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EP2487755B1 - Vis de serrage - Google Patents

Vis de serrage Download PDF

Info

Publication number
EP2487755B1
EP2487755B1 EP11305125.4A EP11305125A EP2487755B1 EP 2487755 B1 EP2487755 B1 EP 2487755B1 EP 11305125 A EP11305125 A EP 11305125A EP 2487755 B1 EP2487755 B1 EP 2487755B1
Authority
EP
European Patent Office
Prior art keywords
clamping screw
actuating member
contact part
breaking point
contact
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.)
Not-in-force
Application number
EP11305125.4A
Other languages
German (de)
English (en)
Other versions
EP2487755A1 (fr
Inventor
Volker Markgraf
Gert Dr. Stauch
Manfred Baesch
Jürgen KRAUSS
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.)
Nexans SA
Original Assignee
Nexans 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 Nexans SA filed Critical Nexans SA
Priority to EP11305125.4A priority Critical patent/EP2487755B1/fr
Priority to PL11305125T priority patent/PL2487755T3/pl
Priority to AU2012200645A priority patent/AU2012200645A1/en
Priority to RU2012104230/07A priority patent/RU2495519C1/ru
Priority to BR102012002802A priority patent/BR102012002802A2/pt
Priority to CN201210027588.0A priority patent/CN102637966B/zh
Publication of EP2487755A1 publication Critical patent/EP2487755A1/fr
Application granted granted Critical
Publication of EP2487755B1 publication Critical patent/EP2487755B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/36—Conductive members located under tip of screw

