EP0023537A1 - Carbon brush with disconnection device - Google Patents

Carbon brush with disconnection device Download PDF

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Publication number
EP0023537A1
EP0023537A1 EP80102639A EP80102639A EP0023537A1 EP 0023537 A1 EP0023537 A1 EP 0023537A1 EP 80102639 A EP80102639 A EP 80102639A EP 80102639 A EP80102639 A EP 80102639A EP 0023537 A1 EP0023537 A1 EP 0023537A1
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EP
European Patent Office
Prior art keywords
carbon brush
metal cap
connecting piece
lifting spring
spring
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP80102639A
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German (de)
French (fr)
Inventor
Franz Wenzel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rekofa Wenzel & Co Kg GmbH
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Rekofa Wenzel & Co Kg GmbH
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 Rekofa Wenzel & Co Kg GmbH filed Critical Rekofa Wenzel & Co Kg GmbH
Publication of EP0023537A1 publication Critical patent/EP0023537A1/en
Withdrawn legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00Rotary current collectors, distributors or interrupters
    • H01R39/02Details for dynamo electric machines
    • H01R39/58Means structurally associated with the current collector for indicating condition thereof, e.g. for indicating brush wear
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00Rotary current collectors, distributors or interrupters
    • H01R39/02Details for dynamo electric machines
    • H01R39/38Brush holders
    • H01R39/40Brush holders enabling brush movement within holder during current collection

Definitions

  • the invention relates to a carbon brush with a switch-off device, which has a lifting spring with insulating nipples provided at one end facing its running surface, which is located in a bore parallel to the brush axis in the head of the carbon brush.
  • Such switch-off device n are mainly used in comparatively small electrical machines in which the carbon brushes are not observed or serviced, so that the dimensions of the carbon brushes are also comparatively small. It is known to attach switch-off devices to the heads of carbon brushes by soldering or gluing. This type of fastening has the disadvantage that the switch-off devices can be released if the brushes cannot be heated, so that. a safe shutdown is no longer guaranteed. There is also the risk that solder or adhesive will get to the lifting springs and thus jeopardize their perfect function.
  • the invention has for its object to avoid the aforementioned disadvantages to create a carbon brush with shutdown device of the type mentioned, the spring is safe and easy to attach even with very small carbon brushes and those made of very soft material and which additionally the Anbrin in a simple way supply cable.
  • the lifting spring is at its other end against the bottom of a metal cap, e.g. made of copper or brass, which is equipped with a step-shaped extension, which includes a shoulder on the head of the carbon brush.
  • the metal cap and the neck can have a cylindrical shape.
  • a connector is advantageously arranged in the stepped bottom region of the metal cap outside of the step-shaped extension, which is connected to a stranded wire which passes through an opening in the bottom of the metal cap.
  • the connector can be formed by a press ring made of copper powder. The connector is pressed into the stepped bottom area of the metal cap, so that a perfect fixing is achieved. The offset bottom area of the metal cap is extended by the thickness of the connector compared to the version without a strand. In this way it is possible even without any difficulties in connecting a power lead to the metal cap.
  • a cap made of insulating material is advantageously attached between the metal cap and the lift-off spring, which prevents current from flowing over the lift-off spring laterally over the walls of the bore to the carbon brush.
  • the metal cap is at its free edge with three or more inward claws or the like. provided, which press into the head of the carbon brush and increase the adhesive effect.
  • the lifting spring 4 of the switch-off device In the head of the carbon brush 1 there is a bore parallel to the brush axis, in which the lifting spring 4 of the switch-off device is located, which is designed as a compression spring and has an insulating nipple 5 at one end facing its running surface.
  • the other end of the lifting spring 4 is supported on the bottom of the metal cap 6, which is equipped with a step-like extension, so that its bottom area is offset.
  • the step-like extension encompasses a turned-off shoulder on the head of the carbon brush 1, the outer diameter of the shoulder on the head of the carbon brush 1 and the inner diameter of the extension of the metal cap being matched to one another in such a way that a tight fit between the shoulder and extension of the metal cap is ensured.
  • a cap 7 made of insulating material is attached, which prevents current from flowing over the lifting spring 4 laterally over the bore wall to the carbon brush.
  • the embodiment shown in FIG. 1 is a carbon brush 1 without a power lead, in which the current is supplied via the brush spring 8.
  • the brush spring 8 which is designed as a helical spring, is pushed with its one end outside over the stepped bottom region of the metal cap 6 and is supported on the outside on the step-shaped extension. Since both parts are made of highly conductive metal, the contact resistance between the brush spring 8 and the metal cap is low. The current flows from the metal cap over the head of the carbon brush to the brush running surface. Since the contact area between carbon brush 1 and metal cap 6 is comparatively large, there is also a low contact resistance here.
  • part of the lifting spring 4 protrudes beyond the head of the carbon brush 1, so that there is a relatively short installation length, with the result that only a very small part of the length of wear of the carbon brush is lost for the switch-off device.
  • Fig. 2 the carbon brush 1 is shown in the worn state, in which the lifting spring 4 has pushed the rest of the carbon brush 1 away from the collector, so that the insulating nipple 5 touches the running surface of the collector 3 and interrupts the power supply.
  • the lifting pressure can be adjusted via the depth of the hole in the head of the carbon brush 1.
  • FIGS. 3-5 show an embodiment of a carbon brush with a switch-off device, in which a connecting wire is provided.
  • the metal cap 6 is provided with a concentric bore in the bottom area.
  • the connecting lead 9 is guided through this bore.
  • the connecting wire 9 is inserted at its lower end into a connector 10 which is formed by a compact made of copper powder.
  • This connector 10 has a cylindrical shape and is firmly pressed into the bottom region of the metal cap 6. Since a connector 10 can be produced as a compact with very high strength, it is possible to press this connector very tightly into the metal cap 6, so that there is good electrical contact between the metal cap 6 and the strand 9.
  • the lifting spring 4 is located below the connector 10, the stepped bottom region of the metal cap 6 is extended by the thickness of the connector 10 compared to the version without a strand 9 according to FIGS. 1 and 2.
  • a cap 7 made of insulating material can be attached between the connecting piece 10 and the lifting spring 4.
  • Figure 4 shows the lead 9 with the connector 10 in the form of a pressed compact made of copper powder.
  • the metal cap 6 can be provided on its free edge with three or more, inwardly directed claws which press into the head of the carbon brush 1 and in this way increase the adhesion between the metal cap 6 and the carbon brush 1 .

