EP1085601B1 - Elastic cage-type clamp terminal - Google Patents

Elastic cage-type clamp terminal Download PDF

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Publication number
EP1085601B1
EP1085601B1 EP20000410106 EP00410106A EP1085601B1 EP 1085601 B1 EP1085601 B1 EP 1085601B1 EP 20000410106 EP20000410106 EP 20000410106 EP 00410106 A EP00410106 A EP 00410106A EP 1085601 B1 EP1085601 B1 EP 1085601B1
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EP
European Patent Office
Prior art keywords
screw
branch
tunnel
connection terminal
cage
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
EP20000410106
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German (de)
French (fr)
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EP1085601A1 (en
Inventor
Gérard Bonente
Thierry Millet
Daniel Vanzetto
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Schneider Electric Industries SAS
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Schneider Electric Industries SAS
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Publication of EP1085601A1 publication Critical patent/EP1085601A1/en
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    • 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
    • H01R4/38—Clamped connections, spring connections utilising a clamping member acted on by screw or nut
    • 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
    • H01R4/363—Conductive members located under tip of screw with intermediate part between tip and conductive member

Definitions

  • the cage terminals of the type mentioned generate significant tensile forces when tightening the cable to be connected. These forces in the terminal can reach 300 daN (see curve A on the figure 5 ), while values ten times smaller would be sufficient to ensure a suitable electrical contact pressure for the passage of the current.
  • a high initial force value has the advantage of causing the shaping of the conductors of the cable, but this effort can decrease as the creep and the deformation of the metal of the conductors over time. This results in a loosening effect of the terminals, resulting in risk of overheating at the contact area.
  • the document EP 336251 discloses a screw terminal having a clamping frame and a fixing bracket arranged perpendicularly, and allowing a double connection of a contact pad and a wire or cable. An interval is provided between the ends of the open frame.
  • the object of the invention is to provide an elastic cage connection terminal permanently ensuring a good electrical contact with the cable without using additional spring inside the cage.
  • the cage comprises a lateral branch projecting from the horizontal terminal arm supporting the screw, and comprising a rectangular orifice in which engages an extension of said horizontal arm, which is supported on the lower edge of the rectangular orifice being separated from the upper edge by the first axial play when the terminal is in the loosened state.
  • a second transverse clearance is provided between the inner face of the side branch and the two straight edges flanking the base of the extension.
  • the two terminal branches of the cage are superimposed opposite the bottom by being separated by the first axial play.
  • the outer branch has a smooth circular orifice having a larger diameter than the tapped hole in the internal branch.
  • the second transverse clearance is provided in this case on the side of the end of the outer branch between the circular orifice and the screw barrel, the lifting of the outer branch causing engagement with the barrel of the screw when a predetermined tightening threshold is reached, so as to obtain a torque limiter for generating a constant clamping force.
  • a connection terminal 10 comprises a cage 12, a clamping screw 14 and a connection pad 16.
  • the cage 12 has a one-piece structure made by cutting and folding a conductive metal strip so as to form a section frame substantially quadrangular.
  • the inside of the cage 12 is provided with an opening 18 delimited by a bottom 20 joined to two vertical vertical branches 22, 24 extending parallel to one another, the branch 24 being extended at right angles by an upper branch 26 traversed by the clamping screw 14.
  • the vertical side branch 22 is provided at the upper part with a rectangular orifice 28 in which a tenon-shaped end extension of the upper branch 26 engages.
  • the screw 14 is housed in a tapped hole 32 formed in a collar 34 of the upper branch 26.
  • connection pad 16 of copper is housed in the opening 18 of the cage 12 extending parallel to the horizontal branch 26, and is intended to jam the cable 36 against the bottom 20 during the tightening of the screw 14.
  • connection pad 16 is secured to the end of the threaded rod of the screw 14, so as to move in birectional vertical translation in the opening 18 during the rotation of the 14.
  • the connection pad 16 approaches the fixed bottom 20, causing the cable 36 to jam against the latter.
  • connection pad 16 In the case of a mobile cage 12, the connection pad 16 is fixed, and the end of the screw 14 bears on the upper face of the pad 16 without being attached thereto. In case of tightening of the screw 14, the cage 12 moves upwards, and the bottom 20 wedges the cable 36 against the lower face of the beach 16.
  • the end of the vertical lateral branch 22 protrudes from the horizontal branch 26, and the terminal extension bears on the lower edge of the rectangular orifice 28, being separated from the upper edge by a first set J1 axial when the terminal 10 is in the loosened state ( Figures 1 to 3 ).
  • a second transverse clearance J2 is provided between the inner face of the branch 22 and the two rectilinear edges 38 flanking the base of the extension 30, so as to allow the elastic deformation of the cage 12 during the tightening of the screw 14.
  • the actuation of the screw 14 causes at the start of clamping an elastic deformation of the cage 12 following the lifting of the end extension indicated by the arrow F1.
  • This lifting movement is possible thanks to the presence of the games J1 and J2, and stops as soon as the terminal extension abuts against the upper edge of the rectangular orifice 28.
  • the axial clamping force in the cage 12 is relatively moderate during the elastic deformation, and is located in the vicinity of a first tightening threshold in a range of 10 to 40 daN.
  • the variation of the axial clamping force during this elastic deformation is represented by the first slope of the curve B on the figure 5 .
  • the first tightening threshold S1 is reached when the relative displacement of the screw 14 relative to the tapping of the hole 32 corresponds to the dimension of the first set J1 which is of the order of 0.5 mm. This first tightening threshold S1 is entirely adapted to the passage of current between the track 16 and the cable 36.
  • the cage 112 of the terminal 100 comprises opposite the bottom 120, two end branches 123, 125 superimposed and separated from each other by the first set J1 axial.
  • the outer curved branch 125 is connected to the right vertical lateral branch 124, and is provided with a smooth circular orifice 127 allowing the passage of the screw 14.
  • the other internal branch 123 is folded at right angles to the lateral branch 122 vertical left and is provided with a threaded hole 132 of smaller diameter for the screw 14.
  • the collar 134 is arranged in this case under the lower face of the branch 123.
  • the second set J2 transverse is provided on the side of the end of the branch 125 between the circular hole 127 and the barrel of the screw 14.
  • the connection pad 16 is identical to that of the first embodiment.
  • terminal 100 The operation of terminal 100 according to the Figures 6 to 8 is the next :
  • the horizontal external branch 125 is parallel to the internal branch 123 with a uniform vertical offset corresponding to the first set J1.
  • the first tightening threshold S1 is reached at the beginning of tightening the screw 14 when the end of the internal branch 123 has caught the first set J1, and abuts against the lower face of the branch 125 external.
  • the first axial clearance J1 adapted to the elastic deformation of the cages 12, 112 extends in the direction of displacement of the screw 14.

