Live wire branching tool and electric wire installation method with live wire branching tool

Abstract

A wire gripper (70A) comprises a first connection unit (30), and a telescopic device (10) comprises a second connection unit (50). The first connection unit (30) includes a guide groove (33), a lock slider (36), and an operation ring (39). An upper end (PE) of the guide groove (33) is open. The lock slider (36) locks a state in which the first connection unit (30) and the second connection unit (50) are connected. The operation ring (39) is operated for unlocking. The second connection unit (50) includes a protrusion (52) that is movable along the guide groove (33). The protrusion (52) is movable in a direction along an electric wire between a first position (P1) and a second position (P2) inside the guide groove (33). The guide groove (33) is formed such that the first position (P1) is connected to the upper end (PE) via the second position (P2). In the state in which the first connection unit (30) and the second connection unit (50) are connected, the protrusion (52) is at the first position (P1). The lock slider (36) prevents the protrusion (52) from moving from the first position (P1) to the second position (P2).

Description

Live line sorting tool and live line sorting tool wire installation method

[0001] The present invention relates to a live line sorting tool including an extender and a wire gripper.

[0002] Patent Document 1 discloses a device for supporting and tensioning a covered electric wire, which is used when cutting a covered electric wire while it is in an overhead state. This device for supporting and tensioning a covered electric wire includes a pair of wire grippers for gripping the covered electric wire and a long-length expander. Each wire gripper is connected to the expander via a connector.

[0003] Patent Document 1 discloses a hook as an example of a connector. The hook is attached to an extender and is composed of a hook portion and a retaining member. The hook portion is provided so as to open at the top, and the retaining member is arranged to close this open portion. A connector provided on a wire gripper is connected to the hook portion.

[0004] Patent Document 1 discloses that when carrying out construction work, a pair of wire grippers are fixed to the insulated electric wire at a predetermined distance, and then an expander is placed between the pair of wire grippers to engage a connecting device.

[0005] Japanese Patent Application Laid-Open No. 2020-145818

[0006] Patent Document 1 discloses that a remote control tool is used to grasp the support ring of a wire gripper, suspend it from a covered electric wire (linear body), and then the inlet closing means can be lowered with a hook bar, but this requires two operations using the remote control tool. If the inlet closing means of the wire gripper could be simultaneously accomplished by suspending the wire gripper from the covered electric wire (linear body) with the remote control tool and detaching the remote control tool from the wire gripper, work efficiency would be improved.

[0007] In Patent Document 1, the wire grippers at both ends are suspended from the insulated electric wire (linear body) using a remote-controlled tool, and then the stretcher is connected to the wire grippers using the remote-controlled tool. However, the distance between the wire grippers, the insulated electric wire (linear body), and the wire grippers is narrow, so there is room for improvement in the efficiency of the work of connecting the stretcher.

[0008] Although Patent Document 1 discloses that the pair of wire grippers are removed from the insulated wire after the work, it is unclear whether the connection by the connector is released before that and only the extension device is removed. If the connection by the connector can be released first and only the extension device can be removed and lowered, it is thought that the physical burden on the worker can be reduced.

[0009] However, in the configuration of Patent Document 1, when releasing the connection between the wire gripper and the expander by the loop, it was necessary to use some kind of tool to push down the retaining member of the loop toward the inside of the hook portion to create a gap between the retaining member and the hook portion, and then remove the connector upward from the hook portion through this gap.As a result, the tool gets in the way of the connector trying to remove upward, which reduces the efficiency of the disconnection work and leaves room for improvement.

[0010] The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the efficiency of the work of attaching and detaching a main body to and from a wire gripper. Means to solve the problem and effects

[0011] The problem to be solved by the present invention is as described above. Next, the means for solving this problem and the effects thereof will be explained.

[0012] According to a first aspect of the present invention, there is provided a live line sorting tool having the following configuration. That is, the live line sorting tool includes an extender and a wire gripper. The extender is extendable and retractable. The wire gripper is capable of gripping an electric wire. The extender includes a first connection portion. The wire gripper includes a second connection portion. The first connection portion includes a guide groove, a locking member, and an operating member. The guide groove has an open upper end. The locking member locks the first connection portion and the second connection portion in a connected state. The operating member is operated to release the lock provided by the locking member. The second connection portion includes a protrusion that is movable along the guide groove. The protrusion is movable within the guide groove in a direction along the electric wire between a first position that is lower than the upper end and a second position that is lower than the upper end. The guide groove is formed so that the first position is connected to the upper end via the second position. When the first connection portion and the second connection portion are connected, the protrusion is in the first position, and the locking member prevents the protrusion from moving from the first position to the second position.

[0013] This allows the first and second connection parts to be separated when attaching or detaching the live-line sorting tool to or from an electric wire, thereby reducing the weight supported by the operator and easing physical strain. Once the first and second connection parts are connected, the locking member locks them, preventing unintended separation. Once connected, the protrusion cannot be removed from the upper end of the guide groove without moving horizontally from the first position and passing through the second position. The locking member is configured to prevent the protrusion from moving from the first position to the second position. Therefore, compared to a configuration in which the upper end of the guide groove is locked with some kind of member, it is easy to position the locking member below the first connection part. Therefore, a layout that allows the lock to be released without raising the operating tool to near the upper end of the guide groove can be easily realized. Because there is no need to operate the operating tool near the upper end of the guide groove, the operating tool is less likely to get in the way of the protrusion attempting to remove upward from the upper end of the guide groove, making the separation process smoother.

[0014] The live line sorting tool preferably has the following configuration: the locking member is movable between a locked position and an unlocked position lower than the locked position; the first connection portion includes a biasing member that biases the locking member toward the locked position; when the locking member is in the locked position, the protrusion is prevented from moving from the first position to the second position; and when the locking member is in the unlocked position, the protrusion is allowed to move from the first position to the second position.

[0015] This allows the locking member to be easily switched between the locked state and the unlocked state by moving the locking member.

[0016] In the live line sorting tool, it is preferable that the locking member slides up and down between the lock position and the unlock position.

[0017] This simplifies the configuration for moving the locking member.

[0018] In the live wire sorting tool, it is preferable that the operating member is disposed at a position lower than a lower end of the guide groove.

[0019] This allows the lock to be released by operating the operating member at a low position, improving operability.

[0020] In the live wire sorting tool, it is preferable that the guide groove bends one or more times between the second position and the upper end.

