WO2024002413A1 - Contact spring assembly for electrical contact devices - Google Patents

Contact spring assembly for electrical contact devices Download PDF

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Publication number
WO2024002413A1
WO2024002413A1 PCT/DE2023/100450 DE2023100450W WO2024002413A1 WO 2024002413 A1 WO2024002413 A1 WO 2024002413A1 DE 2023100450 W DE2023100450 W DE 2023100450W WO 2024002413 A1 WO2024002413 A1 WO 2024002413A1
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WO
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Prior art keywords
spring assembly
contact
contact spring
leaf springs
another
Prior art date
Application number
PCT/DE2023/100450
Other languages
German (de)
French (fr)
Inventor
Daniel Wesseler
Original Assignee
Harting Electric Stiftung & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Harting Electric Stiftung & Co. Kg filed Critical Harting Electric Stiftung & Co. Kg
Publication of WO2024002413A1 publication Critical patent/WO2024002413A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/48—Clamped connections, spring connections utilising a spring, clip, or other resilient member
    • H01R4/4809—Clamped connections, spring connections utilising a spring, clip, or other resilient member using a leaf spring to bias the conductor toward the busbar
    • H01R4/48185—Clamped connections, spring connections utilising a spring, clip, or other resilient member using a leaf spring to bias the conductor toward the busbar adapted for axial insertion of a wire end
    • H01R4/4819—Clamped connections, spring connections utilising a spring, clip, or other resilient member using a leaf spring to bias the conductor toward the busbar adapted for axial insertion of a wire end the spring shape allowing insertion of the conductor end when the spring is unbiased
    • H01R4/4823—Multiblade spring