Landscapes

  • Installation Of Indoor Wiring (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Multi-Conductor Connections (AREA)
  • Connections Arranged To Contact A Plurality Of Conductors (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Cable Accessories (AREA)

Description

Domaine technique de l'inventionTechnical field of the invention

L'invention est relative à une borne de raccordement ayant :

  • une cage réalisée par découpage et pliage d'une bande métallique pour former un cadre délimitant une ouverture de section quadrangulaire pour l'insertion d'un câble à raccorder,
  • une vis de serrage destinée à serrer le câble entre une plage de connexion et le fond de la cage, ladite vis étant logée dans un trou taraudé ménagé dans une branche supérieure horizontale de ladite cage,
  • et deux branches terminales de fermeture du cadre élastique de la cage séparées dans l'état desserré par au moins un premier jeu axial s'étendant dans la direction de déplacement de la vis.
The invention relates to a connection terminal having:
  • a cage made by cutting and folding a metal strip to form a frame delimiting an opening of quadrangular section for insertion of a cable to be connected,
  • a clamping screw for clamping the cable between a connection pad and the bottom of the cage, said screw being housed in a threaded hole formed in a horizontal upper branch of said cage,
  • and two closing ends of the elastic frame of the cage separated in the loosened state by at least a first axial play extending in the direction of movement of the screw.

