JP4953133B2 - Grounding tool - Google Patents

Description

  The present invention relates to a grounding tool for grounding when a jumper wire is opened. In particular, the present invention relates to a grounding tool that can securely hold a conductive member.

  An overhead power transmission line normally transmits power through two lines. When carrying out the construction and maintenance work of this overhead power transmission line, power transmission on the working line is stopped to prevent an electric shock accident of the worker. At that time, power is transmitted as usual in the line where the work is not performed, and an induced current flows through the line where the work is performed along with the power transmission. Therefore, before the work, it is necessary to ground the work line to a steel tower or the like to release the current and ensure the safety of the worker.

  Specifically, the grounding is performed by connecting an earth wire (ground wire) to the overhead power transmission line itself or a grounded metal fitting attached to the electric wire. A tool used for this grounding work is a grounding tool. As a grounding tool, the thing of patent document 1 is mentioned, for example.

  As a grounding tool, two types of grounding tools, a hook type and a tulip type, are known depending on the shape of a portion that holds an electric wire or a grounded metal fitting. FIG. 12 is a schematic configuration diagram of a hook-type grounding tool. The grounding tool 4 includes an extendable insulating rod 401, a fixed grip piece 402 provided at the tip of the insulating rod 401, a movable grip piece 403 configured to be openable and closable with respect to the fixed grip piece 402, and a fixed grip piece. An earth-side metal fitting 405 connected to 402 via a ground wire 404 is provided. Between the fixed grip piece 402 and the movable grip piece 403, while holding the conductive member 9 (electric wire or grounded metal fitting) that is the object to be grasped, the ground side metal fitting is connected to the grounded object such as a steel tower, so that The current can be released from the member 9 via the fixed grip piece 402, the ground wire 404 connected to the fixed grip piece 402, and the ground side metal fitting 405. In addition, a bolt shaft 406 configured to be movable forward and backward in the longitudinal direction of the insulating rod 401 by rotating the insulating rod 401 is provided inside the fixed gripping piece 402. When the bolt shaft 406 advances, the pressure receiving portion 407 of the movable gripping piece 403 is pressed to rotate the movable gripping piece 403 in the closing direction with respect to the fixed gripping piece 402, thereby tightening the conductive member 9. By this tightening, the conductive member 9 is firmly held by the grounding tool 4, and the conductive member 9 is prevented from being detached from the grounding tool 4 during work.

  On the other hand, FIG. 13 is a schematic configuration diagram of a tulip-shaped grounding tool 5. Similarly to the hook type, this grounding tool 5 is also an extendable insulating rod 501, a fixed holding piece 502 provided at the tip of the insulating rod 501, and a movable holding piece configured to be openable and closable with respect to the fixed holding piece 502. 503 and a ground side metal fitting 505 connected to the fixed gripping piece 502 via a grounding wire 504. Between the fixed grip piece 502 and the movable grip piece 503, the conductive member 9 (electric wire or grounded metal fitting) that is the object to be grasped and the ground side metal fitting is connected to the grounded object such as a steel tower, thereby conducting The current can be released from the member 9 through the fixed grip piece 502, the ground wire 504 connected to the fixed grip piece 502, and the ground side metal fitting 505. The grounding tool 5 is also provided with a bolt shaft 506 configured to be movable forward and backward in the longitudinal direction of the insulating rod 501 by rotating the insulating rod 501 inside the fixed gripping piece 502. When the bolt shaft 506 advances, the pressure receiving portion 507 of the movable gripping piece 503 is pressed to move the movable gripping piece 503 in the closing direction with respect to the fixed gripping piece 502, and the conductive member 9 is tightened.

JP 2000-278830 A

  However, even when the hook-type or tulip-type grounding tool described above is used, there is a risk that the operator may be electrocuted by removing the conductive member from the grounding tool during the work.

  This is a mechanism that suppresses the opening of both gripping pieces in a state where the conductive member is not gripped at an appropriate position between the fixed gripping piece and the movable gripping piece (in the above-mentioned patent document, it consists of a bolt shaft and a pressure receiving portion). The main reason is that the tightening mechanism was activated. Thus, in a state where the conductive member is not gripped at the proper position of the gripping mechanism, that is, in a so-called half bite state, even if the release restraining mechanism of both gripping pieces is operated, the conductive member is detached from the gripping piece due to vibration during operation. There is a risk that.

  The present invention has been made in view of the above circumstances, and its main purpose is to reliably hold the conductive member to be gripped at an appropriate position of the gripping mechanism, and to ensure grounding of the overhead power transmission line during work. It is in providing the earthing | grounding tool which can be performed to.

  The present invention achieves the above-mentioned object by configuring the mechanism to suppress the opening of both gripping pieces for the first time when the gripping target is gripped at an appropriate position between the pair of gripping pieces. .

  The present invention is a grounding tool that grips a conductive member and releases current flowing through the conductive member to ground, and is characterized by including an insulating rod, a gripping mechanism, an opening suppression mechanism, and a lock mechanism.

  The insulating rod is a member that is actually gripped when the operator operates the grounding tool. In addition, the insulating rod is generally configured to be extendable and contractible, and the gripping mechanism can grip the conductive member located far from the operator.

  The gripping mechanism is a mechanism that has a pair of gripping pieces that are rotatably provided at the tip of the insulating rod and grip the conductive member. When the conductive member is gripped by such a gripping mechanism, the gripping mechanism is fixed to the conductive member, so that the insulating rod can be rotated with respect to the gripping mechanism in a state of gripping the conductive member. The configuration of the gripping mechanism includes a configuration having a fixed gripping piece connected to the tip of the insulating rod and a movable gripping piece that is rotatably supported via a first shaft portion provided on the fixed gripping piece. . According to such a configuration, the movable holding piece can be opened and closed with respect to the fixed holding piece, and the conductive member can be held between the fixed holding piece and the movable holding piece.

  The opening suppression mechanism is a mechanism that prevents the gripping mechanism from being released from a state in which the conductive member is gripped at an appropriate position of the gripping mechanism by utilizing the rotation of the insulating rod. That is, the opening suppression mechanism is a mechanism that operates by the rotation of the insulating rod and prevents the gripping mechanism from being detached from the conductive member. As the structure of the opening suppression mechanism, a rotating part that is fixed to the insulating rod and rotates with respect to the gripping mechanism by rotating the insulating rod, and a movable gripping piece that is operated by the rotation of the rotating part to release the gripping mechanism. The structure which has a suppression mechanism part which suppresses that it rotates is mentioned.

