EP0297985A1 - Contact lever for electrical switch apparatus - Google Patents

Contact lever for electrical switch apparatus Download PDF

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Publication number
EP0297985A1
EP0297985A1 EP88401681A EP88401681A EP0297985A1 EP 0297985 A1 EP0297985 A1 EP 0297985A1 EP 88401681 A EP88401681 A EP 88401681A EP 88401681 A EP88401681 A EP 88401681A EP 0297985 A1 EP0297985 A1 EP 0297985A1
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EP
European Patent Office
Prior art keywords
contact
structural
piece
contact lever
lever
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.)
Ceased
Application number
EP88401681A
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German (de)
French (fr)
Inventor
Luc Moreau
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.)
Telemecanique SA
Original Assignee
La Telemecanique Electrique SA
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 La Telemecanique Electrique SA filed Critical La Telemecanique Electrique SA
Publication of EP0297985A1 publication Critical patent/EP0297985A1/en
Ceased 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
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5822—Flexible connections between movable contact and terminal

Definitions

  • the present invention relates to a contact lever for an electrical switch device, more particularly for a low voltage cut-off device.
  • Such contact levers are generally made of copper and have a contact zone intended to cooperate with a fixed contact of the apparatus, while the permanent electrical connection of the contact zone with a terminal of the apparatus is ensured by means of '' a flexible link such as a braid welded at one point of the lever.
  • a flexible link such as a braid welded at one point of the lever.
  • the object of the present invention is to lower the cost price of a contact lever for an electrical switch device while ensuring good electrical conduction properties and, where appropriate, arc resistance.
  • the contact lever is constituted by a structural piece of material with low electrical conductivity connected to a terminal of the device via a flexible conductive link and it comprises, to cooperate with a fixed contact of the device, a contact piece of material with good electrical conductivity attached to the structural piece;
  • the structural part is a thin part delimited by two parallel lateral faces and by a slice;
  • the contact piece has a fixing cheek applicable on a first lateral face of the structural part and a contact pad applicable on the edge of the structural part, while the flexible conductive link is fixed on a second lateral face of the structural part substantially opposite a part of the cheek for fixing the contact piece.
  • the current path in the structural part - preferably steel - is thus minimized and the electrical losses are reduced.
  • the contact piece is preferably made of copper.
  • the cheek for fixing the contact piece and the flexible conductive connection - preferably a braid - are advantageously welded on either side of the steel piece. This has good rigidity and can be simply cut, while presenting towards its free end located in the vicinity of the copper contact piece an arc horn.
  • the contact lever 10 illustrated is incorporated into an electrical protection switch device S.
  • This low-voltage type device is a disconnector-circuit breaker, but may also be a circuit breaker, comprising for each pole such a contact lever.
  • the lever 10 consists of a steel part 11 on which is welded a copper piece 12 having according to the invention a fixing cheek 13 and a contact pad 14.
  • the lever 10 is intended to pivot around an axis 0 so that the contact pad can be applied to a fixed contact part 15 electrically connected to a terminal 16 of the device and can separate from said part 15 respectively.
  • the connection between the fixed contact 15 and terminal 16 is illustrated in dashes and the contacts are shown closed in FIG. 1.
  • the lever 10 pivots in the direction of the arrow F under the effect of an automatic or manual command to open the contacts.
  • a flexible copper braid 17 is used to electrically connect the lever 10 to a terminal 18 of the device; the braid 17 is for this purpose welded, on the one hand, to the lever 10 and, on the other hand, to a part 19 for connection to the terminal 18.
  • the volume of the steel part 11 of the lever is defined by two parallel lateral faces 20, 21 and a section 22 (FIG. 2).
  • the fixing cheek 13 of the contact lever is welded in a place 23 of the face 20 of the lever near one end of the latter, while the contact pad 14 is applied to the edge 22 of the lever.
  • the braid 17 is welded on a surface 24 of the face 21 substantially facing a part of the cheek 13.
  • the part 12 is provided with pins 25 which facilitate the electrical welding of its cheek 13 on the steel part 11.
  • a notch 28 is provided in the copper part 12 between the cheek 13 and the shoe 14 (see FIGS. 4 and 5) in the vicinity of an adjoining part 29 of the steel part 11, so as to impose on the current I which passes in the contact lever 10 a path close to the outer face 30 of the part 12.
  • the current I in the contact lever 10 flows (FIG. 1) from the terminal 18 in the connection piece 19 and the braid 17, then passes through the thickness of the part 11 of the lever from face 21 to face 20 thereof, that is to say perpendicular to said faces (see FIG. 2), and travels in the welding cheek 13 towards the contact zone of the shoe 14 passing near the face 30 and under the notch 28 to pass to the fixed contact 15.
  • an arc horn 27 is provided at a free end 26 of the contact lever 10, on the side of the copper piece 12 opposite the central zone of the lever.
  • the magnetic field created by the circulation of the current I on this side 'notch 28 to the point of contact of the shoe 14 is channeled by the steel part 29; consequently, the foot of the arch is blown from the shoe 14 towards the horn 27.
  • the wear due to the arch is therefore exerted on the horn 27 and not on the copper piece 12. It follows that the piece copper can be made thinner, which facilitates its manufacture by cutting and folding.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)

