JP7343888B2 - Insulator for wire overhead lines - Google Patents

Description

The present application relates to an insulator for a wire for holding a wire on a support when the wire for a pasture fence, particularly the wire for an electric pasture fence, is stretched over a slope or the like using a support such as a tree.

Conventionally, when animals are grazed on land such as pasture, fences are used to enclose the animals, such as physical net fences and electric wire fences, which are psychological fences that shock the animals with high voltage applied to the wires. A fence (called an electric fence) is required. Among these, electric wire fences involve attaching insulators for overhead lines to posts erected at predetermined intervals around the land to be fenced, and applying high voltage to energizing wires stretched around the insulators for overhead lines. It consists of

By the way, among all the costs involved in installing a fence facility, especially an electric wire fence facility, the highest cost is the installation cost of the posts. In the case of electric wire fence facilities, the cost of installing the posts on flat land, including material and labor costs, generally accounts for about 70% of the total fence installation cost. However, when installing an electric wire fence in a woodland or forest with a lot of hilly terrain, it is difficult to install the fence due to the hilly terrain, and labor costs increase, so the cost of installing the poles accounts for 70% of the fence installation cost. This will increase the fence installation cost. As described above, the installation cost of the posts is a major constraint when installing electric wire fences in forest areas or forests.

In other words, fences can be installed relatively easily on flat land and require no labor costs, but if a fence is installed in a wooded area with many undulating slopes or within a forest, more materials will be required. , construction is difficult and labor costs increase. Another reason for the cost increase when installing fences in forest areas and forests is low land productivity. Flat meadows have high grazing capacity, so a relatively small area is sufficient for enclosing animals, but woodlots and forests require a larger area to achieve the same grazing capacity, so it is difficult to enclose them. The total length of the fence will also be longer. In this way, woodland grazing and forest grazing have been avoided until now because woodlands and forests require longer fences and are more costly than flatlands.

On the other hand, in order to reduce the cost of installing fences in forest areas or forests, it has been conventional practice to replace the posts with trees found in forest areas or forests, thereby significantly reducing the cost of fence facilities. Ta. For example, Patent Document 1 discloses an electric fence device using a tree, in which a wire overhead wire insulator (described as a support in Patent Document 1) is attached to the trunk of the tree with a nail member and a wire is stretched thereon.

Patent No. 6265610

However, in Patent Document 1, when attaching the wire support to the trunk of a tree, the support is fixed by nailing it to the trunk with a nail member, so there was a problem that the tree was damaged by the nail member. Also, unlike metal supports, some trees are not perpendicular to the ground, and the diameter of the trees that grow where the support is installed is not constant, so there are many trees to which the support can be attached. The problem is that it is limited. Furthermore, if the tree has a hump, the surface of the tree is uneven, and if there is a branch, it cannot be attached, so there is a problem that there are restrictions on where the support can be attached to the tree.

On the other hand, if there is an insulator for wire overhead lines that does not damage trees and has fewer restrictions on where it can be attached to trees, it would be possible to replace the supports with trees found in forest areas or forests. can lower the cost of wire fence installation. Furthermore, if the cost of installing fences in forest areas and forests decreases, the number of fences installed in forest areas and forests will increase, and animals will be able to perform heavy labor such as undergrowth management that is currently done by humans.

The present invention enables fences to be installed in forest areas or forests, especially when installing electric wire fences, without damaging trees, with fewer restrictions on where to attach the wires to the trees, and even more easily. An object of the present invention is to provide an insulator for a wire overhead line, which is possible and can reduce the installation cost of a wire fence by replacing the support with a tree located in a woodland or a forest.

