Insulator removing tool and insulator removing method

Abstract

To provide an insulator removing tool and an insulator removing method capable of removing an insulator of a lead-in wire with a simple tool.SOLUTION: The insulator removal tool includes a main shaft member 4, a movable member 5 capable of changing an angle with respect to the main shaft member 4, a first fixing member 6 fixed to the main shaft member 4 and configured to change a distance from the movable member 5 by movement of the movable member 5, a second fixing member 7 fixed to the main shaft member 4 and configured to take an open state and a closed state with respect to the movable member 5 by movement of the movable member 5, and an operation member (10, 11) configured to perform an operation of changing the angle of the movable member 5.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an insulator removal tool and an insulator removal method. [Background technology]

[0002] Electricity is generally supplied to a house by a drop line that is hung from a utility pole. A support point is provided on the exterior wall of the house to support one end of the drop line. The support point is usually located at a high point on the exterior wall, away from the ground. An insulator is attached to one end of the drop line. The insulator is hooked onto the support point. When demolishing an old house, it is necessary to separate the drop line from the support point.

[0003] Patent Document 1 discloses a technology for performing this work of separating the drop line from the ground. The technology in this document uses two sticks: a base stick and a work stick. A support point hook is attached to the tip of the base stick, and a clamp is attached to the tip of the work stick. The base stick has a reel and a roller. The roller is located near the tip of the base stick. The rope pulled out from the reel is hung on the roller.

[0004] The support point hook at the end of the foundation stick is hooked onto the support point on the building side. The rope is pulled out further and its end is tied to the clamp at the end of the work stick. The clamp is used to grab the drop wire and, in that state, the clamp is left on the drop wire and the work stick is removed. The rope is pulled to bring the clamp towards the support point hook, putting tension on the drop wire. An electric cutter is now attached to the end of the work stick and used to cut the drop wire near its attachment point. The rope is then pulled out further, causing the clamp and the drop wire it is holding to detach from the building and hang down from the utility pole. A pair of quick pliers is now attached to the end of the work stick and used to remove the insulator from the building. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-158741 Summary of the Invention [Problem to be solved by the invention]

[0006] The above-mentioned conventional techniques have problems in that they require a wide range of tools, such as the need for two sticks, the need for accessories such as a reel or roller to operate the rope on one stick, and the need for interchangeable tip parts such as a clamp, electric cutter, or quick pliers on the other stick, etc.

[0007] An object of the disclosed technique is to provide an insulator removal tool and an insulator removal method that can remove an insulator from a drop line using a simple tool. [Means for solving the problem]

[0008] An insulator removal tool according to one aspect of the disclosed technology includes a main shaft member, a movable member that can change its angle relative to the main shaft member, a first fixed member that is fixed to the main shaft member and whose distance from the movable member varies with the movement of the movable member, a second fixed member that is fixed to the main shaft member and whose open and closed state with respect to the movable member varies with the movement of the movable member, and an operating member that is operated to change the angle of the movable member.

[0009] In the insulator removal tool of the above aspect, the movable member can be operated by the operating member. This operation can change the state of the first fixed member relative to the movable member, and can also change the state of the second fixed member relative to the movable member. The first fixed member can be placed in a state where the gap between it and the movable member is large or small. The second fixed member can be placed in an open state or a closed state relative to the movable member.

[0010] By clamping a portion of the insulator between the first fixed member and the movable member, it is possible to move the insulator using the insulator removal tool. By capturing the wires of the insulator when the second fixed member and the movable member are closed, it is possible to move the insulator via the wires using the insulator removal tool. By inserting the first fixed member between the hooks of the insulator and moving the insulator removal tool, it is possible to release the loop state of the hooks. By combining these actions, the insulator can be removed from the mounting stay.

[0011] The insulator removal tool according to the above aspect may have a support shaft that rotatably supports the movable member and that intersects with the axial direction of the main shaft member, and the movable member may have a support portion supported by the support shaft, a first arm portion on the first fixed member side of the support portion, and a second arm portion on the second fixed member side of the support portion. In this configuration, the movable member can rotate about the support shaft. This rotational movement changes the distance between the first arm portion and the first fixed member. The second arm portion can change the open / closed state of the second fixed member.

[0012] Here, it is desirable that the first arm portion has a curved shape that is curved toward the first fixing member, which makes it easy to clamp a portion of the insulator between the first arm portion and the first fixing member.

[0013] The insulator removal tool according to any of the above aspects may have a connecting member connected to the main shaft member and provided with a first fixing member, and a third fixing member provided separately from the first fixing member on the connecting member. Using the third fixing member facilitates, for example, the temporary removal of the insulator hook in a looped state. This is because the third fixing member is provided separately from the first fixing member and is separated from the movable member. Furthermore, it is desirable for the operating member to change only the angle of the movable member, without moving the connecting member.

