JP7389435B2 - Insulator replacement aid - Google Patents

Description

The present invention relates to an insulator replacement aid used when replacing an insulator that supports a feeder line or the like that passes through a building such as an overpass.

In railway station buildings, suspension lines such as feeder lines are supported via insulators to buildings such as overpasses. These insulators are replaced if they are significantly damaged or dirty during maintenance or inspection. Tension or pressure from the suspension wire is often applied to the insulator supporting the suspension wire. Therefore, in order to carry out the replacement work, it is necessary to release the insulator from these external forces in advance.

When tension is present in the insulator, an insulator replacement tool 100 as shown in FIG. 11 is used to support the suspension wire so as to press it against the insulator to reduce the burden of replacement work. A telescopic portion 102 is provided above the support rod 101, and a suspension wire support portion 103 capable of holding a suspension wire is provided at the tip of the telescopic portion 102. The operator can push up the hanging wire using the hanging wire support section 103 on a workbench of a land rail vehicle or the like while supporting the handle 104 provided between the support rod 101 and the telescopic section 102. By pushing up the hanging wire in this manner, the tension applied to the insulator is released, making it possible to easily replace the insulator. Such a technique is described in Patent Document 1.

Similarly, when tension is generated in the insulator, as shown in FIG. May be used. The tension applied to the insulator 52 is released by pulling the hanging wire 51 toward the insulator 52 by contracting the wire tensioner 201 provided in the feeder wire temporary support 200, thereby facilitating the replacement of the insulator. Such a technique is described in Patent Document 2.

On the other hand, if the insulator is under pressure from the overhead wire, use a tool equipped with a wire tensioner 201, such as the feeder wire temporary support 200 shown in FIG. , construction methods such as pulling the suspension wire toward the land rail vehicle side are sometimes adopted.

JP2010-208423A JP 2017-039353 Publication

As with the conventional technology described above, in the insulator replacement auxiliary work that uses the workbench of a land rail vehicle as a foothold to release the insulator from external force, it is difficult to predict the magnitude of the force that will be applied to the workbench, resulting in damage to the workbench. There is a potential safety issue.

Furthermore, in the configuration shown in FIG. 12, the feeder wire temporary support 200 may not be easily attached to the cross arm fixing part 202 because a U bolt cannot be installed. In such cases, a mounting rope or the like is often used, but it is not easy to attach this mounting rope or the like to the object on which the insulator is to be installed.

Therefore, the present invention provides an insulator replacement aid that can be easily attached to an insulator installation target without using a special fixture, and can release an insulator from external force regardless of tension or pressure. The purpose is to

In order to achieve the above object, the insulator replacement aid of the present invention assists the insulator replacement work by temporarily supporting a hanging wire supported by an insulator installed on an installation target having a plate-shaped portion. The insulator replacement aid includes a hanging wire gripping part that grips the hanging wire, a telescopic part having a telescopic mechanism in which the hanging wire gripping part is connected to one end side, and a stretching direction of the telescopic part. An insertion part extending in the radial direction of the shaft and having a gap formed on the distal end side into which the plate-shaped part of the installation object extending in the circumferential direction of the shaft can be inserted. do.

Further, the insulator replacement aid of the present invention is characterized in that, in addition to the above configuration, the insertion portion is provided between the one end and the other end.

Further, in addition to the above configuration, the insulator replacement aid of the present invention is characterized in that the gap of the insertion portion is formed so as to cut inward in the radial direction.

In addition to the above-mentioned configuration, the insulator replacement aid of the present invention is also provided with a sliding structure in which the insertion portion can slide relative to the expansion and contraction portion along a virtual plane orthogonal to the expansion and contraction direction. It is characterized by having a section.