Abstract

Contact lever composed of a structural member (11) made of steel for example, and of a contact member (12) made of copper for example. The contact member (12) possesses a fastening flange (13) which can be applied to a first side face (20) of the structural member and a contact shoe (14) which can be applied to the segment (22) of the structural member. A flexible conductive link such as a braid (17) is fastened onto a second side face (21) of the structural member, substantially opposite the flange (13). <IMAGE>

Description

La présente invention concerne un levier de contact pour appareil électrique interrupteur, plus particulièrement pour appareil de coupure en basse tension.The present invention relates to a contact lever for an electrical switch device, more particularly for a low voltage cut-off device.

De tels leviers de contact sont généralement en cuivre et présentent une zone de contact destinée à coopérer avec un contact fixe de l'appareil, tandis que la liaison électrique permanente de la zone de contact avec une borne de l'appa­reil est assurée au moyen d'une liaison souple telle qu'une tresse soudée en un point du levier. Quand le levier de contact est en position de fermeture, le courant électrique parcourt donc la tresse et la partie du levier comprise entre le point de soudage de la tresse et la zone de contact.Such contact levers are generally made of copper and have a contact zone intended to cooperate with a fixed contact of the apparatus, while the permanent electrical connection of the contact zone with a terminal of the apparatus is ensured by means of '' a flexible link such as a braid welded at one point of the lever. When the contact lever is in the closed position, the electric current therefore flows through the braid and the part of the lever between the welding point of the braid and the contact zone.

La réalisation du levier en cuivre matricé est relativement onéreuse.The production of the stamped copper lever is relatively expensive.

Pour diminuer le prix de revient d'un pont de contact dans un contacteur, il est connu de réaliser ce levier en acier et de lui rapporter au moins dans la zone de contact une pièce de contact dans un matériau meilleur conducteur. Cette solution reste toutefois médiocre sur le plan de la conduc­tion électrique en raison de la faible conductibilité élec­trique de l'acier.To reduce the cost price of a contact bridge in a contactor, it is known to make this steel lever and to bring it at least in the contact area a contact piece in a better conductive material. However, this solution remains poor in terms of electrical conduction due to the low electrical conductivity of the steel.

La présente invention a pour but d'abaisser le prix de revient d'un levier de contact pour appareil électrique interrupteur tout en assurant de bonnes propriétés électri­ques de conduction et, le cas échéant, de tenue à l'arc.The object of the present invention is to lower the cost price of a contact lever for an electrical switch device while ensuring good electrical conduction properties and, where appropriate, arc resistance.

