JP7056913B2 - Wire cover - Google Patents

Description

The present invention relates to an electric wire cover used for the purpose of preventing a short circuit in a portion where a core wire is exposed from a coating or a portion where ends of a pair of electric wires are connected to each other.

In the construction of overhead distribution lines, a method of providing a bypass route around the construction site is widely adopted in order to ensure the safety of workers. Then, after the necessary construction is completed, the portion where the core wire is exposed from the coating of the overhead distribution line will be repaired.

When repairing an exposed core wire portion of an overhead distribution line, a technique has been proposed in which a wire cover made of an insulating resin or the like is placed over the wire in order to prevent a short circuit from the exposed portion (for example). , Patent Document 1). Of course, such an electric wire cover is also used for a portion where the ends of the overhead distribution line are connected to each other.

In addition, since the overhead distribution line is exposed to wind and rain for a long period of time, moisture may condense between the core wire and the insulating coating that covers it, and the moisture may accumulate in the wire cover, causing a short circuit. be. Further, it is conceivable that rainwater directly infiltrates into the electric wire cover and collects in the electric wire cover.

Therefore, in order to drain the water accumulated in the electric wire cover, a technique of providing a drain hole (for example, Patent Document 2) and a technique of providing a concave groove for draining (for example, Patent Document 3) have been proposed. There is. Furthermore, measures are generally taken to prevent rainwater from the outside from entering by wrapping adhesive tape or the like around both ends of the wire cover. A technique for preventing the infiltration of the material has also been proposed (for example, Patent Document 4).

Japanese Patent Application Laid-Open No. 2003-264917 Jitsukaisho 48-113000 Japanese Patent Application Laid-Open No. 57-183211 Japanese Unexamined Patent Publication No. 2011-250599

However, simply providing a "hole" for draining water does not sufficiently drain the water accumulated in the wire cover, and rainwater enters the wire cover through the draining hole. There was also a risk of coming. Further, if it is difficult to infiltrate rainwater or the like from the outside by wrapping an adhesive tape or the like, there is a problem that it is difficult to discharge the water accumulated in the electric wire cover.

The present invention has been made in view of such a problem, and an object thereof is to be able to efficiently discharge the water in the electric wire cover and reduce the risk of rainwater or the like infiltrating into the electric wire cover. The purpose is to provide a cover for electric wires that can be used.

According to one aspect of the invention
A cover for an electric wire having a pair of semi-cylindrical bodies that are combined with each other to form a tubular body that covers the outside of the electric wire.
Drain holes that communicate the inside and outside of the electric wire cover are formed at both ends of the half cylinder.
Inside the drain hole, an inner tapered portion is formed that is inclined from the inside to the outside of the electric wire cover in a direction away from the central axis in the longitudinal direction of the electric wire cover .
Provided is a cover for an electric wire, characterized in that a plurality of the drain holes are provided radially about a central axis in the longitudinal direction of the tubular body .

Preferably, the drain hole has a shape in which the height dimension gradually increases toward the outside.

Preferably, the inner end portion of the drain hole is provided with a flange portion projecting in a direction away from the central axis.

According to the present invention, the water content in the electric wire cover can be efficiently discharged, the risk of rainwater or the like infiltrating into the electric wire cover can be reduced, and the possibility of a short circuit can be further reduced. We were able to provide a cover for you.

It is a perspective view which shows the open state of the electric wire cover 10 to which this invention is applied. It is a front view which shows the inside of the electric wire cover 10 to which this invention was applied in an open state. It is an enlarged front view centering on the electric wire holding part 22 in the half cylinder body 12 to which this invention was applied. For convenience of explanation, some structures are omitted. It is an enlarged rear view centering on the electric wire holding part 22 in the semi-cylindrical body 12, 14 to which this invention was applied. It is an enlarged front view centering on a drain hole 100. It is sectional drawing which shows the drainage hole 100 in the state which the semi-cylindrical bodies 12, 14 to which this invention was applied are closed. It is a figure which shows the electric wire which attaches the electric wire cover 10. It is a figure which shows the state which the electric wire cover 10 was hung on the electric wire. It is a figure which shows the state which the electric wire cover 10 was hung on the electric wire. It is a figure which shows the state which the work of attaching the electric wire cover 10 to an electric wire is completed. It is a figure which shows the state which the electric wire is fitted in the electric wire cover 10.

