JP4114973B2 - Wire cover - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to an electric wire cover, and more particularly, to an electric wire cover attached to the overhead distribution line in order to prevent a short circuit or a ground fault that occurs when an article or a human body having a different potential contacts the overhead distribution line. .
[0002]
[Prior art]
Overhead distribution lines (hereinafter simply referred to as “wires”) placed near the site for hotline construction and construction work, and wires that may come into contact with nearby buildings due to wind, etc. In order to prevent short-circuits and ground faults caused by contact of different articles and human bodies, electric wire covers having electrical insulation are attached.
[0003]
  Figure6These are sectional drawings which show the state by which the electric wire cover 1 which is a typical prior art was mounted | worn with the electric wire 2. FIG. The electric wire cover 1 has a substantially cylindrical shape and has a cover body 3 that is divided in one circumferential direction, and a radial direction of the cover body 3 that is connected to the vicinity of both circumferential ends 4a and 4b of the cover body 3. Each leg portion 5a, 5b extends in a straight line outward. The electric wire cover 1 is realized by a synthetic resin having electrical insulation.
[0004]
Both ends 4a and 4b in the circumferential direction of the cover body 3 are arranged so as to overlap each other in the radial direction of the cover body 3 in a natural state where no external force acts. Among these, the base end portion 6a of one leg portion 5a is connected to the circumferential one end portion 4a arranged outside, and the other leg portion 5b is connected to the vicinity of the other end portion 4b in the circumferential direction. The leg portions 5a and 5b are arranged adjacent to each other in the circumferential direction of the phase cover body 3 in the natural state.
[0005]
When the electric wire cover 1 is attached to the electric wire 2, for example, fingers are inserted between the tip portions 7a and 7b of the leg portions 5a and 5b, and the leg portions 5a and 5b are covered together with the circumferential end portions 4a and 4b. In a state where they are displaced in directions away from each other against the elastic recovery force of the main body 3, the electric wire 2 is guided from the tip portions 7a, 7b side, and between the leg portions 5a, 5b and the circumferential end portions 4a, 4b is passed and accommodated in the internal space of the cover main body 3.
[0006]
Thus, as the electric wire cover 1 attached to the electric wire 2, the voltage applied to the electric wire 2, that is, the one having a withstand voltage performance larger than the working voltage is selected. More specifically, the electric wire cover 1 has a creeping distance (L1 + L2) that is the sum of the length L1 along the circumferential direction of the other circumferential end 4b of the cover body 3 and the length L2 of the legs 5a and 5b. Is selected to have a leg portion 5a, 5b having an appropriate length L2 so that it is equal to a predetermined distance necessary for preventing creeping discharge or larger than the predetermined distance.
[0007]
[Problems to be solved by the invention]
In the above-described conventional technique, the electric wire cover 1 having the long legs 5a and 5b may be selected for the electric wire 2 having a large operating voltage. However, if the leg portions 5a and 5b are long, the influence of the wind becomes large and the electric wire 2 is likely to vibrate. As a result, for example, the joint portion of the electric wire 2 with the retention insulator may break due to metal fatigue. Therefore, it is not preferable to use the wire cover 1 having the long legs 5a and 5b.
[0008]
An object of the present invention is to provide an electric wire cover in which withstand voltage performance is improved without lengthening a leg portion.
[0009]
[Means for Solving the Problems]
  The present invention according to claim 1 is made of an electrically insulating material,Almost cylindricalA hollow cover body divided in the circumferential direction;
  Two legs made of an electrically insulating material and extending in the radial direction of the cover body in the vicinity of both ends in the circumferential direction of the cover body;
  A tangential direction of the cover main body and extending in substantially the same direction as the extending direction of each leg, and a base connected to the base and projecting outward in a direction approaching each other as the distance from the cover main body increases. And a free end formed by bending, andIt is made of an electrically insulating material, has a thickness smaller than the thickness of the cover body and each leg part, and includes at least an auxiliary wall part that covers a part where the cover body and each leg part are connected,
  The auxiliary wall portion has a distal end portion that is farthest from the base portion at the free end portion with respect to each distal end portion that is opposite to the respective base end portions that are continuous with the cover main body at each leg portion. It is divided and provided at intervals in the circumferential direction,
  Each of the leg portions and each auxiliary wall portion has a two-layer structure of a yellow inner layer and a black outer layer.
