EP0516533B1 - Manufacturing process of a socket-contact and socket-contact so obtained - Google Patents

Manufacturing process of a socket-contact and socket-contact so obtained Download PDF

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Publication number
EP0516533B1
EP0516533B1 EP92401444A EP92401444A EP0516533B1 EP 0516533 B1 EP0516533 B1 EP 0516533B1 EP 92401444 A EP92401444 A EP 92401444A EP 92401444 A EP92401444 A EP 92401444A EP 0516533 B1 EP0516533 B1 EP 0516533B1
Authority
EP
European Patent Office
Prior art keywords
block
blank
slots
diameter
good
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.)
Expired - Lifetime
Application number
EP92401444A
Other languages
German (de)
French (fr)
Other versions
EP0516533A1 (en
Inventor
Henri Organi
Roger Sauvat
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.)
Alstom Holdings SA
Original Assignee
GEC Alsthom 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 GEC Alsthom SA filed Critical GEC Alsthom SA
Publication of EP0516533A1 publication Critical patent/EP0516533A1/en
Application granted granted Critical
Publication of EP0516533B1 publication Critical patent/EP0516533B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
    • B30B15/022—Moulds for compacting material in powder, granular of pasta form
    • B30B15/024—Moulds for compacting material in powder, granular of pasta form using elastic mould parts
    • 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
    • H01H1/385—Contact arrangements for high voltage gas blast circuit breakers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts

Definitions

  • the present invention relates to a method of manufacturing a contact socket, usable for equipping electrical devices such as circuit breakers and disconnectors.
  • contact tulips is carried out in the following known manner: one starts from a metal tube which is a good conductor of electricity and has good elasticity properties, for example copper with chromium.
  • the tube is fitted at one end with a cupro-tungsten crown which will be used to form the contact fingers. This crown is produced by electronic bombardment or by brazing.
  • Parallel longitudinal slots are made in the crown and on part of the tube so as to constitute contact fingers.
  • the most economical current method for making these slots is to make milling passes; by this method, slits with a width of less than 1.2 mm cannot be produced; or the use of contact tulips in gas blast circuit breakers requires that the width of the slots is of the order of 0.2 mm to allow good compression of the blowing gas.
  • An object of the invention is to define a process which makes it possible to carry out the operation of shrinking the end of the tube without altering the qualities of the metal.
  • the method is carried out by means of a press comprising a fixed sheath provided with a cylindrical recess to receive the elastomer block and a bore for the establishment of a piece for centering the blank, and a movable upper block to which said cylindrical core is fixed, the upper block being associated with means for receiving a pressure which is communicated, by means of a support washer, to the block of elastomeric material.
  • a shim is disposed between the sheath and the movable block to limit the stroke of the movable block.
  • the elastomeric material of the core can advantageously be that sold under the brand ELADIP and the reference E 420 and which has a Shore A hardness of 81.
  • the reference 1 designates a blank intended for the making of a contact tulip.
  • the blank consists of a tube having one end provided with grooves 2 intended for fixing it in the electrical appliance.
  • the other portion of the tube is thinned and provided with a crown 3, and with longitudinal parallel slots, as has been explained above.
  • the sheath also comprises at its lower part, a bore allowing the fixing of a part 6 for centering the blank; this centering piece is fixed to the sheath by screws 7.
  • the press is completed by a metal upper block 8, preferably made of steel, comprising an axial bore 9 partially threaded into which is screwed a core 10 engaging, with a given clearance, inside the blank 1.
  • a means not shown allows to exert, on the upper face of the block 8 a pressure which is communicated, thanks to a support washer 11, to the elastomer block. This deforms and causes a shrinkage of the blank at the slots which tighten as desired.
  • the material chosen to produce the deformable block is advantageously an elastomer marketed under the brand ELADIP and whose shore A hardness is 81.
  • the force exerted on the upper block is 50 tonnes.

