EP1566818A1 - Isolateur pour une clôture et procédé de fabrication. - Google Patents

Isolateur pour une clôture et procédé de fabrication. Download PDF

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Publication number
EP1566818A1
EP1566818A1 EP05075371A EP05075371A EP1566818A1 EP 1566818 A1 EP1566818 A1 EP 1566818A1 EP 05075371 A EP05075371 A EP 05075371A EP 05075371 A EP05075371 A EP 05075371A EP 1566818 A1 EP1566818 A1 EP 1566818A1
Authority
EP
European Patent Office
Prior art keywords
passage
bushing
insulating body
reinforcing structure
circumference
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.)
Granted
Application number
EP05075371A
Other languages
German (de)
English (en)
Other versions
EP1566818B1 (fr
Inventor
Lambertus Jan Pezij
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.)
Handelsonderneming Veldman en Dijkstra BV
Original Assignee
Handelsonderneming Veldman en Dijkstra BV
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 Handelsonderneming Veldman en Dijkstra BV filed Critical Handelsonderneming Veldman en Dijkstra BV
Publication of EP1566818A1 publication Critical patent/EP1566818A1/fr
Application granted granted Critical
Publication of EP1566818B1 publication Critical patent/EP1566818B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/14—Supporting insulators
    • H01B17/145—Insulators, poles, handles, or the like in electric fences
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/20—Pin insulators