Selon l'invention, le levier de contact est constitué par une pièce structurelle en matériau à faible conductibilité électrique reliée à une borne de l'appareil par l'intermé­diaire d'une liaison conductrice souple et il comporte, pour coopérer avec un contact fixe de l'appareil, une pièce de contact en matériau à bonne conductibilité électrique rapportée sur la pièce structurelle ; la pièce structurelle est une pièce mince délimitée par deux faces latérales parallèles et par une tranche ; la pièce de contact présente une joue de fixation applicable sur une première face laté­rale de la pièce structurelle et un patin de contact appli­cable sur la tranche de la pièce structurelle, tandis que la liaison conductrice souple est fixée sur une deuxième face latérale de la pièce structurelle sensiblement en regard d'une partie de la joue de fixation de la pièce de contact.According to the invention, the contact lever is constituted by a structural piece of material with low electrical conductivity connected to a terminal of the device via a flexible conductive link and it comprises, to cooperate with a fixed contact of the device, a contact piece of material with good electrical conductivity attached to the structural piece; the structural part is a thin part delimited by two parallel lateral faces and by a slice; the contact piece has a fixing cheek applicable on a first lateral face of the structural part and a contact pad applicable on the edge of the structural part, while the flexible conductive link is fixed on a second lateral face of the structural part substantially opposite a part of the cheek for fixing the contact piece.

Le chemin de courant dans la pièce structurelle - de préfé­rence en acier - est ainsi minimisé et les pertes électri­ques sont réduites. La pièce de contact est de préférence en cuivre. La joue de fixation de la pièce de contact et la liaison conductrice souple - de préférence une tresse - sont avantageusement soudées de part et d'autre de la pièce en acier. Celle-ci présente une bonne rigidité et peut être simplement découpée, tout en présentant vers son extrémité libre située au voisinage de la pièce de contact en cuivre une corne d'arc.The current path in the structural part - preferably steel - is thus minimized and the electrical losses are reduced. The contact piece is preferably made of copper. The cheek for fixing the contact piece and the flexible conductive connection - preferably a braid - are advantageously welded on either side of the steel piece. This has good rigidity and can be simply cut, while presenting towards its free end located in the vicinity of the copper contact piece an arc horn.

Un mode de réalisation non limitatif de l'invention est décrit ci-après en regard des dessins.

  • La figure 1 représente schématiquement un appareil électrique interrupteur de protection équipé du levier de contact composite conforme à l'invention ;
  • La figure 2 est une vue du levier de contact selon la flèche A de la figure 1 ;
  • Les figures 3 et 4 sont des vues latérales d'une partie du levier de contact respectivement selon les flèches B et C de la figure 2 ;
  • La figure 5 montre en perspective la pièce de contact en cuivre.
A nonlimiting embodiment of the invention is described below with reference to the drawings.
  • FIG. 1 schematically represents an electrical protection switch device equipped with the composite contact lever according to the invention;
  • Figure 2 is a view of the contact lever according to arrow A in Figure 1;
  • Figures 3 and 4 are side views of part of the contact lever respectively according to arrows B and C of Figure 2;
  • Figure 5 shows in perspective the copper contact piece.

