EP0974171A1 - Direct boring ground rod, process for its manufacture, and self-locking lug for connecting notably this rod to an electrical conductor - Google Patents

Direct boring ground rod, process for its manufacture, and self-locking lug for connecting notably this rod to an electrical conductor

Info

Publication number
EP0974171A1
EP0974171A1 EP98917277A EP98917277A EP0974171A1 EP 0974171 A1 EP0974171 A1 EP 0974171A1 EP 98917277 A EP98917277 A EP 98917277A EP 98917277 A EP98917277 A EP 98917277A EP 0974171 A1 EP0974171 A1 EP 0974171A1
Authority
EP
European Patent Office
Prior art keywords
stake
yoke
blind hole
conductor
branches
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.)
Withdrawn
Application number
EP98917277A
Other languages
German (de)
French (fr)
Inventor
Jacques Le Bourgeois
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.)
ETS FRENEHARD ET MICHAUX SA
Frenehard et Michaux SAS
Original Assignee
ETS FRENEHARD ET MICHAUX SA
Frenehard et Michaux SAS
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 ETS FRENEHARD ET MICHAUX SA, Frenehard et Michaux SAS filed Critical ETS FRENEHARD ET MICHAUX SA
Publication of EP0974171A1 publication Critical patent/EP0974171A1/en
Withdrawn legal-status Critical Current

Links

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
    • H01R4/58—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 characterised by the form or material of the contacting members
    • H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
    • 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

