EP2301115B1 - Electrical connection device - Google Patents

Description

The present invention relates to an electrical connection device and in particular to an electrical connection terminal for connecting an electrical conductor. The electrical connection device according to the invention may in particular also be suitable for connecting a plurality of electrical conductors.

In the prior art electrical connection devices and electrical terminals have become known, which are suitable for connecting one or more conductors. In most cases, such electrical connection terminals are produced from stamped and bent components, in which first a base plate is punched out, which is then bent along the intended bending edges. In this case, the contact spring is generated from a bent portion of the base plate and bent into the clamping area for the conductor to be connected in order to clamp a conductor to be connected against the clamping region of the electrical terminal.

A disadvantage of the known state of the art is that the components produced by bending punching technology have a substantially angular basic shape which permits only a limited amount of dense packing if several connection terminals are to be arranged adjacent to one another.

A further disadvantage of the known state of the art is that it is generally not possible to provide a linear configuration of the conductor to be connected and the contact element connected, since due to the curved shape of the electrical connection terminal there is a directional offset in at least one direction.

One possible linear configuration of a connector pin discloses the EP 1 783 868 A1 , This includes a connection head and a pin extension. At the connection head is provided a spring which engages in a window in the connection head. If a conductor is inserted into the connection head, it pushes the spring out of the window and is clamped to the inner wall of the connection head. A disadvantage of such connector pins that the release of the clamped conductor is very difficult.

Also the DE 198 33 610 C1 describes a terminal for electrical conductors, which is suitable for a linear configuration. The terminal comprises a contact part and a contact pin. In a conductor insertion recess in the contact part, a conductor can be inserted into the contact part and clamped by a spring. For this purpose, the conductor is inserted through an insertion slot in the clamping bracket of the spring, which is pulled through a passage opening in the contact part to the outside and thus clamps the conductor between the clamping bracket and inner wall of the contact part. The disadvantage is a high design effort and the space required to operate the terminal can.

Against the background of the known state of the art it is therefore the object of the present invention to provide an electrical connection device and in particular an electrical connection device Terminal for connecting a conductor to provide, which allows a high packing density and with which a linear arrangement is possible.

This object is achieved by an electrical connection device having the features of claim 1, as well as by an electrical connection device having the features of claim 17. Preferred developments of the invention are the subject matter of the subclaims. Further advantages and features of the invention will become apparent from the embodiments.

The electrical connection device according to the invention for connecting a conductor comprises at least one contact sleeve made of an electrically conductive material, wherein a clearance or recess for a contact spring is provided on the contact sleeve. At the franking a contact spring is arranged, which clamps a plugged from a Einsteckseite in the contact sleeve conductor against an inner wall of the contact sleeve. In this case, the contact spring can be pivoted outward through the franking or is arranged there pivotable, so that the contact spring is pivoted to the outside during insertion of a conductor to be connected to the corresponding conductor cross-section, while a corresponding clamping force is applied to the conductor.

The electrical connection device according to the invention has many advantages. A significant advantage of the electrical connection device according to the invention is that by using a contact sleeve, a particularly small-sized electrical terminal can be provided, which may have a significantly denser packing on a base than known electrical connection devices.

Another significant advantage of the electrical connection device according to the invention is that through the contact sleeve, a linear connection of the conductor to be connected and a connected contact element is made possible. The conductor to be connected is inserted linearly from the insertion side into the contact sleeve, where it is clamped in the region of the clamping point against the inner wall of the contact sleeve and at the opposite end of the contact sleeve can be provided linearly a contact element, so that a total of axisymmetric structure may be present.

In a particularly preferred development, the contact sleeve has a rotationally symmetrical cross section at at least one point. In particular, the contact sleeve is made of a rotating part, so that the base part of the contact sleeve is formed completely rotationally symmetrical before the final machining. The use of such a contact sleeve allows a particularly compact construction of the electrical connection terminal and a space-saving arrangement of several connection areas for connecting a plurality of conductors to a connection device.

In particularly preferred embodiments, the connected contact element is aligned linearly with respect to the contact sleeve. In a linear arrangement of the contact sleeve and the contact element is required in the plane perpendicular to the connecting direction very little space, so that a particularly high packing density is possible.

Basically, the use of any electrical contact elements is possible as a contact element with which the electrical connection device can be connected to another component. For example, the use of a round, flat or flattened contact pin is preferred, which is placed on a lower slotted sleeve portion of the contact sleeve or is inserted therein. However, it is also possible to use other contact elements in order to connect the electrical connection device with, for example, a printed circuit board.

