JP6970411B2 - Simple protective tube inserter - Google Patents

Description

The present invention relates to a simple protective tube inserter without a drive device for inserting or removing a protective tube that covers an electric wire erected on a utility pole or the like.

Protective pipes are used to protect overhead power lines from damage caused by contact with trees and the like. In addition, when working in the vicinity of an overhead electric wire, a protective pipe is also used to prevent the operator or working equipment from touching the electric wire.

FIG. 6 is a perspective view of the connected protective tube 101.

The main body 102 constituting the protective tube 101 shown in FIG. 6, the female fitting 103 formed on one end side of the main body 102, and the male fitting 104 formed on the other end of the main body 102 are It is formed using an insulating material that is elastic and flexible. As shown by the virtual line, these have an inner diameter capable of accommodating the overhead electric wire 100 inside, and a slit-shaped opening 107 is formed above the main body 102 in a straight line in the longitudinal direction. With such a material and shape, the overhead electric wire 100 can be covered by opening the opening 107 to accommodate the overhead electric wire 100 inside and closing it by the restoring force based on the elasticity of the protective tube 101. A pair of fin portions 109 extending in parallel to the enlarged diameter side of the cylinder are formed from the opposite end edges forming the opening 107, respectively.

Further, as shown in FIG. 6, a male fitting portion 104 is formed at one end of the protective tube 101 in the longitudinal direction, and another protective tube 101 having the male fitting portion 104 is formed at the other end. A female fitting portion 103 that can be connected to is formed. Each of these connected protective pipes 101 is set to a predetermined length, and a plurality of these connected male and female fitting portions 103 and 104 are added to each other to cover a long overhead electric wire 100.

Here, the male fitting portion 104 has a larger outer diameter than the main body portion 102. The female fitting portion 103 is formed with an accommodating portion 106 that can accommodate the male fitting portion 104 at the time of fitting and can be internally coupled. Therefore, the accommodating portion 106 of the female fitting portion 103 has a larger outer diameter than the male fitting portion 104.

Generally, when attaching the protective tube 101 as described above to the overhead electric wire 100, first the first protective tube 101 is inserted into the overhead electric wire 100, and then the tip of the second protective tube 101 is attached to the overhead electric wire 100. After being inserted and inserted into the overhead electric wire 100, these two protective tubes 101 are connected to each other by male and female fitting portions 103 and 104. Then, by repeating such an operation, a plurality of protective tubes 101 are inserted into the overhead electric wire 100.

Next, a device for inserting the protective tube 101 as described above into the overhead electric wire 100 will be described.

FIG. 7 is a front view of the conventional tube inserter 110. The pipe inserter 110 is fixed to the overhead electric wire 100 so as to be sandwiched between the electric wire holding angle 111 at the upper end and the guide main body 112. The protective tube 101 passed along the guide rod 113 extending from the guide main body 112 passes between the guide main body 112 and the drive tire 116. Then, the protective tube 101, which has been further displaced, is guided to the overhead electric wire 100 by expanding the opening 107 (see FIG. 6) by the tube expansion plate 115.

Here, the guide main body 112 is provided with rollers 127 on the side surface and the lower end side in order to reduce friction with the protective tube 101. As a result, the sliding contact resistance is reduced, and the protective pipe 101 can be smoothly inserted into the overhead electric wire 100 without losing the force applied from the drive tire 116. The tube inserter 110 as described above is described in Patent Document 1.

Japanese Unexamined Patent Publication No. 8-182135

The tube inserter 110 as described above requires a drive tire 116 and a device for driving the drive tire 116, and the total weight is increased by that amount. Further, in addition to increasing the weight of the entire tube inserter 110, it takes time to install the drive system, so that the work efficiency is not good. Therefore, in order to reduce the weight, it is most effective to omit the configuration of the drive system including the drive tire 116.

On the other hand, since the guide rod 113 is inclined with respect to the overhead electric wire 100 to be gripped, when the protective pipe 101 is abutted against the overhead electric wire 100 along the guide rod 113, the protective pipe 101 is large from the overhead electric wire 100 side. Receive reaction force. Therefore, in the configuration in which the drive tire 116 is omitted, it is necessary to work while pressing the protective tube 101 on the overhead wire 100 side so that the protective tube 101 does not fall off from the tube expansion plate 115.