Definitions

  • the invention relates to a contact spring assembly for electrical contact devices, with at least one leaf spring, which has two legs connected to one another by a curved section, the curved section having a bending angle of more than 270°.
  • This contact device is used for self-locking contacting of a wire of an electrical conductor, and has a support wall made of a conductive material and a contact spring, which is formed by a one-piece leaf spring made of a suitably bent spring steel sheet.
  • the contact spring has a base leg which is held stationary in relation to the supporting wall and a clamping leg which, together with the supporting wall, forms a plug receptacle for the wire of the conductor which tapers in the insertion direction.
  • the support wall may be part of a conductive structure, such as a busbar or a connector contact.
  • a stripped end of the core e.g. a copper core
  • the end of the wire slides onto the flank of the clamping leg and deflects this clamping leg. Due to the elastic restoring force of the spring, a gripping edge of the contact spring formed at the free end of the clamping leg claws into the circumferential surface of the copper wire.
  • a release member is provided, which is guided so as to be displaceable in the insertion direction with respect to the support wall and has an actuating arm which engages on a flank of the clamping leg facing the plug-in receptacle.
  • the release element In order to release the contact, the release element is moved in the insertion direction so that its actuating arm runs onto the flank of the clamping leg and bends it back. This releases the wire of the conductor so that the conductor can be withdrawn from the plug-in receptacle.
  • German Patent and Trademark Office has searched the following prior art in the priority application for the present application: DE 198 10 310 C1, DE 10 2005 050 399 B3, DE 100 07 090 A1,
  • the object of the invention is to enable the construction of a contact device that requires less installation space for a given holding force.
  • contact spring assembly which is formed by several leaf springs stacked one above the other.
  • Designing the contact spring as a multi-layer assembly has the advantage that the required clamping force can be achieved with a smaller material thickness of the individual leaf springs. This allows the bending radius to be reduced in the curved section without causing over-stretching of the material. Due to the smaller bending radius, the distance between the two legs of the contact spring assembly is reduced and thus the installation space required to accommodate this assembly in a contact device.
  • the individual leaf springs of the assembly can be connected to one another at points or over the entire surface by joining, for example by gluing, soldering, welding, riveting or clinching.
  • the leaf springs can remain unconnected and simply held in position lying loosely on top of each other.
  • the individual leaf springs it is also possible for the individual leaf springs to be interconnected so that once they have been inserted into one another, they remain connected to one another due to their own elasticity.
  • the clamping force can be adapted to the respective requirements without having to change the geometry and the overall thickness of the leaf spring assembly.
  • the clamping force can also be influenced by the type of connection between the leaf springs. If the leaf springs are unconnected, the leaf springs may shift against each other as the assembly is bent. In this case there is a relatively low clamping force. However, if the leaf springs are rigidly connected to one another over the entire surface or at least at their opposite ends, a relative displacement of the individual leaf springs is not possible, so that the spring package offers greater resistance to bending and can therefore generate a higher clamping force.
  • Fig. 2 is an exploded view of the contact spring assembly
  • Fig. 3 shows an enlarged partial longitudinal section through a contact spring assembly according to another exemplary embodiment.
  • Fig. 1 shows an upper end of a contact device 10, which forms a self-locking plug contact for a stripped end of a wire 12 of an electrical conductor 14.
  • the contact device has a contact spring assembly 16 and an electrically conductive structure 18, which can be inserted into an insulating housing, not shown, and forms a support wall 20 for the wire 12.
  • the conductive structure 18 can z. B. form a socket contact.
  • the support wall 20 is one of four walls of a channel 22 which accommodates most of the contact spring assembly 16.
  • a wall 24 of this channel opposite the supporting wall 20 forms a holder for a first leg 26 of the contact spring assembly.
  • This leg 26, which is referred to below as the base leg is held on the wall 24 with rivets 28, for example.
  • One end of the base leg projects upwards (against the insertion direction of the conductor 14) out of the channel 22 and is connected there to a second leg 32 of the contact spring assembly 16 by a curved section 30, which has a bending angle of more than 270 °.
  • the supporting wall 20, together with the second leg 32, which is referred to below as the clamping leg, forms a plug-in receptacle 34 for the wire 12.
  • the insertion direction is indicated by an arrow in FIG.
  • the end of the wire 12 is not yet inserted into the plug receptacle 24.
  • the clamping leg is held by the curved section 30 in such a way that it runs obliquely to the insertion direction in the direction of the depth of the plug-in receptacle 34.
  • a gripping edge 36 formed at the free end of the clamping leg 32 lies against the supporting wall 20. If the wire 12 is advanced further in the insertion direction, the clamping leg is bent downwards and the wire 12 enters the space between the gripping edge 36 and the supporting wall 20 and is held in position by clamping. If an upward pull is then exerted on the wire, the wire is held in position in a self-locking manner by the gripping edge 36.
  • the contact spring assembly 16 is not formed by a single leaf spring, but by a layered structure made up of three leaf springs 38, 40, 42 in the example shown, which rest against one another over the entire surface.
  • Each of the three leaf springs 38, 40, 42 consists of thin spring steel sheet, which can optionally have a galvanically applied corrosion protection coating on both sides.
  • all three leaf springs 38, 40, 42 have the same thickness.
  • the thicknesses of the leaf springs are different and, for example, increase or decrease from the inside to the outside (based on the curvature of the curved section 30).
  • the thickness of an individual leaf spring 38, 40, 42 is significantly smaller than the thickness of a conventional contact spring 16 ', which is formed only by a single-layer leaf spring and is shown in dash-dotted lines in FIG. 1 for comparison purposes.
  • the leaf springs 38, 40, 42 are shown separately from one another in an exploded view.
  • the leaf springs 38, 40, 42 are first bent individually and only then inserted into one another so that they rest against one another over the entire surface, as in FIG. 1.
  • the low material thickness of the Individual leaf springs 38, 40, 42 allow a significantly smaller bending radius than was possible with the conventional contact spring 16 '. This significantly reduces the installation space required for the contact device 10 as a whole.
  • the position of a wall 24' to which the conventional contact spring 16' would be fastened with its base leg is also indicated by dash-dotted lines in FIG.
  • the leaf springs 38, 40, 42 are held together by the rivets 28 in the assembled state.
  • the leaf springs can also be connected to one another by gluing, soldering or welding before assembly.
  • the base leg 26 is pivoted slightly outwards (to the left in Fig. 1) in the part lying above the wall 24.
  • the clamping leg 32 has a hump 44, which serves as a support for a release element, not shown here. If the steeper flank of the hump 44 is steeper than the outwardly pivoted section of the base leg 26, the inner leaf spring 42 can only be detached from the middle leaf spring 40 if the clamping leg of the leaf spring 42 is deflected elastically, so that the hump 44 This leaf spring can emerge from the corresponding hump of the leaf spring 40. In this way, the three leaf springs are, as it were, interconnected in the state shown in FIG. 1, so that they can be handled as a single unit even without the rivets 28.
  • Another way to fix the leaf springs stacked on top of each other is to connect these leaf springs to one another at certain points, for example by spot welding.
  • Fig. 3 illustrates a further possibility in which the leaf springs 38, 40, 42 are connected to one another at a tacking point 46 by clinching.