[0010]
  According to the present invention, the portion where the cover main body and each leg portion are connected,A base portion extending in a direction tangential to the substantially cylindrical cover body and extending in substantially the same direction as the extending direction of each leg, and outward in a direction that is connected to the base portion and approaches each other as the distance from the cover body increases. And a free end formed by bending a convexCovered by auxiliary wall. The inventors of the present invention have tested and confirmed that the withstand voltage performance is improved when a portion where the cover main body and the leg portion are connected is covered with the auxiliary wall portion. It should be noted that a space may be interposed between the cover main body, each leg portion, and the auxiliary wall portion, or a configuration in which an object having electrical insulating properties is packed may be used. In this way, according to the present invention, the withstand voltage performance can be improved without making the legs longer than the above-described conventional wire cover 1.
[0011]
  In addition, since the withstand voltage performance can be improved by providing the auxiliary wall portion, by providing the auxiliary wall portion in the above-described prior art electric wire cover 1, the necessary withstand voltage performance is provided, and the leg portion 5a, It is also possible to shorten 5b. As a result, the vibration of the electric wire due to the wind can be eliminated, and the breakage of the electric wire due to metal fatigue can be eliminated.
  Furthermore, each leg part and each auxiliary wall part have a two-layer structure consisting of a yellow inner layer and a black outer layer, so that the electric wire cover cannot provide sufficient withstand voltage performance from the outside with the electric wire cover attached to the electric wire. It can be easily identified whether or not it is worn to an extent. And since the thickness of each auxiliary wall part is smaller than the thickness of a cover main body and each leg part, an electric wire cover can be reduced in weight and the electric wire cover excellent in withstand voltage performance can be implement | achieved.
  Further, the auxiliary wall portion is configured such that the distal end portion farthest from the base portion at the free end portion is in an auxiliary wall portion with respect to each distal end portion on the opposite side to each base end portion connected to the cover main body at each leg portion. In the work of attaching to the electric wire, the legs are opened in a direction separating from each other against the elastic recovery force of the cover body. When guiding to the above, the leg portions can be easily separated from each other as compared with the configuration in which the auxiliary wall portion is not divided in the circumferential direction. Moreover, in the state which attached the electric wire cover to the electric wire, since the electric wire cover deform | transforms easily according to the slack of an electric wire, the state attached to the electric wire can be maintained reliably.
[0012]
According to a second aspect of the present invention, in the configuration of the first aspect of the present invention, the auxiliary wall portion has a streamline shape that guides wind downstream in the flow direction and reduces air resistance. .
[0013]
According to the invention, the auxiliary wall has a streamlined shape. The streamline is a form in which the air resistance is reduced, and the auxiliary wall portion guides the wind flow on the surface to the downstream side. In other words, the auxiliary wall portion is formed so as to be received from the upstream side to the downstream side without countering the wind flow. Therefore, in the electric wire cover according to the present invention, the streamline-shaped auxiliary wall portion covers a portion where the cover body and each leg portion are bent and connected to each other. Thereby, the breakage of the electric wire can be prevented.
[0014]
According to a third aspect of the present invention, in the configuration of the first or second aspect of the present invention, a space is interposed between the cover body, the vicinity of the tip of each leg portion, and the auxiliary wall portion.
[0015]
According to the present invention, the auxiliary wall portion extends from the cover main body to the vicinity of the distal end portion of each leg portion, whereby a space is interposed between the auxiliary wall portion, the cover main body, and each leg portion. Thereby, the withstand voltage performance of the electric wire cover can be improved without lengthening the legs. Further, by forming the auxiliary wall portion in the streamline shape, the portion where the leg portion is exposed to the outside is reduced as much as possible, and thereby the electric wire breakage due to wind can be eliminated.
[0020]
  Claim4The present invention as described in claims 1 to3In the configuration of the invention according to any one of the above, the auxiliary wall portion is a cover book from the outside.To the bodyIt is detachably mounted.