Abstract

A carbon brush (1) with a disconnection device contains a lifting spring (4) with a dielectric nipple (5). The latter is located at the end facing the bearing surface. It should be possible to attach the spring (4) securely and easily even in the case of small carbon brushes and such brushes of very soft material. Moreover, the application of a braided current feed (9) should be possible. This is achieved in that the lifting spring (4) is supported with its other end against the base of a metal cap (6) which is fitted with a step-shaped enlargement enclosing a shoulder at the head of the carbon brush (1). In the reduced base region of the metal cap (6), a connecting piece (10) is arranged outside the step-shaped enlargement, which connecting piece (10) is connected to a braided cable (9) which passes through an opening in the base of the metal cap (6). The connecting piece (10) is formed by a copper-powder stamping and is pressed into the reduced base region of the metal cap (6). <IMAGE>

Description

Die Erfindung betrifft eine Kohlebürste mit Abschaltvorrichtung, welche eine Abhebefeder mit an ihrem einen, ihrer Lauffläche zugewandten Ende vorgesehenen Isolierstoffnippel aufweist, die sich in eine Bohrung parallel zur Bürstenachse im Kopf der Kohlebürste befindet.The invention relates to a carbon brush with a switch-off device, which has a lifting spring with insulating nipples provided at one end facing its running surface, which is located in a bore parallel to the brush axis in the head of the carbon brush.