In all embodiments and developments, the contact sleeve preferably has a central receiving opening for receiving a conductor, wherein in particular the diameter of the receiving opening is adapted to the cross section of the male conductor such that only a small gap remains. This enables a particularly dense package of conductors to be connected.

Particularly preferably, the contact spring is a separate part and clamps a conductor to be connected against an inner wall of the contact sleeve. In particular, the contact spring has a fastening section and at least one spring section, with the contact spring preferably at least partially enclosing the contact sleeve with the fastening section. From the attachment portion, the spring portion extends directly or indirectly in the direction of the nip, where the spring portion clamps an inserted conductor against the inner wall of the contact sleeve.

In particularly preferred developments of the attachment portion is annular and may have a slot at one point. With the annular shaped attachment portion, the contact spring is pushed in particular on or over the end of the contact sleeve on the insertion side and there is engaged in particular in a circumferential groove of the contact sleeve, so that there is a tight fit of the contact spring in relation to the contact sleeve in the axial direction.

In a preferred embodiment, the contact sleeve in the clamping region on a transverse opening transverse to the longitudinal extension of the particular cylindrical receiving opening. With the transverse opening, a clamping edge of the contact spring for clamping a einzusteckenden conductor together.

The clamping edge is in particular straight and clamps the conductor to be connected or its conductor wires linearly the transverse opening into it. The transverse opening preferably extends in the clamping region of the conductor to be inserted transversely to the insertion direction.

Through the transverse opening, a defined depression is made available on the preferably cylindrical receiving opening, which allows to provide a straight clamping edge on the contact spring, which also defines and reliably clamps a ladder tuft of several fine conductor wires. By a straight clamping edge a conductor with a plurality of conductor wires is not fanned out, but all the conductor wires are pressed straight into the clamping sleeve.

The transverse opening thereby allows the conductor wires to be pressed in by the contact spring, so that the conductor wires can have a slight bend in the region of the transverse opening, since the conductor leads there are moved from the clamping edge of the contact spring into the transverse bore, transverse groove or e.g. Notch trained transverse opening can be pressed into it.

At the transverse opening often forms a small burr, which has the additional positive property that the coefficient of friction for large and small wires is increased.

Preferably, the contact spring is at least partially made of a material with good or even very good spring properties. In particular, the use of a non-conductive material is possible. This allows the use of cheaper materials and overall more cost-effective production of the electrical connection device. The contact spring may e.g. made of spring steel and in particular a non-rusting spring steel, bronze or spring bronze or the like.

In particular, the insertion end of the opposite end of the contact sleeve is designed slotted to facilitate attachment to a contact pin.

In all embodiments and further developments of the electrical connection device according to the invention described above, a release device for canceling the clamping of the contact spring is preferably provided to facilitate the removal of a connected conductor in case of need. In all embodiments, it is preferred if the contact spring in the clamped state has an acute angle to the insertion direction of a conductor to be connected. In these cases, the clamping force is exacerbated by pulling on the conductor, as there is a directional lock. In order to remove the conductor in case of need, the release device can be used, which can be actuated with an actuating device and thus cancels the clamping of the conductor on the inner wall of the contact sleeve.

In preferred developments, the release device bears against the contact sleeve and is surrounded by the contact sleeve and the contact spring. At least the attachment portion of the contact spring surrounds the release device.

At the release device, a conical insertion ring may be provided to facilitate insertion of a conductor into the contact sleeve.

Furthermore, at least one Verrastungselement can be provided on the release device, which there causes a latching with the contact sleeve or with the contact spring after insertion of the release device, so that the release device, in particular for solving the clamping axially displaceable by a certain way, but no longer easily removable from the contact sleeve.

Preferably, the contact sleeve is machined in an area on the insertion side such that a half-cylinder is available there. Another adjoining half-cylinder or the like is provided by a part of the release device, so that there is a central cylindrical insertion opening for a conductor to be connected. The on the insertion semi-cylindrical shaped contact sleeve and there semi-cylindrical shaped release device result in a total of a ring which is surrounded by the attachment portion of the contact spring.

By an axial movement of the release device, the release device moves along there, for example, semi-cylindrical shaped contact sleeve until a part of the release device abuts against the spring portion of the contact spring and pivots the contact spring in the further movement to the outside and thus cancels the clamping force.