[0021] As a result, the protrusion at the first position of the guide groove cannot escape from the upper end of the guide groove unless it passes through the complex-shaped guide groove, thereby reliably preventing the first and second connecting parts from being accidentally separated.

[0022] In the live line sorting tool, it is preferable that when the convex portion is in the first position, the extender is rotatable up and down around the first position relative to the wire gripper.

[0023] This allows the connecting portion to move like a joint while the first connecting portion and the second connecting portion are connected, thereby improving the operability of the live line sorting tool.

[0024] The live line sorting tool preferably has the following configuration: The locking member is movable between a locked position and an unlocked position that is lower than the locked position. The first connecting portion has a recess with an open upper end. The second connecting portion has a boss portion that can be inserted into the recess. The convex portion moves integrally with the boss portion. The locking member protrudes into the recess at the locked position. When the locking member is in the locked position, the protruding portion of the locking member into the recess comes into contact with the boss portion, thereby preventing the convex portion from moving from the first position to the second position.

[0025] This allows the first connecting portion to be made smaller. Furthermore, since the locking member is configured to protrude into the recess, the locking member can be protected from external impacts.

[0026] In the live line sorting tool, when a force is applied in a direction to move the expander away from the wire gripper while the first connection portion and the second connection portion are connected, it is preferable that a force is applied to the convex portion or the guide groove in a direction opposite to the direction that moves the convex portion relatively from the first position to the second position.

[0027] This allows the force generated by contracting the expander to be used to hold the protrusion in the first position, thereby reliably preventing unintentional separation of the first connecting part and the second connecting part.

[0028] The live line sorting tool preferably has the following configuration: the locking member is movable between a locked position and an unlocked position that is lower than the locked position, and the first connection part includes a holding mechanism that holds the locking member at the unlocked position.

[0029] This allows the unlocked state to continue without continuously applying an operating force to the operating member, thereby facilitating the task of separating the first connecting portion and the second connecting portion.

[0030] The live line sorting tool preferably has the following configuration. Specifically, the locking member slides up and down between the locked position and the unlocked position. The holding mechanism includes a restricting protrusion and a holding member. The holding member has a vertical movement groove formed therein. When the locking member is in the unlocked position, the locking member can be switched between a state in which the phase of the movement groove and the phase of the restricting protrusion are aligned and a state in which they are not aligned, as the operating member rotates. When the phase of the restricting protrusion and the phase of the movement groove are aligned, the restricting protrusion can move relatively up and down within the movement groove as the locking member moves up and down. When the phase of the restricting protrusion and the phase of the movement groove are not aligned, the restricting protrusion comes into contact with the holding member, thereby holding the locking member in the unlocked position.

[0031] This makes it possible to switch between holding the unlocked state by the holding mechanism and not holding it by a simple operation of rotating the operating member.

[0032] In the live line sorting tool, it is preferable that at least a portion of at least one of the wire gripper and the expander is made of a magnesium alloy.

[0033] By using a magnesium alloy as the material for the wire gripper or expander, the wire gripper or expander becomes lighter than conventional ones, which further reduces the physical burden on the worker during work.

[0034] According to a second aspect of the present invention, there is provided an electric wire installation method for the above-mentioned live line sorting tool, as follows: In this electric wire installation method, the wire gripper separated from the expander is attached to the electric wire, and the first connection part provided on the wire gripper attached to the electric wire is connected to the second connection part provided on the expander.

[0035] This reduces the weight that the worker must support during the installation process of the live line sorting tool, thereby reducing the physical burden.

[0036] 1 is a front view showing the overall configuration of the live line sorting tool of this embodiment; FIG. 2 is a sectional perspective view showing the configuration for connecting the wire grippers and the live line sorting tool main body; FIG. 3 is a sectional view explaining how the boss portion is inserted into the recess and the working protrusion portion is inserted into the guide groove in order to connect the wire grippers and the live line sorting tool main body; FIG. 4 is a sectional view showing how the protrusion portion is positioned halfway along the guide groove; FIG. 5 is a sectional view showing how the connecting operation is completed and the slide pin is in the locked position; FIG. 6 is a sectional view showing how the operation ring is pulled down and the slide pin is moved to the unlocked position in order to separate the wire grippers and the live line sorting tool main body; FIG. 7 is a sectional view showing how the slide pin is held in the unlocked position by the holding mechanism; FIG. 8 is a front view showing how one of a pair of wire grippers is hung on an insulated electric wire in order to install the live line sorting tool; FIG. 9 is a front view showing how the wire gripper is hung on an insulated electric wire; FIG. 10 is a front view showing how an expander is connected to the wire gripper. 1 is a front view showing the operation of connecting an expander to the remaining wire gripper of the pair when the remaining wire gripper is hooked on an insulated electric wire. FIG. 2 is a front view showing the operation of separating an expander from a wire gripper on one side in order to remove the live line sorting tool. FIG. 3 is a front view showing the operation of separating an expander from a wire gripper on the opposite side. FIG. 4 is a cross-sectional view showing a modified example of the live line sorting tool.

[0037] Next, an embodiment of the present invention will be described with reference to the drawings.

[0038] The live line sorting tool 100 shown in Fig. 1 is used in construction work for cutting an overhead insulated electric wire (electric wire) 90. The live line sorting tool 100 includes an expander 10 and wire grippers 70A and 70B.

[0039] In the following, when describing the configuration of the live line sorting tool 100, a direction parallel to the insulated electric wire 90 when the tool is installed on the insulated electric wire 90 may be referred to as the left-right direction. Also, a direction perpendicular to both the left-right direction and the up-down direction may be referred to as the front-rear direction. Figure 1 is a view of the live line sorting tool 100 as seen from the front.

[0040] When performing construction work, a pair of wire grippers 70A, 70B are attached to one insulated electric wire 90, and the extender 10 is positioned to connect the pair of wire grippers 70A, 70B. Because the wire grippers 70A, 70B are configured substantially symmetrically, the configuration of the wire gripper 70A will be described below as a representative.

[0041] The wire gripper 70A comprises a main body 71, a fixed gripping portion 72, a movable gripping portion 73, an opening / closing cover 74, a lever portion 75, a screw shaft 76, a tapered portion 77, and a grip lock operating portion 78.

[0042] The main body 71 is a base member to which various components constituting the wire gripper 70 A are attached. A fixed gripper 72 is fixed to the upper end of the main body 71.

