CN110854554B

CN110854554B - Wire connecting terminal

Info

Publication number: CN110854554B
Application number: CN201911035963.4A
Authority: CN
Inventors: 亨利·施托尔策
Original assignee: Wago Verwaltungs GmbH
Current assignee: Wago Verwaltungs GmbH
Priority date: 2015-09-18
Filing date: 2016-09-14
Publication date: 2022-02-25
Anticipated expiration: 2036-09-14
Also published as: KR20170034323A; EP3145031A2; CN110854554A; CN107017475B; JP6888927B2; CN107017475A; TWI706612B; EP3145031B1; DE202015104962U1; TW201712954A; JP2017076606A; KR102646639B1; EP3145031A3

Abstract

The invention relates to a conductor terminal contact element (1) for clamping an electrical conductor (20), comprising a busbar (2) and a clamping spring element (3), wherein the clamping spring element (3) has a spring tongue (8) with a clamping edge (15), and wherein the clamping edge (15) forms a clamping point for clamping the electrical conductor (20) with a clamping section of the busbar (2). The clamping spring element (3) is characterized in that it is movably arranged on the bus bar (2) and the spring tongue (8) has a bearing (12) which is designed to be placed on the bus bar (2) and to cause the opening of the clamping point by a movement of the clamping edge (15) away from the clamping section during an opening movement of the clamping spring element (3) relative to the bus bar (2).

Description

Wire connecting terminal

The application is a divisional application of a patent application with the application date of 2016, 9, 14, the application number of 201610826889.8 and the name of 'wire connecting terminal'.

Technical Field

The invention relates to a conductor connecting terminal for clamping an electrical conductor, comprising a bus bar and a clamping spring element. The clamping spring element has a clamping edge, which forms a clamping point for clamping the electrical conductor together with the clamping section of the busbar. The clamping edge can be located on the spring tongue.

Background

Such wire terminal contact elements are used in a variety of forms. The conductor terminal contact element according to the invention is essentially designed and designed to be placed directly on a circuit board and soldered to the circuit board in order to produce a circuit board contact for clamping an electrical conductor by means of a spring terminal. The conductor terminal contact element is particularly suitable for use without a surrounding insulating housing.

DE 202013105670U 1 shows a terminal for a light-emitting diode having an insulating housing provided with a push key and a plurality of electrically conductive contact elements in the insulating housing. The contact unit is composed of two metal strips. The first metal strip has an upwardly projecting metal wall which is formed so as to be bent in a semicircular shape on the upper side. The second metal strip is connected at one end thereof to the upper end of the first metal strip and is provided at the other end thereof with two branch tongues. One of the branching tongues is provided for clamping an electrical conductor. The other branching tongue is aligned with the push key so that the push key can be pushed onto the second metal strip in order to open the clamping point formed by the first branching tongue and the first metal strip for clamping the electrical line.

WO 2014/124475 a2 discloses a connecting terminal or connecting terminal for electrically connecting at least one line to an electrical contact. The terminal has an insulating housing in which a contact body is provided. The contact body has a stamped part with a bore and a spring element arranged in the bore. The spring element is designed as a U-shaped bent yoke spring having a support section, a spring bend connected to the support section, and a clamping leg which lies opposite the support section and is connected to the spring bend. The contact leg is located on the bottom section of the stamping part. The clamping legs are oriented toward the cover section of the stamping part in order to form clamping points for clamping the electrical lines. In order to open the clamping point, an actuating tool can be placed on the clamping leg through an opening in the insulating housing in order to move the clamping leg away from the cover section of the stamping.

Disclosure of Invention

In this respect, the object of the invention is to provide an improved conductor terminal contact element for clamping an electrical conductor.

The object is achieved by means of a conductor terminal contact element for clamping an electrical conductor, advantageous embodiments of which are described below.

In the case of a conductor terminal contact element having a busbar and a clamping spring element, it is proposed that the clamping spring element be movably arranged on the busbar and that the spring tongue have a bearing which is designed for resting on the busbar and, in the event of an opening movement of the clamping spring element relative to the busbar, opens the clamping point by a movement of the clamping edge away from the clamping section.

In conjunction with the movability of the clamping spring element, the support on the spring tongue achieves that the clamping point formed between the spring tongue and the bus bar for clamping the electrical conductor opens when the clamping spring element is moved in the opening movement. By means of this movement, the abutment comes into an abutment position or stop position on the bus bar, so that a further opening movement of the clamping spring element relative to the bus bar causes an opening movement of the spring tongues subsequently seated on the bus bar. In this case, the clamping edge of the spring tongue is moved away from the clamping section of the bus bar in order to open a clamping point formed between the clamping edge and the clamping section for clamping the electrical conductor.