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  • Coupling Device And Connection With Printed Circuit (AREA)

Abstract

The invention relates to a contact spring assembly for electrical contact devices (10), having at least one leaf spring (38, 40, 42) which has two legs (26, 32) that are connected to one another by a curved portion (30), wherein the curved portion (30) has a bend angle of more than 270°, characterized in that the contact spring assembly (16) is formed by a plurality of leaf springs (38, 40, 42) layered one on top of the other.

Description

Titel: Kontaktfederbaugruppe für elektrische Kontaktvorrichtungen Title: Contact spring assembly for electrical contact devices
Die Erfindung betrifft eine Kontaktfederbaugruppe für elektrische Kontaktvorrichtungen, mit mindestens einer Blattfeder, die zwei durch einen gebogenen Abschnitt miteinander verbundene Schenkel aufweist, wobei der gebogene Abschnitt einen Biegewinkel von mehr als 270° aufweist. The invention relates to a contact spring assembly for electrical contact devices, with at least one leaf spring, which has two legs connected to one another by a curved section, the curved section having a bending angle of more than 270°.
Ein Beispiel einer Kontaktvorrichtung, bei der die Erfindung anwendbar ist, wird in DE 202006 009 460 U1 beschrieben. Diese Kontaktvorrichtung dient zur selbstverriegelnden Kontaktierung einer Ader eines elektrischen Leiters, und weist eine aus einem leitfähigen Material gebildete Stützwand und eine Kontaktfeder auf, die durch eine einteilige Blattfeder aus einem geeignet gebogenem Federstahlblech gebildet wird. Die Kontaktfeder hat einen in Bezug auf die Stützwand ortsfest gehaltenen Basisschenkel und einen Klemmschenkel, der zusammen mit der Stützwand eine sich in Einsteckrichtung verjüngende Steckaufnahme für die Ader des Leiters bildet. An example of a contact device to which the invention is applicable is described in DE 202006 009 460 U1. This contact device is used for self-locking contacting of a wire of an electrical conductor, and has a support wall made of a conductive material and a contact spring, which is formed by a one-piece leaf spring made of a suitably bent spring steel sheet. The contact spring has a base leg which is held stationary in relation to the supporting wall and a clamping leg which, together with the supporting wall, forms a plug receptacle for the wire of the conductor which tapers in the insertion direction.
Die Stützwand kann Teil einer leitfähigen Struktur sein, beispielsweise einer Stromschiene oder eines Steckverbinderkontakts. Um die Ader des Leiters mit dieser Struktur in Kontakt zu bringen, wird ein abisoliertes Ende der Ader (z. B. einer Kupferader) in die Steckaufnahme eingesteckt. Das Ende der Ader gleitet dabei auf die Flanke des Klemmschenkels auf und lenkt diesen Klemmschenkel aus. Aufgrund der elastischen Rückstellkraft der Feder krallt sich eine am freien Ende des Klemmschenkels gebildete Greifkante der Kontaktfeder in die Umfangsfläche der Kupferader ein. Wenn man nun versucht, den Leiter zurückzuziehen, so hat die von der Ader auf die Greifkante ausgeübte Kraft die Tendenz, den Klemmschenkel weiter in Richtung auf die Stützwand zu verschwenken und noch fester gegen die Ader anzudrücken, so dass die Ader selbsthemmend in Position gehalten wird. Zum Lösen des Kontakts ist ein Löseorgan vorgesehen, das in Bezug auf die Stützwand in der Einsteckrichtung verschiebbar geführt ist und einen Betätigungsarm aufweist, der an einer der Steckaufnahme zugewandten Flanke des Klemmschenkels angreift. The support wall may be part of a conductive structure, such as a busbar or a connector contact. In order to bring the core of the conductor into contact with this structure, a stripped end of the core (e.g. a copper core) is inserted into the plug receptacle. The end of the wire slides onto the flank of the clamping leg and deflects this clamping leg. Due to the elastic restoring force of the spring, a gripping edge of the contact spring formed at the free end of the clamping leg claws into the circumferential surface of the copper wire. If you now try to pull the conductor back, the force exerted by the wire on the gripping edge has the tendency to pivot the clamping leg further towards the supporting wall and to press it even harder against the wire, so that the wire is held in position in a self-locking manner . To release the contact, a release member is provided, which is guided so as to be displaceable in the insertion direction with respect to the support wall and has an actuating arm which engages on a flank of the clamping leg facing the plug-in receptacle.