[0014] In another aspect of the disclosed technique, an insulator removal method is provided for removing an insulator having a hook pair and a main body that face each other to form a loop, the insulator being connected to an electric wire, and the loop formed by the hook pair being caught in a window of the mounting stay, from the mounting stay. The insulator removal tool described above is used to insert the first arm portion on the first fixing member side with respect to the main shaft member of the movable member into the loop from the opposite side, and the first hook, which is the part of the hook pair that passes outside the window and is connected to the main body, is clamped between the first fixing member and the first arm portion, and the mating portion of the loop is The insulator removal tool is moved so as to allow the insulator to escape through the window, and the first arm portion or the first fixed member is used to pull the first hook away from the second hook, which is the part of the hook pair that passes through the window and is connected to the main body, to open the loop, the operating member is used to operate the movable member to open the second fixed member, the electric wire is captured between the second fixed member and the second arm portion on the second fixed member side relative to the main shaft member of the movable member, and with the electric wire captured between the second fixed member and the second arm portion, the operating member is used to operate the movable member to close the second fixed member, and the second hook is allowed to escape through the window and the insulator is removed from the mounting stay. [Effects of the Invention]

[0015] According to the disclosed technique, an insulator removal tool and an insulator removal method are provided that can remove insulators from drop lines using simple tools. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a front view of an entire insulator removal tool according to an embodiment; [Figure 2] FIG. 1 is a perspective view (part 1) of a main body of an insulator removal tool. [Figure 3] FIG. 2 is a perspective view (part 2) of the main body of the insulator removal tool. [Figure 4] FIG. 2 is a perspective view showing the main shaft member in a standalone state. [Figure 5] FIG. 2 is a perspective view showing a movable member in a standalone state. [Figure 6]FIG. 10 is a perspective view showing the connecting member in a standalone state. [Figure 7] FIG. 10 is a perspective view showing a second fixing member in a standalone state. [Figure 8] 10A and 10B are front views showing the operation of the movable member in the main body portion. [Figure 9] 1 is a perspective view showing a DV wire dead-end insulator, which is the object of work in an embodiment, together with an insulator removal tool. FIG. [Figure 10] FIG. 1 is a schematic diagram showing the state of DV line wiring in a house. [Figure 11] 1 is a perspective view showing a looped state and an open state of a hook of a DV wire dead-end insulator. FIG. [Figure 12] FIG. 10 is a perspective view showing the state of attachment of a DV wire dead-end insulator to an attachment stay. [Figure 13] FIG. 1 is a perspective view (part 1) illustrating a method for removing an insulator using an insulator removal tool. [Figure 14] FIG. 10 is a perspective view (part 2) illustrating a method for removing an insulator using an insulator removal tool. [Figure 15] FIG. 10 is a perspective view (part 3) illustrating a method for removing an insulator using an insulator removal tool. [Figure 16] FIG. 10 is a perspective view (part 4) illustrating a method for removing an insulator using an insulator removal tool. [Figure 17] FIG. 5 is a perspective view (part 5) illustrating a method for removing an insulator using an insulator removal tool. [Figure 18] FIG. 6 is a perspective view (part 6) illustrating a method for removing an insulator using an insulator removal tool. [Figure 19] FIG. 7 is a perspective view (part 7) illustrating a method for removing an insulator using an insulator removal tool. [Figure 20] FIG. 8 is a perspective view (part 8) illustrating a method for removing an insulator using an insulator removal tool. DETAILED DESCRIPTION OF THE INVENTION

[0017] An embodiment that embodies the present disclosure will be described. As shown in FIG. 1, an insulator removal tool 1 according to this embodiment has a main body 2 and an operating rod 3. The main body 2 is attached to the tip of the operating rod 3. A general-purpose operating rod 3 may be used. The operating rod 3 in the example of FIG. 1 has an extendable function.

[0018] As shown in Figures 2 and 3, the main body 2 of the insulator removal tool 1 has a main shaft member 4, a movable member 5, a first fixed member 6, a second fixed member 7, a third fixed member 8, and a connecting member 9. The main shaft member 4 is a cylindrical member with one open end and one closed end. The tip of the operating rod 3 is inserted into the open side of the main shaft member 4. In this way, the main shaft member 4 is attached to the tip of the operating rod 3. The main shaft member 4 and the operating rod 3 are detachable. However, in terms of the use of the insulator removal tool 1, there is no particular situation in which it is necessary to detach the main shaft member 4 from the operating rod 3.

[0019] The movable member 5 is a member that can change its angle relative to the main shaft member 4. The first fixed member 6, the second fixed member 7, and the third fixed member 8 are all members that are fixed to the main shaft member 4. The first fixed member 6 is a member whose distance from the movable member 5 varies depending on the movement of the movable member 5. The second fixed member 7 is a member that takes an open state or a closed state relative to the movable member 5 depending on the movement of the movable member 5. The second fixed member 7 in Figures 2 and 3 is in the closed state. The third fixed member 8 is a member that is not particularly related to the movement of the movable member 5. The connecting member 9 is a member that is connected to the main shaft member 4. The first fixed member 6 and the third fixed member 8 are both provided on the connecting member 9. However, the first fixed member 6 and the third fixed member 8 are separate members.