According to one form, there is provided an insulator for a wire overhead line, which includes a housing having a wire holding structure on the front side and a support mounting structure on the back side, the holding structure being a wire insulator in which the wire is placed. The passageway is raised perpendicularly to the bottom surface of the wire insertion passage on both sides of the wire insertion passage, the opposing wall is a curved surface, and the distance between the opposing wall at the midpoint from the left wall and the right wall of the wire insertion passage is The mounting structure includes a detachment prevention mechanism that is provided between the two smallest protrusions and the two protrusions above the wire insertion passage, and prevents the wire placed in the wire insertion passage from coming off the wire insertion passage. A left wall and a right wall formed in the extending direction of the wire, an upper wall and a lower wall parallel to the extending direction of the wire, a recess surrounded by the left wall, the right wall, the upper wall and the lower wall, and an upper wall. and a first curved recess of the same shape provided at the same position on the lower wall, another second curved recess of the same shape provided in the center of the first curved recess, and a second curved recess of the same shape provided on the left wall and the right wall. A wire overhead line insulator is provided that is provided with at least two first attachment holes through which attachments for attaching and fixing the casing to the column are inserted.

According to the disclosed insulator for wire overhead lines, when installing a wire fence in a woodland or forest, when replacing the posts with trees in the woodland or forest, it is easy to install the wire fence without damaging the trees. This has the effect of lowering the installation cost of wire fences.

It shows the structure of the first embodiment of the disclosed wire insulator for overhead lines, in which (a) is a plan view, (b) is a front view, (c) is a left side view, and (d) is (a). FIG. (a) is a perspective view of the overhead line insulator shown in Figure 1 viewed diagonally from above to the right with respect to the wire holding side, and (b) is a perspective view of the overhead line insulator shown in (a) from the side where it is attached to the support. FIG. (a) is a perspective view showing how wires and fixtures are attached to the overhead wire insulator shown in FIG. 2(a), and (b) is a second fixture in the overhead wire insulator shown in FIG. 2(b). It is a perspective view explaining the attachment position. (a) is an explanatory diagram illustrating how to attach the disclosed overhead line insulator to a thick tree using a cable tie; (a) is an explanatory diagram showing a cable tie when the disclosed overhead line insulator is attached to a thin tree. It is an explanatory view explaining the attachment method used. FIG. 2 is a side view of a wire fence installed by attaching the disclosed overhead wire insulator to a tree on a slope. (a) is a perspective view showing the state in which the second attachment auxiliary strings are attached to the through-holes of the overhead line insulator shown in Figure 2(a), and (b) is a perspective view of the overhead line insulator being attached to a tree. FIG. 3 is a perspective view illustrating an example in which the tree is attached and fixed using a second fixture and then fixed to another location on the tree using a second fixture. In one embodiment of the disclosed overhead line insulator, the state of the wire held by the overhead line insulator is shown with illustration of the arm portion omitted, and (a) is a diagram showing the state where the wire is held in a U-shape. , (b) is a diagram showing a state in which the wire is held diagonally, and (c) is a diagram showing a state in which the wire held horizontally is held even if it is shaken in the vertical direction. It shows the structure of a second embodiment of the disclosed wire insulator for overhead lines, in which (a) is a plan view, (b) is a front view, and (c) is a left side view. It shows the structure of the third embodiment of the disclosed wire insulator for overhead lines, and is a perspective view of the overhead line insulator seen from the side where the overhead line insulator is attached to a support.

Hereinafter, embodiments of the present application will be described in detail based on specific examples using the accompanying drawings. In the embodiments described below, common reference numerals are given to the same or similar elements, and the scale of the drawings is changed as appropriate to facilitate understanding.

FIG. 1 shows the structure of a first embodiment of the disclosed insulator 1 for wire fences, particularly for electric wire overhead lines, in which (a) is a plan view, (b) is a front view, and (c) is on the left side. A top view, and (d) is a cross-sectional view taken along the line BB in (a). Further, FIG. 2(a) shows the overhead line insulator 1 shown in FIG. 1 viewed diagonally from above to the right with respect to the wire holding side, and FIG. 2(b) shows the overhead line insulator 1 shown in FIG. FIG. 3 is a perspective view seen from the side where it is attached to a support. Here, the structure of the overhead wire insulator 1 will be explained using FIG. 1 and FIG. 2 together.