Um den Kontakt zu lösen, wird das Löseorgan in Einsteckrichtung verschoben, so dass sein Betätigungsarm auf die Flanke des Klemmschenkels aufläuft und diesen zurückbiegt. Dadurch wird die Ader des Leiters freigegeben, so dass der Leiter aus der Steckaufnahme zurückgezogen werden kann. In order to release the contact, the release element is moved in the insertion direction so that its actuating arm runs onto the flank of the clamping leg and bends it back. This releases the wire of the conductor so that the conductor can be withdrawn from the plug-in receptacle.
Das Deutsche Patent- und Markenamt hat in der Prioritätsanmeldung zur vorliegenden Anmeldung den folgenden Stand der Technik recherchiert: DE 198 10 310 C1 , DE 10 2005 050 399 B3, DE 100 07 090 A1 , The German Patent and Trademark Office has searched the following prior art in the priority application for the present application: DE 198 10 310 C1, DE 10 2005 050 399 B3, DE 100 07 090 A1,
DE 20 2005 010 991 U1 , DE 20 2006 009460 U1 , DE 20 2008 001 997 U1 und FR 1 189 105 A. DE 20 2005 010 991 U1, DE 20 2006 009460 U1, DE 20 2008 001 997 U1 and FR 1 189 105 A.
Aufgabe der Erfindung ist es, den Aufbau einer Kontaktvorrichtung zu ermöglichen, die bei gegebener Haltekraft weniger Bauraum erfordert. The object of the invention is to enable the construction of a contact device that requires less installation space for a given holding force.
Diese Aufgabe wird erfindungsgemäß gelöst durch eine Kontaktfederbaugruppe, die durch mehrere übereinander geschichtete Blattfedern gebildet wird. This object is achieved according to the invention by a contact spring assembly which is formed by several leaf springs stacked one above the other.
Die Ausbildung der Kontaktfeder als mehrlagige Baugruppe hat den Vorteil, dass die geforderte Klemmkraft mit einer geringeren Materialdicke der einzelnen Blattfedern erreicht werden kann. Dadurch kann in dem gebogenen Abschnitt der Biegeradius verringert werden, ohne dass es zu einer Überdehnung des Materials kommt. Aufgrund des kleineren Biegeradius verringert sich der Abstand zwischen den beiden Schenkeln der Kontaktfederbaugruppe und damit der für die Unterbringung dieser Baugruppe in einer Kontaktvorrichtung benötigte Bauraum. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben. Designing the contact spring as a multi-layer assembly has the advantage that the required clamping force can be achieved with a smaller material thickness of the individual leaf springs. This allows the bending radius to be reduced in the curved section without causing over-stretching of the material. Due to the smaller bending radius, the distance between the two legs of the contact spring assembly is reduced and thus the installation space required to accommodate this assembly in a contact device. Advantageous refinements and further developments of the invention are specified in the subclaims.
Die einzelnen Blattfedern der Baugruppe können durch Fügen, beispielsweise durch Kleben, Löten, Schweißen, Nieten oder Clinchen punktuell oder vollflächig miteinander verbunden werden. Bei entsprechender Gestaltung der Einbauumgebung in der Kontaktvorrichtung ist es jedoch auch möglich, dass die Blattfedern unverbunden bleiben und einfach lose aufeinanderliegend in Position gehalten werden. Bei bestimmten Federgeometrien ist es auch möglich, dass sich die einzelnen Blattfedern miteinander ver sten lassen, so dass sie, wenn sie einmal ineinandergesteckt wurden, aufgrund ihrer Eigenelastizität miteinander verbunden bleiben. The individual leaf springs of the assembly can be connected to one another at points or over the entire surface by joining, for example by gluing, soldering, welding, riveting or clinching. However, if the installation environment in the contact device is designed accordingly, it is also possible for the leaf springs to remain unconnected and simply held in position lying loosely on top of each other. With certain spring geometries, it is also possible for the individual leaf springs to be interconnected so that once they have been inserted into one another, they remain connected to one another due to their own elasticity.