In order to open the clamping point, an actuating force is not easily applied to the clamping spring element which is firmly seated on the bus bar, in order thereby to move the spring tongue directly. But rather by leverage caused by the abutment on the spring tongue. By means of the abutment, a fixing point is provided in the opening movement of the clamping spring element, about which fixing point the spring tongue pivots.

Thus, a compact and very simple and reliable handling of the wire terminal contact element is achieved.

The abutment of the spring tongue can be designed as at least one projection projecting laterally from the spring tongue for resting on an associated edge of a side wall section of the bus bar. The projection is thus formed in a simple manner, for example, in a form-fitting manner with the spring tongue material.

The bus bar can have a bottom section and two side wall sections which project from the bottom section and are spaced apart from one another. The clamping spring element therefore has a side wall which is supported on the side wall section of the bus bar and a first crosspiece which connects the side wall. The spring tongues thus project from the crosspiece toward the bottom section into the intermediate space between the side wall sections of the bus bar.

A U-shaped conductor guide channel is provided by means of the bottom section and the spaced-apart side wall sections of the bus bar. The side wall sections of the bus bar serve, inter alia, to support the clamping spring elements. This is achieved in that the side walls of the clamping spring element bear against the side wall sections of the bus bar and are thus also guided. The first crosspiece serves as a foot section for the spring tongue and at the same time provides an actuating surface to which an actuating force for the opening movement of the clamping spring element can be applied.

The side wall can be connected to a further second cross piece, which is spaced apart from the first cross piece. Thus, the clamping spring element is further stabilized.

Advantageously, the second cross piece is located on the same side as the first cross piece. A cage-like clamping spring element is thus realized, wherein the spring tongues project between the side walls of the clamping spring element towards opposite sides into the intermediate space between the crosspieces.

The clamping spring element can have a bearing finger which projects from the clamping spring element and projects into a bearing opening of the busbar. The support opening can thus be present, for example, on a side wall section of the bus bar. The clamping spring element can therefore be suspended by means of the bearing fingers on the clamping spring element in order to be mounted there so as to be movable about the bearing fingers forming the pivot axis. By virtue of the fact that the supporting fingers are exposed from the plate material of the clamping spring element and project from the plane, they can be formed in one piece with the clamping spring element in an inexpensive and simple manner.

The bus bar can have a contact protrusion protruding around a plane of the bus bar. By means of the contact projections, a reduced contact surface is achieved, onto which the electrical conductor to be clamped is placed and onto which the spring force of the clamping spring element is concentrated. In this way, the surface pressure is increased and the contact resistance is improved.

The contact projection can be configured, for example, as a projecting contact tab which emerges from the base section of the busbar. This has the advantage that a clamping edge is provided by means of the free end of the contact web, on which clamping edge the electrical conductor to be clamped is clamped and hooked. Thus, the clamping of the electrical conductor is improved. Furthermore, a funnel-shaped wire insertion is provided by means of the projecting contact lugs, which are formed together on the opposite side by a spring tongue which likewise runs obliquely.

The bus bar and the clamping spring element can each be a plate element which is bent in cross section into a U-shape. The plate elements bent into a U-shape are thus arranged overlapping each other to form a circumferentially closed cage. The U-shaped bus bar can therefore be inserted into the opening of the U-shaped clamping spring element or vice versa. The clamping spring element is thus supported on the bus bar in a rotationally fixed manner, wherein the side wall sections and the side walls adjoining one another form a guide. The clamping spring element can now only be moved either by pivoting about the bearing axis or the floating bearing, or by sliding along the bus bar in the direction of the bottom section, or by means of a combined pivoting and sliding movement.

The clamping spring element can be mounted pivotably on the bus bar on a pivot bearing. It is therefore advantageous if the axis of the pivot bearing, viewed in the direction of extension of the spring tongue, is located behind the freely movable end of the spring tongue. The clamping spring element can thus be pivoted on the one hand about the axis of the pivot bearing. On the other hand, the spring tongue rests on the bus bar during the opening movement by means of the abutment. Two fastening points are thus provided by the pivot bearing and the abutment, which fastening points cause an opening movement of the spring tongue when the opening movement is further performed toward the clamping spring element.

The object is also achieved in that the clamping spring elements are movably arranged on the bus bar, and the bus bar and the clamping spring elements are each plate elements which are bent into a U-shape in cross section, wherein the plate elements bent into a U-shape are arranged overlapping one another to form a cage which is closed on the circumferential side. In principle, therefore, irrespective of the possible design of the clamping point, the electrical conductor can be introduced into the cage space of the very compact conductor terminal contact element and clamped there at the clamping point. Due to the relative mobility between the clamping spring element and the bus bar, the clamping point can be opened and, if appropriate, also closed for removing and, if appropriate, also for clamping the electrical line.

