EP2242070B1 - Contact assembly for low current use - Google Patents

Contact assembly for low current use Download PDF

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Publication number
EP2242070B1
EP2242070B1 EP10004094.8A EP10004094A EP2242070B1 EP 2242070 B1 EP2242070 B1 EP 2242070B1 EP 10004094 A EP10004094 A EP 10004094A EP 2242070 B1 EP2242070 B1 EP 2242070B1
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EP
European Patent Office
Prior art keywords
contact
piece
assembly according
holder
movable
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Not-in-force
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EP10004094.8A
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German (de)
French (fr)
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EP2242070A1 (en
Inventor
Thomas Freyermuth
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Eaton Electrical IP GmbH and Co KG
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Eaton Electrical IP GmbH and Co KG
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Publication of EP2242070A1 publication Critical patent/EP2242070A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/021—Composite material
    • H01H1/027—Composite material containing carbon particles or fibres
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts

Definitions

  • the invention relates to a contact arrangement for low-current applications.
  • Contact pieces are known from the prior art, which can be produced from coal, graphite or graphite metal mixtures ( DE 844 197 B . DE 20 2005 015 319 U1 ), or in which the materials of the contact pairing are metallic and electrographite ( DD 242 767 B1 . GB 933 239 A ).
  • the invention relates to a contact arrangement comprising at least one fixed contact made of copper and a longitudinally movable contact with a contact bridge carrying the contact pieces.
  • the contacts of the longitudinally movable contact are made of silver graphite ( DE 1049472 AS).
  • Another example of contact mating is from the US-A-1785618 known. It is therefore the object of the invention to present a further development of contact arrangements with contacts formed from carbon material for low-current applications.
  • the contact arrangement is primarily a lift-off or bridge contact, comprising the at least one contact piece and a contact holder carrying the at least one contact piece.
  • contacts made of carbon material have an increased internal resistance (compared to metallic contacts), the proposed contact arrangements have technical and economic advantages in signal and auxiliary switch contacts with control currents of ⁇ 1 A and control voltages up to ⁇ 60 V.
  • control currents of ⁇ 1 A and control voltages up to ⁇ 60 V For example, carbon does not form oxides on its surface , and then when only volatile CO 2 is produced ,
  • a contact point may consist of a conventional AgNi contact.
  • the other contact point is provided with carbon material.
  • the AgNi contact may be corrugated and soldered, welded or riveted to the contact holder.
  • the contact of carbon material may consist of a round rod, a cuboid or a small plate, which is glued with graphite adhesive on the contact holder.
  • the second contact material may consist of 70 wt .-% or more carbon material and a balance of metal powder.
  • a composition is also called metal graphite or called metal-impregnated, for its production, mixtures of metal powders, in particular copper, tin or lead, with graphite, in particular natural graphite, pressed and then solidified by annealing or sintering.
  • the second contact material may also be made completely (100% by weight) of carbon material.
  • Such layered carbon materials are also counted among the applications of the invention.
  • At least one of the contact elements can be provided with a corrugation or grooves. Corrugations should also be present on the associated contact-making elements, preferably in such a way that the corrugations on the correspondingly assigned contact elements have an orientation rotated by 90 ° relative to one another.
  • the contact arrangement preferably has two fixed contacts, wherein the fixed contacts at least one contact piece of carbon material bridging the fixed contacts is assigned.
  • the or the contact piece (s) is / are attached to the contact bridge, with adhesive joints or mechanical brackets in question.
  • the material of the contact bridge may be metallic, ie conductive or insulating. Since at least one contact piece used is, which lies with its entire length on the contact bridge and bridges the fixed contacts in the closed state of the contact arrangement, the material of the contact bridge can also be an electrical insulator.
  • the at least one contact piece may be formed as a round rod or as a cuboidal plate.
  • the rods may be formed as a solid cylinder or as a half cylinder. In a half cylinder, the flat side of the half cylinder would be usable as an adhesive surface.
  • the at least one contact piece can be fastened to the contact bridge with at least one clip.
  • Contact pieces in particular those in the form of round rods, may be held in sockets on or in the contact bridge.
  • the contact holder and the at least one contact piece of the moving contact can be formed in one piece.
  • contact holder and contact piece form a unit that can be connected to each other for example by gluing.
  • it can proceed that the carbon material of contact holder and contact piece has a uniform composition.
  • the invention assumes that the moving contact is machined (milled out) from a single piece of material of uniform composition.
  • the contact holder and / or the at least one contact piece should have a contour in the form of a rectangle in a plane perpendicular to the actuating direction of the contact arrangement. It can be formed on the parallel to the distance of the fixed contacts extending longitudinal sides of the rectangle formations that serve as a target or attack points for guides, brackets and / or attachments.
  • a fastening of Maisandruckfedern or actuating tappets serving, cylindrical pin.
  • the pin lies centrally on the contact holder or the contact piece and extends, projecting from the surface of the contact holder or the contact piece parallel to the actuating direction of the contact arrangement.
  • the figures each show views of moving contacts T.
  • the moving contacts comprise at least one of the stationary contacts FK (see Fig. 1 ) associated contact piece.
  • the stationary contacts may be below or above a moving contact.
  • the contacts KQ, KS made of carbon material are drawn with hatching. They are held by a contact holder H or can be glued by means of graphite adhesive.
  • the contact bridges (also the contact holders or the contact pieces) generally have the shape of a rectangular parallelepiped.
  • semicircular notches S may be formed as guide grooves, which also serve as attack points or surfaces for brackets and / or attachments in addition to the cylindrical pin FF.
  • a contact bridge (moving contact) is shown, which is completely - so the carrier form and the edge formation - made of carbon material.
  • the entire moving contact thus contact holder H and contact piece KQ, KS are formed by a single cuboid body made of carbon material in the length of the moving contact.
  • the contact piece in the integrally formed moving contact can also - unlike in Fig. 1 be designed round (as a half or full cylinder): see.
  • Fig. 4
  • the Fig. 2A shows a contact bridge, in the full length (aligned parallel to the fixed contacts) applied a plate KQ made of carbon material, for example, is glued.
  • the contact holder H can also be formed of an insulating material in such an arrangement.
  • an arrangement is shown in the drawing, in which two round rods KS are present parallel to each other, which are taken for example by a contact holder or glued to the contact holder.
  • the round rods each bridge the fixed contacts and can be used as a solid cylinder or as a semi-cylinder KS (as in Fig. 2B ) be formed.
  • the flat side of the half-cylinder can be used as an adhesive surface for attachment to the contact holder.
  • FIGS. 3, 4 and 5 each show an arrangement in which the at least one contact piece has a greater length than the contact holder H.
  • the contact piece projects beyond the contact holder on both sides.
  • FIG. 3 A method of attachment by means of two mounting brackets B for a small plate KQ made of carbon material is shown.
  • FIG. 4 an embodiment of a contact bridge is presented, in which a round rod KS made of carbon material is attached to the contact bridge with a contact holder H made of plastic. This completely eliminates adhesive bonds and associated contact resistance.
  • Fig. 5 is - comparable to Fig. 2 - A cuboidal plate KQ of carbon material accommodated in the contact bridge T, wherein the length of the plate KQ is greater than the length of the contact holder, so that the plate KQ the contact holder (also) surmounted on both sides. It is indicated by dashed lines that the plate can have different widths.
  • Such a contact holder made of plastic - after Fig. 5 - Can be made for example by molding the small plate KQ.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Contacts (AREA)

