WO2018087211A1 - Contact element comprising a clamping terminal for a stranded conductor - Google Patents

Abstract

The invention relates to an electrical contact element having a contact pin and a resilient clamping element which is fastened to the contact element and has a clamping spring arm for making clamping contact with a stranded conductor end between the clamping face of a contacting section of a terminal block of a contact element and the clamping spring arm. The clamping element has at least one retaining arm having an end gripping section to fasten the resilient clamping element interlockingly to the terminal block of the contact element. The electrical contact element is characterised in that the outer contour of the contact pin is cylindrical with a round or polygonal cross-section in the fastening region of the contacting section.

Description

 description

Contact element with a clamping

 Connection for stranded wire

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

The invention therefore particularly relates to an electrical contact element with a connection for stranded conductor, wherein the contact element is a specifically shaped and actu bare

Contact spring which can be transferred into a position clamping the stranded conductor and in the clamping position, the preferably stripped end of a stranded conductor contacted by clamping.

Such contact elements are provided to be assembled in particular in the field

Connections with stranded cables both mechanically fixed and electrically reliable to connect to the contact element, and it must also be ensured that high tensile forces, mechanical influences and vibrations must not cause unwanted separation of the connection.

For example, in the prior art it is known that stranded conductors are connected to contact elements with crimped connections or, alternatively, stranded conductors can be connected to contact elements, in which a conical contact part in a contact element is connectable

Stranded conductor by means of axially or radially acting forces on a corresponding shaped

Press counter surface, the angles of the conical surfaces are usually the same. In the prior art, for example, one for connecting stranded conductor

described contact element disclosed in DE 89 14 460 U1.

Furthermore, DE 197 18 004 C1 discloses a contact system consisting of a socket part and a plug part with spring-elastic contact blades for transmitting high currents.

In FR 618 171 A devices are disclosed which are suitable for clamping - electrical conductors for electrical equipment, in which in particular sheathed electrical conductors are clamped in insulating devices for mounting. Furthermore, 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 which is screwed in the clamping sleeve, the contact part having a conical tip at an angle α to the perpendicular and on the clamping sleeve a funnel-shaped connection end is considered, in which the stranded conductor in an inner

Further, a conical surface is formed with an angle ß to the vertical and the contact part but only as far into the connection chamber and the inserted therein stranded conductor can be screwed that a minimum overlap remains between the tip of the contact part and the conical surface of the shoulder.

This technical teaching discloses a contact element in which the stranded conductor end is, however, pressed by the clamping sleeve against a side wall and there is a risk that the ends of the stranded conductors are damaged during pressing or even severed.

In particular, when screwing the clamping sleeve arise high forces that can shear off the stranded conductors partially or completely, but this remains undetected in the worst case.

Object of the present invention

The invention is therefore based on the object, a safe and easy to produce

Form connection between a contact element of the type mentioned and a stranded conductor to the effect that said disadvantages are overcome and the stranded conductor in addition to an optimal electrical contact connection, especially safe at

Vibration influences is maintained and a high pull-out safety is ensured in the contact element.

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

A basic idea of the invention is to provide a contact element with a resilient clamping element, wherein the clamping element is a contact element

encompassing mounting arm and a Klemmfederarm for contacting a

Litz conductor has. In this way, the clamping element z. B. at a contact with a

Screw terminal block suitable contour are fixed and a screwless, namely clamping contact of a stranded conductor can be made with a contact surface of the terminal block.

An aspect of the invention therefore relates to a resilient clamping element with a clamping spring arm for the clamping contacting of a stranded conductor end between the clamping surface of a Kontaktierungsabschnitts a terminal block of a contact element and the

Clamping spring arm, wherein the clamping element has at least one support arm with an end-side wrap-around portion to secure 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 an associated contacting section, which has an outer Kiemmfläche and on the outer shell, a resilient clamping element is attached, which with a Klemmfederarm, designed for clamping contacting a

Litzenleiterendes between the clamping surface of the Kontaktierungsabschnitts and the

Klemmfederarm, is formed, wherein the Klemmfederarm when inserting a

 Stranded conductor is actuated by a Litzenleitereinführposition in a Litzenleiterklemmposition springs.