[0043] The movable gripping portion 73 is attached to the main body 71 below the fixed gripping portion 72. The movable gripping portion 73 is movable up and down relative to the main body 71. The fixed gripping portion 72 and the movable gripping portion 73 are arranged to face each other in the vertical direction. Although not shown, each of the fixed gripping portion 72 and the movable gripping portion 73 has a long, narrow groove formed therein that can accommodate the upper or lower portion of the insulated electric wire 90. The wire gripper 70A is attached to the insulated electric wire 90 with the longitudinal direction of this groove aligned with the insulated electric wire 90. Hereinafter, the space between the fixed gripping portion 72 and the movable gripping portion 73 will be referred to as the gripping space, and the direction of the groove will be referred to as the electric wire direction. The electric wire direction corresponds to the left-right direction described above. The movable gripping portion 73 is provided with a restricting mechanism (not shown), so it is substantially unable to move in the electric wire direction relative to the main body 71.

[0044] The gripping space is open at either one side in the front-rear direction (the front side in this embodiment), and the insulated electric wire 90 can be inserted into or removed from the gripping space through this open portion.

[0045] The open-close cover 74 is a plate-shaped member. The open-close cover 74 is supported by the main body 71 so as to be rotatable in the vertical direction within a predetermined angular range. When the open-close cover 74 is positioned downward, the open portion of the gripping space is closed by the open-close cover 74. When the open-close cover 74 moves upward, the gripping space is opened. A biasing spring (not shown) is attached to the open-close cover 74. This biasing spring biases the open-close cover 74 in a direction that closes the gripping space (specifically, downward).

[0046] The lever portion 75 is a long, thin member attached to the lower portion of the movable gripping portion 73. The lever portion 75 is attached to the movable gripping portion 73 via a sliding mechanism (not shown) consisting of a groove. Therefore, the lever portion 75 is slidable in the wire direction relative to the movable gripping portion 73. The lever portion 75 extends from the main body portion 71 to one side generally along the wire direction. A first connecting portion 30 is attached to the end of this extended portion. The pair of wire grippers 70A, 70B are attached to the insulated wire 90 so that the first connecting portions 30 of each gripper face each other.

[0047] The screw shaft 76 is disposed so that its axis is oriented in the vertical direction, and is rotatably supported by the main body 71 .

[0048] The tapered portion 77 is a block-shaped member attached to the upper end of the screw shaft 76. The screw feed caused by the rotation of the screw shaft 76 allows the tapered portion 77 to move up and down relative to the main body 71. The tapered portion 77 cannot substantially move in the wire direction relative to the main body 71.

[0049] An inclined surface is formed on the upper surface of the tapered portion 77, which approaches the fixed-side grip portion 72 as it approaches the first connection portion 30. Correspondingly, an inclined surface that is substantially parallel to the inclined surface is formed on the lower surface of the lever portion 75. The lever portion 75 is disposed so as to rest on the tapered portion 77, so that the two inclined surfaces come into contact with each other.

[0050] When the first connection part 30 is pulled in a direction away from the main body part 71 along the wire direction, the lever part 75 rises due to the action of the inclined surface of the tapered part 77, and pushes up the movable grip part 73. This makes it possible to reduce the distance between the fixed grip part 72 and the movable grip part 73.

[0051] The grip lock operation part 78 is a ring-shaped member fixed to the lower end of the threaded shaft 76. The grip lock operation part 78 is configured to be rotatable. The grip lock operation part 78 can be operated, for example, by hooking an operating tool T1, the upper end of which is curved like a hook, onto the grip lock operation part 78. By rotating the threaded shaft 76 together with the grip lock operation part 78, the distance between the fixed grip part 72 and the movable grip part 73 can be increased or decreased.

[0052] When the pair of wire grippers 70A, 70B are connected via the stretcher 10 and the stretcher 10 is retracted, the lever portion 75 of each wire gripper 70A, 70B is pulled toward the center of the stretcher 10. Hereinafter, in the description of the wire grippers 70A, 70B, the side closer to the stretcher 10 may be referred to as the pulling side. The pulling side can also be referred to as the side where the first connection portion 30 is provided or the side closer to the stretcher 10.

[0053] As shown in Figures 2 and 3, the first connection part 30 includes a connection housing 31. The connection housing 31 is formed in a roughly rectangular parallelepiped block shape. A recess 32 is formed in the connection housing 31. The recess 32 is formed in a slit shape with a constant front-to-rear width. The recess 32 opens the upper and pulling side of the connection housing 31. A boss part 51 of the extender 10 can be inserted into the recess 32. The boss part 51 will be described later.

[0054] A guide groove 33 is formed on the inner wall of the recess 32. A pair of guide grooves 33 are arranged in the front-rear direction, sandwiching the recess 32 therebetween. A protrusion 52 of the extender 10 can be inserted into each guide groove 33. The protrusion 52 will be described later. Since the pair of guide grooves 33 have substantially the same shape, one of the guide grooves 33 will be described below as a representative.

[0055] 3, the guide groove 33 is formed as a zigzag groove. An upper end PE of the guide groove 33 forms an opening in the upper surface of the connection housing 31.

[0056] As shown in Figure 3, the guide groove 33 extends downward from its upper end PE to a fourth position P4, then extends toward the pulling side to a third position P3, then extends downward again to a second position P2, and then extends toward the pulling side again to a first position P1. The end of the guide groove 33 farthest from the open portion of the upper end PE is the first position P1. A short path parallel to the wire direction connecting the first position P1 and the second position P2 is located at the lower end of the guide groove 33. The third position P3 and the fourth position P4 are higher than the first position P1 and the second position P2 and lower than the upper end PE of the guide groove 33.

[0057] The guide groove 33 is bent at each of the second position P2, the third position P3, and the fourth position P4. When the convex portion 52 is inserted in the guide groove 33, the guide groove 33 guides the convex portion 52 to move along the path that bends multiple times as described above.

[0058] The lower end of the guide groove 33, which includes the first position P1 and the second position P2, is connected to a window that opens to the outside of the connection housing 31. Therefore, the position of the protrusion 52 that has entered the guide groove 33 can be confirmed from the outside through the window.

[0059] 2 and 3, a through hole 34 extending in the vertical direction is formed in the bottom of the connection housing 31. The through hole 34 is formed to connect the inner bottom surface of the recess 32 and the bottom surface of the connection housing 31.

[0060] The upper end of a cylindrical guide tube 35 is fixed to the through-hole 34. The guide tube 35 is arranged so that its axial direction is the up-down direction. The internal space of the guide tube 35 is open at both the upper and lower ends of the guide tube 35. The internal space of the guide tube 35 is connected to the internal space of the recess 32.

