EP0143904A1 - Contact arrangement to electrically connect two contact fingers in coarse alignment with each other - Google Patents

Contact arrangement to electrically connect two contact fingers in coarse alignment with each other Download PDF

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Publication number
EP0143904A1
EP0143904A1 EP84110140A EP84110140A EP0143904A1 EP 0143904 A1 EP0143904 A1 EP 0143904A1 EP 84110140 A EP84110140 A EP 84110140A EP 84110140 A EP84110140 A EP 84110140A EP 0143904 A1 EP0143904 A1 EP 0143904A1
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EP
European Patent Office
Prior art keywords
contact
lamellae
fingers
lamella
points
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.)
Granted
Application number
EP84110140A
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German (de)
French (fr)
Other versions
EP0143904B1 (en
Inventor
Rainer Poth
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.)
Siemens AG
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Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0143904A1 publication Critical patent/EP0143904A1/en
Application granted granted Critical
Publication of EP0143904B1 publication Critical patent/EP0143904B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/38—Plug-and-socket contacts

Definitions

  • the invention relates to a contact device for the electrical connection of two contact fingers, which may only be roughly aligned with one another, according to the preamble of claim 1.
  • a contact device of the type mentioned in the preamble of claim 1 is already known.
  • the spring force consists of convexly curved flat springs, each of which engages in the back of a contact lamella through a recess in the ring washer, with its ends abutting the ends of the associated contact lamella and is supported with the vertex of its back on the inside of the recess in the ring washer (DE-PS 1 0 15 518).
  • annular disk is also provided, as in the contact device according to the preamble of claim 1.
  • this washer is not a separate part but is molded onto one of the contact fingers.
  • the radial spring force consists of several coil springs, each of which is bent into a circle and connected to one another at the ends (DE-PS 547 182).
  • Both known contact devices have in common that they have a cross section of their lamellae which is sufficiently large for the current carrying capacity heat up very strongly during operation. If there is insufficient heat dissipation, the heating may exceed prescribed limits. At most, an undesirably large construction volume can remedy this.
  • the object of the invention is to design the contact device for the electrical connection of two contact fingers of the type mentioned in the preamble of claim 1 in a simple manner so that their heating during operation is kept below the predetermined limit without increasing the construction volume, in particular with poor heat dissipation.
  • the object is achieved according to the invention by the training specified in the characterizing part of claim 1.
  • each contact lamella of the contact device according to the invention has three contact points, one on one lamella end and two on the other lamella end.
  • This design results in a three-point system of each contact lamella on the contact fingers, which is defined at all times, regardless of whether the contact fingers are aligned with one another or are more or less offset from one another.
  • the three contact points per contact lamella also result in three current transition points between each contact lamella and the contact fingers instead two current transfer points in the prior art. Since the current can now be distributed over a larger number of current transition points during operation, the proportion of electricity that each current transition point has to transmit is correspondingly lower and thus both the partial and the total heating are lower.
  • 1 denotes a contact finger made of round material.
  • the reference symbol 2 applies to a contact finger that is the same as the contact finger 1.
  • a contact device 3 is provided for electrically connecting the contact fingers 1 and 2, which, contrary to the drawing, can also only be roughly aligned with one another.
  • the contact device 3 has an annular disk 4 (FIG. 1) and a ring of contact lamellae 5, which have an approximately square cross section (FIG. 2).
  • Each of the contact blades 5 is bent out approximately in a barrel shape.
  • the apex of the bend is in the middle of the contact lamellae 5.
  • the barrel-shaped bend is followed by an opposite bend.
  • the contact lamellae 5 are encompassed by two coil springs 6 each bent into a ring, the ends of which are each connected to one another.
  • the coil springs 6 are located in the throats of the oppositely directed bends following the barrel-shaped bends of the contact lamellae 5.
  • the contact blades 5 are held with the coil springs 6 in engagement with the washer 4 and are expandable against the force of the coil springs 6 by the contact fingers 1, 2.
  • Each of the contact blades 5 has three contact points at which a current transfer takes place between the contact blades 5 and the contact fingers 1, 2 during operation of the contact device 3.
  • One of the contact points is arranged at one end of each contact lamella 5, while the other two contact points are located at the other end of each contact lamella.
  • the contact blades 5 are arranged offset by 18o 0 in such a way that each end of a contact blade 5 with a contact point is adjacent to a contact blade end with two contact points. This means that on both contact fingers 1, 2, a contact plate end with two contact points follows each contact plate end with one contact point (FIG. 2).
  • each contact lamella 5 is grooved at one end on its side facing the associated contact finger 1 or 2.
  • the radius of the groove is smaller than half the diameter of the corresponding contact finger 1 or 2 (Fig. 2).
  • the ends of the contact lamellae 5 each having only one contact point can be designed in two ways in the example shown. They either have flat surfaces that can be tangentially attached to the assigned contact fingers 1 or 2 or are also grooved. In this case, however, the groove is such that its radius is larger than half the diameter of the respective contact fingers 1 or 2.
  • the contact lamellae 5 can also be provided at one end with a knob forming the single contact point and at the other end with two knobs forming the double contact point.