[0020] The main body 2 is further provided with a pull string 10 and a return spring 11. A wire 16 is passed through the return spring 11. The pull string 10 and the return spring 11 are operating members that are used to change the angle of the movable member 5 relative to the main shaft member 4.

[0021] The main shaft member 4 will be further described with reference to Figure 4. The main shaft member 4 basically comprises a cylindrical portion 40 having a first arm 41 and a second arm 42 provided at one end thereof. The first arm 41 and the second arm 42 are both plate-like convex pieces that protrude upward from the upper end of the cylindrical portion 40. There is a gap between the first arm 41 and the second arm 42. A through hole 43 is formed in the first arm 41. A through hole is also formed in the second arm 42 at the same position as the through hole 43 in the first arm 41. In the following description, the through hole in the second arm 42 may also be referred to as the through hole 43.

[0022] The lower end of the cylindrical portion 40 is open. An outwardly protruding ring portion 44 is formed at one location on the lower end of the cylindrical portion 40. A through hole 45 is formed in the ring portion 44 in the vertical direction. The position at which the ring portion 44 is formed is approximately the position at the end of the edge of the first arm portion 41 and the second arm portion 42 extended in the axial direction of the main shaft member 4 (the longitudinal direction of the operating rod 3).

[0023] The movable member 5 will be further described with reference to Figure 5. The movable member 5 is basically a long, flat member. Through holes 50, 51, and 52 are formed in the movable member 5. The through hole 50 is located approximately in the center of the movable member 5 in the longitudinal direction. The through hole 50 is a support portion for attaching the movable member 5 to the through hole 43 of the main shaft member 4 with a pin 12 (see Figure 2). The through hole 50 is not a threaded hole. The pin 12 is a support shaft that rotatably supports the movable member 5 with respect to the main shaft member 4. The axial direction of the pin 12 is a direction that intersects with the axial direction of the main shaft member 4.

[0024] The portion of the movable member 5 to the left of the through hole 50 in Figure 5 is called the first arm portion 13. The first arm portion 13 is the part that is on the first fixed member 6 side of the through hole 50 in the state of Figures 2 and 3. There is a bent portion 53 in the middle of the first arm portion 13. This gives the first arm portion 13 a curved shape. As seen in Figure 2, the first arm portion 13 is bent toward the first fixed member. A thickening member 26 is attached to a part of the first arm portion 13. The portion of the first arm portion 13 where the thickening member 26 is attached is the thickened portion. In other words, it is a portion that is thicker than the portion of the movable member 5 where the thickening member 26 is not attached.

[0025] The portion of the movable member 5 to the right of the through hole 50 in Figure 5 is referred to as the second arm portion 14. The second arm portion 14 is the portion that is on the second fixed member 7 side of the through hole 50 in the state shown in Figures 2 and 3. Both through holes 51 and 52 are provided in the second arm portion 14. The through hole 51 is a hole for attaching the return spring 11. The through hole 52 is a hole for attaching the drawstring 10.

[0026] The connecting member 9 will be further described with reference to Figure 6. The connecting member 9 is a long, flat member. Through holes 90, 91, and 92 are formed in the connecting member 9. Within the connecting member 9, the through hole 90 is provided at a position away from the through holes 91 and 92. The through holes 91 and 92 are relatively close to each other. The through hole 90 is a portion for attaching the connecting member 9 to the through hole 43 of the main shaft member 4 with a pin 12 and a winged nut 15 (see Figure 3). The connecting member 9 is attached in a fixed state to the main shaft member 4.

[0027] The through hole 91 is a hole for attaching the first fixing member 6. The through hole 92 is a hole for attaching the third fixing member 8. The first fixing member 6 and the third fixing member 8 are both pin-shaped members. The first fixing member 6 and the third fixing member 8 are attached to the connecting member 9 with their backs facing each other. The attached first fixing member 6 and third fixing member 8 are both in a fixed state to the connecting member 9. In the state shown in Figures 2 and 3, the positions of both the first fixing member 6 and the third fixing member 8 are fixed relative to the main shaft member 4.

[0028] The second fixing member 7 will be further described with reference to FIG. 7. The second fixing member 7 is a wire-like member. The second fixing member 7 has a straight portion 70 and a curved portion 71 connected to the upper part of the straight portion 70. The curved portion 71 is the part where the wire is curved in a U-shape. In the state shown in FIGS. 2 and 3, a lower end 72 of the straight portion 70 is affixed to the side surface of the main shaft member 4 (cylindrical portion 40). This fixes the second fixing member 7 to the main shaft member 4. The second fixing member 7 is oriented such that the straight portion 70 is substantially parallel to the axial direction of the main shaft member 4, and the curved portion 71 faces toward the second arm portion 14.

[0029] The assembly of the main body 2 will now be described. The assembly of the main body 2 means attaching the above-mentioned members to the main shaft member 4. First, the attachment of the movable member 5 and the connecting member 9 will be described.