Description

Die Erfindung betrifft eine Kontaktanordnung für Schwachstromanwendungen.The invention relates to a contact arrangement for low-current applications.

Es besteht ein Bedarf für spezielle Kontaktanordnungen für Schwachstromanwendungen, insbesondere in elektrischen Geräten oder elektrischen Schaltungen, die mit elektronischen Steuerungen ausgebildet sind. Hilfs- oder Signalschalterkontakte in solchen Anwendungen schalten nur sehr kleine Ströme (< 1 A), bei geringen Steuerspannungen, etwa bis 60 V. Für geringe Ströme, etwa kleiner als 100 mA, werden Materialien mit geringem Eigenwiderstand (Gold, Silber, Kupfer) bevorzugt verwendet; nicht zuletzt auch wegen der Oxidbildung bei unedleren Metallen.There is a need for special contact arrangements for low power applications, particularly in electrical appliances or electrical circuits formed with electronic controls. Auxiliary or signal switch contacts in such applications switch only very small currents (<1 A), with low control voltages, for example up to 60 V. For low currents, for example less than 100 mA, materials with low intrinsic resistance (gold, silver, copper) are preferred used; not least because of the oxide formation in less noble metals.

Metallischer Abrieb der Kontakte führt zu dem Nachteil, dass feinkörnige Teilchen leicht oxidieren und die Kontaktgabe verschlechtern oder der Kontaktwerkstoff selbst ein nicht leitendes Oxid bildet. Zur Vermeidung oder Verminderung von Oxidbildung, Ablagerung von Schmutz auf den Kontaktflächen und zur Verringerung die Abnutzung der Kontaktflächen werden Brückenkontakte mit Sprühölnebel versehen. Der Einsatz solcher Kontaktanordnungen, die auf bisher verwendete Standardkontakte zurückgehen, sind daher aus verschiedenen Gründen nicht mehr angebracht.Metallic abrasion of the contacts leads to the disadvantage that fine-grained particles easily oxidize and deteriorate the contact or the contact material itself forms a non-conductive oxide. To avoid or reduce the formation of oxide, dirt deposits on the contact surfaces and to reduce the wear of the contact surfaces bridge contacts are provided with spray oil mist. The use of such contact arrangements, which go back to standard contacts used previously, are therefore no longer appropriate for various reasons.