In a further preferred embodiment, a plurality of cylindrical contact sleeves for receiving a respective conductor are arranged adjacent. Particularly preferred is an arrangement according to a "5" of a cube, in which four cylindrical contact sleeves at the corners of a rectangle and a contact sleeve is arranged centrally in the center of the rectangle. In this case, a diagonal diameter through three contact sleeves is smaller than four times the smallest diameter of a single contact sleeve.

These dimensions result inter alia from the fact that when using a rectangular contact sleeve, the diagonal diameter of a single contact sleeve is approximately equal to 1.4 times the minimum diameter. Now, if three such square contact sleeves are arranged diagonally, the diagonal is minimally about 4.2 times the minimum diameter of a single contact sleeve.

Through the use of cylindrical contact sleeves, the minimum diameter of a contact sleeve corresponds directly to the maximum diameter of a contact sleeve, so that it is possible to arrange three contact sleeves diagonally, wherein the overall dimension is smaller than 4 times the diameter of a single contact sleeve. With these dimensions is a certain distance the individual contact sleeves from each other possible and preferred.

In all embodiments may be provided on one side of the contact sleeve an actuating surface of the release device, which is suitable for example for receiving a screwdriver to actuate the release device. A provision of the release device in the starting position is regularly achieved by the contact spring, which pushes back the release device in the basic position after removal of the screwdriver.

In all embodiments, it is preferred that the contact sleeve made of brass or copper or the like. The use of other metals is possible. The contact spring may be made of metal, but may also be made of a plastic. The release device is preferably made of plastic.

In another preferred electrical connection device, a clamping groove is formed on the contact sleeve on the contact sleeve transversely to the insertion direction of the conductor, in which the contact spring presses the conductor at least partially.

This inventive electrical connection device has considerable advantages. Preferably, the clamping groove is provided at a transverse opening which extends transversely to the insertion direction, in particular in the clamping region of the conductor to be inserted. Through the transverse opening, a defined clamping groove is formed on the preferably cylindrical receiving opening, where the cylindrical receiving opening has a defined depression. As a result, a straight clamping edge can be used on the contact spring, which it allows a ladder tufts of several fine conductor wires defined and clamped reliably at the clamping groove. A leader with a plurality of conductor wires is not fanned, but pressed straight into the clamping groove in the clamping region of the cylindrical receiving opening.

Preferably, the clamping groove is formed by a transverse bore or a transverse groove and cooperates with the clamping edge at the top of the contact spring. The clamping edge at the tip of the spring portion of the contact spring is preferably straight. The clamping edge is biased by the contact spring in the engaged position.

Further advantages and features of the present invention will become apparent from the embodiments, which are explained below with reference to the accompanying figures.

Figur 1

eine perspektivische Gesamtansicht einer erfindungsgemäßen elektrischen Anschlussklemme;

Figur 2

die elektrische Anschlussklemme aus Fig. 1 ohne Gehäuse;

Figur 3

eine geschnittene perspektivische Seitenansicht der Anschlussklemme nach Fig. 1;

Figur 4

eine geschnittene Seitenansicht mit angesetztem Werkzeug zum Lösen der Klemmung;

Figur 5

eine einzelne Kontakthülse mit Kontaktfeder und Löseeinrichtung;

Figur 6

eine Explosionsdarstellung der Kontakthülse mit einer Kontaktfeder und einer Löseeinrichtung;

Figur 7

eine weitere Ausführungsform einer Kontakthülse mit einer Kontaktfeder und einer Löseeinrichtung;

Figur 8

noch eine weitere Ausführungsform einer Kontakthülse mit einer Kontaktfeder und einer Löseeinrichtung;

Figur 9

die Kontakthülse und die Kontaktfeder der Ausführungsform nach Fig. 8; und

Figur 10

die Kontakthülse der Ausführungsform nach Fig. 8.

In the figures show:

FIG. 1

an overall perspective view of an electrical terminal according to the invention;

FIG. 2

the electrical connection terminal off Fig. 1 without housing;

FIG. 3

a sectional perspective side view of the terminal after Fig. 1 ;

FIG. 4

a sectional side view with attached tool for releasing the clamping;

FIG. 5

a single contact sleeve with contact spring and release device;

FIG. 6

an exploded view of the contact sleeve with a contact spring and a release device;

FIG. 7

a further embodiment of a contact sleeve with a contact spring and a release device;

FIG. 8

Yet another embodiment of a contact sleeve with a contact spring and a release device;

FIG. 9

the contact sleeve and the contact spring of the embodiment according to Fig. 8 ; and

FIG. 10

the contact sleeve of the embodiment according to Fig. 8 ,

With reference to the FIGS. 1 to 6 In the following, a first embodiment of the present invention will be described, wherein FIG. 1 an overall perspective view of an electrical terminal 1 and an electrical connection device is shown.