Etat de la techniqueState of the art

Les bornes à cages du genre mentionné engendrent des efforts de traction importants au moment du serrage du câble à raccorder. Ces efforts dans la borne peuvent atteindre 300 daN (voir courbe A sur la figure 5), alors que des valeurs dix fois moins importantes seraient suffisantes pour assurer une pression de contact électrique convenable permettant le passage du courant. Une valeur d'effort initial élevé présente l'avantage de provoquer la mise en forme des conducteurs du câble, mais cet effort peut diminuer au fur et à mesure du fluage et de la déformation du métal des conducteurs dans le temps. Il en résulte un effet de desserrage des bornes, entraînant des risques d'échauffement au niveau de la zone de contact.The cage terminals of the type mentioned generate significant tensile forces when tightening the cable to be connected. These forces in the terminal can reach 300 daN (see curve A on the figure 5 ), while values ten times smaller would be sufficient to ensure a suitable electrical contact pressure for the passage of the current. A high initial force value has the advantage of causing the shaping of the conductors of the cable, but this effort can decrease as the creep and the deformation of the metal of the conductors over time. This results in a loosening effect of the terminals, resulting in risk of overheating at the contact area.

On a déjà proposé des bornes ayant une certaine élasticité pour compenser un éventuel desserrage des vis. Les documents FR-A-2696584 et DE-A-19513281 se rapportent à des bornes à cages équipées d'un ressort de compression destiné à emmagasiner une réserve d'énergie élastique pour assurer un maintien correct du conducteur à raccorder lors d'un léger dévissage de la vis de serrage.It has already been proposed terminals having a certain elasticity to compensate for any loosening of the screws. The documents FR-A-2696584 and DE-A-19513281 relate to cage terminals equipped with a compression spring for storing a reserve of elastic energy to ensure proper retention of the conductor to be connected during a slight unscrewing of the clamping screw.

Le document EP 336251 décrit une borne à vis ayant un cadre de serrage et un étrier de fixation disposés perpendiculairement, et autorisant une double connexion d'une plage de contact et d'un fil ou câble. Un intervalle est prévu entre les extrémités du cadre ouvert.The document EP 336251 discloses a screw terminal having a clamping frame and a fixing bracket arranged perpendicularly, and allowing a double connection of a contact pad and a wire or cable. An interval is provided between the ends of the open frame.

Objet de l'inventionObject of the invention

L'objet de l'invention consiste à réaliser une borne de raccordement à cage élastique garantissant en permanence un bon contact électrique avec le câble sans utiliser de ressort additionnel à l'intérieur de la cage.The object of the invention is to provide an elastic cage connection terminal permanently ensuring a good electrical contact with the cable without using additional spring inside the cage.

Le dispositif selon l'invention est caractérisé en ce que :

  • des moyens de butée déterminent un premier seuil de serrage après le rattrapage du premier jeu (J1) en début de serrage de la vis,
  • la cage devient plus rigide lors du vissage poursuivi de la vis pour augmenter la force de serrage au-delà dudit premier seuil, et revient ensuite à sa géométrie initiale au desserrage de la vis,
  • ladite cage métallique possédant une structure élastique à double pente telle que l'effort axial de traction engendré dans la borne lors du vissage croît plus rapidement dans la deuxième pente que dans la première pente, le passage de la première pente vers le deuxième pente s'effectuant après dépassement du premier seuil de serrage.
The device according to the invention is characterized in that:
  • stop means determine a first tightening threshold after catching the first set (J1) at the beginning of tightening the screw,
  • the cage becomes stiffer during the continued screwing of the screw to increase the clamping force beyond said first threshold, and then returns to its initial geometry when the screw is loosened,
  • said metal cage having a double slope elastic structure such that the axial traction force generated in the terminal during screwing grows more rapidly in the second slope than in the first slope, the passage from the first slope to the second slope s' performing after exceeding the first tightening threshold.

Une élasticité importante intervient en début de serrage jusqu'à la mise en butée, à partir de laquelle on retrouve le comportement classique d'une cage pour des efforts importants. En cas de léger desserrage de la vis suite au fluage des conducteurs du câble, la cage est sollicitée élastiquement vers l'agencement correspondant au premier seuil de serrage.An important elasticity occurs at the beginning of the tightening until the abutment, from which one finds the traditional behavior of a cage for important efforts. In case of slight loosening of the screw due to the creep of the cable conductors, the cage is biased elastically towards the arrangement corresponding to the first tightening threshold.