Aus dem Stand der Technik sind Kontaktstücke bekannt, die aus Kohle, Grafit oder Grafitmetall-Mischungen hergestellt sein können ( DE 844 197 B , DE 20 2005 015 319 U1 ), oder bei denen die Werkstoffe der Kontaktpaarung metallisch und Elektrografit sind ( DD 242 767 B1 , GB 933 239 A ). Die Erfindung geht aus von einer Kontaktanordnung, die mindestens einen Festkontakt aus Kupfer und einen längsbeweglichen Kontakt mit einer die Kontaktstücke tragenden Kontaktbrücke umfasst. Die Kontaktstücke des längsbeweglichen Kontakts sind aus Silbergrafit gefertigt ( DE 1049472 AS). Ein weiteres Beispiel von Kontaktpaarung ist aus der US-A-1785618 bekannt. Es ist daher die Aufgabe der Erfindung, eine Weiterentwicklung von Kontaktanordnungen mit aus Kohlenstoffwerkstoff gebildeten Kontakten für Schwachstromanwendungen vorzulegen.Contact pieces are known from the prior art, which can be produced from coal, graphite or graphite metal mixtures ( DE 844 197 B . DE 20 2005 015 319 U1 ), or in which the materials of the contact pairing are metallic and electrographite ( DD 242 767 B1 . GB 933 239 A ). The invention relates to a contact arrangement comprising at least one fixed contact made of copper and a longitudinally movable contact with a contact bridge carrying the contact pieces. The contacts of the longitudinally movable contact are made of silver graphite ( DE 1049472 AS). Another example of contact mating is from the US-A-1785618 known. It is therefore the object of the invention to present a further development of contact arrangements with contacts formed from carbon material for low-current applications.

Die Aufgabe wird erfindungsgemäß durch die Merkmale des unabhängigen Anspruches gelöst, während den abhängigen Ansprüchen vorteilhafte Weiterbildungen der Erfindung zu entnehmen sind.The object is achieved by the features of the independent claim, while the dependent claims advantageous developments of the invention can be found.

Kern der Erfindung besteht darin, dass die elektrische Kontaktanordnung für Schwachstromanwendungen umfasst:

  • zwei Festkontakte aus einem ersten Kontaktwerkstoff,
  • einen mit den Festkontakten in Schließ- und Öffnungsstellung bringbaren Bewegtkontakt, wobei der die Festkontakte überbrückende Bewegtkontakt aus einem Kontakthalter und mindestens einem Kontaktstück aus einem zweiten Kontaktwerkstoff besteht,
  • einen das mindestens eine Kontaktstück am Bewegtkontakt tragenden Kontakthalter, wobei der Bewegtkontakt auf die Festkontakte hin längsbeweglich betätigbar ist,
wobei eine Materialpaarung der kontaktgebenden Elemente derart vorgesehen ist, dass der erste Kontaktwerkstoff aus einem metallischen Leiterwerkstoff besteht, vorzugsweise aus einer Kupfer- oder Silberlegierung und der zweite Kontaktwerkstoff eine Zusammensetzung hat, die aus mindestens 70 Gew.-% und maximal 100 Gew.-% Kohlenstoffwerkstoff besteht, und dass am Bewegtkontakt mindestens ein die Festkontakte überbrückendendes Kontaktstück vorhanden ist. Wenn im folgenden von Grafit gesprochen wird, steht diese Bezeichnung allgemein für jeweils einen der verwendeten Kohlenstoffwerkstoffe. Bevorzugt wird insbesondere isostatisch gepresster Grafit (auch unter der Bezeichnung Iso-Grafit bekannt) für die Kontaktstücke vorgeschlagen.The core of the invention is that the electrical contact arrangement for low-current applications comprises:
  • two fixed contacts made of a first contact material,
  • a movable contact which can be brought into the closed and open position with the fixed contacts, wherein the moving contact bridging the fixed contacts consists of a contact holder and at least one contact piece of a second contact material,
  • a contact holder carrying the at least one contact piece on the moving contact, wherein the moving contact can be longitudinally movably actuated on the fixed contacts,
wherein a material pairing of the contact-making elements is provided such that the first contact material consists of a metallic conductor material, preferably of a copper or silver alloy and the second contact material has a composition which comprises at least 70 wt .-% and at most 100 wt .-% Carbon material is made, and that the moving contact at least one of the fixed contacts bridging contact piece is present. In the following, when graphite is used, this designation generally refers to one of the carbon materials used. In particular, isostatically pressed graphite (also known by the name iso-graphite) is preferably proposed for the contact pieces.

Die Kontaktanordnung ist vornehmlich ein Abhebe- oder Brückenkontakt, umfassend das mindestens eine Kontaktstück und einen das mindestens eine Kontaktstück tragenden Kontakthalter.The contact arrangement is primarily a lift-off or bridge contact, comprising the at least one contact piece and a contact holder carrying the at least one contact piece.

Obwohl Kontakte aus Kohlenstoffwerkstoff einen erhöhten Innenwiderstand aufweisen (im Vergleich zu metallischen Kontakten) haben die vorgeschlagenen Kontaktanordnungen technische und wirtschaftliche Vorteile bei Signal- und Hilfsschalterkontakten mit Steuerströmen von < 1 A und Steuerspannungen bis < 60 V. Zum Beispiel bildet Kohlenstoff keine Oxide an seiner Oberfläche, und wenn dann entsteht nur flüchtiges CO2,Although contacts made of carbon material have an increased internal resistance (compared to metallic contacts), the proposed contact arrangements have technical and economic advantages in signal and auxiliary switch contacts with control currents of <1 A and control voltages up to <60 V. For example, carbon does not form oxides on its surface , and then when only volatile CO 2 is produced ,