As described above, according to the present invention, since the suspension line gripping section is provided on one end side of the extensible section, the extensible section can be expanded and contracted based on the suspension wire gripped by the suspension wire gripping section. An insertion part extends in the radial direction with the expansion/contraction direction as the axis, and a plate-shaped part of the installation target that extends in the circumferential direction with the expansion/contraction direction as the axis can be inserted into the tip side of this insertion part. A gap is formed that allows for Thereby, by inserting the plate-shaped portion of the insulator to be installed into the gap, the expandable portion can be fixed at the other end side different from the suspension wire. When the extensible section is expanded or contracted in this state, the extensible section receives tension or pressure as a reaction force using the hanging wire gripping section as a foothold. At this time, the gap on the other end side of the expandable portion is twisted to strengthen the engagement with the plate-like portion. In this way, it is possible to strengthen the fixation of the insertion part to the object to which the insulator is installed by utilizing the expansion and contraction movement of the expansion and contraction part, so that work such as fastening becomes unnecessary and work efficiency can be improved.

Further, according to the present invention, in addition to the above-mentioned effects, since the insertion part is provided between one end of the telescoping part and the other end, the insulator replacement aid can be attached to the hanging wire in a narrower range than the telescoping part. and can be fixed to the installation target. In other words, it becomes possible to expand and contract with a stroke larger than the distance between the hanging wire and the installation target.

Further, according to the present invention, in addition to the above-mentioned effects, the gap of the insertion part is cut inward in the radial direction with the expansion and contraction direction as the axis, so the gap part is attached to the plate-shaped part to be installed. Fixing to the installation target side is completed by simply pressing the insertion part so that it sticks out towards the user.

Further, according to the present invention, in addition to the above-mentioned effects, when the insertion part is attached to an installation target such as a arm arm, the telescopic part can be slid on a sliding part in a virtual plane orthogonal to the direction of expansion and contraction. Therefore, even if the suspension wire is arranged at an angle with respect to the cross arm, the alignment of the suspension wire gripping portion with respect to the suspension wire can be adjusted by sliding along the imaginary plane.

FIG. 1 is an overall perspective view of an insulator replacement aid according to a first embodiment. It is an enlarged view of a hanging wire grip part and its vicinity. FIG. 3 is an enlarged plan view of the contact portion. It is a side view of an insertion part. FIG. 2 is an overall perspective view showing the insulator replacement aid in use. It is a side view which shows the insertion part in a use state, (a) shows the state when pressure is released, and (b) shows the state when tension is released. Modified examples of the insertion part are schematically shown, with (a) showing an insertion part with a slit formed on the lower side, and (b) showing an insertion part with a slit formed in a direction away from the telescopic axis. be. FIG. 7 is an overall perspective view of an insulator replacement aid according to a second embodiment. FIG. 9 is an overall perspective view showing the state in which the insulator replacement aid of FIG. 8 is in use. The insulator replacement aid shown in Fig. 8 is in use, (a) is when the cross arm and the suspension line are arranged orthogonally, (b) is when they are arranged at an angle, and (c) is at an inclination opposite to (b). FIG. 3 is a plan view showing the arrangement. It is a figure showing a conventional insulator replacement tool. It is a figure which shows the conventional feeder wire temporary support tool.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An insulator replacement aid according to an embodiment of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is an overall perspective view of an insulator replacement aid 1 according to a first embodiment.

The insulator replacement aid 1 includes an extensible part 2 that can be expanded and contracted. The extendable part 2 includes an input part 2a on the lower side surface for inputting rotational force. A ratchet-type handle 10 that applies rotational force is detachably attached to the input section 2a. By rotating the handle 10, the telescopic section 2 can be telescopically operated. Since the handle 10 is detachably provided, it can be stored compactly when being carried around, and it is also possible to use an electric tool instead of the manual handle 10 depending on the situation.

Although internal structures such as the telescoping mechanism are not shown in the drawings, the configuration according to this embodiment has a configuration in which rotational force is transmitted by two bevel gears whose rotation axes are arranged relative to each other at 90 degrees. It becomes. The transmitted rotational force causes the nut side of the feed screw mechanism to move up and down, allowing the extendable portion to extend and contract.

A hanging wire gripping part 4 is provided at one end of the telescopic part 2, which is the lower side, and a contact part 8, which is brought into contact with a wall surface, is provided at the other end, which is the upper side.

FIG. 2 is an enlarged view of the hanging wire gripping part 4 and its vicinity. Refer to FIG. 2 together with the overall perspective view of FIG. 1.

