Attachment / detachment tool

Abstract

To provide an attaching / detaching tool capable of attaching / detaching a falling prevention tool to / from a wire protection tube by an indirect construction method.SOLUTION: An attaching / detaching tool for attaching a falling prevention tool to a wire protection tube or detaching the falling prevention tool from the wire protection tube, includes a base part, and a first locking part and a second locking part that are disposed on the base part. In a holding state where the falling prevention tool is held by the attaching / detaching tool, the first locking part locks a leg portion of the falling prevention tool while the second locking part locks a hook piece of the falling prevention tool. In the holding state, the falling prevention tool is disposed with respect to the attaching / detaching tool in such a way that an opening portion of the falling prevention tool through which the wire protection tube is taken in / out is directed toward a side opposite to the base part. With the first and second locking parts, the attaching / detaching tool is inhibited from moving in a direction that intersects with the axial direction of a ring formed of a circle that partly includes an arc of a circular arc portion of the falling prevention tool in the holding state.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present disclosure relates to an attachment / detachment tool for attaching a fall prevention device to a wire protection tube that protects electric wires installed between utility poles and prevents the wire protection tube from falling off the electric wire, or for detaching the fall prevention device from the wire protection tube. [Background technology]

[0002] Conventionally, in order to prevent electrical accidents caused by direct contact with electric wires strung between utility poles by tree branches or cranes working on construction sites, electric wire protection conduits have been used to protect the electric wires by covering the outside of the electric wires. Here, a commonly used electric wire protection conduit will be explained using Figures 15 and 16. Note that Figure 15 is an external view of the electric wire protection conduit in a state in which it is covered over the electric wires, and Figure 16 is a cross-sectional view taken along line XVI-XVI of Figure 15.

[0003] As shown in Figures 15 and 16, this wire protection tube 20 has a cylindrical wire insertion portion 21 with a hollow portion formed therein for inserting the electric wires 10, and a pair of protruding pieces 22 extending outward from the wire insertion portion 21. As shown in Figure 16, the wire insertion portion 21 has a circular cross-sectional shape, and a slit 23 is formed by cutting a portion of the ring. The wire insertion portion 21 is expanded by increasing the spacing of the slit 23. The slit 23 extends in the axial direction of the wire insertion portion 21 and is formed over the entire length of the wire insertion portion 21. The pair of protruding pieces 22 extend outward from both ends of the slit 23.

[0004] The work of attaching this wire protection tube 20 to the wires 10 is carried out as follows: First, the pair of protruding pieces 22 of the wire protection tube 20 are pulled apart, widening the gap in the slit 23 and expanding the wire insertion section 21. In this expanded state, the wires 10 are passed through the gap in the slit 23, and the wire protection tube 20 is placed over the wires 10.

[0005] Patent Document 1 discloses a device for preventing the electric wire protection tube 20 from falling off from the electric wires 10 by covering the electric wire protection tube 20 with an arc portion and holding a protruding piece in a groove formed in the leg portion, thereby preventing the electric wire protection tube 20 from expanding. This device for preventing the electric wire protection tube 20 from falling off from the electric wires 10 is attached to the electric wire protection tube 20 by a direct attachment method in which the attachment is performed directly by a person wearing high-voltage gloves. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-111258 Summary of the Invention [Problem to be solved by the invention]

[0007] Incidentally, for safety reasons, it is desirable that the work of attaching a fall prevention device such as that described in Patent Document 1 to an electric wire protection pipe 20 be carried out by an indirect method in which the attachment work is performed indirectly by a person using a tool.

[0008] An object of one aspect of the present disclosure is to provide an attachment / detachment tool that can attach and detach a fall-off prevention device to and from an electric wire protection tube using an indirect method. [Means for solving the problem]

[0009] One aspect of the present disclosure is a tool for attaching a fall prevention device to at least one wire protection tube, or for removing the fall prevention device from the wire protection tube. The fall prevention device holds at least one wire protection tube, in an unexpandable state, the at least one wire protection tube having a cylindrical wire insertion portion that is expandable by a slit provided along the axial direction and having protruding pieces extending outward from both ends of the slit. The fall prevention device includes an arc portion, a leg portion, and a hooking piece. The arc portion extends in an arc shape from the first end to the second end and covers the wire insertion portion. The leg portion is connected to the first end and covers the protruding piece. The hooking piece is provided at a predetermined position on the outer circumferential surface of the arc portion and extends radially outward of a circle that is a part of the arc described by the arc portion. The fall prevention device is configured to allow the at least one wire protection tube to be inserted and removed through an opening formed between the second end and the leg portion. The attachment / detachment tool includes a base, a first locking portion, and a second locking portion. The first locking portion is provided on the base and locks the leg portion when the attachment / detachment tool is in a held state in which the fall-prevention device is held by the attachment / detachment tool. The second locking portion is provided on the base and locks the hook piece when the attachment / detachment tool is in a held state in which the fall-prevention device is held by the attachment / detachment tool. In the held state, the fall-prevention device is positioned relative to the attachment / detachment tool so that the opening faces away from the base. The attachment / detachment tool is configured such that the first locking portion and the second locking portion prevent the fall-prevention device from moving in a direction intersecting the axial direction of a ring formed by a circle that is a part of an arc described by the arc portion of the fall-prevention device in the held state.

[0010] In this configuration, the first and second locking portions define the position of the fall prevention device relative to the base of the attachment / detachment tool, and movement of the fall prevention device in a direction intersecting the axial direction is suppressed while the fall prevention device is held in the attachment / detachment tool. This allows the hold state of the fall prevention device in the attachment / detachment tool to be maintained. Therefore, the held fall prevention device can be attached to and detached from at least one wire protection tube by an indirect method using the attachment / detachment tool.

[0011] In one aspect of the present disclosure, the base may be formed with a suppression portion that suppresses axial movement and detachment of the fall prevention device in the held state. In this configuration, the suppression portion suppresses axial movement of the fall prevention device in the held state in which the fall prevention device is held by the attachment / detachment tool. Therefore, even if the attachment / detachment tool is moved in the held state when attaching or detaching the fall prevention device to or from at least one wire protection tube, the fall prevention device is less likely to come off the attachment / detachment tool compared to a configuration in which the attachment / detachment tool does not have a suppression portion.

[0012] In one aspect of the present disclosure, the base may be provided with a pressing portion that is located in a gap formed between the fall prevention device and the base in the held state and abuts against the fall prevention device to press the fall prevention device in a predetermined direction. The pressing portion may be formed of an elastic material. With this configuration, in the held state in which the fall prevention device is held by the attachment / detachment tool, the pressing portion can support the fall prevention device while pressing it in a predetermined direction in the gap formed between the fall prevention device and the base. Therefore, even if the attachment / detachment tool is moved in the held state during the work of attaching or detaching the fall prevention device to or from at least one electric wire protection tube, the fall prevention device is more firmly held by the attachment / detachment tool compared to a configuration in which the attachment / detachment tool does not have a pressing portion, making it less likely for the fall prevention device to come off the attachment / detachment tool. Furthermore, because the pressing portion is formed of an elastic material, the pressing portion deforms when a predetermined force is applied, making it easy to attach and detach the fall prevention device to and from the attachment / detachment tool.

[0013] One aspect of the present disclosure may further include a rotation axis at a predetermined position in a direction toward the second locking portion relative to the position where the first locking portion is provided on the base. The base and a gripping portion held by a user of the attachment / detachment tool, or a connecting portion connecting the gripping portion and the base, may rotate around the rotation axis. In this configuration, the gripping portion or connecting portion and the base are rotatable around the rotation axis. Therefore, by rotating the base relative to the gripping portion or connecting portion around the rotation axis, the legs of the captive device in the held state can be hooked onto the protruding pieces of at least one electric wire protection tube, and then the captive device can be rotated together with the base to be attached to at least one electric wire protection tube. Furthermore, by rotating the captive device in a direction opposite to the operation performed when attaching the captive device, the captive device can be removed from at least one electric wire protection tube. Therefore, the work of attaching and detaching the fall-off prevention device to and from at least one electric wire protection tube, which is performed by changing the angle of the fall-off prevention device relative to at least one electric wire protection tube, can be performed using the attachment and detachment tool.