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  • Contacts (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)

Abstract

1. Contact device for the electrical connection of two contact fingers (1, 2), possibly only approximately in alignment with each other, having an annular disc (4) and a ring of contact lamellae (5) arranged round the annular disc (4), which lamellae have a rectangular cross section and are held with radial spring force (6) in engagement with the annular disc (4), and can be spread apart against spring force (6) by the contact fingers (1, 2), characterised in that the contact lamellae (5) have respectively three contact points, one at one end of the lamella and two at the other end of the lamella, and in that the contact lamellae (5) are arranged to be offset with respect to each other so that adjacent to each end of a contact lamella (5) with one contact point there is one end of a contact lamella (5) with two contact points.

Description

Die Erfindung bezieht sich auf eine Kontaktvorrichtung zum elektrischen Verbinden zweier gegebenenfalls nur grob miteinander fluchtender Kontaktfinger nach dem Oberbegriff des Anspruches 1.The invention relates to a contact device for the electrical connection of two contact fingers, which may only be roughly aligned with one another, according to the preamble of claim 1.

Es ist bereits eine Kontaktvorrichtung der im Oberbegriff des Anspruches 1 genannten Art bekannt. Die Federkraft besteht hierbei aus konvex gebogenen Flachfedern, die jeweils im Rücken einer Kontaktlamelle eine Ausnehmung der Ringscheibe durchgreifen, mit ihren Enden an den Enden der zugeordneten Kontaktlamelle anliegen und sich mit dem Scheitel ihres Rückens an der Innenseite der Ausnehmung der Ringscheibe abstützen (DE-PS 10 15 518).A contact device of the type mentioned in the preamble of claim 1 is already known. The spring force consists of convexly curved flat springs, each of which engages in the back of a contact lamella through a recess in the ring washer, with its ends abutting the ends of the associated contact lamella and is supported with the vertex of its back on the inside of the recess in the ring washer (DE-PS 1 0 15 518).

Bei einer weiteren bekannten Kontaktvorrichtung ist zwar auch, wie bei der Kontaktvorrichtung nach dem Oberbegriff des Anspruches 1, eine Ringscheibe vorgesehen. Diese Ringscheibe ist jedoch kein separates Teil sondern an einen der Kontaktfinger angeformt. Ferner besteht die radiale Federkraft aus mehreren Schraubenfedern, die jeweils zu einem Kreis gebogenen und an den Enden miteinander verbunden sind (DE-PS 547 182).In a further known contact device, an annular disk is also provided, as in the contact device according to the preamble of claim 1. However, this washer is not a separate part but is molded onto one of the contact fingers. Furthermore, the radial spring force consists of several coil springs, each of which is bent into a circle and connected to one another at the ends (DE-PS 547 182).