Definitions

  • the invention relates to an insulator according to the introductory portions of claims 1 and 10 and to a fence provided with such insulators and to a method for the manufacture of such an insulator.
  • An insulator as indicated hereinabove for holding fencing material such as wire, rope or tape in position relative to a supporting structure is known from practice.
  • Insulators are important parts of an electric fence. Poor electric insulation of the conductors of the fence may entail voltage loss in that a leakage current towards the ground is formed and that, at such a current intensity, the fence device (the electrical voltage source for applying a voltage across conductors of the fencing material) cannot keep the voltage at a sufficiently high level. Such leakage currents also lead to energy loss which, in practice, is particularly disadvantageous when a battery is used as a power supply.
  • a first cause of leakage currents is that the insulating body wears down through abrasion so that the metal reinforcing structure of the insulator material is exposed and comes into contact with a conductor of the fencing material. As this phenomenon occurs in the passage of the insulating body, it is difficult to detect without electric circuit testing of the conductors of the fencing material or extensive visual inspection of the insulator.
  • Another cause of the formation of leakage currents is that, due to an incorrect positioning in the insulating body, the metal reinforcing structure is exposed adjacent the passage, or is at least so close to the surface that it is already exposed with very little wear. This may have been caused with, for instance, a metal reinforcing structure with an eye extending around at least a part of the circumference of the passage, in that, with respect to the intended position in a plane transverse to the central axis of the passage, the metal reinforcing structure is rotated about the central axis of the stem of the metal reinforcing structure.
  • this object is achieved by providing an insulator according to claim 1.
  • a ring insulator according to claim 10 is provided.
  • the invention can also be embodied in a method according to claim 12, with which, with great reliability, insulators with a long lasting, highly insulating effect are obtained.
  • the bushing from electrical insulating material extends around at least a part of the circumference of the passage, it is reliably ensured that the thickness of the insulating material in the area where, in operative condition, the insulating material insulates the conductors of the fence from the metal of the reinforcing structure, has the intended thickness.
  • the bushing which, during manufacture, is placed over a core part of the mold, effects in a simple manner the intended positioning of the metal reinforcing structure in the mold prior to and during injection of the insulating material of the insulating body and functions as spacer which guarantees that the metal reinforcement structure is held at a sufficient distance from the passage.
  • the marking which marks a boundary which extends radially at a distance outside the circumference of the passage and around at least a part of the circumference of the passage, simplifies, as wear-indicator, observing the degree of wear of the insulating body at the inside of the passage in relation to the position of the metal reinforcing structure and in relation to the minimum thickness of the insulation body that still ensures a sufficiently reliable positioning of the fencing material.
  • FIG. 1 The Figures show an example of an insulator 1 for holding in position relative to a supporting structure 2 - somewhat schematically represented as a part of a post in Fig. 1 - fencing material 3 such as wire, rope or tape provided with at least one electrical conductor over which an electric voltage can be applied for deterring animals touching the fence.
  • fencing material 3 such as wire, rope or tape provided with at least one electrical conductor over which an electric voltage can be applied for deterring animals touching the fence.
  • the voltage should at least be 2000 Volts at 500 Ohm (approximately the resistance of an animal touching the conductor). The discharge energy is then limited so no injuries are inflicted on animals touching a conductor of the fence.
  • the electrical conductor should be insulated well with respect to the earth, because leakage currents lead to voltage loss so that the deterring effect may drop below the required level.
  • leakage currents form energy loss which is disadvantageous particularly when a battery is used as a power supply, because then, the battery empties quicker. That is why the fencing material of which the conductors form part is held in position by means of insulators. For fencing a meadow a large number of insulators are required. It is therefore of great importance that the insulators are of simple construction and can be manufactured at low costs.
  • the insulator 1 according to the exemplary embodiment of the invention shown here is provided with an insulating body 4 from electrically insulating material with a passage 5 having a circumference 6 for receiving a portion located in the passage of fencing material 3 extending through the passage.
  • the passage 5 extends in an axial passage direction (arrow 7 in Fig. 1) between opposite end surfaces 8 of the insulating body 4.
  • the insulator 1 is further provided with a metal reinforcing structure 9, provided according to this example with an eye part 10 extending around the passage 5 over at least a part of the circumference 6 of the passage 5.
  • the metal reinforcing structure 9 also forms a screw 11 (see Fig. 2) for screwing the insulator 1 into a post or the like.
  • the insulator 1, and in particular the metal reinforcing structure thereof can also be designed to be fastened in a different manner, for instance by means of screws reaching through holes in the insulator and, optionally, the metal reinforcing structure.
  • a bushing 12 from electrically insulating material extends through the eye part 10 and around a part of the circumference 6 of the passage 5.
  • a passage 13 forms an interruption of the insulating body 4, the bushing 12 included, and extends via an opening in the eye part 10 between the passage 5 and the surroundings.
  • fencing material 13 can be brought into the passage 5 with a movement in a direction at an angle relative to the passage direction 7. It is therefore not necessary to thread the fencing material through the passage 5 in the passage direction 7.
  • fencing material 3 which has been tensioned in the passage direction 7, cannot escape from the passage 5.
  • the bushing 12 is preferably manufactured from plastic, like the rest of the insulating body, and preferably from a similar kind of plastic.
  • the bushing 12 is further provided with anchorages 15 - 19. As a number of the anchorages 15 - 17 grip the metal reinforcing structure 9 on both sides, they also contribute to a mutual positioning of the metal reinforcing structure 9 and the bushing 12 in axial direction 7 of the passage 5 before the rest of the material of the insulating body 4 is injected around these parts 9, 12.
  • two of the anchorages 18, 19 extend as far as the circumference in axial view of the insulating body and are designed as flat flanges.
  • the wall thickness of the material which must solidify after it has been injected around the reinforcement structure 9 and the bushing 12 is limited and after injection around the reinforcing structure 9 and the bushing 12 has taken place, the cooling of the material in the center area of the insulating body 4 is accelerated. All this contributes to the reduction of the cycle time during injection molding.
  • the flanges 18, 19 themselves are thin-walled, they do not contribute to the increase of the cycle time.
  • the bushing 12 abuts locally against the eye part 10. This offers the advantage that prior to the formation of the insulating body 4, the bushing is held accurately in position with respect to the eye part 10 of the reinforcing structure 9.
  • the end surfaces 8 of the insulating body 4 exhibit a marking 14, marking a boundary which extends radially at a distance outside the circumference 6 of the passage 5 and around at least a part of the circumference 6 of the passage 5.
  • An outer edge of the bushing 14 marks this boundary.
  • the eye part 10 has an inside circumference located in radial direction at a distance outside this boundary.
  • the bushing 12 still has sufficient insulating action when it has worn down to the outer edges located at the location of the end surfaces 8.
  • the marking 14 forms a wear-indicator by means of which it can easily and clearly be seen whether the insulating body 4 has worn down in the area of the passage 5 to such an extent that a reliable insulation of the conductor 3 with regard to the reinforcing structure 9 is no longer ensured.
  • a marking is provided which, also with long-term exposure to influences from the surroundings, remains present in a reliable manner, also when the insulator is manufactured from material such as polyolefin plastic to which printing and stickers adhere poorly, and it is not necessary to provide a special printing or change in form for forming the marking 13.
  • the wear-indicator formed by the marking can also serve to indicate whether the insulating body is still sufficiently thick for holding the fencing material in a reliable manner in the passage through the insulating body.
  • the metal reinforcing structure 9 is placed in a mold. Prior to injecting, together with the metal reinforcing structure 9, the bushing 12 from electrically insulating material is placed in the mold too. Then, the mold is closed and plastic is injected around a part 10 of the metal reinforcing structure 9. After the plastic has solidified into a sufficiently solid form, the metal reinforcing structure 9, around whose eye part 10 the plastic insulating body 4 is provided, is taken from the mold. Prior to and during injection, the bushing 12 serves as spacer which ensures that the eye part 10 of the metal reinforcing structure 9 is located at a sufficient distance from the core part of the mold defining the location of the inner surface of the passage 5.
  • the bushing 12 is fixed with respect to the metal reinforcing structure 9, for instance by clamping. This enables the bushing 12 and the metal reinforcing structure 9 to be placed into the mold in one operation, which, in turn, is advantageous for shortening the cycle time of the injection molding.
  • the bushing 12 prevents the metal reinforcing structure 9 from being moved prior to and during injection around the reinforcing structure 9.
  • the bushing 12 substantially prevents the reinforcing structure 9 from being tilted around the central axis of the screw 11, and positioning errors and movements in axial direction of the screw 11.