Versuche haben gezeigt, dass massive Kontakte aus Kohlenstoffwerkstoff bei der Schaltung von Signalströmen (24 V, max 1A) nicht brechen. Massive Kontakte aus Kohlenstoffwerkstoff haben geringe Masse (dadurch auch geringes Prellverhalten, somit schnellere Bereitschaft zur Signalübertragung). Sprühölnebel sind nicht notwendig, da eine Erhöhung des Kontaktwiderstandes während des Betriebs nicht auftritt. Die Kontakte sind wirtschaftlicher, da kein Edelmetall oder Kupfer verwendet wird. Kontakte aus Kohlenstoffwerkstoff sind leichter als Metallkontakte. Der Bewegtkontakt hat also eine kleinere Masse, die durch den Antrieb bewegt und gebremst werden muss. Kohlenstoffwerkstoff als Abrieb kann die kontaktgebenden Teile schmieren. Dadurch, dass der Abrieb leitend bleibt und nicht oxidiert, vermindert er nicht die Kontaktgabe. Auch ein Verschweißen oder Verkleben der Kontakte wird durch Grafit verhindert. Mechanische Führungen und Gleitflächen im Kontakt-Apparat werden durch Grafit-Abrieb zusätzlich geschmiert und die Gleiteigenschaften werden nicht wie bei Metallabrieb verschlechtert. Eine Kontaktstelle kann aus einem herkömmlichen AgNi-Kontakt bestehen. Die andere Kontaktstelle ist mit Kohlenstoffwerkstoff versehen. Der AgNi-Kontakt kann mit einer Riffelung versehen sein und ist auf den Kontakthalter aufgelötet, geschweißt oder vernietet. Der Kontakt aus Kohlenstoffwerkstoff kann aus einem Rundstäbchen, einem Quader oder aus einem Plättchen bestehen, welches mit Grafitkleber auf den Kontakthalter geklebt ist.Experiments have shown that massive contacts made of carbon material do not break when switching signal currents (24 V, max 1A). Solid contacts made of carbon material have low mass (thus also low bounce behavior, thus faster readiness for signal transmission). Spray oil mist is not necessary since an increase in contact resistance during operation does not occur. The contacts are more economical because no precious metal or copper is used. Carbon material contacts are lighter than metal contacts. The moving contact thus has a smaller mass that has to be moved and braked by the drive. Carbon material as abrasion can lubricate the contacting parts. The fact that the abrasion remains conductive and does not oxidize, it does not reduce the contact. Welding or gluing the contacts is prevented by graphite. Mechanical guides and sliding surfaces in the contact apparatus are additionally lubricated by graphite abrasion and the sliding properties are not degraded as with metal abrasion. A contact point may consist of a conventional AgNi contact. The other contact point is provided with carbon material. The AgNi contact may be corrugated and soldered, welded or riveted to the contact holder. The contact of carbon material may consist of a round rod, a cuboid or a small plate, which is glued with graphite adhesive on the contact holder.

Weitere Ausführungsformen finden sich in folgendem:Further embodiments can be found in the following:

Der zweite Kontaktwerkstoff kann aus 70 Gew.-% oder mehr Kohlenstoffwerkstoff und einem Rest aus Metallpulver bestehen. Eine solche Zusammensetzung wird auch Metallgrafit genannt oder metall-imprägniert genannt, zu dessen Herstellung Mischungen von Metallpulvern, insbesondere Kupfer, Zinn oder Blei, mit Grafit, insbesondere Naturgrafit, verpresst und anschließend durch Glühen oder Sintern verfestigt werden. Der zweite Kontaktwerkstoff kann auch vollständig (100 Gew.-%) aus Kohlenstoffwerkstoff bestehen. Es gibt Material zur mechanischen Abdichtung von sich berührenden Kontaktflächen, wobei das Dichtmaterial aus mehreren dünnen Schichten reinen Grafits besteht, und die Grafitschichten miteinander mit Klebeschichten verbunden sind. Derartig schichtartig aufgebaute Kohlenstoffwerkstoffe werden ebenfalls zu den erfindungsgemäßen Anwendungen gezählt.The second contact material may consist of 70 wt .-% or more carbon material and a balance of metal powder. Such a composition is also called metal graphite or called metal-impregnated, for its production, mixtures of metal powders, in particular copper, tin or lead, with graphite, in particular natural graphite, pressed and then solidified by annealing or sintering. The second contact material may also be made completely (100% by weight) of carbon material. There is material for mechanical sealing of contacting contact surfaces, wherein the sealing material consists of several thin layers of pure graphite, and the graphite layers are bonded together with adhesive layers. Such layered carbon materials are also counted among the applications of the invention.

Mindestens eines der kontaktgebenden Elemente (am Festkontakt oder am Bewegtkontakt) kann mit einer Riffelung oder Riefen versehen sein. Riffelungen sollten ebenfalls auf den zugeordneten kontaktgebenden Elementen, vorzugsweise derart vorhanden sein, dass die Riffelungen auf den entsprechend zugeordneten Kontaktelementen eine gegeneinander um 90° gedrehte Orientierung haben.At least one of the contact elements (on the fixed contact or on the moving contact) can be provided with a corrugation or grooves. Corrugations should also be present on the associated contact-making elements, preferably in such a way that the corrugations on the correspondingly assigned contact elements have an orientation rotated by 90 ° relative to one another.

Die Kontaktanordnung hat vorzugsweise zwei Festkontakte, wobei den Festkontakten mindestens ein die Festkontakte überbrückendes Kontaktstück aus Kohlenstoffwerkstoff zugeordnet ist.The contact arrangement preferably has two fixed contacts, wherein the fixed contacts at least one contact piece of carbon material bridging the fixed contacts is assigned.