In the Fig. 1 illustrated electrical terminal 1 comprises a housing 25, on the top five receiving openings 11 are arranged. Four openings for insertion and connection of electrical conductors 2 (see. Fig. 3 ) are arranged on a rectangular or square base, while the fifth opening is provided in the center of the square. As a result, three insertion openings 11 are arranged on a diagonal, wherein a diagonal diameter 27 via the three insertion openings 11 is only slightly larger than three times the diameter of a diagonal 28 of a single insertion opening 11. This is made possible by the fact that the insertion and arranged below Contact sleeves 3 are circular or cylindrical.

In Fig. 2 is the electrical terminal off Fig. 1 shown without surrounding housing 25, so that the individual contact sleeves 3 can be seen. Overall, in the plane of the upper edge of the housing 25, there is a tight packing of the conductors to be connected, which could be increased by the special configuration of the individual contact sleeves 3.

A contact sleeve 3 with a contact spring 5 mounted thereon and a release device 19 is in Fig. 5 shown individually. In Fig. 6 is an exploded perspective view of the contact sleeve 3 of the contact spring 5 and the release device 19 is shown.

Fig. 6 clearly shows that the initially formed as a cylindrical rotary member contact sleeve 3 in a region on the Einsteckseite 6 has a recess or franking 4, in which case a semi-cylindrical part of the contact sleeve was removed as franking 4, so that the contact sleeve 3 on the Einsteckseite 6 only as semi-cylindrical part is formed.

In the vicinity of the end on the insertion side 6, a groove 18 is provided on the outer circumference of the contact sleeve 3, in the assembled state, a fastening portion 16 of the formed as a separate spring member 12 contact spring 5 engages.

A spring portion 17 of the contact spring 5 serves, in the region of the franking an inserted conductor 2 against the inner wall 8 (see 3 and 4 ) to clamp. The attachment portion 16 of the compact spring 5 may be formed as a continuous ring or as in Fig. 6 shown slotted on the opposite side of the spring portion 17 to facilitate attachment to the contact sleeve 3.

Before the assembly of the contact spring 5 or optionally thereafter, the release device 19 is mounted. In the assembled state, the release device 19 extends between the contact spring 5 and the contact sleeve 3. In this case, the longitudinal webs of the release device 19 abut against the semi-cylindrical contact sleeve 3 formed in the region of the clearance 4. The release device 19 is displaceable in the longitudinal direction of the contact sleeve 3 relative to the contact sleeve 3. Prevent the latching elements 21 on both sides of the release device 19 an unintentional falling out of the release device 19 from the terminal. 1

At the opposite end of the Ansteckseite 6 or the connection side 7, a board or the like via a contact pin 14 can be contacted. A significant advantage of the terminal 1 according to the invention is that a linear wiring of be joined conductor 2 to the contact pin 14 or another contact element is possible. Overall, thus a both in the mounting surface and overall small-sized terminal 1 is possible.

At the release device 19, an insertion ring 20 may be provided, which is designed in particular conical in order to facilitate the insertion of an electrical conductor 2. The conductor enters through the free diameter 13 on the contact sleeve 3 in the contact sleeve and pivots the spring portion 17 of the contact spring during insertion slightly outward. An insertion ring or insertion funnel may alternatively be formed by the housing.

One significant advantage of the present terminal 1 is that not only the connection of conductors with multiple conductor wires is possible, but also the connection of solid conductors. Solid conductors can be inserted directly without pressing the button or the release device 19.

At the release device 19, an actuating groove 26 may be provided, which is to plant a tool 22 (see. Fig. 4 ) is adapted to displace by pressure against the actuating groove 26, the release device 19 axially along the longitudinal direction of the contact sleeve 3. In this case, the release device 19 meets the spring portion 17 of the contact spring 5 and presses the spring portion 17 of the contact spring to the outside, so that a recorded on the contact sleeve 3 conductor 2 can be removed again.

As in Fig. 2 shown, a linear connection of a conductor along an axis 15 from the insertion side 6 to the opposite connection side 7 is possible here.

The closely adjacent terminals of the terminal are in each case arranged in pairs with the actuating grooves 26 to the outside, so that the overall result is a tight package.