  The lock mechanism restricts the operation of the opening suppression mechanism when the conductive member is not gripped at the proper position of the gripping mechanism, and can only operate the opening suppression mechanism when the conductive member is disposed at the proper position of the gripping mechanism. It is a mechanism that makes it possible. Specifically, the lock mechanism includes a lock mechanism main body that is swingably supported with respect to the gripping mechanism, and the lock mechanism main body has a gripping mechanism when the conductive member is not gripped at an appropriate position of the gripping mechanism. And the insulating rod are engaged to regulate relative rotation of the insulating rod and the gripping mechanism. The lock mechanism main body allows the relative rotation between the insulating rod and the gripping mechanism by releasing the engagement between the gripping mechanism and the insulating rod when the conductive member is gripped at an appropriate position of the gripping mechanism. That is, the lock mechanism body is a member that adjusts the engagement / disengagement between the insulating rod and the gripping mechanism in accordance with the gripping state of the conductive member in the gripping mechanism. At this time, for example, the lock mechanism main body supported by the gripping mechanism may be engaged with a part of the insulating rod, or another member interlocked with the lock mechanism main body may be engaged with a part of the insulating rod. You may do it.

  As a configuration of the lock mechanism corresponding to the opening suppression mechanism including the rotation unit and the suppression mechanism unit, the lock mechanism main body and a conductive member that is a part of the lock mechanism main body and is gripped by the gripping mechanism are pressed. The structure which has a receiving part and the rotation prevention hole which prevents rotation of a rotation part by inserting a part of lock mechanism main body is mentioned. In the case of this configuration, the lock mechanism main body is rotatably supported via the second shaft portion provided on either the fixed gripping piece or the movable gripping piece. The lock mechanism main body is configured such that a part of the lock mechanism main body is inserted into or removed from the rotation prevention hole by rotating around the second shaft portion. According to such a configuration, when a part of the lock mechanism main body is inserted into the rotation prevention hole, the lock mechanism main body prevents the rotation of the rotating portion (that is, the rotation of the insulating rod), thereby preventing the opening suppression mechanism. Limit the behavior of

  In addition, the receiving portion which is a part of the lock mechanism main body is disposed between the fixed gripping piece and the movable gripping piece so as to come into contact with the conductive member when the gripping mechanism tries to grip the conductive member. By disposing the receiving portion at such a position, the conductive member can be gripped by the gripping mechanism, and the receiving portion can be pressed against the conductive member. When the receiving portion is pressed, the lock mechanism main body is also pressed, so that the lock mechanism main body rotates around the second shaft portion. The lock mechanism body is configured such that when the conductive member is gripped at an appropriate position of the gripping mechanism, all of the lock mechanism body is removed from the rotation prevention hole.

  By adopting the configuration of the present invention, it is possible to prevent the opening suppression mechanism from operating unless the conductive member is completely gripped at an appropriate position of the gripping mechanism of the grounding tool. That is, in the grounding tool of the present invention, the opening restraining mechanism does not operate in the half-engaged state, so that the conductive member can be reliably held.

  A specific configuration when the grounding tool described above is applied to both the hook type and the tulip type will be described.

[Hook type]
In the hook-type grounding tool, the first shaft portion is provided on the distal end side of the fixed gripping piece, and the opening formed by the fixed gripping piece and the movable gripping piece opens on the insulating rod side. Therefore, when gripping the conductive member using the hook mold, the conductive member is fitted into the gripping mechanism so as to be hooked. Here, it is preferable to provide a claw for hooking the conductive member and guiding the conductive member to the opening of the gripping mechanism at the tip of the movable gripping piece of the gripping mechanism. The conductive member hooked on the claw portion is guided to the opening portion along the outer shape of the movable gripping piece.

  Such an opening restraining mechanism of the hook-type grounding tool is typically configured as follows.

  First, the rotation part of the opening suppression mechanism is preferably constituted by a through shaft that is fixed to an insulating rod and penetrates the fixed gripping piece. The through shaft fixed to the insulating rod can be rotated with respect to the gripping mechanism. When the conductive member is gripped by the gripping mechanism, the gripping mechanism is fixed to the conductive member, and the insulating rod rotates. This is because the gripping mechanism does not rotate together.

  As described above, when the rotating portion is configured with a through shaft, the suppression mechanism portion of the opening suppression mechanism is provided in the protrusion provided on the outer periphery of the through shaft, the sliding groove with which the protrusion engages, and the movable gripping piece. In this case, the pressure receiving portion may have a surface that intersects the axis of the through shaft. Among the above configurations, the sliding groove is configured to advance the through shaft in the axial direction when the through shaft is rotated and the protrusion is moved along the sliding groove. For example, if the sliding groove is provided in a spiral shape, the rotating shaft can be sent out in the axial direction as the through shaft rotates.

  On the other hand, the pressure receiving portion of the suppression mechanism portion is a portion having a surface that intersects the axis of the penetrating shaft when the conductive member is disposed at an appropriate position of the gripping mechanism in the movable gripping piece. With such a configuration, when the penetrating shaft advances, rotation of the movable gripping piece that causes the conductive member to be detached from the gripping mechanism can be prevented by contact between the tip of the penetrating shaft and the pressure receiving portion. . Here, when the penetrating shaft is advanced, the tip of the penetrating shaft and the pressure receiving portion are not in contact with each other, and the movable gripping piece is allowed to rotate to such an extent that the conductive member gripped by the gripping mechanism does not come off. Anyway. However, if the penetrating shaft is advanced until the tip of the penetrating shaft comes into contact with the pressure receiving portion, it is possible to more effectively prevent the conductive member from being detached from the gripping mechanism. Furthermore, by extending the penetrating shaft, the tip of the penetrating shaft can press the pressure receiving portion, and the movable gripping piece can be rotated around the first shaft portion. At this time, since the pressure receiving portion is provided closer to the distal end side of the grounding tool than the first shaft portion, the movable gripping piece rotates in a direction to tighten the conductive member.

  The pressure receiving portion may have a configuration including an elastic member that presses the tip of the penetrating shaft. For example, as in Example 3 described later, when the conductive member is gripped by the gripping mechanism, the pressing piece biased by the compression spring may press the tip of the through shaft. In addition, it is good also as a structure which provides in a movable holding piece the leaf | plate spring which presses the front-end | tip of a penetration axis | shaft, when a conductive member is hold | gripped with a holding mechanism. Since the elastic body of the pressure receiving portion is provided on the movable gripping piece, the fact that the elastic body presses the tip of the penetrating shaft is equivalent to the tip of the penetrating shaft pressing the movable gripping piece via the elastic body. . Therefore, since the pressure receiving portion has an elastic body, the movable gripping piece can rotate around the first shaft portion to tighten the conductive member, and the elastic body adjusts the tightening force to an appropriate magnitude. The gripping mechanism is not damaged, and the gripped conductive member is not damaged.

