DE202020100409U1 - Electrical connection terminal - Google Patents

Abstract

Electrical connection terminal (10)
- With a contact cage, which has a contact base (21), a contact cover (23) and two contact base (21) and contact cover (23) interconnecting contact side walls (22), wherein
- Contact base (21), contact cover (23) and contact side walls (22) together form a conductor insertion channel (24),
- With a conductor clamping connection, which is formed by at least one clamping spring (30) pretensioned against an abutment,
- With an insertion bevel for a conductor formed in the area of the contact cover (23), characterized in that the insertion bevel is formed by a guide wing (33) which arises from the contact cover (23) in the direction of insertion of the conductor (x) and which in the direction of the contact base (21 ) is inclined.

Description

The invention relates to an electrical connection terminal with a contact cage which has a contact base, a contact cover and two contact side walls connecting the contact base and contact cover, the contact base, contact cover and contact side walls jointly forming a conductor insertion channel, with a conductor terminal connection which is biased by at least one against an abutment Clamping spring is formed, and with a lead-in chamfer formed in the area of the contact cover for a conductor.

A generic electrical connector is for example from the EP 3 159 974 A1 known. This is a connection terminal for arrangement on a circuit board. For this purpose, the contact base of the contact cage forms a connection area at its front and rear end, as seen in the direction of insertion of the conductor, which is contacted with the circuit board, in particular by a soldered connection.

A connection conductor can be inserted into the conductor insertion channel with its stripped end first. The conductor insertion channel serves to feed the conductor to a clamping point in which it is held. The clamping point can be opened using a release tool which can be inserted into a joint between the clamping spring and the counter bearing, whereby the clamping spring is separated from the counter bearing against spring preload. This makes it possible to remove a conductor seated between the abutment and the clamping spring from the connection terminal. However, it is also possible to open the clamping point in this way in order to insert a conductor into the clamping point essentially without resistance. This is intended in particular for multi-wire conductors in order to avoid the free insertion of the free conductor insertion end.

In order to ensure correct conductor routing in the vertical direction, that is to say in the direction of a vertical plane extending between the contact base and the contact cover, a connection to the connecting terminal according to FIG EP 3 159 974 A1 belonging insulating housing from an arranged in the area of the contact cover inclined insertion. This is designed inclined from the contact cover to the contact base in the direction of the clamping point.

This basically achieves the goal of reliably feeding the conductor to the terminal point through the inclined surface formed by the insulating housing. However, the proposed solution is very complex to manufacture. Generic connection terminals often measure no more than 3 to 4 mm in width with approximately the same height and a length of about 8 mm. Because of these very small dimensions, the insulating housing enclosing the connection terminals can be manufactured with high precision, especially if they also have a conductor-leading function.

The object of the invention is therefore to provide a generic connection terminal with a guiding function which can be manufactured more simply and efficiently.

The invention is solved by a connecting terminal with the features of claim 1, in particular with its characteristic features, according to which the lead-in chamfer is formed by a guide wing which arises from the contact cover in the direction of the conductor insertion and which is designed to be inclined in the direction of the contact base.

The particular advantage of the subject matter of the invention can be seen in the fact that the guide wing forming the lead-in chamfer is formed by the contact cage of the connecting terminal itself, that is to say by the metallic contact material. This makes the conductor routing to the terminal point independent of any insulation housing. In this respect, the connection terminal according to the invention can be used with or without an insulating material housing.

It is provided that the conductor clamping connection is formed by a clamping spring originating from the first contact side wall in the conductor insertion direction and a counter bearing originating from the second contact side wall in the conductor insertion direction.

The counter bearing can be a rigid wall section, for example connected to the contact base. In a preferred embodiment, the counter bearing is designed as a second clamping spring, both clamping springs being biased in the direction of a vertical longitudinal contact center plane, that is to say are biased against one another. The free ends of the clamping springs lie against each other and can also have a molded clamping wedge. If a clamping wedge is present, the clamping wedges of both clamping springs point towards one another.

It is also provided that the clamping spring and / or the counter bearing have tool attacks for opening the clamping point.

This ensures that the clamping point can be opened in order to remove a conductor seated there from the connection terminal or else to insert the clamping point into the clamping point without resistance for inserting a conductor, for example a multi-wire conductor.