Durch Wahl der Anzahl und /oder - bei Blattfedern mit unterschiedlicher Dicke oder aus unterschiedlichen Materialeien - der Schichtungsreihenfolge der Blattfedern lässt sich die Klemmkraft an die jeweiligen Anforderungen anpassen, ohne dass die Geometrie und die Gesamtdicke der Blattfederbaugruppe verändert werden muss. Wahlweise kann die Klemmkraft auch durch die Art der Verbindung der Blattfedern beeinflusst werden. Wenn die Blattfedern unverbunden sind, können sich die Blattfedern gegeneinander verschieben, wenn die Baugruppe gebogen wird. In dem Fall ergibt sich eine relativ geringe Klemmkraft. Wenn die Blattfedern jedoch vollflächig oder mindestens an ihren entgegengesetzten Enden starr miteinander verbunden sind, ist eine relative Verschiebung der einzelnen Blattfedern nicht möglich, so dass das Federpaket einer Verbiegung einen größeren Widerstand entgegensetzt und somit eine höhere Klemmkraft erzeugen kann. By selecting the number and/or - in the case of leaf springs with different thicknesses or made of different materials - the layering sequence of the leaf springs, the clamping force can be adapted to the respective requirements without having to change the geometry and the overall thickness of the leaf spring assembly. Alternatively, the clamping force can also be influenced by the type of connection between the leaf springs. If the leaf springs are unconnected, the leaf springs may shift against each other as the assembly is bent. In this case there is a relatively low clamping force. However, if the leaf springs are rigidly connected to one another over the entire surface or at least at their opposite ends, a relative displacement of the individual leaf springs is not possible, so that the spring package offers greater resistance to bending and can therefore generate a higher clamping force.
Im Folgenden werden Ausführungsbeispiele anhand der Zeichnung näher erläutert. Examples of embodiments are explained in more detail below using the drawing.
Es zeigen: Fig. 1 einen Schnitt durch eine Kontaktvorrichtung mit einer erfindungsgemäßen Kontaktfederbaugruppe; Show it: 1 shows a section through a contact device with a contact spring assembly according to the invention;
Fig. 2 eine Explosionsdarstellung der Kontaktfederbaugruppe; und Fig. 2 is an exploded view of the contact spring assembly; and
Fig. 3 einen vergrößerten Teil-Längsschnitt durch eine Kontaktfederbaugruppe gemäß einem anderen Ausführungsbeispiel. Fig. 3 shows an enlarged partial longitudinal section through a contact spring assembly according to another exemplary embodiment.
Fig. 1 zeigt ein oberes Ende einer Kontaktvorrichtung 10, die einen selbstverriegelnden Steckkontakt für ein abisoliertes Ende einer Ader 12 eines elektrischen Leiters 14 bildet. Die Kontaktvorrichtung weist eine Kontaktfederbaugruppe 16 und eine elektrisch leitfähige Struktur 18 auf, die in ein nicht gezeigtes isolierendes Gehäuse einsetzbar ist und eine Stützwand 20 für die Ader 12 bildet. Am nicht gezeigten unteren Ende kann die leitfähige Struktur 18 z. B. einen Buchsenkontakt bilden. Fig. 1 shows an upper end of a contact device 10, which forms a self-locking plug contact for a stripped end of a wire 12 of an electrical conductor 14. The contact device has a contact spring assembly 16 and an electrically conductive structure 18, which can be inserted into an insulating housing, not shown, and forms a support wall 20 for the wire 12. At the lower end, not shown, the conductive structure 18 can z. B. form a socket contact.