The hanging wire gripping section 4 includes a U-shaped frame section 4a with an open bottom, and a closing pin 4b for opening and closing the open portion of the frame section 4a. By sliding the closing pin 4b in the lateral direction, the lower side of the frame portion 4a can be opened and closed. Since the annular engaging portion 4b1 is provided on the outer shaft end of the closing pin 4b, it is possible to easily open and close the closing pin 4b by hooking a remote control tool etc. even from a remote position. Since the plunger 4b2 is provided on the inner shaft end side opposite to the engaging portion 4b1, the closed state can be stably maintained. Moreover, since the engaging portion 4b1 is formed in an annular shape, it is easy to twist. Thereby, when the tool hooked on the engaging portion 4b1 is rotated around the axis of the closing pin 4b, the plunger 4b2 can be easily released and can be pulled out as it is.

With the above configuration, the hanging wire gripping section 4 can receive and grip the hanging wire from below with a simple operation.

FIG. 3 is a plan view of the insulator replacement aid 1. Refer to FIG. 3 together with the overall perspective view of FIG. 1.

FIG. 3 shows the upper abutment part 8. The contact portion 8 is formed with a flat contact surface 8a for stabilizing the insulator by contacting it with a wall surface such as the lower part of an overpass to which the insulator is installed. In the configuration according to this embodiment, the contact surface 8a is formed in a plane perpendicular to the direction of expansion and contraction. The position of the expandable part 2 is indicated by a dotted line inside the abutting part 8. As shown in FIG. 3, if the elastic part 2 is configured to be included within the range of the abutment part 8 in plan view, it will be stable even when force is applied to the elastic part 2.

Further, in the configuration according to the present embodiment, the insertion portions 6 connected from the contact portion 8 to the armrest extend in the radial direction at intervals in the circumferential direction with the expansion and contraction direction of the expansion and contraction portion 2 as an axis. There are two parallel to each other. If the length from the extensible part 2 to the tip of the insertion part 6 is designed to exceed the radius of the insulator to be replaced, the extensible part 2 can be installed without interfering with the insulator.

Here, the circumferential direction refers to the tangential direction of the circumference, not the arc-shaped direction centered on the axis in the expansion/contraction direction. Thereby, the installation object, such as a armrest inserted into the insertion part 6, and the telescopic part 2 are arranged in a three-dimensional intersection.

FIG. 4 is a side view of the insertion part 6. Here, FIG. 4 will be additionally referred to in addition to FIGS. 1 and 3.

The insertion part 6 extends below the contact part 8. With this structure, even if the abutment part 8 is placed in contact with a wall surface such as the lower part of an overpass where the insulator is to be installed, only the insertion part 6 will remain floating from the wall surface. It's not a hindrance.

In addition, if the insertion part 6 is provided at a lower position than the contact part 8, it is possible to use the extendable part 2 with a length that exceeds the distance between the hanging wire and the object for installing the insulator, such as a cross arm. . That is, since it is possible to employ a long stretchable part 2, it is possible to set a large extension margin. This is an advantageous structure when it is desired to move the suspension line by a large distance compared to the distance between the insulator installation target and the suspension line.

Furthermore, it can be seen that the insertion portion 6 extends outward in a radial direction with the expansion and contraction direction of the expansion and contraction portion 2 as an axis. A slit 6a (gap) into which a horizontally expanding plate member can be inserted is formed in the two insertion portions 6. At least the interval L1 between these slits 6a is formed to a size that can accommodate a plate-shaped horizontal portion of a arm made of angle material, which will be described later.