Le levier de contact 10 illustré est incorporé à un appareil électrique interrupteur de protection S. Cet appareil du type basse tension est un sectionneur-disjoncteur, mais peut aussi bien être un disjoncteur, comprenant pour chaque pôle un tel levier de contact. Le levier 10 se compose d'une partie en acier 11 sur laquelle est soudée une pièce en cuivre 12 présentant selon l'invention une joue de fixation 13 et un patin de contact 14. Le levier 10 est destiné à pivoter autour d'un axe 0 pour que le patin de contact puisse s'appliquer sur une pièce de contact fixe 15 électri­quement reliée à une borne 16 de l'appareil et puisse respectivement se séparer de ladite pièce 15. La liaison entre le contact fixe 15 et la borne 16 est illustrée en tirets et les contacts sont représentés fermés sur la figure 1. Le levier 10 pivote dans le sens de la flèche F sous l'effet d'une commande automatique ou manuelle pour ouvrir les contacts. Une tresse souple en cuivre 17 sert à relier électriquement le levier 10 à une borne 18 de l'appareil ; la tresse 17 est à cet effet soudée, d'une part, au levier 10 et, d'autre part, à une pièce 19 de connexion à la borne 18.The contact lever 10 illustrated is incorporated into an electrical protection switch device S. This low-voltage type device is a disconnector-circuit breaker, but may also be a circuit breaker, comprising for each pole such a contact lever. The lever 10 consists of a steel part 11 on which is welded a copper piece 12 having according to the invention a fixing cheek 13 and a contact pad 14. The lever 10 is intended to pivot around an axis 0 so that the contact pad can be applied to a fixed contact part 15 electrically connected to a terminal 16 of the device and can separate from said part 15 respectively. The connection between the fixed contact 15 and terminal 16 is illustrated in dashes and the contacts are shown closed in FIG. 1. The lever 10 pivots in the direction of the arrow F under the effect of an automatic or manual command to open the contacts. A flexible copper braid 17 is used to electrically connect the lever 10 to a terminal 18 of the device; the braid 17 is for this purpose welded, on the one hand, to the lever 10 and, on the other hand, to a part 19 for connection to the terminal 18.

Plus en détail, le volume de la partie 11 en acier du levier est défini par deux faces latérales parallèles 20, 21 et une tranche 22 (figure 2). La joue de fixation 13 du levier de contact est soudée sur une place 23 de la face 20 du levier près d'une extrémité de celui-ci, tandis que le patin de contact 14 est appliqué sur la tranche 22 du levier. La tresse 17 est soudée sur une plage 24 de la face 21 sensi­blement en regard d'une partie de la joue 13. La pièce 12 est dotée de picots 25 qui facilitent le soudage électrique de sa joue 13 sur la partie 11 en acier.In more detail, the volume of the steel part 11 of the lever is defined by two parallel lateral faces 20, 21 and a section 22 (FIG. 2). The fixing cheek 13 of the contact lever is welded in a place 23 of the face 20 of the lever near one end of the latter, while the contact pad 14 is applied to the edge 22 of the lever. The braid 17 is welded on a surface 24 of the face 21 substantially facing a part of the cheek 13. The part 12 is provided with pins 25 which facilitate the electrical welding of its cheek 13 on the steel part 11.

Une échancrure 28 est prévue dans la pièce en cuivre 12 entre la joue 13 et le patin 14 (voir figures 4 et 5) au voisinage d'une partie contiguë 29 de la pièce en acier 11, de manière à imposer au courant I qui passe dans le levier de contact 10 un cheminement proche de la face extérieure 30 de la pièce 12.A notch 28 is provided in the copper part 12 between the cheek 13 and the shoe 14 (see FIGS. 4 and 5) in the vicinity of an adjoining part 29 of the steel part 11, so as to impose on the current I which passes in the contact lever 10 a path close to the outer face 30 of the part 12.

Quand l'appareil interrupteur 10 est fermé, le courant I dans le levier de contact 10 circule (figure 1) à partir de la borne 18 dans la pièce de connexion 19 et la tresse 17, puis traverse l'épaisseur de la partie 11 du levier de la face 21 à la face 20 de celui-ci, c'est-à-dire perpendicu­lairement auxdites faces (voir figure 2), et chemine dans la joue de soudage 13 vers la zone de contact du patin 14 en passant près de la face 30 et sous l'échancrure 28 pour passer au contact fixe 15.When the switching device 10 is closed, the current I in the contact lever 10 flows (FIG. 1) from the terminal 18 in the connection piece 19 and the braid 17, then passes through the thickness of the part 11 of the lever from face 21 to face 20 thereof, that is to say perpendicular to said faces (see FIG. 2), and travels in the welding cheek 13 towards the contact zone of the shoe 14 passing near the face 30 and under the notch 28 to pass to the fixed contact 15.