Beiden bekannten Kontaktvorrichtungen ist gemeinsam, daß sie sich auch bei einem für die Stromtragfähigkeit genügend großen Querschnitt ihrer Lamellen im Betrieb noch sehr stark erwärmen. Bei ungenügender Wärmeabfuhr kann die Erwärmung vorgeschriebene Grenzen überschreiten. Allenfalls ein unerwünscht großes Bauvolumen kann hier Abhilfe schaffen.Both known contact devices have in common that they have a cross section of their lamellae which is sufficiently large for the current carrying capacity heat up very strongly during operation. If there is insufficient heat dissipation, the heating may exceed prescribed limits. At most, an undesirably large construction volume can remedy this.

Aufgabe der Erfindung ist es, die Kontaktvorrichtung zum elektrischen Verbinden zweier gegebenenfalls nur grob miteinander fluchtender Kontaktfinger der im Oberbegriff des Anspruches 1 genannten Gattung auf einfache Weise so auszubilden, daß sich ihre Erwärmung im Betrieb ohne Vergrößerung des Bauvolumens unterhalb der vorgegebenen Grenze hält, insbesondere bei mangelhafter Wärmeabfuhr.The object of the invention is to design the contact device for the electrical connection of two contact fingers of the type mentioned in the preamble of claim 1 in a simple manner so that their heating during operation is kept below the predetermined limit without increasing the construction volume, in particular with poor heat dissipation.

Die gestellte Aufgabe wird erfindungsgemäß durch die im kennzeichnenden Teil des Anspruches 1 angegebene Ausbildung gelöst.The object is achieved according to the invention by the training specified in the characterizing part of claim 1.

Zweckmäßige Weiterbildungen des Erfindungsgegenstandes sind in den Ansprüchen 2 bis 4 angegeben.Appropriate developments of the subject matter of the invention are specified in claims 2 to 4.

Bei den bekannten Kontaktvorrichtungen sind pro Kontaktlamelle nur zwei Kontaktstellen vorhanden, je eine an jedem Lamellenende. Dagegen besitzt jede-Kontaktlamelle der erfindungsgemäßen Kontaktvorrichtung drei Kontaktstellen, eine an einem Lamellenende und zwei am anderen Lamellenende. Durch diese Ausbildung ergibt sich eine jederzeit definierte Dreipunktanlage jeder Kontaktlamelle an den Kontaktfingern, unabhängig davon, ob die Kontaktfinger miteinander fluchten oder gegeneinander mehr oder minder versetzt sind. Durch die drei Kontaktstellen pro Kontaktlamelle ergeben sich aber auch drei Stromübergangsstellen zwischen je - der Kontaktlamelle und den Kontaktfingern, anstelle zweier Stromübergangsstellen beim Stande der Technik. Da sich im Betrieb der Strom nun auf eine größere Anzahl von Stromübergangsstellen verteilen kann, ist der Stromanteil, den jede Stromübergangsstelle zu übertragen hat, entsprechend geringer und damit sowohl die partielle als auch die Gesamterwärmung niedriger.In the known contact devices, there are only two contact points per contact lamella, one at each lamella end. In contrast, each contact lamella of the contact device according to the invention has three contact points, one on one lamella end and two on the other lamella end. This design results in a three-point system of each contact lamella on the contact fingers, which is defined at all times, regardless of whether the contact fingers are aligned with one another or are more or less offset from one another. The three contact points per contact lamella also result in three current transition points between each contact lamella and the contact fingers instead two current transfer points in the prior art. Since the current can now be distributed over a larger number of current transition points during operation, the proportion of electricity that each current transition point has to transmit is correspondingly lower and thus both the partial and the total heating are lower.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung rein schematisch dargestellt. Es zeigen:

  • Fig. 1 einen Aufriß im Schnitt,
  • Fig. 2 eine Draufsicht nach Fig. 1.
An embodiment of the invention is shown purely schematically in the drawing. Show it:
  • 1 is an elevation in section,
  • 2 is a plan view of FIG .. 1

In der Zeichnung ist mit 1 ein aus Rundmaterial bestehender Kontaktfinger bezeichnet. Das Bezugszeichen 2 gilt für einen dem Kontaktfiger 1 gleichen Kontaktfinger.In the drawing, 1 denotes a contact finger made of round material. The reference symbol 2 applies to a contact finger that is the same as the contact finger 1.