Landscapes

  • Insulators (AREA)
  • Insulating Bodies (AREA)
EP05075371.4A 2004-02-20 2005-02-15 Isolateur pour une clôture et procédé de fabrication. Expired - Lifetime EP1566818B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1025536 2004-02-20
NL1025536A NL1025536C2 (nl) 2004-02-20 2004-02-20 Isolator voor een afrastering en werkwijze voor de fabricage daarvan.

Publications (2)

Publication Number Publication Date
EP1566818A1 true EP1566818A1 (fr) 2005-08-24
EP1566818B1 EP1566818B1 (fr) 2017-11-22

Family

ID=34709389

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05075371.4A Expired - Lifetime EP1566818B1 (fr) 2004-02-20 2005-02-15 Isolateur pour une clôture et procédé de fabrication.

Country Status (2)

Country Link
EP (1) EP1566818B1 (fr)
NL (1) NL1025536C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2013202111B2 (en) * 2012-03-30 2016-03-31 Gallagher Group Limited A fence standard

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9203940U1 (de) * 1992-03-24 1992-05-14 Steuer & Co. GmbH, O-9127 Wittgensdorf Isolator für Weidezaundrähte
EP0860837A2 (fr) * 1997-02-22 1998-08-26 Walter Voit Isolateur et adapteur pour fils, bandes ou torons sous tension électrique pour monter et fabriquer des clÔtures
US20020025218A1 (en) * 1999-02-23 2002-02-28 Victor Tan Insulator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9203940U1 (de) * 1992-03-24 1992-05-14 Steuer & Co. GmbH, O-9127 Wittgensdorf Isolator für Weidezaundrähte
EP0860837A2 (fr) * 1997-02-22 1998-08-26 Walter Voit Isolateur et adapteur pour fils, bandes ou torons sous tension électrique pour monter et fabriquer des clÔtures
US20020025218A1 (en) * 1999-02-23 2002-02-28 Victor Tan Insulator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2013202111B2 (en) * 2012-03-30 2016-03-31 Gallagher Group Limited A fence standard
US10170221B2 (en) 2012-03-30 2019-01-01 Gallagher Group Limited Fence standard

Also Published As

Publication number Publication date
NL1025536C2 (nl) 2005-08-23
EP1566818B1 (fr) 2017-11-22

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