Definitions

  • the present invention relates to a ground rod with direct drive, its manufacturing process and a self-locking lug for connecting a first electrical conductor, in particular a ground rod, to a second electrical conductor.
  • a grounding rod by direct driving comprising a plurality of elongated bars having at one end a coaxial blind hole and at the opposite end, a coaxial portion of smaller diameter, with a lateral oletted surface, ending by a smooth conical point intended to sink into the ground or to force fit into the corresponding blind hole of another similar bar to lengthen the stake.
  • each rod of the stake must be machined and knurled to form the point of penetration, and the knurling press fitting.
  • this tip must be hardened, the whole bar must be made of high-strength steel because the tip is integral with the rest of the bar.
  • the bar is subjected to a galvanization which has the effect of sealing the knurling of the tip, which requires cleaning it to unclog it and recalibrating it to allow the tight fit fitting. between two rods of the stake.
  • the subject of the invention is a direct grounding earth stake, comprising at least one elongated element having a blind hole at one end and a knurled portion with a point at the opposite end, said knurled portion with a point being intended to sink into the ground or to be forced into the corresponding blind hole of another similar element to lengthen the stake, characterized in that said knurled portion at the point of each element is a separate part of the 'element and each element of the stake has a blind hole at its two ends for forcibly receiving said separate piece.
  • said separate part forms a generally knurled symmetrical pin on its lateral surface with the exception of its two ends which end in a smooth conical point.
  • the knurling can consist of small pyramidal projections.
  • each elongated element is made of stainless steel, copper or copper-plated steel.
  • the elongated elements can be made of hot-dip galvanized steel.
  • each separate part is made of high-strength steel, electro-galvanized to protect it against corrosion.
  • the electrogalvanizing can here be advantageously applied to the separate part because the latter is of reduced size and the electrogalvanizing does not have the effect of clogging the knurling.
  • the invention also relates to an automated manufacturing process for the aforementioned stake, characterized in that it consists:
  • the invention also relates to a self-locking terminal for connecting a first electrical conductor, in particular the aforementioned stake, to a second electrical conductor, characterized in that it comprises a yoke whose two substantially parallel branches are provided with an oblong opening, through which oblong openings is intended to be inserted the aforementioned first conductor, a nut embedded between the two branches of the yoke to immobilize the rotating nut, a clamping screw intended to pass through a hole in the bottom of the yoke and in the nut to press against the first conductor, and a support piece inserted through the two aforementioned openings so as to extend between the two branches and thus close the open end of the yoke, so that the second conductor is clamped between said support piece and the first conductor during screwing.
  • this support piece is a substantially semi-cylindrical sheet metal piece matching the corresponding shape of the end portion of the openings of the yoke.
  • This piece of sheet metal can be accommodated in a corresponding counterbore made in said end portion of each opening.
  • This portion of sheet metal may have at each longitudinal end an externally folding tab on the branches of the yoke to fix said part in place.
  • Figure 1 is a longitudinal elevational view of an earth stake according to the invention.
  • FIG. 2 is a view of the pin alone of the stake of FIG. 1.
  • Figure 3 is a schematic view of an earth stake associated with a terminal lug to a grounding cable.
  • FIG. 4 is an enlarged view of the upper end of the stake of FIG. 3.
  • Figure 5 shows the support part of the terminal of Figure 4.
  • FIG. 6 is a top view of FIG. 4.
  • Figure 7 shows the support part of the terminal of Figure 6.
  • the stake of the invention comprises one or more elongated circular cylindrical bars 1 and a separate cylindrical pin 2 associated with each of the bars 1.
  • Each straight bar 1 has at one end a coaxial blind hole 3 and at the opposite end a tapered chamfered portion 4 which also has a corresponding coaxial blind hole 5.
  • This bar 1 can be made of copper or copper-plated steel, which makes it possible to do without galvanizing, or stainless steel, in which case the bar is hot dip galvanized.
  • Each spindle 2 has a knurled cylindrical lateral surface preferably comprising multiple pyramidal projections 6, and at each longitudinal end a smooth conical or frustoconical point 7.
  • the fact of providing this perfectly symmetrical part allows it to be used in both directions and when one point is worn, e can use the other point of the same spindle.
  • This pin 2 is intended to be force fitted into one of the two blind holes 3, 5 of the associated bar 1 and one of the points 7 will be used to penetrate the stake into the ground T (see FIG. 3) or will simply be housed in a blind hole in another element.
  • FIG. 3 A two-element stake inserted into the earth T is shown in FIG. 3. This earth stake is connected to a grounding cable 8 by means of a self-locking lug 9.
  • the terminal 9 is formed by a relatively thick strip of screed with parallel branches 10 connected to each other by a flat bottom 11 whose internal face serves as a support to a polygonal nut 12, here hexagonal, over its entire bearing surface.
  • the branches 10 of the yoke 9 are sufficiently close to each other to prevent the nut 12 from turning.
  • the branches 10 each have an opening 13 aligned with each other, and through which openings 13 pass the upper end of the bar 1 of the aforementioned stake.
  • Each opening 13 has a width substantially equal to the external diameter of the bar 1 and a length substantially greater than this diameter to allow the insertion of the stripped son 14 of the sheath of the cable 8.
  • the bottom 11 of the yoke 9 has a bore 15 through which passes a clamping screw 16 also passing through the nut 12 and intended to press against the bar 1.
  • a piece of semi-cylindrical thin sheet metal 17 is embedded inside the end portion of each opening 13 to serve as a bearing surface for the wires 14 of the cable 8.
  • This piece 17 is embedded in a conjugate counterbore 18 formed in the corresponding end portion of the openings 13, so that the conducting wires 14 of the cable 8 are sandwiched between the concave internal surface of the part 17 and the convex external surface of the stake 1.
  • the part 17 is also provided at each end of its median generatrix, with a tongue 19 which can be folded out on the branches 10 of the yoke to fix the part in position on the yoke.
  • the invention is applicable to the protection of transport or distribution networks of electrical energy and of electrical systems or machines.

Abstract

The invention relates to a direct boring ground rod, comprising at least one elongated element (1) with a coaxial blind hole (3, 5) at both ends, and a pin (2) distinct from said element with a knurled lateral surface ending at its two extremities in a smooth conical point (7), intended for penetrating the earth (T) or wedging into the corresponding blind hole of another similar element. The invention can be applied notably to the protection of transportation or electrical energy distribution networks, or of electric machines or systems.