[0030] The movable member 5 is attached to the main shaft member 4 so that its central portion in the longitudinal direction is inserted into the gap between the first arm portion 41 and the second arm portion 42. Here, the second arm portion 14 is oriented toward the side of the main shaft member 4 where the ring portion 44 is located. The bent shape of the first arm portion 13 is made to be convex toward the lower end side of the main shaft member 4. In other words, the bent portion 53 is made to face downward.

[0031] The connecting member 9 is attached to the outer surface side of the first arm 41. The end of the elongated connecting member 9 having the through hole 90 faces the first arm 41, and the end having the through holes 91 and 92 faces upward.

[0032] The through hole 50 of the movable member 5 and the through hole 90 of the connecting member 9 are both aligned with the through holes 43 of the first arm 41 and the second arm 42. In this state, the pin 12 is inserted from the side of the second arm 42. The pin 12 passes through the through hole 43 of the second arm 42, the through hole 50 of the movable member 5, the through hole 43 of the first arm 41, and the through hole 90 of the connecting member 9. A winged nut 15 is screwed onto the tip of the pin 12 protruding from the through hole 90 of the connecting member 9. The winged nut 15 is tightened just enough to prevent the connecting member 9 from moving. In this state, the connecting member 9 is fixed, but the movable member 5 can rotate around the pin 12.

[0033] 2 and 3, the connecting member 9 is fixed at an angle rather than being fixed linearly with respect to the axial direction of the main shaft member 4. More specifically, the connecting member 9 is inclined not toward the second arm portion 14 but toward the first arm portion 13. The significance of this inclination will be explained later.

[0034] A first fixing member 6 and a third fixing member 8 are further attached to the connecting member 9. The first fixing member 6 is attached to the through hole 91, and the third fixing member 8 is attached to the through hole 92. The first fixing member 6 is attached to the connecting member 9 so as to protrude toward the side where the first piece 41, the second piece 42, and the movable member 5 are present. The third fixing member 8 is attached to the connecting member 9 so as to protrude toward the side where the first piece 41, the second piece 42, and the movable member 5 are not present.

[0035] The second fixing member 7 is attached to the main shaft member 4 so that the straight portion 70 faces downward and the curved portion 71 faces upward. More specifically, the top 73 of the curved portion 71 protrudes further upward than the top 46 of the main shaft member 4, and the end 74 of the curved portion 71 is at approximately the same height as the top 46. The curved portion 71 faces toward the second arm portion 14. The bottom end 72 of the straight portion 70 is affixed to the side surface of the cylindrical portion 40.

[0036] In the examples of Figures 2 and 3, the second fixing member 7 is arranged on the same side as the connecting member 9 with respect to the main shaft member 4. In addition, the straight portion 70 is sandwiched between the connecting member 9 and the main shaft member 4 at a position approximately in the middle. However, this is not essential. The straight portion 70 may be arranged so that the middle position passes above the connecting member 9. In addition, the second fixing member 7 may be arranged on the opposite side of the main shaft member 4 from the connecting member 9.

[0037] The attachment of the pull cord 10 will now be described. One end of the pull cord 10 is tied to the through hole 52 of the movable member 5. The pull cord 10 has a length that reaches from the through hole 52 to near the bottom end of the operating rod 3 when the insulator removal tool 1 is held upright as shown in FIG. 1, or is longer than that. A reel 17 may be provided on the operating rod 3. The pull cord 10 can be wound up around the reel 17 when the insulator removal tool 1 is stored, etc.

[0038] The attachment of the return spring 11 will now be described. First, one end of the wire 16 is fixed to the through-hole 51 of the movable member 5 with a screw 18. This can be easily done by attaching a washer or the like to one end of the wire 16 in advance. Next, the other end of the wire 16 is inserted into the return spring 11 so that the wire 16 penetrates the entire return spring 11. Then, while slightly compressing the return spring 11, the free end of the wire 16 protruding from the return spring 11 is passed from above through the through-hole 45 of the ring portion 44. As a result, the movement of the return spring 11 is restricted by the wire 16, and both ends are restricted by the second arm portion 14 and the ring portion 44.

[0039] When the compression of the return spring 11 is released in this state, the second arm portion 14 is pushed up by the reaction force of the return spring 11. This state is shown in the examples of Figures 2 and 3. It is desirable that the wire 16 be long enough so that its lower end protrudes slightly below the ring portion 44 even in this state.

[0040] In this state, when the main body 2 is viewed from the front, the end 74 of the second fixed member 7 is within a range that overlaps with the second arm 14. In other words, the second fixed member 7 is in a closed state relative to the movable member 5. In this state, the first arm 13 is also in a slightly lowered state, opposite to the second arm 14. This is because the movable member 5 rotates around the through-hole 50. Therefore, in this state, the gap between the first arm 13 and the first fixed member 6 is wide.

[0041] In the main body 2 assembled as described above, the angle of the movable member 5 relative to the main shaft member 4 can be changed by the pull string 10 and the return spring 11. This will be explained with reference to Figure 8. In Figure 8, the movable member 5 is shown in two positions, solid lines and dashed lines. Of these, the position shown by the dashed line corresponds to the state shown in Figures 2 and 3. That is, this is a state in which the second fixing member 7 is in a closed state and the first arm portion 13 is separated from the first fixing member 6.