[0021]
  According to the present invention, the auxiliary wall is a cover book.To the bodyConfigured to be wearable. Therefore, by attaching the auxiliary wall part to the electric wire cover having the structure of only the cover main body and the leg as in the prior art, the withstand voltage performance is improved and the breakage of the electric wire to which the electric wire cover is attached is prevented. Can do.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view showing an electric wire cover 11 according to an embodiment of the present invention. The electric wire cover 11 is connected to a cover body 12 that is substantially cylindrical and is divided in the circumferential direction, and both ends 13 and 14 in the circumferential direction of the cover body 12, and the leg portions 15 that extend outward in the radial direction of the cover body 12. 16 and auxiliary wall portions 17 and 18 that cover portions where the cover body 12 and the leg portions 15 and 16 are connected. The cover body 12, the leg portions 15 and 16, and the auxiliary wall portions 17 and 18 are integrally formed of a synthetic resin having electrical insulation properties such as polyethylene. The electric wire cover 11 is used to prevent a short-circuit accident that occurs when a metal article contacts the electric wire.
[0023]
In the natural state where no external force is applied, the cover body 12 is arranged such that the circumferential ends 13 and 14 are stacked in the radial direction of the cover body 12 in the longitudinal direction (direction perpendicular to the paper surface in FIG. 1). The One leg portion 15 is continuous with the one circumferential end portion 13 disposed on the outer side, and the other leg portion 16 is continued with the other circumferential end portion 14 disposed on the inner side.
[0024]
Insertion guide portions 19 and 20 are respectively formed at the distal end portions of the leg portions 15 and 16 on the side opposite to the base end portion connected to the cover main body 12. The insertion guide portions 19 and 20 expand in a direction away from each other as they move away from the cover body 12. Each insertion guide portion 19, 20 has a guide surface 30 that extends at an angle θ 1, θ 2 with respect to a virtual plane 29 that extends in a direction along the radial direction of the cover body 12. The angles θ1 and θ2 are selected, for example, at 45 degrees. In addition, in the natural state, intermediate portions from the base end portions of the leg portions 15 and 16 to the insertion guide portions 19 and 20 may be elastically brought into contact with each other with a slight gap therebetween. It may be adjacent to.
[0025]
The auxiliary wall portions 17 and 18 include a base portion 21 and a free end portion 22. The base portion 21 extends in the tangential direction of the cover main body 12, and the free end portion 22 is connected to the base portion 21, and is formed to bend outwardly in a direction approaching each other as it is separated from the cover main body 12. The The distal end portion 23 of the free end portion 22 that is farthest from the base portion 21 is divided at the distal end portion 24 of the insertion guide portions 19 and 20 with an interval L3 in the circumferential direction of the auxiliary wall portions 17 and 18. The L3 is selected to be 1 mm, for example. A space 25 is defined by the auxiliary wall portions 17 and 18 formed in this way, the leg portions 15 and 16 and the cover body 12. The thickness t1 and t2 of the cover body 12 and the leg portions 15 and 16 are appropriately selected to have a sufficient withstand voltage performance with respect to the working voltage of the electric wire to be attached, more specifically, a thickness having a sufficient volume insulation resistance Is done. Further, the thickness t3 of each auxiliary wall portion 17, 18 may be selected to be smaller than the thickness t1, t2 of the cover body 12 and the leg portions 15, 16 in order to reduce the weight of the wire cover 11. is there.
[0026]
When the electric wire cover 11 is attached to the electric wire, the leg portions 15 and 16 of the cover main body 12 are connected in a state where the guide surfaces 30 of the insertion guide portions 19 and 20 are in contact with the outer surface of the electric wire. Push in the center in the circumferential direction on the opposite side. Since each guide surface 30 is inclined in directions away from each other at angles θ1 and θ2 with respect to the one virtual plane 29, the respective leg portions 15 and 16 are brought into sliding contact with the outer surface of the electric wire. The cover body 12 can be pushed open in a direction away from each other against the elastic recovery force of the cover body 12. Further, since the auxiliary wall portions 17 and 18 are provided separately from the leg portions 15 and 16 with the interval L3 in the circumferential direction, the auxiliary wall portions 17 and 18 are not divided in the circumferential direction. In comparison, the legs 17 and 18 can be easily separated from each other. Further, the distal end portions 24 of the insertion guide portions 19 and 20 are formed in a rounded shape, so that it is possible to eliminate the problem of damaging the outer surface of the electric wire when pressed against the electric wire.