Derartige Abschaltvorrichtungnwerden hauptsächlich bei vergleichsweise kleinen elektrischen Maschinen eingesetzt, bei denen die Kohlebürsten nicht beobachtet oder gewartet werden, so daß auch die Abmessungen der Kohlebürsten vergleichsweise gering sind. Es ist bekannt, Abschaltvorrichtungen an den Köpfen von Kohlebürsten durch Lötung oder Klebung zu befestigen. Diese Befestigungsart bringt den Nachteil mit sich, daß sich bei der nicht auszuschließenden Erwärmung der Bürsten die Abschaltvorrichtungen lösen können, so daß. ein sicherer Abschaltvorgang nicht mehr gewährleistet ist. Außerdem besteht die Gefahr, daß Löt- oder Klebemittel an die Abhebefedern gelangt und so deren einwandfreie Funktion in Frage stellen.Such switch-off device n are mainly used in comparatively small electrical machines in which the carbon brushes are not observed or serviced, so that the dimensions of the carbon brushes are also comparatively small. It is known to attach switch-off devices to the heads of carbon brushes by soldering or gluing. This type of fastening has the disadvantage that the switch-off devices can be released if the brushes cannot be heated, so that. a safe shutdown is no longer guaranteed. There is also the risk that solder or adhesive will get to the lifting springs and thus jeopardize their perfect function.

Um diese Schwierigkeiten zu beseitigen ist bereits vorgeschlagen worden, eine Metallhülse, in welcher sich die Abhebefeder befindet, in einer Bohrung im Kopf der Kohlebürste festzuklemmen. Diese Ausführung scheitert jedoch in den meisten Fällen an der vergleichsweise geringen Festigkeit des Materials der Kohlebürste. Dies gilt besonders bei sehr kleinen Abmessungen von Kohlebürsten, wenn deren Wandstärken gering sind oder auch, wenn das Material der Kohlebürsten sehr weich ist. Die gleichen Schwierigkeiten treten auf bei Befestigung mittels Stampfpulver oder Keilenstiften od.dgl. Außerdem kann nicht ausgeschlossen werden,daß bei im Betrieb auftretenden Vibrationen sich die Metallhülse in der Bohrung der Kohlebürste löst.In order to eliminate these difficulties, it has already been proposed to use a metal sleeve in which the lifting spring located in a hole in the head of the carbon brush. In most cases, however, this version fails because of the comparatively low strength of the material of the carbon brush. This applies particularly to very small dimensions of carbon brushes, if their wall thicknesses are small or if the material of the carbon brushes is very soft. The same difficulties arise when fastening by means of ramming powder or wedge pins or the like. In addition, it cannot be ruled out that the metal sleeve will come loose in the bore of the carbon brush when vibrations occur during operation.

Ein weiterer Nachteil der am meisten bekannten Ausführungen ist, daß die Abschaltvorrichtungen ine gewisse Baulänge beanspruchen. Je länger die Abschaltvorrichtung und je tiefer diese im Bürstenkopf angebracht ist, umsomehr geht der Kohlebürste an Verschleißlänge verloren. Dies wirkt sich aber gerade bei kleinen Kohlebürsten sehr nachteilig aus.Another disadvantage of the most known designs is that the shutdown devices take up a certain length. The longer the switch-off device and the deeper it is installed in the brush head, the more the carbon brush is lost in terms of wear. However, this has a very disadvantageous effect, particularly in the case of small carbon brushes.

Von diesem Stand der Technik ausgehend liegt der Erfindung die Aufgabe zugrunde, unter Vermeidung vorerwähnter Nachteile eine Kohlebürste mit Abschaltvorrichtung der eingangs genannten Art zu schaffen, deren Feder sicher und einfach auch bei ehr kleinen Kohlebürsten und solchen aus sehr weichem Material zu befestigen ist und welche zusätzlich auf einfache Art die Anbringung einer Stromzuführungslitze ermöglicht.Starting from this prior art, the invention has for its object to avoid the aforementioned disadvantages to create a carbon brush with shutdown device of the type mentioned, the spring is safe and easy to attach even with very small carbon brushes and those made of very soft material and which additionally the Anbrin in a simple way supply cable.