Selon un premier mode de réalisation préférentiel, la cage comporte une branche latérale faisant saillie de la branche horizontale terminale supportant la vis, et comprenant un orifice rectangulaire dans lequel s'engage une extension de ladite branche horizontale, laquelle prend appui sur l'arête inférieure de l'orifice rectangulaire en étant séparée de l'arête supérieure par le premier jeu axial lorsque la borne se trouve dans l'état desserré. Un deuxième jeu transversal est prévu entre la face interne de la branche latérale et les deux arêtes rectilignes encadrant la base de l'extension.According to a first preferred embodiment, the cage comprises a lateral branch projecting from the horizontal terminal arm supporting the screw, and comprising a rectangular orifice in which engages an extension of said horizontal arm, which is supported on the lower edge of the rectangular orifice being separated from the upper edge by the first axial play when the terminal is in the loosened state. A second transverse clearance is provided between the inner face of the side branch and the two straight edges flanking the base of the extension.

Selon un deuxième mode de réalisation, les deux branches terminales de la cage sont superposées à l'opposé du fond en étant séparées par le premier jeu axial. La branche externe est dotée d'un orifice circulaire lisse ayant un diamètre supérieur au trou taraudé ménagé dans la branche interne. Le deuxième jeu transversal est prévu dans ce cas du côté de l'extrémité de la branche externe entre l'orifice circulaire et le fût de la vis, le soulèvement de la branche externe provoquant la venue en engagement contre le fût de la vis lorsqu'un seuil de serrage prédéterminé est atteint, de manière à obtenir un limiteur de couple permettant de générer un effort de serrage constant.According to a second embodiment, the two terminal branches of the cage are superimposed opposite the bottom by being separated by the first axial play. The outer branch has a smooth circular orifice having a larger diameter than the tapped hole in the internal branch. The second transverse clearance is provided in this case on the side of the end of the outer branch between the circular orifice and the screw barrel, the lifting of the outer branch causing engagement with the barrel of the screw when a predetermined tightening threshold is reached, so as to obtain a torque limiter for generating a constant clamping force.

Description sommaire des dessinsBrief description of the drawings

D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre d'un mode de réalisation de l'invention donné à titre d'exemple non limitatif, et représenté aux dessins annexés dans lesquels:

  • la figure 1 est une vue en élévation de la borne à cage élastique selon l'invention, la borne étant dans l'état desserré sans la plage de connexion ;
  • les figures 2 et 3 montrent des vues en perspective de la borne de la figure 1 ;
  • la figure 4 représente une vue identique de la figure 1 lorsque la borne se trouve dans l'état serré ;
  • la figure 5 montre les diagrammes de l'effort de serrage en fonction de la déformation d'une borne à cage classique ( courbe A à pente unique), et d'une borne selon l'invention ( courbe B à double pente);
  • les figures 6 à 8 sont des vues identiques des figures 1, 2 et 4 d'une variante de réalisation.
Other advantages and features will emerge more clearly from the following description of an embodiment of the invention given by way of non-limiting example, and represented in the appended drawings in which:
  • the figure 1 is an elevational view of the elastic cage terminal according to the invention, the terminal being in the loosened state without the connection pad;
  • the figures 2 and 3 show perspective views of the terminal of the figure 1 ;
  • the figure 4 represents an identical view of the figure 1 when the terminal is in the tight state;
  • the figure 5 shows the diagrams of the clamping force as a function of the deformation of a conventional cage terminal (curve A with a single slope), and of a terminal according to the invention (curve B with a double slope);
  • the Figures 6 to 8 are identical views of Figures 1, 2 and 4 of an alternative embodiment.

Description d'un mode de réalisation préférentielDescription of a preferred embodiment

En référence aux figures 1 à 4, une borne 10 de raccordement comporte une cage 12, une vis de serrage 14 et une plage de connexion 16. La cage 12 présente une structure monobloc réalisée par découpage et pliage d'une bande métallique conductrice, de manière à former un cadre de section sensiblement quadrangulaire. L'intérieur de la cage 12 est dotée d'une ouverture 18 délimitée par un fond 20 réuni à deux branches 22, 24 latérales verticales s'étendant parallèlement l'une par rapport à l'autre, la branche 24 étant prolongée à angle droit par une branche 26 supérieure traversée par la vis de serrage 14.With reference to Figures 1 to 4 a connection terminal 10 comprises a cage 12, a clamping screw 14 and a connection pad 16. The cage 12 has a one-piece structure made by cutting and folding a conductive metal strip so as to form a section frame substantially quadrangular. The inside of the cage 12 is provided with an opening 18 delimited by a bottom 20 joined to two vertical vertical branches 22, 24 extending parallel to one another, the branch 24 being extended at right angles by an upper branch 26 traversed by the clamping screw 14.