(Structure of cover 10 for electric wire)
1 and 2 show an electric wire cover 10 according to an embodiment to which the present invention is applied. The electric wire cover 10 includes a pair of semi-cylindrical bodies 12, 14 and hinges 16, and the semi-cylindrical bodies 12, 14 are combined with each other to form a tubular body that covers the outside of the electric wire. Both half cylinders 12 and 14 have edges facing each other connected by a hinge 16 and are integrally formed. Further, both half cylinders 12 and 14 are basically formed line-symmetrically with each other centering on the hinge 16. Therefore, in the following, the configuration of the half-cylinder body 12 will be described in detail, and with respect to the half-cylinder body 14, only the portion different from the half-cylinder body 12 will be described with reference to the description of the half-cylinder body 12.

Throughout the present specification, the energizing member inside the electric wire is referred to as a core wire S, the insulating member covering the outside of the core wire S is referred to as a coating H, and the entire core wire S covered by the coating H is covered. It is called electric wire L or simply electric wire.

The half-cylinder body 12 is roughly an end portion opposite to the main body portion 20, the electric wire holding portions 22 formed at both ends of the main body portion 20, and the end portion of the main body portion 20 on which the hinge 16 is formed. It has an engagement portion 24 provided in the above, and these are integrated to form a half-cylinder body 12. Of course, the main body portion 20, the electric wire holding portion 22, and the like may be formed as separate bodies, and then combined by means such as adhesion to form the half-cylinder body 12. Further, the hinge 16 is not an essential component, and a pair of semi-cylindrical bodies 12 and 14 may be formed as separate bodies, and these may be combined by means such as fitting to form a tubular body.

The main body 20 is a semi-cylindrical member extending in the longitudinal direction. Further, at the inner outer end portion of the main body portion 20, an eaves portion 31 extending in the longitudinal direction and watertightening the internal space in which the electric wires are housed when the two half cylinders 12 and 14 are combined is provided. ..

A pair of electric wire holding portions 32 are formed on the inner surface 30 of the main body portion 20 of the half cylinder body 12. Each electric wire holding portion 32 is arranged at a position separated by an equal distance from the center in the longitudinal direction of the main body portion 20. Further, each of the electric wire holding portions 32 is composed of a pair of holding bodies 34. Further, the pair of holding bodies 34 are formed with arc-shaped notches 35 formed along the outer peripheral surface of the core wire S. Further, the pair of holding bodies 34 are arranged so as to be narrower than the diameter dimension of the core wire S. The mode of the electric wire holding portion 32 is not limited to this, and one electric wire holding portion 32 may be formed by one holding body 34, or a pair of holding bodies 34 may be formed from the diameter dimension of the core wire S. The core wires S may be fitted between the pair of holding bodies 34 by arranging them so as to be slightly separated from each other.

Further, a pair of electric wire holding portions 42 are formed on the inner surface 30 of the main body portion 20 of the half-cylinder body 14. Each electric wire holding portion 42 is arranged at a position corresponding to each electric wire holding portion 32 formed in the half cylinder body 12. That is, as will be described later, when the electric wires are sandwiched by combining the half cylinders 12 and 14, the core wire S can be sandwiched between the arc-shaped notch 35 in the electric wire holding portion 32 and the electric wire holding portion 42. ..

The electric wire holding portions 22 are provided at both ends of the main body portion 20 as described above, and as shown in FIGS. 3 and 4, the electric wire holding portions 22 are located near the center in the longitudinal direction of the electric wire cover 10 following the main body portion 20. It has a semi-cylindrical portion 26 formed, a semi-conical trapezoidal portion 28 formed at a position following the semi-cylindrical portion 26, and an outer covering portion 29 that covers the outside of the semi-cylindrical portion 26. The semi-conical cone 28 has a shape in which the truncated cone is divided in half by the surface including the central axis thereof. That is, the semi-conical trapezoidal portion 28 has an internal shape such that the diameter of the semi-conical trapezoidal portion 28 decreases as the distance from the center in the longitudinal direction of the electric wire cover 10 increases.

The diameter D1 (see FIG. 3) of the tip of the semi-conical trapezoidal portion 28 is formed to be slightly smaller than the diameter of the coated electric wire L to which the electric wire cover 10 is attached. Further, the semi-conical trapezoidal portion 28 is formed with a notch 36 extending in the longitudinal direction, and the semi-conical trapezoidal portion 28 has a plurality of holding pieces 38 partially separated by the notch 36. As a result, even if the diameter of the coated electric wire L to which the electric wire cover 10 is attached is slightly larger than planned, the tip of the holding piece 38 can be expanded accordingly to correspond to the diameter of the coated electric wire L. can.