The cage can be formed in that the bus bar has a base section and two side wall sections which project from the base section and are spaced apart from one another, and the clamping spring element has a side wall which is supported on the side wall sections of the bus bar and a first crosspiece which connects the side wall.

The clamping spring element can have a spring tongue and is in turn arranged movably on the bus bar. The spring tongues project from the first crosspiece toward the bottom section into the intermediate space between the side wall sections of the bus bar.

In this variant, it is also advantageous if the bus bar has a contact projection which projects out of the plane of the bus bar. The contact projection can be designed as a contact tab which emerges from the base section of the busbar and projects.

In this variant, the clamping spring element can also be mounted on the bus bar in a pivotable manner on the pivot bearing, independently of the design of the clamping point. The axis of the pivot bearing is located behind the clamping point in the wire insertion direction. The pivot bearing can be formed by at least one bearing finger of the clamping spring element projecting into an associated bearing opening of the bus bar.

Drawings

The invention is explained in detail below on the basis of embodiments with the aid of the attached drawings. The figures show:

figure 1 shows a perspective view of a wire terminal contact element;

figure 2 shows a side view of the wire terminal contact element of figure 1;

figure 3 shows a side view in longitudinal section of the wire terminal contact element of figure 2;

FIG. 4 shows a longitudinal cross-sectional view of the electrical lead of FIG. 3 in an open state with an inserted electrical lead;

figure 5 shows a perspective view of a bus bar of the wire terminal contact element of figure 1;

figure 6 shows a perspective view of a clamping spring element for the wire terminal contact element of figure 1.

Detailed Description

Fig. 1 shows a perspective view of a conductor terminal contact element 1, which is formed in a cage-like manner from a busbar 2 and a clamping spring element 3. The bus bar 2 is integrally formed from a plate. The bus bar has a bottom section 4 from which project

side wall sections

5a, 5b spaced apart from one another on mutually opposite sides. The side wall section extends substantially over the length of the bottom section 4. In this way, the cross section of the bus bar 2 forms a U or basin shape.

Likewise, the clamping spring element 3 has opposing

side walls

6a, 6b, which are connected to one another in the front region by a first crosspiece 7a and in the rear region by a second crosspiece 7 b. The spring tongue 8 projects from the first crosspiece 7a in the direction of the base section 4 of the bus bar 2 into the intermediate space between the first and

second crosspieces

7a, 7 b. The spring tongue 8 is formed in a material-fit manner with the first crosspiece 7 a.

It is clear that the clamping spring element 3 is attached to the bus bar 2 or the bus bar 2 is inserted into the clamping spring element 3. The

side walls

6a, 6b overlap the associated

side wall sections

5a, 5b of the bus bar 2 in pairs. The clamping spring element 3 is thereby guided on the bus bar 2. The clamping spring element is movable relative to the bus bar 2. The support fingers 9 project from the

side walls

6a, 6b into associated support openings 10 of the

side wall sections

5a, 5b of the bus bar 2. A floating pivot bearing is provided by the bearing fingers 9 and the associated bearing openings 10 located below the second crosspiece 7 b. The front support finger 9 located below the first crosspiece 7a is freely movable when the bus bar 2 is relatively widely open and forms a stop with the stop edges on the

side wall sections

5a, 5b of the bus bar 2, by means of which the first crosspiece 7a is prevented from moving beyond the illustrated position away from the bottom section 4 of the bus bar 2.

The electrical line can now be introduced into the free space between the first crosspiece 7a and the base section 4 from the side below the first crosspiece 7a in the direction of the second crosspiece 7 b. The electrical conductor is then clamped at the clamping point of the conductor terminal contact element 1, which is formed by the clamping edge of the spring tongue 8 and the contact projection of the base section 4. In the exemplary embodiment shown, a contact web 11 emerges from the base section 4 of the busbar 2, said contact web rising obliquely from the plane of the base section 4 in the direction of the second crosspiece 7 b. Thus, a funnel-shaped lead-in region with a sharp-edged clamping region is provided.

Due to the electrical lines introduced, the spring tongues 8 are deflected in the direction of the plane of the

crosspieces

7a, 7 b. The spring force thus generated is supported in the respective bearing opening 10 via the two bearing fingers 9, so that the clamping spring element 3 is in a fixed, stable orientation relative to the bus bar 2.