The depth L2 of this slit 6a is set to a dimension that will not easily come off even if the insertion part 6 is inclined relative to the inserted plate-like member at an angle other than the insertion direction. It is necessary to do so. Therefore, it is desirable to set the depth L2 to be at least larger than the interval L1 between the slits 6a.
Next, the state of use of the insulator replacement aid will be explained.
FIG. 5 is an overall perspective view showing the insulator replacement aid 1 in use. In this embodiment, a case is shown in which the cross arm 50 on which the insulator 52 is installed is made of an angle material.
The insulator 52 is suspended below the cross arm 50 via an insulator mounting fitting 53. A suspension line 51 such as a feeder line is supported by a parallel clamp 54 provided at the lower end of the insulator 52. The direction in which the cross arm 50 extends and the direction in which the suspension wire 51 extends are in a three-dimensional intersecting positional relationship such that they are perpendicular to each other in a plan view. The insulator 52 used in this manner is often subjected to external force, either tension or pressure, from the suspension wire 51.

Here, the insulator replacement work using the insulator replacement aid 1 will be explained step by step.
<1> First, the plate-shaped horizontal portion 50b of the arm 50 is inserted into the slit 6a of the insertion portion 6, and the upper part of the insulator replacement aid 1 is attached to the arm 50. In the configuration according to the present embodiment, the interval L1 (see FIG. 4) between the slits 6a of the insertion portion 6 is set to a size that allows the insulator mounting bracket 53 to be inserted together with the horizontal portion 50b of the cross arm 50. , the insertion part 6 can be installed near the insulator 52.
<2> Then, the closing pin 4b of the lower hanging wire gripping part 4 is opened, and the hanging wire 51 is accommodated from below. As described above, the depth L2 (see FIG. 4) of the slit 6a is set to a dimension that prevents the insertion portion 6 from easily disengaging from the horizontal portion 50b of the cross arm 50, so that the suspension wire When storing the hanging wire 51 in the grip part 4, there is no need to worry about the insertion part 6 installed in step <1> coming off.
<3> Next, the extensible part 2 is arranged perpendicularly to the suspension wire 51 on the side of the insulator 52. As explained using FIG. 3, the tip of the insertion part 6 extends to a position sufficiently far away from the telescopic part 2, so that the telescopic part 2 can be placed without interfering with the insulator 52. can.
<4> Here, the length of the extendable portion 2 is adjusted by rotating the handle 10. Since the extensible portion 2 is arranged so that the direction of expansion and contraction is perpendicular to the suspension line 51, force can be efficiently and stably applied to the suspension line 51 by the expansion and contraction operation.
<5> When the external force applied to the insulator 52 is pressure, the extendable portion 2 is operated to extend in order to push back the suspension wire 51. Further, when the external force applied to the insulator 52 is tension, the extensible portion 2 is operated to contract in order to pull the hanging wire 51. In this way, the insulator 52 is released from external forces.
<6> The insulator is replaced in a state where it is released from the external force caused by the hanging wire 51, and after the replacement, the extensible portion 2 is returned to its original length and the insulator replacement aid 1 is removed.

The insulator replacement work is completed by the steps <1> to <6> as described above.

If the insulator replacement aid 1 according to the present embodiment is used, the installation can be completed by simply engaging the slit 6a with the object for installing the insulator 52, such as the cross arm 50, without any fixing work, so the work time is reduced. will be significantly shortened. Further, as the force applied from the insertion part 6 in the direction of twisting the arm arm 50 increases with the expansion and contraction movement, the engagement between the two is also strengthened, making it possible to perform stable work. . Furthermore, if the depth L2 of the slit 6a is designed to be deep enough, even if the operator slips his/her hand, the plate-like part of the armrest 50 will not fall out of the slit 6a. It can be prevented.

Note that in the configuration according to this embodiment, the contact portion 8 is provided on the proximal end side of the insertion portion 6. Therefore, if there is a downward facing wall near the top of the cross arm 50, instead of attaching it to the cross arm 50 on the insertion part 6 side, you can simply make the abutting part 8 contact the wall surface, and the suspension wire 51 can be It is possible to receive the reaction force of In this case, the temporary installation is completed simply by storing the hanging wire 51 in the lower hanging wire gripping part 4, so that the working time can be further shortened depending on the situation.

Next, the function of the insertion portion 6 will be explained.

FIG. 6 is a side view of the insertion portion 6 in use. (a) shows the state of the insulator 52 when the pressure is released, and (b) shows the state when the tension of the insulator 52 is released. The cross arm 50, which is an angle member, is shown with diagonal lines.