Das oder die Kontaktstück(e) ist/sind an der Kontaktbrücke befestigt, wobei Klebeverbindungen oder mechanische Halterungen infrage kommen. Das Material der Kontaktbrücke kann metallisch, also leitend oder isolierend ausgebildet sein. Da mindestens ein Kontaktstück eingesetzt wird, welches mit seiner gesamten Länge auf der Kontaktbrücke liegt und die Festkontakte im Schließzustand der Kontaktanordnung überbrückt, kann der Werkstoff der Kontaktbrücke auch ein elektrischer Isolator sein.The or the contact piece (s) is / are attached to the contact bridge, with adhesive joints or mechanical brackets in question. The material of the contact bridge may be metallic, ie conductive or insulating. Since at least one contact piece used is, which lies with its entire length on the contact bridge and bridges the fixed contacts in the closed state of the contact arrangement, the material of the contact bridge can also be an electrical insulator.

Das mindestens eine Kontaktstück kann als Rundstab oder als quaderförmiges Plättchen ausgebildet sein. Die Rundstäbe können als Vollzylinder oder als Halbzylinder ausgebildet sein. Bei einem Halbzylinder würde die flache Seite des Halbzylinders als Klebefläche nutzbar sein.The at least one contact piece may be formed as a round rod or as a cuboidal plate. The rods may be formed as a solid cylinder or as a half cylinder. In a half cylinder, the flat side of the half cylinder would be usable as an adhesive surface.

Das mindestens eine Kontaktstück kann mit mindestens einer Klammer an der Kontaktbrücke befestigt sein.The at least one contact piece can be fastened to the contact bridge with at least one clip.

Kontaktstücke, insbesondere solche in Form von Rundstäben, können in Fassungen an oder in der Kontaktbrücke gehaltert sein.Contact pieces, in particular those in the form of round rods, may be held in sockets on or in the contact bridge.

In der Kontaktanordnung können der Kontakthalter und das mindestens eine Kontaktstück des Bewegtkontakts einstückig ausgebildet sein. Damit bilden Kontakthalter und Kontaktstück eine Einheit, die beispielsweise durch Kleben miteinander verbunden sein können. Insbesondere kann vorgehen sein, dass der Kohlenstoffwerkstoff von Kontakthalter und Kontaktstück eine einheitliche Zusammensetzung hat. In letzterem Fall geht die Erfindung davon aus, dass der Bewegtkontakt aus einem einzigen Materialstück einheitlicher Zusammensetzung herausgearbeitet (herausgefräst) ist.In the contact arrangement, the contact holder and the at least one contact piece of the moving contact can be formed in one piece. Thus, contact holder and contact piece form a unit that can be connected to each other for example by gluing. In particular, it can proceed that the carbon material of contact holder and contact piece has a uniform composition. In the latter case, the invention assumes that the moving contact is machined (milled out) from a single piece of material of uniform composition.

Der Kontakthalter und/oder das mindestens eine Kontaktstück sollten in einer Ebene senkrecht zur Betätigungsrichtung der Kontaktanordnung einen Umriss in Form eines Rechtecks haben. Dabei können an den sich parallel zum Abstand der Festkontakte erstreckenden Längsseiten des Rechtecks Ausformungen ausgebildet sein, die als Angriffsfläche oder Angriffspunkte für Führungen, Halterungen und/oder Befestigungen dienen.The contact holder and / or the at least one contact piece should have a contour in the form of a rectangle in a plane perpendicular to the actuating direction of the contact arrangement. It can be formed on the parallel to the distance of the fixed contacts extending longitudinal sides of the rectangle formations that serve as a target or attack points for guides, brackets and / or attachments.

An dem Kontakthalter oder am Kontaktstück kann ein der Befestigung von Kontaktandruckfedern oder Betätigungsstößeln dienender, zylindrischer Zapfen ausgebildet sein. Der Zapfen liegt dabei mittig auf dem Kontakthalter oder dem Kontaktstück und erstreckt sich, abstehend von der Oberfläche des Kontakthalters oder des Kontaktstücks parallel zur Betätigungsrichtung der Kontaktanordnung.On the contact holder or on the contact piece may be formed a fastening of Kontaktandruckfedern or actuating tappets serving, cylindrical pin. The pin lies centrally on the contact holder or the contact piece and extends, projecting from the surface of the contact holder or the contact piece parallel to the actuating direction of the contact arrangement.

Die Merkmale der Erfindung können einzeln oder gemeinsam in verschiedenen Weiterbildungen ausgebildet sein.The features of the invention may be formed individually or together in various developments.

Weitere Einzelheiten und Vorteile der Erfindung werden mit mehreren Ausführungsbeispielen anhand von Figuren erläutert. Sie zeigen im Einzelnen

  • Fig. 1: eine Kontaktbrücke vollständig aus Kohlenstoffwerkstoff,
  • Fig. 2A und 2B: eine Kontaktbrücke mit quaderförmigem Plättchen oder mit Rundstäbchen,
  • Fig. 3: eine Kontaktbrücke mit einem Kontaktstück gehaltert mit Befestigungsklammern,
  • Fig. 4: eine Kontaktbrücke mit einem Kontaktstück als Rundstab und
  • Fig. 5: eine Kontaktbrücke mit einem plättchenförmigen Kontaktstück gehaltert in der Kontaktbrücke.
Further details and advantages of the invention will be explained with several embodiments with reference to figures. They show in detail
  • Fig. 1 a contact bridge made entirely of carbon material,
  • FIGS. 2A and 2B a contact bridge with cuboidal plate or round sticks,
  • Fig. 3 a contact bridge with a contact piece held with fixing clips,
  • Fig. 4 : a contact bridge with a contact piece as a round rod and
  • Fig. 5 : a contact bridge with a plate-shaped contact piece held in the contact bridge.