Gemäß der Erfindung wird dies dadurch erreicht, daß die Abhebefeder sich mit ihrem anderen Ende gegen den Boden einer Metallkappe, z.B. aus Kupfer oder Messing, abstützt, welche mit einer stufenförmigen Erweiterung ausgerüstet ist, die einen Ansatz am Kopf der Kohlebürste einschließt. Die Metallkappe und der Ansatz können zylindrische Form besitzen. Durch diese Ausführung ergibt sich eine einwandfreie Befestigung der Abschaltvorrichtung an der Kohlebürste, und zwar benötigt diese nur eine vergleichsweise kurze Einbaulänge, so daß wenig an Verschleißlänge der Kohlebürste für die Abschaltvorrichtung verlorengeht.According to the invention this is achieved in that the lifting spring is at its other end against the bottom of a metal cap, e.g. made of copper or brass, which is equipped with a step-shaped extension, which includes a shoulder on the head of the carbon brush. The metal cap and the neck can have a cylindrical shape. This design results in a perfect attachment of the switch-off device to the carbon brush, and this only requires a comparatively short installation length, so that little wear length of the carbon brush is lost for the switch-off device.

Vorteilhaft ist im abgesetzten Bodenbereich der Metallkappe außerhalb der stufenförmigen Erweiterung ein Anschlußstück angeordnet, welches mit einer Litze verbunden ist, die eine Öffnung im Boden der Metallkappe durchsetzt. Das Anschlußstück kann von einem Preßring aus Kupferpulver gebildet sein. Das Anschlußstück ist in den abgesetzten Bodenbereich der Metallkappe eingepreßt, so daß eine einwandfreie Festlegung erzielt ist. Der abgesetzte Bodenbereich der Metallkappe ist um die Stärke des Anschlußstückes gegenüber der Ausführung ohne Litze verlängert. Auf diese Weise ist es möglich, auch ohne jegliche Schwierigkeiten eine Stromzu-führungslitze an die Metallkappe anzuschließen.A connector is advantageously arranged in the stepped bottom region of the metal cap outside of the step-shaped extension, which is connected to a stranded wire which passes through an opening in the bottom of the metal cap. The connector can be formed by a press ring made of copper powder. The connector is pressed into the stepped bottom area of the metal cap, so that a perfect fixing is achieved. The offset bottom area of the metal cap is extended by the thickness of the connector compared to the version without a strand. In this way it is possible even without any difficulties in connecting a power lead to the metal cap.

Vorteilhaft ist zwischen Metallkappe und Abhebefeder eine Kappe aus Isolierstoff angebracht, welche verhindert, daß Strom über die Abhebefeder seitlich über die Wandungen der Bohrung zur Kohlebürste fließen kann.A cap made of insulating material is advantageously attached between the metal cap and the lift-off spring, which prevents current from flowing over the lift-off spring laterally over the walls of the bore to the carbon brush.

Die Metallkappe ist an ihrem freien Rand mit drei oder mehreren nach innen gerichteten Klauen od.dgl. versehen, die sich in den Kopf der Kohlebürste eindrücken und die Haftwirkung erhöhen.The metal cap is at its free edge with three or more inward claws or the like. provided, which press into the head of the carbon brush and increase the adhesive effect.

AusfÜhrungsbeispiele der Erfindung sind an Hand der Zeichnung näher erläutert, und zwar zeigt:

  • Fig. 1 eine geschnittene Ansicht einer Kohlebürste mit Abschaltvorrichtung im nichtabgeschalteten Zustand,
  • Fig. 2 die gleiche Darstellung im abgeschalteten Zustand,
  • Fig. 3 die gleiche Ansicht wie Fig. 1, jedoch mit der Stromzuführung über eine Litze,
  • Fig. 4 eine Ansicht und Draufsicht der Stromzuführungslitze und
  • Fig. 5 in schaubildlicher Darstellung die Metallkappe.
Exemplary embodiments of the invention are explained in more detail with reference to the drawing, which shows:
  • 1 is a sectional view of a carbon brush with switch-off device in the non-switched-off state,
  • 2 shows the same representation in the switched-off state,
  • 3 shows the same view as FIG. 1, but with the power supply via a strand,
  • Fig. 4 is a view and plan view of the power lead and
  • Fig. 5 in a diagrammatic representation of the metal cap.

Mit 1 ist die Kohlebürste bezeichnet, die in den Halter 2 eingesetzt ist und mit ihrer Lauffläche auf dem Kollektor 3 einer nicht weiter dargestellten elektrischen Maschine schleift.1 with the carbon brush is referred to, which is inserted into the holder 2 and one with its tread on the collector 3 is not electrical machine shown further grinds.