Die Stützwand 20 ist eine von vier Wänden eines Kanals 22, der den größten Teil der Kontaktfederbaugruppe 16 aufnimmt. Eine der Stützwand 20 gegenüberliegende Wand 24 dieses Kanals bildet einen Halter für einen ersten Schenkel 26 der Kontaktfederbaugruppe. Dieser Schenkel 26, der im folgenden als Basisschenkel bezeichnet wird, ist beispielsweise mit Nieten 28 an der Wand 24 gehalten. Ein Ende des Basisschenkels ragt nach oben (entgegen der Einsteckrichtung des Leiters 14) aus dem Kanal 22 heraus und ist dort durch einen gebogenen Abschnitt 30, der einen Biegewinkel von mehr als 270° hat, mit einem zweiten Schenkel 32 der Kontaktfederbaugruppe 16 verbunden. Die Stützwand 20 bildet zusammen mit dem zweiten Schenkel 32, der im folgenden als Klemmschenkel bezeichnet wird, eine Steckaufnahme 34 für die Ader 12. Die Einsteckrichtung ist in Fig. 1 durch einen Pfeil angegeben. Im gezeigten Zustand ist das Ende der Ader 12 noch nicht in die Steckaufnahme 24 eingeführt. Durch den gebogenen Abschnitt 30 wird der Klemmschenkel so gehalten, dass er schräg zur Einsteckrichtung in Richtung der Tiefe der Steckaufnahme 34 verläuft. The support wall 20 is one of four walls of a channel 22 which accommodates most of the contact spring assembly 16. A wall 24 of this channel opposite the supporting wall 20 forms a holder for a first leg 26 of the contact spring assembly. This leg 26, which is referred to below as the base leg, is held on the wall 24 with rivets 28, for example. One end of the base leg projects upwards (against the insertion direction of the conductor 14) out of the channel 22 and is connected there to a second leg 32 of the contact spring assembly 16 by a curved section 30, which has a bending angle of more than 270 °. The supporting wall 20, together with the second leg 32, which is referred to below as the clamping leg, forms a plug-in receptacle 34 for the wire 12. The insertion direction is indicated by an arrow in FIG. In the state shown, the end of the wire 12 is not yet inserted into the plug receptacle 24. The clamping leg is held by the curved section 30 in such a way that it runs obliquely to the insertion direction in the direction of the depth of the plug-in receptacle 34.
In dem in Fig. 1 gezeigten Zustand liegt eine am freien Ende des Klemmschenkels 32 gebildete Greifkante 36 an der Stützwand 20 an. Wenn die Ader 12 weiter in Einsteckrichtung vorgeschoben wird, so wird der Klemmschenkel nach unten gebogen, und die Ader 12 tritt in den Zwischenraum zwischen der Greifkante 36 und der Stützwand 20 ein und wird klemmend in Position gehalten. Wenn dann ein nach oben gerichteter Zug auf die Ader ausgeübt wird, so wird die Ader durch die Greifkante 36 selbsthemmend in Position gehalten. In the state shown in FIG. 1, a gripping edge 36 formed at the free end of the clamping leg 32 lies against the supporting wall 20. If the wire 12 is advanced further in the insertion direction, the clamping leg is bent downwards and the wire 12 enters the space between the gripping edge 36 and the supporting wall 20 and is held in position by clamping. If an upward pull is then exerted on the wire, the wire is held in position in a self-locking manner by the gripping edge 36.
Die Kontaktfederbaugruppe 16 wird nicht durch eine einzelne Blattfeder gebildet, sondern durch eine geschichtete Struktur aus im gezeigten Beispiel drei Blattfedern 38, 40, 42, die vollflächig aneinander anliegen. Jede der drei Blattfedern 38, 40, 42 besteht aus dünnem Federstahlblech, das wahlweise beidseitig eine galvanisch aufgebrachte Korrosionsschutzbeschichtung tragen kann. The contact spring assembly 16 is not formed by a single leaf spring, but by a layered structure made up of three leaf springs 38, 40, 42 in the example shown, which rest against one another over the entire surface. Each of the three leaf springs 38, 40, 42 consists of thin spring steel sheet, which can optionally have a galvanically applied corrosion protection coating on both sides.
Im gezeigten Beispiel haben alle drei Blattfedern 38, 40, 42 die gleiche Dicke. Es sind jedoch auch Ausführungsformen denkbar, bei denen die Dicken der Blattfedern verschieden sind und beispielsweise von innen nach außen (bezogen auf die Krümmung des gebogenen Abschnitts 30) zunehmen oder abnehmen. In jedem Fall ist die Dicke einer einzelnen Blattfeder 38, 40, 42 deutlich kleiner als die Dicke einer herkömmlichen, nur durch eine einlagige Blattfeder gebildeten Kontaktfeder 16‘, die in Fig. 1 zu Vergleichszwecken strichpunktiert darstellt ist. In the example shown, all three leaf springs 38, 40, 42 have the same thickness. However, embodiments are also conceivable in which the thicknesses of the leaf springs are different and, for example, increase or decrease from the inside to the outside (based on the curvature of the curved section 30). In any case, the thickness of an individual leaf spring 38, 40, 42 is significantly smaller than the thickness of a conventional contact spring 16 ', which is formed only by a single-layer leaf spring and is shown in dash-dotted lines in FIG. 1 for comparison purposes.