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 contacting section of the contact pin.

Further advantageous embodiments 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 Umgriffabschnitt; the shape of the Umgriffabschnitts represents a partial arc-shaped bend of the

Klemmfederarms is, preferably with a pitch circle segment between 90 ° and 180 °, more preferably between 100 ° and 135 °; the Au ßenkontur the contact pin in the attachment region of the contacting portion is formed zyiindermantelförmig or teilzylindermantelelförmig; the Klemmfederarm has a non-resilient retaining portion and a resilient clamping arm portion of the Klemmfederarms protrudes in the direction of the contact pin; the one or more retaining arms are substantially strip-shaped and end-side

 bent sheet metal tongues formed, which with its one holding arm end

 angled are connected via a bending point with the clamping spring arm; two retaining arms engage around the contacting pin of the contact pin with a wrap-around portion of like sides or alternatively of different, preferably opposite sides, whereby a particularly good grip can be achieved; the Umgriffabschnitt is formed in an L or C-shape, so that this can embrace, for example, box-shaped contact elements; - It can be provided with an inner clamping surface, a contact chamber (with a receiving space for the stranded conductor), in which case the Klemmfederarm protrudes through an opening of the contact chamber into the contact chamber.

The invention will be described below with reference to a preferred embodiment

Connection with the figures explained in more detail. Showing:

1 a to 1 d show a first embodiment of a contact element according to the invention with an embodiment of a clamping element;

2a to 2d, a second embodiment of an inventive

 Contact element with a configuration of a clamping element;

3a to 3d a third embodiment of a contact element according to the invention with an embodiment of a clamping element; 4a to 4d, a fourth embodiment of a contact element according to the invention with an embodiment of a clamping element; 5 shows an alternative embodiment of a contact element according to the invention in a sectional view; FIG. 6 shows the contact element according to FIG. 5 in a perspective view; FIG.

7 shows an embodiment of a clamping element according to the invention;

Fig. 8 shows an alternative embodiment of an inventive

 Contact element in a Scj-section view;

FIG. 9 the contact element according to FIG. 8 in a perspective view; FIG.

10 shows an embodiment of a clamping element according to the invention.

The invention will be described in more detail below with reference to FIGS. 1 to 10, wherein the same reference numerals denote the same functional and / or structural features.

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

Contact elements 1 shown.

The electrical contact element 1 is formed from an elongated cylindrical contact pin 2, to which a solid contacting section 4 connects, as shown in the

Embodiments of the electrical contact elements 1 of Figures 1 to 4 is shown. The contacting portion 4 is formed as a terminal block 9, wherein the

Contacting section 4 each having an outer clamping surface 40 which points in the direction of the Klemmfederarms 6 of the clamping element 5. On the outer jacket 41 of the Kontaktierungsabschnitts 4 of the electrical contact element 1, a the outer jacket 41 encompassing resilient clamping element 5 is fixed.

FIGS. 1c, 1d, 2c, 2d, 3c, 3d, 4c, 4d show four embodiments of clamping elements 5. The clamping elements 5 are designed such that they have a Klemmfederarm 6 and indeed for clamping contacting a stranded conductor between the

Clamping surface 40 of the Kontaktierungsabschnitts 4 of the electrical contact element 1 and the Contacting of the Klemmfederarms 6. The Klemmfederarm 6 is in this case

Insertion of a stranded conductor in FIGS. 1 a and 1 b from above from a

Litzenleitreinführposition in a ladder clamping position resiliently actuated by the

Klemmfederarm 6 of the clamping element 5 is actuated in the direction of the holding portion 60, the stranded conductor against the clamping surface 40 is spring-loaded by the

Clamping spring arm 6 pressed pressed. In this way, you can realize a werkezuglosen contact. As can be seen in the embodiments of Figures 1 to 4, the resilient

 Clamping element 5 next to the Klemmfederarm 6 further comprises at least one support arm 50, with an end formed Umgriffabschnitt 51, so that the resilient clamping element 5 can be fixed with these retaining arms 50 and that with the Umgriffabschnitt 51 to the terminal block 9 of the contact element 1 with positive engagement. For this purpose, the wraparound section 51 abuts the correspondingly corresponding outer contour of the contacting section 4 on the connection block 9 of the contact element 1.