Im Kopf der Kohlebürste 1 ist eine Bohrung parallel zur Bürstenachse vorgesehen, in welcher sich die Abhebefeder 4 der Abschaltvorrichtung befindet, die als Druckfeder ausgebildet ist undan ihrem einen, ihrer Lauffläche zugewandten Ende einen Isolierstoffnippel 5 aufweist. Das andere Ende der Abhebefeder 4 stützt sich auf dem Boden der Metallkappe 6 ab, welche mit einer stufenförmigen Erweiterung ausgerüstet ist, so daß ihr Bodenbereich abgesetzt ist. Die stufenförmige Erweiterung umgreift einen abgedrehten Ansatz am Kopf der Kohlebürste 1, wobei der Außendurchmesser des Ansatzes am Kopf der Kohlebürste 1 und der Innendurchmesser der Erweiterung der Metallkappe derart aufeinander abgestimmt sind, daß ein fester Sitz zwischen Ansatz und Erweiterung der Metallkappe gewährleistet ist.In the head of the carbon brush 1 there is a bore parallel to the brush axis, in which the lifting spring 4 of the switch-off device is located, which is designed as a compression spring and has an insulating nipple 5 at one end facing its running surface. The other end of the lifting spring 4 is supported on the bottom of the metal cap 6, which is equipped with a step-like extension, so that its bottom area is offset. The step-like extension encompasses a turned-off shoulder on the head of the carbon brush 1, the outer diameter of the shoulder on the head of the carbon brush 1 and the inner diameter of the extension of the metal cap being matched to one another in such a way that a tight fit between the shoulder and extension of the metal cap is ensured.

Zwischen Metallkappe 6 und Abhebefeder 4 ist eine Kappe 7 aus Isolierstoff angebracht, welche verhindert, daß Strom über die Abhebefeder 4 seitlich über die Bohrungswandung zur Kohlebürste fließen kann.Between the metal cap 6 and the lifting spring 4, a cap 7 made of insulating material is attached, which prevents current from flowing over the lifting spring 4 laterally over the bore wall to the carbon brush.

Bei der in Fig. 1 dargestellten Ausführung handelt es sich um eine Kohlebürste 1 ohne eine Stromzuführungslitze, bei welcher der Strom über die BÜrstenfeder 8 zugeführt wird. Die Bürstenfeder 8, welche als Schraubenfeder ausgebildet ist, ist mit ihrem einen Ende außen über den abgesetzten Bodenbereich der Metallkappe 6 geschoben und stützt sich außen auf der stufenförmigen Erweiterung ab. Da beide Teile aus gut leitendem Metall bestehen, ist der Übergangswiderstand zwischen Bürstenfeder 8 und Metallkappe gering. Von der Metallkappe fließt der Strom über den Kopf der Kohlebürste zur Bürstenlauffläche. Da die BerÜhrungsfläche zwischen Kohlebürste 1 und Metallkappe 6 vergleichsweise groß ist, ergibt sich auch hier ein geringer Übergangswiderstand.The embodiment shown in FIG. 1 is a carbon brush 1 without a power lead, in which the current is supplied via the brush spring 8. The brush spring 8, which is designed as a helical spring, is pushed with its one end outside over the stepped bottom region of the metal cap 6 and is supported on the outside on the step-shaped extension. Since both parts are made of highly conductive metal, the contact resistance between the brush spring 8 and the metal cap is low. The current flows from the metal cap over the head of the carbon brush to the brush running surface. Since the contact area between carbon brush 1 and metal cap 6 is comparatively large, there is also a low contact resistance here.

Bedingt durch die abgesetzte Form der Metallkappe 6 ragt ein Teil der Abhebefeder 4 über den Kopf der Kohlebürste 1 hinaus, so daß sich eine relativ kurze Einbaulänge ergibt, mit der Folge, daß nur ein ganz geringer Teil an Verschleißlänge der Kohlebürste für die Abschaltvorrichtung verlorengeht.Due to the stepped shape of the metal cap 6, part of the lifting spring 4 protrudes beyond the head of the carbon brush 1, so that there is a relatively short installation length, with the result that only a very small part of the length of wear of the carbon brush is lost for the switch-off device.

