EP1345284A2 - Terminal for connecting an electrical conductor to a single bus bar - Google Patents

Abstract

The device has two clamp parts (4,5) clamped to the rail (3) by a lateral connecting element (6) when fitted. The first clamp part and connecting element are designed so that starting from a pre-assembly state in which the clamp parts are in loose contact with the rail, a pivoting motion of the first clamp part towards the rail is achieved in addition to clamping movement of at least this part towards the rail by operating the connecting element.

Description

The invention relates to a connection terminal for connecting an electrical Conductor on a single conductor rail, with a first clamping part and one second clamping part, which is in a fastening state with their respective Clamping surfaces over a side arranged next to the busbar Connection element are clamped to the power rail.

From the brochure sheet of Weber Control B.V., Coevorden, Netherlands, with the The title "Busbar systems 1250 - 1500 A" (1999 edition) is one electrical connection terminal for connecting electrical conductors to a Busbar known. The busbar is a so-called double bar trained and consists of two parallel and spaced from each other Flat rails with a rectangular cross-section. The connection terminal consists of essentially consisting of two U-shaped clamping parts, which have a threaded screw a hexagon head can be braced against each other. To the Attach terminal at any point along the power rail the lower clamping part and the upper clamping part from above and below on the End faces of the spaced-apart busbars, so that the legs of the u-shaped clamping parts each face the Grip the conductor rails to the side. The legs of the U-shaped clamping parts are in this mounting position facing each other. About the threaded screw two clamping parts moved towards each other and braced with the busbar and are thus in electrical contact with one another. For this, the Thread screw through a central hole in the upper clamping part between through the two parallel busbars into a central threaded hole in guided the lower clamping part. Between the top of the upper clamp and the hexagon screw head is either a Flat rail or a cable lug of a cable attached electrically conductive. There the clamping parts of the connection terminal symmetrical to the threaded screw are formed, the clamping forces can be applied equally to the two parallel ones Busbars are applied.

This terminal can also be used as a single rectangular flat rail trained busbars are used. In order to do so, however, the desired Clamping effect between the clamping parts on the now eccentric to the To achieve flat rail arranged screw, although only one Busbar is present between the now free clamping areas of the a U-shaped bracket inserted in both clamping parts. The bracket thus serves as a kind Abutment.

Since this terminal is basically for use on the front Electrical conductors are connected to double busbars, their assembly proves itself with simple busbars through the additional Temple as very expensive. Also the construction of the connection terminal itself too complicated by the bracket.

Proceeding from this, the present invention is based on the object of a simple connection terminal for connecting an electrical conductor to a to create individual busbars that are easy to install and at the same time good Contacting the busbar provides.

This task is accomplished by a connector for connecting an electrical Conductor on a busbar with the features of claim 1 solved. Advantageous embodiments of the invention are in claims 2 to 12 specified.

According to the invention, an electrical connection terminal is used for connecting of an electrical conductor on a single busbar, with a first Clamping part and a second clamping part, which are in a fastening state with their respective clamping surfaces via a laterally arranged next to the busbar Connection element are clamped to the busbar, achieved in that the first clamping part and the connecting element are designed such that starting from a pre-assembly state in which the clamping parts loosely on the Apply busbar by pressing the connecting element next to the Clamping movement of at least the first clamping part in the direction of the busbar a pivoting movement of the first clamping part in the direction of the busbar takes place. This results in an almost full-surface contacting of the contact surfaces of the clamping part and the busbar (here the clamping surface of the clamping part and reached the end face of the busbar. The essence of the present invention is seen in connection terminals in connection with individual busbars, the gaping of the contact surfaces of the clamping part and the busbar, which are caused by in relation to the conductor rail, eccentric force transmission via the Avoid connecting element on the clamping parts. This happens in the present invention in that the expected Swiveling of the clamping part through the eccentric introduction of force over the Connecting element is compensated for in that the contact surfaces of the Clamping part in relation to the connection surfaces of the connecting element below the swivel angle to be expected from the attachment to the clamping part is arranged. Thus, only after the clamping part has been fastened the pivoting according to the invention the desired full-area system Clamping surface of the first clamping part is reached on the end face of the busbar.

For the eccentric introduction of the clamping force, the connecting element can be one Have threaded bolts which are guided through a bore in the first clamping part is.