In the embodiments according to FIGS. 2c, 2d and 4c, 4d, the clamping element 5 has in each case two retaining arms 50 with a wrap-around section 51 bent over at the ends, wherein in FIGS. 2 the wrapping takes place from the same side, while in the embodiment according to FIG two holding arms 50 the contacting portion 4 of the contact element 1 with their

Umgriffabschnitten 51 coming from different and opposite sides embrace. FIGS. 5 to 7 show a further alternative embodiment of an electrical contact element 1 according to the invention, with clamping element 5 formed alternatively in accordance with the invention. The clamping element 5, like the above-described clamping elements 5, likewise has a holding arm 50, which is angled over a bending point 53 is connected to the Klemmfederarm 6. However, the wrap-around portion 51 in this embodiment has a C-shape. Further, the electrical contact element 1 is formed so that the contacting section 4 forms a contact chamber 43 with an inner clamping surface 40 and the Klemmfederarm 6 of the clamping element 5 projects through an opening 44 of the contact chamber 43 into the contact chamber 43. In this

In the embodiment, the stranded conductor would be actuated through the upper opening 44 of the contact chamber 43 into the contact chamber 43 and press the Klemmfederarm 6 from its shown in Figure 5 Litzenleitereinführposition in a conductor clamping position, wherein the stranded conductor between the Klemmfederarm 6 and the opposite clamping surface 40 in the

Contact chamber 43 is contacted by clamping. FIGS. 8 to 10 show a further alternative embodiment of an electrical contact element 1 according to the invention, with clamping element 5 alternatively designed according to the invention. The clamping element 5 has three holding arms 50, 54 which are angled over a bending point 53 with the clamping spring arm 6 are connected. However, two Umgriffabschnitte 51 in this embodiment, an L-shaped form. The third, end-side holding arm 54, together with a hook 46 formed on the contacting section 4, affixes the resilient clamping element 5 in a form-fitting manner according to FIG. 9 in that the resilient clamping element 5 forms a spring arm cutout 62 on the

Holding portion 60 and engages by means of the hook 46. Further, the electrical contact element 1 is formed so that the contacting portion 4 forms a contact chamber 43 with an inner clamping surface 40 and the Klemmfederarm 6 of the

 Clamping element 5 protrudes through an opening 44 of the contact chamber 43 into the contact chamber 43. In this embodiment, the stranded conductor would be actuated through the opening 44 of the contact chamber 43 into the contact chamber 43 and pushes the Klemmfederarm 6 from its Litzenleitereinführposition shown in Figure 8 in a conductor clamping position in which the stranded conductor between the Klemmfederarm 6 and the opposite clamping surface 40 in the Contact chamber 43 is contacted by clamping.

It is further preferred if a section 4a of the contacting section 4 is clamped between the re-hook 46 and an end-side holding arm 54 formed by the clamping element 5. In the figures 1 to 4, the electrical contact elements 1 in the mounting region of the Kontaktierungsabschnitts 4 a cylinder jacket-shaped shape, so that the Umgriffabschnitte 51 rest with positive engagement on the contacting section 4.

In a similar manner, the clamping element 5 is attached according to Figure 7 to the electrical contact element 1 according to Figure 6, in which the Umgriffabschnitt 51 engages around the outer contour of the here substantially box-shaped contacting section 4. However, the invention is not limited in its execution to the above-mentioned preferred embodiment. Rather, a number of variants and embodiments are conceivable, which makes use of the illustrated solution and the illustrated method even with fundamentally different type of execution.