The casing 2 of the disclosed overhead line insulator 1 is integrally formed by molding using an insulating resin, and even when used as the overhead line insulator 1 for electric wires, the voltage applied to the wire is This prevents it from flowing to the ground through the support. The housing 2 does not need to be made of resin as long as it is an insulating material; for example, it can be made of porcelain. The housing 2 includes a holding structure 10 for holding the wire on the front side, and a mounting structure 20 for attaching the housing 2 to a support, especially a tree, on the back side. Therefore, first, the front side holding structure 10 will be explained, and then the mounting structure 20 will be explained.

The casing 2 includes a left wall 21L and a right wall 21R that are curved in the direction in which the wire held by the overhead wire insulator 1 extends, and an upper wall 22U and a lower wall 22B that are parallel to the direction in which the wire extends. There is. Note that the left wall 21L, the right wall 21R, and the upper wall 22U and lower wall 22B are names for convenience of explanation, and it does not matter which wall is the upper wall or the left wall among the upper, lower, left, and right walls. good. This is because the disclosed casing 2 has the same shape even if it is turned upside down. Therefore, the disclosed casing 2 can be similarly attached to a support regardless of whether the upper wall 22U or the lower wall 22B is on the upper side.

The surface of the casing 2 between the left wall 21L and the right wall 21R is a smooth curved surface, and a wire insertion path 11, which is a space curved in an upwardly protruding direction, and a wire insertion path 11 are formed on this surface. There are protuberances 13 that protrude perpendicularly from the surface of the casing 2 on both sides. An opposing wall 13W of the raised portion 13 that sandwiches the wire insertion path 11 has a curved surface. The distance between the opposing walls 13W is shortest at the midpoint of the wire insertion path 11 from the left and right sides. The opposing wall 13W can have a parabolic curved surface when viewed from above, and in this case, the position of the midpoint from the left and right sides of the wire insertion path 11 becomes the inflection point of the parabola.

Further, on the upper surface of the raised portions 13 on both sides of the wire insertion path 11, a wire 3 removal prevention mechanism 12 is provided to prevent the wire 3 placed in the wire insertion path 11 from coming off from the wire insertion path 11. ing. In this embodiment, the detachment prevention mechanism 12 is provided with two curved arms 12A, first and second curved arms 12A extending from the upper surface of the raised portion 13 so as to straddle the wire insertion path 11, respectively. and the second two arms 12A, it is not necessary to distinguish which one is the first arm or the second arm 12A). The two arms 12A are parallel, and a gap S larger than the diameter of the wire is provided between the two arms 12A. The tips of the two arms 12A reach the upper surface of the raised portion 13 on the opposite side, but there is a gap larger than the diameter of the wire between the tips of the two arms 12A and the upper surface of the raised portion 13. M (see FIGS. 1(b) and 1(c)) is provided.

Furthermore, circumferential grooves 16 parallel to the extending direction of the wire are formed on the upper surfaces of the raised portions 13 on both sides of the bases of the two arms 12A. A through hole 15 is formed which communicates the circumferential groove 16 flush with each other and penetrates through the bases of the two arms 12A. Of the circumferential grooves 16 provided on both sides of the bases of the two arms 12A, the end of the raised portion 13 closer to the opposing wall 13W reaches the opposing wall 13W and cuts out the opposing wall 13W. However, the end of the raised portion 13 that is far from the opposing wall 13W does not reach the opposing wall 13W and ends in a spherical surface. The through hole 15 and the circumferential groove 16 are for attaching a second fixture, which will be described later, to the overhead wire insulator 1.

As shown in FIGS. 1(b) and 1(d), the left wall 21L and the right wall 21R are provided with first mounting holes for inserting cable ties, which are mounting tools for mounting the overhead line insulator 1 to the pillars. 14A (in this embodiment, three each on the left wall 21L and the right wall 21R) are provided. A cover 17 is provided above the first attachment hole 14A to prevent the wire passing through the wire insertion path 11 from coming into contact with the binding band inserted into the first attachment hole 14A.

Next, the mounting structure 20 on the back side of the casing 2 for mounting the overhead line insulator 1 to the support will be described. As shown in FIG. 2(b), the mounting structure 20 includes a left wall 21L and a right wall 21R formed in the direction in which the wire extends, and an upper wall 22U and a lower wall 22B parallel to the direction in which the wire extends. be. A recess 23 is formed in a portion surrounded by the left wall 21L, the right wall 21R, the upper wall 22U, and the lower wall 22B. In this embodiment, the inside of the recess 23 is partitioned into a plurality of sections 24 by a plurality of partition walls 25 (four partition walls in this embodiment) parallel to the upper wall 22U and the lower wall 22B .

