least one of the second contact surface preferably opposite opening in the other of the two connecting elements in clamping engagement with the first contact member can be brought, in particular the clamping element via a second contact surface preferably opposite threaded hole in the other of the two fasteners can be screwed. This ensures that the first contact member is arranged in the connected state of the connecting elements between the clamping element and the second contact surface and can be brought and retained by the clamping element to the second contact surface in contact-making and clamping contact.

The clamping element may be formed by a tear-off screw, which tears at or near the opening of the connecting element upon reaching a required clamping force corresponding torque, so that in the demolished state, the clamping element is substantially flush with the surrounding surface of the connecting element.

In one embodiment, at least one of the two contact elements, for example, an inclined or curved to the direction of a tensile stress on the two connecting elements extending contact surface, to which the other of the two contact members when connecting the two connecting elements in abutment and can be preserved by the clamping element and thereby the connected state of the two connecting elements is positively locked and secured against a tensile stress on the two connecting elements. The contact surface can also form the current-carrying contact region or at least be part of the current-carrying contact region. An abutment surface running obliquely or curved to the longitudinal axis of the connecting element also offers the advantage that, when the radially acting clamping element is actuated, the two connecting elements can be moved axially relative to one another by the obliquely extending abutment surface, for example completely System can be brought together, or at least be placed under axial tension, for example, to secure a complete system of the connecting elements to each other.

The contact surface can be formed for example by an undercut and / or by a recess in the one of the two contact members. Alternatively or additionally, the contact surface can also be formed by an example circumferential groove or a suitable recess in one of the two contact members. When connecting the two connecting elements engages the other of the two contact members in the undercut, the recess or the like and is clamped by the clamping element in the engaged position. The undercut may be formed, for example, by a shoulder-shaped or cone-shaped transition from a first to a second cylindrical or hollow cylindrical portion, for example, the first contact member may be formed by a circular cylindrical portion having a first diameter, to which in the direction of the free end a second , in particular likewise circular-cylindrical section with a second diameter, wherein the second diameter is greater than the first diameter. Alternatively or additionally, the second contact member may have a first clear width having first hollow cylindrical portion, which is followed by a second hollow cylindrical portion with a second clearance in the direction of the first contact member, wherein the second clear width is less than the first clear width ,

In one embodiment, at least one of the two connecting elements has a receiving opening for the conductor to be defined therein, which can also be referred to as a clamping channel. The cross section of the receiving opening may deviate from a circular path, in particular it may be adapted to the conductor. Transverse to the receiving opening can preferably over the entire length of the receiving opening evenly distributed or at least partially, in particular with respect to or Clamping screws and / or attached to the front side of the receiving opening, grooves or cutting, which reduce the bearing surface between the conductor and the connecting element so far that due to the maximum of the terminal screws providable lateral forces the electrical and mechanical contact behavior of the conductor is improved to the connecting element.

The conductor can be fixed by at least one clamping screw, preferably by a plurality of clamping screws screwed into the connecting element and in particular transversely to the central longitudinal axis, preferably by at least one and preferably several tear-off screws which tear off at the conductor clamping operation at or near the surface of the surrounding connecting element.

The receiving opening for the conductor can connect in the axial direction of the connecting element to the respective contact member with a distance. The receiving opening can be designed as a blind hole or blind hole. The receiving opening may extend over more than 40%, in particular more than 55% and preferably more than 65% of the axial length of the connecting element. By means of threaded bores extending transversely to the receiving opening and reaching through to the receiving opening, two or more clamping screws can preferably be screwed into the connecting element.

In one embodiment, the receiving opening is eccentric, but preferably aligned parallel to the central longitudinal axis of the connecting element. The receiving opening has a clear width, which is greater than the maximum usable in the receiving opening conductor. This allows the use of the device not only for a single conductor cross section, but for a predetermined range of conductor cross sections. For example, one and the same device can be used for conductor cross sections between 50 and 240 mm ² .

The device preferably has at least one, for example, sleeve-shaped adjusting element which can be inserted, for example, into the receiving opening or fixed to the conductor and adapted in its dimension to the diameter of the conductor actually to be connected in such a way that the conductor fixed in the receiving opening substantially or approximately is arranged centrically to the longitudinal axis of the connecting element. This results in a further improvement in terms of avoiding field strength peaks, since the conductor is arranged coaxially to the central longitudinal axes of the connector element.

