DE202005005369U1 - Connecting device for direct plug connection of conductor ends and electrical device with such a connection device - Google Patents

Abstract

Connecting device (1) for connecting a stripped conductor end (2), with
a) at least one leaf spring acting as a compression spring on the conductor end (4, 53) for clamping the conductor end (2) to a busbar (3),
b) wherein the leaf spring (4, 53) is designed and arranged on the busbar (4, 53) such that the conductor end (2) can be inserted without tools directly into the clamping point (5) without tools,
characterized in that
c) the busbar a gutter-like, U-shaped trough (9) with a base leg (39) and two longitudinal limbs (12, 13) is formed, and
d) wherein the arrangement and design of the leaf spring (4, 53) is such that a conductor from a direction perpendicular to the base leg (39) of the trough (9) into the trough (9) is insertable.

Description

The The invention relates to a connection device according to the preamble of claim 1 and an electrical device with a Such connection device.

There are already long terminals for single or stranded electrical conductors in direct plug technology known in which engages in a bus bar with a recess and a collar, a leaf spring, which on the one hand easy to install, on the other hand brings the problem that relatively large forces must be transferred directly to elements of an insulating material as an abutment when inserting and contacting conductors of the leaf spring. Such a state of the art show the DE 28 25 291 C1 and the EP 1 391 965 A1 ,

Compared to the Prior art, as he from the aforementioned writings is known, should be possible easy to produce and reliable connecting device be created in direct plug technology. The busbar should also enable a particularly secure power line and high currents.

The Invention solves this object by the subject of claim 1.

After that the busbar forms a channel-like, U-shaped trough with a base leg and two longitudinal legs and the arrangement and design of the leaf spring is such, that a conductor from a direction perpendicular to the base of the Troughs can be inserted into the trough is.

These Clamp offers high reliability at minimum cost and easy to switch on and off.

Of the Application of this connection device is virtually unlimited, because it is suitable for electrical equipment of all kinds such as terminal blocks or contactors.

One very special advantage over Solutions, where a conductor is parallel to the axially free ends of the trough introduced to the base leg is, is that with the invention easily connecting devices can be realized with several terminal points. This happens because of that on a single trough-like busbar in the longitudinal direction of the Busbar to each other offset a plurality of leaf springs in the same direction and / or gegensinniger arrangement are placed in the trough, so that on a single busbar a plurality of terminal points are formed.

Especially Preferably, both the leaf spring and the busbar are easy designed as punched and bent parts from sheet metal blanks and inexpensive to produce.

The Connecting device is also from one side without a tool wired with a conductor end, whereas the leader against the Spring action can not be removed from the clamp without a tool is. Furthermore, the trough-type busbar can also reliably handle larger currents pass through, since at each point a sufficiently large conductor cross section at least a wall of the trough, which is a particular advantage represents. The U-shaped Stromscheine needs indeed unlike other constructions, two side walls, but these are relative slim interpretable, since the construction of this busbar particularly is stable. Despite the two side walls, it is therefore surprising possible, connections and in particular terminal blocks with such terminals too realize that build relatively narrow relative to the conductor width but also for transmission larger currents or Achievements are suitable without leaving individual critical posts to overheat as in the currently known state of the art.

To a first preferred variant with small width and minimum Manufacturing costs, the leaf spring a U- or V-shape with two longitudinal legs on that over a bend are connected to each other, wherein the leaf spring in such a way arranged in the trough and aligned, that the free ends of the engage both spring legs in the trough and the bend or- Tip at the side facing away from the base of the trough open side protrude upwards from the trough.

In order to takes the busbar, which the leaf spring preferably like a cage Includes essential forces of loading and unloading on.

alternative the leaf spring can be in a closed loop form with two Have longitudinal limbs. Thereafter, the spring itself essentially takes on the while plugging acting forces on.

variants these two embodiments will be specify below and in the subclaims.

Preferably is the leaf spring in a simple manner only at its first spring leg in the busbar - in particular on the side walls of the trough - kept and the busbar is considered to be made of good electrically conductive metal sheet formed punched and bent part formed.

The connection of the leaf spring (s) can be realize in a simple manner that freed from the base leg of the trough with its two longitudinal legs a cloth and aligned from the base of the trough either parallel to the base leg or bent vertically upwards or z-shaped, so that in the base leg of the trough a first window-like recess is formed, wherein the first spring leg is supported directly or on / in a recess on the cloth.