Description

"Piquet de prise de terre à fonçage direct, son procédé de fabrication et cosse autobloquante pour raccorder notamment ce piquet à un conducteur électrique" ."Direct drive earth stake, its manufacturing process and self-locking terminal to connect this stake in particular to an electrical conductor".
La présente invention concerne un piquet de prise de terre à fonçage direct, son procédé de fabrication et une cosse autobloquante pour raccorder un premier conducteur électrique, en particulier un piquet de prise de terre, à un second conducteur électrique.The present invention relates to a ground rod with direct drive, its manufacturing process and a self-locking lug for connecting a first electrical conductor, in particular a ground rod, to a second electrical conductor.
On connaît déjà un piquet de mise à la terre par fonçage direct, comportant une pluralité de barres allongées présentant à une extrémité un trou borgne coaxial et à l'extrémité opposée, une portion coaxiale de diamètre plus petit, à surface latérale oletée, se terminant par une pointe conique lisse destinée à s'enfoncer dans la terre ou à s'emmancher à force dans le trou borgne correspondant d'une autre barre analogue pour allonger le piquet.There is already known a grounding rod by direct driving, comprising a plurality of elongated bars having at one end a coaxial blind hole and at the opposite end, a coaxial portion of smaller diameter, with a lateral oletted surface, ending by a smooth conical point intended to sink into the ground or to force fit into the corresponding blind hole of another similar bar to lengthen the stake.
Toutefois, chaque barre du piquet doit être usinée et moletée pour former la pointe de pénétration, et le moletage d'emmanchement à force. En outre, comme cette pointe doit être trempée, toute la barre doit être en acier à haute résistance car la pointe fait corps avec le reste de la barre.However, each rod of the stake must be machined and knurled to form the point of penetration, and the knurling press fitting. In addition, as this tip must be hardened, the whole bar must be made of high-strength steel because the tip is integral with the rest of the bar.
En outre, pour protéger la barre de la corrosion, la barre est soumise à une galvanisation qui a pour effet de colmater le moletage de la pointe, ce qui nécessite de la nettoyer pour le décolmater et le recalibrer pour permettre l'emmanchement à ajustement serré entre deux barres du piquet .In addition, to protect the bar from corrosion, the bar is subjected to a galvanization which has the effect of sealing the knurling of the tip, which requires cleaning it to unclog it and recalibrating it to allow the tight fit fitting. between two rods of the stake.
L'invention a donc pour but d'éliminer les inconvénients précités et de proposer un nouveau piquet de prise de terre à fonçage direct. A cet effet, l'invention a pour objet un piquet de prise de terre à fonçage direct, comportant au moins un élément allongé présentant un trou borgne à une extrémité et une portion moletée à pointe à l'extrémité opposée, ladite portion moletée à pointe étant destinée à s'enfoncer dans la terre ou à s'emmancher à force dans le trou borgne correspondant d'un autre élément analogue pour allonger le piquet, caractérisé en ce que ladite portion moletée à pointe de chaque élément est une pièce distincte de l'élément et chaque élément du piquet présente un trou borgne à ses deux extrémités pour recevoir à force ladite pièce distincte. Ainsi, lorsque la pointe est usée ou détériorée, il suffit de remplacer la pièce moletée, sans interférer avec le reste de l'élément.The invention therefore aims to eliminate the aforementioned drawbacks and to propose a new earth rod with direct drive. To this end, the subject of the invention is a direct grounding earth stake, comprising at least one elongated element having a blind hole at one end and a knurled portion with a point at the opposite end, said knurled portion with a point being intended to sink into the ground or to be forced into the corresponding blind hole of another similar element to lengthen the stake, characterized in that said knurled portion at the point of each element is a separate part of the 'element and each element of the stake has a blind hole at its two ends for forcibly receiving said separate piece. Thus, when the tip is worn or deteriorated, it suffices to replace the knurled part, without interfering with the rest of the element.
En particulier, ladite pièce distincte forme une broche symétrique généralement moletée sur sa surface latérale à l'exception de ses deux extrémités qui se terminent en pointe conique lisse. Le moletage peut être constitué de petites saillies pyramidales.In particular, said separate part forms a generally knurled symmetrical pin on its lateral surface with the exception of its two ends which end in a smooth conical point. The knurling can consist of small pyramidal projections.