Further, the inner surface of the semi-cylindrical portion 26 abuts on the outer surface of the coated electric wire L, so that rainwater, insects, dust, etc. enter the electric wire cover 10 from the outside along the surface of the coated electric wire L. A plurality of strip-shaped tongue pieces 40 for preventing rainwater intrusion are provided so as to prevent the above.

The outer covering portion 29 is a portion that covers the outside of the semi-cylindrical portion 26 as described above. The inner surface of the outer covering portion 29 and the outer surface of the semi-cylindrical portion 26 are separated from each other, and the space between them is the drain hole 100.

The structure of the drain hole 100 will be described by detailing the shapes of the semi-cylindrical portion 26 and the outer covering portion 29 in the present embodiment with reference to FIG.

The drain hole 100 refers to a space (indicated by diagonal lines in FIG. 5) between the outer surface of the semi-cylindrical portion 26 and the inner surface of the outer covering portion 29.

The outer surface shape of the semi-cylindrical portion 26 includes a drain hole tapered portion 50 that inclines from the inside to the outside in the longitudinal direction of the electric wire cover 10 toward the central axis C in the longitudinal direction, and the drain hole taper. At the inner end of the electric wire cover 10 in the portion 50, it is defined by a flange portion 52 projecting in a direction away from the central axis C. Further, a step 54 is formed between the drain hole tapered portion 50 and the flange portion 52.

Next, the inner surface shape of the outer covering portion 29 continues from the step portion 61 which continues from the inner surface 30 of the main body portion 20 of the half cylinder body 12 and is substantially perpendicular to the central axis C, and the step portion 61. An inner tapered portion 60 that inclines in a direction away from the central axis C from the inner side to the outer side in the longitudinal direction of the electric wire cover 10, and a horizontal portion substantially parallel to the central axis C that continues from the outer end of the inner tapered portion 60. It is defined in Section 62.

As a result, the drain hole 100 in the present embodiment communicates with the inside and outside of the electric wire cover 10. Further, as described above, inside the drain hole 100, an inner taper is inclined from the inside to the outside of the electric wire cover 10 in a direction away from the central axis C in the longitudinal direction of the electric wire cover 10. The portion 60 is formed.

Further, the drain hole 100 is between a horizontal portion 62 substantially parallel to the central axis C and a drain hole tapered portion 50 inclined in a direction approaching the central axis C from the inside to the outside of the electric wire cover 10. The drainage hole 100 has a shape in which the height dimension HD gradually increases toward the outside of the electric wire cover 10.

Further, since the flange portion 52 projecting in the direction away from the central axis C is provided at the inner end of the electric wire cover 10 in the drain hole tapered portion 50, the outer surface of the semi-cylindrical portion 26 and the outer surface of the semi-cylindrical portion 26 are provided. The distance LD between the outer covering portion 29 and the inner surface is the shortest in the flange portion 52. In addition, since the step 54 is formed between the drain hole tapered portion 50 and the flange portion 52 on the outer surface of the semi-cylindrical portion 26, the outer surface of the semi-cylindrical portion 26 and the outer covering portion 29 The distance LD between the inner surface and the inner surface sharply becomes longer (wider) when moving from the flange portion 52 to the drain hole tapered portion 50.

Further, in the present embodiment, as shown in FIG. 6, eight drain holes 100 as described above are configured radially around the central axis C of the electric wire cover 10 and at substantially even intervals in the circumferential direction. However, the number of drain holes 100 is not limited to this, and may be any number as long as it is two or more.

Returning to FIGS. 1 and 2, the engagement portion 24 includes three sets of engagement tools 70 and one grip portion 74 in the case of the present embodiment.

The engagement tool 70 is for holding the state in which the half cylinders 12 and 14 are combined with each other by bending the electric wire cover 10 with the hinge 16. A male fastener 76 is formed on one half-cylinder body (half-cylinder body 12 in this embodiment), and a female fastener is formed on the other half-cylinder body (half-cylinder body 14 in this embodiment). 78 is formed.

The grip portion 74 is a tongue piece that is projected from the central fastener 70 (male engagement tool 76) in one of the half cylinders 12 and 14 (half cylinder 12 in this embodiment), and is for an electric wire. This is a portion that is gripped by a gripping tool such as a yatco when the cover 10 is attached to an electric wire. The number of grip portions 74 is not limited to the number (one) as in the present embodiment, and may be two or more. Further, the base portion of the grip portion 74 with respect to the half cylinders 12 and 14 is formed thinly, and the grip portion 74 can be twisted from the half cylinders 12 and 14 after the electric wire cover 10 is attached to the electric wire. You may do so.