Definitions

  • the invention relates to a clamping screw for fastening an electrical conductor in a designed as a piece of pipe clamp made of metal, which has in its wall at least one threaded through hole for receiving the clamping screw, which has at least one predetermined breaking point for limiting the force in its construction which is exerted thereon by means of a tool acting on the clamping screw and causing it to rotate about its axis ( EP 0750723 B1 ).
  • Such, also referred to as “tear-off screw” or “shear screw” clamping screw - hereinafter referred to as “screw” - is used, for example, in power engineering for connecting the electrical conductors of two power cables.
  • screw screw
  • screw screw
  • screw screw
  • screw screw
  • the screw can be equipped as a shear screw with at least one predetermined breaking point, which is arranged in its axial course as a circumferential groove.
  • the upper part of the screw is sheared off when the strength of its predetermined breaking point is reached or exceeded.
  • the missing screw head is an indication that the screw is sufficient is firmly tightened.
  • the screw protrudes after shearing off the screw head not or only slightly out of the clamp out.
  • An insulating element to be mounted above the same is therefore neither mechanically damaged nor impaired in its insulating properties.
  • the predetermined breaking point interrupts the thread of the screw, so that its load capacity is weakened.
  • the screw according to the above-mentioned EP 0 750 723 B1 has in its course a plurality of trained as circumferential grooves predetermined breaking points, which are arranged parallel to each other and at an axial distance in the threaded portion of the screw.
  • the screw is also equipped with a central blind hole with a polygonal cross section, which lies close to the predetermined breaking point closest to the screw tip.
  • a rotary body is provided, which consists of a predetermine in the blind hole pin with a polygonal cross-section and the same by far surrounding a surrounding hood on which the pin is attached and the outside has a hex nut for applying a tool.
  • this screw can only be used for the setting of conductors with predetermined dimensions, if it is to be prevented that parts of the sheared screw disturbing protrude from the terminal.
  • the invention has for its object to make the initially described screw so that it is suitable without limiting its carrying capacity for setting located in a terminal conductors with any dimensions.
  • the contact part which is the actual screw for fixing a conductor in a terminal, while the operating part is to be regarded only as an aid with which the contact member is brought into its end position in which a conductor is fixed in a clamp.
  • the contact part has only one of the shearing serving predetermined breaking point, whose position in the course of the contact part is almost arbitrary and in particular independent of the diameter of a conductor to be determined in a terminal.
  • the predetermined breaking point need only be far enough away from the contact surface of the contact part, so that after the shearing of the upper part of the same remains a sufficient length, on which the lower part of the actuating part can be rotated.
  • the contact member is continuously rotated by means of an attacking on the upper part of the screwed actuator operating tool in the threaded hole of a terminal until its contact surface is located on a located in the terminal, having any diameter conductor and is pressed with a predetermined force against the same.
  • the upper part of the contact part is sheared off. It is basically irrelevant how long the remaining part of the contact part is and how far the same protrudes from the terminal, as long as the lower part of the operating part can remain rotatably on the same.
  • This part of the contact part is finally torn off by the lower part of the operating part, as soon as it rests on the clamp and is further rotated by means of the tool.
  • the actuating part is made in one piece, with a lying between the upper part and the lower part, circumferential predetermined breaking point. But it can also consist of two separate from one another mecanical in the contact part parts, one of which is again a shell and the other is a lower part.
  • the contact part of the screw consists of a sufficiently strong, preferably highly electrically conductive metal, such as brass or an aluminum alloy.
  • the operating part of the screw may for example consist of steel. It also takes into account the one-piece embodiment of the fastening part, also representative of the above-mentioned two-part embodiment.
  • Fig. 1 is an existing example of a tinned aluminum alloy, designed as a pipe piece terminal 1 shown. It has two threaded holes, in each of which an externally threaded screw 2 is arranged.
  • electrical conductors 3 and 4 of two electrical cables 5 and 6, which are in particular energy cables. They are fixed in the mounting position by the screws 2 in the terminal 1 and thereby electrically conductively connected to each other.
  • the electrical conductors 3 and 4 are designed in a preferred embodiment as a stranded conductor. They are preferably made of aluminum or copper.
  • the conductors 3 and 4 may also be constructed of segments in which individual wires are combined.
  • the screw 2 consists of two parts to be screwed together, a contact part 7 and an actuating part 8.
  • the contact part 7 is designed as a cylindrical hollow body with an external thread 9. It has an intended for contact with an electrical conductor 3 or 4 contact surface 10.
  • a circumferential predetermined breaking point 11 is attached, whose position is arbitrary in itself. It only needs to have a clear distance from the constructional surface 10 on the one hand and also from its end face 12 remote from the contact surface 10 on the other hand, so that the actuating part 8 can be screwed onto the contact part 7.
  • the actuating part 8 is designed as a cap with a transverse to its axial direction bottom portion 13.
  • the bottom portion 13 may be made closed. He can according to the representation in the Fig. 2 and 4 but also be designed as a circumferential, a central through hole releasing collar.
  • the collar may also be interrupted at least once in the circumferential direction.
  • the actuating member 8 has an external thread 9 of the contact part 7 matching internal thread 14, which is interrupted in its course by a clear diameter of the operating part 8 enlarging extension 15.
  • the extension 15 extends in the axial direction of the operating part 8. It has an upper edge 16 and a lower edge 17.
  • a circumferential predetermined breaking point 18 is also attached, which is located at the level of the upper edge 16 of the extension 15 with advantage. Due to the predetermined breaking point 18, the one-piece actuating part 8 is divided into a lying above the same upper part 19 and below the predetermined breaking point 18 lower part 20.
  • the operating part 8 can according to Fig. 4 a peripheral surface designed as a polygon, in particular as a hexagon, for engaging a tool suitable for rotating the screw.
  • the through hole optionally present in the upper part 19 of the actuating part 8 may also have a polygonal, preferably hexagonal, cross section for insertion of a corresponding tool.
  • a preferably circumferential, radially outwardly projecting projection 21 may be attached to the upper part 19 of the Betöt Trent Inc.tells 8, which may serve as a contact surface for the tool.
  • the two sheared off parts can be removed so that only the lower part of the contact part 7 and the lower part 20 of the operating part 8 screwed onto it remain ( Fig. 7 ).
  • a further rotation of the lower part 20 of the actuating part 8 on the contact part 7 it reaches until it rests against the terminal 1. If it is further rotated in this position by means of the tool with sufficient force, then the protruding from the terminal 1 part of the contact part. 7 tore off ( Fig. 9 ). It can be lifted together with the lower part 20 of the operating part 8 of the terminal 1.
  • the wall thickness of the contact part 7 is to be dimensioned as a function of the size of the force to be applied by the tool.
  • the contact part 7 can according to Fig. 11 also have an extending in the axial direction, reducing its diameter constriction 22 through which the external thread 9 is interrupted.
  • the axial length of the constriction 22 is short in relation to the length of the contact part 7.
  • the predetermined breaking point 11 is attached to the contact surface 10 facing the end of the constriction 22.
  • Fig. 12 apparent operating part 8 are used, which has a continuous internal thread 14. Again, however, a two-part actuator 8 can be used again.
  • the definition of a conductor 3 in a terminal 1 also takes place when using a contact part 7 Fig. 11 in the same way as it is for them on the basis of Fig. 5 to 10 is described.