Therefore, an object of the present invention is to provide a protective tube inserter capable of preventing the protective tube from falling off at the time of insertion while having a lightweight and compact configuration.

In order to achieve the above object, the simplified protective tube inserter of the present invention inserts a protective tube having a slit formed therein from an inclined direction with respect to an overhead electric wire while expanding a part of the slit. A sharp angle between the wire receiving portion that is applied to the overhead electric wire, the interrupt plate that is erected in the wire receiving portion and interrupts into the slit, and the wire receiving portion on one end side. A guide rail provided on the edge of the interrupt plate so as to form a corner and guides by sliding on the inner wall of the protective tube, and a guide rail provided at the corner of the interrupt plate toward one end side. It is provided with a widening tool which is formed so as to gradually increase in thickness and has a step extending in a steeper direction than the guide rail so as to cross between the guide rail and the wire receiving portion. It is characterized by that.

Further, in the simple protective tube inserter of the present invention, in addition to the above configuration, the fixed holding piece provided with the interrupt plate integrally and the electric wire holding portion for holding the overhead electric wire from two directions by the movable holding piece. And, on the movable holding one side of the electric wire holding portion, a support handle extending toward one end side for supporting the whole is provided.

Further, in the simplified protective tube inserter of the present invention, in addition to the above configuration, the region on one end side of the edge forming the step of the widening tool has a gentler angle with respect to the interrupt plate. It is characterized by being formed of.

As described above, according to the present invention, the widening tool provided at the corner on the interrupt plate between the guide rail and the wire receiving portion is formed with a step extending in a steeper direction than the guide rail. Therefore, the protective tube that slides on the widening tool while the slit is expanded is guided to the overhead wire side along the step. As a result, the protective tube can be pushed toward the overhead power line using the step as a scaffold, so that it is possible to prevent the protective tube from rising against the backlash when the tip hits the overhead line.

Further, according to the present invention, in addition to the above effect, the electric wire holding portion is provided with a support handle on the movable holding piece side opposite to the fixed holding piece integrally provided with the interrupt plate via the overhead electric wire. Therefore, it is possible to stabilize the protective tube inserter that is shaken by the weight of the protective tube that passes through a position away from the overhead electric wire. In addition, the support handle extends toward one end of the guide rail, which is the direction in which the installed overhead power line extends, and can maintain a substantially parallel relationship with the overhead power line. It is possible to grip stably at any angle without changing the posture.

Further, according to the present invention, in addition to the above effect, the edge formed by the step on the widening tool is on one end side of the guide rail, that is, on the insertion side of the protective tube with respect to the interrupt plate. It is formed at a gentle angle. As a result, the expanded protective tube can be smoothly separated from the widening tool and moved to the overhead power line side without being caught by the step.

It is the whole perspective view which looked at the protection tube inserter which concerns on this embodiment from the front side. It is an overall perspective view which showed the disassembled state of a part (the widening tool which will be described later) of the protective tube inserter of FIG. One of the widening tools is shown, (a) is a front view, (b) is a plan view, (c) is a bottom view, and (d) is an enlarged right side view. The state in which the protective tube inserter is used, (a) is the state where the tip of the protective tube is located on the interrupt plate, and (b) is the state where the tip of the protective tube is located on the widening tool. It is a figure shown. It is a figure which compares the state of the protection tube passing through a widening tool, (a) is the state which the tip of protection tube passes, and (b) is the state which the intermediate part of protection tube passes through. It is a perspective view which showed the conventional protection tube. It is a front view which showed the conventional tube inserter.

Hereinafter, the protective tube inserter of the present invention will be described with reference to the drawings.

FIG. 1 is an overall perspective view of the protective tube inserter 1 according to the present embodiment as viewed from the front side. Further, FIG. 2 is an overall perspective view showing a state in which a part of the protective tube inserter 1 (the widening tool 8 described later) of FIG. 1 is disassembled. Here, the direction in which the protective tube is inserted will be described as the insertion side. Further, for the protective tube appearing in the description, the protective tube 101 of FIG. 6 will be referred to as appropriate, and the configuration in which the fin portion 109 is formed in the slit 107 as shown in FIG. 6 will be described as an example. I do.