[0042] When the pull cord 10 is pulled downward as indicated by arrow F from the dashed line state in FIG. 8, the movable member 5 rotates clockwise (arrow A) in the figure to the solid line state. In the solid line state, the end 74 of the second fixing member 7 is positioned away from the second arm portion 14. In other words, the second fixing member 7 is in an open state relative to the movable member 5. In addition, the distance between the first arm portion 13 and the first fixing member 6 is reduced compared to the dashed line state. In this state, the return spring 11 is also compressed compared to the dashed line state.

[0043] When tension on the pull cord 10 is released from the solid line state in Figure 8, the movable member 5 rotates counterclockwise (arrow B) in the figure and returns to the broken line state. This is due to the reaction force of the return spring 11. However, even when the movable member 5 moves as described above, the pin 12 does not move. Therefore, the connecting member 9, first fixing member 6, and third fixing member 8 do not move either. In other words, the pull cord 10 and return spring 11 only change the angle of the movable member 5, and do not move the connecting member 9. This is the operation of the main body 2. Note that if the wire 16 is longer than shown, the same operation can be achieved by pulling the wire 16 instead of the pull cord 10. In other words, the return spring 11 and wire 16 can function as an operating member.

[0044] Next, the insulator of the drop line that is the target of the removal work using the insulator removal tool 1 will be described with reference to Fig. 9. In Fig. 9, a DV line dead-end insulator 20 is depicted together with the main body 2 of the insulator removal tool 1. The DV line dead-end insulator 20 is an insulator for holding the end of a DV line (a vinyl-insulated electric wire for drop-in) 21 from a utility pole to a house 19 on the exterior wall of the house 19. Hereinafter, the DV line dead-end insulator 20 will be simply referred to as "insulator 20."

[0045] The insulator 20 has a main body 22 and hooks 23 and 24. Each of the hooks 23 and 24 has a shape where the tip is folded back. The hooks 23 and 24 face each other to form a loop. Hereinafter, the hooks 23 and 24 may be collectively referred to as a hook pair. In the state shown in FIG. 9, the hook pair actually forms a loop. The insulator 20 is hooked onto the mounting stay 25 by the loop of this hook pair. The mounting stay 25 is a member for hanging the insulator 20 and is provided on the exterior wall of the house 19. The solid wires 32 and 33 of the DV wire 21 are wound around the main body 22 of the insulator 20. Although there are also DV wires 21 that are three-stranded, a two-stranded DV wire is shown here as an example.

[0046] The situation of house 19 is shown in Figure 10. Mounting stay 25 is attached at a high position that is out of direct reach of people, such as on the second floor of house 19. DV line 21 is strung between utility pole 27 and insulator 20. Worker 28 can use insulator removal tool 1 to work on insulator 20 from the ground.

[0047] House 19 is scheduled for demolition, and DV wire 21 in Figure 9 has already been cut from the house 19 side. DV wire 21 and insulator 20 are the property of the electric power company, so they need to be collected before demolition of house 19 begins. For this purpose, insulator 20 is removed from mounting stay 25 using insulator removal tool 1.

[0048] As shown in Figure 11, the insulator 20 can be in a loop state or an open state with respect to its hook pair. In the loop state, both hooks 23 and 24 are in the state shown by the solid lines in Figure 11. In this state, hooks 23 and 24 partially overlap to form a loop as a whole. The area where hooks 23 and 24 overlap in the loop state is called overlapping portion 29. In the open state, both hooks 23 and 24 are in the state shown by the dashed lines in Figure 11. In this state, hooks 23 and 24 are not in contact with each other and are open. In Figure 9, the insulator 20 is in the loop state and is hooked on the mounting stay 25. Therefore, the insulator 20 will not come off the mounting stay 25 by itself.

[0049] The shape of hooks 23, 24 in their free state is the shape in the open state shown by the dashed lines. More specifically, both have a U-turn portion near their tip and a bent portion approximately in the center of their longitudinal direction. In the looped state shown by the solid lines, hooks 23 and 24 hook together at mating portion 29, preventing them from naturally detaching. The shape in the looped state is twisted at the bent portion in the center. Therefore, a narrow portion 34 is formed in the center of the looped state. At narrow portion 34, the distance between hooks 23 and 24 is narrow.

[0050] The mounting of the insulator 20 to the mounting stay 25 will be further explained with reference to Figure 12. In Figure 12, the mounting stay 25 appears as a cross section perpendicular to the plane of the paper in Figure 9. A window 30, which is a through hole, is formed in part of the horizontal surface of the mounting stay 25. The loops of the hook pair of the insulator 20 pass through the window 30. The mating portion 29 also passes through the window 30. This prevents the insulator 20 from easily coming off the mounting stay 25. More specifically, the hook 23 passes through the inside of the window 30 and is connected to the main body 22. The hook 24 passes outside the window 30 and is connected to the main body 22.