Abstract

Process for manufacturing a socket-contact from a rough mould consisting of a tube of material with good conductive properties and good elasticity comprising a narrowed portion provided with longitudinal parallel slots and terminated by a ring of material having good electrical conductivity and good resistance to the effects of electric arcing, characterised in that it comprises the following operations:   - the said rough mould (1) is placed around a cylindrical core (10) having a diameter substantially equal to the diameter of the rough mould and a length equal to that of the rough mould, the top of the core abutting against the ring,   - a block (5) made of an elastomer and of annular cross-section having an adjoining internal diameter slightly greater than the external diameter of the rough mould and a height substantially equal to that of the slots is arranged around the rough mould in line with the slots,   - a pressure is exerted on the end surfaces of the said block, tending to reduce the internal diameter of the said block until the desired slot width is obtained. <IMAGE>

Description

La présente invention est relative à un procédé de fabrication d'une tulipe de contacts, utilisable pour l'équipement d'appareils électriques tels que disjoncteurs et sectionneurs.The present invention relates to a method of manufacturing a contact socket, usable for equipping electrical devices such as circuit breakers and disconnectors.

La fabrication des tulipes de contacts s'effectue de la manière connue suivante: on part d'un tube en métal bon conducteur de l'électricité et à bonnes propriétés d'élasticité, par exemple un cuivre au chrome. On munit le tube, à une de ses extrémités, d'une couronne en cupro-tungstène qui servira à l'élaboration des doigts de contact. Cette couronne est réalisée par bombardement électronique ou par brasage.The production of contact tulips is carried out in the following known manner: one starts from a metal tube which is a good conductor of electricity and has good elasticity properties, for example copper with chromium. The tube is fitted at one end with a cupro-tungsten crown which will be used to form the contact fingers. This crown is produced by electronic bombardment or by brazing.

On pratique dans la couronne et sur une partie du tube des fentes longitudinales parallèles de manière à constituer des doigts de contact. La méthode actuelle la plus économique pour réaliser ces fentes est d'effectuer des passes de fraisage; par cette méthode, on ne peut pas réaliser des fentes de largeur inférieure à 1,2 mm; or l'emploi des tulipes de contact dans les disjoncteurs à soufflage de gaz nécessite que la largeur des fentes soit de l'ordre de 0,2 mm pour permettre une bonne compression du gaz de soufflage. On pourrait envisager de réaliser les doigts par un usinage avec fil, mais cette méthode, si elle permet de réaliser des largeurs de fente de la finesse désirée, a le grave inconvénient d'être longue et onéreuse. On est donc conduit à partir du tube à fentes larges et à pratiquer une opération d'écrasage au tour jusqu'à obtention des valeurs de largeur de fentes souhaitées. Cette dernière opération a le défaut d'écrouir le métal qui perd une partie de ses qualités de résistance et d'élasticité.Parallel longitudinal slots are made in the crown and on part of the tube so as to constitute contact fingers. The most economical current method for making these slots is to make milling passes; by this method, slits with a width of less than 1.2 mm cannot be produced; or the use of contact tulips in gas blast circuit breakers requires that the width of the slots is of the order of 0.2 mm to allow good compression of the blowing gas. One could consider making the fingers by machining with wire, but this method, if it makes it possible to produce slit widths of the desired fineness, has the serious drawback of being long and expensive. We are therefore led from the wide-slit tube and to perform a lathe crushing operation until the desired slit width values are obtained. This last operation has the defect of hardening the metal which loses part of its qualities of resistance and elasticity.

Un but de l'invention est de définir un procédé qui permette de réaliser l'opération de rétreint de l'extrémité du tube sans altérer les qualités du métal.An object of the invention is to define a process which makes it possible to carry out the operation of shrinking the end of the tube without altering the qualities of the metal.

L'invention a ainsi pour objet un procédé pour la fabrication d'une tulipe de contacts à partir d'une ébauche constituée par un tube en matériau à bonnes propriétés conductrices et à bonne élasticité comprenant une portion amincie munie de fentes parallèles longitudinales et terminée par une couronne en matériau ayant une bonne conductibilité électrique et une bonne résistance aux effets de l'arc électrique, caractérisé en ce qu'il comprend les opérations suivantes:

  • on place ladite ébauche autour d'un noyau cylindrique ayant un diamètre sensiblement égal au diamètre de l'ébauche et une longueur égale à celle de l'ébauche, le sommet du noyau butant sur la couronne,
  • on dispose autour de l'ébauche et au droit des fentes un bloc de section annulaire ayant un diamètre intérieur voisin un peu supérieur au diamètre extérieur de l'ébauche et une hauteur sensiblement égale à celle des fentes, le bloc étant réalisé en un matériau élastomère,
  • on exerce sur les surfaces d'extrémités dudit bloc une pression tendant à réduire le diamètre intérieur dudit bloc jusqu'à obtention de la largeur de fente désirée.
The subject of the invention is therefore a method for manufacturing a contact tulip from a blank constituted by a tube of material with good conductive properties and good elasticity comprising a thinned portion provided with longitudinal parallel slots and terminated by a ring of material having good electrical conductivity and good resistance to the effects of the electric arc, characterized in that it comprises the following operations:
  • said blank is placed around a cylindrical core having a diameter substantially equal to the diameter of the blank and a length equal to that of the blank, the top of the core abutting on the crown,
  • there is arranged around the blank and in line with the slots an annular section block having an internal diameter close to slightly greater than the outside diameter of the blank and a height substantially equal to that of the slots, the block being made of an elastomeric material ,
  • pressure is exerted on the end surfaces of said block tending to reduce the inside diameter of said block until the desired slit width is obtained.

Avantageusement, le procédé est réalisé au moyen d'une presse comprenant un fourreau fixe muni d'un évidement cylindrique pour recevoir le bloc élastomère et d'un alésage pour la mise en place d'une pièce de centrage de l'ébauche, et un bloc supérieur mobile auquel est fixé ledit noyau cylindrique, le bloc supérieur étant associé à des moyens pour recevoir une pression qui est communiquée, par l'intermédiaire d'une rondelle d'appui, au bloc en matériau élastomère.Advantageously, the method is carried out by means of a press comprising a fixed sheath provided with a cylindrical recess to receive the elastomer block and a bore for the establishment of a piece for centering the blank, and a movable upper block to which said cylindrical core is fixed, the upper block being associated with means for receiving a pressure which is communicated, by means of a support washer, to the block of elastomeric material.

Avantageusement, une cale est disposée entre le fourreau et le bloc mobile pour limiter la course du bloc mobile.Advantageously, a shim is disposed between the sheath and the movable block to limit the stroke of the movable block.

Le matériau élastomère du noyau peut avantageusement être celui commercialisé sous la marque ELADIP et la référence E 420 et qui a une dureté Shore A de 81.The elastomeric material of the core can advantageously be that sold under the brand ELADIP and the reference E 420 and which has a Shore A hardness of 81.

L'invention sera bien comprise par la description donnée ci-après d'un exemple de réalisation de la presse pour la mise en oeuvre du procédé, en référence au dessin annexé dans lequel:

  • la figure 1 est une vue en élévation en coupe de la presse, représentée avant rétreint du tube,
  • la figure 2 est une vue analogue, après l'opération de rétreint.
The invention will be better understood from the description given below of an exemplary embodiment of the press for implementing the method, with reference to the appended drawing in which:
  • FIG. 1 is a sectional elevation view of the press, shown before the tube is constricted,
  • Figure 2 is a similar view, after the necking operation.

Dans la figure 1, la référence 1 désigne une ébauche destinée à la confection d'une tulipe de contacts. L'ébauche est constitué d'un tube ayant une extrémité munie de cannelures 2 destinées à sa fixation dans l'appareil électrique. L'autre portion du tube est amincie et munie d'une couronne 3, et de fentes parallèles longitudinales, comme il a été expliqué plus haut.In FIG. 1, the reference 1 designates a blank intended for the making of a contact tulip. The blank consists of a tube having one end provided with grooves 2 intended for fixing it in the electrical appliance. The other portion of the tube is thinned and provided with a crown 3, and with longitudinal parallel slots, as has been explained above.

La presse permettant de réduire la largeur de l'espace entre les fentes comprend un fourreau 4, de préférence en acier, ayant un évidement central pour recevoir le bloc annulaire en élastomère 5. Le fourreau comprend aussi à sa partie inférieure, un alésage permettant la fixation d'une pièce 6 pour le centrage de l'ébauche; cette pièce de centrage est fixée au fourreau par des vis 7.The press making it possible to reduce the width of the space between the slots comprises a sheath 4, preferably made of steel, having a central recess for receiving the annular block of elastomer 5. The sheath also comprises at its lower part, a bore allowing the fixing of a part 6 for centering the blank; this centering piece is fixed to the sheath by screws 7.