  Here, the protrusion and the sliding groove only need to be able to advance and retract the through shaft when the protrusion moves along the sliding groove. For example, a thread groove may be cut in the through shaft and a through hole penetrating the through shaft, and the through shaft may be moved forward and backward by screwing. In this case, the thread of the through shaft is a projection, and the thread valley of the through hole is a sliding groove. In addition, as in the embodiments described later, the through-shaft is configured so as to be freely advanced and retracted by a so-called cam screw that moves a protrusion protruding in the radial direction of the through-shaft along a spiral groove (sliding groove) provided in the fixed gripping piece. May be. The cam groove is preferably formed so as to spirally extend from the proximal side to the distal end side of the grounding tool. Here, it is preferable to form a recess notched on the proximal side of the grounding tool at the terminal and intermediate portions of the cam groove. When the concave portion is formed in the terminal portion, the protrusion moved along the cam groove can be fitted into the concave portion of the terminal portion, and the advance position of the through shaft can be maintained. In addition, if a recess is formed in the intermediate portion, even if strong vibration is applied to the grounding tool and the protrusion is detached from the recess in the terminal portion, the intermediate portion will be removed when the protrusion slides along the cam groove. So that the cam groove does not return to the start end of the cam groove. The recessed portion of the intermediate portion can maintain the advance position of the penetrating shaft to the extent that the conductive member can be gripped, so that the conductive member can be prevented from being detached from the gripping mechanism.

  Furthermore, it is preferable that the operation state of the above-described opening suppression mechanism can be confirmed. Specifically, it is preferable to provide a protruding piece on each of the penetrating shaft and the fixed gripping piece so that the rotation state of the insulating rod can be visually confirmed. The rotational state of the insulating rod is grasped based on the positional relationship between these projecting pieces, for example, whether or not both projecting pieces are coincident or whether the positions of both projecting pieces are shifted. As a specific configuration of the projecting piece, a simple bar-shaped projection may be used, or one may be a bar-shaped projection and the other may be a plate-shaped projection as in Example 3 described later. If we compare the latter configuration, it is the relationship between the dial of the speedometer and the pointer.

  In addition, the lock mechanism of the hook-type grounding tool is configured as follows according to the configuration of the opening suppression mechanism already described.

  First, the rotation prevention hole of the lock mechanism is preferably provided at a position where a part of the lock mechanism main body can be inserted into the through shaft. For example, it is possible to provide a slit-like hole that penetrates the through-hole of the fixed gripping piece and to provide an anti-rotation slit into which the lock mechanism main body can be inserted on the penetration shaft itself. In this case, the rotation prevention slit is provided at a position corresponding to the slit-shaped hole when the conductive member is not disposed at an appropriate position. With such a configuration, when the conductive member is not gripped at the proper position of the gripping mechanism, a part of the lock mechanism main body can be inserted into the rotation prevention slit of the penetrating shaft. The rotation of the shaft can be prevented.

  In the above case, the second shaft portion that pivotally supports the lock mechanism main body is provided on the movable gripping piece. By providing the second shaft portion on the movable gripping piece, the lock mechanism main body can be disposed at the opening of the gripping mechanism. In this case, the intermediate part of the lock mechanism main body, the part facing the fixed gripping piece constitutes the receiving part, and the tip opposite to the second shaft part across the receiving part is the part inserted into the rotation prevention hole become.

  In the hook-type grounding tool having the above-described configuration, when the conductive member is held at an appropriate position between the fixed holding piece and the movable holding piece, the lock mechanism main body is pressed against the conductive member via the receiving portion. And the lock mechanism main body that has been rotated comes out of the rotation prevention hole, thereby allowing the penetration shaft to advance.

  In addition, the grounding tool has a grounding wire connected to the fixed gripping piece for releasing the current of the gripped conductive member to the grounding. The grounding wire is attached to the axis of the penetrating shaft. It is preferable to be formed so as to be inclined with respect to. With this configuration, the direction in which the grounding wire connected to the fixed gripping piece is pulled out is defined in a direction away from the through shaft. For example, the grounding wire extending from the fixed gripping piece is released from the opening of the gripping mechanism. If a protrusion for grasping the rotation state of the above-described insulating rod is provided, it can be escaped so as not to overlap the portion where the protrusion is provided. That is, by defining the inclination of the mounting plane, the grounding wire can be prevented from interfering with the gripping / tightening operation of the conductive member.

[Tulip type]
In the tulip-type grounding tool, the first shaft portion is provided on the insulating rod side of the fixed grip piece, and the opening formed by the fixed grip piece and the movable grip piece opens on the distal end side of the fixed grip piece. Therefore, when the conductive member is gripped using the tulip shape, the conductive member is fitted into the gripping mechanism such that the tulip-shaped gripping mechanism is pressed against the conductive member. Here, it is preferable to provide a claw for hooking the conductive member and guiding the conductive member to the opening of the gripping mechanism at the tip of the fixed grip piece of the gripping mechanism. The conductive member hooked on the claw portion is guided to the opening portion along the outer shape of the fixed grip piece.

  Such an opening restraining mechanism for the tulip type grounding tool is typically configured as follows.

  First, the rotation part of the opening suppression mechanism is preferably formed of a rotating body that is provided at the tip of the insulating rod, that is, at the base of the fixed gripping piece and is rotatable with respect to the gripping mechanism by rotating the insulating rod. In this case, the rotating body is fixed to the insulating rod, but is rotatably supported by the fixed gripping piece. As the rotator, for example, a flat plate, particularly a disk, is suitable. The rotating body is provided with a slit and a guide groove that constitute the suppression mechanism section described below.

  The suppression mechanism portion of the opening suppression mechanism may be configured by a guide piece provided on the movable gripping piece, a slit provided on the rotating body, and a guide groove provided on the rotating body continuously with the slit.

  The guide piece is a rod-shaped member that extends to the insulating rod side of the first shaft portion among the movable gripping pieces. In the tulip-type grounding tool, the opening is on the tip side, and the above-described rotating part (rotating body) is provided on the tip side of the insulating rod and on the base side of the gripping mechanism. Therefore, the guide piece that extends to the insulating rod side from the first shaft portion extends to the rotating body side.