Die Figuren zeigen jeweils Ansichten von Bewegtkontakten T. Die Bewegtkontakte umfassen mindestens ein den stationären Kontakten FK (siehe Fig. 1) zugeordnetes Kontaktstück. Die stationären Kontakte können sich unterhalb oder auch oberhalb eines Bewegtkontakts befinden.The figures each show views of moving contacts T. The moving contacts comprise at least one of the stationary contacts FK (see Fig. 1 ) associated contact piece. The stationary contacts may be below or above a moving contact.

Die Kontaktstücke KQ, KS aus Kohlenstoffwerkstoff sind mit Schraffur gezeichnet. Sie werden von einem Kontakthalter H gehalten oder können mittels Grafitkleber aufgeklebt sein.The contacts KQ, KS made of carbon material are drawn with hatching. They are held by a contact holder H or can be glued by means of graphite adhesive.

In den Figuren sind zusätzlich Seitenansichten (jeweils unterhalb) von vorn und (jeweils rechts) von der Seite gezeichnet. Die (zwei) stationären Kontakte werden durch den beweglichen Kontakt unter dem Druck eines Federmittels überbrückt oder von einem Rückstell-Element (Kontaktstößel) offen gehalten. Rückstellelemente (beispielsweise Federn), die den Bewegtkontakt in Kontaktposition mit den Festkontakten bringen, sind allerdings nicht dargestellt. Die Kontaktanordnung kann von einem Kontaktstößel betätigt werden, wobei die Betätigung des Bewegtkontakts gegen die Rückstellkraft eines Rückstell-Elements oder gegen die Andruckkraft eines Federmittels erfolgen kann.In the figures, side views are additionally drawn (each below) from the front and (respectively right) of the page. The (two) stationary contacts are bridged by the movable contact under the pressure of a spring means or kept open by a return element (contact plunger). Reset elements (such as springs), which bring the moving contact in contact position with the fixed contacts, however, are not shown. The contact arrangement can be actuated by a contact plunger, wherein the actuation of the moving contact can take place against the restoring force of a return element or against the pressing force of a spring means.

Mit Bezugszeichen FF sind jeweils Führungen in Form kurzer, zylindrischer Zapfen eingezeichnet, die der Halterung und/oder der Befestigung von Kontaktandruckfedern oder Betätigungsstößeln dienen sollen.With reference numeral FF guides in the form of short, cylindrical pins are shown, which are intended to serve the holder and / or the attachment of Kontaktandruckfedern or actuating tappets.

Die Kontaktbrücken (auch die Kontakthalter oder die Kontaktstücke) haben im allgemeinen die Form eines rechteckigen Quaders. An den längeren Seiten der Rechteckform können halbkreisförmige Einkerbungen S als Führungsrillen ausgebildet sein, die zusätzlich neben den zylindrischen Zapfen FF auch als Angriffspunkte oder -flächen für Halterungen und/oder Befestigungen dienen.The contact bridges (also the contact holders or the contact pieces) generally have the shape of a rectangular parallelepiped. On the longer sides of the rectangular shape semicircular notches S may be formed as guide grooves, which also serve as attack points or surfaces for brackets and / or attachments in addition to the cylindrical pin FF.

In Fig. 1 ist eine Kontaktbrücke (Bewegtkontakt) dargestellt, die vollständig - also auch die Trägerform und die Randausbildung - aus Kohlenstoffwerkstoff hergestellt ist. Der gesamte Bewegtkontakt, somit Kontakthalter H und Kontaktstück KQ, KS sind durch einen einzigen quaderförmigem Körper aus Kohlenstoffwerkstoff in Länge des Bewegtkontakts gebildet. Somit entfällt ein Befestigungs-, bzw. Klebevorgang des Kontaktstücks KQ, KS an der Kontaktbrücke. Das Kontaktstück im einstückig ausgebildeten Bewegtkontakt kann auch - anders als in Fig. 1 - rund (als Halb- oder als Vollzylinder) ausgebildet sein: vgl. Fig. 4.In Fig. 1 a contact bridge (moving contact) is shown, which is completely - so the carrier form and the edge formation - made of carbon material. The entire moving contact, thus contact holder H and contact piece KQ, KS are formed by a single cuboid body made of carbon material in the length of the moving contact. Thus eliminates a fastening, or gluing process of the contact piece KQ, KS at the contact bridge. The contact piece in the integrally formed moving contact can also - unlike in Fig. 1 be designed round (as a half or full cylinder): see. Fig. 4 ,