It is also provided that the guide wing has a free end facing away from the contact cover, which is arranged in the direction of insertion of the conductor before the tool attack.

This embodiment first ensures that the guide wing does not hinder a tool attack for opening the clamping point.

In addition, if it is ensured that the clamping spring and / or the counter bearing serve as a support for the guide wing, it is also ensured that the guide wing cannot get between the clamp springs - possibly after being spread by an opening tool - and thus prevents the clamping point from closing.

It is further provided that the conductor insertion channel has a substantially rectangular cross section, in which the contact side walls are aligned vertically to the contact base and contact cover.

In this embodiment, the contact base and contact cover, as well as the contact side walls, are essentially non-curved. The contact frame, which is usually formed from a piece of sheet metal, only bends in the corner areas forming the transition between wall and floor or wall and ceiling, which is solely for reasons of production technology.

The main advantage of this embodiment is that, compared to a round-shaped conductor insertion channel, a larger cross-section is available with the same external dimensions in terms of height and width. This facilitates the automated insertion of connection leads. In addition, both the clamping springs or clamping spring and counter bearing as well as the guide wing can be more easily molded onto non-curved wall, ceiling and floor sections of the conductor insertion channel, since both the clamp springs and the guide wing can usually only have their optimal technical effect if it is uncurved components.

The invention further proposes that the contact cover is only connected on one side to the first or second contact side wall, it being alternatively possible for the contact cover to be formed in two parts with a parting line oriented in the direction of insertion of the conductor, the guide wing being connected only to one of the contact cover parts .

The joint that is usually unavoidable when forming a connection terminal from a sheet metal strip can be optimally applied in the area of the contact ceiling, since - unlike the contact side walls - no forces caused by the terminal point act here.

• 1: eine schematisch dargestellte Platine mit zwei nebeneinander angeordneten, erfindungsgemäßen Anschlussklemmen,
• 2: die Darstellung gemäß 1 unter Ergänzung eines Anschlussleiters und Weglassen der Isolierstoffgehäuse,
• 3: eine elektrische Anschlussklemme mit eingesetztem Anschlussleiter,
• 4: die Darstellung gemäß 3, jedoch ohne Anschlussleiter,
• 5: eine Schnittdarstellung gemäß Schnittebene A - A in 1,
• 6: eine Schnittdarstellung gemäß 5 unter Weglassung der Platine.

Further advantages of the invention and a better understanding follow from the following description of an exemplary embodiment. Show it:

• 1 1 shows a schematically illustrated circuit board with two connecting terminals according to the invention arranged next to one another,
• 2nd : the representation according to 1 by adding a connecting conductor and omitting the insulating material housing,
• 3rd : an electrical connection terminal with inserted connection conductor,
• 4th : the representation according to 3rd , but without a connecting conductor,
• 5 : a sectional view according to section plane A - A in 1 ,
• 6 : a sectional view according to 5 omitting the board.

In the figures, an electrical connection terminal according to the invention is generally designated by the reference number 10th Mistake.

In 1 carries the connection terminal 10th an insulating housing 11 and is on a schematically illustrated circuit board 12th put on.

The insulating housing 11 has a collar 13 which one from the insulating material housing 11 trained conductor insertion recess 14 surrounds that of the conductor insertion opening 15 the connection terminal 10th in the direction of insertion x is upstream.

In addition, the insulating material housing 11 in its top wall 16 via a tool recess 17th , via which a tool, not shown, into the insulating housing 11 is insertable to a nip 18th the connection terminal 10th to open.

At the end facing away from the collar there is an insulating housing 11 over a back wall 19th . In addition, the insulating housing 11 two opposite side walls 20th on.

4th shows the connection terminal 10th alone. The connection terminal 10th has a contact base 21 on which two contact side walls 22 are integrally formed and are approximately vertical with respect to the contact base 21 extend upwards. A contact blanket 23 is on the contact side walls 22 molded and approximately parallel to the contact base 21 aligned. The contact floor 21 surrounds with the contact sidewalls 22 and the contact blanket 23 a conductor insertion channel 24th .