(Procedure for attaching the electric wire cover 10 according to the embodiment)
The procedure for attaching the above-mentioned electric wire cover 10 to the electric wire will be briefly described. As shown in FIG. 7, the separation distance between the pair of electric wire holding portions 32 in the electric wire cover 10 is slightly larger than the length of the exposed core wire S with respect to the core wire S exposed in the intermediate portion of the covered electric wire L. It is set short. Of course, the wire cover 10 according to this embodiment is used not only for the exposed core wire S but also for the portion where the core wire S at the end of the cut overhead distribution line is connected to each other by a straight sleeve or another method. can do.

Next, the grip portion 74 is gripped with a gripping tool, and the core wire S is applied to the notch 35 in the pair of holding bodies 34 constituting the wire holding portion 32. At this time, the core wire S is located between the pair of electric wire holding portions 32 formed in the main body portion 20, and the covered electric wire L is the electric wire holding portion 22 (or the tip portion of the semi-conical trapezoidal portion 28 in the electric wire holding portion 22). ) Is positioned along the central axis.

After that, as shown in FIG. 8, while holding the grip portion 74 with a gripping tool (not shown) to hold the position of the electric wire cover 10, the other half cylinders 12 and 14 (half cylinders in the present embodiment). Hook-type tools such as a bind hammer are hung on 14) and pulled downward, and the electric wire cover 10 is bent around the hinge 16 to close both half cylinders 12 and 14. As a result, as shown in FIG. 9, the electric wire cover 10 covers the electric wire and is kept substantially closed, and the hinge 16 is vertically upward due to the downward pulling force by the gripping tool (not shown), and the grip portion 74. Can maintain an appropriate position where is almost vertically downward. Even if the gripping tool that grips the grip portion 74 is removed in this state, there is no problem that the electric wire cover 10 falls from the electric wire.

Finally, with the hook type tool hooked, the male engaging tool 76 and the female engaging tool 78 corresponding to each other are engaged with each other by using a gripping tool or the like. Then remove the hook type tool. As a result, as shown in FIG. 10, both half cylinders 12 and 14 are fixed to each other in a state of covering the electric wire, and the attachment of the electric wire cover 10 to the electric wire is completed.

(Characteristics of the electric wire cover 10 according to the embodiment)
(1)
As described above, with reference to FIG. 5, inside the drain hole 100 in the present embodiment, from the inside to the outside of the electric wire cover 10 from the central axis C in the longitudinal direction of the electric wire cover 10. An inner tapered portion 60 that is inclined in the direction of separation is formed. As a result, when the drain hole 100 is vertically below the central axis C, the inner tapered portion 60 has a downward inclination from the inside to the outside of the electric wire cover 10, and the moisture in the electric wire cover 10 descends. The inclination makes it easier to discharge to the outside.

(2)
Further, the drain hole 100 has a shape in which the height dimension HD gradually increases toward the outside of the electric wire cover 10. Moisture that has descended from the inner tapered portion 60 and entered the drain hole 100 receives resistance to suppress outflow to the outside by receiving fluid friction with the outer surface of the semicircular columnar portion 26 and the inner surface of the outer covering portion 29. However, by forming the drain hole 100 so that the height dimension HD gradually increases toward the outside, it is possible to make the resistance less likely to be received and to maintain good water discharge.

(3)
Further, the distance LD between the outer surface of the semi-cylindrical portion 26 and the inner surface of the outer covering portion 29 is the shortest in the flange portion 52, and the outer surface of the semi-cylindrical portion 26 and the inner surface of the outer covering portion 29 are the same. By rapidly increasing (widening) the distance between the flanges 52 when moving from the flange portion 52 to the drainage hole taper portion 50, in combination with the above-mentioned features (1) and (2), the moisture passing through the flange portion 52 causes the distance between the two. It is expected that the moisture in the wire cover 10 will be discharged more efficiently by attracting the moisture inside the flange portion 52 to the outside.