The connecting element may have at its end facing the conductor a curved or conical end portion with a continuous reduction of the outer diameter, so that the transition from the connecting element to the cable, in particular to the cable sheath, during assembly as smooth as possible and especially heel-free example, can be filled with insulating or with a semiconducting tape is wound. Depending on the design of the conductor to be clamped, for example round or sector-shaped, the cross-section of the conductor to be clamped and / or of the example dependent on the rated voltage Isolierwandstärke of the cable, it is advantageous for example in medium voltage applications, if the existing between the cable sheath and connecting element gap treated in the form described.

In one embodiment, the clamping screw for fixing the conductor in the connecting element on a matching with the clamping element for connecting the connecting elements tool engagement surface. As a result, the assembly is further simplified because both the clamping screw and the clamping element can be actuated with the same tool.

In one embodiment, the clamping screws for fixing the conductor in the connecting element and the clamping elements for connecting the Connecting elements formed in each case by Abreißschrauben, in particular by identical Abreißschrauben that demolish when pressed respectively at or near the surface of the surrounding connecting element. By using identical Abreißschrauben the assembly is further simplified because for all provided clamping screws and clamping elements a substantially matching Abreißverhalten is achieved, especially when the threaded hole in the connecting elements in terms of pitch, length and the like are consistent.

Preferably, at least a portion of the clamping screws and / or the clamping elements of a connecting element along the longitudinal axis of the compound is arranged in alignment one behind the other in a row, wherein the provided on a connecting element clamping screws and clamping elements can be arranged equidistantly. In devices with which even large conductor cross-sections of, for example, more than 200 mm ² , in particular more than 500 mm ² , are connected to each other, the clamping screws and / or clamping elements can also be circumferentially, with respect to the longitudinal axis of the connecting element, offset from one another.

With a device according to the invention, for example, the conductors of two cables can be connected to one another, wherein each connection element is mounted on the end of a conductor. Alternatively, one of the connecting elements may not be connected to a cable, but may be formed, for example, by a device connection, a connecting bolt or a cable lug of a cable end closure.

Fig. 1

zeigt eine Seitenansicht auf ein Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung;

Fig. 2

zeigt eine perspektivische Ansicht auf die beiden Verbindungselemente im noch nicht verbundenen Zustand;

Fig. 3

zeigt eine perspektivische Ansicht der zusammengesteckten Verbindungselemente;

Fig. 4

zeigt eine Seitenansicht auf das erste Verbindungselement;

Fig. 5

zeigt eine Draufsicht auf das erste Verbindungselement;

Fig. 6

zeigt eine Vorderansicht auf das erste Verbindungselement;

Fig. 7

zeigt eine Rückansicht auf das erste Verbindungselement;

Fig. 8

zeigt einen Schnitt durch das erste Verbindungselement entsprechend VIII-VIII der Fig. 5;

Fig. 9

zeigt eine Seitenansicht auf das zweite Verbindungselement;

Fig. 10

zeigt eine Draufsicht auf das zweite Verbindungselement;

Fig. 11

zeigt eine Rückansicht auf das zweite Verbindungselement;

Fig. 12

zeigt eine Vorderansicht auf das zweite Verbindungselement; und

Fig. 13

zeigt einen Schnitt durch das zweite Verbindungselement entsprechend XIII-XIII der Fig. 10.

Further advantages, features and details of the invention will become apparent from the subclaims and the following description, in which an embodiment is described in detail with reference to the drawings. It can in the claims and in the description mentioned features each individually by itself or in any combination essential to the invention.

Fig. 1

shows a side view of an embodiment of a device according to the invention;

Fig. 2

shows a perspective view of the two connecting elements in the not-connected state;

Fig. 3

shows a perspective view of the mated fasteners;

Fig. 4

shows a side view of the first connection element;

Fig. 5

shows a plan view of the first connecting element;

Fig. 6

shows a front view of the first connecting element;

Fig. 7

shows a rear view of the first connection element;

Fig. 8

shows a section through the first connecting element according to VIII-VIII of Fig. 5 ;

Fig. 9

shows a side view of the second connection element;

Fig. 10

shows a plan view of the second connecting element;

Fig. 11

shows a rear view of the second connection element;

Fig. 12

shows a front view of the second connecting element; and

Fig. 13

shows a section through the second connecting element according to XIII-XIII of Fig. 10 ,

The Fig. 1 shows a side view of an embodiment of a device 1 according to the invention for electrically connecting a first conductor 2 of a first cable 4 with a second conductor 6 of a second cable 8, wherein the device 1 is partially shown in the view and partially with indicated inner contours. The device 1 has a first connecting element 10 which can be connected to the first conductor 2 and a second connecting element 20 which can be connected to the second conductor 6. The two connecting elements 10, 20 each have, at least in sections, a cylindrical, in particular circular cylindrical peripheral surface 12, 22 and one with respect to FIG circular cylindrical peripheral surface 12, 22 centric longitudinal axis 14, 24.