In order to open the clamping point and remove the electrical line, the first crosspiece 7 can be pressed downward in the direction of the bottom section 4. Then, a movement of the clamping edge of the spring tongue 8 away from the base section 4 in the direction of the second crosspiece 7b of the clamping spring element 3 is effected by means of an abutment 12 on a lateral edge of the spring tongue 8, which abutment bears on the associated

marginal edge

13a, 13b of the

lateral wall section

5a, 5b during the opening movement. This is achieved by a pivot bearing of the clamping spring element 3 on the bus bar 2.

Figure 2 shows a side view of the wire terminal contact element 1 of figure 1. It is clear here that the raised support 12, which is formed so as to project laterally from the spring tongue 8, rests on the associated

edge edges

13a, 13b of the

side walls

6a, 6 b. Now, if the clamping spring element 3 is moved relative to the bus bar 2 by applying an opening movement in the direction of the bottom section 4 by means of a pressure force acting on the first crosspiece 7a, the part of the spring tongue 8 connected to the first crosspiece 7a is likewise moved in the direction of the bottom section 4. The support 12 is held in this position on the edge edges 13a, 13b of the

side wall sections

5a, 5b of the bus bar 2 in a positionally fixed manner relative to the bus bar 2. In this case, the height position perpendicular to the wire insertion direction L or the position relative to the direction of the opening movement is maintained. If necessary, it is possible within the limits of tolerances for the support 12 to slide on the edge edges 13a, 13b in the wire insertion direction L, for example as a result of a pivoting movement of the spring tongues 8. The seating of the spring tongue 8 causes the clamping edge of the freely movable end of the spring tongue 8 to obtain an opposite movement away from the base section 4 of the bus bar 2. Thus, the clamping site is opened.

It is also clear that the bus bar 2 has a wire collection pocket formed by a bent material projection 14 on the rear end, which prevents the insertion of an electrical wire beyond the end of the wire terminal contact element 1.

Fig. 3 shows a longitudinal sectional side view through the wire terminal contact element 1 of fig. 2. It is clear that the contact projection is cut out of the base section 4 in the form of a contact tab 11 and rises from the plane of the base section 4 in the direction of the second crosspiece 7 b. Together with the free end of the spring tongue 8 forming the clamping edge 15, a clamping point for clamping the electrical conductor is thus provided. The end of the contact web 11 facing the clamping edge 15 has a chamfer 16 with a plane which extends from the region of the first crosspiece 7a to the region of the bottom section 4 which is located in the wire insertion direction behind the contact web 11. Thus, an optimum contact projection for clamping the electrical line is achieved with optimum guidance of the electrical line, on which the clamping force of the spring tongue 8 is concentrated.

It is also clear that the freely movable end of the spring tongue 8 is bent further in the direction of the bottom section 4. The contact end 17 of the spring tongue 8 is therefore oriented at a steeper angle relative to the bottom section 4 than the other region of the spring tongue 8 which is connected to the first crosspiece 7 a. This results in that, during the opening movement in the direction of the bottom section 4 due to the pressure acting on the first crosspiece 7a, the contact section 17 is lifted more quickly from the bottom section 4 or the contact webs 11 than in the case of smaller angles.

It can also be seen that the support fingers 9 located below the second crosspiece 7b are supported in a floating manner in the relatively small support openings 10. Thereby, a pivoting or rotational support with a rotational axis is provided. Conversely, the bearing fingers 9 located below the first crosspiece 7a are immersed in the relatively large bearing openings 10 and are substantially freely movable. The support fingers 9 serve essentially only to provide a stop for the stop surfaces 18 of the associated

side wall sections

5a, 5 b. For this purpose, projections or fingers are provided on the

side wall sections

5a, 5b between the base section 4 and the first crosspiece 7a or the region of the spring tongue 8 connected to the first crosspiece.

By means of the support 12 resting on the edge edges 13a, 13b and by means of the at least one bearing finger 9 resting in the associated bearing opening 10, a fixed position or orientation of the clamping spring element 3 relative to the bus bar 2 is also obtained in the state in which no electrical line is inserted.

It can also be seen that the material projection 14 is bent out of at least one

side wall

5a, 5b under the second crosspiece 7b and is placed transversely in the conductor insertion channel. The end face therefore delimits the wire collection bag.

It is also clear that the base section 4 has a bevel 19 on the input end side, by means of which a funnel-shaped lead-in region is formed. Corresponding bevels are also present on the

side wall sections

5a, 5b of the bus bar 2.

This is also clear in the perspective view in fig. 1.