  The slit is a portion provided in the rotating body and into which the guide piece is inserted. Here, since the guide piece is formed integrally with the movable gripping piece, it swings in the radial direction with respect to the center of rotation of the rotating body when the movable gripping piece rotates to grip the conductive member. At this time, since the movable gripping piece cannot be rotated unless the slit is provided to allow the guide piece to swing, the conductive member cannot be gripped by the gripping mechanism. Therefore, the slit is formed to extend in the radial direction with respect to the rotation center of the rotating body.

  Further, the guide groove is a portion extending in the circumferential direction with respect to the rotation center of the rotating body continuously from the slit. That is, when the rotating body is rotated, the guide piece moves from the slit position to the guide groove position. At this time, the edge of the guide groove serves as an abutment to restrict the swinging of the guide piece in the radial direction, so that the movable gripping piece can be prevented from rotating in the opening direction. For example, when the movable gripping piece rotates in the closing direction when the guide piece moves inward in the radial direction of the rotating body, the guide groove approaches the outer edge of the guide groove inward in the radial direction as the distance from the slit increases. Like that. By doing so, when the guide piece is moved along this guide groove, the guide piece can be moved inward in the radial direction and rotated in a direction to close the movable gripping piece. As a result, the conductive member gripped by the gripping mechanism can be tightened.

  Moreover, it is preferable to provide the rotating body with a marker indicating the proper arrangement position of the guide piece in the guide groove. For example, the marker may be formed by coloring or providing unevenness at a position near the end of the guide groove (the end of the guide groove opposite to the slit) of the rotating body.

  Further, it is preferable that the rotating body is provided with a wear-resistant member configured to be detachable from the rotating body so as to come into contact with the guide piece when the guide piece is disposed in the guide groove. With such a configuration, it is possible to reduce the damage of the guide groove due to the sliding contact of the guide piece, and if the wear-resistant member is damaged, it is economical because only this member needs to be replaced. The wear resistant member may be attached by being fitted in the guide groove, or may be attached by tightening two members that sandwich the rotating body from the thickness direction. Further, the wear-resistant member may be an elastic body that urges the guide piece in the direction in which the movable gripping piece closes, for example, a plate spring-like member, when the guide is disposed at an appropriate position of the guide groove.

  In addition, the lock mechanism of the tulip-type grounding tool is configured in conjunction with the opening suppression mechanism already described. A typical configuration is as follows.

  The lock mechanism main body of the lock mechanism is rotatably supported via the second shaft portion. Here, in the case of the tulip type, unlike the hook type, the rotating body is on the base side of the gripping mechanism. It is easy to arrange in the opening. In this case, the part arrange | positioned in the position of an opening part among lock mechanism main bodies comprises a receiving part.

  Of the lock mechanism main body, a portion extending to the rotating body can be prevented from rotating with respect to the gripping mechanism by being inserted into a rotation preventing hole provided in the rotating body described below. The rotation of the rotating body can be prevented because the lock mechanism main body is pivotally supported by the movable gripping piece or the fixed gripping piece via the second shaft portion, and the rotation direction of the lock mechanism main body deviates from the rotation direction of the rotating body. Because.

  The rotation prevention hole is provided at a position in the rotating body where the lock piece can be inserted. Of course, the anti-rotation hole is provided at a position in the rotating body that does not interfere with the slit and the guide groove.

  In the tulip-type grounding tool having the above-described configuration, when the conductive member is held at an appropriate position between the fixed holding piece and the movable holding piece, the lock mechanism main body is pressed by the conductive member via the receiving portion. , And the lock piece comes out of the rotation prevention hole, thereby allowing the rotation of the rotating body.

  According to the grounding tool of the present invention, it is possible to operate the opening suppression mechanism that prevents the holding mechanism from being opened only when the conductive member is securely held at the appropriate position of the holding mechanism. That is, since the opening restraining mechanism does not operate in the half-engaged state, the conductive member can be securely held, and the grounding of the conductive member is not released during work. Therefore, an electric shock accident during work can be almost certainly eliminated.

  Embodiments and modifications of the present invention will be described below with reference to the drawings.

<Example 1>
In Example 1, a hook-type grounding tool will be described. FIG. 1 is a schematic configuration diagram of a hook-type grounding tool. The hook-type grounding tool 1 includes an insulating rod 11, a gripping mechanism having a pair of gripping pieces that grip the conductive member, an opening suppression mechanism that suppresses opening of the gripping mechanism that grips the conductive member, and an opening suppression mechanism And a lock mechanism for restricting the operation. Although not shown in FIG. 1, a ground side metal fitting is connected to the gripping mechanism via a ground wire, as in the case of a conventional hook type grounding tool.

  The gripping mechanism includes a fixed gripping piece 12 and a movable gripping piece 13, and grips the conductive member between the gripping pieces 12 and 13. The release suppression mechanism includes a rotating portion (through shaft 14) and a suppression mechanism portion (projections 149, cam grooves (sliding grooves) 129, and pressure receiving portions 131), and suppresses the opening of the gripping mechanism. The lock mechanism includes a lock mechanism body 15 including a receiving portion 153 and a rotation prevention hole (slit-like hole 122 and rotation prevention slit 142), and the through shaft 14 is provided unless the conductive member is held at an appropriate position of the holding mechanism. Prevents rotation. Note that the opening suppression mechanism in the following embodiments and modifications not only suppresses the opening of the gripping mechanism but also has a function of tightening the conductive member by the gripping mechanism.

  As will be described in detail later, the hook-type grounding tool 1 having such a configuration has a lock mechanism body 15 that is provided with an anti-rotation hole (slit-shaped hole 122 and It is inserted into the anti-rotation slit 142) so that the through shaft 14 cannot be rotated, that is, the opening suppression mechanism cannot be operated. On the other hand, when the conductive member is gripped at an appropriate position of the gripping mechanism 1, the grounding tool 1 causes the lock mechanism main body 15 to be all removed from the rotation prevention hole (particularly, the rotation prevention slit 142) to operate the opening suppression mechanism. Can be done.

  Hereinafter, the constituent members of the hook-type grounding tool will be described, and the arrangement of the constituent members according to the gripping state of the conductive member and the gripping of the conductive member so as not to come off will be described.

[Insulating bar]
The insulating rod 11 is a part that an operator holds to operate the grounding tool 1 of the present invention. In FIG. 1, only a part on the tip side is shown, but the part not shown is configured to be stretchable by a known configuration described in Patent Document 1.