(4)
Further, if the shape of the drain hole 100 in the present embodiment is used, not only the water in the electric wire cover 10 can be efficiently discharged as described above, but also the drain hole 100 is vertically above the central axis C. In this case, it is possible to reduce the possibility that moisture such as rainwater infiltrates into the electric wire cover 10 through the drain hole 100. That is, when the drain hole 100 is vertically above the central axis C, the inner tapered portion 60 protrudes from the inside to the outside of the electric wire cover 10 and has penetrated through the drain hole 100. Moisture hits the inner tapered portion 60. As a result, the inward momentum of the infiltrated water disappears, and the water that has entered the main body 20 falls vertically downward as it is, and responds from another (downwardly inclined) inner taper portion 60 there. It is discharged to the outside through the drain hole 100.

(5)
Further, when the drain hole 100 is vertically above the central axis C, the drain hole tapered portion 50 of the semi-cylindrical portion 26 is inclined downward toward the outside, so that it penetrates through the drain hole 100. The water to be tried must go up the downward slope in the opposite direction, and as a result, it is difficult for the water from the outside to pass through the drain hole 100 and enter the main body portion 20.

(6)
Further, when the drain hole 100 is vertically above the central axis C, the flange portion 52 projecting from the central axis C at the inner end of the electric wire cover 10 in the drain hole tapered portion 50 is ". It comes to play the role of a "weir", and the water that has climbed up the downwardly sloping drain hole tapered portion 50 cannot enter the wire cover 10 unless it gets over this "weir" (= flange portion 52). Can not. The presence of the flange portion 52 makes it more difficult for moisture from the outside to pass through the drain hole 100 and enter the main body portion 20.

(7)
Further, since a plurality of drain holes 100 are configured radially around the central axis C of the electric wire cover 10 at substantially equal intervals in the circumferential direction, the electric wire cover 10 attached to the electric wire covers the electric wire. Even when the wire is undesirably rotated to the center, since one of the drain holes 100 is located vertically below, the water in the wire cover 10 can be discharged. Of course, at that time, as described above, it is difficult for rainwater or the like from the outside to enter through the drain hole 100 located vertically above.

(8)
Further, a pair of electric wire holding portions 32 are formed on the inner surface of the main body portion 20 of the electric wire cover 10 according to the present embodiment. As a result, as shown in FIG. 11, when the wire cover 10 is attached centering on the position where the core wire S is exposed, the pair of holding bodies 34 in the wire holding portion 32 are slightly narrower than the exposed dimension of the core wire S. Since they are arranged apart from each other, even if the electric wire cover 10 tries to move in the longitudinal direction of the electric wire, the covered electric wire L having a diameter larger than that of the core wire S comes into contact with the holding body 34. This makes it possible to prevent the electric wire cover 10 from undesirably moving in the longitudinal direction of the electric wire.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims, not the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

10 ... Electric wire cover, 12 ... Semi-cylindrical body, 14 ... Semi-cylindrical body, 16 ... Hinge 20 ... Main body part, 22 ... Electric wire holding part, 24 ... Engagement part, 26 ... Semi-cylindrical part, 28 ... Semi-conical cone Shape, 29 ... outer cover,
30 ... inner surface, 31 ... eaves, 32 ... wire holding part, 34 ... holding body, 35 ... notch, 36 ... notch, 38 ... holding piece, 40 ... rainwater intrusion prevention tongue piece, 42 ... wire holding part 50 ... (semi-cylindrical portion 50) drain hole tapered portion, 52 ... (semi-cylindrical portion 50) flange portion, 54 ... step,
60 ... Inner tapered portion (of outer covering portion 29), 61 ... Stepped portion, 62 ... Horizontal portion (of outer covering portion 29),
70 ... Mooring tool, 74 ... Grip part, 76 ... Male mooring tool, 78 ... Female mooring tool 100 ... Drain hole L ... Covered wire, S ... Core wire, H ... Covered

Claims (3)

A cover for an electric wire having a pair of semi-cylindrical bodies that are combined with each other to form a tubular body that covers the outside of the electric wire.
Drain holes that communicate the inside and outside of the electric wire cover are formed at both ends of the half cylinder.
Inside the drain hole, an inner tapered portion is formed that is inclined from the inside to the outside of the electric wire cover in a direction away from the central axis in the longitudinal direction of the electric wire cover .
A cover for an electric wire, characterized in that a plurality of drain holes are provided radially around a central axis in the longitudinal direction of the cylindrical body . The electric wire cover according to claim 1, wherein the drain hole has a shape in which the height dimension gradually increases toward the outside. The electric wire cover according to claim 1 or 2, wherein a flange portion is provided at the inner end portion of the drain hole so as to project in a direction away from the central axis.

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