A une extrémité libre 26 du levier de contact 10, du côté de la pièce en cuivre 12 opposé à la zone médiane du levier, il est prévu une corne d'arc 27. Le champ magnétique créé par la circulation du courant I en deçà l'échancrure 28 vers le point de contact du patin 14 est canalisé par la partie en acier 29 ; en conséquence, le pied de l'arc est soufflé du patin 14 vers la corne 27. L'usure due à l'arc s'exerce donc sur la corne 27 et non sur la pièce en cuivre 12. Il en résulte que la pièce en cuivre peut être réalisée plus mince, ce qui facilite sa fabrication par découpe et pliage.At a free end 26 of the contact lever 10, on the side of the copper piece 12 opposite the central zone of the lever, an arc horn 27 is provided. The magnetic field created by the circulation of the current I on this side 'notch 28 to the point of contact of the shoe 14 is channeled by the steel part 29; consequently, the foot of the arch is blown from the shoe 14 towards the horn 27. The wear due to the arch is therefore exerted on the horn 27 and not on the copper piece 12. It follows that the piece copper can be made thinner, which facilitates its manufacture by cutting and folding.

Claims (6)

1. Levier de contact pour appareil électrique inter­rupteur, constitué par une pièce structurelle (11) en matériau à faible conductibilité électrique reliée à une borne de l'appareil (S) par l'intermédiaire d'une liaison conductrice souple (17) et comportant, pour coopérer avec un contact fixe (15) de l'appareil, une pièce de contact (12) en matériau à bonne conductibilité électrique rapportée sur la pièce structurelle,
caractérisé par le fait que :
- la pièce structurelle (11) est une pièce mince délimitée par deux faces latérales parallèles et une tranche,
- la pièce de contact (12) présente une joue de fixation (13) applicable sur une première face latérale (20) de la pièce structurelle (11) et un patin de contact (14) appli­cable sur la tranche (22) de la pièce structurelle,
- la liaison conductrice souple (17) est fixée sur une deuxième face latérale (21) de la pièce structurelle sensiblement en regard d'une partie de la joue de fixation (13) de la pièce de contact.1. Contact lever for electrical switch device, consisting of a structural part (11) of material with low electrical conductivity connected to a terminal of the device (S) via a flexible conductive link (17) and comprising to cooperate with a fixed contact (15) of the device, a contact part (12) made of material with good electrical conductivity attached to the structural part,
characterized by the fact that:
the structural part (11) is a thin part delimited by two parallel lateral faces and a slice,
- The contact piece (12) has a fixing cheek (13) applicable on a first lateral face (20) of the structural part (11) and a contact pad (14) applicable on the edge (22) of the part structural,
- The flexible conductive link (17) is fixed on a second lateral face (21) of the structural part substantially facing a part of the fixing cheek (13) of the contact part. 2. Levier de contact selon la revendication 1,
caractérisé par le fait que la pièce structurelle (11) est en acier, la pièce de contact (12) est en cuivre et la joue de fixation (13) de la pièce de contact est soudée sur la première face latérale (20), la liaison conductrice souple (17) étant une tresse en cuivre soudée sur la deuxième face latérale (21) de la pièce en acier (11).2. Contact lever according to claim 1,
characterized in that the structural part (11) is made of steel, the contact part (12) is made of copper and the fixing cheek (13) of the contact part is welded to the first lateral face (20), the flexible conductive link (17) being a copper braid welded to the second lateral face (21) of the steel part (11). 3. Levier de contact selon la revendication 2,
caractérisé par le fait que la joue de fixation (13) de la pièce de contact (12) est munie de picots de soudage (25).3. Contact lever according to claim 2,
characterized in that the fixing cheek (13) of the contact piece (12) is provided with welding pins (25). 4. Levier de contact selon l'une des revendications 1 à 3,
caractérisé par le fait que la pièce structurelle (11) est découpée et que la pièce de contact (12) est découpée et pliée.4. Contact lever according to one of claims 1 to 3,
characterized by the fact that the structural part (11) is cut and that the contact part (12) is cut and folded. 5. Levier de contact selon l'une des revendications 1 à 4,
caractérisé par le fait que la pièce structurelle (11) présente à une extrémité libre (26) et au voisinage de la pièce de contact (12) une corne d'arc (27).5. Contact lever according to one of claims 1 to 4,
characterized in that the structural part (11) has at a free end (26) and in the vicinity of the contact part (12) an arc horn (27). 6. Levier de contact selon la revendication 5,
caractérisé par le fait que la pièce de contact (12) com­prend entre la joue de fixation (13) et le patin de contact (14) une échancrure (28) située au voisinage d'une partie (29) de la pièce en acier (11), de manière à imposer au courant (I) un cheminement proche d'une face extérieure (30) de la pièce de contact.6. Contact lever according to claim 5,
characterized in that the contact piece (12) comprises between the fixing cheek (13) and the contact pad (14) a notch (28) located in the vicinity of a part (29) of the steel piece ( 11), so as to impose on the current (I) a path close to an external face (30) of the contact part.
EP88401681A 1987-07-01 1988-06-30 Contact lever for electrical switch apparatus Ceased EP0297985A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8709290A FR2617632A1 (en) 1987-07-01 1987-07-01 CONTACT LEVER FOR ELECTRICAL DEVICE SWITCH
FR8709290 1987-07-01