La branche latérale 22 verticale est pourvue à la partie supérieure d'un orifice 28 rectangulaire dans lequel s'engage une extension 30 terminale en forme de tenon de la branche supérieure 26. La vis 14 est logée dans un trou 32 taraudé ménagé dans un collet 34 de la branche supérieure 26.The vertical side branch 22 is provided at the upper part with a rectangular orifice 28 in which a tenon-shaped end extension of the upper branch 26 engages. The screw 14 is housed in a tapped hole 32 formed in a collar 34 of the upper branch 26.

La plage de connexion 16 en cuivre est logée dans l'ouverture 18 de la cage 12 en s'étendant parallèlement à la branche 26 horizontale, et est destinée à coincer le câble 36 contre le fond 20 lors du serrage de la vis 14.The connection pad 16 of copper is housed in the opening 18 of the cage 12 extending parallel to the horizontal branch 26, and is intended to jam the cable 36 against the bottom 20 during the tightening of the screw 14.

Dans le cas d'une cage 12 fixe, la plage de connexion 16 est solidarisée à l'extrémité de la tige filetée de la vis 14, de manière à se déplacer en translation verticale birectionnelle dans l'ouverture 18 lors de la rotation de la vis 14. En cas de serrage de la vis 14, la plage de connexion 16 se rapproche du fond 20 fixe en provoquant le coincement du câble 36 contre ce dernier.In the case of a fixed cage 12, the connection pad 16 is secured to the end of the threaded rod of the screw 14, so as to move in birectional vertical translation in the opening 18 during the rotation of the 14. When the screw 14 is tightened, the connection pad 16 approaches the fixed bottom 20, causing the cable 36 to jam against the latter.

Dans le cas d'une cage 12 mobile, la plage de connexion 16 est fixe, et l'extrémité de la vis 14 prend appui sur la face supérieure de la plage 16 sans y être attachée. En cas de serrage de la vis 14, la cage 12 se déplace vers le haut, et le fond 20 coince le câble 36 contre la face inférieure de la plage 16.In the case of a mobile cage 12, the connection pad 16 is fixed, and the end of the screw 14 bears on the upper face of the pad 16 without being attached thereto. In case of tightening of the screw 14, the cage 12 moves upwards, and the bottom 20 wedges the cable 36 against the lower face of the beach 16.

Selon l'invention, l'extrémité de la branche latérale 22 verticale fait saillie de la branche 26 horizontale, et l'extension 30 terminale prend appui sur l'arête inférieure de l'orifice 28 rectangulaire en étant séparée de l'arête supérieure par un premier jeu J1 axial lorsque la borne 10 se trouve dans l'état desserré ( figures 1 à 3). Un deuxième jeu J2 transversal est prévu entre la face interne de la branche 22 et les deux arêtes 38 rectilignes encadrant la base de l'extension 30, de manière à autoriser la déformation élastique de la cage 12 lors du serrage de la vis 14.According to the invention, the end of the vertical lateral branch 22 protrudes from the horizontal branch 26, and the terminal extension bears on the lower edge of the rectangular orifice 28, being separated from the upper edge by a first set J1 axial when the terminal 10 is in the loosened state ( Figures 1 to 3 ). A second transverse clearance J2 is provided between the inner face of the branch 22 and the two rectilinear edges 38 flanking the base of the extension 30, so as to allow the elastic deformation of the cage 12 during the tightening of the screw 14.