Complementary it for supporting the leaf spring appropriate when at the free ends of the longitudinal legs of the trough in each case in the region in which the first spring leg from the trough protrudes upwards, at punching tabs from the busbar are bent inwardly towards the leaf spring, in the corresponding Recesses in the first spring leg engage and this in addition to the Support busbar and hold.

to Forming a nip extends the second spring leg with its free end, which is angled to the base of the trough is formed, oblique into the trough, where the free end of the second spring leg on a busbar piece is applied, in one piece connected to the trough.

At the free axial ends of the busbar, it makes sense if the busbar piece of one of the two longitudinal legs of the U-shaped Trough is bent inward towards the interior of the trough.

Between the free axial ends of the bus bar, on the other hand, if the busbar piece freed from the base of the trough on several sides and off the base leg of the trough is bent upwards.

Appropriately points the base leg of the trough below the nip between the leaf spring and the busbar piece such or by another Free-punching another recess on which to record or Implementation of the Ladder end serves.

The Invention also makes an electrical device feasible, in particular a terminal block, a circuit board, a contactor or the like., Which with a or more connecting devices according to the invention is provided.

Further advantageous embodiments are the remaining dependent claims remove.

following The invention will be described with reference to the drawing based on embodiments described in more detail. It shows:

1 a perspective view of a first connection device in the non-connected state;

2 a sectional view of the connection device 1 in the unconnected state;

3 a sectional view of the connection device 1 in the connected state;

4 a perspective view of a leaf spring for the connection device 1 ;

5 a perspective view of a power rail for the connection device 1 ;

6 a perspective view of a connecting device with a plurality of clamping points and leaf springs on a common busbar;

7 another perspective view of the connection device 6 with only partially shown busbar;

8th a perspective view of a portion of a terminal housing with a connection device of the type 1 in the unconnected state;

9 the terminal box with the connection device of 8th in the connected state;

10 another connection device in a design as a PCB terminal; and

11 another connection device in conjunction with a ground connection for a mounting rail;

12 a perspective view of another terminal device in the non-connected state, which illustrates a first alternative way of fixing the leaf spring to the trough.

13 a sectional view of the connection device 12 in the unconnected state;

14 a perspective view of another connecting device in the non-connected state, which illustrates a further alternative way of fixing the leaf spring to the trough;

15 a sectional view of the connection device 14 in the unconnected state;

16 a perspective view of a trough-shaped busbar with a lock; and

17 a perspective view of another connecting device in the non-connected state, which has a loop-shaped leaf spring

18 - 20 different views of another connecting device according to the invention.

1 shows a first embodiment of a connection device 1 , the connection of a stripped conductor end 2 of a conductor in the so-called tool-free direct plug-in method ( 3 ).

The connection device has a busbar 3 on which to a trough 9 is formed, in which one as a compression spring on the conductor end 2 acting V-shaped leaf spring 4 for clamping the conductor end 2 at the power rail 3 is arranged, which is designed such that the conductor end 2 directly into the nip 5 between the leaf spring 4 and the busbar is also inserted without tools.

The V-shaped leaf spring 4 (please refer 2 ), which is bent from a strip-like sheet metal blank, has a first spring leg 6 on, perpendicular to the base leg of the U-shaped trough 9 is aligned and one here too angularly aligned and with the first spring leg 6 via a bend connected second spring legs 7 , the contact leg, preferably at an angle of 30 to 60 °, here approximately at an angle of 45 ° to the first spring leg 7 is aligned.

Thus, the free ends of the two spring legs 6 . 7 to the base of the bottom of the trough 9 directed and the two spring legs 6 . 7 connecting bend 27 or- tip stands out of the trough 9 upwards.

The leaf spring 4 is on her first spring leg 6 in the power rail 3 held, which is formed as a stamped and bent part of good current-conducting metal sheet.

For the production of the busbar 3 becomes an approximately rectangular metal sheet 8th first bent into a U- or gutter, so that the trough 9 with its two longitudinal legs 12 . 13 and a base leg perpendicular thereto 39 formed. Then it is out of the base leg 39 of the trough 9 a U-shaped rag 10 freed on three sides and bent from the bottom of the trough by about 90 °, so that in the base leg 39 the trough a window-like recess 11 formed.

On the rag 10 then becomes the free end of the first spring leg 6 at least supported and possibly additionally attached (eg by stapling and / or embossing), so that the first spring leg 6 perpendicular to the base leg 39 the trough protrudes upwards out of the trough.