As shown in FIG. 6(a), in order to release the pressure from the hanging wire, it is necessary to push the hanging wire away from the insulator 52 side and extend the extendable portion 2. When the telescopic portion 2 extends, the base end side of the insertion portion 6 extending from the telescopic portion 2 via the contact portion 8 is lifted due to the reaction force from the hanging wire. When the base end side is lifted, the inner side of the rotated slit 6a is pressed against different positions on the upper and lower surfaces of the horizontal portion 50b of the armrest 50 (positions indicated by arrows in FIG. 6(a)). In this way, the engaged state is formed and stabilized, and the reaction force from the suspension wire transmitted via the expansion/contraction section 2 can be received.

On the other hand, as shown in FIG. 6(b), in order to release the tension applied to the insulator 52, it is necessary to contract the telescopic portion 2 by pulling the hanging wire toward the insulator 52. When the extensible part 2 contracts, the proximal end side of the insertion part 6 is pulled down by the hanging wire that is being pulled back. When the base end side is pulled down, the inside of the rotated slit 6a is in the state shown in (a) at different positions on the upper and lower surfaces of the horizontal part 50b of the armrest 50 (positions indicated by arrows in FIG. 6(b)). is imposed in the opposite relationship. In this way, the engaged state is similarly established and stabilized, and the reaction force from the suspension line can be received.

(Modified example of insertion part 6)
FIG. 7 shows a modification of the insertion part 6 of the insulator replacement aid 1 shown in FIG. FIG. 4 is a schematic diagram showing an insertion portion 40 in which a slit 40a is formed in the radial direction. The expansion/contraction direction and the radial direction of the expansion/contraction section 2 are indicated by arrows.

Even if the slit 30a is formed in the expansion/contraction direction as shown in FIG. 7(a), the engaged state can be formed by rotating the insertion portion 30, as in the example shown in FIG. If there is a space above the armrest 50 to insert the insertion part 30, the vertical part 50a of the armrest 50 can be inserted into the slit 30a by hooking it from above. In this case, using the insertion part 30 as a guide, it is easy to guide it to the slit 30a position by sliding the upper part of the armrest 50 (the upper end of the vertical part 50a) from the base end side to the distal end side in the radial direction. This is advantageous in situations where visibility is poor.

Even if the slits 40a are formed in the opposite direction as shown in FIG. 7(b), the engaged state can be formed in the same way. Similarly to FIG. 7(a), when the arm 50 is slid downward (the lower surface of the horizontal portion 50b) from the base end side in the radial direction to the distal end side of the insertion portion 40, it is guided to the slit 40a position. , can be easily engaged.

(Second embodiment)
An insulator replacement aid 21 according to a second embodiment will be explained. The same components as those in the first embodiment are designated by the same reference numerals.

FIG. 8 is an overall perspective view of an insulator replacement aid 21 according to the second embodiment.

In the configuration according to this embodiment, the configuration of the contact portion 28 is different from that in the first embodiment. A long hole 28b serving as a sliding portion is formed in the contact surface 28a, which is a flat surface. The elongated hole 28b is formed to extend parallel to the direction in which the two insertion portions 6 are arranged. At one end of the telescopic part 2, a suspension wire gripping part 4 is provided as in the first embodiment, but the other end side is slidable in the elongated hole 28b and in the telescopic direction. It is connected to the abutting portion 28 so as to be rotatable around an axis.

With this configuration, the direction in which the closing pin 4b of the hanging wire gripping part 4 extends and the direction in which the two insertion parts 6 are arranged can be arranged in different directions. As a result, as will be described later with reference to FIG. 9, even if the cross arm and the suspension wire are not arranged orthogonally, the orientation of the suspension wire gripping portion 4 can be freely adjusted with respect to the arrangement direction of the insertion portions 6. It is possible to arrange it at an angle.

Next, the state of use of the insulator replacement aid 21 will be explained.

FIG. 9 is an overall perspective view showing the insulator replacement aid 21 in use.