To the degree of the desired pivoting of the first clamping part at the Determine the fastening and an electrical conductor with the connection terminal To be able to connect, a connection surface for the electrical conductors arranged and the connection surface at an angle angle deviating from a right angle to the longitudinal axis of the bore in be aligned with the first clamping part.

In a preferred embodiment, the electrical conductor as a flat rail or as Cable end lug of a conductor to be formed, the one with the Threaded bolt cooperating threaded nut on the connection surface can be attached.

It can be particularly advantageous if the first and the second clamping part in the essentially L-shaped, each with a long leg and a short one To design legs with the facing each other in the attachment state Sides of the long legs arranged clamping surfaces, which in the Fasten condition on opposite sides of the busbar.

A particularly good electrical contact between the first clamping part and the Busbar can be reached if the busbar is used as a flat rail rectangular cross section and corresponding end faces and side faces is formed and the clamping surfaces of the first and Clamp the second clamping parts onto the end faces of the busbar. Another Improvement in electrical contact can be achieved if on the short legs and at right angles to the clamping surfaces connect that when attached to the side surface of the power rail issue.

With respect to one at right angles to the longitudinal axis of the connecting element aligned end face of the power rail, it can be of advantage Align the clamping surface of the first clamping part parallel to the connection surface.

The threaded bolt and the second can be particularly advantageous in terms of design To form the clamping part in one piece and the one opposite the threaded nut End of the threaded bolt in the short leg of the second clamping part to let pass

According to what is desired in connection with the present invention The effect of compensating the rotation of the clamping part when fastening is when attached, the inner wall of the hole at an angle to Longitudinal axis of the threaded bolt pivoted and the threaded bolt in the long leg opposite part of the inner wall pressed. Here self-locking of the clamp connection is also achieved. The The aforementioned angle can be in the range from 5 ° to 6 ° and is preferably 5 °.

It also follows from the essence of the present invention that in the Pre-assembly state of the first clamping part only in the area of its contact surface opposite end rests on the end face, the remaining part of the Clamping surface and the contact surface of the front or side surface of the Busbar are spaced. The inner wall of the bore runs here parallel to the longitudinal axis of the threaded bolt.

The first clamping part can preferably be a hot-pressed part made of copper be made. The adjacent outer surfaces of the first Clamping part that is at an angle different from a right angle aligned to each other, facilitate the release of the pressed part from the Tool.

Figur 1

eine perspektivische Ansicht einer erfindungsgemäßen Anschlussklemme in einem Befestigungszustand,

Figur 2

eine Seitenansicht von Figur 1,

Figur 3

eine Ansicht gemäß Figur 2 jedoch in einem Vormontagezustand vor dem Anziehen der Schraubverbindung der Anschlussklemme,

Figur 4

eine Ansicht von unten auf ein oberes erstes Klemmteil der Anschlussklemme gemäß Figur 2 und

Figur 5

eine Schnittansicht von Figur 4 entlang der Schnittlinie A-A.

The present invention is explained in more detail below on the basis of an exemplary embodiment shown in a drawing. Show it:

Figure 1

2 shows a perspective view of a connecting terminal according to the invention in a fastening state,

Figure 2

2 shows a side view of FIG. 1,

Figure 3

2 shows a view according to FIG. 2, however, in a pre-assembly state before tightening the screw connection of the connection terminal,

Figure 4

a bottom view of an upper first clamping part of the connection terminal according to Figure 2 and

Figure 5

a sectional view of Figure 4 along the section line AA.

Figure 1 shows a perspective view of an inventive Terminal 1 for connecting an electrical conductor 2 in Form a flat rail to a single flat busbar 3 the electrical conductor 2 and the busbar 3 each have a flat rectangular shape Cross section on. The busbar 3 (for example 40mm x 10mm) can Busbar in a control cabinet, not shown, for power distribution his.