The purpose of partitioning the inside of the recess 23 into a plurality of sections 24 is to reinforce the casing 2 and to contact the tree at multiple points when the casing 2 contacts the tree, so that when the overhead wire insulator 1 is attached to the tree, This is to prevent the overhead line insulator 1 from damaging trees. If reinforcement of the casing 2 is not required, the partition wall 25 may not be provided. Furthermore, if the concave portion 23 on the back surface of the casing 2 is divided into a plurality of sections 24 by a partition wall 25, the irregularities of the tree trunk will enter the plurality of sections 24, and if a large force is applied to the casing 2, the casing will be damaged. The risk of the body 2 slipping can be reduced.

The upper wall 22U, the lower wall 22B, and the plurality of partition walls 25 are formed between the left wall 21L and the right wall 21R when viewed from a direction perpendicular to the direction in which the wires are stretched. A first curved concave portion 26 having the same shape and concave on the front side is provided at the same position. Furthermore, a second curved recess 27 having the same shape and recessed toward the front side of the housing 2 is provided at the same position in the center of the first curved recess 26 .

Furthermore, a cavity 18 as shown in FIG. 2(b) is formed on the back side of the raised portion 13 shown in FIG. 2(a). The hollow portion 18 has ribs 19 for reinforcing the raised portion 13. First contact portions 26T are provided at both ends of the first curved recesses 26 formed in the upper wall 22U, the lower wall 22B, and the plurality of partition walls 25, which contact the tree when the diameter of the tree is equal to or greater than a predetermined value. There is. A second contact portion 27T that contacts the tree when the diameter of the tree is less than a predetermined value is provided at both ends of the second curved recess 27 formed in the upper wall 22U, the lower wall 22B, and the plurality of partition walls 25. It is being The first contact portion 26T and the second contact portion 27T have curved surfaces.

In addition, among the four partition walls 25 provided in the recess 23 , between the adjacent outer partition wall 25 and inner partition wall 25 , a front side of the casing 2 is provided on both sides of the first curved recess 26 . A reinforcing wall 28 is provided facing toward. The reinforcing wall 28 is provided with second mounting holes 14B for inserting mounting tools to be described later .

Here, the arrangement of the wire 3 to the overhead wire insulator 1 having the above structure and the attachment of the fixture 6 and the second fixture 9 to the overhead wire insulator 1 will be described using FIG. 3. First, FIG. 3(a) shows how the wire 3 and the fixture 6 are attached to the overhead wire insulator 1 shown in FIG. 2(a). A binding band 6 (hereinafter, the binding band will also be given the same reference numeral 6 as the fitting 6) can be used as the fitting 6. Further, the diameter of the wire 3 is smaller than the distance between the gap S and the gap M.

When the wire 3 is held in the wire insertion path 11, the wire 3 is bent to form a folded part 3T on both sides, and the part between the two folded parts 3T is inserted into the gap S, and the folded part 3T is The wire 3 is moved to the wire insertion path 11 side while passing the tips of the two arms 12A. When the portion of the wire 3 between the two folded portions 3T passes through the gap S and the two folded portions 3T pass the ends of the arms 12A, the wire 3 is pulled in the direction shown by the outline arrow. Then, the two folded portions 3T of the wire 3 pass through the gap M between the tip of the arm 12A and the raised portion 13, and the wire 3 is inserted into the wire insertion path 11 and held.