In Fig. 2 ist die Kohlebürste 1 im abgenutzten Zustand gezeigt, in welchem die Abhebefeder 4 den Rest der Kohlebürste 1 vom Kollektor weggedrückt hat, so daß der Isolierstoffnippel 5 auf der Lauffläche des Kollektors 3 aufsetzt und die Stromzuführung unterbricht. Damit gewährleistet ist, daß in jedem Falle im abgenutzten Zustand der Kohlebürste 1 der Rest der Kohlebürste vom Kollektor weggedrückt wird, ist der Druck der Abhebefeder 4 höher bemessen als der Druck der Bürstenfeder 8. Der Abhebedruck kann über die Tiefe der Bohrung im Kopf der Kohlebürste 1 eingestellt werden.In Fig. 2 the carbon brush 1 is shown in the worn state, in which the lifting spring 4 has pushed the rest of the carbon brush 1 away from the collector, so that the insulating nipple 5 touches the running surface of the collector 3 and interrupts the power supply. This ensures that in any case, when the carbon brush 1 is worn, the rest of the carbon brush is pushed away from the collector, the pressure is the lift off spring 4 dimensioned higher than the pressure of the brush spring 8. The lifting pressure can be adjusted via the depth of the hole in the head of the carbon brush 1.

Die Figuren 3 - 5 zeigen eine Ausführung einer Kohlebürste mit Abschaltvorrichtung, bei welcher eine Anschlußlitze vorgesehen ist. Die Metallkappe 6 ist im Bodenbereich mit einer konzentrischen Bohrung versehen. Durch diese Bohrung ist die Anschlußlitze 9 geführt. Die Anschlußlitze 9 ist an ihrem unteren Ende in ein Anschlußstück 10 eingelassen,welches von einem Preßling aus Kupferpulver gebildet ist. Dieses Anschlußstück 10 hat eine zylindrische Form und ist fest in den Bodenbereich der Metallkappe 6 eingedrückt. Da ein Anschlußstück 10 als Preßling mit sehr hoher Festigkeit hergestellt werden kann, besteht die Möglichkeit, dieses Anschlußstück sehr stramm in die Metallkappe 6 einzupressen, so daß sich ein guter elektrischer Kontakt zwischen Metallkappe 6 und Litze 9 ergibt. Die Abhebefeder 4 befindet sich unterhalb des Anschlußstückes 10, Der abgesetzte Bodenbereich der Metallkappe 6 ist gegenüber der Ausführung ohne Litze 9 nach Fig. 1 und 2 um die Stärke des Anschlußstückes 10 verlängert. Zwischen Anschlußstück 10 und Abhebefeder 4 kann eine Kappe 7 aus Isoliermaterial angebracht sein.FIGS. 3-5 show an embodiment of a carbon brush with a switch-off device, in which a connecting wire is provided. The metal cap 6 is provided with a concentric bore in the bottom area. The connecting lead 9 is guided through this bore. The connecting wire 9 is inserted at its lower end into a connector 10 which is formed by a compact made of copper powder. This connector 10 has a cylindrical shape and is firmly pressed into the bottom region of the metal cap 6. Since a connector 10 can be produced as a compact with very high strength, it is possible to press this connector very tightly into the metal cap 6, so that there is good electrical contact between the metal cap 6 and the strand 9. The lifting spring 4 is located below the connector 10, the stepped bottom region of the metal cap 6 is extended by the thickness of the connector 10 compared to the version without a strand 9 according to FIGS. 1 and 2. A cap 7 made of insulating material can be attached between the connecting piece 10 and the lifting spring 4.

Figur 4 zeigt die Anschlußlitze 9 mit dem Anschlußstück 10 in Form eines angepreßten Preßlings aus Kupferpulver.Figure 4 shows the lead 9 with the connector 10 in the form of a pressed compact made of copper powder.

Wie aus Fig. 5 ersichtlich, kann die Metallkappe 6 an ihrem freien Rand mit drei oder mehreren, .nach innen gerichteten Klauen versehen sein, die sich in den Kopf der Kohlebürste 1 eindrücken und auf diese Weise die Haftung zwischen Metallkappe 6 und Kohlebürste 1 erhöhen.As can be seen from FIG. 5, the metal cap 6 can be provided on its free edge with three or more, inwardly directed claws which press into the head of the carbon brush 1 and in this way increase the adhesion between the metal cap 6 and the carbon brush 1 .