[0027]
When the electric wire cover 11 is further pushed in with the electric wires interposed between the leg portions 17 and 18 as described above, the electric wires pass between the leg portions 15 and 16, and both end portions 13 in the circumferential direction of the cover body 12. , 14 is led to an internal space 33 defined by the inner surface 32 of the cover body 12. When the electric wire is guided to the internal space 33, the circumferential end portions 13 and 14 and the leg portions 15 and 16 of the cover main body 12 are displaced in directions close to each other by the elastic recovery force of the cover main body 12. As a result, it is possible to eliminate the inconvenience that the electric wire cover 11 falls off the electric wire.
[0028]
Thus, in the state in which the electric wire cover 11 is attached to the electric wire, it is possible to eliminate a problem that an article, a human body, or the like having a different electric potential directly corrodes on the outer surface of the electric wire to cause a short circuit or a ground fault. In the configuration of the embodiment of the present invention, the auxiliary wall portions 17 and 18 are provided and the space 25 is defined, so that the withstand voltage performance of the wire cover 11 is improved as compared with the configuration of the related art described above. Can do. The inventors have covered the surface exposed to the outside of the electric wire cover with an aluminum foil, gradually increased the voltage applied to the electric wire, and measured the voltage at which a short-circuit occurs to measure the voltage at which a short circuit occurs. It has been confirmed that the electric wire cover has a withstand voltage performance of about 1.5 times that of the configuration of the prior art without the auxiliary wall portions 17 and 18. The withstand voltage performance improves as the volume of the space 25 increases. In the embodiment of the present invention, since the auxiliary wall portions 17 and 18 are provided with the base portion 21 extending in substantially the same direction as the extending direction of the leg portions 15 and 16, the space 25 is compared with the configuration in which the base portion 21 is not provided. And can be enlarged.
[0029]
Moreover, in embodiment of this invention, the auxiliary wall parts 17 and 18 are formed so that a wind may be guide | induced to the flow direction downstream. For example, the wind blowing in the direction indicated by the arrow A1 is the wind guided in the direction passing over the wire cover 11 indicated by the arrow A2, and the one side (left side in FIG. 1) indicated by the arrow A3. Along the surface of the auxiliary wall 18, it is divided into a wind guided in a direction passing under the wire cover 11. The wind in the direction of the arrow A2 is guided along the substantially cylindrical upper surface of the cover main body 12 in the direction indicated by the arrow A4. The wind indicated by the arrow A3 passes through the lower part of the wire cover 11 and passes in the direction indicated by the arrow A5. At this time, the wind indicated by the arrow A5 is guided in the same direction in the direction of the arrow A1 by the auxiliary wall 17 on the other side (right side in FIG. 1) so that the negative pressure due to the wake does not increase excessively. Therefore, the air resistance of the electric wire cover 11 can be reduced, thereby eliminating the problem that the electric wire vibrates and breaks.
[0030]
Further, in the state where the electric wire cover 11 is attached to the electric wire, if there is rain, the rain water is guided to the lower part along the outer surfaces of the auxiliary wall portions 17 and 18. Since the distal end portion 23 of the auxiliary wall portions 17 and 18 and the distal end portion 24 of the insertion guide portions 19 and 20 are provided at an interval L3, rainwater is not guided to the insertion guide portions 19 and 20 and is caused by gravity. Fall downward. As a result, rainwater passes between the legs 15 and 16 by the capillary phenomenon from the joint portion 28 and the electric wire is connected between the circumferential end portions 13 and 14 as compared with the configuration in which the interval L3 is not provided. It is possible to eliminate the problem of being guided to the internal space 33 to be accommodated.
[0031]
  The cover body 12, the leg portions 15 and 16, and the auxiliary wall portions 17 and 18 each have a two-layer structure including an inner layer and an outer layer. The inner layer is,yellowColored and outer layerIs blackColored by color. Accordingly, it is possible to easily identify from the outside whether or not the electric wire cover 11 is worn to such an extent that sufficient withstand voltage performance cannot be obtained. Further, the outer surface of the wire cover 11 can be improved in aesthetic appearance, for example, by coloring it in green, and by making the red and white colors alternately, the paraglider pilot or the like can easily identify the wire cover 11. Can do.