The contact floor 21 has at its the conductor insertion opening 15 of the conductor insertion channel 24th in the direction of insertion x upstream end via a first contact foot 25th and on his in the direction of insertion x the conductor insertion channel 24th downstream end via a second contact foot 26 . The first and second contact feet are arranged in a common plane. On the same level as the contact feet 25th and 26 is also the section of the contact base 21 located by the canal floor 27 of the conductor insertion channel 24th trains. Between the channel floor 27 and the one at the rear end of the connector 10th located second contact foot 26 is the contact floor 21 opposite the level of the contact feet 25th , 26 raised towards the contact blanket.

The contact sidewalls 22 arise from that the channel floor 27 of the contact floor 21 forming section and extend in their direction of insertion x measured length not over the length of the channel floor 27 out. So far you can see the contact side walls 22 also referred to as channel side walls.

The contact cover extends in the same way 23 over a length corresponding to the length of the duct floor in the direction of insertion of the conductor x so that the contact blanket 23 can also be called a duct ceiling.

The canal ceiling 23 is formed in two parts, one between the two ceiling parts in the direction of insertion x running parting line 28 extends.

The cross section of the conductor insertion channel 24th is essentially rectangular, in a preferred embodiment approximately square. The canal side walls 22 , the canal floor 21 like the canal ceiling 23 are essentially uncurved. You only experience a curvature in the corner areas, in which the channel side walls 22 in the channel floor 21 or the duct ceiling 23 pass over. These radii are mainly due to manufacturing reasons. These are the bending radii used in the manufacture of the connection terminal 10th originate from a metallic die-cut in a stamping-bending process.

The rectangular, preferably square cross section of the conductor insertion channel 24th has the considerable advantage that the cross-sectional area compared to a round, in particular circular conductor insertion channel 24th until the same external dimensions in terms of width and height is larger. This facilitates the mechanical insertion of connection conductors, since somewhat larger tolerances with regard to the positioning of the insertion tool relative to the connection terminal are possible.

The channel or contact side walls 22 arise in the direction of insertion of the conductor x two clamping springs 30th whose free ends are in the area of a wire insertion direction x vertical longitudinal median plane (not shown) of the connection terminal 10th meet. In a preferred embodiment, the free ends of the clamping legs that meet each other are spring-loaded. However, it is sufficient if the clamping springs 30th with their free ends sufficiently close together. Depending on the conductor cross-sections provided, even a gap between the free ends is tolerable. The clamp springs 30th form the nip 18th the connection terminal.

Each clamping spring extends upwards, i.e. facing away from the contact floor 30th one tool attack each 31 . These are expansion tongues that are slightly exposed to the outside 32 . An opening tool (not shown in further detail) can be pushed between these around the clamping springs 30th spread apart and so the nip 18th to open without resistance or to remove a connection conductor.

To ensure that the connection conductor is safely fed to the terminal point 18th to ensure, arises from the contact or channel ceiling 23 a leading wing 33 in the direction of insertion x and is from the place of its connection to the contact ceiling 23 out towards the contact floor 21 executed inclined. As a result, the free end of the guide wing lies 33 the contact floor 21 closer than that on the contact blanket 23 tied leading wing root.

In the embodiment in which the contact or channel cover 23 is made in two parts, the leading wing arises 33 only the first part of the ceiling 34 . The second part of the ceiling 35 is held without a wing. The leading wing 33 nevertheless spans the channel width, so that a conductor to be plugged in the channel or the conductor insertion channel 24th downstream clamping area cannot go upwards, i.e. in the direction away from the channel floor.

The leading wing 33 can on the clamp springs 30th rest, which then form a support. This has the main advantage that the maximum possible inclination of the guide wing 33 towards the contact floor 21 can be used for conductor routing. As can also be seen, the free end of the guide wing is located 33 in the direction of insertion x before the tool attacks 31 of the clamping springs 30th , so that free access to the tool attacks 31 is guaranteed. In addition, the leading wing experiences 33 in its near the free end End section a trapezoidal extension to at maximum opening of the nip 18th entry of the free guide wing end into the clamping point 18th to avoid, as this will reset the spread, open clamping springs 30th prevent and thus the defect of the connection terminal 10th would mean.