Claims (7)

1. Kohlebürste mit Abschaltvorrichtung, welche eine Abhebefeder mit an ihrem einen, ihrer Lauffläche zugewandten Ende vorgesehenen Isolierstoffnippel aufweist, die sich in einer Bohrung parallel zur Bürstenachse im Kopf der Kohlebürste befindet, dadurch gekennzeichnet, daß die Abhebefeder (4) sich mit ihrem anderen Ende gegen den Boden einer Metallkappe (6) abstützt, welche mit einer stufenförmigen Erweiterung ausgerüstet ist, die einen Ansatz am Kopf der Kohlebürste (1) umschließt.1. Carbon brush with switch-off device, which has a lifting spring with at its one end facing its insulating material nipple, which is located in a bore parallel to the brush axis in the head of the carbon brush, characterized in that the lifting spring (4) is at its other end against the bottom of a metal cap (6), which is equipped with a step-shaped extension, which encloses a shoulder on the head of the carbon brush (1). 2. Kohlebürste nach Anspruch 1, dadurch gekennzeichnet, daß im abgesetzten Bodenbereich der Metallkappe (6) außerhalb der stufenförmigen Erweiterung ein Anschlußstück (10) angeordnet ist, welches mit einer Litze (9) verbunden ist, die eine Öffnung im Boden der Metallkappe (6) durchsetzt.2. Carbon brush according to claim 1, characterized in that in the offset bottom region of the metal cap (6) outside the step-shaped extension, a connecting piece (10) is arranged, which is connected to a stranded wire (9) which has an opening penetration in the bottom of the metal cap (6). 3. Kohlebürste nach Anspruch 2, dadurch gekennzeichnet, daß das Anschlußstück (10) von einem Preßling aus Kupferpulver gebildet ist.3. Carbon brush according to claim 2, characterized in that the connecting piece (10) is formed by a compact made of copper powder. 4. Kohlebürste nach Anspruch 2 und/oder 3, dadurch gekennzeichnet, daß das Anschlußstück (10) in den abgesetzten Bodenbereich der Metallkappe (6) eingepreßt ist.4. Carbon brush according to claim 2 and / or 3, characterized in that the connecting piece (10) is pressed into the stepped bottom region of the metal cap (6). 5. Kohlebürste nach Anspruch 2 und/oder einem oder mehreren der folgenden, dadurch gekennzeichnet, daß der abgesetzte Bodenbereich der Metallkappe (6) um die Stärke des Anschlußstückes (10) gegenüber der Ausführung ohne Litze (9) verlängert ist.5. Carbon brush according to claim 2 and / or one or more of the following, characterized in that the stepped bottom region of the metal cap (6) by the thickness of the connecting piece (10) compared to the version without a strand (9) is extended. 6. Kohlebürste nach Anspruch 1 und/oder einem oder mehreren der folgenden, dadurch gekennzeichnet, daß zwischen Metallkappe (6) und Abhebefeder (4) eine Kappe (7) aus Isolierstoff angebracht ist.6. Carbon brush according to claim 1 and / or one or more of the following, characterized in that a cap (7) made of insulating material is attached between the metal cap (6) and lifting spring (4). 7. Kohlebürste nach Anspruch 1 und/oder einem oder mehreren der folgenden, dadurch gekennzeichnet, daß die Metallkappe (6) an ihrem freien Rand mit drei oder mehreren , nach innen gerichteten Klauen od.dgl. versehen ist.7. Carbon brush according to claim 1 and / or one or more of the following, characterized in that the metal cap (6) or the like at its free edge with three or more, inwardly directed claws. is provided.
EP80102639A 1979-07-21 1980-05-13 Carbon brush with disconnection device Withdrawn EP0023537A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE7920943U DE7920943U1 (en) 1979-07-21 1979-07-21 Carbon brush with switch-off device
DE7920943U 1979-07-21

Publications (1)