[0032]
FIG. 2 is a side view of the electric wire cover 11. Note that FIG. 1 described above is a cross-sectional view as seen from the broken line II. A male end 38 and a female end 39 are provided at both ends of the wire cover 11 in the longitudinal direction. The male end 38 and the female end 39 are formed of a synthetic resin having electrical insulation properties such as polyethylene, and are integrally joined to the wire cover main body 37 by means such as welding. The male end body 38 and the female end body 39 have end body auxiliary wall portions 40 and 41 respectively connected to the auxiliary wall portions 17 and 18. The male end body 38 is configured to be insertable into the inner hole of the female end body 39. The wire cover 11 has a length L4 in the longitudinal direction. The longitudinal length L4 is selected to be 3 m, for example. In order to prevent a short-circuit accident that occurs when a metal article comes into contact with an electric wire, it is necessary to attach the electric wire cover 11 along the longitudinal direction of the electric wire, but the electric wire cover 11 of the present embodiment is By inserting the male end 38 provided at one end of the end into the female end 39 of the adjacent electric wire cover 11, it can be easily connected in the longitudinal direction of the electric wire. Moreover, since the said auxiliary | assistant wall parts 17 and 18 are arrange | positioned so that the said auxiliary | assistant wall parts 17 and 18 may divide | segment into the circumferential direction of the electric wire cover 11 in the electric wire cover 11, more specifically, each front-end | tip part 23 and 24 is each. Are arranged at a distance L3 from each other, so that the wire cover 11 can have the same flexible performance as the above-described prior art wire cover 1, and the wire cover 11 is adapted to the slack of the wire. It is possible to install. As a result, the state in which the electric wire cover 11 is attached to the electric wire can be maintained for a long time.
[0037]
  Figure3These are sectional drawings which show the electric wire cover 48 which is other form of implementation of this invention. Note that the wire cover 48 is similar to the above-described embodiments, and corresponding portions are denoted by the same reference numerals and description thereof is omitted.
[0038]
  A hinge portion 49 is provided at the center in the circumferential direction of the cover body 12 of the wire cover 48. The hinge portion 49 has a thickness t4 larger than the thickness t1 of the cover body 12 and a notch 54, whereby the cover body 12 is configured to be openable and closable in the directions indicated by arrows A6 and A7. . Locking claws 50 and 51 are provided in the vicinity of portions of the leg portions 15 and 16 that are continuous with the cover body 12. These locking claws 50 and 51 are illustrated.3As shown by the solid line, the cover main body 12 can be prevented from being displaced in the directions of arrows A6 and A7.
[0039]
In the electric wire cover 48 configured as described above, the attaching operation to the electric wire can be easily performed as compared with the above-described embodiments. Accordingly, the wire can be easily attached to the electric wire using, for example, an electric wire cover attachment robot. Moreover, the front-end | tip parts 52 and 53 of each leg part 15 and 16 become a structure in which the insertion guide parts 19 and 20 for inserting an electric wire easily are not provided compared with each above-mentioned embodiment. Therefore, in a state where the electric wire cover 49 is attached to the electric wire, it is possible to eliminate the problem that the wind flows into the insertion guide portions 19 and 20 and the negative pressure due to the wake becomes excessive and the electric wire vibrates.
[0040]
  Figure4These are sectional drawings which show the electric wire cover 55 which is other form of implementation of this invention. The electric wire cover 55 is similar to the above-described embodiment, and corresponding portions are denoted by the same reference numerals and description thereof is omitted.
[0041]
  In the electric wire cover 55 of the present embodiment, the legs 56 and 57 form one angle several times at an angle θ4 with respect to the virtual plane 29 along the radial direction of the cover body 12 (see FIG.4Right side) and the other side (figure4The left side is bent. The angle θ4 is selected to be 45 degrees, for example.
[0042]
In the electric wire cover 55 formed by bending the leg portions 56 and 57 as described above, the leg portions such as the electric wire covers 11, 43, 46, and 48 extend in a straight line in the radial direction of the cover body 12. Compared with, a long creepage distance can be secured. That is, the withstand voltage performance can be improved. In other words, the required withstand voltage performance can be provided, and the length L5 of the legs 56 and 57 along the radial direction can be shortened as compared with the above-described embodiments. That is, it is possible to reduce the size of the electric wire cover 55, thereby reducing the influence of the wind, suppressing the vibration of the electric wire, and preventing the electric wire from being broken.