Pendant la phase de branchement d'un câble 36 illustrée à la figure 4, l'actionnement de la vis 14 provoque en début de serrage une déformation élastique de la cage 12 suite au soulèvement de l'extension 30 terminale indiqué par la flèche F1. Ce mouvement de soulèvement est possible grâce à la présence des jeux J1 et J2, et s'arrête dès que l'extension 30 terminale vient en butée contre l'arête supérieure de l'orifice 28 rectangulaire. L'effort axial de serrage dans la cage 12 est relativement modéré durant la déformation élastique, et est situé au voisinage d'un premier seuil de serrage se trouvant dans une fourchette de 10 à 40 daN. La variation de l'effort axial de serrage durant cette déformation élastique est représentée par la première pente de la courbe B sur la figure 5. Le premier seuil de serrage S1 est atteint lorsque le déplacement relatif de la vis 14 par rapport au taraudage du trou 32 correspond à la dimension du premier jeu J1 qui est de l'ordre de 0,5mm. Ce premier seuil de serrage S1 est tout à fait adapté au passage du courant entre la plage 16 et le câble 36.During the connection phase of a cable 36 illustrated in FIG. figure 4 , the actuation of the screw 14 causes at the start of clamping an elastic deformation of the cage 12 following the lifting of the end extension indicated by the arrow F1. This lifting movement is possible thanks to the presence of the games J1 and J2, and stops as soon as the terminal extension abuts against the upper edge of the rectangular orifice 28. The axial clamping force in the cage 12 is relatively moderate during the elastic deformation, and is located in the vicinity of a first tightening threshold in a range of 10 to 40 daN. The variation of the axial clamping force during this elastic deformation is represented by the first slope of the curve B on the figure 5 . The first tightening threshold S1 is reached when the relative displacement of the screw 14 relative to the tapping of the hole 32 corresponds to the dimension of the first set J1 which is of the order of 0.5 mm. This first tightening threshold S1 is entirely adapted to the passage of current between the track 16 and the cable 36.

Lorsque le serrage de la vis 14 est poursuivi après la mise en butée de l'extension 30, la cage 12 devient plus rigide, et l'effort axial de traction dans la borne 10 croît rapidement avec la deuxième pente de la courbe B, laquelle est comparable au comportement d'une cage classique illustrée par la courbe A. En fonction du couple exercé sur la vis 14, on obtient alors un degré de serrage intermédiaire situé entre le premier seuil S1 et un deuxième seuil S2 maxi de 300 daN. La déformation de la cage 12 pendant cette deuxième phase de serrage est inférieure à la déformation élastique engendrée lors du rattrapage du premier jeu J1.When the tightening of the screw 14 is continued after the abutment of the extension 30, the cage 12 becomes more rigid, and the axial tensile force in the terminal 10 increases rapidly with the second slope of the curve B, which is comparable to the behavior of a conventional cage illustrated by the curve A. As a function of the torque exerted on the screw 14, an intermediate degree of clamping is obtained between the first threshold S1 and a second threshold S2 maxi of 300 daN. The deformation of the cage 12 during this second clamping phase is less than the elastic deformation generated during the catching of the first set J1.

La déformation de la cage 12 lors du vissage de la vis 14 se traduit par une fonction de ressort à double pente. En cas de desserrage suite au tassement et au fluage des conducteurs du câble 36, l'effort axial dans la cage 12 diminue et est ramené vers le premier seuil S1 sur la courbe B. Cette réserve élastique reste néanmoins suffisante pour maintenir un contact correct entre la plage 16 et le câble 36.The deformation of the cage 12 during the screwing of the screw 14 results in a double-slope spring function. In case of loosening due to settlement and creep of the conductors of the cable 36, the axial force in the cage 12 decreases and is brought back to the first threshold S1 on the curve B. This elastic reserve remains nevertheless sufficient to maintain a correct contact between the range 16 and the cable 36.

Sur la variante des figures 6 à 8, la cage 112 de la borne 100 comporte à l'opposé du fond 120, deux branches d'extrémités 123, 125 superposées et séparées l'une de l'autre par le premier jeu J1 axial. La branche 125 recourbée externe est reliée à la branche latérale 124 verticale de droite, et est dotée d'un orifice 127 circulaire lisse autorisant le passage de la vis 14. L'autre branche 123 interne est pliée en équerre par rapport à la branche latérale 122 verticale de gauche, et est pourvue d'un trou taraudé 132 de diamètre inférieur pour la vis 14. Le collet 134 est agencé dans ce cas sous la face inférieure de la branche 123. Le deuxième jeu J2 transversal est prévu du côté de l'extrémité de la branche 125 entre l'orifice 127 circulaire et le fût de la vis 14. La plage de connexion 16 est identique à celle du premier mode de réalisation.On the variant of Figures 6 to 8 , the cage 112 of the terminal 100 comprises opposite the bottom 120, two end branches 123, 125 superimposed and separated from each other by the first set J1 axial. The outer curved branch 125 is connected to the right vertical lateral branch 124, and is provided with a smooth circular orifice 127 allowing the passage of the screw 14. The other internal branch 123 is folded at right angles to the lateral branch 122 vertical left and is provided with a threaded hole 132 of smaller diameter for the screw 14. The collar 134 is arranged in this case under the lower face of the branch 123. The second set J2 transverse is provided on the side of the end of the branch 125 between the circular hole 127 and the barrel of the screw 14. The connection pad 16 is identical to that of the first embodiment.

