DE102017126185B4 - Electrical contact element - Google Patents

Abstract

Electrical contact element (1) with a contact pin (2) and a resilient clamping element (5) fastened to the contact element (1) with a clamping spring arm (6) for clamping contacting of a stranded wire end between the clamping surface (40) of a contacting section (4) of a connection block (9 ) of a contact element (1) and the clamping spring arm (6), the clamping element (5) having at least one holding arm (50) with a gripping section (51) at the end, in order to hold the resilient clamping element (5) on the connection block (9) of the contact element ( 1) to be fastened with a form fit, with an outer contour of the contact pin (2) in the fastening area of the contacting section (4) being designed in the shape of a cylinder jacket, with the contacting section (4) connected to the contact pin (2) having an inner clamping surface (40) and on its Outer jacket (41) a resilient clamping element (5) is attached in such a way that this with its Klemmfederarm (6) for clamping contact s stranded conductor end is provided between the clamping surface (40) of the contacting section (4) and the clamping spring arm (6), the clamping spring arm (6) being spring-actuated when a stranded conductor is pushed in from a stranded conductor insertion position into a stranded conductor clamping position, the contacting section (4), the has a contact chamber (43) with an internal clamping surface (40) and the clamping spring arm (6) protrudes through an opening (44) of the contact chamber (43) into the contact chamber (43), characterized in that the gripping section (51), together with a barb (46) formed on the contacting section (4), fastens the resilient clamping element (5) with a positive fit, in that the resilient clamping element (5) has a spring arm cutout (62) on a holding section (60) of the clamping element (5) and by means of the Barb (46) engages and that a section (4a) of the contacting section (4) between the barb (46) and one of the clamping element (5) trained, end-side holding arm (54) is held clamped.

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 makes clamping contact with the preferably stripped end of a stranded conductor.

Such contact elements are provided in order 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 do not cause any unwanted disconnection 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 mating surface by means of axially or radially acting forces. where the angles of the cone surfaces are usually the same.

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

Furthermore, in the DE 197 18 004 C1 discloses a contact system consisting of a socket part and a plug part with resilient contact lamellae 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 in 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 spike-like contact part which can be screwed into the clamping sleeve, the contact part having a conical tip at an angle α to the vertical and a funnel-shaped connection end being seen on the clamping sleeve, into which the stranded conductor can be inserted into an inner connection chamber and wherein a conical surface is formed at an angle β to the vertical and the contact part can only be screwed into the connection chamber and the stranded conductor inserted therein so that between the tip of the contact part and the conical surface of the shoulder a minimum overlap remains.

This technical teaching discloses a contact element in which the end of the stranded conductor is, however, pressed against a side wall by the clamping sleeve and there is a risk that the ends of the stranded conductor will be damaged or even severed during pressing. In particular, when screwing the clamping sleeve, high forces are generated that can partially or completely shear off the stranded conductors, which, in the worst case, remains undetected.

Documented prior art in the present technical field reflecting the preamble of claim 1 is in the documents DE 10 2008 032 837 A1 , FR 2 936 659 A1 , DE 20 2004 000 418 U1 and DE 10 2011 000 979 B4 described.

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 at the outset and a stranded conductor in such a way that the aforementioned disadvantages are overcome and the stranded conductor, in addition to an optimal electrical contact connection, is held securely in particular under the influence of vibrations and a high pull-out security is guaranteed in the contact element.

This object is achieved by an electrical contact element having the features of claim 1.

A basic idea of the invention is to equip a contact element with a resilient clamping element, with 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 z. B. be attached to a contact with a screw terminal block suitable contour and a screwless, namely clamping contact of a stranded conductor are made with a contacting surface of the terminal block.

One aspect of the invention therefore relates to a resilient clamping element with a clamping spring arm for clamping contact with a stranded conductor between the clamping surface of a contacting section of a terminal block of a contact element and the clamping spring arm, the clamping element having at least one holding arm with a gripping section at the end in order to fasten the resilient clamping element to the terminal block of the 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 a resilient clamping element is fastened to its outer casing, which has a clamping spring arm, designed for clamping contact of a stranded conductor end between the clamping surface of the contacting section and the clamping spring arm, the clamping spring arm being spring-actuated when a stranded conductor is pushed in 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 encompasses the outside of the contacting section of the contact pin.

• - der wenigstens eine Haltearm ist am Klemmelement mit einem endseitigen umgebogenen Umgriffabschnitt ausgebildet;
• - die Form des Umgriffabschnitts stellt eine teilkreisbogenförmige Umbiegung des Klemmfederarms dar, vorzugsweise mit einem Teilkreissegment zwischen 90° und 180°, weiter vorzugsweise zwischen 100° und 135°;
• - 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 gleichen Seiten oder alternativ von unterschiedlichen, vorzugsweise gegenüberliegenden Seiten, wodurch eine besonders gute Umklammerung erzielt werden kann;
• - der Umgriffabschnitt ist in einer L- oder C-Form ausgebildet, so dass dieser beispielsweise auch kastenförmige Kontaktelemente umgreifen kann;

Further advantageous configurations and features are as follows, which can be used both individually and in combination:

• - The at least one holding arm is formed on the clamping element with an end-side bent gripping section;
• the shape of the gripping section represents a bending of the clamping spring arm in the shape of a partial arc of a circle, preferably with a partial circle segment between 90° and 180°, more preferably between 100° and 135°;
• - The clamping spring arm has a non-resilient holding section and a resilient clamping arm section of the clamping spring arm protrudes in the direction of the contact pin;
• The one or more retaining arms are designed as essentially strip-shaped and end-bent sheet metal tongues, which are connected to the clamping spring arm at an angle with one of the retaining arm ends via a bending point;
• - Two retaining arms surround the contacting portion of the contact pin with a gripping portion from the same sides or alternatively from different, preferably opposite sides, whereby a particularly good grip can be achieved;
• - The gripping section is formed in an L or C shape, so that it can also grip box-shaped contact elements, for example;

• 1a bis 1d eine erste Ausführungsform eines Kontaktelementes mit einer Ausgestaltung eines Klemmelements;
• 2a bis 2d eine zweite Ausführungsform eines Kontaktelementes mit einer Ausgestaltung eines Klemmelements;
• 3a bis 3d eine dritte Ausführungsform eines Kontaktelementes mit einer Ausgestaltung eines Klemmelements;
• 4a bis 4d eine vierte Ausführungsform eines Kontaktelementes mit einer Ausgestaltung eines Klemmelements;
• 5 eine alternative Ausführungsform eines Kontaktelements in einer Schnittansicht;
• 6 das Kontaktelement gemäß 5 in einer perspektivischen Ansicht;
• 7 eine Ausführungsform eines Klemmelements;
• 8 eine Ausführungsform eines erfindungsgemäßen Kontaktelements in einer Schnittansicht;
• 9 das Kontaktelement gemäß 8 in einer perspektivischen Ansicht;
• 10 eine Ausführungsform eines erfindungsgemäßen Klemmelements.

The invention is explained in more detail below using a preferred exemplary embodiment in conjunction with the figures. show:

• 1a until 1d a first embodiment of a contact element with an embodiment of a clamping element;
• 2a until 2d a second embodiment of a contact element with an embodiment of a clamping element;
• 3a until 3d a third embodiment of a contact element with an embodiment of a clamping element;
• 4a until 4d a fourth embodiment of a contact element with an embodiment of a clamping element;
• 5 an alternative embodiment of a contact element in a sectional view;
• 6 the contact element according to 5 in a perspective view;
• 7 an embodiment of a clamping element;
• 8th an embodiment of a contact element according to the invention in a sectional view;
• 9 the contact element according to 8th in a perspective view;
• 10 an embodiment of a clamping element according to the invention.

The invention is based on the 1 until 10 described in more detail, with the same reference numbers denoting the same functional and/or structural features. There they are 1 until 7 no embodiments according to the invention, but merely serve to explain the invention based on the prior art.

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

The electrical contact element 1 is formed from an elongate, cylindrical contact pin 2, to which a solid contacting section 4 is connected, as in the exemplary embodiments of the electrical contact elements 1 of FIG 1 until 4 is shown. The contacting section 4 is in the form of a connection block 9 , the contacting section 4 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 enclosing the outer casing 41 is fastened to the outer casing 41 of the contacting section 4 of the electrical contact element 1 .

In the 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 contact with 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 hereby pushed in when a stranded conductor is inserted in the 1a and 1b resiliently actuated from above from a stranded conductor insertion position into a conductor clamping position, in that the clamping spring arm 6 of the clamping element 5 is actuated in the direction of its holding section 60, the stranded conductor is pressed against the clamping surface 40 under spring force by the clamping spring arm 6 making contact. In this way one can realize a tool-free contacting.

As in the embodiments of 1 until 4 As can be seen, in addition to the clamping spring arm 6, the resilient clamping element 5 also has at least one retaining arm 50 with a gripping section 51 formed at the end, so that the resilient clamping element 5 with these retaining arms 50, specifically with the gripping section 51, on the terminal block 9 of the contact element 1 with a form fit can be attached. For this purpose, the gripping section 51 is in contact with the corresponding outer contour of the contacting section 4 on the connection block 9 of the contact element 1 .

In the statements according to 2c , 2d and 4c , 4d has the clamping element 5 in each case two holding arms 50 with a bent end grip portion 51, wherein in the 2 the wraparound is done from the same side while in the execution according to 4 the two holding arms 50 enclose the contacting section 4 of the contact element 1 with their gripping sections 51 coming from different, specifically opposite, sides.

In the 5 until 7 a further alternative embodiment of an electrical contact element 1 is shown, with which in 7 alternatively configured clamping element 5. Like the clamping elements 5 explained above, 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, in this embodiment, the wraparound portion 51 has a C-shape. 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 through an opening 44 in the contact chamber 43 into the contact chamber 43 . In this exemplary embodiment, the stranded conductor would be actuated through the upper opening 44 of the contact chamber 43 into the contact chamber 43 and pushes the clamping spring arm 6 out of its in 5 shown stranded conductor insertion position in a conductor clamping position, in which the stranded conductor between the clamping spring arm 6 and the opposite clamping surface 40 in the contact chamber 43 is contacted in a clamping manner.