Selon une autre caractéristique, chaque élément allongé est en acier inoxydable, en cuivre ou en acier cuivré. Les éléments allongés peuvent être en acier galvanisé à chaud au trempé.According to another characteristic, each elongated element is made of stainless steel, copper or copper-plated steel. The elongated elements can be made of hot-dip galvanized steel.
Selon encore une autre caractéristique, chaque pièce distincte est en acier à haute résistance, électrozinguée pour la protéger contre la corrosion. L' électrozingage peut être ici avantageusement appliqué à la pièce distincte car celle-ci est de taille réduite et 1 ' électrozingage n'a pas pour effet de colmater le moletage. L'invention a également pour objet un procédé de fabrication automatisé du piquet précité, caractérisé en ce qu'il consiste :According to yet another characteristic, each separate part is made of high-strength steel, electro-galvanized to protect it against corrosion. The electrogalvanizing can here be advantageously applied to the separate part because the latter is of reduced size and the electrogalvanizing does not have the effect of clogging the knurling. The invention also relates to an automated manufacturing process for the aforementioned stake, characterized in that it consists:
à découper, à longueur, des tronçons de barre, à chanfreiner chaque tronçon à une extrémité, à galvaniser chaque tronçon à chaud au trempé lorsque la barre est en acier, à percer un trou borgne à chaque extrémité des tronçons, à usiner et à moleter chaque pièce distincte, éventuellement à traiter thermiquement chaque pièce distincte, et à électrozinguer chaque pièce distincte.cutting, to length, bar sections, chamfering each section at one end, hot-dip galvanizing each section when the bar is made of steel, drilling a blind hole at each end of the sections, machining and knurling each separate part, possibly heat treating each separate part, and electrogalvanizing each separate part.
L'invention vise également une cosse autobloquante pour raccorder un premier conducteur électrique, en particulier le piquet précité, à un second conducteur électrique, caractérisée en ce qu'elle comprend une chape dont les deux branches sensiblement parallèles sont munies d'une ouverture oblongue, à travers lesquelles ouvertures oblongues est destiné à être inséré le premier conducteur précité, un écrou encastré entre les deux branches de la chape pour immobiliser l'écrou en rotation, une vis de serrage destinée à passer à travers un perçage dans le fond de la chape et dans l'écrou pour s'appuyer contre le premier conducteur, et une pièce d'appui insérée à travers les deux ouvertures précitées de façon à s'étendre entre les deux branches et à fermer ainsi l'extrémité ouverte de la chape, de sorte que le second conducteur soit enserré entre ladite pièce d'appui et le premier conducteur lors du vissage.The invention also relates to a self-locking terminal for connecting a first electrical conductor, in particular the aforementioned stake, to a second electrical conductor, characterized in that it comprises a yoke whose two substantially parallel branches are provided with an oblong opening, through which oblong openings is intended to be inserted the aforementioned first conductor, a nut embedded between the two branches of the yoke to immobilize the rotating nut, a clamping screw intended to pass through a hole in the bottom of the yoke and in the nut to press against the first conductor, and a support piece inserted through the two aforementioned openings so as to extend between the two branches and thus close the open end of the yoke, so that the second conductor is clamped between said support piece and the first conductor during screwing.
Selon une autre caractéristique de l'invention, cette pièce d'appui est une pièce de tôle sensiblement semi-cylindrique épousant la forme correspondante de la portion extrême des ouvertures de la chape. Cette pièce de tôle peut être logée dans un lamage correspondant ménagé dans ladite portion extrême de chaque ouverture. Cette portion de tôle peut présenter à chaque extrémité longitudinale une languette extérieurement rabattable sur les branches de la chape pour fixer en place ladite pièce.According to another characteristic of the invention, this support piece is a substantially semi-cylindrical sheet metal piece matching the corresponding shape of the end portion of the openings of the yoke. This piece of sheet metal can be accommodated in a corresponding counterbore made in said end portion of each opening. This portion of sheet metal may have at each longitudinal end an externally folding tab on the branches of the yoke to fix said part in place.