Le fonctionnement de la borne 100 selon les figures 6 à 8 est le suivant :The operation of terminal 100 according to the Figures 6 to 8 is the next :

Dans l'état desserré de la figure 6, la branche 125 externe horizontale est parallèle à la branche 123 interne avec un décalage vertical uniforme correspondant au premier jeu J1.In the loose state of the figure 6 the horizontal external branch 125 is parallel to the internal branch 123 with a uniform vertical offset corresponding to the first set J1.

Lors du raccordement du câble 36, le premier seuil de serrage S1 est atteint en début de serrage de la vis 14 lorsque l'extrémité de la branche 123 interne a rattrapé le premier jeu J1, et arrive en butée contre la face inférieure de la branche 125 externe.When connecting the cable 36, the first tightening threshold S1 is reached at the beginning of tightening the screw 14 when the end of the internal branch 123 has caught the first set J1, and abuts against the lower face of the branch 125 external.

Sur la figure 8, lorsque le serrage de la vis 14 est poursuivi après la mise en butée de l'extrémité de la branche 123, la cage 112 devient plus rigide, et l'effort axial de traction dans la borne 100 croît rapidement avec la deuxième pente de la courbe B. Il en résulte un léger soulèvement de la branche 125 externe dans le sens de la flèche F2, qui est susceptible de venir en engagement contre le fût de la vis 14 lorsqu'un seuil prédéterminé est atteint. Le vissage de la vis 14 est alors rendu impossible, et on obtient un limiteur de couple permettant de générer un effort de serrage constant.On the figure 8 when the tightening of the screw 14 is continued after the end of the branch 123 has been stopped, the cage 112 becomes more rigid, and the axial traction force in the terminal 100 increases rapidly with the second slope of the B curve. This results in a slight lifting of the external branch 125 in the direction of the arrow F2, which is likely to come into engagement against the shaft of the screw 14 when a predetermined threshold is reached. The screwing of the screw 14 is then made impossible, and a torque limiter is obtained to generate a constant clamping force.

Dans les deux modes de réalisation des figures 1 à 8, le premier jeu J1 axial adapté à la déformation élastique des cages 12, 112 s'étend dans la direction de déplacement de la vis 14.In both embodiments of the Figures 1 to 8 , the first axial clearance J1 adapted to the elastic deformation of the cages 12, 112 extends in the direction of displacement of the screw 14.

Claims (7)