[0051] A method for removing the insulator 20 from the mounting stay 25 will now be described. The insulator removal method in this embodiment is performed by a worker 28 on the ground using an insulator removal tool 1, as shown in FIG. 10. In very general terms, this removal method involves opening the hook pair of the insulator 20 and then pulling out the hook 23 from the window 30. This is performed using the insulator removal tool 1.

[0052] First, as shown by arrow P in FIG. 9, the third fixing member 8 of the insulator removal tool 1 is inserted into the loops of the hook pair of the insulator 20. This operation is performed by moving the entire main body 2. The inserted state is shown in FIG. 13. In the state of FIG. 13, the third fixing member 8 is inserted in a direction that protrudes from the back side to the front side of the page, toward the tip side of the narrow portion 34 of the loops of the hooks 23, 24. The main body 2 of the insulator removal tool 1 in FIG. 13 is depicted in a position that is close to the position in FIG. 3 out of FIGS. 2 and 3. In FIG. 13, the first arm portion 13 is depicted protruding toward the right behind the hooks 23, 24.

[0053] The state shown in Figure 13 is changed to the state shown in Figure 14. The state shown in Figure 14 is when the entire insulator removal tool 1 is slightly twisted around its axis (arrow Q) from the state shown in Figure 13. In the state shown in Figure 14, the first arm portion 13 faces diagonally forward compared to the state shown in Figure 13. Even in the state shown in Figure 14, the third fixing member 8 remains inserted into the loop of the hook pair.

[0054] Now, let us focus on the third fixing member 8. In the state shown in FIG. 14, the angle of the third fixing member 8 relative to the plane of the paper is quite small. As a result, the third fixing member 8 is in contact with both hooks 23 and 24. More specifically, the third fixing member 8 is in contact with the hook 24 on the right side of the figure from behind, and with the hook 24 on the left side of the figure from the front. As a result, in FIG. 14, the hooks 23 and 24 are slightly spread apart by the third fixing member 8, as indicated by the arrows R.

[0055] However, at this point, the hooks 23 and 24 have not yet reached the open state described in Figure 11 because the mating portion 29 of the hooks 23 and 24 is still passing through the window 30. In other words, both the hooks 23 and 24 are restricted by the window 30. Hereinafter, this state will be referred to as the provisionally open state of the hook pair.

[0056] In this way, when the hook pair is temporarily opened by the third fixing member 8, other parts of the main body 2, such as the first arm 13, do not get in the way. As described above, the third fixing member 8 is located on the back side of the connecting member 9 and the movable member 5, etc. Therefore, the operation of temporarily opening the hook pair is easy.

[0057] Now, the third fixing member 8 is removed from the loop. This operation is performed by moving the entire main body 2. The hook pair is maintained in the temporarily opened state. Next, the first fixing member 6 and the first arm 13 are inserted into the loop. That is, the entire insulator removal tool 1 is rotated half a turn around its axis to place the main body 2 in the position shown in Figure 2, and then the first fixing member 6 and the first arm 13 are inserted into the loop, resulting in the state shown in Figure 15. This operation is also performed by moving the entire main body 2. In the state shown in Figure 15, unlike in Figure 13, the main body 2 is in a position where the first arm 13 faces left and the second arm 14 faces right.

[0058] In FIG. 15, the first fixing member 6 is inserted into the loop from the rear side, and the first arm portion 13 is inserted into the loop from the front side. In other words, the first fixing member 6 and the first arm portion 13 are inserted into the loop in opposite directions. As a result, the hook 24, which is one of the hook pair that passes outside the window 30 and is connected to the main body 22, is caught between the first fixing member 6 and the first arm portion 13. To achieve this state, it does not matter whether the first fixing member 6 or the first arm portion 13 is inserted first. Furthermore, the first fixing member 6 is located closer to the tip than the narrow portion 34, and the first arm portion 13 is located closer to the main body 22 than the narrow portion 34. Both are located outside the narrow portion 34, making insertion easy.

[0059] 15, the hook 24 is sandwiched between the first arm portion 13 and the first fixing member 6. When the main body portion 2 is moved up, down, left, or right in this state, the hook 24 and the main body 22 of the insulator 20 also move in accordance with the movement.

[0060] Therefore, the main body 2 is moved upward. This moves the entire insulator 20 upward. The state at this stage is shown in Figure 16. In the state of Figure 16, the mating portion 29 of the hook pair has escaped from the window 30. In other words, the purpose of moving the main body 2 upward is to allow the mating portion 29 to escape from the window 30. Therefore, in the state of Figure 16, only the hook 23 is still passing through the window 30, and the hook 24 is no longer passing through the window 30.

[0061] Even when the hook 24 is sandwiched between the first arm portion 13 and the first fixing member 6 as shown in Figures 15 and 16, the gap between the connecting member 9 and the first arm portion 13 is not excessively narrow. This makes it easy to sandwich the hook 24. This is because the first arm portion 13 has a curved shape due to the bend 53. If the first arm portion 13 were straight, it might be difficult to sandwich the hook 24 between the first arm portion 13 and the first fixing member 6, depending on how the hook 24 is attached. This is because the gap between the connecting member 9 and the first arm portion 13 is too wide when the drawstring 10 is not pulled, and becomes very narrow when the drawstring 10 is pulled. As a result, the hook 24 itself gets in the way, making it difficult to bring the first arm portion 13 and the first fixing member 6 close enough. In this embodiment, this is not the case because the first arm portion 13 has a curved shape.