The basic structure of the connection terminal 1 can be seen in FIG remove. Terminal 1 essentially consists of a first one upper clamping part 4 and a second lower clamping part 5, between which the Busbar 3 is clamped. The two clamping parts 4 and 5 are over a Connection element 6 clamped together. The first clamping part 4 is as Hot pressed part made of copper or a copper alloy. The Connecting element 6 is a threaded bolt 7 with a threaded nut 8 and one Washer 9 formed. The first clamping part shown in Figure 1 above 4 is essentially L-shaped or angled with a cross section Long leg 10 and a short leg 13 formed, on which free end of the long leg 10 and on the short leg 13 facing an approach 11 is arranged. The long leg 10 with his Clamping surface 12, the short leg 13 with its contact surface 14 and the neck 11 with its inner surface 15 delimit a groove-shaped recess 16, which for Recording the busbar 3 is used. For the assembly of connection terminal 1 the clamping part 4 with its recess 16 on the end face 17 of the busbar 3 postponed. When fastened, that is when tightened Connecting element 6, the contact surface 14 of the short leg 13 is on one of the two side surfaces 18 of the rectangular busbar 3, the clamping surface 12 of the long leg 10 on the end face 17 of the busbar 3 and the Inner surface 15 of the neck 11 on the other of the two side surfaces 18 of the Busbar 3 on.

On the side facing away from the busbar 3 and thus the clamping surface 12 the long leg 10 of the first clamping part 4 has a flat connection surface 19 for the electrical conductor 2 in the form of a flat rail. The flat rail is for this purpose provided at its free end with a bore, not shown which the threaded bolt 7 is carried out and the flat rail on the Washer 9 and the threaded nut 8 pressed onto the connection surface 19 becomes. Due to the flat support of the flat rail on the connection surface 19 good electrical contact is achieved. About the threaded nut 8 is also simultaneously the first clamping part 4 and the second clamping part 5 of opposite sides pressed against the busbar 3. In the first Clamping part 4 is a bore 20 for receiving the threaded bolt 7 arranged, starting from the connection surface 19 through the long leg 13 extends and the leg 13 at the connection surface 19 thereof leaves opposite free end (see Figure 5).

Corresponding to the first clamping part 4, the second clamping part 5 is essentially in relation to the attachment of the busbar 3 L-shaped and has a clamping surface 21 on the long leg 22 of the second clamping part 5, one Contact surface 23 on the short leg 24 and an inner surface 25 of one Approach 26, which limit a further recess 27. This recess 27 serves to accommodate the lower end face 17 opposite the upper End face 28 of the busbar 3. In the state of attachment, that is at tightened connecting element 6, the contact surface 23 of the short Leg 24 on one of the two side surfaces 18 of the rectangular busbar 3, the clamping surface 21 of the long leg 22 on the end face 28 of the Busbar 3 and the inner surface 25 of the extension 26. In the in FIG The illustrated embodiment is the threaded bolt 7 and the second Clamping part 5 formed in one piece in the form of a hammer head screw. Corresponding In a hammer head screw, the screw head is not L-shaped as previously described but T-shaped and thus has two in relation to the Threaded bolt 7 opposite long legs 22 each with one corresponding clamping surface 21. Unlike one In addition to the clamping surfaces 21, hammer head screws are also the approaches 26 is provided for guiding the busbar 3 on its side surface 18. On Such a second clamping part 5 can be used in conjunction with another first clamping part 4 also for a connection terminal 1 for double busbars be used. For the perfect technical function of the Terminal 1 according to the invention for individual busbars 3 is, however the L-shaped configuration of the second clamping part 5 is sufficient.

Figure 2 shows a side view of Figure 1 showing the position of the top first Clamping part 4 in relation to the busbar 3 after tightening the Connection element 6 thus shows in the attachment state. Here is the Connection surface 19 of the first clamping part 4, which is connected to the flat rail 3 trained conductor 3 is in contact, approximately at right angles to the longitudinal axis L of Connecting element 6 aligned. The clamping surface 12 of the first clamping part 4 approximately at right angles to the longitudinal axis L of the connecting element 6 and the contact surface 14 of the first clamping part 4 approximately parallel to the longitudinal axis L. of the connecting element 6. The transverse extent of the side surfaces 18 of the Busbar 3 also runs approximately parallel to the longitudinal axis L des Connection element 6. Thus, the clamping surface 12 and the contact surface 14 of the first clamping part 4 almost all over the end face 17 and Side surface 18 of the busbar 3. The pad 19 of the first Clamping part 4 is therefore parallel to the clamping surface 13 of the first clamping part 4 aligned (see also Figure 5).