L'invention sera mieux comprise, et d'autres buts, détails, caractéristiques et avantages de celle-ci apparaîtront plus clairement au cours de la description détaillée explicative qui va suivre d'un mode de réalisation particulier actuellement préféré de l'invention, donné uniquement à titre illustratif et non limitatif, en référence aux dessins schématiques annexés, dans lequels :The invention will be better understood, and other objects, details, characteristics and advantages thereof will appear more clearly during the detailed explanatory description which will follow of a particular currently preferred embodiment of the invention, given only for illustration and not limitation, with reference to the appended schematic drawings, in which:
La figure 1 est une vue en élévation longitudinale d'un piquet de prise de terre selon l'invention.Figure 1 is a longitudinal elevational view of an earth stake according to the invention.
La figure 2 est une vue de la broche seule du piquet de la figure 1.FIG. 2 is a view of the pin alone of the stake of FIG. 1.
La figure 3 est une vue schématique d'un piquet de prise de terre associé à une cosse de raccordement à un câble de mise à la terre.Figure 3 is a schematic view of an earth stake associated with a terminal lug to a grounding cable.
La figure 4 est une vue agrandie de l'extrémité supérieure du piquet de la figure 3.FIG. 4 is an enlarged view of the upper end of the stake of FIG. 3.
La figure 5 montre la pièce d'appui de la cosse de la figure 4.Figure 5 shows the support part of the terminal of Figure 4.
La figure 6 est une vue de dessus de la figure 4.FIG. 6 is a top view of FIG. 4.
La figure 7 montre la pièce d'appui de la cosse de la figure 6. Selon l'exemple de réalisation représenté sur les dessins, le piquet de l'invention comporte une ou plusieurs barres allongées cylindriques circulaires 1 et une broche cylindrique distincte 2 associée à chacune des barres 1.Figure 7 shows the support part of the terminal of Figure 6. According to the embodiment shown in the drawings, the stake of the invention comprises one or more elongated circular cylindrical bars 1 and a separate cylindrical pin 2 associated with each of the bars 1.
Chaque barre rectiligne 1 présente à une extrémité un trou borgne coaxial 3 et à l'extrémité opposée une portion chanfreinée tronconique 4 qui comporte également un trou borgne coaxial correspondant 5. Cette barre 1 peut être en cuivre ou en acier cuivré, ce qui permet de se passer de la galvanisation, ou en acier inoxydable, dans lequel cas, la barre est galvanisée à chaud au trempé.Each straight bar 1 has at one end a coaxial blind hole 3 and at the opposite end a tapered chamfered portion 4 which also has a corresponding coaxial blind hole 5. This bar 1 can be made of copper or copper-plated steel, which makes it possible to do without galvanizing, or stainless steel, in which case the bar is hot dip galvanized.
Chaque broche 2 présente une surface latérale cylindrique moletée comportant de préférence de multiples saillies pyramidales 6, et à chaque extrémité longitudinale une pointe conique ou tronconique lisse 7. Le fait de prévoir cette pièce parfaitement symétrique, permet de l'utiliser indifféremment dans les deux sens et lorsqu'une pointe est usée, e peut utiliser l'autre pointe de la même broche.Each spindle 2 has a knurled cylindrical lateral surface preferably comprising multiple pyramidal projections 6, and at each longitudinal end a smooth conical or frustoconical point 7. The fact of providing this perfectly symmetrical part allows it to be used in both directions and when one point is worn, e can use the other point of the same spindle.
Cette broche 2 est destinée à s'emmancher à force dans l'un des deux trous borgnes 3, 5 de la barre associée 1 et l'une des pointes 7 servira à la pénétration du piquet dans la terre T (voir figure 3) ou sera simplement logée dans un trou borgne d'un autre élément.This pin 2 is intended to be force fitted into one of the two blind holes 3, 5 of the associated bar 1 and one of the points 7 will be used to penetrate the stake into the ground T (see FIG. 3) or will simply be housed in a blind hole in another element.
Les divers éléments d'un même piquet sont destinés à être emmanchés l'un dans l'autre par chocs répétés. Un piquet à deux éléments enfoncé dans la terre T est représenté sur la figure 3. Ce piquet de prise de terre est connecté à un câble de mise à la terre 8 par l'intermédiaire d'un cosse autobloquante 9.The various elements of the same stake are intended to be fitted into one another by repeated impacts. A two-element stake inserted into the earth T is shown in FIG. 3. This earth stake is connected to a grounding cable 8 by means of a self-locking lug 9.