The width of the trough 9 Corresponds essentially with the width of the leaf spring 4 so this in the trough 9 fills the free U-shaped cross section and from a longitudinal leg 12 to the other longitudinal leg 13 extends. It is also conceivable that it is slightly wider than the trough and - the trough 9 slightly widening when inserting - clamped in the same sitting.

The first spring leg 6 relies on one side of the second spring leg 7 opposite side on the cloth 10 from. The width of the trough 9 essentially corresponds to the width of the spring legs. The other spring leg 7 is on the power rail 18 supported so that the spring in the trough 9 is held securely.

From the two longitudinal legs 12 . 13 of the trough 9 are at the free ends of the longitudinal legs 12 . 13 in each case in the region in which the first spring leg 6 protruding from the trough, at punching lobes 14 . 15 bent inwards from the busbar, which cut into corresponding recesses (eg rounded cutouts) 16 . 17 in the first spring leg 6 intervention. As a result, the first spring leg 6 stabilized and supported and held in the trough.

The second spring leg 7 extends with its free end, which is angled to the base leg 39 the trough is formed obliquely in the direction of the bottom of the trough 9 , He is lying on a busbar piece 18 as an approach of one of the longitudinal legs 12 is formed by one of the two longitudinal legs of the U-shaped trough 9 from bent in the direction of the trough inside right-angled inwards.

Such is between the free end of the second spring leg 7 and the busbar approach 18 the nip 5 formed, in which from the open side of the trough ago the conductor end 2 tool-free in direct plug-in technology can be inserted. Because the busbar 3 in the base leg 39 below the nip 5 with another recess 19 ( 3 ), which is formed by that another busbar piece 22 from the base leg 39 the conductor rail is freed on three sides and bent in the area of the plane below the one longitudinal leg, the conductor end 2 over the base leg 39 of the trough 9 Be inserted into the terminal point, where it s.der two contact humps 20 . 21 (please refer 3 ) at the Busbar approach 18 will be contacted. Above the one bump has the busbar piece 18 a head start.

Such a simple manner tool-free contactable terminal device in direct plug technology is realized with the simplest means, which is characterized by a simple structure and yet is very reliable, in particular, since the trough-like busbar 3 essentially all forces at the terminal point 5 absorbs and due to their geometry also has a sufficient large current conductivity.

The free end of the contact leg 7 the leaf spring 4 is formed and arranged (flattening 28 ; 4 ) that a conductor in the switched position pressed well to the busbar and self-locking is secured against pulling out of the terminal point.

On the basis of the connection device 1 can be connected to a single trough-shaped busbar 3 in accordance with longer design of the busbar 3 also realize several connections. For this purpose, in the extended, further trogartig shaped busbar 9 At several axially offset positions leaf springs 4 arranged.

Thus, on the one hand it is possible, in each case one of the connecting devices at both free ends of the trough-like busbar 1 by type 1 form, in which case the contact legs 7 the two leaf springs 4 oriented in opposite directions. Such an arrangement shows 11 ,

In addition, between the two end leaf springs 4 even more leaf springs 4 be arranged, with the other leaf springs 4 with her first spring legs 6 each according to the type of l are attached to the busbar and wherein the busbar pieces 18 at the clamping points in each case on three sides in the base leg 39 of the trough 9 cleared and from the bottom of the trough 9 are bent substantially vertically upwards.

In this way, any number of connections can be made to a connection device 1 be realized either in the same direction and / or in opposite directions.

Optional punched out 23 in the busbar are for a straightener 24 a cross connector device or the test tap usable ( 6 and 7 ).

The busbars 3 can be easily arranged on electrical devices of various kinds, especially in terminal blocks with insulating housings 25 (please refer 8th and 9 ) or shooters (not shown here) or the like. Or on printed circuit boards 26 (please refer 10 ).

In the insulating housings 25 can be webs 29a , b between the busbar legs grab, for example, a stop limit for the leaf spring and the screwdriver when loosening (bridge 29b ) or a spring abutment (bridge 29a , the thigh 6 in a slot between himself and another bridge 29c the insulating material fixed) form.