Zum elektrischen Verbinden der Kontaktfinger 1 und 2, die entgegen der Zeichnung gegebenenfalls auch nur grob miteinander fluchten können, ist eine Kontaktvorrichtung 3 vorgesehen.A contact device 3 is provided for electrically connecting the contact fingers 1 and 2, which, contrary to the drawing, can also only be roughly aligned with one another.

Die Kontaktvorrichtung 3 weist eine Ringscheibe 4 (Fig.1) und einen Kranz von Kontaktlamellen 5 auf, die einen etwa viereckigen Querschnitt besitzen (Fig.2).The contact device 3 has an annular disk 4 (FIG. 1) and a ring of contact lamellae 5, which have an approximately square cross section (FIG. 2).

Jeder der Kontaktlamellen 5 ist etwa tonnenförmig ausgebogen. Der Scheitel der Ausbiegung ist in der Mitte der Kontaktlamellen 5. Gegen jedes Ende der Kontaktlamellen 5 schließt sich an die tonnenförmige Ausbiegung eine entgegengesetzt gerichtete Abbiegung an.Each of the contact blades 5 is bent out approximately in a barrel shape. The apex of the bend is in the middle of the contact lamellae 5. Towards each end of the contact lamellae 5, the barrel-shaped bend is followed by an opposite bend.

Die Kontaktlamellen 5 sind von zwei jeweils zu einem Ring gebogenen Schraubenfedern 6 umgriffen, deren Enden jeweils miteinander verbunden sind. Die Schraubenfedern 6 liegen in den Kehlen der sich an die tonnenförmigen Ausbiegungen der Kontaktlamellen 5 anschließenden entgegengesetzt gerichteten Abbiegungen.The contact lamellae 5 are encompassed by two coil springs 6 each bent into a ring, the ends of which are each connected to one another. The coil springs 6 are located in the throats of the oppositely directed bends following the barrel-shaped bends of the contact lamellae 5.

Die Kontaktlamellen 5 werden mit den Schraubenfedern 6 im Eingriff mit der Ringscheibe 4 gehalten und sind entgegen der Kraft der Schraubenfedern 6 durch die Kontaktfinger 1,2 spreizbar.The contact blades 5 are held with the coil springs 6 in engagement with the washer 4 and are expandable against the force of the coil springs 6 by the contact fingers 1, 2.

Jede der Kontaktlamellen 5 besitzt drei Kontaktstellen, an denen im Betrieb der Kontaktvorrichtung 3 ein Stromübergang zwischen den Kontaktlamellen 5 und den Kontaktfingern 1,2 erfolgt. Eine der Kontaktstellen ist jeweils an einem Ende jeder Kontaktlamelle 5 angeordnet, während sich die beiden anderen Kontaktstellen am anderen Ende jeder Kontaktlamelle befinden.Each of the contact blades 5 has three contact points at which a current transfer takes place between the contact blades 5 and the contact fingers 1, 2 during operation of the contact device 3. One of the contact points is arranged at one end of each contact lamella 5, while the other two contact points are located at the other end of each contact lamella.

Die Kontaktlamellen 5 sind in der Weise um 18o0 versetzt angeordnet, daß jedem Ende einer Kontaktlamelle 5 mit einer Kontaktstelle ein Kontaktlamellenende mit zwei Kontaktstellen benachbart ist. Das bedeutet, daß an beiden Kontaktfingern 1,2 jeweils auf ein Kontaktlamellenende mit einer Kontaktstelle ein Kontaktlamellenende mit zwei Kontaktstellen folgt (Fig.2).The contact blades 5 are arranged offset by 18o 0 in such a way that each end of a contact blade 5 with a contact point is adjacent to a contact blade end with two contact points. This means that on both contact fingers 1, 2, a contact plate end with two contact points follows each contact plate end with one contact point (FIG. 2).

Zur Bildung der doppelten Kontaktstellen ist jede Kontaktlamelle 5 an ihrer dem zugeordneten Kontaktfinger 1 oder 2 zugewandten Seite an einem Ende ausgekehlt. Der Radius der Auskehlung ist kleiner als der halbe Durchmesser des entsprechenden Kontaktfingers 1 beziehungsweise 2 (Fig.2).To form the double contact points, each contact lamella 5 is grooved at one end on its side facing the associated contact finger 1 or 2. The radius of the groove is smaller than half the diameter of the corresponding contact finger 1 or 2 (Fig. 2).