In Fig. 2 sind die Blattfedern 38, 40, 42 in einer Explosionsdarstellung getrennt voneinander gezeigt. Bei der Herstellung der Kontaktfederbaugruppe 16 werden die Blattfedern 38, 40, 42 zunächst einzeln gebogen und erst dann so ineinander gesteckt, dass sie, wie in Fig. 1 , vollflächig aneinander anliegen. Die geringe Materialdicke der einzelnen Blattfedern 38, 40, 42 erlaubt einen deutlich kleineren Biegeradius als er bei der herkömmlichen Kontaktfeder 16' möglich war. Dadurch wird der für die Kontaktvorrichtung 10 als Ganzes benötigte Bauraum deutlich reduziert. Zu Vergleichszwecken ist in Fig. 1 strichpunktiert auch die Position einer Wand 24' angedeutet, an der die herkömmliche Kontaktfeder 16' mit ihrem Basisschenkel zu befestigen wäre. In Fig. 2, the leaf springs 38, 40, 42 are shown separately from one another in an exploded view. When producing the contact spring assembly 16, the leaf springs 38, 40, 42 are first bent individually and only then inserted into one another so that they rest against one another over the entire surface, as in FIG. 1. The low material thickness of the Individual leaf springs 38, 40, 42 allow a significantly smaller bending radius than was possible with the conventional contact spring 16 '. This significantly reduces the installation space required for the contact device 10 as a whole. For comparison purposes, the position of a wall 24' to which the conventional contact spring 16' would be fastened with its base leg is also indicated by dash-dotted lines in FIG.
Im dem hier gezeigten Beispiel werden die Blattfedern 38, 40, 42 im montierten Zustand durch die Nieten 28 zusammengehalten. Wahlweise können die Blattfedern jedoch auch schon vor der Montage durch Kleben, Löten oder Schweißen miteinander verbunden werden. In the example shown here, the leaf springs 38, 40, 42 are held together by the rivets 28 in the assembled state. Alternatively, the leaf springs can also be connected to one another by gluing, soldering or welding before assembly.
Im gezeigten Beispiel ist der Basisschenkel 26 in dem oberhalb der Wand 24 liegenden Teil etwas nach außen (nach links in Fig. 1 ) geschwenkt. Der Klemmschenkel 32 weist einen Buckel 44 auf, der als Wiederlager für ein hier nicht gezeigtes Löseorgan dient. Wenn die steilere Flanke des Buckels 44 steiler ist als der nach außen geschwenkte Abschnitt des Basisschenkels 26, so lässt sich die innere Blattfeder 42 nur dann von der mittleren Blattfeder 40 lösen, wenn der Klemmschenkel der Blattfeder 42 elastisch ausgelenkt wird, so dass der Buckel 44 dieser Blattfeder aus dem entsprechenden Buckel der Blattfeder 40 austreten kann. Auf diese Weise sind die drei Blattfedern in dem in Fig. 1 gezeigten Zustand gleichsam miteinander ver stet, so dass sie auch ohne die Nieten 28 bereits als eine einzige Einheit handhabbar sind. In the example shown, the base leg 26 is pivoted slightly outwards (to the left in Fig. 1) in the part lying above the wall 24. The clamping leg 32 has a hump 44, which serves as a support for a release element, not shown here. If the steeper flank of the hump 44 is steeper than the outwardly pivoted section of the base leg 26, the inner leaf spring 42 can only be detached from the middle leaf spring 40 if the clamping leg of the leaf spring 42 is deflected elastically, so that the hump 44 This leaf spring can emerge from the corresponding hump of the leaf spring 40. In this way, the three leaf springs are, as it were, interconnected in the state shown in FIG. 1, so that they can be handled as a single unit even without the rivets 28.
Eine andere Möglichkeit, die übereinander geschichteten Blattfedern aneinander zu fixieren, besteht darin, diese Blattfedern punktuell, beispielsweise durch Punktschweißung miteinander zu verbinden. Another way to fix the leaf springs stacked on top of each other is to connect these leaf springs to one another at certain points, for example by spot welding.
Fig. 3 illustriert eine weitere Möglichkeit, bei der die Blattfedern 38, 40, 42 an einem Heftpunkt 46 durch Clinchen miteinander verbunden sind. Fig. 3 illustrates a further possibility in which the leaf springs 38, 40, 42 are connected to one another at a tacking point 46 by clinching.