On the other hand, two cable ties 6 are used, and in the case of a tree with a thick trunk, the two cable ties 6 are attached to the first attachment hole 14A on the inside of the cover 17 provided on the left wall 21L and the right wall 21R. It is attached to the overhead line insulator 1 by inserting it from one side, passing through the inside of the overhead line insulator 1, and pulling it out from the first mounting hole 14A located at the opposite position. In addition, in the case of a tree with a thin trunk, as shown in FIG. 14B, and then the other second attachment hole 14B on the opposite side is inserted to attach it to the overhead wire insulator 1. Note that the two binding bands 6 are inserted between the two first attachment holes 14A or between the two second attachment holes 14B before the overhead wire insulator 1 is attached to the tree. At this time, in order to prevent the two cable ties 6 from falling off from the overhead line insulator 1 before the overhead line insulator 1 is attached to the tree, some kind of structure for preventing the cable ties 6 from falling off may be adopted for the overhead line insulator 1. , its structure, and the working process at the time of installation are not the gist of the present invention, so further explanation will be omitted.

Here, a typical method for fixing the overhead wire insulator 1 to a support (tree trunk 4) will be described with reference to FIG. FIG. 4(a) explains how the overhead wire insulator 1 is attached to a thick support 4, here a thick tree trunk 4 growing in a forest, and shows a cross section of the trunk 4 viewed from above. There is. When fixing the overhead line insulator 1 to the thick trunk 4, insert the cable ties 6 into the first mounting holes 14A in the left wall 21L and right wall 21R of the overhead line insulator 1, and attach both ends of the cable ties 6 to the trunk 4. Fasten with buckle 6B on the back side. The buckle 6B is one means for fixing both ends of the binding band 6 on the back side of the trunk 4, and the method of fixing the binding band 6 is not particularly limited.

In this way, when attaching the overhead wire insulator 1 to a tree with a thick trunk 4, even if there are irregularities on the surface of the trunk 4, the irregularities will be caused by the concave portion 23, the upper wall 22U, and the plurality of partition walls 25 and the lower wall 22B (not shown). It can be inserted into the first curved recess 26 provided. In this state, if the first contact parts 26T at both ends of the first curved recess 26 are brought into contact with the surface of the trunk 4, the recesses 23 and the first curved recess 26 will accept the unevenness on the surface of the trunk 4. This makes it possible to attach the overhead line insulator 1 to the thick trunk 4. Further, the wire 3 held in the wire insertion path 11 does not come off from the overhead wire insulator 1 due to two arms 12A provided on the overhead wire insulator 1 and covering the upper part of the wire insertion path 11 from both sides.

FIG. 4(b) illustrates the state in which the overhead line insulator 1 is attached to a thin support 4, in this case a thin tree trunk 4 growing in a forest, and shows a cross section of the trunk 4 seen from above. There is. When fixing the overhead line insulator 1 to the thin trunk 4, insert the cable tie 6 into the second attachment hole 14B (see FIG. 3(b)) in the bulkhead 25 of the overhead line insulator 1, and secure both ends of the cable tie 6. It is fixed on the back side of the trunk 4 with hook-and-loop fasteners 6F provided at both ends of the binding band 6. The hook-and-loop fastener 6F is also one means for fixing both ends of the binding band 6 to the back side of the trunk 4.

In this way, when attaching the overhead line insulator 1 to the trunk 4 of a thin tree, even if there are irregularities on the surface of the trunk 4, the irregularities will be caused by the concave portion 23, the upper wall 22U, the plurality of partition walls 25 (not shown), and the lower wall 22B. It can be inserted into the second curved recess 27 provided. In this state, if the second abutting parts 27T at both ends of the second curved recess 27 are brought into contact with the surface of the trunk 4, the mounting structure 20 is created in which the irregularities on the surface of the trunk 4 are on the back surface of the casing 2. It is possible to attach the overhead line insulator 1 to the thin trunk 4 by being accepted by the main body. Furthermore, if the cable tie 6 is used as the attachment 6, even if the irregularities on the surface of the trunk 4 enter the recess 23 or the second curved recess 27 of the overhead wire insulator 1, the cable tie 6 can be attached to the trunk within the overhead wire insulator 1. can be deformed along the surface.

The wire insulator 1 having the above-described structure can be easily attached to the trunk 4 of a tree 7 growing on a slope 8 using a fitting (a binding band), as shown in FIG. Therefore, the wire 3 can be easily held on the trunk 4 of the tree 7 growing on the slope 8, so that the electric wire fence 5 in which the wire 3 is connected to a high voltage source can be easily installed on the slope 8.