FIG. 9 shows an example in which the suspension wire 51 is stretched at an angle other than 90 degrees with respect to the cross arm 50 when viewed from above. In the insulator replacement aid 21 shown in FIG. 8, the extendable portion 2 was located at the center of the elongated hole 28b of the contact portion 28. As shown in FIG. However, FIG. 9 shows a state in which the extensible portion 2 is arranged closer to one side of the elongated hole 28b in accordance with the inclined suspension wire 51. It can be seen that the extensible part 2 changes its arrangement along the elongated hole 28b, and the orientation of the hanging wire grip part 4 also changes. The suspension wire gripping section 4 can stably grip the suspension wire 51 by arranging the closing pin 4b orthogonal to the suspension wire 51.

As described above, since the telescopic section 2 can be moved in accordance with the position where the suspension wire 51 is stretched, it is possible to always arrange the telescopic section 2 perpendicularly to the suspension wire 51. Therefore, since the amount of expansion and contraction can be minimized, the expansion and contraction section 2 can be designed compactly, and the expansion and contraction movement is reduced, so that work efficiency is improved.

FIG. 10 shows the usage state of the insulator exchange aid 21, (a) shows the case where the cross arm 50 and the suspension line 51 are arranged orthogonally, and (b) shows the case where the cross arm 50 and the suspension line 51 are arranged at an angle. In this case, (c) is a plan view in which the cross arm 50 and the hanging wire 51 are arranged at an inclination opposite to that in (b).

As shown in FIG. 10(a), when the cross arm 50 and the suspension wire 51 are disposed orthogonally, when the telescopic portion 2 is placed at the center position of the elongated hole 28b, the telescopic portion 2 is connected to the suspension wire 51 and the cross arm 51. can be placed perpendicular to This makes it possible to apply a force parallel to the external force being applied to the insulator 52.

As shown in FIG. 10(b), when the cross arm 50 and the suspension line 51 are arranged at an angle, the telescopic part 2 is installed by sliding it in the elongated hole 28b to a position where it extends vertically from directly above the suspension line 51. . Thereby, the extensible portion 2 is arranged perpendicular to both the cross arm 50 and the hanging wire 51, and it becomes possible to apply a force parallel to the external force being applied to the insulator 52. Since the extensible portion 2 is configured to be able to slide in the elongated hole 28b and also rotate around its axis, it is possible to align the orientation of the hanging wire gripping portion 4 with the hanging wire 51.

In the case of FIG. 10(c), since the inclination is opposite to that of FIG. 10(b), it is installed by sliding inside the long hole 28b in the opposite direction of that of FIG. 10(b). This makes it possible to apply a force parallel to the insulator 52, as in (b).

As shown in FIGS. 10A to 10C, if the elongated hole 28b is arranged to overlap the suspension wire 51 in plan view, the distance between the contact portion 28 and the suspension wire 51 is the shortest position, that is, It is possible to install the expandable portion 2 at a position parallel to the insulator 52.

The configuration described above is an example of the present invention, and the following modifications are also included.

In the embodiment described above, the configuration in which two insertion portions 6 are provided is shown as an example. However, it is sufficient if it is provided at least one location.

In the embodiment described above, the configuration in which the insertion portion 6 extends from the contact portion 8 is shown as an example. However, the insertion portion 6 and the contact portion 8 may be configured separately.

In the above embodiment, the slit 6a of the insertion portion 6 is shown as a cut formed in a plate-like member. However, as long as it is a gap into which a plate member can be inserted, it may be a gap formed between opposing flat plates.

In the above-described embodiment, the interval L1 between the slits 6a of the insertion portion 6 is formed uniformly from the opening side to the back side. However, as long as the structure is such that when a force in the torsional direction is applied to the insertion portion 6, the inserted plate-like member is engaged, the intervals do not need to be equal.

In the embodiment described above, the configuration in which two insertion portions 6 are provided in parallel is shown as an example. However, the insertion parts 6 do not have to be parallel to each other. Moreover, it does not have to be formed in a straight line in plan view. For example, the ends of the insertion portions may be formed so as to open relative to the armrest.