The protective tube inserter 1 has an electric wire holding portion 10 for sandwiching the overhead electric wire 100 from two directions. The wire holding portion 10 has an electric wire receiving metal fitting 2 as a fixed holding piece on the upper side, and a movable holding piece 14 facing the electric wire receiving metal fitting 2 on the lower side. The electric wire receiving metal fitting 2 has a groove formed downward so that the electric wire receiving metal fitting 2 can be applied along the outer surface of the overhead electric wire 100.

A substantially triangular plate-shaped interrupt plate 4 is erected on the wire receiving metal fitting 2. The interrupt plate 4 is provided to interrupt the slit 107 of the protective tube 101 to correct the twist (see FIG. 6).

A guide rail 6 is provided along the edge 4b at the upper end of the interrupt plate 4. The guide rail 6 is provided to enter the protective tube 101 together with the edge 4b at the upper end of the interrupt plate 4 and guide the protective tube 101 from the inside. In the configuration according to the present embodiment, a resin material having a small friction coefficient is used for the guide rail 6.

A widening tool 8 is provided at an acute-angled corner 4a formed by one end of the guide rail 6 with the electric wire receiving metal fitting 2. Although the widening tool 8 is not shown in FIG. 1, it is provided on both sides of the interrupt plate 4. The widening tool 8 is detachably attached to the interrupt plate 4. The state of being removed from the interrupt plate 4 is shown in the exploded view of FIG. It can be easily removed with two screws.

As can be seen in FIG. 1, the above-mentioned wire receiving metal fitting 2 is formed so as to increase the width in the vicinity of the widening tool 8. Since it is formed in this way, it is possible to prevent the outer cover of the overhead electric wire 100 from being damaged by the protective pipe 101 when the protective pipe 101 slides on the guide rail 6 and moves to the overhead electric wire 100 side.

The width of the widening tool 8 is defined by dimensions so that the protective tube 101 can be smoothly transferred to the overhead electric wire 100. Here, the dimension is set to be larger than the width of the guide rail 6 and slightly smaller than the width of the wire receiving metal fitting 2. Further, a step 8e (described later with reference to FIG. 3) inclined in the same direction as the guide rail 6 is formed on the side surface of the widening tool 8.

Next, the shape of the widening tool 8 will be described in detail.

FIG. 3 shows one of the two parts, the widening tool 8, in which (a) is a front view, (b) is a plan view, (c) is a bottom view, and (d) is a right side view. be. The right side view of (d) is enlarged for convenience of explanation. Further, the positional relationship is clearly shown by applying diagonal lines to the surface appearing by the step 8e mentioned in the above explanation. The insertion side of the protective tube 101 is on the left side of the paper.

First, referring to the front view of FIG. 3A, the widening tool 8 has four surfaces. Of these surfaces, the surface located on the rightmost side of the paper surface has a scooping portion 8a on which the protective tube 101 sent over the guide rail 6 (see FIG. 1) for insertion into the overhead electric wire 100 first rides on. It is a surface to be formed. The scooping portion 8a widens the slit 107 on the opening side of the protective tube 101 sent at the head so as to be scooped up.

The surface connected to the insertion side with respect to the scooping portion 8a is the surface formed by the first gradual change portion 8b. The first gradual change portion 8b is formed with a gentler inclination than the scooping portion 8a when viewed with reference to the interrupt plate 4 (see FIG. 1). The slit 107, which has been expanded by the scooping portion 8a, rides on the first gradual change portion 8b and is gradually expanded as the protective tube 101 moves to the insertion side.

The surface appearing above the first gradual change portion 8b is the side surface of the second gradual change portion 8c. The second gradual change portion 8c is formed so as to have a slightly larger inclination than the first gradual change portion 8b. As a result, a step 8e is formed between the two. This difference in the magnitude of the inclination angle is shown in FIG. 3 (b). Here, the inclined surface of the first gradual change portion 8b is represented by a dotted line. As described above, the step 8e formed by the difference in the size of the inclination angle is shown by diagonally slashing the bottom view of FIG. 3 (c). Similarly, in FIG. 3D, diagonal lines are provided on the surface forming the step 8e.

