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.

Landscapes

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

Applications Claiming Priority (3)

Publications (1)

Family

ID=9505697

Family Applications (1)

Country Status (3)

Families Citing this family (4)

Family Cites Families (8)

• 1997
  • 1997-04-09 FR FR9704357A patent/FR2762144B1/fr not_active Expired - Fee Related
• 1998
  • 1998-03-31 WO PCT/FR1998/000650 patent/WO1998045895A1/fr not_active Application Discontinuation
  • 1998-03-31 EP EP98917277A patent/EP0974171A1/de not_active Withdrawn

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events