La cosse 9 est formée par une chape en feuillard relativement épais à branches parallèles 10 reliées entre elles par un fond plat 11 dont la face interne sert d'appui à un écrou polygonal 12, ici hexagonal, sur toute sa surface portante. Les branches 10 de la chape 9 sont suffisamment rapprochées l'une de l'autre pour empêcher l'écrou 12 de tourner.The terminal 9 is formed by a relatively thick strip of screed with parallel branches 10 connected to each other by a flat bottom 11 whose internal face serves as a support to a polygonal nut 12, here hexagonal, over its entire bearing surface. The branches 10 of the yoke 9 are sufficiently close to each other to prevent the nut 12 from turning.
Les branches 10 présentent chacune une ouverture 13 alignée l'une avec l'autre, et à travers lesquelles ouvertures 13 passe l'extrémité supérieure de la barre 1 du piquet précité. Chaque ouverture 13 présente une largeur sensiblement égale au diamètre externe de la barre 1 et une longueur sensiblement supérieure à ce diamètre pour permettre l'insertion des fils conducteurs 14 dénudés de la gaine du câble 8.The branches 10 each have an opening 13 aligned with each other, and through which openings 13 pass the upper end of the bar 1 of the aforementioned stake. Each opening 13 has a width substantially equal to the external diameter of the bar 1 and a length substantially greater than this diameter to allow the insertion of the stripped son 14 of the sheath of the cable 8.
Le fond 11 de la chape 9 comporte un perçage 15 à travers lequel passe une vis de serrage 16 traversant également l'écrou 12 et destinée à venir appuyer contre la barre 1.The bottom 11 of the yoke 9 has a bore 15 through which passes a clamping screw 16 also passing through the nut 12 and intended to press against the bar 1.
Une pièce de tôle fine semi-cylindrique 17 est encastrée à l'intérieur de la portion extrême de chaque ouverture 13 pour servir de surface d'appui aux fils 14 du câble 8. Cette pièce 17 est encastrée dans un lamage conjugué 18 ménagé dans la portion extrême correspondante des ouvertures 13, de façon que les fils conducteurs 14 du câble 8 soient enserrés entre la surface interne concave de la pièce 17 et la surface externe convexe du piquet 1.A piece of semi-cylindrical thin sheet metal 17 is embedded inside the end portion of each opening 13 to serve as a bearing surface for the wires 14 of the cable 8. This piece 17 is embedded in a conjugate counterbore 18 formed in the corresponding end portion of the openings 13, so that the conducting wires 14 of the cable 8 are sandwiched between the concave internal surface of the part 17 and the convex external surface of the stake 1.
La pièce 17 est également munie à chaque extrémité de sa génératrice médiane, d'une languette 19 rabattable extérieurement sur les branches 10 de la chape pour fixer en position la pièce sur la chape.The part 17 is also provided at each end of its median generatrix, with a tongue 19 which can be folded out on the branches 10 of the yoke to fix the part in position on the yoke.
On comprend donc que par vissage de la vis 16, les fils conducteurs 14 interposés entre le piquet 1 et la face semi-circulaire de la pièce 17 seront serrés en établissant un bon contact de conduction électrique, mais sans risque de sectionner les fils 14 en raison de la grande surface d'appui de ces fils.It is therefore understood that by screwing the screw 16, the conductive wires 14 interposed between the stake 1 and the semi-circular face of the part 17 will be tightened by establishing a good electrical conduction contact, but without risk to cut the wires 14 due to the large bearing surface of these wires.
L'invention est applicable à la protection de réseaux de transport ou de distribution d'énergie électrique et de systèmes ou machines électriques.The invention is applicable to the protection of transport or distribution networks of electrical energy and of electrical systems or machines.
Bien que l'invention ait été décrite en liaison avec un mode de réalisation particulier, il est bien évident qu'elle n'y est nullement limitée et qu'elle comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci entrent dans le cadre de 1 ' invention. Although the invention has been described in connection with a particular embodiment, it is obvious that it is in no way limited thereto and that it includes all the technical equivalents of the means described as well as their combinations if these fall within the scope of one invention.