[0014] One aspect of the present disclosure may further include an adjustment unit that adjusts the slidability of the rotating shaft by changing the frictional force between the connecting portion and the base. With this configuration, the adjustment unit can, for example, increase the frictional force between the connecting portion and the base to tighten the slidability of the rotating shaft, or decrease the frictional force between the connecting portion and the base to loosen the slidability of the rotating shaft. This allows a user of the attachment / detachment tool to freely adjust the frictional force between the connecting portion and the base using the adjustment unit, making it easier to fix the position of the base relative to the connecting portion at any angle. As a result, the attachment / detachment of the fall-off prevention device to the electric wire protection tube can be performed smoothly. Furthermore, even if the shaft member wears out due to repeated use of the attachment / detachment tool and the slidability of the rotating shaft becomes loose, the adjustment unit can again increase the frictional force to restore the slidability of the rotating shaft, thereby enabling long-term use of the attachment / detachment tool.

[0015] In one embodiment of the present disclosure, the at least one electric wire protection tube may be two or more electric wire protection tubes. The fall-off prevention device may be attached to an overlapping portion formed when two or more electric wire protection tubes are connected. With this configuration, for example, at the overlapping portion of the two electric wire protection tubes, the two electric wire protection tubes can be held by a single fall-off prevention device so that they cannot be expanded. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a perspective view of the attachment / detachment tool as seen from the left side. [Figure 2] FIG. 2 is a perspective view of the attachment / detachment tool as seen from the right side. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] 9 is a cross-sectional view taken along line IX-IX in FIG. 8. [Figure 10] FIG. 10 is a diagram showing the state before the protruding piece of the wire protection tube is hooked onto the leg of the fall prevention tool in the holding state in the indirect construction method. [Figure 11] This figure shows the state in which, in the indirect construction method, after the protruding piece is hooked onto the leg portion, the wire insertion portion of the wire protection tube enters into the arc portion through the opening of the fall prevention device, and the attachment / detachment tool is moved so that the wire insertion portion is covered by the arc portion of the fall prevention device. [Figure 12] FIG. 10 is a diagram showing the state in which a fall prevention device is attached to an electric wire protection pipe in an indirect construction method. [Figure 13] 10 is a diagram showing the state before the fall prevention tool, which is held at an angle different from that of the embodiment, is attached to the electric wire protection pipe in the indirect construction method. FIG. [Figure 14]FIG. 10 is a diagram showing a state in which a fall prevention device is attached to an electric wire protection pipe at an angle different from that of the embodiment in an indirect construction method. [Figure 15] FIG. 1 is an external view of a typical electric wire protection pipe. [Figure 16] 16 is a cross-sectional view taken along line XVI-XVI of FIG. 15. [Figure 17] FIG. 10 is an external view of a connectable electric wire protection pipe. [Figure 18] FIG. 10 is an external view showing two electric wire protection pipes connected together. [Figure 19] 19 is a cross-sectional view taken along the line XIX-XIX of FIG. 18. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [1. Configuration] 1 to 6 is a tool for attaching a fall prevention device 40 of this embodiment shown in FIGS. 7 and 8 to a wire protection pipe that protects electric wires installed between utility poles and that holds the wire protection pipe in an unexpandable state, or for removing the fall prevention device 40 from the wire protection pipe. In other words, the attachment and removal tool 60 may be a tool capable of performing either one of the operations of attaching the fall prevention device 40 to the wire protection pipe or removing the fall prevention device 40 from the wire protection pipe, or may be a tool capable of performing both operations. The detailed configurations of the fall prevention device 40 and the attachment and removal tool 60 will be described below.

[0018] The wire protection tube that is the object of retention by the fall-off prevention device 40 of this embodiment has the same structure as the wire protection tube 20 described in the prior art and shown in Figures 15 and 16. That is, the wire protection tube 20 has a cylindrical wire insertion portion 21, a slit 23 that has a length in the axial direction of the wire insertion portion 21, and a pair of protruding pieces 22 that extend outward from both ends of the slit 23. Then, for example, by pulling apart the pair of protruding pieces 22 to widen the gap between the slits 23, the expandable wire protection tube 20 is expanded, allowing the attachment and detachment of the wires 10.

[0019] [1-1. Composition of fall prevention device] 7 and 8 is molded from resin, for example, hard plastic resin. The fall-off prevention device 40 includes an arc portion 41, legs 42, guide pieces 43, and hook pieces 44.

[0020] The arc portion 41 extends in an arc shape from the first end 411 to the second end 412, and is a portion that covers the electric wire insertion portion 21 of the electric wire protection tube 20. Specifically, the arc portion 41 has an arc shape that fits onto the outer peripheral surface of the electric wire insertion portion 21, and the arc length is formed to be longer than half the circumferential length of the outer periphery of the electric wire insertion portion 21.

[0021] The leg portion 42 is connected to the first end 411 of the arc portion 41 and covers the protruding piece 22 of the wire protection tube 20. Specifically, the leg portion 42 extends from the first end 411 of the arc portion 41 and has a first wall portion 51, a second wall portion 52, and a folded portion 53. The first wall portion 51, the second wall portion 52, and the folded portion 53 each have a plate-like shape.

[0022] The first wall portion 51 extends from the first end 411 of the arc portion 41, bending outward from a circle that includes the arc described by the arc portion 41 as a part of the circle. The circle does not need to be a perfect circle, as long as it is approximately circular. For example, it may be a circle that is close to an ellipse. The first end 411 of the arc portion 41 refers to the portion that moves away from the circumference and bends outward from the arc portion 41.

[0023] The second wall portion 52 extends from the tip of the first wall portion 51 by folding back via a folding back portion 53, and is disposed at a position facing the first wall portion 51. The folded portion 53 is a portion that expands in a direction intersecting with the first wall portion 51 , and connects the extending tip of the first wall portion 51 and the second wall portion 52 .

[0024] The tip of such leg portion 42 is folded back into a roughly U-shape, thereby forming groove portion 42a with a width that allows the tip of the two projecting pieces 22 of the electric wire protection tube 20 to be inserted when the two projecting pieces 22 are overlapped. In other words, the portion between the first wall portion 51 and the second wall portion 52 is the above-mentioned groove portion 42a. Here, "inserting" broadly means that the projecting piece 22 is inserted and positioned in the space between the first wall portion 51 and the second wall portion 52. In other words, in the inserted state, there may be a gap between the projecting piece 22 and the first wall portion 51 and the second wall portion 52, or the projecting piece 22 may abut against the first wall portion 51 and the second wall portion 52. Furthermore, the tip of the projecting piece 22 may or may not abut against the folded back portion 53.

[0025] The distance between the first wall portion 51 and the second wall portion 52 gradually narrows toward the tip of the first wall portion 51. The tip here refers to the tip in the extension direction, that is, the direction in which the first wall portion 51 extends from the arc portion 41, and is the position on the leg portion 42 farthest from the arc portion 41. In other words, the tip of the leg portion 42 away from the arc portion 41 is tapered.

[0026] The guide piece 43 extends from the second end 412 opposite the first end 411 on the side where the leg 42 of the arc portion 41 extends, i.e., from the tip of the arc portion 41, in the outward direction of a circle that is part of the arc described by the arc portion 41.

[0027] The hook piece 44 is provided at a predetermined position on the outer peripheral surface of the arc portion 41, for example, at the circumferential midpoint, and extends from the circumferential midpoint radially outward of a circle that is part of the arc described by the arc portion 41.

[0028] The arc portion 41 has the largest thickness D1 at the center in the axial direction shown in Figure 9, and the smallest thickness D2 at both ends in the axial direction. The axial direction here refers to the axial direction of an imaginary ring of which the arc portion 41 is a part. The axial direction can also be said to be the axial direction of the wire protection tube 20 when the fall-off prevention device 40 is attached to the wire protection tube 20. The center portion here refers to a portion that includes a position that is central in the left-right direction.