[0061] A lock slider (lock member) 36 is disposed inside the guide cylinder 35. The lock slider 36 is a linear, elongated, cylindrical component. The lock slider 36 is disposed so that its longitudinal direction is the up-down direction.

[0062] The lock slider 36 is supported by the guide cylinder 35 so as to be slidable in the vertical direction, and can rotate about an axis in the vertical direction.

[0063] The lock slider 36 is formed in a stepped shape with a large diameter portion and a small diameter portion. The lock slider 36 is arranged so that the large diameter portion is on the upper side and the small diameter portion is on the lower side. A spring receiving portion 37 that protrudes toward the center is formed on the inner wall of the lower end of the guide tube 35.

[0064] A biasing spring (biasing member) 38 is disposed in the internal space of the guide tube 35. The biasing spring 38 is configured as a coil spring, and the small diameter portion of the lock slider 36 is inserted into the biasing spring 38. The biasing spring 38 is disposed between the spring receiving portion 37 and the large diameter portion of the lock slider 36. The biasing spring 38 biases the lock slider 36 upward by its elastic force.

[0065] The lower end of the lock slider 36 protrudes downward from the lower end of the guide tube 35. An operation ring (operation member) 39 is fixed to the lower end of the lock slider 36. The operation ring 39 is disposed at a position lower than the lower end of the guide groove 33, specifically below the connection housing 31.

[0066] An elastic force from the biasing spring 38 acts on the operating ring 39 through the lock slider 36. Therefore, when no operating force is applied to the operating ring 39, the operating ring 39 remains stationary with its upper surface in contact with the lower surface of the guide cylinder 35, as shown in Figure 3. At this time, the lock slider 36 protrudes upward by an appropriate length from the inner bottom surface of the recess 32, as shown in Figure 2. Hereinafter, the position of the lock slider 36 at this time may be referred to as the lock position LP1.

[0067] 6, an operator can lower the lock slider 36 by hooking an operating tool T1 onto the operating ring 39 and pulling it down. The position where the lock slider 36 is retracted downward and the protrusion length into the recess 32 is zero or sufficiently short may be referred to as the unlocked position LP2.

[0068] As shown in FIG. 3 , the lower end of a cylindrical retaining tube (retaining member) 40 is fixed to the top of the operating ring 39. The retaining tube 40 is arranged so that its axial direction is in the vertical direction. The retaining tube 40 is arranged outside the guide tube 35. The retaining tube 40, lock slider 36, and guide tube 35 are arranged so that their respective central axes coincide. Because the retaining tube 40 is fixed to the operating ring 39, when the lock slider 36 and operating ring 39 move in the vertical direction, the retaining tube 40 also moves integrally. Similarly, when the lock slider 36 and operating ring 39 rotate around their vertical axes, the retaining tube 40 also rotates integrally.

[0069] A pair of elongated movement grooves 41 are formed in the inner peripheral surface of the retaining cylinder 40 in the vertical direction. Each movement groove 41 is open toward the center of the retaining cylinder 40. The pair of movement grooves 41 are arranged symmetrically on either side of the center of the retaining cylinder 40. The upper end of each movement groove 41 is open upward.

[0070] A pair of stopper pins (regulating protrusions) 42 are formed on the outer peripheral surface of the guide tube 35. Each stopper pin 42 protrudes radially outward. The pair of stopper pins 42 correspond to the movement grooves 41 and are arranged symmetrically across the center of the guide tube 35. Each stopper pin 42 can enter and exit the movement groove 41.

[0071] The retaining cylinder 40 and the stopper pin 42 constitute a retaining mechanism 43 that retains the lock slider 36 at the unlocked position LP2.

[0072] When the operating ring 39 is rotated around the vertical axis, the guide cylinder 35 also rotates in the same manner, changing the phase of the moving groove 41. This makes it possible to switch between a state in which the phase of the stopper pin 42 matches the phase of the moving groove 41 and a state in which it does not match.

[0073] When the movable groove 41 is aligned with the phase of the stopper pin 42, the stopper pin 42 can move up and down within the movable groove 41 relative to the movable ring 39, as shown in Figures 2 and 3. Therefore, the operating ring 39 and the lock slider 36 can move up and down. When the operating ring 39 is pulled down by a sufficient stroke against the elastic force of the biasing spring 38, the lock slider 36 moves to the unlocked position LP2, and at the same time, the stopper pin 42 moves relatively upward out of the movable groove 41. In this state, the retaining cylinder 40 can be rotated together with the operating ring 39.

[0074] When the moving groove 41 is out of phase with the stopper pin 42, the stopper pin 42 is in contact with the upper end surface of the retaining cylinder 40 as shown in Figure 7, for example, and therefore the retaining cylinder 40 cannot move upward. Therefore, regardless of the elastic force of the biasing spring 38, the lock slider 36 is held at the unlocked position LP2 shown in Figure 7.

[0075] As shown in FIG. 1 , the extender 10 includes a rod portion 11 , an extension / retraction operating portion 12 , and an electric wire support portion 13 .

[0076] The rod portion 11 is a linear, elongated rod-like member. The rod portion 11 is provided with an extension mechanism (not shown). The extension mechanism can be realized by, for example, a known screw mechanism, but is not limited to this.

[0077] The telescopic operation unit 12 is a ring-shaped member. The telescopic operation unit 12 is disposed midway along the length of the rod unit 11. The telescopic operation unit 12 is configured to be rotatable. By rotating the telescopic operation unit 12 in one direction using the operating tool T1, the rod unit 11 can be extended, and by rotating it in the opposite direction, the rod unit 11 can be retracted.

[0078] The wire support portion 13 is fixed at an appropriate position on the rod portion 11. A space is formed inside the wire support portion 13 so that the insulated wire 90 can pass through. The wire support portion 13 has an opening that allows the insulated wire 90 to be supported and removed. The opening of the wire support portion 13 is configured to be openable and closable, and when the opening is open, the insulated wire 90 can be inserted into and removed from the wire support portion 13. By closing the opening with the insulated wire 90 inserted into the wire support portion 13, the insulated wire 90 can be prevented from coming off. When the insulated wire 90 is cut near the center of the expander 10, the wire support portion 13 can support the cut wire so that it does not droop.