  A through-shaft 14 to be described later is fixed to the distal end side of the insulating rod 11, and the through-shaft 14 rotates as the insulating rod 11 rotates. The through shaft 14 is a member constituting a part of the opening suppression mechanism, and the fact that the through shaft 14 does not rotate means that the opening suppression mechanism does not operate.

[Fixed gripping piece]
As shown in FIG. 2 (A), the fixed gripping piece 12 has a cylindrical portion 12c and a gripping portion 12g provided so as to protrude in the radial direction of the cylindrical portion 12c. As shown in FIG. 11 is fixed to the tip.

  The cylindrical portion 12c is provided with a through hole 121 through which the through shaft is inserted. The cylindrical portion 12c is formed with a slit-like hole 122 that penetrates in the radial direction of the cylindrical portion 12c. Further, a spiral cam groove (sliding groove) 129 is provided on the base side of the cylinder portion 12c, and a seat cylinder 127 is provided inside the through hole 121 in the vicinity thereof. The seating surface cylinder 127 and the cam groove 129 serve as a part of a mechanism for advancing the through shaft 14 as will be described later.

  In addition, a connection pedestal 124 for screwing and connecting a grounding wire (not shown) and a grounding wire guide hole 125 for inserting the grounding wire and defining the direction of the grounding wire are provided outside the cylindrical portion 12c. .

  On the other hand, the gripping portion 12g is composed of two plate-like members having the same shape extending in the radial direction from the outer periphery of the cylindrical portion 12c (only one is shown in the drawing). The plate-like members are arranged so as to oppose each other on the back side and the near side of the paper, and a lock mechanism main body 15 described later can be arranged between the opposed plate-like members.

  The grip portion 12g is formed with a recess 123 in which the conductive member is disposed when the conductive member is securely gripped by the gripping mechanism. Further, the grip portion 12g is provided with a shaft hole 51a through which a first shaft portion that rotatably supports a movable grip piece 13 described later with respect to the fixed grip piece 12 can be passed.

[Movable gripping piece]
As shown in FIG. 2 (B), the movable gripping piece 13 has a gripping portion 13g and a connecting portion 13j. The gripping portion 13g is arranged so that two plate-like members having the same shape are opposed to each other on the back side and the front side of the paper (only one is shown in the drawing). The movable gripping piece 13 is configured by being connected by the connecting portion 13j. The spacing between the plate-like members constituting the gripping portion 13g of the movable gripping piece 13 is such that a part of the gripping portion 12g of the fixed gripping piece 12 can be accommodated between the plate-like members. (See Figure 1 and Figure 2 together).

  The grip portion 13g is formed with a recess 133 in which the conductive member is disposed when the conductive member is securely gripped by the gripping mechanism. The position when the conductive member is disposed between the concave portion 133 of the movable gripping piece 13 and the concave portion 123 of the fixed gripping piece 12 is an appropriate position. Further, the gripping portion 13g passes through a shaft hole 51b through which the first shaft portion 51 can be passed, and a second shaft portion 52 that rotatably supports a lock mechanism body 15 described later with respect to the movable gripping piece 13. A shaft hole 52b is provided.

  In the connecting portion 13j, a pressure receiving portion 131 having a surface that intersects with the axis of the through shaft when the conductive member is gripped is formed on the distal end side of the grounding tool. That is, when the pressure receiving portion 131 is pressed, the movable gripping piece 13 rotates counterclockwise on the paper surface of FIG. 1 so that the opening formed by the movable gripping piece 13 and the fixed gripping piece 12 closes. To do.

  In addition, a claw portion 135 is formed on the movable gripping piece 13 on the tip end side on the insulating rod 12 side so that the conductive member can be easily hooked when the conductive member is gripped. The conductive member caught by the claw 135 is guided to the opening along the edge of the movable gripping piece 13.

[Lock mechanism body]
As shown in FIG. 2C, the lock mechanism main body 15 is formed with a receiving portion 153 at an intermediate portion thereof that faces the fixed gripping piece 12. The receiving portion 153 is a concave portion constituted by a smooth curved portion so as not to damage the conductive member when contacting the conductive member.

  Further, the lock mechanism main body 15 is provided with a stopper 155 on the side opposite to the receiving portion 153. As will be described later, the stopper 155 is a portion that is stoppered to the first shaft portion 51 when the conductive member is fitted into the gripping mechanism. In addition, the lock mechanism main body 15 is provided with a shaft hole 52c through which the second shaft portion 52 can be passed.

[Penetration axis]
The through shaft 14 is a rod-like member that can be passed through the through hole 121 of the fixed gripping piece 12. The through shaft 14 is provided with an anti-rotation slit 142 at a position corresponding to the slit-like hole 122 when arranged in the through hole 121. The rotation prevention slit 142 is a rectangular hole that penetrates the through shaft 14 so as to be orthogonal to the axis of the through shaft 14. A tip side (left side in the drawing) of the rotation prevention slit 142 is a tip part 141.

  In addition, the through shaft 14 is provided with a flange seat 143 and a projection 149 that serve as a part of a mechanism for advancing the through shaft 14 as will be described later (see FIG. 2D).

  The constituent members described above are arranged as shown in FIG. 1 when the conductive member is not gripped by the gripping mechanism. Specifically, the through shaft 14 fixed to the tip of the insulating rod 11 is inserted into the through hole 121 of the fixed gripping piece 12. At this time, the protrusion 149 of the through shaft 14 is disposed at the position of the cam groove 129 of the fixed grip piece 12, and the rotation prevention slit 142 of the through shaft 14 is disposed at a position corresponding to the slit-like hole 122 of the fixed grip piece 12. A compression spring 14s is disposed on the inner periphery of the through hole 121 and on the outer periphery of the through shaft 14. One end of the compression spring 14s is in contact with the flange seat 143 of the through shaft 14, and the other end is in contact with the seat tube 127 of the fixed grip piece 12.

  The movable gripping piece 13 is rotatably supported on the fixed gripping piece 12 via the first shaft portion 51 so as to cover a part of the outer periphery of the fixed gripping piece 12. The movable gripping piece 13 closes the opening when rotated counterclockwise in the figure, and opens when rotated clockwise. Further, the position of the movable gripping piece 13 with respect to the fixed gripping piece 12 is held by the elasticity of the torsion spring 81 so that the opening is not opened unless the conductive member is fitted between the gripping pieces 12 and 13. . This is because one end of the torsion spring 81 is engaged with the fixed gripping piece 12, the other end is in contact with the movable gripping piece 13, and an intermediate portion of the torsion spring 81 is wound around the first shaft portion 51. Because it is. Note that the distal end portion 141 of the through shaft 14 is in a position where it does not contact the pressure receiving portion 131 even when the movable gripping piece 13 rotates.