[0062] When the drawstring 10 is pulled from the state shown in FIG. 16, the state shown in FIG. 17 is reached. In the state shown in FIG. 17, the hooks 23 and 24 are completely separated. This is because the first arm portion 13 enters the narrow portion 34 and pushes it apart due to the movement of the movable member 5. In particular, a thick portion of the thickened member 26 pushes the narrow portion 34 apart. This causes the mating portion 29 to become unhooked. In this state, the hook pair is in the open state shown by the dashed lines in FIG. 11 and no longer forms a loop. The movement from the state shown in FIG. 16 to the state shown in FIG. 17 separates the hook 24 from the hook 23. Once opened, the hook pair remains in the open state.

[0063] This operation can also be performed by moving the entire main body 2 rightward instead of pulling the pull cord 10 from the state shown in Figure 16. This is because this movement causes the first fixing member 6 to move in a direction away from the mounting stay 25. As a result, the hook 24 is pulled by the first fixing member 6 and moves, while the hook 23 is still restricted by the window 30 and cannot move. As a result, the hook 24 is also pulled away from the hook 23, and the engagement portion 29 is released. In other words, the pulling of the hook 24 from the hook 23 can be performed by either the first arm portion 13 or the first fixing member 6.

[0064] Once the state shown in Figure 17 is reached, the tension on the pull cord 10 may be released. Then, the first arm portion 13 is removed from between the hooks 23 and 24. Then, the entire insulator removal tool 1 is rotated again half a turn around its axis to return the main body portion 2 to the position shown in Figure 3. In other words, the second arm portion 14 and the second fixing member 7 are oriented toward the insulator 20.

[0065] Then, pull the pull cord 10 again. The purpose of pulling the pull cord 10 here is to open the second fixing member 7 relative to the movable member 5 (the state shown by the solid line in FIG. 8). Then, the DV wire 21 is caught between the open second fixing member 7 and the second arm portion 14 of the movable member 5. This operation is performed by moving the entire main body 2.

[0066] Then, the tension on the pull cord 10 is released, and the second fixing member 7 is placed in the closed state. The state at this point is shown in Figure 18. While Figures 13 to 17 focus on the upper side of the main body 22 of the insulator 20, Figure 18 focuses on the lower side of the main body 22. In Figure 18, the DV wire 21 passes between the second fixing member 7, which is in the closed state, and the second arm portion 14. Therefore, the DV wire 21 is restrained by the main body portion 2.

[0067] In this state, the entire insulator removal tool 1 is moved upward. Then, as shown in Figure 19, the main body 22 of the insulator 20 is also lifted up by being pulled by the DV wire 21. In the state of Figure 19, the entire main body 22 is positioned above the mounting stay 25. From the main body 22 in this position, the hooks 23 and 24 extend toward the mounting stay 25 diagonally downward to the left in the figure. In Figure 19, the tip 31 of the hook 23 is facing upward.

[0068] 19, the main body 22 is lowered using the insulator removal tool 1 while ensuring that the hook 23 does not come into contact with the edge of the window 30. This causes the tip 31 of the hook 23 to escape from the window 30. As a result, the insulator 20 is removed from the mounting stay 25, as shown in FIG. 20. The insulator removal tool 1 is then operated to lower the main body 2 and the insulator 20 to the ground. The pull cord 10 is then pulled to open the second fixing member 7, and the DV wire 21 is detached from the main body 2.

[0069] The above is the method for removing the insulator 20 from the mounting stay 25 according to this embodiment, which is performed using the insulator removal tool 1. With this method, removal is possible essentially without using any other tools, using only the insulator removal tool 1. In addition, the worker does not need to climb to the high position where the mounting stay 25 is located.

[0070] A supplementary explanation will be given regarding the inclination angle of the connecting member 9 relative to the axial direction of the main shaft member 4. In the above explanation, this inclination angle was fixed and directed toward the first arm portion 13, not the second arm portion 14 (see FIG. 2, etc.). The fact that the connecting member 9 is inclined toward the first arm portion 13 means that the distance between the first arm portion 13 and the first fixing member 6 is shorter than when the connecting member 9 is inclined toward the second arm portion 14. This makes it easier to clamp the hook 24 between the first arm portion 13 and the first fixing member 6 (FIG. 16). This is because the pull length of the drawstring 10 is small.

[0071] It is possible to adjust the inclination angle of the connecting member 9 relative to the main shaft member 4. This can be done by temporarily loosening the winged nut 15 in FIG. 3, changing the angle of the connecting member 9, and then retightening the winged nut 15. However, once the connecting member 9 is fixed to the main shaft member 4, there is usually no need to change the angle thereafter. For this reason, in the description of this embodiment, the first fixing member 6 and the third fixing member 8 attached to the connecting member 9 are considered to be fixed, not movable.