La presse est complétée par un bloc supérieur métallique 8, de préférence en acier, comportant un alésage axial 9 partiellement fileté dans lequel est vissé un noyau 10 s'engageant, avec un jeu donné, à l'intérieur de l'ébauche 1. Un moyen non représenté permet d'exercer, sur la face supérieure du bloc 8 une pression qui se communique, grâce à une rondelle d'appui 11, au bloc en élastomère. Celui-ci se déforme et entraîne un rétreint de l'ébauche au niveau des fentes qui se resserrent comme il est souhaité. Une cale annulaire 12, de préférence en acier, permet de limiter la course du bloc supérieur 8 pour atteindre la précision désirée.The press is completed by a metal upper block 8, preferably made of steel, comprising an axial bore 9 partially threaded into which is screwed a core 10 engaging, with a given clearance, inside the blank 1. A means not shown allows to exert, on the upper face of the block 8 a pressure which is communicated, thanks to a support washer 11, to the elastomer block. This deforms and causes a shrinkage of the blank at the slots which tighten as desired. An annular shim 12, preferably made of steel, makes it possible to limit the travel of the upper block 8 to achieve the desired precision.

Le matériau choisi pour réaliser le bloc déformable est avantageusement un élastomère commercialisé sous la marque ELADIP et dont la dureté shore A est de 81.The material chosen to produce the deformable block is advantageously an elastomer marketed under the brand ELADIP and whose shore A hardness is 81.

A titre d'exemple, pour la réalisation d'une tulipe de diamètre égal à 35mm, la force exercée sur le bloc supérieur est de 50 tonnes.For example, for the production of a tulip with a diameter equal to 35mm, the force exerted on the upper block is 50 tonnes.

Bien entendu, l'invention n'est pas limité à l'emploi du matériau précité ni à celui de la presse décrite, qui n'ont été donnés qu'à titre d'exemple nullement limitatif.Of course, the invention is not limited to the use of the aforementioned material or to that of the press described, which have been given only by way of non-limiting example.

Claims (4)

  1. A method of manufacturing a thimble of contact fingers from a blank constituted by a tube of material having good conductive properties and good elasticity, the tube including a thin-walled portion provided with longitudinal parallel slots and terminated by a ring of material having good electrical conductivity and that is good at withstanding the effects of electrical arcing, the method being characterized in that it comprises the following operations:
       the said blank (1) is placed around a cylindrical core (10) of diameter substantially equal to the diameter of the blank and of length equal to the length of the blank, the end of the core coming into abutment against the ring;
       an annular section block (5) is disposed around the blank over the slots, the inside diameter of the block being close to and slightly greater than the outside diameter of the blank and the axial length of the block being substantially equal to the axial length of the slots, the block being made of an elastomer material; and
       pressure is exerted on the end surfaces of said block, thereby tending to reduce the inside diameter of said block until the desired slot width is obtained.
  2. A method according to claim 1, characterized in that it is performed by means of a press comprising a fixed sheath (4) provided with a cylindrical recess for receiving the elastomer block (5) and a bore for receiving a centering part (6) for centering the blank (1), and a moving top block (8) to which said cylindrical core (9) is fixed, the top block being associated with means for receiving pressure which is communicated via a thrust washer (11) to the block of elastomer material (5).
  3. A method according to claim 2, characterized in that a spacer (12) is disposed between the sheath (4) and the moving block (8) to limit the stroke of the moving block.
  4. A method according to any one of claims 1 to 3, characterized in that the elastomer material of the block (5) is the material sold under the trademark Eladip and the reference E 420, having a hardness of 81 on the Shore A scale.
EP92401444A 1991-05-30 1992-05-26 Manufacturing process of a socket-contact and socket-contact so obtained Expired - Lifetime EP0516533B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9106522A FR2677166B1 (en) 1991-05-30 1991-05-30 METHOD OF MANUFACTURING A CONTACT TULIP AND CONTACT TULIP CARRIED OUT ACCORDING TO THE METHOD.
FR9106522 1991-05-30

Publications (2)

Publication Number Publication Date
EP0516533A1 EP0516533A1 (en) 1992-12-02
EP0516533B1 true EP0516533B1 (en) 1995-08-09

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EP92401444A Expired - Lifetime EP0516533B1 (en) 1991-05-30 1992-05-26 Manufacturing process of a socket-contact and socket-contact so obtained

Country Status (10)

Country Link
US (1) US5201207A (en)
EP (1) EP0516533B1 (en)
JP (1) JPH07111851B2 (en)
CN (1) CN1030673C (en)
AT (1) ATE126387T1 (en)
CA (1) CA2069801C (en)
DE (1) DE69203965T2 (en)
DK (1) DK0516533T3 (en)
ES (1) ES2075646T3 (en)
FR (1) FR2677166B1 (en)