  1. A connection terminal having:
    - a tunnel (12, 112) achieved by cutting and folding of a metal strip to form a frame delineating an opening (18) of quadrangular cross-section for insertion of a cable (36) to be connected,
    - a clamping screw (14) designed to clamp the cable (36) between a connecting strip (16) and the bottom part (20, 120) of the tunnel (12, 112), said screw being housed in a tapped hole (32, 132) arranged in a horizontal top branch (26, 123) of said tunnel,
    - and two terminal branches (22, 26 ; 123, 125) closing the elastic frame of the tunnel (12, 112) separated in the slackened state by at least a first axial clearance (J1) extending in the direction of movement of the screw (14),
    characterized in that
    - stop means determine a first clamping threshold (S1) after the first clearance (J1) has been taken up at the beginning of tightening of the screw (14),
    - the tunnel (12, 112) becomes more rigid when the screw (14) is tightened further to increase the clamping force beyond said first threshold, and then reverts to its initial geometry when the screw is slackened, said metal tunnel (12, 112) having an elastic structure with a double slope such that the axial traction force generated in the terminal (10,100) when tightening is performed increases more quickly in the second slope than in the first slope, switching from the first slope to the second slope taking place after the first clamping threshold (S1) has been exceeded.
  2. The connection terminal according to claim 1, characterized in that the tunnel (12) comprises a side branch (22) protruding out from the horizontal terminal branch (26) supporting the screw (14), and comprising a rectangular orifice (28) in which an extension (30) of said horizontal branch (26) engages.
  3. The connection terminal according to claim 2, characterized in that the terminal extension (30) presses on the bottom edge of the rectangular orifice (28), being separated from the top edge by the first axial clearance (J1) when the terminal (10) is in the slackened state.
  4. The connection terminal according to claim 3, characterized in that a second transverse clearance (J2) is provided between the internal face of the side branch (22) and the two straight edges (38) on each side of the base of the extension (30).
  5. The connection terminal according to claim 1, characterized in that the two terminal branches (123, 125) are superposed opposite the bottom part (120), being separated by the first axial clearance (J1).
  6. The connection terminal according to claim 5, characterized in that the external branch (125) is provided with a smooth circular orifice (127) having a diameter larger than the tapped hole (132) arranged in the internal branch (123).
  7. The connection terminal according to claim 6, characterized in that the second transverse clearance (J2) is provided on the same side as the end of the external branch (125) between the circular orifice (127) and the shank of the screw (14), raising of the external branch (125) causing the latter to come into engagement against the shank of the screw (14) when a predetermined clamping threshold is reached so as to obtain a torque limiter enabling a constant clamping force to be generated.
EP20000410106 1999-09-15 2000-08-30 Elastic cage-type clamp terminal Expired - Lifetime EP1085601B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9911694 1999-09-15
FR9911694A FR2798514B1 (en) 1999-09-15 1999-09-15 ELASTIC CAGE CONNECTION TERMINAL

Publications (2)

Publication Number Publication Date
EP1085601A1 EP1085601A1 (en) 2001-03-21
EP1085601B1 true EP1085601B1 (en) 2009-03-18

Family

ID=9550006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000410106 Expired - Lifetime EP1085601B1 (en) 1999-09-15 2000-08-30 Elastic cage-type clamp terminal

Country Status (6)

Country Link
EP (1) EP1085601B1 (en)
CN (1) CN1186855C (en)
AR (1) AR025675A1 (en)
DE (1) DE60041800D1 (en)
ES (1) ES2321273T3 (en)
FR (1) FR2798514B1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2862443B1 (en) * 2003-11-14 2006-10-27 Schneider Electric Ind Sas ELECTRICAL CONNECTION TERMINAL AND ELECTRICAL PROTECTION APPARATUS COMPRISING SUCH A TERMINAL
US7128619B1 (en) * 2004-11-05 2006-10-31 Mcgraw-Edison Company Connector system and method for securing a cable in a connector system
FR2997237B1 (en) 2012-10-23 2014-11-21 Schneider Electric Ind Sas ELASTIC CAGE FOR CONNECTING TERMINAL AND TERMINAL COMPRISING SUCH A CAGE
CN104332722B (en) * 2014-10-23 2017-01-11 江苏海纬电气有限公司 Special grounding wire clamping component for nuclear power bridge frame
CN104347961B (en) * 2014-11-08 2016-08-24 钟明华 Rotary plug-in type four-way cable collection terminal
CN107366782B (en) * 2017-07-31 2023-08-15 江西清华泰豪三波电机有限公司 Clamp device
FR3090225B1 (en) 2018-12-13 2020-11-27 Schneider Electric Ind Sas TERMINAL WITH TIGHTENING COMPENSATION IN PARTICULAR FOR AN ELECTRICAL PROTECTION DEVICE.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4072393A (en) * 1976-06-07 1978-02-07 Mcdermott Robert E Electrical connectors
DE3811023A1 (en) * 1988-03-31 1989-10-19 Asea Brown Boveri SCREW TERMINAL
FR2696584B1 (en) * 1992-10-05 1994-12-02 Merlin Gerin Connection terminal for electrical power equipment.
DE19513281A1 (en) * 1995-04-07 1996-10-10 Kopp Heinrich Ag Combination terminal-clamp for automatic cut=outs

Also Published As

Publication number Publication date
CN1186855C (en) 2005-01-26
CN1288273A (en) 2001-03-21
DE60041800D1 (en) 2009-04-30
FR2798514A1 (en) 2001-03-16
FR2798514B1 (en) 2001-11-02
ES2321273T3 (en) 2009-06-04
EP1085601A1 (en) 2001-03-21
AR025675A1 (en) 2002-12-11

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