Furthermore, it can be seen that the front surface 29 and the rear surface 30 according to the view of a first clamping part 4 according to Figure 1 in parallel run to each other, the adjacent and the front surface 29 and the However, connecting surface 19 connecting rear surface 30 does not run at right angles to the front surface 29 and the rear surface 30 but deviates by an angle a from about 5 ° to 6 °, preferably 5 °, from the rectangular position and increases thus from the front surface 29 to the rear surface 30. In FIG. 2 shown position of the first clamping part 4 after tightening the Connecting element 6 extend the front surface 29 and the rear surface 30 of the first clamping part 4 at the angle a to the longitudinal axis I of the Connection element 6.

FIG. 3 shows a view according to FIG. 2 in a pre-assembly state, in the first and second clamping parts 4 and 5 already have the busbar 3 reach around and loosely from the threaded bolt 7 and the threaded nut 8th be held together. Also is already between the top pad 19 of the first clamping part 4 and the threaded nut 8 already the conductor 2 in shape a flat rail and the washer 9 are arranged. In this The pre-assembly state is the first clamping part 4 on the threaded bolt 7 pushed on and rests with its front end of the clamping surface 12 of its long leg 10 on the front edge of the end face 17 of the busbar 3. The remaining clamping surface 12 and the contact surface 14 are in the Pre-assembly state not yet in contact with the end face 17 or side face 18 of the busbar 3.

Furthermore, FIG. 2 (see also FIG. 5) shows that in the first clamping part 4 a centrally emerging from the pad 19 bore 20 for the Threaded bolt 7 is arranged. This bore 20 runs with its longitudinal axis L. and thus the inner wall 15 parallel to the front surface 29 and the Rear surface 30 of the first clamping part 4 and thus at a right angle plus the angle a to the connection surface 19 of the first clamping part 4.

For fastening the conductor 2 to the first clamping part 4 and the two Clamping parts 4 and 5 on the busbar 3, the threaded nut 8 in the direction of the second clamping part 5 screwed and thereby the washer 9, the Conductor 2 and the first clamping part 4 on the end face 17 of the busbar 3 pressed. Due to the eccentric in relation to the center of the busbar 3 The introduction of force via the connecting element 6 for the clamping movement will in the pre-assembled state only in the area of the front edge of the end face 17 of the busbar 3 with its clamping surface 21 supporting first clamping part 4 about an imaginary axis, which is in the longitudinal direction and parallel to the busbar 3 and laterally spaced therefrom, pivoted until the clamping surface 12 and the contact surface 14 substantially over the entire surface on the end face 17 or Lying side surface 18 of the busbar 3. Then the one shown in Figure 2 Mounting condition reached. In this state of fortification the first has Clamping part 4 in the area of its side facing away from the busbar 3 Inner wall 15 plastically deformed because the threaded bolt 7 over the Has impressed the tightening force of the threaded nut 8 in the inner wall 15. hereby the clamp connection achieved is also self-locking. In Figure 2 is for a better understanding of the stamping of the threaded bolt 7 in the Inner wall 15 of bore 20 is the original course of inner wall 15 shown in dashed lines in the pre-assembled state. The tolerance zone is also the Hole 20 lifted on one side so d. H. the bore axis of the bore 20 is in Direction of the busbar 3 slightly (by a few 1/10 mm) so that the Threaded bolt 7 in the attached state in intimate contact with the side surface 18 of the busbar 3 is. The thread of the threaded bolt 7 can be used here be easily pressed into the side surface 18 of the busbar 3.

4 shows a view of the first upper clamping part 4 according to FIG. 3 from below, that is, seen from the busbar 3 to be clamped, shown. It is it can be seen that the essentially in the region of the short leg 13 extending bore 20 is aligned such that the approach 11th facing area of the inner wall 31 of the bore 20, the contact surface 14 in Area of the clamping surface 12 cuts and thus in the assembled state to the Recess 16 or the busbar 3 arranged therein adjoins.

With reference to Figure 5, which is a sectional view of Figure 4 along the section line A-A shows the non-rectangular or parallel alignment of the connecting surface 19, the clamping surface 12 or the contact surface 14 to the front surface 29 and the Rear surface 30 of the first clamping part 4 or to the longitudinal axis L of the bore 20 seen. The adjacent clamping surface 12 and the contact surface 14 are aligned at a right angle b to each other. The clamping surface 12 runs parallel to the connection area 19. The connection area 19 is in one Angle of 90 ° minus the angle a to the longitudinal axis L of the bore 20 aligned.