Claims

Ansprüche Kontaktfederbaugruppe für elektrische Kontaktvorrichtungen (10), mit mindestens einer Blattfeder (38, 40, 42), die zwei durch einen gebogenen Abschnitt (30) miteinander verbundene Schenkel (26, 32) aufweist, wobei der gebogene Abschnitt (30) einen Biegewinkel von mehr als 270° aufweist, dadurch gekennzeichnet, dass die Kontaktfederbaugruppe (16) durch mehrere übereinander geschichtete Blattfedern (38, 40, 42) gebildet wird. Kontaktfederbaugruppe nach Anspruch 1 , bei der der Biegewinkel des gebogenen Abschnitts (30) mehr als 330° beträgt. Kontaktfederbaugruppe nach einem der vorstehenden Ansprüche, bei der die Blattfedern (38, 40, 42) mindestens an einem Punkt der Baugruppe starr aneinander fixiert sind. Kontaktfederbaugruppe nach Anspruch 1 , bei der die Blattfedern (38, 40, 42) an mehreren auf der Länge verteilten Punkten der Baugruppe durch Fügen aneinander fixiert sind Claims Contact spring assembly for electrical contact devices (10), with at least one leaf spring (38, 40, 42) which has two legs (26, 32) connected to one another by a curved section (30), the curved section (30) having a bending angle of has more than 270 °, characterized in that the contact spring assembly (16) is formed by several leaf springs (38, 40, 42) stacked one above the other. Contact spring assembly according to claim 1, in which the bending angle of the curved section (30) is more than 330°. Contact spring assembly according to one of the preceding claims, in which the leaf springs (38, 40, 42) are rigidly fixed to one another at least at one point of the assembly. Contact spring assembly according to claim 1, in which the leaf springs (38, 40, 42) are fixed to one another by joining at several points distributed along the length of the assembly
PCT/DE2023/100450 2022-06-29 2023-06-14 Contact spring assembly for electrical contact devices WO2024002413A1 (en)

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DE102022116188.9 2022-06-29

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1189105A (en) 1955-11-08 1959-09-29 Thermo Electro Sa Improvements to mechanical or electrical connections between parts in the form of rods or cables
DE19810310C1 (en) 1998-03-11 1999-07-15 Phoenix Contact Gmbh & Co Connection port for electrical conductors
DE10007090A1 (en) 2000-02-16 2001-08-23 Schlegel Georg Gmbh & Co Terminal for an insulated conductor
DE202005010991U1 (en) 2005-07-11 2006-11-23 Bals Elektrotechnik Gmbh & Co. Kg Screwless terminal frame terminal
DE202006009460U1 (en) 2005-10-29 2007-03-15 Weidmüller Interface GmbH & Co. KG Connection device for conductors
DE102005050399B3 (en) 2005-10-19 2007-07-26 Phoenix Contact Gmbh & Co. Kg Connecting terminal e.g. print terminal, for use in printed circuit board, has spring force unit with leg spring punched out and molded from material strip for clamping electrical conductor and fastened in openings
DE202008001997U1 (en) 2008-02-14 2008-04-03 Rosenberger Hochfrequenztechnik Gmbh & Co. Kg contact spring
EP3109943A1 (en) * 2015-06-26 2016-12-28 ABB Technology AG Electric connection device for an electrical appliance

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1189105A (en) 1955-11-08 1959-09-29 Thermo Electro Sa Improvements to mechanical or electrical connections between parts in the form of rods or cables
DE19810310C1 (en) 1998-03-11 1999-07-15 Phoenix Contact Gmbh & Co Connection port for electrical conductors
DE10007090A1 (en) 2000-02-16 2001-08-23 Schlegel Georg Gmbh & Co Terminal for an insulated conductor
DE202005010991U1 (en) 2005-07-11 2006-11-23 Bals Elektrotechnik Gmbh & Co. Kg Screwless terminal frame terminal
DE102005050399B3 (en) 2005-10-19 2007-07-26 Phoenix Contact Gmbh & Co. Kg Connecting terminal e.g. print terminal, for use in printed circuit board, has spring force unit with leg spring punched out and molded from material strip for clamping electrical conductor and fastened in openings
DE202006009460U1 (en) 2005-10-29 2007-03-15 Weidmüller Interface GmbH & Co. KG Connection device for conductors
DE202008001997U1 (en) 2008-02-14 2008-04-03 Rosenberger Hochfrequenztechnik Gmbh & Co. Kg contact spring
EP3109943A1 (en) * 2015-06-26 2016-12-28 ABB Technology AG Electric connection device for an electrical appliance

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