  The lock mechanism body 15 is rotatably supported by the movable gripping piece 13 via the second shaft portion 52. The lock mechanism main body 15 maintains the positional relationship with the movable gripping piece 13 in FIG. 1 by the elasticity of the torsion spring 82, and does not rotate unless the receiving portion 153 is pressed by the conductive member. This is because one end portion of the torsion spring 82 is in contact with the lock mechanism main body 15, the other end portion is in contact with the movable gripping piece 13, and an intermediate portion of the torsion spring 82 is wound around the second shaft portion 52. Because. Since the positions of the lock mechanism main body 15 and the movable gripping piece 13 are maintained, a portion of the lock mechanism main body 15 that is located closer to the distal end side of the grounding tool 1 than the second shaft portion 52 is prevented from rotating. And 142).

  When gripping the conductive member using the hook-type grounding tool 1, first, the conductive member is guided to the opening so as to be hooked by the claw portion 135 of the movable gripping piece 13. The conductive member 9 guided to the opening is guided between the recess 123 of the fixed grip piece 12 and the recess 133 of the movable grip piece 13 so as to spread the opening (see FIG. 3A). ). Here, the state shown in FIG. 3A corresponds to one of so-called half biting states. In this half-engaged state, the lock mechanism main body 15 is in a state of being inserted into the rotation prevention hole 122 because the positional relationship with respect to the movable gripping piece 13 is maintained by the torsion spring 82. Therefore, the lock mechanism main body 15 inserted into the rotation prevention holes (122 and 142) cannot rotate the through shaft 14, that is, the opening suppression mechanism can be operated, and is gripped by the gripping pieces 12 and 13. The conductive member 9 cannot be tightened.

  When the conductive member 9 is further pushed into the opening of the gripping mechanism from the half-engaged state described above, the lock mechanism body 15 is pressed by the conductive member 9 via the receiving portion 153 and rotates counterclockwise in the figure. . Then, when the conductive member 9 is disposed at an appropriate position of the gripping mechanism (between the concave portion 123 and the concave portion 133), the lock mechanism main body 15 comes out of the rotation prevention slit 142 (see FIG. 3B). That is, the lock mechanism main body 15 is not inserted into the rotation prevention slit 142 of the through shaft 14 until this time, so that the through shaft 14 can be rotated. When the conductive member 9 is disposed at an appropriate position of the gripping mechanism, the stopper 155 of the lock mechanism main body 15 is disposed at a position where it substantially contacts the first shaft portion 51, and the movable gripping piece 13 is more than necessary. It is not open.

  Next, as shown in FIG. 3B, when the through shaft 14 is rotated in a state where the lock mechanism is released, the protrusion 149 provided on the outer periphery of the through shaft 14 is formed in the cam groove 129 of the fixed gripping piece 12. It moves spirally along, that is, the penetrating shaft 14 advances. Here, the feed of the penetrating shaft 14 is supported by the elasticity of the compression spring 14s in contact with the seat tube 127 fixed to the fixed gripping piece 12 and the flange seat 143 of the penetrating shaft 14. Axis 14 can be advanced. The advanced distal end portion 141 of the penetrating shaft 12 presses the pressure receiving portion 131 of the movable gripping piece 13 to rotate the movable gripping piece 13. Accordingly, the conductive member 9 disposed at the appropriate position of the gripping mechanism is tightened.

[Effect of hook type grounding tool of this example]
According to the hook-type grounding tool 1 of Example 1 having such a configuration, in the state where the gripping mechanism as shown in FIG. Since a part of the lock mechanism main body 15 is inserted into the rotation prevention slit 142, the through shaft 14 cannot be rotated. In other words, as shown in FIG. 3 (B), unless the conductive member 9 is gripped at an appropriate position, the lock mechanism main body 15 continues to be positioned in the rotation prevention slit 142 of the through shaft 14, so that the through shaft 14 is rotated. That is, the opening suppression mechanism cannot be operated. Therefore, the conductive member 9 is not tightened in the half-engaged state, and an electric shock accident of the operator can be prevented.

<Modification 1-1>
In this modification, a hook-type grounding tool having an opening suppression mechanism different from that in the first embodiment will be described with reference to FIG. Specifically, the grounding tool of this example differs in the shape of the cam groove. Since the configuration other than the cam groove is the same as that of the first embodiment, only the difference will be described here.

  FIG. 4A is a partial cross-sectional view showing the fixed gripping piece 12 in which the cam groove has a C-shape. The cam groove 129b includes a first horizontal groove 129b1, a vertical groove 129b2 continuous with the groove, and a second horizontal groove 129b3 continuous with the standing groove. In the case of such a cam groove 129b, when the conductive member 9 is not gripped by the gripping mechanism, the protrusion 149 of the through shaft 14 is stopped against the first lateral groove 129b1, so that the through shaft 14 advances in the longitudinal direction. I can't let you. In the grounding tool including the fixed grip piece 12 having the cam groove 129b, when the lock mechanism main body 15 is detached from the rotation prevention slit 142, the insulating rod 11 is rotated to rotate the through shaft 14, and the protrusion 149 is cammed. The through shaft 14 is advanced by bringing it to the position of the vertical groove 129b2 of the groove 129b and pushing out the insulating rod 11. The distal end portion 141 of the penetrating shaft 14 that has advanced advances to a position where it abuts on the pressure receiving portion 131. Then, again, the insulating rod 11 is rotated to place the protrusion 149 in the second lateral groove 129b3. By doing so, even if the pressure receiving portion 131 presses the distal end portion 141 of the through shaft 14 while the movable gripping piece 13 tries to rotate, the through shaft 14 has the projection 149 held against the edge of the second groove portion 129b3. Because it is fixed by, it does not retreat. Therefore, the conductive member held by the holding mechanism does not come off.

  In addition to the C-shaped cam groove, an S-shaped groove as shown in FIG. 4B may be used. Similar to the C-shaped cam groove, the S-shaped cam groove 129c includes a first lateral groove 129c1, a longitudinal groove 129c2, and a second lateral groove 129c3, and the conductive member 9 is not gripped at an appropriate position of the gripping mechanism. Sometimes, the protrusion 149 is stopped against the edge of the first lateral groove 129c1. When the lock mechanism main body 15 is removed from the rotation prevention slit 142, the protrusion 149 is moved through the vertical groove 129c2 and moved to the position of the second horizontal groove 129c3. By doing so, the distal end portion 141 of the penetrating shaft 14 that has been advanced can be fixed at a position where it abuts against the pressure receiving portion 131, and the conductive member gripped by the gripping mechanism can be prevented from being detached.