The first connecting element 10 has a pin-shaped first contact element 16 with a first circular contact surface 18 concentric in sections in the direction of the first central longitudinal axis 14 and concentric with the first central longitudinal axis 14. The second connecting element 20 has a sleeve-shaped second contact member 26 formed by a receiving opening 40 with a second contact surface 28, wherein the second contact surface 28 in the embodiment at least over an angular range of more than 60 °, in particular more than 90 ° and preferably more than 120 ° in the circumferential direction with respect to the second central longitudinal axis 24 is circular cylindrical for a system of the first contact surface 18, wherein the radius of the circular cylindrical second contact surface 28 is greater than the radius of the circular cylindrical first contact surface 18th

The position of the second contact surface 28 in the second connecting element 20 is such that in the connected state, the central longitudinal axes 14, 24 of the two connecting elements 10, 20 are aligned with each other. As a result, for example, the first connecting element 10 in a rotational position, which is freely selectable with respect to a central longitudinal axis 14 from an angular range, which is determined by the extent of the circular cylindrical portion of the first contact member 16 in the circumferential direction, merges with the second connecting element 20 and in the selected rotational position with the second connecting element 20th get connected. For example, the radial distance of the partially circular cylindrical second contact surface 28 from the second central longitudinal axis 24 corresponds to the radius of the first contact surface 18 with respect to the first central longitudinal axis 14 of the first connecting element 10.

The first connecting element 10 has in its adjoining the first contact member 16 sleeve-shaped portion a receiving opening 32 in the form of a blind hole opening for the insertion of the first conductor 2. The inside width of the receiving opening 32 is larger than the diameter of the largest conductor 2 to be accommodated. The receiving opening 32 ends in the direction of the first longitudinal axis 14 before the transition of the sleeve-shaped section to the first contact member 16.

Radially with respect to the first longitudinal axis 14 are in the first connecting element 10 of the cylindrical peripheral surface 12 ago two threaded holes 60 (FIG. Fig. 2 The clamping screws 34 are formed as Abreißschrauben that tear when reaching the necessary clamping force for the required torque at or near the cylindrical peripheral surface 12. On the opposite side of the threaded holes 60, the receiving opening 32 has a provided for example with paragraphs and / or cutting transverse groove portion 36, through which the electrical contact and / or mechanical clamping between the first conductor 2 and the first connecting element 10 is improved. The receiving opening 32 may be made in particular as a bore, but in the circumferential direction sections of formations 76 ( Fig. 7 ) for adaptation to the cross-sectional shape of the largest, the connecting element 10 associated to be connected first conductor second

In a corresponding manner, the second connecting element 20 also has a receiving opening with a transverse groove section 42 and formations 78 (FIG. Fig. 11 ) for the second conductor 6 of the second cable 8, wherein this receiving opening is designed as a blind hole and in particular from the second contact member 26 forming opening is separated by a partition 38. In the receiving opening for the second conductor 6 associated sleeve-shaped portion are radially threaded holes 60 are introduced into the second connecting element 20, via which two clamping screws 34 are screwed for clamping the second conductor 6, which are also formed in the embodiment as tear-off screws. The distance between the clamping element 30 and the adjacent clamping screw 34 is consistent with the distance between the two clamping screws 34. The clamping element 30 and the clamping screws 34 are identical, so that this same parts can be used. In a corresponding manner, the threaded holes 60 for the clamping element 30 and the clamping screws 34 in the two connecting elements 10, 20 coincide.

The first contact element 16 adjoins the sleeve-shaped section of the first connecting element 10 through a first conical surface 44, which is adjoined by a first cylindrical section 46, which merges via a second conical surface 48 into the second cylindrical section 50 forming the first contact surface 18. In this case, the first cylindrical section 46 has a diameter which is smaller than the diameter of the second cylindrical section 50. The rounded end face facing the second connecting element 20 is adjoined by a rounded and in particular partially spherical surface 52 on the second cylindrical section 50 to which a third conical surface 54 up to a front side plan and preferably circular end face 56 connects, whose diameter is smaller than the diameter of the first cylindrical portion 46. As a result, the insertion of the first contact member 16 is simplified in the second contact member 26.

The Fig. 2 shows a perspective view of the two connecting elements 10, 20 in the not yet mated condition without the connected cables 4, 8 and without the clamping screws 34 and the clamping member 30. Die Fig. 3 shows a perspective view of the mating fasteners 10, 20, again without the first and second cables 4, 8, but with the screwed in a starting position in the two fasteners 10, 20 clamping screws 34 and the clamping member 30, a matching tool engagement surface 58 in Have a hexagon shape.