[0029] The thickness of each of the first wall portion 51, the second wall portion 52, and the folded portion 53 is D2. That is, the thickness of the arc portion 41 is greater overall than the thickness of the leg portion 42 (the first wall portion 51, the second wall portion 52, and the folded portion 53), and is the same thickness as those only at both end portions. The thickness here refers to the thickness when the fall-off prevention device 40 is projected onto a plane whose normal direction is the axial direction described above, that is, the thickness from the perspective of FIG. 8. The thickness of the arc portion 41 refers to the thickness in the direction in which the arc portion 41 and the electric wire insertion portion 21 overlap (the radial direction of a circle of which the arc is a part).

[0030] An opening 45 is formed between the second end 412 of the arc portion 41 and an unconnected end 521 on the opposite side of the end of the leg portion 42 that communicates with the first end 411 of the arc portion 41. Specifically, the opening 45 is formed between the second end 412 of the arc portion 41 and the end of the unconnected end 521 of the second wall portion 52 of the leg portion 42. In other words, the opening 45 is a portion formed by opening a part of the side wall of the substantially cylindrical body formed by the arc portion 41 and the leg portion 42. The fall-off prevention device 40 is configured so that the wire protection tube 20 can be inserted and removed through the opening 45.

[0031] [1-2. Configuration of attachment / detachment tools] 1 to 6 is used to attach and detach the above-mentioned fall-off prevention device 40 to and from the wire protection tube 20 by an indirect method in which a person uses a tool to indirectly perform the attachment and detachment work. The attachment and detachment tool 60 is molded from resin, for example, hard plastic resin. The attachment and detachment tool 60 includes a main body 61, a socket 62, a shaft member 63, and an adjustment part 64.

[0032] The main body portion 61 is a portion into which the above-mentioned fall-off prevention device 40 is fitted and locked in a holding state (see FIG. 10 ) in which the above-mentioned fall-off prevention device 40 is held by the attachment / detachment tool 60. Note that, as will be described in detail later, the fall-off prevention device 40 is attached to or detached from the main body portion 61 by sliding along the axial direction of the fall-off prevention device 40 relative to the main body portion 61. The main body portion 61 has a base portion 71, a first locking portion 72, a second locking portion 73, a first suppressing portion 74a, a second suppressing portion 74b, a first pressing portion 75a, a second pressing portion 75b, and a connecting portion 76.

[0033] The base 71 is a plate-like member that extends in a curved manner from a first end 711 to a second end 712. In the held state described above, the capsulation device 40 is disposed relative to the main body 61 so that the opening 45 of the capsulation device 40 faces away from the base 71. The first end 711 of the base 71 is connected to a first locking portion 72 (described later), and the second end 712 of the base 71 is connected to a connecting portion 76 (described later). The axial direction of the capsulation device 40 described above is the axial direction of a ring formed by a circle of which the arc described by the arc portion 41 is a part, and is perpendicular to the radial direction of the arc portion 41. When the capsulation device 40 is in a held state held by the attachment / detachment tool 60, this axial direction is the same as the axial direction of an imaginary ring of which the curved base 71 is a part. The axial direction can also be said to be the left-right direction from the right side surface 71a, which is a side surface along the curve of the base 71, to the left side surface 71b, or from the left side surface 71b to the right side surface 71a.

[0034] The first locking portion 72 is provided on the first end 711 side of the base 71 and is a portion that locks onto the leg portion 42 of the fall-off prevention device 40 in the held state. Specifically, the first locking portion 72 extends from the first end 711 of the base 71 in a manner that folds back inward of an imaginary circle of which the curved base 71 forms a part, and has a first wall portion 721 and a folded portion 722. The first wall portion 721 and the folded portion 722 each have a plate-like shape. The first wall portion 721 extends from the first end 711 of the base 71 by folding back via the folded portion 722. The first wall portion 721 faces the wall portion on the first end 711 side of the base 71. The folded portion 722 is a portion that expands in a direction intersecting with the wall portion on the first end portion 711 side of the base portion 71, and connects the first end portion 711 of the base portion 71 and the first wall portion 721.

[0035] In this way, by providing the first locking portion 72 at the first end 711 of the base 71 and folding one end of the main body 61 back into a U-shape, a groove 72a is formed with a width that allows the leg portion 42 of the fall-off prevention device 40 to be inserted. In other words, the groove 72a is the portion between the wall portion on the first end 711 side of the base 71 and the first wall portion 721. In this embodiment, as shown in Fig. 10 , in the held state, the leg portion 42 is inserted into the groove 72a so that at least the second wall portion 52 of the leg portion 42 abuts against the first wall portion 721 of the first locking portion 72.

[0036] The second locking portion 73 is provided on the second end 712 side of the base 71 and is a portion that locks the hook piece 44 of the fall-off prevention device 40 in the held state. Specifically, the second locking portion 73 is provided slightly closer to the center of the base 71 than the second end 712. The second locking portion 73 protrudes from the inner circumferential surface of the base 71 and has a plate-like shape that is long in the axial direction, i.e., the left-right direction. The inner circumferential surface of the base 71 here refers to the surface of the base 71 that faces the fall-off prevention device 40 in the held state. Note that a guide piece 731 extending toward the second end 712 of the base 71 may be provided at the end of the second locking portion 73 on the right side surface 71a side of the base 71. In this embodiment, as shown in FIG. 10 , the hook piece 44 abuts against the second locking portion 73 in the held state. Specifically, the hook piece 44 comes into contact with the surface of the second locking portion 73 facing the first end portion 711 of the base portion 71.

[0037] As described above, in the held state, the second wall portion 52 of the leg portion 42 abuts against the first wall portion 721 of the first locking portion 72, and the hook piece 44 abuts against the second locking portion 73, thereby suppressing movement of the fall-off prevention device 40 in a direction intersecting the axial direction. In other words, the held state of the fall-off prevention device 40 in the attachment / detachment tool 60 is maintained, and, for example, the held state of the fall-off prevention device 40 is suppressed from moving in the axial direction and falling off.

[0038] The first suppression portion 74a is formed on the left side surface 71b of the base 71. The first suppression portion 74a is located near the first locking portion 72. The first suppression portion 74a protrudes from the inner circumferential surface of the base 71 along the left side surface 71b of the base 71. Specifically, the first suppression portion 74a is a wall portion that has a substantially triangular shape when viewed from the left side surface 71b of the base 71.

[0039] Similar to the first suppression portion 74a, the second suppression portion 74b is formed on the left side surface 71b of the base 71. The second suppression portion 74b is located near the second locking portion 73. The second suppression portion 74b protrudes from the inner circumferential surface of the base 71 along the left side surface 71b of the base 71 and has a plate-like shape having a length along the curvature direction of the base 71. Specifically, the second suppression portion 74b is a wall portion that intersects with the end of the second locking portion 73 on the left side surface 71b side of the base 71 and extends toward the center of the base 71.

[0040] The first and second suppression parts 74a and 74b described above restrict movement of the fall-off prevention device 40 toward the left side surface 71b in the axial direction, i.e., toward the left. This prevents the fall-off prevention device 40 from moving toward the left side surface 71b in the axial direction, i.e., toward the left, and falling off.

[0041] The first pressing portion 75a and the second pressing portion 75b are members that are located in a gap formed between the fall-off prevention device 40 and the base 71 in the held state and come into contact with the fall-off prevention device 40 to press the fall-off prevention device 40. The first pressing portion 75a and the second pressing portion 75b are formed of an elastic member. In this embodiment, the first pressing portion 75a and the second pressing portion 75b are round rubber cords having a round cross-sectional shape, and are provided in a loop shape that protrudes in an arc from the inner circumferential surface of the base 71 by fixing both ends of the round rubber cord to two holes that are arranged side by side in the curved direction of the base 71. The first pressing portion 75a and the second pressing portion 75b are arranged side by side on the right side surface 71a of the base 71, along the curved direction of the base 71, between the first locking portion 72 and the second locking portion 73. The first pressing portion 75a is located near the first locking portion 72, and the second pressing portion 75b is located near the second locking portion 73. As shown in FIG. 10 , in the held state, the first pressing portion 75a abuts against the leg portion 42 of the fall-off prevention device 40, and the second pressing portion 75b abuts against the arc portion 41 of the fall-off prevention device 40.