<Example 2>
In Example 2, a tulip-shaped grounding tool will be described. FIG. 5 is a schematic configuration diagram of a tulip-type grounding tool. Similar to the hook-type grounding tool, the tulip-type grounding tool 2 includes an insulating rod 21, a gripping mechanism, an opening suppression mechanism, and a lock mechanism. Although not shown in FIG. 5, as in the case of the conventional tulip-type grounding tool, a ground side metal fitting is connected to the gripping mechanism via a grounding wire.

  The gripping mechanism includes a fixed gripping piece 22 and a movable gripping piece 23. The opening suppression mechanism includes a rotating body 24 that constitutes a rotating portion, a guide piece 234 that constitutes a suppressing mechanism portion, a slit 241 provided in the rotating body 24, and a guide groove 242. The lock mechanism includes a lock mechanism main body 25 including a receiving portion 253 and a lock piece 255, and a rotation prevention hole 245 provided in the rotating body 24.

  In the tulip-type grounding tool 2 having such a configuration, the rotating body 24 cannot be rotated in a state where the lock piece 255 of the lock mechanism body 25 is inserted into the rotation prevention hole 245, as will be described in detail later. Therefore, the opening suppression mechanism does not operate. When the conductive member is gripped at an appropriate position of the gripping mechanism, the lock piece 255 is detached from the rotation prevention hole 245 so that the opening suppression mechanism can be operated.

  Hereinafter, the constituent members of the tulip-type grounding tool of this example will be described, and the arrangement of the constituent members according to the gripping state of the conductive member will hold the grounding tool so that the conductive member does not come off. Will be explained.

[Insulating bar]
The insulating bar 21 is a part that an operator holds to operate the grounding tool 2 of the present invention. In FIG. 5A, only a part on the tip end side is shown, but the part not shown is configured to be extendable and contractable as in the first embodiment.

  A rotating body 24, which will be described later, is fixed to the distal end side of the insulating rod 21 and at the base of the gripping mechanism. The rotating body 24 rotates as the insulating rod 21 rotates.

[Fixed gripping piece]
As shown in FIG. 6A, the fixed gripping piece 22 has a base portion 22b, a gripping portion 22g, and a connecting portion 22j.

  The base portion 22b includes a cylindrical portion 22c that passes through a bolt shaft for fixing the fixed grip piece 22 to the insulating rod 21, and a lock piece guide portion 22r having a lock piece guide hole 222 through which the lock piece 255 is inserted. The cylindrical portion 22c is a portion that is housed in a cylindrical portion 24c (see FIG. 6D) of the rotating body 24 described later, and fixes the fixed grip piece 22 to the insulating rod 21 via the rotating body 24. .

  The gripping portion 22g is arranged so that two plate-like members having the same shape face each other on the back side and the near side (only one is shown in the drawing), and the base portion 22b and the connecting portion 22j It is formed by connecting by. A space is formed between the two plate-like members, and a part of the movable gripping piece 23 can be stored in this space. The grip portion 22g is provided with a shaft hole 61a in which a first shaft portion 61 that rotatably supports the movable grip piece 23 can be disposed. The grip portion 22g has a recess 223 in which the conductive member is disposed when the conductive member is securely gripped by the gripping mechanism. In addition, the gripping portion 22g is provided with a torsion spring support portion 71 so as to connect two plate-like members.

  The connecting portion 22j is provided with a connection base 224 for connecting a grounding wire (not shown) and a grounding wire guide hole 225 for inserting the grounding wire and defining the drawing direction of the grounding wire. In addition, a claw portion 226 is formed at the tip of the connecting portion 22j so that the conductive member can be easily hooked when the conductive member is gripped. The conductive member hooked on the claw portion 226 is guided along the edge of the fixed gripping piece 22 to the opening of the gripping mechanism.

[Movable gripping piece]
As shown in FIG. 6 (B), the movable gripping piece 23 has a gripping portion 23g and a connecting portion 23j. Specifically, the movable gripping piece 23 includes a gripping portion 23g formed by arranging two plate-like members having the same shape so as to face each other on the back side and the near side (on the drawing). , Only one sheet is shown) and connected by a connecting portion 23j. The interval between the plate-like members constituting the holding portion 23g of the movable holding piece 23 is such that a part of the movable holding piece 23 can be accommodated between the plate-like members of the fixed holding piece 22.

  The grip portion 23g is formed with a recess 233 in which the conductive member is disposed when the conductive member is securely gripped by the gripping mechanism. The position when the conductive member is disposed between the concave portion 233 of the movable gripping piece 23 and the concave portion 223 of the fixed gripping piece 22 is an appropriate position.

  The connecting portion 23j is provided with a main body insertion hole 232 into which a lock mechanism main body 25 described later can be inserted. The main body insertion hole 232 allows the lock mechanism main body 25 to be connected between the fixed grip piece 22 and the movable grip piece 23. It can arrange | position to the opening part of between. The connecting portion 23j includes a shaft hole 61b in which a first shaft portion 61 for rotatably supporting the movable gripping piece 23 with respect to the fixed gripping piece 22 can be disposed, and a lock mechanism main body 25 to be described later. And a shaft hole 62b in which a second shaft portion 62 that is rotatably supported can be disposed. Further, the connecting portion 23j is provided with a guide piece 234 extending in the direction opposite to the concave portion 233 across the shaft hole 61b.

[Lock mechanism body]
As shown in FIG. 6C, the lock mechanism main body 25 has a main body piece 251 and a lock piece 255 that is rotatably supported by the main body piece 251 via a third shaft portion 63. The lock mechanism main body 25 is provided with a shaft hole 62c in which a second shaft portion 62 that rotatably supports the lock mechanism main body 25 with respect to the movable gripping piece 23 can be disposed.

  A receiving portion 253 is formed on the main body piece 251 of the lock mechanism main body 25. The receiving portion 253 is a concave portion configured with a smooth curved portion so as not to damage the conductive member when contacting the conductive member. The lock piece 255 is a pin-like member that is inserted into the rotation prevention hole 245 of the rotary plate 24 through a lock piece guide hole 222 provided in the fixed gripping piece 22.