Fig. 4 shows a side sectional view of the wire terminal contact element 1 with the electrical wire 20 inserted so far. The stripped end 21 of the electrical line 20 is inserted into the line insertion channel in the line insertion direction L. The wire terminal contact element 1 is in the open position. Here, an opening force F is applied to the first cross web in the direction of the bottom section 4. It is clear that the contact section 17 at the freely movable end of the spring tongue 8 moves away from the contact projection at the chamfer 16 of the contact web 11. The clamping point between the clamping edge 15 and the contact projection 16 of the contact lug 11 is thus opened and the electrical conductor 20 can be pulled out of the conductor terminal contact element 1 counter to the conductor insertion direction L.

Fig. 5 shows a perspective view of the bus bar 2 used for the conductor terminal contact element 1 in fig. 1 to 4. It is clear here that the bus bar 2 is formed in one piece from a plate. Two mutually opposite

side wall sections

5a, 5b are bent out of the bottom section 4, which side wall sections provide the conductor lead-in channels. It is clear here that in the rear region of the

side wall sections

5a, 5b there are rectangular bearing openings 10, for example with rounded corners. The cross section of the support opening 10 is limited and the support opening 10 is completely closed on the circumferential side.

In contrast, in the front region, the bearing opening 10 is not completely closed on the circumferential side, but is freely accessible. This makes it possible to hook the clamping spring element 3 into the bus bar 2. It is important here that a stop is present by means of the stop surfaces 18 on the projecting projections of the

side wall sections

5a, 5 b. The stop surface 18 points in the direction of the bottom section 4.

It is furthermore clear that the material projection 14 is folded at the rear end from the two

side wall sections

5a, 5b towards each other to form a wire collection bag. Said material projection 14 of the side wall section 5a points towards the opposite side wall section 5b and vice versa.

It is also clear that the further material projection 22 is bent in the region of the free end of the contact web 11 from one

side wall

5a, 5b in each case towards the

opposite side wall

5b, 5 a. The material projection 22 is displaced upward from the plane of the base section 4 in the direction of the second crosspiece 7b and forms a seat for the contact webs 11. This is more clearly visible in figures 3 and 4.

Fig. 6 shows a perspective view of the clamping spring element 3. The clamping spring elements 3 are in turn designed as plate elements which are each bent into a U-shape in cross section. It is clear here that the support fingers 9 are cut out of the

side walls

6a, 6b and project in the direction of the

opposite side wall

6a, 6 b.

It can also be seen that the spring tongue 8 is connected to the first crosspiece 7a and extends in the free space between the first crosspiece 7a and the second crosspiece 7b down into the space between the

side wall sections

6a, 6 b. The spring tongues 8 are bent downward from the plane formed by the first and

second crosspieces

7a, 7b into the channel.

It is also clear that the abutment 12 is formed on the spring tongue 8 by a projection projecting on both sides.

Claims

1. A conductor terminal contact element for clamping an electrical conductor, having a busbar and a clamping spring element, wherein the clamping spring element has a spring tongue with a clamping edge, and wherein the clamping edge forms a clamping point for clamping the electrical conductor with a clamping section of the busbar,

it is characterized in that the preparation method is characterized in that,

the clamping spring elements are arranged movably on the bus bar and the clamping spring elements are each plate elements which are bent in a U-shaped cross section, wherein the plate elements bent in a U-shape overlap one another to form a cage which is closed on the circumferential side, wherein the clamping spring elements are pivotably supported on the bus bar at a pivot bearing, and the axis of the pivot bearing is located behind the clamping point in the wire insertion direction,

the bus bar has two side wall sections spaced apart from one another, and the clamping spring element has a side wall supported on the side wall sections of the bus bar, so that the clamping spring element is guided on the bus bar.

2. The wire terminal contact element of claim 1,

it is characterized in that the preparation method is characterized in that,

the bus bar further has a bottom section from which the two side wall sections project, and the clamping spring element further has a first crosspiece which connects the side walls, wherein the spring tongues project from the first crosspiece toward the bottom section into an intermediate space between the side wall sections of the bus bar.

3. The wire terminal contact element according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the pivot bearing is formed by a bearing finger of the clamping spring element, which finger protrudes into a bearing opening of the bus bar.

4. The wire terminal contact element of claim 2,

it is characterized in that the preparation method is characterized in that,

the side wall is connected to a second additional cross-piece, which is spaced apart from the first cross-piece.

5. The wire terminal contact element according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the bus bar has a contact protrusion protruding from a plane of the bus bar.

6. The wire terminal contact element of claim 5,

it is characterized in that the preparation method is characterized in that,

the contact projection is designed as a contact web which emerges from the base section of the bus bar and projects.