[0042] 4, in this embodiment, the second pressing portion 75b has a higher loop height than the first pressing portion 75a. Specifically, the distance T1 from the inner circumferential surface of the base 71 of the first pressing portion 75a to the apex of the loop is approximately 22 mm, and the distance T2 from the inner circumferential surface of the base 71 of the second pressing portion 75b to the apex of the loop is approximately 27 mm.

[0043] When the capsulation device 40 is attached to the attachment / detachment tool 60, the above-described first pressing portion 75a and second pressing portion 75b elastically deform so as to bend toward the left side surface 71b of the base 71 in the axial direction and come into contact with the capsulation device 40. At this time, the capsulation device 40 is pressed by the pressure of the first pressing portion 75a and the second pressing portion 75b, and the first pressing portion 75a and the second pressing portion 75b come into contact with the capsulation device 40. This generates friction between the first pressing portion 75a and the second pressing portion 75b and the capsulation device 40, making it difficult for the capsulation device 40 to move toward the right side surface 71a in the axial direction, i.e., to the right. This prevents the capsulation device 40 from moving toward the right side surface 71a in the axial direction, i.e., to the right, and falling off.

[0044] The connecting portion 76 is a plate-like portion that extends from the second end 712 of the base portion 71 so as to fold back toward the outside of an imaginary circle that forms a part of the curved base portion 71. The connecting portion 76 has a through-hole 761 that penetrates in the axial direction, i.e., the left-right direction, as shown in Figures 5 and 6.

[0045] The socket portion 62 is a rod-shaped member made of, for example, an aluminum alloy. The socket portion 62 has a first connecting groove 621 at one end into which the connecting portion 76 can be inserted. Two opposing wall portions 622 constituting the first connecting groove 621 are provided with through holes 623 (shown in FIGS. 5 and 6 ) that overlap with the through holes 761 of the connecting portion 76. The socket portion 62 has a second connecting groove 624 at the end opposite to the side where the connecting portion 76 is connected. The second connecting groove 624 is a groove that can be connected to a gripping portion such as a rod-shaped member (not shown) that is held by a user of the attachment / detachment tool 60 to attach / detach the retained fall-off prevention device 40 to / from the wire protection tube 20. In this embodiment, the socket portion 62 functions as a connecting portion that connects the main body portion 61 and a gripping portion held by a user of the attachment / detachment tool 60 via the connecting portion 76. The two wall portions 622 are each provided with a recessed portion 626 around the through hole 623, the recessed portion 626 having a flat surface 625 that faces an adjustment portion 64 and an axial member 63, which will be described later. The recessed portion 626 has a shape in which a part of the two wall portions 622 around the through hole 623 is recessed inward.

[0046] The shaft member 63 is a member having a rod-shaped portion for fixing the connection between the main body portion 61 and the socket portion 62 via the connecting portion 76. The shaft member 63 has a head portion 631 and a rod portion 632. The shaft member 63 is, for example, a hexagon bolt. When the through-hole 761 of the connecting portion 76 of the main body portion 61 and the through-hole 623 of the socket portion 62 are aligned with each other, the rod portion 632 of the shaft member 63 passes through all of the through-holes 761 of the connecting portion 76 and the through-holes 623 of the socket portion 62. At this time, the head portion 631 abuts against a flat surface 625 of the recessed portion 626 of the wall portion 622. The position of the shaft member 63 within the through-holes 761, 623 may be fixed by an adjustment portion 64 (described later) fixed to the shaft member 63. This allows the main body portion 61 to be rotatably attached to the socket portion 62 around the central axis of the shaft member 63 as a rotation axis.

[0047] The adjustment part 64 is a member that adjusts the sliding properties of the rotation shaft by changing the frictional force between the socket part 62 and the connecting part 76 extending from the base part 71, which is related to rotation about the shaft member 63 serving as the rotation shaft. The frictional force between the socket part 62 and the connecting part 76 refers to the frictional force that occurs when they rotate or attempt to rotate relative to each other. The adjustment part 64 is, for example, a U-nut. The adjustment part 64 is attached to the end of the rod part 632, which is inserted into the through-holes 761 and 623, opposite the head part 631, and abuts against the flat surface 625 of the recessed part 626 of the wall part 622. By fastening the adjustment part 64 to the rod part 632 of the shaft member 63, the connection between the main body part 61 and the socket part 62 via the connecting part 76 is fixed. The configuration of the shaft member 63 and the adjustment unit 64 is not limited to this, and the shaft member and the adjustment unit may be configured, for example, by a shaft member having a male thread on its outer surface and nuts fastened from both ends of the shaft member.

[0048] By moving the position of the adjustment unit 64 along the central axis direction of the shaft member 63 so as to approach the head 631 of the shaft member 63, and by sandwiching the adjustment unit 64 and the head 631, the coupling portion 76 is tightly fastened by the two wall portions 622 of the socket portion 62, thereby increasing the resistance of the rotating shaft. In other words, by increasing the frictional force between the socket portion 62 and the coupling portion 76 using the adjustment unit 64, the sliding properties of the rotating shaft can be made firmer. Furthermore, by moving the position of the adjustment unit 64 along the central axis direction of the shaft member 63 so as to move away from the head 631 of the shaft member 63, the sliding properties of the coupling portion 76 by the two wall portions 622 of the socket portion 62 can be made weaker, thereby reducing the resistance of the rotating shaft. In other words, by reducing the frictional force between the socket portion 62 and the coupling portion 76 using the adjustment unit 64, the sliding properties of the rotating shaft can be made looser.

[0049] [2. How to attach fall prevention devices to electric wire protection pipes in indirect installation methods using attachment / detachment tools] [2-1. Attaching the fall prevention device to the attachment / detachment tool] First, the stopper 40 is brought to the right side surface 71 a of the base 71 of the main body 61 with the opening 45 of the stopper 40 facing away from the base 71 of the main body 61 of the attachment / detachment tool 60 .

[0050] Next, the hook piece 44 of the anti-slip device 40 is placed between the first locking portion 72 and the second locking portion 73 of the attachment / detachment tool 60, and the leg portion 42 of the anti-slip device 40 is inserted into the groove portion 72a between the base portion 71 of the attachment / detachment tool 60 and the first wall portion 721 of the first locking portion 72, thereby attaching the anti-slip device 40 to the main body portion 61.

[0051] An example of how to attach the fall-prevention device 40 to the main body 61 is shown below. For example, the hook piece 44 of the fall-prevention device 40 is brought into contact with the second locking portion 73 of the main body 61, and the second wall portion 52 of the leg portion 42 of the fall-prevention device 40 is brought into contact with the first wall portion 721 of the first locking portion 72 of the main body 61, thereby determining the position at which the fall-prevention device 40 is fitted into the main body 61. At this time, if the hook piece 44 is slid along the guide piece 731 of the second locking portion 73, it is easy to bring the hook piece 44 into contact with the second locking portion 73 in the correct position.

[0052] Then, while maintaining the determined fitting position of the fall-off prevention device 40 relative to the main body 61, the fall-off prevention device 40 is slid in the axial direction, i.e., leftward, to a position where it abuts against the first suppression portion 74a and the second suppression portion 74b of the main body 61. At this time, as the fall-off prevention device 40 slides, the first pressing portion 75a and the second pressing portion 75b of the main body 61 elastically deform so as to bend in the axial direction toward the left side surface 71b of the base 71, and a pressing force is applied to the fall-off prevention device 40.

[0053] 10 , when the fall-prevention device 40 is attached to the main body 61, the leg 42 of the fall-prevention device 40 is fitted into the groove 72a between the base 71 of the attachment / detachment tool 60 and the first wall 721 of the first locking portion 72, so that the leg 42 is locked by the first locking portion 72, and the hook piece 44 is locked by the second locking portion 73. Then, the first suppressing portion 74a and the second suppressing portion 74b of the main body 61 restrict leftward movement of the fall-prevention device 40, and the pressing force of the first pressing portion 75a and the second pressing portion 75b of the main body 61 restricts rightward movement of the fall-prevention device 40.