LIST OF REFERENCE NUMBERS

1 contact element

 Contact pin Contact termination

 a section of Kontaktierungsabschnitts KSemmelement

 Klemmfederarm

 y

9 terminal block

40 clamping surface

 41 outer jacket

43 contact chamber

 44 opening

 45 insertion opening

 46 re-hook

50 holding arm

 51 Umgriffabschnitt

 52 holding arms

 53 Bend

54 end-side holding arm

60 holding section

 61 clamping arm section

 62 spring arm cutout

Claims

 claims 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 Klemmfederarm (6), wherein the clamping element (5) has at least one retaining arm (50) with an end-side Umgriff portion (51) to the resilient Clamping element (5) to the terminal block (9) of the contact element (1) with positive locking to secure, wherein the electrical contact element (1) is characterized in that the outer contour of the contact pin (2) in the mounting region of Contacting portion (4) is cylindrical shell-shaped with a round or square cross-section. Electrical contact element (1) for the clamping connection of a stranded conductor, consisting of a contact pin (2) and a connected thereto Contacting portion (4) having an outer clamping surface (40) and on the outer jacket (41) a resilient clamping element (5) is fixed according to claim 1, such that this with its Klemmfederarm (6) for clamping contacting a stranded conductor end between the Clamping surface (40) of the Kontaktierungsabschnitts (4) and the Klemmfederarm (6) is provided, wherein the Klemmfederarm (6) during the Inserting a stranded conductor from a Litzenleitereinführposition in one Litzenleiterklemmposition springs is actuated. Electrical contact element (1) for the clamping connection of a stranded conductor, consisting of a contact pin (2) and a connected thereto Contacting section (4) having an inner clamping surface (40) and on the outer shell (41) a resilient clamping element (5) according to claim 1 is fixed, such that this with its Klemmfederarm (6) for clamping contacting a stranded conductor between the clamping surface (40) of the Kontaktierungsabschnitts (4) and the Klemmfederarm (6) is provided, wherein the Klemmfederarm (6) during the Inserting a stranded conductor from a Litzenleitereinführposition in one Litzenleiterklemmposition springs is actuated. Electrical contact element (1) according to claim 2, characterized in that the clamping element (5) by means of at least one contacting portion (4) of the Contact pin (2) at least partially outside embracing support arm (50) on  Contact element (1) is attached. Electrical contact element (1) according to claim 2, 3 or 4, characterized in that the at least one, holding arm (50) on lemmelement (5) with an end-side bent-over Umgriff portion (51) is formed. Electrical contact element (1) according to claim 5, characterized in that the shape of the Umgriffabschnitts (51) a partial arc-shaped bend of the  Klemmfederarms (6), preferably with a pitch circle segment between 90 ° and 180 °, more preferably between 100 ° and 135 °. Electrical contact element (1) according to one of the preceding claims, characterized in that the Klemmfederarm (6) has a non-resilient retaining portion (60), and a resilient Klemmarmabschnitt (61) of the Klemmfederarms (6) in the direction of the contact pin (2) protrudes. Electrical contact element (1) according to one of the preceding claims 4 to 7, characterized in that the one or more holding arms (50) are designed as substantially strip-shaped and bent-over sheet metal tongues, which with their one holding arm end (52) angled over a bending point (53 ) with the  Clamping spring arm (6) are connected. Electrical contact element (1) according to one of the preceding claims, characterized in that two retaining arms (50) embrace the contacting section (4) of the contact element (1) with a wrap-around section (51) coming from the same side or from different, preferably opposite sides. 10. Electrical contact element (1) according to one of the preceding claims 2 to 5 or 7 to 9, characterized in that the Umgriffabschnitt (51) in one L- or C-shape is formed. 1 1. An electrical contact element (1) according to claim 3, characterized in that the contacting portion (4) having a contact chamber (43) with an inner clamping surface (40) and the Klemmfederarm (6) through an opening (44) of Contact chamber (43) protrudes into the contact chamber (43). 12. An electrical contact element (1) according to claim 1 1, characterized in that the resilient clamping element (5) has a wraparound portion (51), which, together with a contacting section (4) formed hooks (46), the resilient clamping element ( 5) secured with positive engagement by the resilient clamping element (5) has a spring arm cutout (62) on a holding portion (60) of the clamping element (5) and which engages by means of the Wiederhakens (46). 13. Electrical ContactsSement (1) according to claim 12, characterized in that a portion (4a) of the contacting portion (4) between the re-hook (46) and one of the clamping element (5) formed, end-side holding arm (54) is clamped.