Finally, the surface appearing on the left side of the second gradual change portion 8c is the outer surface of the width defining portion 8d that defines the expansion width by the widening tool 8. Among the widening tools 8, the width defining portion 8d protrudes most in the width direction. In the configuration according to the present embodiment, the outer surface of the width defining portion 8d is formed substantially parallel to the interrupt plate 4.

From here, the operation in the state of use will be described.

4A and 4B show a state in which the protective tube inserter 1 is used, in which FIG. 4A is a state in which the tip of the protective tube 101 is located on the interrupt plate 4, and FIG. 4B is a state in which the protective tube 101 is placed on the widening tool 8. It shows the state where the tip of is located.

Since the slit 107 of the protective tube 101 made of the resin material is closed when no external force is applied, the slit 107 is sent while sliding against the interrupt surface until the widening tool 8 is reached. Since the guide rail 6 is formed to be slightly larger than the closed slit 107, it can reach the widening tool 8 without coming off even in a rough operation.

As shown in FIG. 4B, when the tip of the protective tube 101 reaches the widening tool 8, the opening side of the slit 107 first rides on the scooping portion 8a and moves to the first gradual change portion 8b, as described above. .. Here, returning to FIG. 3A, the ridgeline formed between the scooping portion 8a and the first gradual change portion 8b is inclined to the same side as the guide rail 6 and is more than the guide rail 6. It is formed with a steep slope. As a result, when moving from the scooping portion 8a to the first gradual change portion 8b, the slit 107 of the opening of the protective tube 101 is guided to the overhead wire 100 side along the ridge line. In this way, at least the protective tube 101 sent so as not to come off the guide rail 6 has the scooping portion 8a and the first gradual change portion 8b as the first step regardless of the height. The position is corrected to the side of the overhead wire 100 by the ridgeline between them.

Subsequently, when the slit 107 of the protective tube 101 passes over the first gradual change portion 8b, as described above, a step 8e is formed between the first gradual change portion 8b and the second gradual change portion 8c. The end of the slit 107 abuts. The abutting slit 107 is guided along the edge formed in the step 8e. Here, regarding this edge, the edge between the first gradual change portion 8b and the second gradual change portion 8c is referred to as the first edge 8f, and the edge between the width defining portion 8d and the first gradual change portion 8b is the first. We will call it 2 edges 8g.

That is, the protective tube 101 that has moved from the scooping portion 8a first moves on the first gradual change portion 8b along the first edge 8f. The first edge 8f is formed so as to be inclined in the same direction as the guide rail 6 and to extend in a direction of a steeper slope than the guide rail 6, similarly to the above-mentioned ridge line. However, since the gradient is smaller than that of the ridgeline, it is gently guided to the overhead wire 100 side.

At the stage where the protective tube 101 slides on the first gradual change portion 8b, a part of the fin portion 109 of the protective tube 101 begins to hang on the upper side of the wire receiving metal fitting 2. At the stage where the slit width 107 is being expanded from the scooping portion 8a to the first gradual change portion 8b, the fin portion 109 is widened to a width sufficient to follow the outer diameter of the overhead electric wire 100. In this way, since the expansion action on the overhead wire 100 side gradually becomes dominant, the protective tube 101 can be smoothly transferred from the widening tool 8 to the overhead wire 100 side.

In the configuration according to the present embodiment, as described above, the insertion side of the first edge 8f is connected to the second edge 8g having a gentler inclination than the first edge 8f with respect to the interrupt plate 4. Therefore, when the fin portion 109 is sufficiently on the overhead wire 100 side, the inner wall of the protective tube 101 can be separated from the first edge 8f without being caught. In this way, the edge formed on the widening tool 8 is formed so as to connect from the first edge 8f having a relatively large inclination to the second edge 8g having a small inclination on the insertion side, so that the tip of the protective tube 101 can be connected. A feature of the present invention is that the slit 107 can smoothly get over the overhead electric wire 100.

Next, the operation will be described from the front view with reference to FIG.