Die nur jeweils eine Kontaktstelle aufweisenden Enden der Kontaktlamellen 5 können im dargestellten Beispiel auf zweierlei Weise ausgebildet sein. Sie besitzen entweder an die zugeordneten Kontaktfinger 1 oder 2 tangential anlegbare ebene Flächen oder sind ebenfalls ausgekehlt. Die Auskehlung ist in diesem Falle jedoch so, daß ihr Radius größer als der halbe Durchmesser der jeweiligen Kontaktfingers 1 oder 2 ist.The ends of the contact lamellae 5 each having only one contact point can be designed in two ways in the example shown. They either have flat surfaces that can be tangentially attached to the assigned contact fingers 1 or 2 or are also grooved. In this case, however, the groove is such that its radius is larger than half the diameter of the respective contact fingers 1 or 2.

In nicht dargestellter Weise können beispielsweise die Kontaktlamellen 5 auch an einem Ende mit einer die einzelne Kontaktstelle bildenden Noppe und am anderen Ende mit zwei, die doppelte Kontaktstelle bildenden Noppen versehen sein.In a manner not shown, for example, the contact lamellae 5 can also be provided at one end with a knob forming the single contact point and at the other end with two knobs forming the double contact point.

Claims (4)

1. Kontaktvorrichtung zum elektrischen Verbinden zweier gegebenenfalls nur grob miteinander fluchtender Kontaktfinger (1,2), mit einer Ringscheibe (4) und einem um die Ringscheibe (4) angeordneten Kranz von Kontaktlamellen (5), die einen viereckigen Querschnitt besitzen sowie mit radialer Federkraft (6) im Eingriff mit der Ringscheibe (4) gehalten und gegen die Federkraft (6) durch die Kontaktfinger (1,2) spreizbar sind, dadurch gekennzeichnet, daß die Kontaktlamellen (5) jeweils drei Kontaktstellen aufweisen, eine an einem Lamellenende und zwei am anderen Lamellenende und daß die Kontaktlamellen (5) so gegeneinander versetzt angeordnet sind, daß jedem Ende einer Kontaktlamelle (5) mit einer Kontaktstelle ein Ende einer Kontaktlamelle (5) mit zwei Kontaktstellen benachbart ist.1. Contact device for electrically connecting two contact fingers (1, 2), which are only roughly aligned with one another, with an annular disk (4) and a ring of contact lamellae (5) arranged around the annular disk (4), which have a square cross-section and with radial spring force (6) held in engagement with the annular disc (4) and expandable against the spring force (6) by the contact fingers (1, 2), characterized in that the contact blades (5) each have three contact points, one at one end of the blade and two at the other end of the lamellae and that the contact lamellae (5) are arranged so that they are offset from one another such that each end of a contact lamella (5) with a contact point is adjacent to one end of a contact lamella (5) with two contact points. 2. Kontaktvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die den Kontaktfingern (1,2) zugewandten Seiten der Kontaktlamellen (5) zur Bildung der doppelten Kontaktstellen jeweils an einem Ende ausgekehlt sind und daß der Radius der Auskehlung kleiner als der halbe Durchmesser des zugeordneten Kontaktfingers (1 oder 2) ist.2. Contact device according to claim 1, characterized in that the contact fingers (1,2) facing sides of the contact lamellae (5) are formed at one end to form the double contact points and that the radius of the groove is smaller than half the diameter of the associated Contact finger (1 or 2). 3. Kontaktvorrichtung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die den Kontaktfingern (1,2) zugewandten Seiten der Kontaktlamellen (5) an dem nur eine Kontaktstelle aufweisenden Ende eine tangential an den zugeordneten Kontaktfinger ( 1 oder 2) anlegbare ebene Fläche aufweisen.3. Contact device according to claim 1 and 2, characterized in that the sides of the contact blades (5) facing the contact fingers (1, 2) have, at the end having only one contact point, a flat surface which can be applied tangentially to the associated contact fingers (1 or 2) . 4. Kontaktvorrichtung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die den Kontaktfingern (1,2) zugewandten Seiten der Kontaktlamellen (5) an den nur eine Kontaktstelle aufweisenden Enden ebenfalls ausgekehlt sind und der Radius der Auskehlung größer als der halbe Durchmesser des zugeordneten Kontaktfingers (1 oder 2) ist.4. Contact device according to claim 1 and 2, characterized in that the contact fingers (1,2) facing sides of the contact lamellae (5) are also grooved at the ends having only one contact point and the radius of the groove is greater than half the diameter of the associated Contact finger (1 or 2).
EP84110140A 1983-09-06 1984-08-24 Contact arrangement to electrically connect two contact fingers in coarse alignment with each other Expired EP0143904B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3332141 1983-09-06
DE19833332141 DE3332141A1 (en) 1983-09-06 1983-09-06 CONTACT DEVICE FOR ELECTRICALLY CONNECTING TWO, IF NECESSARY, ONLY ROUGHLY FLOWING CONTACT FINGERS