[0079] The drawings show an example in which the wire support part 13 is configured in a C-shape so that the front side is open. The angle of the wire support part 13 can be changed around the rod part 11. When inserting the convex part 52 of the stretcher 10 into the guide groove 33 of the wire gripper 70A, 70B, the wire support part 13 may come into contact with the insulated wire 90, hindering the movement of the stretcher 10 and making the work difficult. However, the connection work can be made easier by changing the angle of the wire support part 13 so that the wire support part 13 and the insulated wire 90 do not interfere with each other. After connection, the insulated wire 90 is placed inside the wire support part 13 and the open part is closed.

[0080] The shape of the wire support part 13 is arbitrary, and for example, it can be configured as a U-shape with an open top. In the case of a U-shaped wire support part 13, with the open part open, the expander 10 is lifted so that the insulated wire 90 enters the wire support part 13 from above, and in this state, the convex part 52 of the expander 10 can easily approach the guide groove 33 of the wire grippers 70A, 70B. After connection, with the insulated wire 90 housed inside the wire support part 13, the open part is closed.

[0081] A second connection portion 50 is provided on each end of the rod portion 11. One end of the rod portion 11 is connected to the wire gripper 70A on the same side via the second connection portion 50 and the first connection portion 30. The opposite end of the rod portion 11 is connected to the wire gripper 70B on the same side via the second connection portion 50 and the first connection portion 30. Because the pair of second connection portions 50 are configured substantially symmetrically, the configuration of the second connection portion 50 on the side connected to the wire gripper 70A will be described below as a representative.

[0082] As shown in FIGS. 2 and 3 , the second connection portion 50 includes a boss portion 51 and a protrusion portion 52 .

[0083] The boss portion 51 is provided at the longitudinal end of the rod portion 11. The boss portion 51 is formed in a plate shape and is disposed with its thickness direction facing the front-to-rear direction. The boss portion 51 protrudes further from the end of the rod portion 11 along the longitudinal direction of the rod portion 11. The boss portion 51 can be inserted into the recess 32 in the first connection portion 30.

[0084] The protrusions 52 are arranged in a pair in the front-to-rear direction, sandwiching the boss portion 51. The protrusion 52 on one side protrudes forward from the boss portion 51, and the protrusion 52 on the other side protrudes rearward from the boss portion 51. Each protrusion 52 is formed in a cylindrical shape. The central axes of the two protrusions 52 are aligned. The pair of protrusions 52 can be inserted into the pair of guide grooves 33 in the first connecting portion 30.

[0085] The boss 51 has an end surface 53 in the protruding direction formed in an arc shape. The center of the arc of the end surface 53 roughly coincides with the central axis of the protrusion 52.

[0086] Next, a description will be given of the connection and separation between the first connection part 30 and the second connection part 50. Here, the connection and separation between the stretcher 10 and the wire gripper 70A will be described as an example, but the connection and separation between the stretcher 10 and the wire gripper 70B is similar.

[0087] To connect the first connection part 30 and the second connection part 50, as shown in Fig. 3, the boss part 51 of the second connection part 50 is inserted from above into the recessed part 32 of the first connection part 30. At almost the same time, the protruding part 52 is inserted from above into the guide groove 33. In the state shown in Fig. 3, the elastic force of the biasing spring 38 keeps the lock slider 36 in the lock position LP1.

[0088] As described above, the lock slider 36 protrudes upward inside the recess 32. Therefore, the bottom surface of the boss 51 inserted into the recess 32 presses downward on the upper surface of the lock slider 36, as shown in Figure 4. This causes the lock slider 36 to slightly descend. Figure 4 shows the state in which the protrusion 52 has reached the fourth position P4 of the guide groove 33.

[0089] 4, the worker moves the extender 10 diagonally downward so as to move away from the wire gripper 70A. As a result, the protrusion 52 passes through the inside of the guide groove 33 to the third position P3 and then the second position P2, and finally moves to the first position P1. The state in which the movement of the protrusion 52 is completed is shown in FIG. 5.

[0090] As the convex portion 52 moves from the second position P2 to the first position P1 inside the guide groove 33, the boss portion 51, which moves integrally with the convex portion 52, no longer faces the lock slider 36 in the vertical direction. Since the boss portion 51 is released from pressing down on the lock slider 36, the lock slider 36 returns to its original lock position LP1 due to the elastic force of the biasing spring 38. This completes the connection between the first connecting portion 30 and the second connecting portion 50.

[0091] In the state shown in FIG. 5 where the connection is complete, the lock slider 36 is in the lock position LP1. Therefore, the movement of the protrusion 52 from the first position P1 to the second position P2 is impossible because the lock slider 36 contacts the end face 53, preventing the boss 51 from moving. In other words, the lock slider 36 and the biasing spring 38 function as a locking mechanism that prevents the protrusion 52 from coming out of the guide groove 33. This prevents the first connecting portion 30 and the second connecting portion 50 from accidentally separating. This mechanical locking is automatically performed when the protrusion 52 reaches the first position P1 of the guide groove 33. Therefore, no special operation by the operator is required for locking.

[0092] The protrusion 52 is cylindrical, while the end of the guide groove 33 corresponding to the first position P1 is arcuate. Therefore, when the protrusion 52 is in the first position P1, the boss 51 can rotate around the first position P1 relative to the connection housing 31. This means that the angle of the extender 10 can be adjusted up and down around the first position P1 relative to the wire gripper 70A. This allows the connection portion to move like a joint, facilitating various tasks using the live line sorting tool 100. The protruding end face 53 of the boss 51 is arcuate, as described above. Therefore, the lock slider 36 does not get caught when the boss 51 rotates.

[0093] The inner bottom surface of the recess 32 is formed with an inclined surface 44 that becomes lower as the recess 32 moves from the second position P2 toward the first position P1. This allows the angle of the extender 10 relative to the wire gripper 70A to be changed over a wider range. The angle changeable range is determined to include the angle of the extender 10 such that the side farther from the wire gripper 70A is lower, as shown in Figures 10 and 13 (described later). This further improves the operability of the live line sorting tool 100.

[0094] To separate the first connecting part 30 and the second connecting part 50 from the state shown in Fig. 5, the operator uses the operating tool T1 to pull down the operating ring 39 significantly, as shown in Fig. 6, and then rotates the operating ring 39 by, for example, 90°. This state is shown in Fig. 7. After that, even if the pulling down of the operating ring 39 is released, the holding mechanism 43 can hold the lock slider 36 at the unlocked position LP2.