In the 8th until 10 an embodiment of an electrical contact element 1 according to the invention is shown, with which in 10 according to the invention alternatively designed clamping element 5. 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, in this embodiment, two wraparound portions 51 have an L-shape. Together with a barb 46 formed on the contacting section 4, the third holding arm 54 at the end fastens the resilient clamping element 5 in a form-fitting manner according to FIG 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 through an opening 44 in the contact chamber 43 into the contact chamber 43 . In this exemplary embodiment, the stranded conductor would be actuated through the opening 44 of the contact chamber 43 into the contact chamber 43 and presses the clamping spring arm 6 out of its in 8th shown stranded conductor insertion position in a conductor clamping position, in which the stranded conductor between the clamping spring arm 6 and the opposite clamping surface 40 in the contact chamber 43 is contacted in a clamping manner.

It is further preferred if a section 4a of the contacting section 4 between the barb 46 and one of the clamping element 5 trained, end-side holding arm 54 is held clamped.

In the 1 until 4 the electrical contact elements 1 in the fastening area of the contacting section 4 have a cylinder jacket shape, so that the wraparound sections 51 bear against the contacting section 4 with a positive fit.

In a similar way, the clamping element 5 according to 7 on the electrical contact element 1 according to 6 fastened in which the gripping section 51 engages around the outer contour of the contacting section 4 which is essentially box-shaped here.

Reference List

1

contact element

2

contact pin

4

contacting section

4a

Section of the contacting section

5

clamping element

6

clamping spring arm

9

terminal block

40

clamping surface

41

outer jacket

43

contact chamber

44

opening

45

insertion opening

46

barb

50

holding arm

51

wraparound section

52

holding arm end

53

bending point

54

terminal arm

60

holding section

61

clamp arm section

62

spring armhole

Claims (8)

Electrical contact element (1) with a contact pin (2) and a resilient clamping element (5) fastened to the contact element (1) with a clamping spring arm (6) for clamping contacting of a stranded conductor end between the clamping surface (40) of a contacting section (4) of a connection block (9 ) of a contact element (1) and the clamping spring arm (6), the clamping element (5) having at least one holding arm (50) with a gripping section (51) at the end, in order to hold the resilient clamping element (5) on the connection block (9) of the contact element ( 1) to be fastened with a positive fit, with an outer contour of the contact pin (2) in the fastening area of the contacting section (4) being designed in the shape of a cylinder jacket, with the contacting section (4) connected to the contact pin (2) having an inner clamping surface (40) and on its Outer jacket (41) a resilient clamping element (5) is attached such that this with its Klemmfederarm (6) for clamping contact s stranded conductor end is provided between the clamping surface (40) of the contacting section (4) and the clamping spring arm (6), the clamping spring arm (6) being spring-actuated when a stranded conductor is pushed in from a stranded conductor insertion position into a stranded conductor clamping position, the contacting section (4), the has a contact chamber (43) with an internal clamping surface (40) and the clamping spring arm (6) protrudes through an opening (44) of the contact chamber (43) into the contact chamber (43), characterized in that the gripping section (51), together with a barb (46) formed on the contacting section (4), fastens the resilient clamping element (5) with a positive fit, in that the resilient clamping element (5) has a spring arm cutout (62) on a holding section (60) of the clamping element (5) and by means of the Barb (46) engages and that a section (4a) of the contacting section (4) between the barb (46) and a clamping element (5 ) trained, end-side holding arm (54) is held clamped. Electrical contact element (1) according to claim 1 , characterized in that the clamping element (5) is fastened to the contact element (1) by means of at least one holding arm (50) which at least partially encompasses the outside of the contacting section (4) of the contact pin (2). Electrical contact element (1) according to claim 1 or 2 , characterized in that the at least one holding arm (50) is formed on the clamping element (5) with an end-side bent gripping section (51). Electrical contact element (1) according to claim 3 , characterized in that the shape of the gripping section (51) represents a partial circular arc-shaped bending of the clamping spring arm (6), preferably with a partial circle segment between 90° and 180°, more preferably between 100° and 135°. Electrical contact element (1) according to any one of the preceding claims, characterized characterized in that the clamping spring arm (6) has a non-resilient holding section (60), and a resilient clamping arm section (61) of the clamping spring arm (6) protrudes in the direction of the contact pin (2). Electrical contact element (1) according to any one of the preceding claims 2 until 5 , characterized in that the one or more holding arms (50) are designed as essentially strip-shaped sheet metal tongues which are bent over at the end and which are connected to the clamping spring arm (6) at an angle with one of the holding arm ends (52) via a bending point (53). Electrical contact element (1) according to one of the preceding claims, characterized in that two holding arms (50) encompass the contacting section (4) of the contact element (1) with a gripping section (51) coming from the same sides or from different, preferably opposite sides. Electrical contact element (1) according to any one of the preceding claims 2 until 3 or 5 until 7 , characterized in that the wraparound portion (51) is formed in an L or C shape.

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