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US7716349B1 (en) 1992-12-09 2010-05-11 Discovery Communications, Inc. Electronic book library/bookstore system
US7835989B1 (en) 1992-12-09 2010-11-16 Discovery Communications, Inc. Electronic book alternative delivery systems
US7849393B1 (en) 1992-12-09 2010-12-07 Discovery Communications, Inc. Electronic book connection to world watch live
US7861166B1 (en) 1993-12-02 2010-12-28 Discovery Patent Holding, Llc Resizing document pages to fit available hardware screens
US7865405B2 (en) 1992-12-09 2011-01-04 Discovery Patent Holdings, Llc Electronic book having electronic commerce features
US7865567B1 (en) 1993-12-02 2011-01-04 Discovery Patent Holdings, Llc Virtual on-demand electronic book
US8073695B1 (en) 1992-12-09 2011-12-06 Adrea, LLC Electronic book with voice emulation features
US8095949B1 (en) 1993-12-02 2012-01-10 Adrea, LLC Electronic book with restricted access features
US9053640B1 (en) 1993-12-02 2015-06-09 Adrea, LLC Interactive electronic book

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DE4309678A1 (en) * 1993-03-25 1994-09-29 Stade Umformtechnik Gmbh Device and method for deforming stainless steel membranes for vacuum thermal insulation elements
DE19516830A1 (en) * 1995-05-08 1996-11-14 Veritas Gummiwerke Ag Pressing tools and methods for connecting tubular elements
US8062012B2 (en) * 2007-06-05 2011-11-22 Metaldyne, Llc Elastomeric seal sizer
CN104162614B (en) * 2014-07-07 2016-03-02 河南科技大学 A kind of switch fingertip part shaping techniques and mated forming die thereof
CN107633976B (en) * 2016-07-19 2019-12-06 闫淼江 High-voltage isolating switch, fracture assembly thereof and method for manufacturing female contact

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US2375574A (en) * 1942-12-30 1945-05-08 Cons Aireraft Corp Apparatus for fabricating connecting rods
FR1133961A (en) * 1954-06-22 1957-04-04 Production Tool Alloy Company Improvements in processes for obtaining shaped articles from powders
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7716349B1 (en) 1992-12-09 2010-05-11 Discovery Communications, Inc. Electronic book library/bookstore system
US7835989B1 (en) 1992-12-09 2010-11-16 Discovery Communications, Inc. Electronic book alternative delivery systems
US7849393B1 (en) 1992-12-09 2010-12-07 Discovery Communications, Inc. Electronic book connection to world watch live
US7865405B2 (en) 1992-12-09 2011-01-04 Discovery Patent Holdings, Llc Electronic book having electronic commerce features
US8073695B1 (en) 1992-12-09 2011-12-06 Adrea, LLC Electronic book with voice emulation features
US7861166B1 (en) 1993-12-02 2010-12-28 Discovery Patent Holding, Llc Resizing document pages to fit available hardware screens
US7865567B1 (en) 1993-12-02 2011-01-04 Discovery Patent Holdings, Llc Virtual on-demand electronic book
US8095949B1 (en) 1993-12-02 2012-01-10 Adrea, LLC Electronic book with restricted access features
US9053640B1 (en) 1993-12-02 2015-06-09 Adrea, LLC Interactive electronic book
US8548813B2 (en) 1999-06-25 2013-10-01 Adrea, LLC Electronic book with voice emulation features
US9099097B2 (en) 1999-06-25 2015-08-04 Adrea, LLC Electronic book with voice emulation features

Also Published As

Publication number Publication date
ES2075646T3 (en) 1995-10-01
EP0516533A1 (en) 1992-12-02
CN1069362A (en) 1993-02-24
ATE126387T1 (en) 1995-08-15
DE69203965D1 (en) 1995-09-14
JPH05198229A (en) 1993-08-06
FR2677166B1 (en) 1993-08-06
DE69203965T2 (en) 1995-12-21
US5201207A (en) 1993-04-13
CN1030673C (en) 1996-01-10
JPH07111851B2 (en) 1995-11-29
CA2069801C (en) 1995-01-03
DK0516533T3 (en) 1995-09-25
FR2677166A1 (en) 1992-12-04

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