[0095] The operator moves the extender 10 diagonally upward from the state shown in Figure 7 so as to approach the wire gripper 70A. Because the lock slider 36 is in the unlocked position LP2, the movement of the protrusion 52 from the first position P1 to the second position P2 is permitted. As a result, the protrusion 52 passes through the inside of the guide groove 33 in the order of the second position P2, the third position P3, and the fourth position P4, and finally comes out upward through the opening at the upper end PE. At almost the same time, the boss 51 also comes out upward from the recess 32.

[0096] This completes the separation between the first connection part 30 and the second connection part 50. Thereafter, in preparation for the next connection, the operator returns the rotation of the operating ring 39 to its original position, which causes the lock slider 36 to automatically return to the lock position LP1.

[0097] Next, an installation operation of the live line sorting tool 100 on the insulated electric wires 90 when performing construction work using the live line sorting tool 100 of this embodiment will be described.

[0098] First, as shown in FIG. 8 , an operator attaches one of the wire grippers 70A to the insulated wire 90 using an operating tool T2 with a gripping portion at its upper end. At this time, the extender 10 is not connected to the lever portion 75 of the wire gripper 70A. The grip lock operating portion 78 has been operated in advance to sufficiently widen the gripping space between the fixed gripper 72 and the movable gripper 73. A hole (not shown) is formed in the openable cover 74 of the wire gripper 70A. By holding this hole with the gripping portion of the operating tool T2, the wire gripper 70A is suspended from the upper end of the operating tool T2 via the openable cover 74.

[0099] As described above, the openable cover 74 is fitted with a biasing spring. However, in the state shown in FIG. 8 where the wire gripper 70A is suspended from the upper end of the operating tool T2 via the openable cover 74, the gravity acting on the main body 71, fixed gripping portion 72, movable gripping portion 73, etc. exceeds the elastic force of the biasing spring. Therefore, the openable cover 74 rotates upward relatively, opening the gripping space. This allows the insulated wire 90 to be inserted into the gripping space.

[0100] By removing the operating tool T2 from the openable cover 74 with the insulated electric wire 90 in the gripping space, the wire gripper 70A is suspended from the insulated electric wire 90 as shown in Figure 9. At the same time that the suspension by the operating tool T2 is released, the openable cover 74 rotates downward due to the action of the biasing spring, closing the open portion of the gripping space. This prevents the wire gripper 70A from accidentally coming off the insulated electric wire 90.

[0101] Next, the worker lifts the telescopic device 10 using the operating tool T3 with a gripping portion at its upper end, as shown in Figure 10. The telescopic operating portion 12 of the telescopic device 10 has been operated in advance so that the rod portion 11 is fully extended. Next, as shown by the bold arrow in Figure 10, the worker moves the telescopic device 10 to connect the second connection portion 50 of the telescopic device 10 to the first connection portion 30 of the wire gripping device 70A. The connection method has already been explained using Figures 3 to 5. Once the connection is complete, the locking slider 36 automatically locks the telescopic device 10 and the wire gripping device 70A, preventing accidental separation.

[0102] Next, the worker attaches the opposite wire gripper 70B to the insulated wire 90. After that, as shown by the bold arrow in Figure 11, the worker uses the operating tool T3 to connect the second connection part 50 of the stretcher 10 to the first connection part 30 of the wire gripper 70B. These operations are the same as those for the wire gripper 70A, so explanations will be omitted. Next, the wire support part 13 of the stretcher 10 is attached to the insulated wire 90.

[0103] The state shown in FIG. 1 is thus achieved. The operator then operates the telescopic operating unit 12 of the telescopic device 10 to retract the rod 11. As a result, the lever 75 of each wire gripper 70A, 70B moves toward the opposite wire gripper 70B, 70A. The tapered portion 77 acts to raise the movable gripper 73 toward the fixed gripper 72. This allows the fixed gripper 72 and the movable gripper 73 to grip the insulated electric wire 90. Further retracting the rod 11 slackens the insulated electric wire 90 between the two wire grippers 70A, 70B, making it suitable for cutting and other operations. After the rod 11 is fully retracted, the operator operates the grip lock operating unit 78 of each wire gripper 70A, 70B to rotate the screw shaft 76. As a result, the tapered portion 77, which rises due to the screw feed, pushes up the movable gripping portion 73 via the lever portion 75, thereby clamping the insulated electric wire 90. In this way, the wire grippers 70A and 70B can be locked in the gripping state.

[0104] When the rod portion 11 of the extender 10 is retracted, a force is applied to the above-mentioned convex portion 52 in the direction opposite to the direction that moves the convex portion 52 from the first position P1 to the second position P2 in the guide groove 33. Therefore, it is possible to reliably prevent the first connecting portion 30 and the second connecting portion 50 from being accidentally separated.

[0105] Next, the removal of tools after the work is completed will be described.

[0106] After completing the installation, the worker removes the wire support part 13 from the insulated wire 90. Next, the worker operates the extension / retraction operating part 12 of the extension device 10 to extend the rod part 11 to its original length. Next, the worker pulls down and rotates the operating ring 39 provided on the wire gripper 70B, as shown in Figure 12. This holds the lock slider 36 of the wire gripper 70B in the unlocked position LP2, as already explained using Figure 7.

[0107] Next, as shown by the thick arrow in Fig. 12, the worker uses the operating tool T3 to move the stretcher 10 and separate the second connection part 50 from the first connection part 30 provided on the wire gripper 70B. The separation method has already been described using Fig. 7.

[0108] 13, the worker moves the extender 10 using the operating tool T3 to separate the second connection part 50 from the first connection part 30 of the wire gripper 70A. The separation method is the same as described above.

[0109] The extender 10, once separated from the two wire grippers 70A, 70B, can be lowered and retrieved. Because the weight the worker has to support is only the extender 10, physical strain can be reduced. The worker then operates the grip lock operating unit 78 of the wire gripper 70A to unlock the gripped state. Because the tension on the lever unit 75 by the extender 10 has already been released, the grip of the insulated electric wire 90 by the wire gripper 70A is also released at the same time as the lock on the gripped state is released. Next, the worker uses the operating tool T2 to hang the wire gripper 70A (via the openable cover 74) to detach it from the insulated electric wire 90, and then lower it for recovery. The wire gripper 70B can also be recovered by performing a similar procedure.