[0054] As described above, by fitting the fall-off prevention device 40 into the main body 61, the held state shown in FIG. 10 in which the fall-off prevention device 40 is held by the attachment / detachment tool 60 is maintained.

[0055] [2-2. Attaching the retaining device to the electric wire protection pipe] 10 , first, the attachment / detachment tool 60 is placed below the wire protection tube 20 so that the opening 45 of the captive device 40 in the held state faces the protruding piece 22 of the wire protection tube 20 that is placed over the wire 10. For example, although not shown in the figures, the captive device 40 in the held state can be placed below the wire protection tube 20, which is located at a high position, by a person grasping a rod-shaped member or the like having a length that is connected to the second connecting groove 624 of the socket part 62. Note that the operation of the socket part 62, which will be described below, is performed by a person manipulating the rod-shaped member connected to the socket part 62.

[0056] Next, the socket portion 62 of the attachment / detachment tool 60 is lifted upward, and the protruding piece 22 is inserted into the groove portion 42 a of the fall-off prevention device 40 through the opening portion 45 . Then, after the protruding piece 22 is inserted into the groove 42a, the socket portion 62 of the attachment / detachment tool 60 is pushed upward. As a result, the main body portion 61 rotates relative to the socket portion 62 about the shaft member 63, which serves as the rotation axis, so that the second end 712 of the base portion 71 of the main body portion 61 of the attachment / detachment tool 60 moves toward the upper side of the wire protection tube 20. Specifically, by pushing the socket portion 62 upward, the main body portion 61 rotates in the Y direction indicated by the arrow in FIG. 11, and the socket portion 62 rotates in the X direction indicated by the arrow in FIG. 11, with the shaft member 63 as the rotation axis.

[0057] By rotating the main body 61 relative to the socket 62 in this manner, the grooves 42a of the fall prevention device 40 are hooked onto the tips of the two overlapping protruding pieces 22 of the electric wire protection tube 20, as shown in Figure 11.

[0058] Then, after the groove 42a is hooked onto the tip of the protruding piece 22, the socket part 62 of the attachment / detachment tool 60 is pushed further upward. As a result, the main body part 61 of the attachment / detachment tool 60 further rotates about the shaft member 63 relative to the socket part 62 so that the second end 712 of the base part 71 of the main body part 61 moves directly above the wire protection tube 20. Specifically, by pushing the socket part 62 further upward, the main body part 61 further rotates in the Y direction and the socket part 62 further rotates in the X direction about the shaft member 63.

[0059] In this way, by further moving the attachment / detachment tool 60 so that the main body 61 rotates relative to the socket 62, the base 71 pushes the arc portion 41 in the direction of pressing the tip of the arc portion 41 against the wire insertion portion 21, i.e., in the Y direction, around the groove 42a of the anti-fall-off device 40.

[0060] Here, the guide piece 43 extending from the tip of the arc portion 41 is pressed against the outer peripheral surface of the wire insertion portion 21, thereby sliding along the outer peripheral surface and moving in a direction away from the side from which the protruding piece 22 of the wire insertion portion 21 extends. At that time, the arc portion 41 is elastically deformed so as to be pushed open.

[0061] Then, the tip of the arc portion 41 climbs over the part of the wire insertion portion 21 opposite the side from which the protruding piece 22 extends, and as a result, the wire insertion portion 21 of the wire protection tube 20 enters the arc portion 41 through the opening 45 of the fall-off prevention device 40, and the arc portion 41 covers the wire insertion portion 21, as shown in Figure 12. In other words, the fall-off prevention device 40 is attached to the outer periphery of the wire protection tube 20 with the arc portion 41 fitted onto the outer periphery of the wire insertion portion 21.

[0062] When the fall-off prevention device 40 is attached to the outer periphery of the wire protection tube 20 in this manner, the arc portion 41 extends from the end of the leg portion 42 opposite the groove portion 42a along the outer periphery of the wire insertion portion 21, and fits over a portion longer than half the circumferential length of the outer periphery of the wire insertion portion 21. The protruding piece 22 is inserted into the groove portion 42a. Note that when the fall-off prevention device 40 is attached to the wire protection tube 20, the second wall portion 52 extends from the folded portion 53 so that the further it is from the folded portion 53, the further it is from the protruding piece 22.

[0063] [2-3. Removing the attachment / detachment tool from the fall prevention device] In this embodiment, as shown in FIG. 12, after the fall prevention device 40 is attached to the electric wire protection tube 20, the fall prevention device 40 is removed from the attachment / detachment tool 60 by moving the attachment / detachment tool 60 to release the holding state.

[0064] An example of how to remove the main body 61 from the fall-off prevention device 40 using the attachment / detachment tool 60 is shown below. For example, the fall-off prevention device 40 can be removed from the attachment / detachment tool 60 by moving the attachment / detachment tool 60 so that the fall-off prevention device 40 slides in the opposite direction to when the fall-off prevention device 40 was fitted into the main body 61 as described above.

[0065] Specifically, the attachment / detachment tool 60 is slid leftward along the axial direction relative to the fall-off prevention device 40 in the held state, and the attachment / detachment tool 60 is removed from the fall-off prevention device 40 .

[0066] [3. How to remove fall prevention devices attached to electric wire protection pipes in indirect installation methods using attachment / detachment tools] The attachment / detachment tool 60 of this embodiment can also be used to remove the fall-off prevention device 40 that has been attached to the wire protection tube 20 as described above from the wire protection tube 20. Removal of the fall-off prevention device 40 from the wire protection tube 20 is achieved by performing the operations in the reverse direction to those performed when attaching the fall-off prevention device 40 described above.

[0067] 12 in which the outer peripheral surface of the base 71 of the main body 61 and the socket 62 are close to each other, is brought close to the captive device 40 that is attached to the wire protection tube 20. Then, the captive device 40 is positioned on the right side surface 71a of the base 71 of the main body 61 with the base 71 of the main body 61 of the captive device 40 facing away from the opening 45 of the captive device 40.

[0068] Next, the hook pieces 44 of the captive device 40 are placed between the first locking portion 72 and the second locking portion 73 of the attachment / detachment tool 60, and the legs 42 of the captive device 40 are inserted into the grooves 72a between the base 71 of the attachment / detachment tool 60 and the first wall portion 721 of the first locking portion 72, thereby attaching the main body 61 to the captive device 40. As a result, the captive device 40, which is attached to the wire protection tube 20, is held by the attachment / detachment tool 60 as shown in FIG.

[0069] Next, the socket portion 62 of the attachment / detachment tool 60 is pulled downward. As a result, as shown in Fig. 11 , the main body portion 61 rotates around the shaft member 63, which serves as the rotation axis, relative to the socket portion 62, so that the second end 712 of the base portion 71 of the main body portion 61 of the attachment / detachment tool 60 moves to the lower side of the wire protection tube 20. Specifically, by pulling the socket portion 62 downward, the main body portion 61 rotates around the shaft member 63 as the rotation axis in the direction opposite to the Y direction indicated by the arrow in Fig. 11, and the socket portion 62 rotates in the direction opposite to the X direction indicated by the arrow in Fig. 11.

[0070] In this way, by rotating the main body 61 relative to the socket 62, the base 71 pulls the arc portion 41 around the groove 42a of the fall-off prevention device 40 in a direction that pulls the arc portion 41 away from the wire insertion portion 21. At that time, the arc portion 41 elastically deforms as if being pushed apart, and as shown in Figure 11, the wire insertion portion 21 of the wire protection tube 20 comes out of the arc portion 41 through the opening 45 of the fall-off prevention device 40, and the state in which the arc portion 41 is fitted around the outer peripheral surface of the wire insertion portion 21 is released.

