EP3707780B1 - Contact element comprising a clamping terminal for a stranded conductor - Google Patents

Description

The invention relates to an electrical contact element according to claim 1.

The invention therefore relates in particular to an electrical contact element with a connection for stranded conductors, the contact element having a specifically shaped and actuable contact spring which can be moved into a position clamping the stranded conductor and, in the clamping position, contacts the preferably stripped end of a stranded conductor in a clamping manner.

Such contact elements are intended to connect connections with stranded conductor cables that can be assembled in the field both mechanically and electrically reliably to the contact element, whereby it must also be ensured that high tensile forces, mechanical influences and vibrations must not cause unwanted separation of the connection.

For example, it is known in the prior art that stranded conductors are connected to contact elements with crimp connections or, alternatively, stranded conductors can be connected to contact elements, in which a conical contact part in a contact element presses the stranded conductors onto a correspondingly shaped counter surface by means of axially or radially acting forces, where the angles of the conical surfaces are usually the same.

In the prior art, for example, such a contact element described for connecting stranded conductors is in the DE 89 14 460 U1 disclosed.

Furthermore, in the DE 197 18 004 C1 a contact system consisting of a socket part and a plug part with spring-elastic contact lamellas is disclosed for the transmission of high currents.

In the FR 618 171 A Devices are disclosed which are suitable for clamping electrical conductors for electrical devices, in which in particular sheathed electrical conductors are clamped into insulating devices for assembly.

Furthermore, in the DE 102 20 108 B4 discloses a contact element for connecting a stranded conductor, the contact element being formed from a clamping sleeve and a mandrel-like contact part held screwably in the clamping sleeve, the contact part having a conical tip with an angle α to the vertical and a funnel-shaped connection end being viewed on the clamping sleeve, in which the stranded conductor can be inserted into an inner connection chamber and furthermore a conical surface is formed with an angle β to the vertical and the contact part can only be screwed into the connection chamber and the stranded conductor inserted therein to such an extent that between the tip of the contact part and the conical surface A minimum overlap remains on the shoulder.

This technical teaching discloses a contact element in which the stranded conductor end is pressed against a side wall by the clamping sleeve and there is a risk that the ends of the stranded conductors will be damaged or even severed during pressing. Particularly when the clamping sleeve is screwed together, high forces arise that can partially or completely shear off the stranded conductors, although in the worst case scenario this remains undetected.

From the DE 20 2016 106 269 U a resilient clamping element with a clamping spring arm for clamping contacting of a stranded conductor end between the clamping surface of a contacting section of a connection block of a contact element and the clamping spring arm is known, the clamping element having at least one holding arm with an end-side gripping section in order to secure the resilient clamping element to the connection block of the contact element with positive locking attach.

From the publications DE 101 52 519 A1 , DE 20 2015 104 962 U and EP 2 133 956 A2 Other electrical connection solutions are known.

Object of the present invention

The invention is therefore based on the object of designing a secure and easy-to-produce connection between a contact element of the type mentioned above and a stranded conductor in such a way that the aforementioned disadvantages are overcome and the stranded conductor is held in addition to an optimal electrical contact connection, in particular securely in the event of vibration influences and a high pull-out security is guaranteed in the contact element.

This task is solved by an electrical contact element with a spring part with the features of claim 1.

A basic idea of the invention is to equip a contact element with a resilient clamping element, the clamping element having a fastening arm encompassing the contact element and a clamping spring arm for contacting a stranded conductor.

In this way, the clamping element can z. B. can be attached to a contact with a screw connection block of a suitable contour and a screwless, namely clamping contact of a stranded conductor can be made with a contacting surface of the connection block.

One aspect of the invention therefore relates to a resilient clamping element with a clamping spring arm for clamping contacting of a stranded conductor end between the clamping surface of a contacting section of a connection block of a contact element and the clamping spring arm, wherein the clamping element has at least one holding arm with an end-side gripping section in order to secure the resilient clamping element to the connection block of the Attach contact element.