In the Isolierstoffgehäusen is a first opening 30 formed above the nip to a conductor ( 8th , 9 ) can be inserted without tools in the terminal point and a second opening 31 at the side of the clamping point above the contact leg, around the conductor end 2 release at the nip by the contact leg 7 the leaf spring 4 eg with a screwdriver 32 through the second opening 31 is depressed, leaving the conductor from the insulating material 25 is drawable.

10 shows a variant in which the busbar 3 by way of example here two in one piece with the busbar 3 trained soldering legs 33 is provided in holes 34 the circuit board 26 can be used, so that the connection device can also be used on printed circuit boards. An over-housing 35 with openings 36 . 37 for switching on and off can be on the circuit board 26 via the connection device.

11 shows a variant, wherein the busbar of a further connecting device 1 with two clamping points and leaf springs 4 is provided and where the busbar 3 another busbar 38 is formed or attached, which can be used directly or via contact springs or the like. For contacting a support rail. In this way, for example, a PE connection can be realized with simple means.

12 and 13 show a first variant 1 in which the first spring leg 6 in his in the trough 9 engaging end portion of a window-like recess 41 has, in which a Z-shaped angled flap 42 which extends from the base leg 39 of the trough is cleared and bent out. Thus, this spring is supported on the one hand on the cloth 42 and on the other hand with the second spring leg on the busbar extension 18 from.

The rags 14 . 15 , which are bent inwards from the bus bar and simply serve as an abutment for the busbar or in corresponding recesses 16 . 17 in the first spring leg 6 intervene, in turn, can be provided in addition. It is also conceivable that in this Va eliminated, since the z-shaped flap already provides a safeguard against pulling out the spring. The further support takes place at the busbar approach 18 , As a result, the first spring leg 6 once again kept very stable in the trough.

14 shows another variant too 1 where the first spring leg 6 again a recess 44 which lies at the level of the bottom of the trough, so that the first spring leg slightly above the base leg 39 of the trough 9 protrudes downwards or outwards. In the recess in turn extends a cloth 43 - or here a piece of the base leg 39 of the trough 9 - inside. This is not bent here but on three sides in the base leg 39 of the trough 9 cut free, leaving the first spring leg 6 with its recess 44 in the plane of the base leg 39 of the trough 9 on this rag 43 is deferred. Thus, this spring is supported on the one hand on the cloth 43 and on the other hand again on the busbar. The rags 14 . 15 , which are bent inward from the busbar can in turn be provided in addition or - as shown here - omitted. In any case, the leaf spring 4 once again kept very stable in the trough.

16 illustrates how the busbar approach 18 from one of the longitudinal legs 12 is bent and extends to the other longitudinal leg, where an approach 45 and a corresponding recess 46 the busbar or the corresponding longitudinal leg lock-like mesh and thus form a stable cage or frame on which the leaf spring can be securely supported.

17 shows a perspective view of another connecting device in the non-connected state, the a loop-shaped leaf spring 53 having. On the trough 9 - here on the open side - is the leaf spring 53 for clamping the conductor end to the busbar extension 18 arranged, which is designed such that the conductor end without operating tool directly into the nip 55 between leaf spring 4 and busbar approach 18 can be inserted without tools.

The leaf spring 53 has a first spring leg 56 on, which with a window-like recess 57 is provided. At the first spring leg 56 with the window-like recess 57 is the clamping spring on the trough 9 arranged as a busbar. Here it is on the open side of the trough 9 on the edges of the longitudinal legs 12 . 13 hung up, taking it from the lead 40 of the busbar section 18 interspersed, which is so bent that he the loop-shaped leaf spring 53 against removal from the trough in the region of the nip 55 guaranteed.

Such is the leaf spring with the spring leg 56 aligned parallel to the busbar and placed flat on the trough and / or attached to this. Then, the leaf spring describes a closed loop 58 , being in the loop 58 outside the trough to the window-like recess 57 extends back and this with a free clamping leg 59 - Which here only has the width of the recess - interspersed. The free clamping leg 59 presses the conductor end against the busbar extension 18 ,

The loop 58 has an elongated shape and is substantially inclined to the conductor insertion direction, in particular such that the angle α between the clamping leg and the conductor insertion L - here vertically from above - less than 45 °, in particular less than 30 °.

