Fences – Electric
Patent
1997-06-13
1999-09-28
Knight, Anthony
Fences
Electric
256 45, A01K 300, E04H 1710
Patent
active
059574348
DESCRIPTION:
BRIEF SUMMARY
Electric fences for enclosed pasture-land are previously known and appreciated for being simple and effective. They consist of a grounded mains- or battery-operated pulse generator for high voltage and low power and, connected thereto, a smooth metallic wire which is carried by insulating poles so as to surround the enclosed pasture-land. At first contact with the wire the domestic animals learn that it gives an unpleasant electric shock and thereafter avoid subsequent contact. To date simple stainless metallic wire has been used as wire material, in more sophisticated applications woven into a thin ribbon, which makes it more visible. The previously known type of electric fences have however, a considerable disadvantage. Young domestic animals which have not yet come into contact with the electric fence often approach it with such a speed that they are not restricted by the electric shock before the wire has already been torn off by their rush. The same situation applies to wild animals striving to pass the fence and not being aware of its effect. This way openings in the fence will occur and the cattle will scatter before the owner has observed the damage. The animals may then destroy valuable cultivations and cause work and trouble for the owner. The invention is a safe and economic solution to this and other problems. It is mainly characterized in that one or more electrically conductive wires are associated with an elastic material in such a way that the wires and the material together form a considerably but restricted and elastically stretchable string, which is electrically conductive at least on parts of its surface, and which together with the poles comprise the enclosure.
The invention will now be described by way of an embodiment according to the annexed drawing, wherein
FIG. 1 shows a section of the string
FIG. 2 shows the string in a side view
FIG. 3 shows a portion of the enclosure
FIG. 4 shows a portion of the enclosure in a horizontal section.
According to FIG. 1 an elastic and electrically conductive string is formed around a synthetic rubber core 1 which preferably is divided into several treads, an envelope of tubular braided plastic threads 2 and a number of metal threads 3 included in the braid. The plastic material is preferably a high quality polyamide, e.g. one being known under the commercial denomination 6006, and is treated against UV-radiation degradation. The metallic thread is comprised of stainless steel with a diameter of 0.15-0.3 mm. The tubular braid allows the string to be stretched out to the length where the plastic threads 2 lie against each other in an almost longitudinal direction and it is dimensioned such with respect to the core 1 that the latter thereby is stretched to about two times its length in the state of rest. The outer diameter of the string is about 4 mm in its state of rest. A string which is formed in such a way is electrically conductive by the metallic threads being braided into its surface and is elastically stretchable because of the association between the rubber core and the braided envelope, but the stretchability is restricted by the lengths of the plastic threads. In order to secure the association between the core and the envelope, the string should be provided with a knot near all free ends. The properties of the string makes it ideal for replacing previously used metallic wires and ribbons in electric fences. It is thereby preferably hung on a post according to FIG. 3 which is comprised of a piece of a thin X-profile 5 of carbon fibre reinforced plastic material and which is provided with a pointed end 6 for pressing down into the ground and a movable attachment means 7 for the string. The attachment means 7 has the same shape as a boat anchor and is positioned obliquely with respect to the profile 5 in order to allow it to be hooked together with a similar attachment means of a neighbouring post of the same type as is illustrated on FIG. 4. The purpose of this is to provide the easiest way of arranging an easily opened place in the fence.
REFERENCES:
patent: 3291897 (1966-12-01), Bramley
patent: 4077611 (1978-03-01), Wilson
patent: 4845317 (1989-07-01), Wilson, Jr.
Knight Anthony
Nordberg Fred
Pickard Alison
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