5A and 5B compare the states of the protective tube 101 passing through the widening tool 8. FIG. 5A is a state in which the tip of the protective tube 101 passes, and FIG. 5B is a state in which the intermediate portion of the protective tube 101 passes through. Is shown. Here, for convenience of explanation, the position of the protective tube 101 is represented by a dotted line, and the position of the fin portion 109 is represented by a diagonal line.

With reference to FIG. 5A, when the tip of the protective tube 101 is inserted, the protective tube 101 is straight along the guide rail 6 to a position where the edge of the opening 107 at the tip abuts on the overhead wire 100. It sticks out. Therefore, the protective tube 101 that protrudes and comes into contact with the electric wire receiving metal fitting 2 receives a force in a direction away from the overhead electric wire 100 due to the reaction force from the electric wire receiving metal fitting 2. In this way, at the stage where the cable has not sufficiently moved to the overhead wire 100 side, the protective pipe 101 is likely to come off from the guide rail 6 due to the thrust from the wire receiving metal fitting 2 (or the overhead wire 100), which has been a problem from the past. It has become. However, in the configuration according to the present embodiment, as described above, the first edge 8f is until the fin portion 109 is sufficiently hooked on the overhead wire 100 side, in other words, until the fin portion 109 intersects with the overhead wire 100. Since the action of pressing against the overhead power line 100 is effective, it is possible to prevent the protective tube 101 from falling off.

Next, referring to FIG. 5B, a slight bending occurs at the stage where the tip of the protective tube 101 takes in the overhead electric wire 100 and the intermediate position of the protective tube 101 passes near the widening tool 8. While following the guide rail 6, floating occurs at the intersection of the guide rail 6 and the wire receiving metal fitting 2. However, at this stage, since the protective tube 101 already holds the overhead electric wire 100 on the insertion side, the protective tube 101 does not fall off.

Here, the states of FIGS. 5A and 5B are compared with respect to the positional relationship between the fin portion 109 and the second edge 8g. In FIG. 5A, the upper end side of the fin portion 109, that is, the position of the slit 107 is moving away from the first edge 8f and moving onto the second edge 8g. That is, it is a stage where the tip of the protective tube 101 is being pushed up from the wire receiving metal fitting 2 (a stage where the resistance is the largest), and it is also a stage where sufficient force is obtained to suppress the lifting.

On the other hand, in FIG. 5B, although the protective tube 101 is slightly lifted, a force is applied to the opened slit 107 to close by the restoring force in the portion where the protective tube 101 has already moved to the aerial wire 100 side. There is. That is, since the lifting is suppressed by this restoring force, the friction between the widening tool 8 and the protective tube 101 becomes a problem at this stage. However, as described above, there is almost no catching such as friction with the first edge 8f between the second edge 8g on which the fin portion 109 overlaps. Therefore, once the overhead electric wire 100 is taken into the protective tube 101, the friction with the first edge 8f is sharply reduced, so that the protective tube 101 can be fed out with almost no resistance.

As described above, according to the protective tube inserter 1 according to the present embodiment, damage to the protective tube 101 is prevented, floating due to abutting against the overhead electric wire 100 is prevented, and catching is also effective. It is possible to smoothly feed the protective tube 101 while suppressing the target.

In this way, since the guide rail 6 can be arranged above the overhead electric wire 100 and the protective tube 101 can be smoothly inserted, it is used in many configurations in which the conventional guide rail 6 is arranged below. It is not necessary to arrange a guide roller or the like so as to face the guide rail 6, and the whole can be configured simply and lightweight.

Further, even when the protective tube inserter 1 of the present embodiment is used by inverting the whole so that the guide rail 6 is located below the overhead electric wire 100, the first edge 8f and the second edge 8g are used. Since the force acts to lift the protective tube 101 toward the upper overhead electric wire 100 side by (mainly the first edge 8f), it is possible to work safely without dropping the protective tube 101.

By the way, when the work is performed in a state where the guide rail 6 is arranged above the overhead electric wire 100, the weight of the protective pipe 101 is added to the guide rail 6.

On the other hand, since the protective tube inserter 1 is fixed to the overhead wire 100 by the wire sandwiching portion 10, one side of the guide rail 6 (opposite to one end on the corner 4a side) far away from the overhead wire 100. The other end side of) tends to be unstable.