This leaf and clamp spring 53 thus surprisingly has a geometry which is reminiscent of the geometry of so-called tension spring connections. But it is arranged and designed such that a conductor from the opposite side of the loop 58 can be inserted into the nip without tools. A very special advantage of this clamping spring 53 Again, this is because it allows a direct plug-in connection on the one hand, because a conductor can easily be introduced into it but not readily against the edge in the region of the nip again 55 be pulled out. For this purpose, the user rather needs a tool. In addition, on the other hand, it also offers the advantage of a self-contained system, ie, the clamping spring 53 itself takes all forces between the conductor end and clamping spring 53 on. It is only necessary that the spring leg 56 with the recess 57 at the power rail or the trough 9 is fixed.

Another particularly advantageous embodiment of the invention show the 18 to 20 ,

The connection device illustrated in these figures also has a busbar 3 on which to the trough 9 is shaped in which the V-shaped leaf spring 4 is arranged.

The V-shaped leaf spring 4 is also bent from a strip-like sheet metal blank and has the first spring leg 6 on, perpendicular to the base leg of the U-shaped trough 9 is aligned and this angularly aligned and with the first spring leg 6 via a bend connected second spring legs 7 , the contact leg. Again, these are the free ends the two spring legs 6 . 7 to the base of the bottom of the trough 9 directed and the two spring legs 6 . 7 connecting bend 27 or- tip stands out of the trough 9 upwards.

As in 1 is the leaf spring 4 also on her first spring leg 6 in the power rail 3 held. In the base leg 39 the trough is in turn a window-like recess - here by the reference numeral 11 provided - trained. The recess 19 allows the conductor to pass through the ground 39 of the trough 9 , Between the recesses 11 . 19 is a wall 68 in the bottom of the trough 9 educated.

The width of the leaf spring in the region of the bend substantially corresponds to the width of the trough 9 , ie, in this area, the full available space is optimally utilized. This is especially true of the installation situation of 20 seen. Only in the engaging in the trough area, the leaf spring tapers 4 then in the area of her thighs 6 . 7 essentially to the inner width of the trough 9 , The width of the trough 9 Corresponds essentially with the width of the leaf spring 4 so this in the trough 9 fills the free U-shaped cross section and from a longitudinal leg 12 to the other longitudinal leg 13 extends. This in turn is the entire width of the clamping leg for inserting a conductor with a maximum of this width corresponding diameter available. On the side walls of the trough 9 the conductor can not avoid and is held securely.

The clamping leg 7 again lies on a busbar piece 18 to that for contact optimization with a punched out 60 with a clamping edge 61 is provided that optimizes the conductor contact.

From the two longitudinal legs 12 . 13 of the trough 9 are at the free ends of the longitudinal legs 12 . 13 in each case in the region in which the first spring leg 6 engages in the trough, on punching lobes 14 . 15 bent inwards from the busbar (in 18 only one of the two lobes is visible).

These rags 14 . 15 close each here to slots 66 in which the spring 4 engages with their full width in this area width in the edge region, so that the leaf spring 4 in this embodiment substantially in the region of these slots 66 held and supported. Almost all of the forces involved in inserting a conductor are supported in this area. The inwardly bent rags 14 . 15 have a stabilizing effect and, in an advantageous multiple function, additionally support the busbar section 18 in the trough axially adjacent next port and support this ( 19 ). In addition, the busbar pieces 18 supported with their out of the trough projecting areas in Isolierstoffgehäuse, such as in a terminal block housing - 19 - that has a supporting edge 62 having.

indentations 63 in the longitudinal thighs 12 . 13 or side walls of the trough 19 , which are in corresponding lateral recesses 64 in the one leg of the leaf spring 4 engage, secure them against unintentional pulling up from the trough 9 , One in a lower opening of the base leg of the trough 9 engaging lower narrower end area 65 the leaf spring 4 , which preferably does not project beyond the lower edge of the base leg, additionally prevents unintentional rotation of the leaf spring 4 around the area of their support in the slots 66 in the side walls or longitudinal legs 12 . 13 of the trough, where the leaf spring 4 is held securely and the forces acting upon insertion of a conductor forces are supported.

Since there are two large side walls, the situation is at its root 39 of the trough 9 unlike other constructions eg with passage at the bottom of the trough uncritical. The side walls or longitudinal legs 12 . 13 always ensure a sufficient current carrying capacity and still take over the holding and Ausziehsicherungsfunktion. Although these functions raise some constraints on the design of the longitudinal leg. However, this is not critical, as it is still due to the longitudinal legs 12 . 13 a sufficient cross-section is available.