[0053]
  Figure5These are sectional drawings which show the electric wire cover 69 which is other form of implementation of this invention. The electric wire cover 69 of the present embodiment is similar to the electric wire cover 65 described above, and corresponding portions are denoted by the same reference numerals and description thereof is omitted.
[0054]
In the electric wire cover 69, the auxiliary wall portion 70 having a substantially C-shaped cross section perpendicular to the axis is attached to the above-described conventional electric wire cover portion 65a. The auxiliary wall portion 70 is formed in a substantially C shape that is divided in the circumferential direction, and the length between the circumferential end portions 71 and 72 is smaller than the circumferential length of the cover body 12. The auxiliary wall portion 70 is realized by polyethylene, for example, and has flexibility. The auxiliary wall 70 has an internal space that can cover at least the cover body 12 from the outside.
[0055]
When the auxiliary wall portion 70 formed in this way is attached to the conventional electric wire cover portion 65a, the cover body 12 is fitted from the top so as to guide the cover body 12 to the internal space 73 from both circumferential ends 71 and 72. Installing. In the state where the auxiliary wall portion 70 is mounted, the space 74 is interposed between the auxiliary wall portion 70 and the conventional wire cover portion 65a, so that the withstand voltage performance is improved, and the auxiliary wall portion 70 flows the wind. Since it has a streamline shape that leads to the downstream side in the direction and reduces the air resistance, it is possible to suppress the influence of the wind due to the air resistance and prevent the breakage of the electric wire. Further, as compared with the auxiliary wall portions 66 and 67 of the above-described embodiment, means for attaching to the conventional electric wire cover portion 65a such as adhesion can be omitted, so that the auxiliary wall portion 70 can be easily attached. It can be carried out.
[0056]
In the electric wire cover of each embodiment of the present invention described above, a rib that extends in the circumferential direction of each electric wire cover and guides the wind may be provided on the surface of the auxiliary wall portion, or the wind is disturbed. You may provide the dent called dipping provided in the surface. Thus, by providing ribs or dipping for guiding the wind or disturbing the wind flow on the surface of each auxiliary wall portion, the resistance value against the air flow of the wire cover is further reduced, and the wire breaks. It can be eliminated. In each of the above-described embodiments, polyethylene is used, so that flame retardancy can be imparted in addition to electrical insulation, but the configuration of the present invention is not limited to polyethylene, for example, polypropylene. May be.
[0057]
In the configuration of the present invention, since air exists in the space interposed between the cover body 12 and each leg portion and the auxiliary wall portion, the withstand voltage performance is improved, the amount of material used is reduced, and the weight is reduced. In addition, an inexpensive wire cover can be realized. However, in the structure of this invention, it is not limited to air, For example, the structure filled with substances, such as urethane foam which has insulation, may be sufficient. Moreover, although the overhead distribution line was assumed as an object to which the wire cover of the present invention is attached, the present invention is not limited to this, and the present invention is provided near the utility pole, and the edge turning wire connected between the overhead distribution lines is provided. You may apply to the flexible bellows-shaped electric wire cover which covers.
[0058]
【The invention's effect】
  According to the first aspect of the present invention, the portion where the cover main body and each leg portion are connected,A base portion extending in a direction tangential to the substantially cylindrical cover body and extending in substantially the same direction as the extending direction of each leg, and outward in a direction that is connected to the base portion and approaches each other as the distance from the cover body increases. And a free end formed by bending a convexSince it is covered with the auxiliary wall portion, the withstand voltage performance can be improved without lengthening the leg portion as compared with the above-described conventional wire cover 1.
[0059]
  In addition, since the withstand voltage performance can be improved by providing the auxiliary wall portion, by providing the auxiliary wall portion in the above-described prior art electric wire cover 1, the necessary withstand voltage performance is provided, and the leg portion 5a, It is also possible to shorten 5b. As a result, the vibration of the electric wire due to the wind can be eliminated, and the breakage of the electric wire due to metal fatigue can be eliminated.