[0110] The wire grippers 70A, 70B and the extender 10 may be made of any material, but from the perspective of reducing weight, it is preferable that at least a portion of at least one of the wire grippers 70A, 70B and the extender 10 be made of a magnesium alloy. With regard to the wire grippers 70A, 70B, for example, the main body 71, fixed-side grip 72, movable-side grip 73, lever 75 (including the first connection portion 30), etc. may be made of a magnesium alloy. With regard to the extender 10, for example, the second connection portion 50, etc. may be made of a magnesium alloy.

[0111] As described above, the live line sorting tool 100 of this embodiment includes the extender 10 and the wire grippers 70A and 70B. The extender 10 is extendable. The wire grippers 70A and 70B can grip the insulated electric wire 90. The wire grippers 70A and 70B include the first connection part 30. The extender 10 includes the second connection part 50. The first connection part 30 includes a guide groove 33, a lock slider 36, and an operating ring 39. The upper end PE of the guide groove 33 is open. The lock slider 36 locks the first connection part 30 and the second connection part 50 in a connected state. The operating ring 39 is operated to release the lock provided by the lock slider 36. The second connection part 50 includes a protrusion 52 that is movable along the guide groove 33. The protrusion 52 is movable within the guide groove 33 in a direction along the insulated wire 90 between a first position P1 and a second position P2. Both the first position P1 and the second position P2 are lower than the upper end PE of the guide groove 33. The guide groove 33 is formed so that the first position P1 is connected to the upper end PE via the second position P2. When the first connection portion 30 and the second connection portion 50 are connected, the protrusion 52 is in the first position P1. The lock slider 36 prevents the protrusion 52 from moving from the first position P1 to the second position P2.

[0112] This allows the first connection portion 30 and the second connection portion 50 to be separated when attaching or detaching the live line sorting tool 100 to or from the insulated electric wire 90, thereby reducing the weight supported by the operator and easing the physical burden. Once the first connection portion 30 and the second connection portion 50 are connected, the lock slider 36 locks them, preventing unintended separation. Once connected, the protrusion 52 cannot be removed from the upper end PE of the guide groove 33 unless it moves horizontally from the first position P1 to the second position P2. The lock slider 36 is configured to prevent the protrusion 52 from moving from the first position P1 to the second position P2. Therefore, compared to a configuration in which the upper end PE of the guide groove 33 is locked by some kind of member, it is easy to arrange the locking member below the first connection portion 30. This makes it easy to realize a layout that allows the lock to be released without raising the operating tool T1 too high. Since there is no need to operate the vicinity of the upper end PE of the guide groove 33 with the operating tool T1, the operating tool T1 is unlikely to get in the way of the convex part 52 trying to come out upward from the upper end PE of the guide groove 33, and the separation work is smooth.

[0113] In the live line sorting tool 100 of this embodiment, the lock slider 36 is movable between a locked position LP1 and an unlocked position LP2 that is lower than the locked position. The first connection part 30 includes a biasing spring 38 that biases the lock slider 36 toward the locked position LP1. When the lock slider 36 is in the locked position LP1, the protrusion 52 is prevented from moving from the first position P1 to the second position P2. When the lock slider 36 is in the unlocked position LP2, the protrusion 52 is allowed to move from the first position P1 to the second position P2.

[0114] This allows the lock slider 36 to be easily switched between the locked state and the unlocked state by moving the lock slider 36.

[0115] In the live line sorting tool 100 of this embodiment, the lock slider 36 slides up and down between a lock position LP1 and an unlock position LP2.

[0116] This simplifies the configuration for moving the lock slider 36 .

[0117] In the live line sorting tool 100 of this embodiment, the operation ring 39 is disposed at a position lower than the lower end of the guide groove 33 .

[0118] This allows the lock to be released by operating the operating ring 39 at a low position, improving operability.

[0119] In the live line sorting tool 100 of this embodiment, the guide groove 33 is bent at each of the third position P3 and the fourth position P4 between the second position P2 and the upper end PE.

[0120] As a result, the convex portion 52 at the first position P1 of the guide groove 33 cannot come out of the upper end PE of the guide groove 33 unless it passes through the complexly shaped guide groove 33. Therefore, it is possible to reliably prevent the first connecting portion 30 and the second connecting portion 50 from being accidentally separated.

[0121] In the live line sorting tool 100 of this embodiment, when the convex portion 52 is in the first position P1, the extender 10 can rotate up and down around the first position P1 relative to the wire gripper (e.g., wire gripper 70A) to which it is connected.

[0122] As a result, the connection portion can move like a joint while the first connection portion 30 and the second connection portion 50 are connected to each other, thereby improving the operability of the live line sorting tool 100.

[0123] In the live line sorting tool 100 of this embodiment, the first connection part 30 has a recess 32 with an open upper end. The second connection part 50 has a boss part 51 that can be inserted into the recess 32. The protrusion part 52 moves integrally with the boss part 51. The lock slider 36 protrudes into the recess 32 at the lock position LP1. When the lock slider 36 is in the lock position LP1, the protrusion part of the lock slider 36 that protrudes into the recess 32 comes into contact with the boss part 51, thereby preventing the protrusion part 52 from moving from the first position P1 to the second position P2.

[0124] This makes it possible to reduce the size of the first connecting portion 30. Furthermore, since the lock slider 36 is configured to protrude into the recess 32, the lock slider 36 can be protected from external impacts.

[0125] In the live line sorting tool 100 of this embodiment, when a force is applied in a direction to move the expander 10 away from the wire gripper 70A while the first connection portion 30 and the second connection portion 50 are connected, a force is applied to the convex portion 52 in the opposite direction to the direction that moves the convex portion 52 relatively from the first position P1 to the second position P2.

[0126] This allows the force generated by contracting the extender 10 to be used to hold the protrusion 52 at the first position P1, thereby reliably preventing unintentional separation of the first connecting part 30 and the second connecting part 50.

[0127] The live line sorting tool 100 of this embodiment includes a holding mechanism 43 that holds the lock slider 36 at the unlocked position LP2.

[0128] This allows the unlocked state to continue without continuing to apply an operating force to the operating ring 39. This makes it easier to separate the first connecting part 30 and the second connecting part 50.

[0129] In the live line sorting tool 100 of this embodiment, the holding mechanism includes a stopper pin 42 and a vertical movement groove 41. The lock slider 36 moves vertically integrally with the movement groove 41. When the phase of the stopper pin 42 and the phase of the movement groove 41 match, the stopper pin 42 can move relatively vertically within the movement groove 41. By rotating the operating ring 39, it is possible to switch between a state in which the phase of the stopper pin 42 and the phase of the movement groove 41 match and a state in which they do not match.