In the above-described embodiment, the suspension wire gripping section 4 has shown as an example a configuration in which the suspension wire is accommodated from below. However, it may be accommodated from the side instead of from the bottom.

In the above-described embodiment, the suspension wire gripping section 4 is constituted by a U-shaped frame body and the closing pin 4b. However, a clamp-type gripping structure may be used as long as it is configured to stably grip the hanging wire in order to release the insulator from external forces. Moreover, the closing pin 4b may have a structure in which it is opened and closed by turning instead of a structure in which it slides.

In the embodiments described above, the telescoping section 2 has a cylindrical telescoping shaft as an example. However, it may be a pantograph type extensible part. Alternatively, a telescoping mechanism using a combination of a rack and a pinion may be employed.

In the above-described embodiment, the contact portion 8 has a flat top surface. However, it does not need to be flat as long as the structure can stabilize the contact state without skidding. For example, it may include a concavo-convex shape that can fit into the contact target.

In the embodiment described above, the configuration in which the insertion portion 6 is provided between the hanging wire gripping portion 4 and the contact portion 8 is shown as an example. However, it may be provided at any position as long as it is between one end and the other end of the extensible portion 2. For example, a configuration may be adopted in which the insertion portion 6 and the contact portion 8 are provided at the same height position.

In the above embodiment, the contact surface 8a is formed over the entire upper surface of the contact portion 8 as an example. However, as long as the size includes the expandable portion 2 inside, at least in plan view, it does not have to cover the entire area. Here, "included inside" does not mean completely included, but means inside the expanding range of the contact surface 8a, and there is no need for them to overlap. For example, in a plan view, the expandable portion may be located in a space inside a contact surface formed in an annular shape.

In the second embodiment described above, the elongated hole 28b of the contact portion 28 is formed in a straight line parallel to the arrangement of the insertion portions 6 as an example. However, the holes do not have to be parallel to the arrangement of the insertion portions 6, and may be curved long holes. For example, if it is formed into an arc shape with the insulator at the center, the extendable part can always be installed at the same distance from the insulator even if the suspension wire is stretched at an angle with respect to the cross arm.

Since the insulator replacement aid of the present invention can be fixed by a combination of a plate-like member and a slit, it is particularly useful in insulator replacement work where a cross arm made of an angle member or the like having a plate-like structure is to be installed.

1, 21 Insulator replacement aid 2 Telescoping part 2a Input part 4 Hanging wire gripping part 4a Frame 4b Closing pin 4b1 Engagement part 4b2 Plunger 6 Insertion part 6a Slit 6b Rib 8 Contact part 8a Contact surface 10 Handle 28 Abutment Contact part 28a Contact surface 28b Long hole (sliding part)
50 Cross arm 50a Vertical part 50b Horizontal part 51 Hanging wire 52 Insulator 53 Insulator mounting bracket 54 Parallel clamp 100 Insulator replacement tool 101 Support rod 102 Expandable part 103 Hanging wire support part 104 Handle 200 Feeder wire temporary support 201 Wire tensioner 202 Bracelet fixing part L1 Distance L2 Depth

Claims (4)

An insulator replacement aid that assists the insulator replacement work by temporarily supporting a hanging wire supported by an insulator installed on an installation target having a plate-shaped part,
a suspension wire gripping section that grips the suspension wire;
an extensible part having an extensible mechanism, the suspension wire gripping part being connected to one end side;
an insertion part that extends in a radial direction with the expansion and contraction direction of the expansion and contraction part as an axis, and has a gap formed on the distal end side into which the plate-shaped part of the installation target that extends in the circumferential direction of the shaft can be inserted; An insulator replacement aid characterized by comprising: The insulator replacement aid according to claim 1, wherein the insertion portion is provided between the one end and the other end. The insulator exchange aid according to claim 1 or 2, wherein the gap of the insertion portion is formed so as to cut inward in the radial direction. Any one of claims 1 to 3, wherein the insertion portion includes a sliding portion that is capable of sliding relative to the expansion and contraction portion along a virtual plane orthogonal to the expansion and contraction direction. The insulator replacement aid described in item 1.

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