3rd now shows a representation accordingly 4th , only that here is a connecting conductor 36 , a cable with stripped end, in the direction of conductor insertion x through the conductor insertion opening 15 and the conductor entry channel 24th down to the terminal point 18th was inserted. This has the clamping springs 30th experience a spread to the outside, whereby a spring tension has been built up, which is opposite to the spreading movement. The unspecified clamping edges of the clamping springs 30th are located on the stripped end of the connection conductor 36 and hold it against retraction forces in the clamping point 18th firmly.

2nd shows again a representation corresponding to the 1 , but omitting the insulating housing 11 . Here, the aforementioned connection conductor was placed in one of the two connection terminals 36 used. The connection terminals 10th sit with their contact feet 25th and 26 on connecting surfaces 37 the circuit board 12th and are attached there in an electrically contacting manner, for example by a soldering process.

The 5 and 6 show the connection terminal 10th in addition to insulating housing 11 and circuit board 12th in a sectional view according to the cutting line (plane) AA in 1 . From these representations it is very clear that the collar first 13 of the insulating housing 11 the conductor insertion opening 15 or the conductor insertion channel 24th the connection terminal 10th in the direction of insertion x is upstream. It can also be seen that the tool recess 17th of the insulating housing 11 above the tool attacks 31 of the clamping springs 30th is arranged so that through the tool recess 17th a release tool in the clamping point 18th can be introduced.

Either 5 as well as 6 show again the inclination of the guide wing 33 towards the contact floor 21 and the associated leading effect for a connecting conductor 36 towards the clamping point 18th . Thanks to the guide wing 33 is a dodging of the connection conductor 36 , especially his the nip 18th supplied, stripped end up towards the insulating housing 11 locked out. In this respect, there is a secure contact between the connection terminal 10th and connecting conductor 36 in the nip 18th ensured.

Reference list

10th

Connection terminal

11

Insulating housing

12th

PCB / circuit board

13

Collar of 12th

14

Conductor insertion recess

15

Conductor insertion opening

16

Top wall

17th

Tool recess

18th

Nip from 10th

19th

Back wall of 11

20th

Side wall

21

Contact floor

22

Contact sidewall

23

Contact blanket

24th

Conductor entry channel

25th

first contact foot

26

second contact foot

27

Canal floor

28

Parting line

30th

Clamping spring

31

Tool attack

32

Spread tongue

33

Guide wing

34

first part of the ceiling

35

second part of the ceiling

36

Connection conductor

37

Pad

x

Direction of insertion

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 3159974 A1 [0002, 0004]

Claims (8)

Electrical connecting terminal (10) - with a contact cage which has a contact base (21), a contact cover (23) and two contact base (21) and contact cover (23) connecting side walls (22), - contact base (21), contact cover ( 23) and contact side walls (22) together form a conductor insertion channel (24), - with a conductor clamping connection, which is formed by at least one clamping spring (30) pretensioned against an abutment, - with an insertion slope for a conductor, which is formed in the area of the contact cover (23) , characterized in that the lead-in bevel is formed by a guide wing (33) which arises from the contact cover (23) in the direction of insertion of the conductor (x) and which is inclined in the direction of the contact base (21). Electrical connection terminal (10) after Claim 1 , characterized in that - the conductor clamping connection is formed by a clamping spring (30) originating from the first contact side wall (22) in the conductor insertion direction and a counter bearing originating from the second contact side wall (22). Electrical connection terminal (10) after Claim 1 or 2nd , characterized in that the clamping spring (30) and / or the counter bearing have tool attacks (31) for opening the clamping point. Electrical connection terminal (10) after Claim 3 , characterized in that the guide wing (33) has a free end facing away from the contact cover (23), which is arranged in the direction of insertion of the conductor before the tool engagement (31). Electrical connection terminal after Claim 2 , characterized in that the clamping spring (30) and / or the counter bearing serve the guide wing (33) as a support. Electrical connection terminal (10) according to one of the preceding claims, characterized in that the conductor insertion channel (24) has a substantially rectangular cross section, in which the contact side walls (22) are aligned vertically to the contact base (21) and contact cover (23). Electrical connecting terminal (10) according to one of the preceding claims, characterized in that the contact cover (23) is only connected on one side to the first or second contact side wall (22). Electrical connection terminal (10) according to one of the Claims 1 to 6 , characterized in that the contact cover (23) is formed in two parts with a parting line (28) oriented in the direction of insertion of the conductor, the guide wing (33) being connected only to one of the contact cover parts (23).

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