[0071] Thereafter, the socket portion 62 of the attachment / detachment tool 60 is pulled further downward. As a result, as shown in Fig. 10 , the main body portion 61 rotates about the shaft member 63, which serves as the rotation axis, relative to the socket portion 62 so that the second end portion 712 of the base portion 71 of the main body portion 61 of the attachment / detachment tool 60 moves to the lower side of the protruding piece 22 of the wire protection tube 20. Specifically, by pulling the socket portion 62 downward, the main body portion 61 further rotates about the shaft member 63 in the direction opposite to the Y direction, and the socket portion 62 further rotates in the direction opposite to the X direction.

[0072] In this way, the attachment / detachment tool 60 is further moved so that the main body 61 rotates relative to the socket 62, removing the protruding piece 22 of the wire protection tube 20 from the groove 42a of the captive device 40 and releasing the tip of the protruding piece 22 from the groove 42a of the captive device 40. As a result, the captive device 40 attached to the wire protection tube 20 is removed by the attachment / detachment tool 60, as shown in Figure 10. After that, the captive device 40 is removed from the attachment / detachment tool 60 to release the held state.

[0073] [4. Effects] According to the embodiment described above in detail, the following effects can be obtained. (4a) In this embodiment, the position of the main body 61 of the attachment / detachment tool 60 for the captive device 40 relative to the base 71 is determined by the first locking portion 72 provided at the first end 711 of the base 71 and the second locking portion 73 provided at the second end 712 of the base 71. In the held state, the second wall portion 52 of the leg portion 42 abuts against the first wall portion 721 of the first locking portion 72, and the hook piece 44 abuts against the second locking portion 73, thereby suppressing movement of the captive device 40 in a direction intersecting the axial direction. This makes it possible to maintain the held state of the captive device 40 in the attachment / detachment tool 60. Therefore, the captive device 40 in the held state can be attached to and detached from the wire protection tube 20 by an indirect method using the attachment / detachment tool 60.

[0074] (4b) In the present embodiment, the position of the fall-off prevention device 40 to the left in the axial direction is determined by the first restraining portion 74a provided near the first end 711 of the base 71 and the second restraining portion 74b provided near the second end 712 of the base 71 on the left side surface 71b of the base 71. In the held state, the fall-off prevention device 40 abuts against the first restraining portion 74a and the second restraining portion 74b, thereby restraining the fall-off prevention device 40 from moving to the left in the axial direction. For this reason, even if the attachment / detachment tool 60 is moved during the work of attaching or detaching the fall-off prevention device 40 to or from the wire protection pipe 20 in the held state, the fall-off prevention device 40 is less likely to come off the attachment / detachment tool 60 compared to a configuration in which the attachment / detachment tool 60 does not have the first restraining portion 74a and the second restraining portion 74b.

[0075] (4c) In this embodiment, in the held state, the first pressing portion 75a and the second pressing portion 75b are located in the gap formed between the fall-off prevention device 40 and the base portion 71. This allows the first pressing portion 75a and the second pressing portion 75b to support the fall-off prevention device 40 while pressing it in a predetermined direction, specifically, toward the opening 45 of the arc portion 41. In other words, the first pressing portion 75a and the second pressing portion 75b can support the fall-off prevention device 40 while strengthening the engagement of the leg portion 42 by the first locking portion 72 and the engagement of the hook piece 44 by the second locking portion 73. For this reason, even if the attachment / detachment tool 60 is moved when attaching or detaching the fall prevention device 40 to or from the wire protection tube 20 in the held state, the fall prevention device 40 is held more firmly by the attachment / detachment tool 60, making it less likely for the fall prevention device 40 to come off the attachment / detachment tool 60, compared to a configuration in which the attachment / detachment tool 60 does not have the first pressing portion 75a and the second pressing portion 75b. Furthermore, because the first pressing portion 75a and the second pressing portion 75b are formed from an elastic member, the first pressing portion 75a and the second pressing portion 75b deform when a predetermined force is applied, making it easy to attach and detach the fall prevention device 40 to and from the attachment / detachment tool 60.

[0076] (4d) In this embodiment, the base 71 rotates around the shaft member 63, which serves as the rotation axis, relative to the socket 62. Therefore, by rotating the base 71 relative to the socket 62 around the shaft member 63, the legs 42 of the captive device 40 in the held state can be hooked onto the protruding pieces 22 of the wire protection tube 20, and then the captive device 40 can be rotated together with the base 71 to attach it to the wire protection tube 20. Furthermore, by rotating the captive device 40 in the opposite direction to the operation performed when attaching it, the captive device 40 can be removed from at least one wire protection tube 20. Therefore, the attachment and detachment tool 60 can be used to attach and detach the captive device 40 to and from the wire protection tube 20, which requires changing the angle of the captive device 40 relative to the wire protection tube 20.

[0077] (4e) In this embodiment, the adjustment unit 64 fixed to the shaft member 63 constituting the rotating shaft can adjust the slidability of the rotating shaft by changing the frictional force between the socket portion 62 and the connecting portion 76. The adjustment unit 64 can increase the frictional force between the socket portion 62 and the connecting portion 76 to make the slidability of the rotating shaft firmer, or decrease the frictional force between the socket portion 62 and the connecting portion 76 to make the slidability of the rotating shaft looser. Specifically, by increasing the clamping force between the adjustment unit 64 and the head portion 631, the clamping force of the connecting portion 76 by the two wall portions 622 of the socket portion 62 can be increased, thereby increasing the sense of resistance of the rotating shaft. Furthermore, by decreasing the clamping force between the adjustment unit 64 and the head portion 631, the clamping force of the connecting portion 76 by the two wall portions 622 of the socket portion 62 can be decreased, thereby decreasing the sense of resistance of the rotating shaft. This allows the user of the attachment / detachment tool 60 to use the adjustment unit 64 to adjust the frictional force between the socket portion 62 and the connecting portion 76 as desired, making it easier to fix the position of the base portion 71 relative to the socket portion 62 at any angle. As a result, the attachment / detachment work of the fall-off prevention device 40 can be smoothly carried out to / from the wire protection tube 20. Furthermore, even if the shaft member 63 or the through hole 623 wears down due to repeated use of the attachment / detachment tool 60 and the sliding stiffness of the rotating shaft becomes loose, the sliding stiffness of the rotating shaft can be restored by increasing the frictional force using the adjustment unit 64, allowing the attachment / detachment tool 60 to be used for a long period of time.

[0078] In this embodiment, the socket portion 62 corresponds to the connecting portion, the rod-shaped member connected to the socket portion 62 corresponds to the gripping portion, the shaft member 63 corresponds to the rotating shaft, the first suppression portion 74a and the second suppression portion 74b correspond to the suppression portion, and the first pressing portion 75a and the second pressing portion 75b correspond to the pressing portion.

[0079] 5. Other Embodiments Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure is not limited to the above-described embodiments and can take on various forms.

[0080] (5a) In the above embodiment, a configuration in which the first suppression portion 74a and the second suppression portion 74b are formed on the left side surface 71b of the base 71 is exemplified, but the configuration of the base is not limited to this. The position at which the suppression portion capable of suppressing axial movement of the fall-off prevention device 40 is provided is not limited, and for example, the suppression portion may be provided on the right side surface 71a of the base 71. Furthermore, the number of suppression portions provided is not limited, and for example, one or three or more suppression portions may be provided. Furthermore, for example, the suppression portion may not be formed on the base.

[0081] (5b) In the above embodiment, the first pressing portion 75a and the second pressing portion 75b are formed on the right side surface 71a of the base 71 and are arranged side by side along the curved direction of the base 71. However, the configuration of the base is not limited to this. The position at which the pressing portion that presses the fall-off prevention device 40 is provided is not limited. For example, the pressing portion may be provided on the left side surface 71b of the base 71 or in the center of the base 71. The number of pressing portions is not limited. For example, one pressing portion or three or more pressing portions may be provided. The arrangement of the pressing portions is not limited. For example, the pressing portions may be arranged side by side along the axial direction of the base 71 or arranged diagonally along the curved direction of the base 71. For example, the pressing portion does not need to be formed on the base. For example, the pressing portion may be a flat rubber band with a flat cross section. The pressing portion may also be an elastically deformable plate-shaped, convex, or spring-shaped member.