A further aspect of the present invention relates to an electrical contact element for the clamping connection or contacting of a stranded conductor, consisting of a contact pin and a contacting section connected thereto, which has an external clamping surface and on the outer jacket of which a resilient clamping element is attached, which has a clamping spring arm, designed for clamping contacting of a stranded conductor end between the clamping surface of the contacting section and the clamping spring arm, wherein the clamping spring arm is spring-actuated when a stranded conductor is inserted from a stranded conductor insertion position into a stranded conductor clamping position.

In a preferred embodiment of the invention it is provided that the clamping element is fastened to the contact element by means of at least one holding arm which at least partially surrounds the outside of the contacting section of the contact pin.

• der wenigstens eine Haltearm ist am Klemmelement mit einem endseitigen umgebogenen Umgriffabschnitt ausgebildet;
• die Außenkontur des Kontaktstiftes im Befestigungsbereich des Kontaktierungsabschnitt ist zylindermantelförmig oder teilzylindermantelförmig ausgebildet;
• der Klemmfederarm weist einen nicht federnden Halteabschnitt auf und ein federnder Klemmarmabschnitt des Klemmfederarms ragt in Richtung des Kontaktstifts;
• der oder die Haltearme sind als im Wesentlichen streifenförmige und endseitig umgebogene Blechzungen ausgebildet, welche mit ihrem einen Haltearmende abgewinkelt über eine Biegestelle mit dem Klemmfederarm verbunden sind;
• zwei Haltearme umgreifen den Kontaktierungsabschnitt des Kontaktstiftes mit einem Umgriffabschnitt von gegenüberliegenden Seiten, wodurch eine besonders gute Umklammerung erzielt werden kann;
• der Umgriffabschnitt ist in einer L-Form ausgebildet, so dass dieser beispielsweise auch kastenförmige Kontaktelemente umgreifen kann;
• eine Kontaktkammer (mit einem Aufnahmeraum für den Litzenleiter) ist mit einer innen liegenden Klemmfläche vorgesehen, wobei dann der Klemmfederarm durch eine Öffnung der Kontaktkammer in die Kontaktkammer hineinragt.

Further advantageous configurations and features are as follows:

• the at least one holding arm is formed on the clamping element with a bent wrap-around section at the end;
• the outer contour of the contact pin in the fastening area of the contacting section is designed to be in the shape of a cylinder jacket or partially in the shape of a cylinder jacket;
• the clamping spring arm has a non-resilient holding portion and a resilient clamping arm portion of the clamping spring arm projects in the direction of the contact pin;
• the holding arm or arms are designed as essentially strip-shaped sheet metal tongues with bent ends, which are connected at an angle to the clamping spring arm at one end of the holding arm via a bending point;
• two holding arms encompass the contacting section of the contact pin with a gripping section from opposite sides, whereby a particularly good grip can be achieved;
• the gripping section is designed in an L-shape, so that it can also grip around box-shaped contact elements, for example;
• a contact chamber (with a receiving space for the stranded conductor) is provided with an internal clamping surface, the clamping spring arm then protruding into the contact chamber through an opening in the contact chamber.

Fig. 1a bis 1d

eine erste Ausführungsform eines Kontaktelementes mit einer Ausgestaltung eines Klemmelements;

Fig. 2a bis 2d

eine zweite Ausführungsform eines Kontaktelementes mit einer Ausgestaltung eines Klemmelements;

Fig. 3a bis 3d

eine dritte Ausführungsform eines Kontaktelementes mit einer Ausgestaltung eines Klemmelements;

Fig. 4a bis 4d

eine vierte Ausführungsform eines Kontaktelementes mit einer Ausgestaltung eines Klemmelements;

Fig. 5

eine alternative Ausführungsform eines Kontaktelements in einer Schnittansicht;

Fig. 6

das Kontaktelement gemäß Figur 5 in einer perspektivischen Ansicht;

Fig. 7

eine Ausführungsform eines Klemmelements;

Fig. 8

eine erste Ausführungsform eines erfindungsgemäßen Kontaktelements in einer Schnittansicht;

Fig. 9

das Kontaktelement gemäß Figur 8 in einer perspektivischen Ansicht;

Fig. 10

das Klemmelement gemäß Figur 8

The invention is explained below using a preferred exemplary embodiment (shown in the Figures 8 to 10 ) in connection with the Figures 1 to 7 (which do not show solutions according to the invention) explained in more detail. Show:

Fig. 1a to 1d

a first embodiment of a contact element with a configuration of a clamping element;

Fig. 2a to 2d

a second embodiment of a contact element with a configuration of a clamping element;

Fig. 3a to 3d

a third embodiment of a contact element with a configuration of a clamping element;

Fig. 4a to 4d

a fourth embodiment of a contact element with a configuration of a clamping element;

Fig. 5

an alternative embodiment of a contact element in a sectional view;

Fig. 6

the contact element according to Figure 5 in a perspective view;

Fig. 7

an embodiment of a clamping element;

Fig. 8

a first embodiment of a contact element according to the invention in a sectional view;

Fig. 9

the contact element according to Figure 8 in a perspective view;

Fig. 10

the clamping element according to Figure 8

The invention is explained below with reference to Figures 1 to 10 described in more detail, whereby the Figures 8 to 10 show an embodiment according to the invention and where the same reference numbers designate the same functional and / or structural features.

In the Figures 1a, 1b , 2a, 2b , 3a, 3b and 4a, 4b Embodiments of a contact element 1 are shown in each case and in the Figures 1c, 1d , 2c, 2d , 3c, 3d and 4c, 4d Clamping elements 5 of the aforementioned embodiments of the contact elements 1 are shown.

The electrical contact element 1 is formed from an elongated cylindrical contact pin 2, which is followed by a solid contacting section 4, as in the exemplary embodiments of the electrical contact elements 1 Figures 1 to 4 is shown. The contacting section 4 is designed as a connection block 9, the contacting section 4 each having an external clamping surface 40 which points in the direction of the clamping spring arm 6 of the clamping element 5. A resilient clamping element 5 encompassing the outer jacket 41 is attached to the outer jacket 41 of the contacting section 4 of the electrical contact element 1.

In the Figures 1c, 1d , 2c, 2d , 3c, 3d , 4c, 4d Four embodiments of clamping elements 5 are shown. The clamping elements 5 are designed in such a way that they have a clamping spring arm 6 for clamping contacting of a stranded conductor between the clamping surface 40 of the contacting section 4 of the electrical contact element 1 and the contacting area of the clamping spring arm 6. The clamping spring arm 6 is here when a stranded conductor is inserted into the Figs. 1a and 1b Spring-actuated from above from a stranded conductor insertion position into a conductor clamping position by actuating the clamping spring arm 6 of the clamping element 5 in the direction of its holding section 60, the stranded conductor is pressed against the clamping surface 40 in a spring-loaded contact manner by the clamping spring arm 6. In this way, contacting can be achieved without the use of tools.

As in the exemplary embodiments Figures 1 to 4 As can be seen, the resilient clamping element 5, in addition to the clamping spring arm 6, also has at least one holding arm 50, with a wrap-around section 51 formed at the end, so that the resilient clamping element 5 with these holding arms 50, namely with the wrap-around section 51, on the connection block 9 of the contact element 1 with positive locking can be attached. For this purpose, the wrap-around section 51 rests on the corresponding outer contour of the contacting section 4 on the connection block 9 of the contact element 1.

In the statements according to Figures 2c, 2d and 4c, 4d the clamping element 5 each has two holding arms 50 with a bent-over grip section 51 at the end, in which Figures 2 the grip is from the same side, while in the execution according to Figure 4 the two holding arms 50 grip the contacting section 4 of the contact element 1 with their gripping sections 51 coming from different, namely opposite sides.

In the Figures 5 to 7 a further alternative embodiment of an electrical contact element 1 is shown, with which in Figure 7 alternatively designed clamping element 5. Like the previously explained clamping elements 5, the clamping element 5 also has a holding arm 50, which is connected at an angle to the clamping spring arm 6 via a bending point 53. However, the wrapping portion 51 has a C-shaped shape in this exemplary embodiment. Furthermore, the electrical contact element 1 is designed such that the contacting section 4 forms a contact chamber 43 with an internal clamping surface 40 and the clamping spring arm 6 of the clamping element 5 passes through an opening 44 of the Contact chamber 43 protrudes into the contact chamber 43. In this exemplary embodiment, the stranded conductor would be actuated into the contact chamber 43 through the upper opening 44 of the contact chamber 43 and presses the clamping spring arm 6 out of its position Figure 5 shown stranded conductor insertion position into a conductor clamping position, in which the stranded conductor is contacted in a clamping manner between the clamping spring arm 6 and the opposite clamping surface 40 in the contact chamber 43.