On the other hand, when attaching the overhead line insulator 1 to a tree growing in a forest, the trunk to which the overhead line insulator 1 is attached may not be vertical, and in such a case, the overhead line insulator 1 may come off the trunk and fall. Furthermore, depending on the type of tree, the attachment surface of the trunk wire insulator 1 may be smooth and the wire insulator 1 may easily slip and come off. In such a case, in the disclosed overhead line insulator 1, in addition to the attachment 6 shown in FIG. Can be strengthened. This will be explained using FIG. 6.

FIG. 6(a) shows a second fitting installed along the circumferential groove 16 in the through holes 15 provided at the bases of the two arms 12A of the overhead line insulator 1 shown in FIG. 2(a). 9 (hereinafter, the attachment auxiliary cord will also be given the same reference numeral 9 as the second fixture 9), which is attached and fixed. In this embodiment, the end of the attachment auxiliary string 9 is inserted into the through hole 15 and then fixed to the overhead line insulator 1 by "closing". The fixing method after the attachment auxiliary string 9 is inserted through the through hole 15 at the end thereof is not limited to the "lid knot", and may be fixed by any arbitrary knotting method. Since the other end of the attachment auxiliary string 9 is free, it can be fixed to another location on the tree or a location other than the tree.

FIG. 6(b) shows a different position in which the casing 2 is fixed using the attachment auxiliary string 9 after the overhead line insulator 1 is attached and fixed to the trunk 4 or thick branch 4B of the tree 7 using the attachment 6. An example in which it is fixed at a different location on the trunk 4 or branch 4B will be explained. The trunk 4 of the tree 7 on the front side has an overhead line insulator 1 attached to the vertical part with a cable tie 6, and the tree 7 on the back side has an overhead line insulator 1 attached to a thick diagonal branch 4B with a cable tie 6. It is attached with. The two attachment auxiliary strings 9 have one end fixed to the overhead line insulator 1, and the other end is fixed by being wrapped around the trunk 4 or branch 4B of the tree 7 above and below the overhead line insulator 1. There is. In this way, by fixing the overhead line insulator 1 to the trunk 4 or branch 4B of the tree 7 using both the binding band 6 and the attachment auxiliary string 9, the possibility that the overhead line insulator 1 will come off the trunk 4 or branch 4B is reduced.

Here, the shape of the raised portion 13 provided on the front side of the overhead wire insulator 1 and the effect of this shape will be explained using FIG. 7. Note that, in order to clearly show the shape of the raised portion 13, FIG. 7 is a plan view in which the tip of the arm 12A is omitted. Opposing walls 13W of the raised portions 13 that protrude perpendicularly from the bottom surface of the wire insertion path 11 on both sides of the wire insertion path 11 are curved surfaces that are folded back at the portions that contact the midpoints of the wire insertion path 11 from the left and right sides. This curved surface can be a parabolic curved surface when viewed from above, and in this case, the folded portion becomes the inflection point of the parabola.

Therefore, the wire 3 arranged in the wire insertion passage 11 can be arranged in the wire insertion passage 11 at various angles with respect to the curved surface of the opposing wall 13W. This is because the trunks of trees to which the overhead line insulators 1 are attached do not necessarily stand up vertically, but instead face various directions, and in some cases, the overhead line insulators 1 are attached to tree branches. This is because there are cases where it is better to Further, the disclosed overhead line insulator 1 can be attached to tree trunks and branches of various shapes, and can also be attached to supports other than trees.

FIG. 7(a) shows a state in which the wire 3 is held in a U-shape in the wire insertion passage 11 of the overhead wire insulator 1, and the wire 3 is in contact with a bent part of the curved surface of one opposing wall 13W. ing. FIG. 7(b) shows a state in which the wire 3 is held obliquely in the wire insertion passage 11 of the overhead wire insulator 1, and the wire 3 is in contact with both the curved surfaces of the upper and lower facing walls 13W. . Furthermore, FIG. 7(c) shows a state in which the wire 3 is swayed in the vertical direction when it is held horizontally in the wire insertion passage 11 of the overhead line insulator 1 without contacting the opposing wall 13W. This shows that.