Die Fig. 2A zeigt eine Kontaktbrücke, bei der auf voller Länge (ausgerichtet parallel zu den Festkontakten) ein Plättchen KQ aus Kohlenstoffwerkstoff aufgebracht, beispielsweise geklebt ist. Der Kontakthalter H kann in einer solchen Anordnung auch aus einem Isolierwerkstoff gebildet sein. In der Seitenansicht 2B ist eine Anordnung zeichnerisch dargestellt, bei der zwei Rundstäbchen KS parallel zueinander vorhanden sind, die beispielsweise von einem Kontakthalter gefasst sind oder auf den Kontakthalter aufgeklebt sind. Die Rundstäbchen überbrücken jeweils die Festkontakte und können als Vollzylinder oder als Halbzylinder KS (wie in Fig. 2B) ausgebildet sein. In der letztgenannten Ausführungsform kann die Flachseite des Halbzylinders als Klebefläche zur Befestigung an dem Kontakthalter genutzt werden.The Fig. 2A shows a contact bridge, in the full length (aligned parallel to the fixed contacts) applied a plate KQ made of carbon material, for example, is glued. The contact holder H can also be formed of an insulating material in such an arrangement. In the side view 2B an arrangement is shown in the drawing, in which two round rods KS are present parallel to each other, which are taken for example by a contact holder or glued to the contact holder. The round rods each bridge the fixed contacts and can be used as a solid cylinder or as a semi-cylinder KS (as in Fig. 2B ) be formed. In the latter embodiment, the flat side of the half-cylinder can be used as an adhesive surface for attachment to the contact holder.

Die Figuren 3, 4 und 5 zeigen jeweils eine Anordnung, bei der das mindestens eine Kontaktstück eine größere Länge hat als der Kontakthalter H. Das Kontaktstück überragt den Kontakthalter beidseitig.The FIGS. 3, 4 and 5 each show an arrangement in which the at least one contact piece has a greater length than the contact holder H. The contact piece projects beyond the contact holder on both sides.

In Fig. 3 wird eine Befestigungsart mittels zweier Befestigungsklammern B für ein Plättchen KQ aus Kohlenstoffwerkstoff dargestellt.In Fig. 3 A method of attachment by means of two mounting brackets B for a small plate KQ made of carbon material is shown.

Mit Fig. 4 wird eine Ausführungsform einer Kontaktbrücke vorgestellt, bei der ein Rundstab KS aus Kohlenstoffwerkstoff an der Kontaktbrücke mit einem Kontakthalter H aus Kunststoff befestigt ist. Hierbei entfallen dann völlig Klebeverbindungen und damit verbundene Übergangswiderstände.With Fig. 4 an embodiment of a contact bridge is presented, in which a round rod KS made of carbon material is attached to the contact bridge with a contact holder H made of plastic. This completely eliminates adhesive bonds and associated contact resistance.

In der Fig. 5 ist - vergleichbar mit Fig. 2 - ein quaderförmiges Plättchen KQ aus Kohlenstoffwerkstoff in der Kontaktbrücke T untergebracht, wobei die Länge des Plättchens KQ größer ist als die Länge des Kontakthalters, so dass das Plättchen KQ den Kontakthalter (ebenfalls) auf beiden Seiten überragt. Angedeutet ist durch gestrichelt gezeichnete Linien, dass das Plättchen unterschiedliche Breite haben kann. Ein solcher Kontakthalter aus Kunststoff - nach Fig. 5 - kann zum Beispiel durch Umspritzen des Plättchens KQ gefertigt werden.In the Fig. 5 is - comparable to Fig. 2 - A cuboidal plate KQ of carbon material accommodated in the contact bridge T, wherein the length of the plate KQ is greater than the length of the contact holder, so that the plate KQ the contact holder (also) surmounted on both sides. It is indicated by dashed lines that the plate can have different widths. Such a contact holder made of plastic - after Fig. 5 - Can be made for example by molding the small plate KQ.

Bezugszeichenreference numeral

TT
Kontaktbrücke (Bewegtkontakt)Contact bridge (moving contact)
HH
Kontakthaltercontact holder
KSKS
Kontaktstück in RundstabformContact piece in round rod form
KQKQ
Kontaktstück in Quader- oder PlättchenformContact piece in cuboid or platelet form
SS
Stanzungen, EinkerbungenPunches, notches
BB
BefestigungsklammerCrab
FFFF
Zapfen als Halterung oder Führung für Kontaktandruckfeder oder KontaktstößelPin as a holder or guide for Kontaktandruckfeder or contact plunger
FKFK
Festkontaktfixed contact

Claims (12)