Landscapes

  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)

Claims (8)

  1. Vis de serrage pour la fixation d'un conducteur électrique dans une borne en métal prenant la forme d'une pièce tubulaire ayant dans sa paroi au moins un trou traversant pourvu d'un filetage servant à recevoir la vis de serrage comportant dans sa structure au moins un point de rupture théorique permettant de limiter la force pouvant s'exercer par le biais d'un outil s'engrenant au niveau de la vis de serrage et provoquant une rotation sur elle-même autour de son axe, caractérisée en ce
    - que la vis de serrage comporte une partie de contact (7) en forme de tube pourvue d'un filetage extérieur (9) et pouvant être vissée dans le trou traversant de la borne (1), ladite partie ayant au niveau de son extrémité axiale une surface de contact (10) définie servant à appuyer contre un conducteur électrique (3.4) se trouvant dans la borne et une partie de rupture théorique (11) périphérique dans sa trajectoire passant à une distance significative par rapport à cette surface de contact;
    - que la vis de serrage se compose en outre d'une partie supérieure (19) et d'une partie inférieure (20) sur laquelle la partie de contact (7) peut être vissée, avec un filetage intérieur (14) et une surface d'appui pour l'outil équipé d'une partie d'actionnement (8), la partie supérieure (19) prenant la forme d'un bouchon avec une zone de fond (13) s'étendant transversalement par rapport à sa direction axiale;
    - que la partie d'actionnement (8) est vissée de telle sorte, en position de montage, sur la partie de contact (7) que son côté avant (12) opposé à la surface de contact (10) repose contre la zone de fond (13) de la partie supérieure (19) de la partie d'actionnement (8); et
    - que la partie de contact (7) a une épaisseur de paroi définie qui conduit, après avoir atteint le point de fixation de la vis de serrage dans la borne par le biais de sa rotation à l'aide de l'outil et ainsi le cisaillement défini de la partie, reposant au-dessus du point de rupture théorique, de la partie de contact (7) ainsi que de la partie supérieure (19) de la partie d'actionnement (8), à l'arrachement de la zone de la partie de contact ressortant de la borne (1) au moyen de la partie inférieure (20) de la partie d'actionnement tournée à l'aide de l'outil.
  2. Vis de serrage selon la revendication 1, caractérisée en ce que la partie supérieure (19) et la partie inférieure (20) de la partie de fixation (8) sont réunies en une unité réalisée d'un seul tenant, avec un point de rupture théorique (18) périphérique placé entre les deux parties.
  3. Vis de serrage selon la revendication 2, caractérisée en ce que le filetage intérieur (14) de la partie d'actionnement (8) réalisée d'un seul tenant est interrompu approximativement dans la région centrale de celle-ci par un élargissement (15) agrandissant le diamètre étroit de la partie d'actionnement (8) s'étendant dans la direction axiale de celle-ci entre une arête supérieure (16) et une arête inférieure (17).
  4. Vis de serrage selon la revendication 3, caractérisée en ce que le point de rupture théorique (18) de la partie d'actionnement (8) réalisée d'un seul tenant se situe approximativement à la hauteur de l'arête supérieure (16) de l'élargissement.
  5. Vis de serrage selon la revendication 3 ou 4, caractérisée en ce que le point de rupture théorique (11) de la partie de contact (7) se situe, dans la position de montage, à hauteur de l'élargissement (15) de la partie d'actionnement (8).
  6. Vis de serrage selon l'une quelconque des revendications 2 à 5, caractérisée en ce qu'une saillie (21) périphérique s'éloignant vers l'extérieur dans le plan radial est disposée au niveau de la partie d'actionnement (8), au-dessus du point de rupture théorique (18) de celle-ci.
  7. Vis de serrage selon l'une quelconque des revendications 1 à 6, caractérisée en ce que la zone de fond (13) de la partie supérieure (19) de la partie d'actionnement (8) prend la forme d'un trou traversant de col périphérique relâché.
  8. Vis de serrage selon la revendication 1, caractérisée en ce que le filetage extérieur (9) de la partie de contact (7) est interrompu par un rétrécissement (22) réduisant le diamètre de ladite partie et s'étendant dans la direction axiale au-delà d'une longueur courte par rapport à la longueur de la partie de contact (7), le point de rupture théorique (11) faisant fléchir l'extrémité orientée vers la surface de contact (10) dudit rétrécissement.
EP11305125.4A 2011-02-08 2011-02-08 Vis de serrage Not-in-force EP2487755B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP11305125.4A EP2487755B1 (fr) 2011-02-08 2011-02-08 Vis de serrage
PL11305125T PL2487755T3 (pl) 2011-02-08 2011-02-08 Śruba zaciskowa
AU2012200645A AU2012200645A1 (en) 2011-02-08 2012-02-03 Arrangement with a Clamp of Metal Constructed as a Pipe Piece
RU2012104230/07A RU2495519C1 (ru) 2011-02-08 2012-02-07 Система с выполненной в виде отрезка трубы клеммой из металла
BR102012002802A BR102012002802A2 (pt) 2011-02-08 2012-02-07 disposiÇço com um grampo de metal conformado como segmento tubular
CN201210027588.0A CN102637966B (zh) 2011-02-08 2012-02-08 具有设计为管件的金属接线夹的装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11305125.4A EP2487755B1 (fr) 2011-02-08 2011-02-08 Vis de serrage