In a wire fence, the wire 3 may be shaken up and down due to the impact when an animal gets caught on the wire 3. On the other hand, the wire insertion passage 11 of the disclosed overhead wire insulator 1 widens toward the end on both sides of the bent portion of the curved surface of the opposing wall 13W. Therefore, even if the wire 3 is shaken in the vertical direction due to the impact of an animal caught on the wire 3, the wire 3 moves inside the wire insertion path 11, and the wire 3 that is applied to the overhead line insulator 1 is removed. Stress can be reduced and the overhead wire insulator 1 can be made difficult to come off from the tree.

FIG. 8 shows the structure of a second embodiment of the disclosed insulator 1 for wire fences, particularly for electric wire overhead lines, in which (a) is a plan view, (b) is a front view, and (c) is on the left side. It is a front view. This embodiment is the same as the first embodiment in that the casing 2 of the overhead line insulator 1 is integrally formed by molding using an insulating resin. The second embodiment differs from the first embodiment only in the structure of the wire 3 detachment prevention mechanism 12. Therefore, the parts other than the detachment prevention mechanism 12 are given the same reference numerals as in the first embodiment, and the explanation thereof will be omitted.

In the first embodiment, two curved arms 12A, a first and a second curved arm, are provided extending from the upper surface of the raised portion 13 so as to straddle the wire insertion path 11, respectively. In the second embodiment, instead of the two arms 12A, two bolt mounting walls 12W are provided facing each other on the opposing wall 13W side of the raised portion 13. The surfaces of the two bolt mounting walls 12W on the opposing wall 13W side are curved in the same way as the opposing wall 13W, and the opposite side of this curved surface is a plane parallel to the wire insertion path 11.

Each of the two bolt mounting walls 12W is provided with a bolt insertion hole at an opposing position, and the bolt 12B is inserted into the bolt insertion hole and fixed with a nut 12N. The bolt 12B is a half-threaded bolt, and a thread groove is provided only at the tip of the bolt 12B. In the second embodiment, when placing the wire 3 in the wire insertion passage 11, first remove the nut 12N from the bolt 12B, pull out the bolt 12B from the bolt mounting wall 12W, place the wire 3 in the wire insertion passage 11, and then The bolt 12B may be passed through the bolt insertion hole and fixed with a nut 12N.

Further, in the first embodiment, the through holes 15 that communicate the circumferential grooves 16 on both sides were provided at the bases of the two arms 12A. On the other hand, in the second embodiment, since the two arms 12A are not provided, an arch-shaped hook portion 12C is provided above the circumferential groove 16 on the upper surface of the raised portion 13. Therefore, by using this hook portion 12C, the second fixture can be attached as in the first embodiment.

FIG. 9 shows the structure of a third embodiment of the disclosed wire insulator for overhead wires, and is a perspective view of the overhead wire insulator 1 seen from the side where it is attached to a support. The third embodiment differs from the first embodiment only in the mounting structure 20. Therefore, the parts other than the mounting structure 20 are given the same reference numerals as in the first embodiment, and the explanation thereof will be omitted.

In the first embodiment, the recess 23 surrounded by the left wall 21L, the right wall 21R, the upper wall 22U, and the lower wall 22B has four partition walls 25 parallel to the upper wall 22U and the lower wall 22B. It was divided into 5 sections, 24. On the other hand, in the third embodiment, the partition wall 25 parallel to the left wall 21L and right wall 21R is not provided inside the recess 23, and two reinforcing walls 28A parallel to the left wall 21L and right wall 21R are provided. It is provided at the first contact portion 26T of the first curved recess 26. Moreover, three first mounting holes 14A for inserting the mounting tools 6 are provided in each of the two reinforcing walls 28A. In the third embodiment, the second mounting hole 14B is not provided.

The mounting structure 20 of the third embodiment is simple, and the overhead line insulator 1 can be manufactured at low cost, and even with this structure, when the casing 2 comes into contact with a tree, it can be brought into contact with the tree at multiple points. Therefore, when the overhead line insulator 1 is attached to a tree, the overhead line insulator 1 can be prevented from damaging the tree.