  In such an electric wire cover, since the leg portion and the auxiliary wall portion have a two-layer structure, it is possible to easily identify from the outside that the withstand voltage performance has deteriorated due to wear. Further, since the auxiliary wall portion has a smaller thickness than the cover main body and the leg portion, it is possible to realize an electric wire cover that is lightweight and has excellent withstand voltage performance.
  The auxiliary wall portion has a distal end portion that is farthest from the base portion at the free end portion, and a peripheral portion of the auxiliary wall portion with respect to each distal end portion that is opposite to each base end portion that is continuous with the cover body at each leg portion. Since it is provided with a gap in the direction, the legs are opened in directions away from each other against the elastic recovery force of the cover body in the work of attaching to the wires, and the wires are guided between the legs. In this case, the leg portions can be easily separated from each other as compared with the configuration in which the auxiliary wall portion is not divided in the circumferential direction. Moreover, in the state which attached the electric wire cover to the electric wire, since the electric wire cover deform | transforms easily according to the slack of an electric wire, the state attached to the electric wire can be maintained reliably.
[0060]
According to the second aspect of the present invention, the auxiliary wall portion is formed so as to be received from the upstream side to the downstream side without opposing the wind flow, and the cover body and each leg portion are bent and connected. Therefore, as compared with the above-described conventional technique, the vibration of the electric wire due to the wind can be eliminated, thereby preventing the electric wire from being broken.
[0061]
According to the third aspect of the present invention, the auxiliary wall portion extends from the cover main body to the vicinity of the tip end portion of each leg portion, whereby a space is interposed between the auxiliary wall portion, the cover main body, and each leg portion. Therefore, the withstand voltage performance of the wire cover can be improved without lengthening the legs. Further, by forming the auxiliary wall portion in the streamline shape, the portion where the leg portion is exposed to the outside is reduced as much as possible, and thereby the electric wire breakage due to wind can be eliminated.
[0064]
  Claim4According to the described invention, the auxiliary wall portion is a cover book.To the bodySince it is constructed so that it can be attached, the voltage resistance performance is improved by attaching the auxiliary wall part to the electric wire cover having only the cover main body and the leg part as in the prior art, and the electric wire on which the electric wire cover is attached. Can be prevented from breaking.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an electric wire cover 11 according to an embodiment of the present invention.
FIG. 2 is a left side view of the wire cover 11. FIG.
FIG. 3 shows the implementation of the present invention.furtherAnother form of wire cover48FIG.
FIG. 4 is an electric wire cover according to still another embodiment of the present invention.55FIG.
FIG. 5 is an electric wire cover according to still another embodiment of the present invention.69FIG.
[Fig. 6]Electric wire cover 1 which is a typical prior artFIG.
[Explanation of symbols]
11, 48,55, 69 Wire cover
12 Cover body
13, 14 Both ends in circumferential direction
15, 16, 56, 57Each leg
17, 18, 70 Auxiliary wall
24 Tip
25,74 spaces

Claims (4)

A hollow cover body made of an electrically insulating material, substantially cylindrical and divided in the circumferential direction;
Two legs made of an electrically insulating material and extending in the radial direction of the cover body in the vicinity of both ends in the circumferential direction of the cover body;
A tangential direction of the cover body and extending in a direction substantially the same as the direction in which each leg extends, and a base that is connected to the base and protrudes outwardly in a direction closer to each other as the distance from the cover body increases. A free end portion formed by bending, and an electrically insulating material, having a thickness smaller than the thickness of the cover main body and each leg, and at least a portion where the cover main body and each leg are continuous. Including an auxiliary wall portion for covering,
The auxiliary wall portion has a distal end portion that is farthest from the base portion at the free end portion with respect to each distal end portion that is opposite to the respective base end portions that are continuous with the cover main body at each leg portion. It is divided and provided at intervals in the circumferential direction,
Each said leg part and each auxiliary wall part consist of 2 layer structure of a yellow inner layer and a black outer layer, The electric wire cover characterized by the above-mentioned.   The electric wire cover according to claim 1, wherein the auxiliary wall portion has a streamline shape that guides wind downstream in the flow direction and reduces air resistance.   The electric wire cover according to claim 1, wherein a space is interposed between the cover main body, the vicinity of the tip of each leg portion, and the auxiliary wall portion. The electric wire cover according to claim 1, wherein the auxiliary wall portion is detachably attached to the cover body from the outside .

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