[0082] (5c) In the above embodiment, the attachment / detachment tool 60 has a rotation axis, and the socket portion 62 rotates relative to the base portion 71 around the shaft member 63 as the rotation axis. However, the configuration of the attachment / detachment tool is not limited to this. For example, the attachment / detachment tool may have a configuration that does not have a rotation axis. For example, the attachment / detachment tool may have a configuration in which the main body portion and the socket portion are connected by a bendable elastic member, and the main body portion or the socket portion itself is bendable by the elastic member.

[0083] (5d) The configuration and shape of the attachment / detachment tool for holding a fall prevention device are not limited to those of the attachment / detachment tool 60 of this embodiment. In other words, components other than those that hold the fall prevention device and enable attachment to the wire protection tube 20 in the held state may or may not be included in the attachment / detachment tool. For example, the part that serves as the rotation axis does not have to be a separate component like the shaft member 63, but may be configured to be rotatable by fitting the socket portion or main portion to a protrusion formed integrally with the main portion or socket portion. Also, for example, in a configuration that does not have the socket portion 62, a grip portion that can be held and operated by a person may be rotatably attached directly to the main portion. Also, in a configuration that does not have the connecting portion 76, the socket portion or grip portion may be directly connected to the base.

[0084] Furthermore, the shape of the configuration other than that which holds the fall-off prevention device and functions to allow attachment to the wire protection tube 20 in the held state can take various forms. For example, the base is not limited to a curved plate shape, but may be a square with one side open, an L-shape, or a flat plate shape. Also, for example, the socket portion is not limited to a rod-shaped member, but may be a cylindrical or plate-shaped member. Also, for example, the second locking portion is not limited to a plate shape that abuts against the hooking piece 44 of the fall-off prevention device 40, but may be a groove into which the hooking piece 44 of the fall-off prevention device 40 can be inserted, or may be configured to grip the hooking piece 44 by elastic force or the like. Also, the detailed shape of the fall-off prevention device held by the attachment / detachment tool is not limited to the shape of the fall-off prevention device 40 of this embodiment.

[0085] (5e) In the above embodiment, the method of attaching the fall prevention device 40 to the wire protection tube 20 in the indirect method using the attachment / detachment tool 60 is exemplified by attaching the fall prevention device 40 from below to the wire protection tube 20 that is attached to the wire 10 so that the protruding pieces 22 face downward, using the attachment / detachment tool 60. However, the method of attaching the fall prevention device 40 to the wire protection tube 20 is not limited to this. For example, as shown in Figures 13 and 14 , it is also possible to use the attachment / detachment tool 60 of this embodiment to attach the fall prevention device 40 from an angle different from that of the above embodiment to the wire protection tube 20 that is attached to the wire 10 in the reverse direction so that the protruding pieces 22 face upward.

[0086] 13 , first, the attachment / detachment tool 60 is placed above the wire protection tube 20 so that the opening 45 of the captive device 40 in the held state faces the protruding piece 22 of the wire protection tube 20 that is placed over the wire 10. Next, the socket portion 62 of the attachment / detachment tool 60 is pulled downward, and the protruding piece 22 is inserted into the groove portion 42a of the captive device 40 via the opening 45.

[0087] Then, after the protruding piece 22 is inserted into the groove 42a, the socket portion 62 of the attachment / detachment tool 60 is pulled downward. As a result, the main body portion 61 rotates around the shaft member 63, which serves as the rotation axis, relative to the socket portion 62, so that the second end 712 of the base portion 71 of the main body portion 61 of the attachment / detachment tool 60 moves to the lower side of the wire protection tube 20. Specifically, by pulling the socket portion 62 downward, the main body portion 61 rotates in the Y2 direction indicated by the arrow in FIG. 14, and the socket portion 62 rotates in the X2 direction indicated by the arrow in FIG. 14, with the shaft member 63 as the rotation axis.

[0088] By rotating the main body 61 relative to the socket 62 in this manner, the grooves 42 a of the fall-off prevention device 40 are hooked onto the tips of the two overlapping protruding pieces 22 of the electric wire protection tube 20 .

[0089] Then, after the groove 42a is hooked onto the tip of the protruding piece 22, the socket part 62 of the attachment / detachment tool 60 is pushed further downward. As a result, the main body part 61 of the attachment / detachment tool 60 further rotates around the shaft member 63 relative to the socket part 62 so that the second end part 712 of the base part 71 of the main body part 61 of the attachment / detachment tool 60 moves directly below the wire protection tube 20.

[0090] In this way, by further moving the attachment / detachment tool 60 so that the main body 61 rotates relative to the socket 62, the wire insertion portion 21 of the wire protection tube 20 enters the arc portion 41 of the fall-off prevention device 40, and the arc portion 41 covers the wire insertion portion 21, just as in the attachment method of the present embodiment described above. In other words, the fall-off prevention device 40 is attached to the outer periphery of the wire protection tube 20 with the arc portion 41 fitted onto the outer periphery of the wire insertion portion 21.

[0091] Note that, similar to the removal method of the present embodiment described above, the attachment / detachment tool 60 of the present embodiment can also be used to remove the fall-off prevention device 40 attached to the wire protection tube 20 from the wire protection tube 20. Although a detailed explanation will be omitted, the fall-off prevention device 40 can be removed from the wire protection tube 20 by performing the operations in the reverse direction to those performed when attaching the fall-off prevention device 40 described above.

[0092] (5f) In the above embodiment, a configuration has been exemplified in which a fall-off prevention device 40 is attached to one wire protection tube 20 shown in FIGS. 15 and 16 that covers the outside of the electric wires 10. That is, in the above embodiment, only the electric wires 10 are inserted inside the wire protection tube 20 to which the fall-off prevention device 40 is attached. However, objects other than the electric wires 10 may also be inserted inside the wire protection tube to which the fall-off prevention device 40 is attached. The fall-off prevention device 40 can hold the wire protection tube together with objects other than the electric wires 10 so that they cannot be expanded. Here, one example of an object other than the electric wires 10 is another wire protection tube described below.

[0093] For example, multiple electric wire protection tubes may be attached to electric wires depending on the length of the electric wires to be protected. When multiple electric wire protection tubes are attached to electric wires in this way, the multiple electric wire protection tubes are connected together so that one end of one electric wire protection tube overlaps one end of another electric wire protection tube. It is preferable that the one electric wire protection tube and the other electric wire protection tube have the same shape.

[0094] FIG. 17 shows a wire protection tube that can be connected as described above. The wire protection tube 20a shown in FIG. 17 has a first joint 24a at one end and a second joint 24b at the other end. The first joint 24a is an insertion terminal that is inserted into the second joint 24b of another wire protection tube 20a, and the second joint 24b is a joint into which the first joint 24a of yet another wire protection tube 20a is inserted. An arrowhead-shaped locking piece 24c is formed at the tip of the first joint 24a. An enlarged diameter portion 24d that is flared and enlarged is formed at the tip of the second joint 24b. The main portion of the second joint 24b has an enlarged diameter such that the inner diameter is larger than the outer diameter of the first joint 24a. A groove 24e into which the locking piece 24c is engaged is formed at the back of the second joint 24b. A plurality of such electric wire protection tubes 20a are attached to the electric wires 10 in a connected state.

[0095] The fall-off prevention device 40 may be attached to, for example, the portion where two electric wire protection tubes overlap. This allows the two electric wire protection tubes to be held in the overlapping portion by a single fall-off prevention device 40 so that they cannot be expanded. In this case, the fall-off prevention device 40 can be attached to the overlapping portion of the two electric wire protection tubes using the above-mentioned attachment / detachment tool 60. The fall-off prevention device 40 attached to the overlapping portion of the two electric wire protection tubes can also be removed using the above-mentioned attachment / detachment tool 60.