Publications (1)

Publication Number Publication Date
EP0297985A1 true EP0297985A1 (en) 1989-01-04

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ID=9352734

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Application Number Title Priority Date Filing Date
EP88401681A Ceased EP0297985A1 (en) 1987-07-01 1988-06-30 Contact lever for electrical switch apparatus

Country Status (2)

Country Link
EP (1) EP0297985A1 (en)
FR (1) FR2617632A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0467798A1 (en) * 1990-07-19 1992-01-22 Merlin Gerin Process for making a welded connection between a flexible conductor and a contact finger, and contact finger

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1665958A1 (en) * 1967-06-12 1971-04-08 Siemens Ag Heavy-duty contact arrangement
US3930211A (en) * 1974-11-25 1975-12-30 Caribe Circuit Breaker Co Inc Circuit breaker
US4339642A (en) * 1981-01-19 1982-07-13 General Electric Company Current switching member for circuit breakers
EP0167668A1 (en) * 1984-05-09 1986-01-15 Siemens Aktiengesellschaft Contact arrangement for a relay with a high interrupting capacity

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1665958A1 (en) * 1967-06-12 1971-04-08 Siemens Ag Heavy-duty contact arrangement
US3930211A (en) * 1974-11-25 1975-12-30 Caribe Circuit Breaker Co Inc Circuit breaker
US4339642A (en) * 1981-01-19 1982-07-13 General Electric Company Current switching member for circuit breakers
EP0167668A1 (en) * 1984-05-09 1986-01-15 Siemens Aktiengesellschaft Contact arrangement for a relay with a high interrupting capacity

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0467798A1 (en) * 1990-07-19 1992-01-22 Merlin Gerin Process for making a welded connection between a flexible conductor and a contact finger, and contact finger
FR2665026A1 (en) * 1990-07-19 1992-01-24 Merlin Gerin METHOD FOR WELDING CONNECTION OF A FLEXIBLE CONDUCTOR TO A CONTACT FINGER, AND ELECTRICAL CONTACT STRUCTURE WITH MULTIPLE BLADES.
US5163221A (en) * 1990-07-19 1992-11-17 Merlin Gerin Method of welding a flexible conductor to a contact finger

Also Published As

Publication number Publication date
FR2617632A1 (en) 1989-01-06

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