Claims

Revendications claims
1. Piquet de prise de terre à fonçage direct, comportant au moins un élément allongé (1) présentant un trou borgne (3) à une extrémité et une portion moletée à pointe (2) à l'extrémité opposée, ladite portion moletée à pointe étant destinée à s'enfoncer dans la terre (T) ou à s'emmancher à force dans le trou borgne correspondant (3) d'un autre élément analogue (6) pour allonger le piquet, caractérisé en ce que ladite portion moletée à pointe de chaque élément est une pièce (2) distincte de l'élément (1) qui forme une broche symétrique (2) généralement moletée sur sa surface latérale (6) à l'exception de ses deux extrémités (7) qui se terminent en pointe conique lisse, et chaque élément du piquet présente un trou borgne (3, 5) à ses deux extrémités pour recevoir à force ladite pièce distincte (2) .1. Direct drive earth stake, comprising at least one elongated element (1) having a blind hole (3) at one end and a knurled portion with point (2) at the opposite end, said knurled portion with point being intended to sink into the ground (T) or to be forced into the corresponding blind hole (3) of another similar element (6) to lengthen the stake, characterized in that said knurled portion with a point of each element is a part (2) distinct from the element (1) which forms a symmetrical pin (2) generally knurled on its lateral surface (6) with the exception of its two ends (7) which end in a point smooth conical, and each element of the stake has a blind hole (3, 5) at its two ends for forcibly receiving said separate piece (2).
2. Piquet selon la revendication 1, caractérisé en ce que le moletage est constitué de petites saillies pyramidales (6) .2. stake according to claim 1, characterized in that the knurling consists of small pyramidal projections (6).
3. Piquet selon la revendication 1 ou 2, caractérisé en ce que chaque élément allongé (1) est en acier inoxydable, en cuivre ou en acier cuivré.3. Post according to claim 1 or 2, characterized in that each elongated element (1) is made of stainless steel, copper or copper-plated steel.
4. Piquet selon la revendication 3, caractérisé en ce que chaque élément allongé est en acier galvanisé à chaud au trempé.4. Post according to claim 3, characterized in that each elongated element is made of hot-dip galvanized steel.
5. Piquet selon l'une des revendications précédentes, caractérisé en ce que chaque pièce distincte (2) est en acier à haute résistance et électrozinguée .5. Post according to one of the preceding claims, characterized in that each separate part (2) is made of high-strength steel and electrogalvanized.
6. Procédé de fabrication du piquet selon l'une des revendications précédentes, consistant à découper, à longueur, des tronçons de barre (1) et à chanfreiner chaque tronçon à une extrémité (4), caractérisé en ce qu'il consiste en outre :6. Method of manufacturing the stake according to one of the preceding claims, consisting of cutting, length, bar sections (1) and to chamfer each section at one end (4), characterized in that it further consists:
à galvaniser chaque tronçon à chaud au trempé lorsque la barre est en acier, à percer un trou borgne (3, 5) à chaque extrémité des tronçons (1) , à usiner et à moleter chaque pièce distincte (2) , éventuellement à traiter thermiquement chaque pièce distincte (2) , et à électrozinguer chaque pièce distincte (2) .to hot-dip galvanize each section when the bar is made of steel, to drill a blind hole (3, 5) at each end of the sections (1), to machine and knead each separate part (2), possibly to be heat treated each separate part (2), and electrogalvanizing each separate part (2).
7. Cosse autobloquante pour raccorder un premier conducteur électrique, en particulier le piquet selon l'une des revendications 1 à 5, à un second conducteur électrique (8), comprenant une chape (9) dont les deux branches sensiblement parallèles (10) sont munies d'une ouverture oblongue (13), à travers lesquelles ouvertures oblongues est destiné à être inséré le premier conducteur précité7. Self-locking lug for connecting a first electrical conductor, in particular the stake according to one of claims 1 to 5, to a second electrical conductor (8), comprising a yoke (9) whose two substantially parallel branches (10) are provided with an oblong opening (13), through which oblong openings is intended to insert the first aforementioned conductor
(1), caractérisée en ce qu'elle comprend également un écrou(1), characterized in that it also includes a nut
(12) encastré entre les deux branches de la chape pour immobiliser l'écrou en rotation, une vis de serrage (16) destinée à passer à travers un perçage (15) dans le fond (11) de la chape et dans l'écrou (12) pour s'appuyer contre le premier conducteur (1), et une pièce d'appui (17) insérée à travers les deux ouvertures précitées (13) de façon à s'étendre entre les deux branches, de sorte que le second conducteur (8, 14) soit enserré entre ladite pièce d'appui (17) et le premier conducteur (1) lors du vissage.(12) embedded between the two branches of the yoke to immobilize the rotating nut, a clamping screw (16) intended to pass through a bore (15) in the bottom (11) of the yoke and in the nut (12) for pressing against the first conductor (1), and a support piece (17) inserted through the two aforementioned openings (13) so as to extend between the two branches, so that the second conductor (8, 14) is clamped between said support piece (17) and the first conductor (1) during screwing.
8. Cosse selon la revendication 7, caractérisée en ce que ladite pièce d'appui (17) est une pièce de tôle sensiblement semi-cylindrique épousant la forme correspondante de la portion extrême des ouvertures (13) de la chape. 8. Lug according to claim 7, characterized in that said support piece (17) is a substantially semi-cylindrical sheet metal piece matching the corresponding shape of the end portion of the openings (13) of the yoke.
9. Cosse selon la revendication 7 ou 8, caractérisée en ce que ladite pièce d'appui (17) est logée dans un lamage correspondant (18) ménagé dans ladite portion extrême de chaque ouverture (13).9. Terminal according to claim 7 or 8, characterized in that said support piece (17) is housed in a corresponding counterbore (18) formed in said end portion of each opening (13).
10. Cosse selon l'une des revendications 7 à 9, caractérisée en ce que la pièce d'appui (17) présente à chaque extrémité longitudinale une languette (19) extérieurement rabattable sur les branches (10) de la chape (9) pour fixer en place ladite pièce. 10. Terminal according to one of claims 7 to 9, characterized in that the support piece (17) has at each longitudinal end a tongue (19) externally foldable on the branches (10) of the yoke (9) for fix in place said piece.
EP98917277A 1997-04-09 1998-03-31 Direct boring ground rod, process for its manufacture, and self-locking lug for connecting notably this rod to an electrical conductor Withdrawn EP0974171A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9704357A FR2762144B1 (en) 1997-04-09 1997-04-09 DIRECT-DRIVEN EARTHING POLE, MANUFACTURING METHOD THEREOF, AND SELF-LOCKING TERMINAL FOR PARTICULARLY CONNECTING THIS POLE TO AN ELECTRICAL CONDUCTOR
FR9704357 1997-04-09
PCT/FR1998/000650 WO1998045895A1 (en) 1997-04-09 1998-03-31 Direct boring ground rod, process for its manufacture, and self-locking lug for connecting notably this rod to an electrical conductor