In Fig. 3 It is shown how a conductor 2 is inserted into the terminal 1 according to the invention and thereby opens the contact spring 5, so that the conductor 2 against the inner wall 8 of the contact sleeve 3 can be clamped.

The contact spring 5 or its spring portion 17 enters from the outside into the clearance 4 of the contact sleeve 3.

As in Fig. 4 is shown, by actuation with a tool 22 which is inserted into the Betätigungsungsnut 26 of the release device 19, the release device 19 axially displaced in the direction of the longitudinal extent of the contact sleeve 3. In this case, the release device 19 strikes the spring portion 17 of the contact spring 5 and pivots the spring portion 17 with further penetrating tool 22 to the outside, so that the clamping is released.

Overall, there is an electrical terminal 1, which is flexible and requires little space. The contact spring 5 is formed as a separate spring member 12 and thus can also consist of another material with good spring properties, but which does not have to have good electrical conductivity properties.

As a result, the manufacturing costs can be reduced and the reliability can be increased. The terminal according to the invention can be used both in conductors with multiple conductor wires as well as for connecting solid conductors, resulting in a flexible field of application.

With reference to the FIG. 7 Now another embodiment and then with reference to the FIGS. 8 to 10 yet an embodiment of electrical terminals 1 according to the invention explained. The same or similar parts are provided with the same reference numerals.

In Fig. 7 an electrical terminal 1 is shown. In the clamping region 33 of the contact sleeve 3 is in the embodiment after Fig. 7 designed as a transverse bore 30 transverse opening 32, so that there in the cylindrical receiving opening 11, a transverse groove 31 is formed, which serves as a clamping groove 34.

The transverse opening 32 in the clamping region 33 of the contact sleeve 3 is aligned transversely to the longitudinal extent of the cylindrical receiving opening 11. With the clamping groove 34 a clamping edge 29 of the contact spring 5 acts to clamp a einzusteckenden conductor 2 together.

In the upper area of the Fig. 7 is a schematic side view of a contact spring 5 shown right next to the electrical terminal 1. In the schematic side view is clearly seen that the lower end of the spring portion 17 of the contact spring 5 is straight, so that is pressed with the straight clamping edge of the clamped conductor 2 linearly in the clamping groove 34 of the receiving opening 11.

Dashed lines are shown in Fig. 7 the non-visible edges of the receiving opening 11. It can be clearly seen that the clamping groove 34 springs back radially.

The clamping edge 29 is here straight in the embodiment, while it was provided rounded in the previous embodiments, to adapt to the cylindrical receiving opening 11. The just formed clamping edge 29 clamps the conductor to be connected. 2 or its conductor cores linear here in the transverse opening 32 into it.

Through the transverse bore 30, a defined depression or clamping groove 34 is provided on the cylindrical receiving opening 11, into which a straight clamping edge 29 of the contact spring 5 can dip. Therefore, a ladder tufts of several fine conductor wires is defined and reliably clamped. A fanning due to a front rounded clamping edge does not take place.

In this case, the transverse bore 30 allows the conductor wires to be pressed in by the contact spring 5, so that the conductor wires can have a slight bend in the region of the transverse opening 32, since the conductor leads there are moved from the clamping edge 29 of the contact spring 5 into the transverse bore 30, transverse groove 31 or e.g. Notch trained transverse opening 32 are pressed into it.

At the transverse opening 32, a small burr is often formed in the production, which has the additional positive property that the coefficient of friction for large and small einzusteckende conductor 2 is increased.

In the in the FIGS. 8 to 10 illustrated embodiment of an electrical terminal 1 according to the invention, the transverse opening 30 is formed as a transverse groove 31. The transverse groove 31 serves as a clamping groove 34, in which a conductor 2 to be connected or its conductor wires are pressed by the contact spring 5.

Again, the clamping edge 29 is straight, as they can dip at the lateral edges in the clamping groove 34.

While in the contact sleeve 3 in the embodiment according to Fig. 7 a transverse bore is provided, a transverse groove 31 is provided here to provide a clamping groove 34, in which a clamping edge just formed 29 is immersed.

The transverse groove 31 extends in the clamping region 33 of the male conductor 2 transversely to the insertion direction. Due to the transverse groove 31, a defined clamping groove 34 is provided on the cylindrical receiving opening 11, on which the cylindrical receiving opening 11 has a defined depression. As a result, a straight formed clamping edge 29 can be used on the contact spring 5, which also allows a ladder tufts of several fine conductor wires defined and reliably clamped to the clamping groove 34. A conductor with a plurality of conductor wires is not fanned out, but pressed straight into the clamping groove 34 in the clamping region 33 of the cylindrical receiving opening 11.