The Fig. 4 shows a side view of the first connecting element 10, the Fig. 5 shows a plan view, the Fig. 6 a front view and the Fig. 7 a rear view of the first connecting element 10. The Fig. 8 shows a section through the first connecting element 10 according to VIII-VIII of Fig. 5 ,

The front view of the Fig. 6 Circular second cylindrical portion 50, which forms on its peripheral surface, the first contact surface 18, is centered with respect to the cylindrical peripheral surface 12 of the first connecting member 10 centric first longitudinal axis 14. In contrast, the center axis 62 of the receiving opening 32 for the first conductor 2 a Offset to the first longitudinal axis 14, in particular, the receiving opening 32 is offset by, for example, 1 mm or a few mm in the direction away from the threaded hole 60 for screwing the clamping screws 34 direction. As a result, the wall thickness for the threaded bore 60 is greater than in the case of a connecting element 10 of the same outside diameter, whereby higher clamping forces for the conductor 2 can be realized without increasing the design.

The Fig. 9 shows a side view of the second connecting element 20 with indicated inner contours, the Fig. 10 shows a plan view, the Fig. 11 a rear view and the Fig. 12 a front view of the second connecting element 20. The Fig. 13 shows a section through the second connecting element 20 according to XIII-XIII of Fig. 10 ,

The front view of the Fig. 12 circular end face and an undercut receiving opening 40 in the second connecting element 20 forms, in particular by the undercut, a second contact member 26 and has a longitudinal axis 64 which is parallel but offset from the second central longitudinal axis 24 of the second connecting element 20. In particular, the longitudinal axis 64 of the second contact member 26 is displaced by the amount of, for example, 1 mm or a few mm in the direction of the threaded hole 60 for screwing the clamping member 30. The clear width 66 ( Fig. 13 ) of the second contact member 26 in its insertion portion may correspond to the diameter of the first contact member 16 in the second cylindrical portion 50, in particular only be less than 0.5 mm larger to allow insertion, or at least by the amount of displacement of the longitudinal axis 64 opposite the second central longitudinal axis 24 be greater than the diameter of the first contact member 16th

The receiving opening 40 forming the second contact element 26 has an undercut and forms a kind of blind hole in the second connecting element 20. From the axial end of the second connecting element 20, the receiving opening 40 initially has a first section 68 which has a conical surface or a curvature tapered to the clear width 66, which is a piece continued from a cylindrical second portion 70, which then extends over a cone surface 72 widens to a second at least partially cylindrical portion 74 which is radially broken with respect to the second longitudinal axis 24 in one direction from a threaded bore for the clamping member 30 and forms the second contact surface 28 on the opposite side.

The angle of the conical surface 72 may substantially coincide with the second conical surface 48 of the first contact member 16 and, for example, include an angle of 40 ° with the second longitudinal axis 24. Due to the conical surface 72, the two connecting elements 10, 20 can be moved towards each other in the axial direction by the tightening of the clamping element 30 due to the mutually corresponding contact of the conical surface 72 and the second conical surface 48 and thereby brought into flush contact with each other. Due to the alignment of the central longitudinal axes 14, 24 and the at least at the junction, preferably in total, matching cylindrical peripheral surfaces 12, 22, the two connecting elements are aligned in each rotational position and thereby form a favorable stepless outer contour. Preferably, the conductors 2, 6 of the cables 4, 8 are also aligned with the central longitudinal axes 14, 24.

The illustrated embodiment is provided for conductor cross sections between 50 mm ² and 240 mm ² . The length of the connecting elements 10, 20 is about 90 mm, the outer diameter is about 35 mm, the inside diameter of the receiving opening 32 for the conductors 2, 4 is about 21 mm and the diameter of the pin-shaped first contact member 16 is about 15 mm.