Finally, it should be mentioned that the leg 6 the leaf spring 4 a grading 67 which greatly simplifies automatic assembly since it forms a distinguishing feature which distinguishes between the differently shaped legs - clamping legs and holding legs - 6 . 7 and thus the orientation of the leaf spring 4 relieved during assembly.

1

connecting device

2

conductor end

3

conductor rail

4

leaf spring

5

nip

6

spring leg

7

spring leg

8th

metal sheet

9

trough

10

cloth

11

recess

12.13

longitudinal leg

14.15

cloth

16.17

recesses

18

Busbar approach

19

recess

20.21

Contact humpback

23

outs

24

plug

25

Insulated

26

PCBs

27

bend

28

flattening

29a, b

Stege

30.31

openings

32

screwdriver

33

solder tail

34

drilling

35

About housing

36.37

openings

38

conductor rail

39

base leg

40

head Start

41

recess

42

cloth

43

cloth

44

recess

45

approach

46

recess

53

leaf spring

55

nip

56

first spring leg

57

recess

58

loop

59

clamping leg

60

punching

61

clamping edge

62

supporting edge

63

indentations

64

recesses

65

end

67

gradation

68

wall

Claims (30)

Connecting device ( 1 ) for connecting a stripped conductor end ( 2 ), with a) at least one leaf spring acting as a compression spring on the conductor end ( 4 . 53 ) for clamping the conductor end ( 2 ) on a busbar ( 3 ), b) the leaf spring ( 4 . 53 ) designed and at the power rail ( 4 . 53 ) is arranged, that the conductor end ( 2 ) without actuating tool directly into the clamping point ( 5 ) is inserted without tools, characterized in that c) the busbar a channel-like, U-shaped trough ( 9 ) with a base leg ( 39 ) and two longitudinal limbs ( 12 . 13 ) and d) the arrangement and design of the leaf spring ( 4 . 53 ) is such that a conductor from a direction perpendicular to the base leg ( 39 ) of the trough ( 9 ) in the trough ( 9 ) is insertable. Connecting device according to claim 1, characterized in that on a single trough-like busbar ( 3 ) in the longitudinal direction (L) of the busbar ( 3 ) offset to each other several leaf springs in the same direction and / or in opposite directions arrangement in the trough ( 9 ) are set, so that a plurality of terminal points are formed on a single busbar. Connecting device according to claim 1 or 2, characterized in that the leaf spring ( 4 ) a V-shape with two longitudinal legs ( 6 . 7 ) having a bend ( 27 ) are interconnected. Connecting device according to claim 3, characterized in that the leaf spring ( 4 ) in the trough ( 9 ) is arranged and aligned, that the free ends of the two spring legs ( 6 . 7 ) in the trough and the bend ( 27 ) or tip at the base leg ( 39 ) of the trough ( 9 ) facing away from the trough open side 9 project upwards. Connecting device according to claim 2 or 3, characterized in that the first spring leg ( 6 ) with the second spring leg ( 7 ), the contact leg, an angle of about 30 to 60 °, includes. Connecting device according to one of the preceding claims, characterized in that from the base leg ( 39 ) of the trough ( 9 ) with its two longitudinal legs ( 12 . 13 ) a rag ( 10 ) from the base leg ( 39 ) of the trough is bent approximately vertically upwards, so that in the base leg ( 39 ) of the trough a window-like recess ( 11 ), wherein the first spring leg on the flap ( 10 ) is supported. Connecting device according to one of the preceding claims, characterized in that the width of the trough ( 9 ) substantially with the width of the leaf spring ( 4 ) corresponds, so that these in the trough ( 9 ) fills the free U-shaped cross section and from a longitudinal leg ( 12 ) to the other longitudinal leg ( 13 ). Connecting device according to one of the preceding claims, characterized in that the leaf spring ( 4 ) is slightly wider than the trough ( 9 ) and this is clamped somewhat widening in the trough. Connecting device according to one of the preceding claims, characterized in that at the free ends of the longitudinal limbs ( 12 . 13 ) of the trough ( 9 ) in each case in the region in which the first spring leg ( 6 ) from the trough ( 9 ) upwards stands, at Lappen ( 14 . 15 ) from the busbar inwards to the leaf spring ( 4 ) are bent out. Connecting device according to one of the preceding claims, characterized in that the lobes ( 14 . 15 ) in corresponding recesses ( 16 . 