[0072] As explained in detail above, the insulator removal tool 1 according to this embodiment has the main shaft member 4, the movable member 5, the first fixed member 6, and the second fixed member 7. The movable member 5 is moved by the pull string 10 and the return spring 11. This enables the insulator 20 hooked on the mounting stay 25 to be removed from the mounting stay 25 by operation from the ground. Thus, an insulator removal tool and an insulator removal method have been realized that can remove insulators from drop lines with simple tools.

[0073] Note that this embodiment is merely an example and does not limit the disclosed technology in any way. Therefore, the disclosed technology can naturally be improved and modified in various ways without departing from the spirit and scope thereof. The specific shapes of each of the main shaft member 4, movable member 5, first fixed member 6, second fixed member 7, third fixed member 8, and connecting member 9 do not have to be as shown in the drawings. They may be any members that are capable of performing the described operations. The curved shape of the first arm portion 13 of the movable member 5 is not limited to a shape having a bent portion 53, and may be a shape that is curved as a whole. The thickened member 26 may be integrally molded with the movable member 5.

[0074] The operating member for operating the movable member 5 can also be modified in various ways. In the above embodiment, a pull cord 10 and a return spring 11 are used, but a pull spring can be used for the return spring 11 instead of a compression spring. In that case, the pull spring is attached to the movable member 5 at the first arm 13 instead of the second arm 14. A rod can also be used instead of the pull cord 10. In that case, the return spring 11 is not necessary. This is because a rod can perform not only pulling but also pushing operations. Furthermore, the movement of the movable member 5 can be motorized.

[0075] The insulator 20 may also have a shape different from that shown in the figure. The same applies to the mounting stay 25. Furthermore, as shown in FIG. 9, the mounting stay 25 may have windows 30 formed not only on the horizontal surface but also on the vertical surface. The hook pairs of the insulator 20 may also be hooked onto the windows 30 on the vertical surface. Even in such cases, the insulator can be removed using the insulator removal tool 1 of this embodiment or a modified version thereof. [Explanation of symbols]

[0076] 1 Insulator removal tool 16 Wire 2 Main body 20 DV wire dead-end insulator 4 Main shaft member 21 DV wire 5 Movable member 22 Main body 6 First fixing member 23 Hook 7 Second fixing member 24 Hook 8 Third fixing member 25 Mounting stay 9 Connecting members 26 Thickening members 10 Drawstring 29 Joint 11 Return spring 30 Window 12 pin 50 through hole 13 First arm part 53 Bending point 14 Second arm section

Claims

1. A main shaft member; a movable member that can change its angle relative to the main shaft member; a first fixed member fixed to the main shaft member, the distance between the first fixed member and the movable member varying with the movement of the movable member; a second fixed member fixed to the main shaft member, the second fixed member being adapted to take an open state or a closed state relative to the movable member in response to movement of the movable member; and an operating member for operating to change the angle of the movable member.

2. The insulator removal tool according to claim 1, a support shaft that rotatably supports the movable member and that extends in a direction intersecting the axial direction of the main shaft member; The movable member is a support portion supported by the support shaft; a first arm portion on the first fixing member side with respect to the support portion; a second arm portion on the second fixing member side relative to the support portion, The first arm portion has a curved shape that is curved toward the first fixing member.

3. The insulator removal tool according to claim 1 or 2, a connecting member connected to the main shaft member and provided with the first fixing member; a third fixing member provided separately from the first fixing member on the connecting member, The operating member changes only the angle of the movable member and does not move the connecting member.

4. A method for removing an insulator from a mounting stay, the insulator having a hook pair and a main body that form a loop facing each other, the insulator being connected to an electric wire, and the loop formed by the hook pair being hooked in a window of the mounting stay, comprising: A main shaft member; a movable member that can change its angle relative to the main shaft member; a first fixed member fixed to the main shaft member, the distance between the first fixed member and the movable member varying with the movement of the movable member; a second fixed member fixed to the main shaft member, the second fixed member being adapted to take an open state or a closed state relative to the movable member in response to movement of the movable member; an operating member for performing an operation to change the angle of the movable member, the first fixed member and a first arm portion of the movable member that is on the first fixed member side with respect to the main shaft member are inserted into the loop from the opposite side, The first fixing member and the first arm portion clamp the first hook of the hook pair, which is the one that passes outside the window and is connected to the main body, moving the insulator removal tool so that the mating portion of the loop escapes through the window; using the first arm portion or the first fixing member to separate the first hook from the second hook of the hook pair that passes through the window and is connected to the main body to open the loop; The movable member is operated by the operating member to set the second fixed member in an open state; the electric wire is caught between the second fixed member and a second arm portion of the movable member that is on the second fixed member side with respect to the main shaft member; With the electric wire held between the second fixing member and the second arm portion, the movable member is operated with the operating member to place the second fixing member in a closed state; The insulator removing method includes removing the second hook from the window to remove the insulator from the mounting stay.

Images