Publications (1)

Publication Number Publication Date
EP0974171A1 true EP0974171A1 (en) 2000-01-26

Family

ID=9505697

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98917277A Withdrawn EP0974171A1 (en) 1997-04-09 1998-03-31 Direct boring ground rod, process for its manufacture, and self-locking lug for connecting notably this rod to an electrical conductor

Country Status (3)

Country Link
EP (1) EP0974171A1 (en)
FR (1) FR2762144B1 (en)
WO (1) WO1998045895A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2790333B1 (en) * 1999-02-26 2001-04-27 Frenehard & Michaux Sa TERMINAL FOR CONNECTING AN ELECTRICALLY CONDUCTIVE CABLE TO AN EARTHING POLE AND METHOD FOR MANUFACTURING SUCH A TERMINAL
WO2001033671A1 (en) * 1999-11-01 2001-05-10 Turgeon, Lynn Grounding method and associated pole support system
AT5503U1 (en) 2001-03-08 2002-07-25 Lem Norma Gmbh DEVICE TO SUPPORT EARTH RESISTANCE MEASUREMENT
CN104253323B (en) * 2013-08-08 2016-08-17 国家电网公司 A kind of earth lead operation device

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Publication number Priority date Publication date Assignee Title
SE325463B (en) * 1965-07-07 1970-06-29 Kobe Steel Ltd
GB1218781A (en) * 1968-06-06 1971-01-13 Australian Insulator Ironworks Earthing electrode
FR2397137A7 (en) * 1977-07-06 1979-02-02 Graipin Raymond Direct connection earthing spike - has body with threaded pointed head and bore at opposite ends
FR2397138A7 (en) * 1977-07-07 1979-02-02 Graipin Raymond Coupling shell for earthing plate - consists of sleeve with aperture to receive bolt whose nut bears on sleeve inner surfaces
FR2476920A1 (en) * 1980-02-25 1981-08-28 Graipin Raymond Lightning conductor stake - has fluted walls inscribing circle proportioned for optimum buckling strength and may be extended by end to end joining
DE8500148U1 (en) * 1985-01-05 1985-04-04 OBO Bettermann oHG, 5750 Menden Device for equipotential bonding for earth conductors in electrical installations
NL9100147A (en) * 1991-01-28 1992-08-17 Aarding Non Ferro Werk Bv METHOD FOR MANUFACTURING A GROUND ELECTRODE
US5361657A (en) * 1991-08-15 1994-11-08 Terry Elliott P Drive socket

Non-Patent Citations (1)

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Title
See references of WO9845895A1 *

Also Published As

Publication number Publication date
FR2762144B1 (en) 1999-06-25
WO1998045895A1 (en) 1998-10-15
FR2762144A1 (en) 1998-10-16

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