However, in the configuration according to the present embodiment, since the support handle 16 is provided on the movable holding piece 14 side of the electric wire holding portion 10 (see FIG. 1), the runout of the protective tube 101 on the guide rail 6 side is effective. It is possible to suppress it to.

Further, since the extending direction of the support handle 16 is arranged along the extending direction of the overhead electric wire 100, when the movement of the protective tube inserter 1 to be rotated around the overhead electric wire 100 is suppressed, the movement of the protective tube inserter 1 is suppressed with respect to the overhead electric wire 100. The parallel posture is maintained. As a result, it is possible to prevent the wrist that grips the support handle 16 from being unnaturally squeezed.

The configuration described above is an embodiment of the present invention, and includes the following modifications.

In the above embodiment, the edge formed on the side surface of the widening tool 8 has a second edge 8g having a gentler slope on the insertion side of the first edge 8f having a relatively steep slope with respect to the interrupt plate 4. A series of configurations is shown as an example. However, this edge may be formed linearly.

Further, in the above-described embodiment, a configuration in which the scooping portion 8a is formed continuously with the first gradual change portion 8b of the widening tool 8 is shown as an example. However, the interrupt plate 4 may be directly connected to the first gradual change portion 8b. By forming the scooping portion 8a, it is possible to gently incline the first gradual change portion 8b.

Further, in the above embodiment, the support handle 16 is shown as an example of a configuration in which the support handle 16 is arranged so as to extend in a direction substantially parallel to the overhead electric wire 100. However, the support handle 16 does not have to be completely parallel to the overhead wire 100 as long as it extends toward the insertion side, which is one end side of the guide rail 6.

Further, in the above embodiment, an example is shown in which the electric wire receiving metal fitting 2 is configured as a fixed holding piece provided in the electric wire holding portion 10 so as to face the movable holding piece 14. However, the electric wire receiving metal fitting 2 provided for protecting the overhead electric wire 100 and the fixed holding piece for fixing the overhead electric wire 100 may be provided separately.

Since the protective tube inserter 1 of the present invention can smoothly slide the protective tube 101 with respect to the overhead electric wire 100, it is useful not only for inserting the protective tube 101 but also for removing the protective tube 101. Is.

1 Protective tube inserter 2 Wire receiving bracket (wire receiving part, fixed holding piece)
4 Interruption plate 4a Corner 4b Edge 6 Guide rail 8 Widening tool 8a Scooping part 8b 1st gradual change part 8c 2nd gradual change part 8d Width regulation part 8e Step 8f 1st edge 8g 2nd edge 10 Wire holding part 14 Movable holding piece 16 Support handle 100 Overhead electric wire 101 Protective tube 102 Main body 103 Female fitting 104 Male fitting 106 Housing 107 Opening (slit)
109 Fin 110 Tube inserter 111 Angle 112 Guide body 113 Guide rod 115 Tube expansion plate 116 Drive tire 127 Roller

Claims (3)

A protective tube inserter that inserts a protective tube having a slit formed into an overhead electric wire from an inclined direction while expanding a part of the slit.
The electric wire receiving part allocated to the overhead electric wire and
An interrupt plate that is erected on the wire receiving portion and interrupts into the slit,
A guide rail provided on the edge of the interrupt plate so as to form an acute-angled corner with the wire receiving portion on one end side, and slidingly contacting and guiding the inner wall of the protective pipe.
It is provided at the corner of the interrupt plate, is formed so as to gradually increase in thickness toward one end side, and is formed from the guide rail so as to cross between the guide rail and the wire receiving portion. A simple protective tube inserter characterized by having a widening tool with a step extending in the direction of a steep slope. A fixed holding piece integrally provided with the interrupt plate, and an electric wire holding portion for holding the overhead electric wire from two directions by a movable holding piece.
The simple protective tube insertion according to claim 1, wherein a support handle for supporting the entire wire is provided on one side of the movable pinching portion of the wire pinching portion, which is extended toward one end side. vessel. The simple aspect according to claim 1 or 2, wherein the region on one end side of the edge forming the step of the widening tool is formed at a gentle angle with respect to the interrupt plate. Type protective tube inserter.

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