1 Insulator for overhead wires 2 Housing 3 Wire 4 Support (tree trunk)
5 Wire fence 6 Attachment (tie tie)
7 Tree 9 Second mounting tool (mounting auxiliary string)
10 Holding structure 11 Wire insertion path 12 Disengagement prevention mechanism 12A Arm 12W Bolt mounting wall 13 Protrusion 13W Opposing wall 14A First mounting hole 14B Second mounting hole 15 Through hole 16 Circumferential groove 20 Mounting structure 21L Left wall 21R Right wall 22B Lower wall 22U Upper wall 23 Recessed part 24 Division 25 Partition 26 First curved recess 26T First contact part 27 Second curved recess 27T Second contact part 28, 28A Reinforcement wall S, M Gap

Claims (8)

An insulator for wire overhead lines, comprising a casing having a wire holding structure on the front side and a support mounting structure on the back side,
The mounting structure includes a left wall and a right wall formed in the extending direction of the wire, an upper wall and a lower wall parallel to the extending direction of the wire, the left wall and the right wall, and the upper wall and the lower wall. The upper wall and the lower wall include a first curved recess of the same shape provided at the same position, and a second curved part of the same shape provided in the center of the first curved recess. a recess, at least two first mounting holes provided at opposing positions of the left wall and the right wall, through which mounting tools for mounting and fixing the casing to the pillar are inserted;
The holding structure includes a wire insertion path in which the wire is disposed, and opposing walls that are raised perpendicularly to the bottom surface of the wire insertion path on both sides of the wire insertion path, and that are curved. two protuberances having the smallest distance between the opposing walls at an intermediate point from the left wall and the right wall of the wire insertion passage; and above the wire insertion passage and between the two protuberances, the wire comprising a detachment prevention mechanism that prevents the wire placed in the wire insertion path from coming off from the wire insertion path;
An insulator for a wire overhead line that can hold the wire in the wire insertion path in a U-shape or in an oblique direction due to the curved surfaces of the two raised portions. The detachment prevention mechanism includes a first arm that extends from the upper surface of one of the raised portions, straddles the wire insertion path, and has a tip reaching above the upper surface of the other raised portion, and The first arm extends from the upper surface, straddles the wire insertion path with a gap larger than the diameter of the wire, and has a distal end reaching above the upper surface of the one protuberance. The wire overhead line insulator according to claim 1, further comprising a parallel second arm. 3. The insulator for a wire overhead line according to claim 2, wherein the curved surface of the opposing wall has a parabolic shape when viewed from above, and the intermediate point is an inflection point of the parabola. 4. The wire insulator for an overhead line according to claim 2, wherein a gap larger than the diameter of the wire is provided between the tips of the first and second arms and the upper surface of the raised part. A circumferential groove in which the raised portion is depressed is formed on both sides of the base of the first and second arms,
A through hole is formed in the bases of the first and second arms to communicate with the circumferential grooves on both sides in a flush manner, and to penetrate through the bases of the first and second arms;
The insulator for a wire overhead line according to any one of claims 2 to 4, wherein a second fixture for fixing the housing at a position different from a position where the housing is fixed by the fixture is inserted through the through hole. . The mounting structure further includes:
a plurality of partition walls provided in the recess parallel to the upper wall and the lower wall and partitioning the inside of the recess into a plurality of sections;
The insulator for a wire overhead line according to any one of claims 1 to 5, further comprising at least two second mounting holes provided in a reinforcing wall between adjacent partition walls and through which the fittings are inserted. A first contact portion is provided at both ends of the first curved recess, and the first contact portion contacts the support when the diameter of the support is equal to or larger than a predetermined value;
7. The insulator for a wire overhead line according to claim 6, wherein second abutting portions are provided at both ends of the second curved recess, the second abutting portions coming into contact with the support when the diameter of the support is less than a predetermined value. Any one of claims 1 to 7, wherein a cover is provided on the wire insertion path side of the first mounting hole to prevent contact between the wire inserted into the first mounting hole and the fitting. An insulator for wire overhead lines according to item 1.

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