Claims (10)

1. A device (1) for the electrical attachment or connection of at least one conductor (2, 6) of an energy supply cable (4, 8), the device (1) having a first connection element (10) that can be connected to the conductor (2, 4) and that can be connected by means of a clamping element (30) to a second connection element (20) of the device (1), and the two connection elements (10, 20) each having, at least in some portions, a cylindrical, in particular a circular cylindrical circumferential face (12, 22) and a longitudinal axis (14, 24) centred in relation thereto, one of the two connection elements (10, 20) having a pin-like first contact component (16) with a first contact surface (18) that is circular cylindrical, at least in some portions, and concentric to the centric longitudinal axis (14) of one of the two connection elements (10), the other of the two connection elements (10, 20) having a receiving opening (40) via which the first contact component (16) can be introduced eccentrically to the centric longitudinal axis (24) of the other of the two connection elements (10, 20) into the other of the two connection elements (10, 20) and can be aligned by connecting the connection elements (10, 20) by means of the clamping element (30) concentrically to the centric longitudinal axis of the other of the two connection elements (10, 20) and can thus be brought into electrically connecting contact with a second contact surface (28) of a second contact component (26) of the other of the two connection elements (10, 20) so that in the connected state the centric longitudinal axes (14, 24) of the two connection elements (10, 20) are aligned, characterised in that the circular, front-side receiving opening (40) that has an undercut forms the second contact component (26) in the second connection element (20) and has a longitudinal axis (64) which runs parallel, but offset to the second centric longitudinal axis (24) of the second connection element (20).
2. The device (1) according to Claim 1, characterised in that the second contact surface (28) is disposed on the second contact component (26), taking into account the radial extension of the first contact surface (18), which is circular cylindrical at least in portions, of the first contact component (16) such that one of the two connection elements (10, 20) can be brought together with the other of the two connection elements (10, 20) in a rotary position which can be freely selected from an angle range in relation to its centric longitudinal axis (14, 24), which angle range is predetermined by the extension of the circular cylindrical portion of the first contact component (16) in the circumferential direction, and can be connected to the other of the two connection elements (10, 20) in the selected rotary position, maintaining the alignment of the centric longitudinal axes (14, 24) of the two connection elements (10, 20).
3. The device (1) according to Claim 1 or 2, characterised in that upon connecting the connection elements (10, 20) the clamping element (30) can be brought into clamping contact with a clamping surface of the first contact component (16), in particular with a circular cylindrical surface of the first contact component (16) also forming the first contact surface (18).
4. The device (1) according to Claim 1 or any of the preceding claims, characterised in that the at least one clamping element (30) can be brought via an opening in the other of the two connection elements (10, 20) preferably lying opposite the second contact surface (28) into clamping contact with the first contact component (16), in particular can be screwed into the other of the two connection elements (10, 20) via a threaded hole (60) preferably lying opposite the second contact surface (28).
5. The device (1) according to Claim 1 or any of the preceding claims, characterised in that at least one of the two contact components (16, 26) has a contact surface (48, 72) running obliquely to or curved with respect to the direction of a tensile load applied to the two connection elements (10, 20), with which contact surface the other of the two contact components (16, 26) can be brought into contact upon connecting the two connection elements (10, 20) and can be held by means of the clamping element (30), and in this way the connected state of the two connection elements (10, 20) is positively locked and is safeguarded against tensile loading of the two connection elements (10, 20).
6. The device (1) according to Claim 5, characterised in that the contact surface (48, 72) is formed by an undercut and/or a recess in one of the two contact components (16, 26), and that upon connecting the two connection elements (10, 20) the other of the two contact components (16, 26) engages in the undercut and/or the recess and is clamped by the clamping element (30) in the engaged position.
7. The device (1) according to Claim 1 or any of the preceding claims, characterised in that at least one of the two connection elements (10, 20) has a receiving opening (32) for the conductors (2, 6) to be fixed therein, and that the conductor (2, 6) can be fixed in the receiving opening (32) for the conductor (2, 6) to be fixed therein by means of at least one, preferably by a number of clamping screws (34) that can be screwed into the connection element (10, 20) obliquely, and in particular transversely to the longitudinal axis, preferably by means of at least one shear bolt which breaks off when manipulated so as to clamp the conductor (2, 6) on or near to the surface of the connection element (10, 20) surrounding it.
8. The device (1) according to Claim 7, characterised in that the receiving opening (32) for the conductor (2, 6) to be fixed therein is aligned eccentrically, but preferably parallel to the centric longitudinal axis (14, 24) of the connection element (10, 20).
9. The device (1) according to Claim 7 or 8, characterised in that the clamping screw (34) for fixing the conductor (2, 6) in the connection element (10, 20) has a tool engagement surface (58) corresponding to the clamping element (30) for connecting the connection elements (10, 20) so that the clamping screw (34) and the clamping element (30) can be manipulated with the same tool.
10. The device (1) according to any of Claims 7 to 9, characterised in that the clamping screw (34) for fixing the conductor (2, 6) in the connection element (10, 20) and the clamping element (30) for connecting the connection elements (10, 20) are formed by shear screws, in particular by identically constructed shear screws which break off upon manipulating the connection element (10, 20) surrounding them respectively on or close to the surface.

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