17 ) in the first spring leg ( 6 ) intervene. Connecting device according to one of the preceding claims, characterized in that the second spring leg ( 7 ) with its free end, which is at an angle to the base leg ( 39 ) of the trough, obliquely into the trough ( 9 ), where the free end of the second spring leg ( 7 ) on a busbar piece ( 18 ), which is integral with the trough ( 9 ) connected is. Connecting device according to one of the preceding claims, characterized in that the busbar piece of one of the two longitudinal limbs of the U-shaped trough ( 9 ) is bent inward in the direction of the trough interior. Connecting device according to one of the preceding claims, characterized in that the busbar piece ( 18 ) on the further longitudinal leg ( 13 ) Locked like a lock. Connecting device according to one of the preceding claims, characterized in that the base leg ( 39 ) of the trough ( 9 ) below the nip between the leaf spring ( 4 ) and the busbar piece ( 18 ) has a recess for receiving the conductor end. Connecting device according to one of the preceding claims, characterized in that the busbar piece from the base leg ( 39 ) of the trough ( 9 ) freed on several sides and from the base leg ( 39 ) of the trough is bent upwards. Connecting device according to one of the preceding claims, characterized in that the free end of the contact leg ( 7 ) of the leaf spring ( 4 ) with a flattening ( 28 ) is provided. Connecting device according to one of the preceding claims, characterized in that directly on the busbar ( 3 ) Soldering pins ( 33 ) are formed. Connecting device according to one of the preceding claims, characterized in that the busbar ( 3 ) in the area next to at least one of the leaf springs ( 4 ) with recesses ( 23 ) for inserting a plug ( 24 ) are provided, which is usable for the realization of a cross connection or a Prüfabgriffes. Connecting device according to one of the preceding claims, characterized in that the first spring leg ( 6 ) in his in the trough ( 9 ) engaging end portion a window-like recess ( 41 ) into which a flap ( 42 . 43 ) that extends from the base leg 39 of the trough is bent. Connecting device according to one of the preceding claims, characterized in that the flap ( 42 ) is bent into a z-shape. Connecting device according to one of the preceding claims, characterized in that the recess ( 44 ) at the level of the base leg ( 39 ) s of the trough and the lobe ( 43 ) is bent in the plane of the base leg of the trough, so that the first spring leg in mounted position of the spring slightly above the base leg ( 39 ) of the trough ( 9 ) protrudes downwards or outwards. Connecting device according to one of the preceding claims, characterized in that the leaf spring ( 53 ) forms a self-contained loop. Connecting device according to one of the preceding claims, characterized in that the leaf spring has a first spring leg ( 56 ), which with a window-like recess ( 57 ) and on the edges of the longitudinal limbs ( 12 . 13 ) is placed, wherein the loop from the first spring leg in an arc to the window-like recess ( 57 ), which has a free clamping leg ( 59 ) interspersed. Connecting device according to one of the preceding claims, characterized in that the loop ( 58 ) has an elongated shape and inclined to the conductor insertion direction (L) is aligned, in particular such that the angle α between the clamping leg and the conductor insertion (L) is less than 45 °, in particular less than 30 °. Connecting device according to one of the preceding claims, characterized in that the leaf spring ( 4 ) exclusively on its first spring leg ( 6 ) in the busbar ( 3 ) and that the busbar ( 3 ) is formed as a punched / bent part. Connecting device according to one of the preceding claims, characterized in that the leaf spring ( 4 ) on the longitudinal legs ( 12 . 13 ) of the trough is held. Connecting device according to one of the preceding claims, characterized in that the two longitudinal limbs ( 12 . 13 ) of the trough ( 9 ) at the free ends of the longitudinal legs ( 12 . 13 ) on punching lobes ( 14 . 15 ) are bent inwards from the busbar, which are connected to slots ( 66 ) into which the spring ( 4 ) engages, so that the leaf spring is held and supported in the region of these slots. Connecting device according to one of the preceding claims, characterized in that indentations ( 63 ) in the longitudinal limbs ( 12 . 13 ) of the trough ( 9 ) formed in corresponding lateral recesses ( 64 ) in the retaining leg ( 6 ) of the leaf spring ( 4 ) intervene. Connecting device according to one of the preceding claims, characterized in that a lower opening ( 11 ) of the trough ( 9 ) engaging lower end region ( 65 ) of the leaf spring ( 4 ) secures them against twisting. Connecting device according to one of the preceding claims, characterized in that one of the legs of the leaf spring has a graduation ( 67 ) having.