Publications (2)

Publication Number Publication Date
EP2487755A1 EP2487755A1 (fr) 2012-08-15
EP2487755B1 true EP2487755B1 (fr) 2013-09-18

Family

ID=43837968

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11305125.4A Not-in-force EP2487755B1 (fr) 2011-02-08 2011-02-08 Vis de serrage

Country Status (2)

Country Link
EP (1) EP2487755B1 (fr)
PL (1) PL2487755T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105449390A (zh) * 2015-12-16 2016-03-30 国网浙江省电力公司湖州供电公司 一种低压抢修用抗拉力线夹
US11953043B2 (en) * 2020-04-01 2024-04-09 Hubbell Incorporated Breakaway threaded fasteners and electrical connectors having such fasteners

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2296061B (en) * 1994-03-15 1997-01-29 Sicame Electrical Dev Ltd Screw clamping apparatus
DE102004039811A1 (de) * 2004-08-11 2006-02-23 Pfisterer Kontaktsysteme Gmbh & Co. Kg Befestigungsmittel, insbesondere Abreißschraube, zugehöriges System und Verfahren zum Eindrehen des Befestigungsmittels
EP2071201B1 (fr) * 2007-12-11 2010-03-24 Nexans Vis à cisaillement
EP2148392A1 (fr) * 2008-07-25 2010-01-27 Nexans Vis de serrage

Also Published As

Publication number Publication date
PL2487755T3 (pl) 2014-02-28
EP2487755A1 (fr) 2012-08-15

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