As in all embodiments, a release device 19 may be provided.

LIST OF REFERENCE NUMBERS

1

terminal

2

ladder

3

contact sleeve

4

franking

5

contact spring

6

insertion side

7

End, connection side

8th

inner wall

9

Job

10

turned part

11

receiving opening

12

spring part

13

diameter

14

pin

15

axis

16

attachment section

17

spring section

18

groove

19

release device

20

inlet ring

21

latching

22

Tool

25

casing

26

operating groove

27

Diagonal diameter

28

diameter

29

clamping edge

30

cross hole

31

transverse groove

32

transverse opening

33

clamping range

34

clamping groove

Claims (15)

1. Electric connection device (1) for connecting a conductor (2) having at least one contact bush (3) of a conductive material with a clearing (4) for a contact spring (5) and a contact spring (5) disposed thereat which clamps a conductor (2) plugged into the contact bush (3) from a plug-in side (6) against an inner wall (8) of the contact bush (3), characterized in that the contact spring (5) is pivotable outwardly through the clearing (4), such that, as a conductor (2) to be connected is plugged in, the contact spring (5) pivots outwardly as far as the corresponding conductor cross-section while at the same time a corresponding clamping force is applied to the conductor.
2. The electric connection device (1) according to claim 1 wherein the contact bush (3) is rotationally symmetric in cross-section at least in one place (9) and is in particular manufactured from a turned component (10).
3. The electric connection device (1) according to any of the preceding claims wherein a linear arrangement of conductor (2) to be connected and connected contact element (14) is present.
4. The electric connection device (1) according to any of the preceding claims wherein the contact bush (3) comprises a central receiving opening (11) for receiving a conductor (2) wherein the diameter (13) of the receiving opening (11) is matched to a cross-section of the conductor (2) to be received.
5. The electric connection device (1) according to any of the preceding claims wherein the contact spring (5) is a separate component (12) surrounding the contact bush (3) at least in part by means of an attachment portion (16) and comprising a spring portion (17) for clamping the conductor (2) to be connected against the inner wall (8) of the contact bush (3) and/or wherein the contact spring (5) consists of a non-conductive material at least in part.
6. The electric connection device (1) according to any of the preceding claims wherein the contact bush (3) comprises a transverse opening (32) transverse to the longitudinal extension of the receiving opening (11) in the clamping zone (33) and wherein a straight clamping edge (29) is disposed at the contact spring (3) for clamping a conductor (2) to be plugged in.
7. The electric connection device (1) according to any of the preceding claims wherein the contact bush (3) is configured slotted at one end (7) opposite the plug-in side (6) to facilitate placement onto a contact pin (14).
8. The electric connection device (1) according to any of the preceding claims wherein the attachment portion (16) of the contact spring (5) is received in a groove (18) of the contact bush (3).
9. The electric connection device (1) according to any of the preceding claims wherein a releasing device (19) for releasing the clamp of the contact spring (5) is provided.
10. The electric connection device (1) according to any of the preceding claims wherein the releasing device (19) abuts the contact bush (3) and is surrounded by the contact bush (3) and the contact spring (5).
11. The electric connection device (1) according to any of the preceding claims wherein a conical insertion ring (20) is provided at the releasing device and/or wherein at least one engagement element (21) is provided at the releasing device (19).
12. The electric connection device (1) according to any of the preceding claims wherein the releasing device (19) is semicircular in cross-section to bear against the contact bush (3).
13. The electric connection device (1) according to any of the preceding claims wherein multiple cylindrical contact bushes (3) are disposed adjacent to receive one conductor (2) each and/or wherein four cylindrical contact bushes (3) are disposed at the corners of a rectangle and one contact bush (3), centrally in the rectangle, wherein a diagonal diameter (27) through three contact bushes is smaller than four times the smallest diameter (28) of one single contact bush (3).
14. The electric connection device (1) according to any of the preceding claims wherein a clamping groove (34) is configured at the contact bush (3) transverse to the plug-in direction of the conductor (2) into which groove the contact spring (5) pushes at least part of the conductor (2) to be plugged in.
15. The electric connection device (1) according to at least one of the preceding claims wherein the contact spring comprises a straight clamping edge (29) and/or wherein the clamping groove (34) is configured at a transverse opening (32) and in particular at a transverse bore (30) or transverse groove (31).

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