[0130] This allows the holding mechanism 43 to switch between holding the unlocked state and not holding it, by simply rotating the operating member.

[0131] In the live line sorting tool 100 of this embodiment, at least a portion of at least one of the wire grippers 70A, 70B and the expander 10 can be made of a magnesium alloy.

[0132] By using a magnesium alloy as the material for the wire grippers 70A, 70B or the extender 10, they become lighter than conventional ones, which further reduces the physical burden on the worker during work.

[0133] The preferred embodiment of the present invention has been described above, but the above configuration can be modified, for example, as follows. Each modification may be made alone, or multiple modifications may be made in any combination.

[0134] Instead of being zigzag, the guide groove 33 may be formed in an L-shape in which the second position P2 and the upper end PE are connected by a vertically linear portion. A further bending portion of the guide groove 33 may be provided between the fourth position P4 and the upper end PE.

[0135] As shown in the modified example of Fig. 14, the first connection part 30 may be provided on the stretcher 10, and the second connection part 50 may be provided on the wire gripper 70A. In this case, the first connection part 30 provided on the stretcher 10 is inserted from below into the second connection part 50 provided on the wire gripper 70A and connected.

[0136] 14, when the rod portion 11 of the extender 10 is retracted, a force is applied to the guide groove 33 in the direction opposite to the direction that relatively moves the convex portion 52 from the first position P1 to the second position P2. Therefore, it is possible to reliably prevent the first connecting portion 30 and the second connecting portion 50 from being accidentally separated.

[0137] In the holding mechanism 43, a stopper pin 42 that protrudes toward the center may be provided on the inner peripheral surface of the holding cylinder 40, and a movement groove 41 that opens the outer peripheral side may be provided in the guide cylinder 35.

[0138] The holding mechanism 43 may be omitted.

[0139] The above-described first connecting portion 30 and second connecting portion 50 may be applied to a connection structure between only one of the pair of wire grippers 70A, 70B and the stretcher 10.

[0140] The locking member may be moved between the locked and unlocked positions by rotating about an appropriate point.

[0141] The shape of the operation ring 39 can be changed as appropriate. For example, an arm-shaped operation member may be disposed instead of the operation ring 39.

[0142] The lock slider 36 in the locked position may contact the protrusion 52 instead of the boss portion 51, thereby preventing the protrusion 52 from moving from the first position P1 to the second position P2.

[0143] REFERENCE SIGNS LIST 10 extender 30 first connection part 32 recess 33 guide groove 36 lock slider (lock member) 38 biasing spring (biasing member) 39 operation ring (operation member) 40 holding cylinder (holding member) 41 moving groove 42 stopper pin (regulating convex part) 43 holding mechanism 50 second connection part 51 boss part 52 convex part 70A, 70B wire gripper 90 insulated electric wire (electric wire) 100 live line sorting tool P1 first position P2 second position LP1 locked position LP2 unlocked position PE upper end

Claims

1. A live line sorting tool comprising: an extendable extender; and a wire gripper capable of gripping an electric wire; one of the extender and the wire gripper having a first connection part and the other having a second connection part; the first connection part having: a guide groove with an open upper end; a locking member that locks the first connection part and the second connection part in a connected state; and an operating member that is operated to release the locking by the locking member; the second connection part having a protrusion that is movable along the guide groove, the protrusion being movable within the guide groove in a direction along the electric wire between a first position that is lower than the upper end and a second position that is lower than the upper end; the guide groove being formed so that the first position is connected to the upper end via the second position; when the first connection part and the second connection part are connected, the protrusion is in the first position; and the locking member prevents the protrusion from moving from the first position to the second position.

2. A live line sorting tool as described in claim 1, wherein the locking member is movable between a locked position and an unlocked position lower than the locked position, the first connection part is provided with a biasing member that biases the locking member toward the locked position, and when the locking member is in the locked position, the movement of the convex part from the first position to the second position is prevented, and when the locking member is in the unlocked position, the movement of the convex part from the first position to the second position is permitted.

3. A live line sorting tool according to claim 2, wherein the locking member slides up and down between the locked position and the unlocked position.

4. A live line sorting tool according to claim 2, characterized in that the operating member is positioned lower than the lower end of the guide groove.

5. A live line sorting tool according to claim 1, characterized in that the guide groove is bent one or more times between the second position and the upper end.

6. A live line sorting tool as described in claim 1, characterized in that when the convex portion is in the first position, the expander is rotatable up and down around the first position relative to the wire gripper.

7. A live line sorting tool as described in claim 1, wherein the locking member is movable between a locked position and an unlocked position lower than the locked position, the first connecting portion has a recess with an open upper end, the second connecting portion has a boss portion that can be inserted into the recess, the convex portion moves integrally with the boss portion, the locking member protrudes into the recess in the locked position, and when the locking member is in the locked position, the protruding portion of the locking member into the recess comes into contact with the boss portion, thereby preventing movement of the convex portion from the first position to the second position.

8. A live line sorting tool as described in claim 1, characterized in that when a force is applied in a direction to move the expander away from the wire gripper while the first connection part and the second connection part are connected, a force is applied to the convex part or the guide groove in a direction opposite to the direction that moves the convex part relatively from the first position to the second position.

9. A live line sorting tool as described in claim 1, wherein the locking member is movable between a locked position and an unlocked position lower than the locked position, and the first connection part is provided with a holding mechanism that holds the locking member in the unlocked position.

10. A live line sorting tool as claimed in claim 9, wherein the locking member slides up and down between the locked position and the unlocked position, the holding mechanism comprises a regulating protrusion and a holding member having a vertical moving groove formed therein, and when the locking member is in the unlocked position, the locking member is capable of switching between a state in which the phase of the moving groove and the phase of the regulating protrusion match and a state in which they do not match as the operating member rotates, when the phase of the regulating protrusion and the phase of the moving groove match, the regulating protrusion can move relatively up and down inside the moving groove as the locking member moves up and down, and when the phase of the regulating protrusion and the phase of the moving groove do not match, the regulating protrusion comes into contact with the holding member, thereby holding the locking member in the unlocked position.

11. A live line sorting tool according to claim 1, characterized in that at least a portion of at least one of the wire gripper and the expander is made of a magnesium alloy.

12. A method for installing an electric wire for a live line sorting tool as described in claim 1, characterized in that the wire gripper, which is separated from the expander, is attached to the electric wire, and the first connection part provided on the wire gripper, which is attached to the electric wire, is connected to the second connection part provided on the expander.

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