  1. Electrical contact assembly for low current use, comprising:
    • two fixed contacts (FK) from a first contact material,
    • a movable contact (T) connectable with the fixed contacts (FK) in a closed and open position, wherein
    the movable contact (T) which bridges the fixed contact (FK) consists of a contact holder (H) and at least one contact piece (KS, KQ) from the second contact material,
    • a contact holder (H) supporting the at least one contact piece (KS, KQ) on the movable contact (T), wherein the movable contact (T) is movable in a longitudinal direction and operable on the fixed contacts (FK),
    wherein a material pairing of the contact-making elements is designed in such a way that the first contact material consists of a metallic conductor material, preferably of a copper or silver alloy, and the second contact material has a composition including minimum 70% and maximum 100% weight of carbon material, wherein at least one contact piece (KS, KQ) is available on the movable contact, which bridges the respective fixed contacts (FK).
  2. Contact assembly according to claim 1, characterised in that the carbon material is an isostatically pressed graphite material.
  3. Contact assembly according to one of the previous claims characterised in that the carbon material is multilayered with intermediate adhesive layers.
  4. Contact assembly according to one of the previous claims, characterised in that at least one contact piece (FK, KQ, KS) of a pair of contact-making elements is equipped with a riffle.
  5. Contact assembly according to one of the previous claims, characterised in that the at least one contact piece of the movable contact (T) is designed as a rod (KS) or as a prismatic disc (KQ).
  6. Contact assembly according to claim 5, characterised in that the at least one contact piece (KQ, KS) of the movable contact (T) is clamped with at least one clip (B) on the contact holder (H).
  7. Contact assembly according to one of the previous claims, characterised in that the at least one contact piece (KQ, KS) of the movable contact (T) is glued on the contact holder (H).
  8. Contact assembly according to one of the claims 1 to 4, characterised in that two parallel adjoining rods (KS) are connected to the movable contact (T).
  9. Contact assembly according to one of the claims 1 to 5, characterised in that the contact holder (H) and the at least one contact piece (KQ, KS) of the movable contact (T) are designed in one piece.
  10. Contact assembly according to claim 9, characterised in that the carbon material of the contact holder (H) and of the contact piece (KQ, KS) of the movable contact (T) has a uniform composition.
  11. Contact assembly according to one of the previous claims, characterised in that the contact holder (H) and/or the at least one contact piece (KQ, KS) has a form of a rectangle in a level perpendicular to the operating direction of the contact assembly, wherein forms (S) are designed on the long sides of the rectangle stretching parallel to the distance of the fixed contacts (FK), which serve as a contact surface for guides, supports and/or fixtures.
  12. Contact assembly according to one of the previous claims, characterised in that a cylindrical pivot (FF) helping the fastening of contact pressure springs or operating tappets is designed on the contact holder (H) and/or on the at least one contact piece (KQ, KS).
EP10004094.8A 2009-04-18 2010-04-16 Contact assembly for low current use Not-in-force EP2242070B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009018035A DE102009018035A1 (en) 2009-04-18 2009-04-18 Contact arrangement for low-voltage applications

Publications (2)

Publication Number Publication Date
EP2242070A1 EP2242070A1 (en) 2010-10-20
EP2242070B1 true EP2242070B1 (en) 2015-07-08

Family

ID=42309528

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Application Number Title Priority Date Filing Date
EP10004035A Withdrawn EP2242069A1 (en) 2009-04-18 2010-04-16 Contact assembly for low current use
EP10004094.8A Not-in-force EP2242070B1 (en) 2009-04-18 2010-04-16 Contact assembly for low current use

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP10004035A Withdrawn EP2242069A1 (en) 2009-04-18 2010-04-16 Contact assembly for low current use

Country Status (3)

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US (1) US8344276B2 (en)
EP (2) EP2242069A1 (en)
DE (1) DE102009018035A1 (en)

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1049472B (en) * 1959-01-29
US1785618A (en) * 1920-04-09 1930-12-16 Gen Railway Signal Co Copper-carbon contact
DE844197C (en) * 1941-07-18 1952-07-17 Eugen Dr-Ing Duerrwaechter Process for the production of breaker contacts from artificial carbon bodies and graphite metal bodies
US2519872A (en) * 1946-11-19 1950-08-22 Gen Electric Electrical contact composition or the like
GB933239A (en) * 1959-07-13 1963-08-08 Licentia Gmbh A drum controller for electric motors
DD242767B1 (en) * 1985-11-25 1989-10-25 Ilmenau Tech Hochschule PROCESS FOR CONNECTING SWITCH CONTACTS TO CONTACT SPERM MATERIAL
DE19503184C1 (en) * 1995-02-01 1996-05-02 Degussa Ag-based material for electrical contacts with improved erosion characteristics and resistant to welding
US5705297A (en) * 1996-03-04 1998-01-06 Bell Communications Research, Inc. Electrical connection for a polymeric laminate battery structure
JP3947307B2 (en) * 1997-06-30 2007-07-18 株式会社鷺宮製作所 Micro switch for high current
JP2004022411A (en) * 2002-06-18 2004-01-22 Mitsumi Electric Co Ltd Contact mechanism
JP2005235728A (en) * 2003-12-01 2005-09-02 Fuji Xerox Co Ltd Electrical component, electrical apparatus, and their manufacturing method
FR2877763B1 (en) * 2004-11-08 2007-03-16 Schneider Electric Ind Sas CONTACT BAG FOR A MOBILE ELECTRIC CONTACT OF A CIRCUIT BREAKER, MOBILE ELECTRICAL CONTACT HAVING SUCH A PASTILLE AND CIRCUIT BREAKER COMPRISING SUCH A CONTACT
DE202005015319U1 (en) * 2005-09-28 2006-02-02 Schunk Kohlenstofftechnik Gmbh Power switch includes two switch contact elements composed of a copper carrier having a carbon surface layer or plate containing metal
MY160057A (en) * 2009-12-11 2017-02-15 Kgt Graphit Tech Gmbh Substrate support

Also Published As

Publication number Publication date
EP2242070A1 (en) 2010-10-20
DE102009018035A1 (en) 2010-10-28
US8344276B2 (en) 2013-01-01
US20100294634A1 (en) 2010-11-25
EP2242069A1 (en) 2010-10-20

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