Publication Number Publication Date
EP0023537A1 true EP0023537A1 (en) 1981-02-11

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EP80102639A Withdrawn EP0023537A1 (en) 1979-07-21 1980-05-13 Carbon brush with disconnection device

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EP (1) EP0023537A1 (en)
DE (1) DE7920943U1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4536670A (en) * 1981-12-14 1985-08-20 Morganite Incorporated Electrical brushes with wear sensors
JPH0464973U (en) * 1990-10-12 1992-06-04
US5488261A (en) * 1993-05-11 1996-01-30 Schunk Kohlenstofftechnik Gmbh Carbon brush and fastening a braided indicator wire therein
EP0856384A1 (en) * 1997-01-31 1998-08-05 Robert Bosch Gmbh Handheld power tool with a detector, which gives a service signal when the carbon brushes reach a minimum length
GB2335801A (en) * 1998-03-24 1999-09-29 Bosch Gmbh Robert Commutation brush having a cutoff member supported on a flat cap
CN103181037A (en) * 2010-10-22 2013-06-26 罗伯特·博世有限公司 Carbon brush with disconnection apparatus
EP3217488A1 (en) * 2016-03-10 2017-09-13 HILTI Aktiengesellschaft Carbon brush assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4304527A1 (en) * 1993-02-15 1994-08-18 Miele & Cie Switching-off carbon brush for motors with commutators, especially for a vacuum cleaner fan motor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE621596C (en) * 1935-11-09 Siemens Schuckertwerke Akt Ges Device to prevent exceeding the permissible brush wear on collectors
DE7010521U (en) * 1970-03-21 1971-08-26 Bosch Gmbh Robert SHUT-OFF CARBON BRUSH.
DE2801839A1 (en) * 1978-01-17 1979-07-19 Bosch Gmbh Robert SHUT-OFF CARBON BRUSH

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE621596C (en) * 1935-11-09 Siemens Schuckertwerke Akt Ges Device to prevent exceeding the permissible brush wear on collectors
DE7010521U (en) * 1970-03-21 1971-08-26 Bosch Gmbh Robert SHUT-OFF CARBON BRUSH.
US3681635A (en) * 1970-03-21 1972-08-01 Bosch Gmbh Robert Carbon brush for use in electric motors
DE2801839A1 (en) * 1978-01-17 1979-07-19 Bosch Gmbh Robert SHUT-OFF CARBON BRUSH

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4536670A (en) * 1981-12-14 1985-08-20 Morganite Incorporated Electrical brushes with wear sensors
JPH0464973U (en) * 1990-10-12 1992-06-04
US5488261A (en) * 1993-05-11 1996-01-30 Schunk Kohlenstofftechnik Gmbh Carbon brush and fastening a braided indicator wire therein
EP0856384A1 (en) * 1997-01-31 1998-08-05 Robert Bosch Gmbh Handheld power tool with a detector, which gives a service signal when the carbon brushes reach a minimum length
GB2335801A (en) * 1998-03-24 1999-09-29 Bosch Gmbh Robert Commutation brush having a cutoff member supported on a flat cap
FR2776847A1 (en) * 1998-03-24 1999-10-01 Bosch Gmbh Robert MANIFOLD BROOM FOR MANIFOLD ELECTRIC MOTORS
GB2335801B (en) * 1998-03-24 2000-06-07 Bosch Gmbh Robert Commutation brush for electrical commutator machines
AT412046B (en) * 1998-03-24 2004-08-26 Bosch Gmbh Robert COMMUTING BRUSH FOR ELECTRIC COMMUTATOR MACHINES
CN103181037A (en) * 2010-10-22 2013-06-26 罗伯特·博世有限公司 Carbon brush with disconnection apparatus
US20130270963A1 (en) * 2010-10-22 2013-10-17 Robert Bosch Gmbh Carbon brush with disconnection apparatus
US9373990B2 (en) * 2010-10-22 2016-06-21 Robert Bosch Gmbh Carbon brush with disconnection apparatus
EP3217488A1 (en) * 2016-03-10 2017-09-13 HILTI Aktiengesellschaft Carbon brush assembly
WO2017153391A1 (en) * 2016-03-10 2017-09-14 Hilti Aktiengesellschaft Carbon brush arrangement

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