The embodiment described above shows that the electrical conductor 2 is designed as a flat rail, but this can also be a cable Cable lug for attachment to the connection terminal.

LIST OF REFERENCE NUMBERS

1

terminal

2

ladder

3

conductor rail

4

first clamping part

5

second clamping part

6

connecting element

7

threaded bolt

8th

threaded nut

9

washer

10

long leg

11

approach

12

clamping surface

13

short leg

14

contact surface

15

inner wall

16

recess

17

face

18

side surface

19

terminal area

20

drilling

21

clamping surface

22

long leg

23

contact surface

24

short leg

25

Inner surface

26

approach

27

recess

28

face

29

front surface

30

posterior surface

a

angle

b

angle

I

longitudinal axis

L

longitudinal axis

Claims (12)

Terminal for connecting an electrical conductor to a single busbar, with a first clamping part and a second clamping part, which in a fastening state are clamped to the busbar with their respective clamping surfaces via a connecting element arranged laterally next to the busbar,
characterized in that the first clamping part (4) and the connecting element (6) are designed such that, starting from a pre-assembly state in which the clamping parts (4, 5) lie loosely on the busbar (3), by actuating the connecting element (6 ) in addition to the clamping movement of at least the first clamping part (4) in the direction of the busbar (3), a pivoting movement of the first clamping part (4) in the direction of the busbar (3) is achieved. Terminal according to claim 1, characterized in that the connecting element (6) has a threaded bolt (7) which is guided through a bore (20) in the first clamping part (4). Terminal according to claim 2, characterized in that a connection surface (19) for the electrical conductor (2) is arranged on the first clamping part (4) and the connection surface (19) at an angle deviating from a right angle by an angle (a) is aligned with the longitudinal axis (L) of the bore (20) in the first clamping part (4). Terminal according to claim 3, characterized in that the electrical conductor (2) is designed as a flat rail or cable end lug and can be fastened to the connection surface (19) via a threaded nut (8) which interacts with the threaded bolt (7). Terminal according to one of claims 1 to 4, characterized in that the first and the second clamping part (4, 5) are substantially L-shaped, each with a long leg (10, 22) and a short leg (13, 24) and Clamping surfaces (12, 21) are arranged on the sides of the long legs (10, 22) facing one another in the fastening state, which are in contact with opposite sides of the busbar (3) in the fastening state. Terminal according to claim 5, characterized in that the busbar (3) is designed as a flat rail with a rectangular cross-section and corresponding end faces (17, 28) and side faces (18), in the fastening state the clamping faces (12, 21) of the first and second clamping parts ( 4, 5) are clamped to the end faces (17, 28) of the busbar (3) and adjoining contact surfaces (14, 23) are arranged at right angles to the clamping surfaces (12, 21) on the short legs (13, 24) rest in the attached state on the side surface (18) of the busbar (3). Terminal according to one of claims 3 to 6, characterized in that the clamping surface (12) of the first clamping part (4) is aligned parallel to the connection surface (19). Terminal according to one of claims 5 to 7, characterized in that the threaded bolt (7) and the second clamping part (5) are formed in one piece and the end of the threaded bolt (7) opposite the threaded nut (8) in the short leg (24) of the second clamping part (5) passes. Terminal according to one of claims 1 to 8, characterized in that in the fastening state the inner wall (15) of the bore (20) is pivoted through an angle (a) to the longitudinal axis (L) of the threaded bolt (7) and the threaded bolt (7) in the part of the inner wall (31) opposite the long leg (10) is pressed in. Terminal according to one of claims 3 to 9, characterized in that the angle (a) is in the range from 5 ° to 6 ° and is preferably 5 °. Terminal according to one of claims 6 to 10, characterized in that in the pre-assembly state, the first clamping part (4) rests on the end face (14) only in the region of its end facing away from the contact surface (14), the remaining part of the clamping surface (12) and the contact surface (14) is spaced from the end face (17) or side face (18) of the busbar (3) and the inner wall (15) of the bore (20) runs parallel to the longitudinal axis (L) of the threaded bolt (7). Terminal according to one of claims 1 to 11, characterized in that the first clamping part (4) is made as a hot-pressed part made of copper.

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