In the Figures 8 to 10 an embodiment of an electrical contact element 1 according to the invention is shown, with which in Figure 10 Clamping element 5 designed alternatively according to the invention. The clamping element 5 has three holding arms 50, 54, which are connected at an angle to the clamping spring arm 6 via a bending point 53. However, two encompassing sections 51 in this exemplary embodiment have an L-shaped shape. Together with a barb 46 formed on the contacting section 4, the third, end-side holding arm 54 fastens the resilient clamping element 5 in a form-fitting manner Figure 9 in that the resilient clamping element 5 has a spring arm cutout 62 on the holding section 60 and engages by means of the barb 46. Furthermore, the electrical contact element 1 is designed such that the contacting section 4 forms a contact chamber 43 with an internal clamping surface 40 and the clamping spring arm 6 of the clamping element 5 protrudes into the contact chamber 43 through an opening 44 of the contact chamber 43. In this exemplary embodiment, the stranded conductor would be actuated into the contact chamber 43 through the opening 44 of the contact chamber 43 and presses the clamping spring arm 6 out of its position Figure 8 shown stranded conductor insertion position into a conductor clamping position, in which the stranded conductor is contacted in a clamping manner between the clamping spring arm 6 and the opposite clamping surface 40 in the contact chamber 43.

Reference symbol list

1

Contact element

2

Contact pin

4

Contacting section

4a

Section of the contacting section

5

Clamping element

6

Clamp spring arm

9

Connection block

40

Clamping surface

41

Outer jacket

43

Contact chamber

44.

opening

45

Insert opening

46

barb

50

Holding arm

51

wraparound section

52

arm end

53

bending point

54

end holding arm

60

holding section

61

Clamp arm section

62

Feather arm cutout

Claims (5)

1. Electrical contact element (1) for clamping connection of a braided conductor, consisting of a contact pin (2) and a contact-making section (4) which is connected to the contact pin and has an inner clamping area (40) and to the outer casing (41) of which a spring-action clamping element (5) is fastened in such a way that the spring-action clamping element, by way of its clamping spring arm (6), is intended for making clamping contact with a braided conductor end of the braided conductor between the clamping area (40) of the contact-making section (4) of a connection block (9) of the contact element (1) and the clamping spring arm (6), wherein the clamping spring arm (6) is operated with a spring action when the braided conductor is inserted from a braided conductor insertion position into a braided conductor clamping position, wherein the clamping spring arm (6) projects into the contact chamber (43) through an opening (44) in the contact chamber (43), characterized in that the spring-action clamping element (5) has at least one holding arm (50) with an end-side encompassing section (51) which, together with a barb (46) formed on the contact-making section (4), fastens the spring-action clamping element (5) with a form fit by way of the spring-action clamping element (5) having a spring arm cutout (62) in a holding section (60) of the clamping element (5) and which latches in by means of the barb (46), and in that a section (4a) of the contact-making section (4) is held in a clamping manner between the barb (46) and an end-side holding arm (54) formed by the clamping element (5).
2. Electrical contact element (1) according to Claim 1, characterized in that the clamping spring arm (6) has a non-spring-action holding section (60), and a spring-action clamping arm section (61) of the clamping spring arm (6) projects in the direction of the contact pin (2).
3. Electrical contact element (1) according to either of the preceding Claims 1 and 2, characterized in that the holding arm or the holding arms (50) is/are designed as substantially strip-like sheet-metal tongues which are bent over at the ends and which, by way of one of their holding arm ends (52), are connected to the clamping spring arm (6) in a manner angled away by means of a bending point (53).
4. Electrical contact element (1) according to one of the preceding claims, characterized in that two holding arms (50) encompass the contact-making section (4) of the contact element (1) by way of an encompassing section (51) from opposite sides.
5. Electrical contact element (1) according to one of the preceding claims, characterized in that the encompassing section (51) is formed in an L-shape.

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