[0096] As shown in FIG. 18, when two wire protection tubes 20a are connected, the first joint 24a of the first wire protection tube 20a is inserted into the second joint 24b of the second wire protection tube 20a, forming an overlapping portion 25 where the portions of the two tubes with different diameters overlap. At this time, the locking piece 24c fits into the groove 24e. The captive device 40 is attached to the overlapping portion 25 formed when the two wire protection tubes 20a are connected. That is, as shown in FIG. 19, the captive device 40 is attached so as to directly surround the second joint 24b of the second wire protection tube 20a, but the first joint 24a of the first wire protection tube 20a is positioned inside the second joint 24b. This allows the captive device 40 to hold the two connected wire protection tubes so that they cannot be expanded. At this time, the fall prevention device 40 can be attached to the overlapping portion 25 of the two wire protection tubes 20a using the attachment / detachment tool 60 described above. The fall prevention device 40 attached to the overlapping portion 25 of the two wire protection tubes 20a can also be removed using the attachment / detachment tool 60 described above. The pair of protruding pieces 22a and 22b at the second joint 24b are spaced apart more widely than the protruding pieces 22 at other portions. As a result, the protruding pieces 22a and 22b can sandwich the pair of protruding pieces 22 provided at the first joint 24a. The protruding end of the protruding piece 22a bends and extends toward the protruding piece 22b, covering the pair of protruding pieces 22 provided at the first joint 24a.

[0097] Of course, the specific shapes of connectable wire protection tubes are not limited to the configurations described above. The fall-off prevention device 40 may also be attached to the second joint portion 24b of another wire protection tube 20a when the first joint portion 24a of the other wire protection tube 20a is not inserted.

[0098] (5g) The function of one component in the above embodiments may be distributed among multiple components, or the functions of multiple components may be integrated into one component. Also, part of the configuration of the above embodiments may be omitted. Furthermore, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. All aspects included in the technical idea identified by the wording of the claims are embodiments of the present disclosure.

[0099] [Technical idea disclosed in this specification] [Item 1] A tool for attaching a fall-off prevention device to at least one electric wire protection tube, the fall-off prevention device holding at least one electric wire protection tube in an unexpandable state, the electric wire protection tube having a cylindrical electric wire insertion portion that can be freely expanded by a slit provided along the axial direction and having protruding pieces extending outward from both ends of the slit, or for removing the fall-off prevention device from the at least one electric wire protection tube, The fall prevention tool is an arcuate portion that extends in an arc shape from the first end to the second end and covers the wire insertion portion; a leg portion connected to the first end portion and covering the protruding piece; a hook provided at a predetermined position on the outer peripheral surface of the arc portion and extending radially outward of a circle that is a part of the arc described by the arc portion; Equipped with the at least one electric wire protection tube is configured to be able to be inserted and removed through an opening formed between the second end portion and the leg portion, The attachment / detachment tool is A base and a first locking portion provided on the base, to which the leg portion is locked when the fall-off prevention device is held by the attachment / detachment tool, and a second locking portion to which the hook piece is locked; Equipped with In the held state, the fall-off prevention tool is disposed relative to the attachment / detachment tool so that the opening faces away from the base portion, An attachment / detachment tool configured such that the first and second locking portions suppress movement in a direction intersecting the axial direction of a ring formed by a circle that is part of the arc described by the arc portion of the anti-fall-off device in the held state.

[0100] [Item 2] The attachment / detachment tool according to item 1, The attachment / detachment tool has a suppression portion formed on the base portion that prevents the fall-off prevention device from moving in the axial direction and falling off in the held state.

[0101] [Item 3] The attachment / detachment tool according to item 1 or 2, the base is provided with a pressing portion that is located in a gap formed between the fall-off prevention device and the base in the held state, and that abuts against the fall-off prevention device to press the fall-off prevention device in a predetermined direction, The pressing portion is formed of an elastic member.

[0102] [Item 4] The attachment / detachment tool according to any one of items 1 to 3, a rotation axis is further provided at a predetermined position in a direction toward the second locking portion relative to a position where the first locking portion is provided on the base, A removal tool in which the base and a gripping portion that is gripped by a user of the removal tool or a connecting portion that connects the gripping portion and the base rotate around the rotation axis.

[0103] [Item 5] Item 4: The attachment / detachment tool according to item 4, The attachment / detachment tool further includes an adjustment portion that adjusts slidability on the rotation shaft by changing the frictional force between the connecting portion and the base portion.

[0104] [Item 6] The attachment / detachment tool according to any one of items 1 to 5, the at least one electrical cable protection conduit is two or more electrical cable protection conduits; The fall prevention device is an attachment / detachment tool that is attached to the overlapping portion formed when the two or more electric wire protection tubes are connected. [Explanation of symbols]

[0105] 10...electric wire, 20, 20a...electric wire protection tube, 21...electric wire insertion portion, 22, 22a, 22b...projecting piece, 23...split portion, 24a...first joint portion, 24b...second joint portion, 24c...locking piece, 24d...expanded diameter portion, 24e...groove, 25...overlapping portion, 40...fall-off prevention device, 41...arc portion, 42...leg portion, 42a, 72a...groove portion, 43, 731...guiding piece, 44...hook piece, 45...opening, 51, 721...first wall portion, 52...second wall portion, 53, 722...folded portion, 60...attachment / detachment tool, 61...main body portion, 62...socket socket portion, 63...shaft member, 64...adjustment portion, 71...base portion, 71a...right side surface, 71b...left side surface, 72...first locking portion, 73...second locking portion, 74a...first suppression portion, 74b...second suppression portion, 75a...first pressing portion, 75b...second pressing portion, 76...connecting portion, 411, 711...first end portion, 412, 712...second end portion, 521...unconnected end portion, 621...first connecting groove, 622...wall portion, 623, 761...through hole, 624...second connecting groove, 625...flat surface, 626...recessed portion, 631...head portion, 632...rod portion.

Claims

1. A tool for attaching a fall-off prevention device to at least one wire protection tube, the fall-off prevention device holding at least one wire protection tube in an unexpandable state, the at least one wire protection tube having a cylindrical wire insertion portion that can be freely expanded by a slit provided along the axial direction and having protruding pieces extending outward from both ends of the slit, or for removing the fall-off prevention device from the at least one wire protection tube, The fall prevention tool is an arcuate portion that extends in an arc shape from the first end to the second end and covers the wire insertion portion; a leg portion connected to the first end portion and covering the protruding piece; a hook provided at a predetermined position on the outer peripheral surface of the arc portion and extending radially outward of a circle that is a part of the arc described by the arc portion; Equipped with the at least one electric wire protection tube is configured to be able to be inserted and removed through an opening formed between the second end portion and the leg portion, The attachment / detachment tool is A base and a first locking portion provided on the base, to which the leg portion is locked when the fall-off prevention device is held by the attachment / detachment tool, and a second locking portion to which the hook piece is locked; Equipped with In the held state, the fall-off prevention tool is disposed relative to the attachment / detachment tool so that the opening faces away from the base portion, An attachment / detachment tool configured so that the first and second locking portions suppress movement in a direction intersecting the axial direction of a ring formed by a circle that is part of the arc described by the arc portion of the anti-fall-off device in the held state.

2. The attachment / detachment tool according to claim 1, The attachment / detachment tool has a suppression portion formed on the base portion that prevents the fall-off prevention device from moving in the axial direction and falling off in the held state.

3. The attachment / detachment tool according to claim 1 or 2, the base is provided with a pressing portion that is located in a gap formed between the fall-off prevention device and the base in the held state, and that abuts against the fall-off prevention device to press the fall-off prevention device in a predetermined direction, The pressing portion is formed of an elastic member.

4. The attachment / detachment tool according to claim 1 or 2, a rotation axis is further provided at a predetermined position in a direction toward the second locking portion relative to a position where the first locking portion is provided on the base, A removal tool in which the base and a gripping portion that is gripped by a user of the removal tool or a connecting portion that connects the gripping portion and the base rotate around the rotation axis.

5. The attachment / detachment tool according to claim 4, The attachment / detachment tool further includes an adjustment portion that adjusts slidability on the rotation shaft by changing the frictional force between the connecting portion and the base portion.

6. The attachment / detachment tool according to claim 1 or 2, the at least one electrical cable protection conduit is two or more electrical cable protection conduits; The fall prevention device is an attachment / detachment tool that is attached to the overlapping portion formed when the two or more electric wire protection tubes are connected.

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