Publications (2)

Publication Number Publication Date
EP0143904A1 true EP0143904A1 (en) 1985-06-12
EP0143904B1 EP0143904B1 (en) 1986-11-05

Family

ID=6208373

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84110140A Expired EP0143904B1 (en) 1983-09-06 1984-08-24 Contact arrangement to electrically connect two contact fingers in coarse alignment with each other

Country Status (7)

Country Link
EP (1) EP0143904B1 (en)
AU (1) AU3272484A (en)
BR (1) BR8404435A (en)
DE (2) DE3332141A1 (en)
GR (1) GR81977B (en)
IN (1) IN159388B (en)
ZA (1) ZA846953B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5025121A (en) * 1988-12-19 1991-06-18 Siemens Energy & Automation, Inc. Circuit breaker contact assembly

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2376818A (en) * 1943-01-06 1945-05-22 Westinghouse Electric & Mfg Co Disconnecting contact
DE1015518B (en) * 1953-10-09 1957-09-12 Bbc Brown Boveri & Cie Contact device
DE1125999B (en) * 1960-04-25 1962-03-22 Licentia Gmbh Switching contact for circuit breaker
DE1134446B (en) * 1961-05-16 1962-08-09 Sachsenwerk Licht & Kraft Ag Contact device for electrical switchgear
US3064226A (en) * 1959-09-28 1962-11-13 Fred H Cole Vibration resistant connector
US3127492A (en) * 1961-05-29 1964-03-31 Mc Graw Edison Co Electric contact assemblage of contact fingers in which helically wound conductive members provide contact pressure
CH474876A (en) * 1968-11-05 1969-06-30 Bbc Brown Boveri & Cie Electrical contact arrangement

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2376818A (en) * 1943-01-06 1945-05-22 Westinghouse Electric & Mfg Co Disconnecting contact
DE1015518B (en) * 1953-10-09 1957-09-12 Bbc Brown Boveri & Cie Contact device
US3064226A (en) * 1959-09-28 1962-11-13 Fred H Cole Vibration resistant connector
DE1125999B (en) * 1960-04-25 1962-03-22 Licentia Gmbh Switching contact for circuit breaker
DE1134446B (en) * 1961-05-16 1962-08-09 Sachsenwerk Licht & Kraft Ag Contact device for electrical switchgear
US3127492A (en) * 1961-05-29 1964-03-31 Mc Graw Edison Co Electric contact assemblage of contact fingers in which helically wound conductive members provide contact pressure
CH474876A (en) * 1968-11-05 1969-06-30 Bbc Brown Boveri & Cie Electrical contact arrangement

Also Published As

Publication number Publication date
AU3272484A (en) 1985-03-14
IN159388B (en) 1987-05-09
EP0143904B1 (en) 1986-11-05
DE3332141A1 (en) 1985-03-21
BR8404435A (en) 1985-08-20
ZA846953B (en) 1985-04-24
GR81977B (en) 1984-12-12
DE3461234D1 (en) 1986-12-11

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