[Rotating body]
The rotating body 24 includes a cylindrical portion 24c that can store the cylindrical portion 22c of the fixed gripping piece 22, and a disc portion 24d that extends outward in the radial direction of the cylindrical portion 24c. The cylindrical portion 24c is provided with an insertion hole 247 through which the bolt shaft can be inserted. The rotating body 24 does not rotate with respect to the insulating rod 21, but the bolt so that it rotates with respect to the fixed gripping piece 22. And attached to the cylindrical portion 22c of the fixed gripping piece 22.

  The disc portion 24d includes a slit 241 that opens radially outward of the disc portion 24d, and a guide that extends continuously in the circumferential direction of the disc portion 24d along the outer peripheral edge of the disc portion 24d. And a groove 242. That is, the slit 241 is formed so as to allow the guide piece 234 inserted into the slit 241 to swing in the radial direction of the disc portion 24d, and does not prevent the movable gripping piece 23 from rotating. It is like that. On the other hand, the guide groove 242 is formed to extend in the circumferential direction of the disc portion 24d, that is, in the rotation direction of the rotating body. Of the guide groove 242, the outer peripheral edge of the rotating body is closer to the center of the rotating body 24 as the distance from the slit 241 increases. Further, a marker indicating an appropriate arrangement position of the guide piece 234 in the guide groove 242 is provided on the surface of the rotating body 24 in the vicinity of the terminal end portion of the guide groove 242. The marker is a hatched portion in this figure, and is formed by painting, for example. If the marker is to be formed by painting, for example, it is preferable to make the position of the guide piece easy to check by using a conspicuous color such as red and by contrast with the guide piece.

  Further, the disk portion 24d is provided with an anti-rotation hole 245 at a position substantially point-symmetric with the slit 241 with respect to the center of the disk. When the lock piece 255 of the lock mechanism body 25 is inserted into the rotation prevention hole 245, the rotating body 24 cannot be rotated.

  In addition, gap portions 243 and 244 are provided in the disc portion 24d. The gaps 243 and 244 are formed so as not to block the operator's field of view. Here, the disk part 24d may have a shape in which the frame part on the outer peripheral side of the gap part is removed. However, the strength of the rotating body is higher when the frame portion is present. In this embodiment, as shown in FIG. 6 (D), the outer peripheral edge of the disc portion 24d has a flange shape in order to improve the strength of the rotating body.

  Each configuration described above is arranged as shown in FIG. 5 when the conductive member is not gripped by the gripping mechanism. Specifically, the movable gripping piece 23 is pivotally supported by the fixed gripping piece 22 via the first shaft portion 61, and the opening is closed when rotated clockwise in the figure, and opened when rotated counterclockwise. It is like that. Further, the position of the movable gripping piece 23 with respect to the fixed gripping piece 22 is held by the elasticity of the torsion spring 91 so that the opening does not open unless the conductive member is fitted between the gripping pieces 22 and 23. . This is because one end of the torsion spring 91 is in contact with the fixed gripping piece 22 and the other end is in contact with the movable gripping piece 23, and an intermediate portion of the torsion spring 91 is a torsion spring support 71 of the fixed gripping piece 22. It is because it is wound around.

  Further, the lock mechanism main body 25 is rotatably supported by the movable gripping piece 23 via the second shaft portion 62. The lock mechanism main body 25 maintains the positional relationship with the movable gripping piece 23 in the drawing by the elasticity of the torsion spring 92, and does not rotate unless the receiving portion 253 is pressed by the conductive member. This is because one end of the torsion spring 92 is brought into contact with the lock mechanism main body 25 and the other end is brought into contact with the movable gripping piece 23, and an intermediate portion of the torsion spring 92 is connected to the torsion spring support 72 of the lock mechanism main body 25. It is because it is wound around. By maintaining the positions of the lock mechanism main body 25 and the movable gripping piece 23, the lock piece 255 of the lock mechanism main body 25 is maintained in a state of being inserted into the rotation prevention hole 245 of the rotating body 24.

  When gripping the conductive member using the tulip-type grounding tool 2, first, the conductive member is guided to the opening so as to be hooked by the claw portion 226 of the fixed gripping piece 22. The conductive member 9 guided to the opening is fitted between the recess 223 of the fixed gripping piece 22 and the recess 233 of the movable gripping piece 23 so as to expand the opening (see (A) in FIG. 7). reference). Here, the state of FIG. 7A corresponds to one of so-called half biting states. In this half-engaged state, the positional relationship of the lock mechanism body 25 with respect to the movable gripping piece 23 is maintained by the torsion spring 92, so that the lock piece 255 is inserted into the rotation prevention hole 245. For this reason, the rotating body 24 cannot be rotated by the lock piece 255 inserted into the rotation prevention hole 245, and the release suppressing mechanism for tightening the conductive member 9 held by the holding pieces 22, 23 cannot be operated. It has become.

  When the conductive member 9 is further pushed into the opening of the gripping mechanism from the above-mentioned half biting state, the lock mechanism body 25 is pressed by the conductive member 9 via the receiving portion 253 and rotates clockwise in the drawing ( (See Figure 7 (B)). At this time, of the main body piece 251 of the lock mechanism main body 25, the third shaft portion 63 provided in the vicinity of the end opposite to the receiving portion 253 moves to the left side of the drawing. As the third shaft portion 63 moves, the lock piece 255 that is rotatably supported by the third shaft portion 63 also moves to the left side of the drawing. Only at this time does the lock piece 255 that prevents the rotation of the rotating body 24 come out of the rotation preventing hole 245, so that the rotating body 24 can be rotated. The lock piece 255 comes out of the rotation prevention hole 245 but does not come out of the lock piece guide hole 222. When the conductive member 9 is removed from the gripping mechanism, the lock piece 255 is automatically turned off. It is designed to be plugged into 245.

  When the insulating rod 21 is rotated in a state where the lock piece 255 is removed from the rotation prevention hole 245 as described above, the rotating body 24 rotates with respect to the gripping mechanism. At this time, the outer peripheral edge of the guide groove 242 is in sliding contact with the outer periphery of the guide piece 234. Since the outer edge portion of the guide groove 242 is closer to the center side of the disc portion 24d as it is farther from the slit 241, the position of the guide piece 234 is changed when the rotating body 24 is rotated to the state of FIG. The disk portion 24d can be brought inward in the radial direction. The fact that the guide piece 234 has moved inward in the radial direction of the disc portion 24d means that the guide piece 234 has been pushed downward in the drawing in FIG. 7B and the movable gripping piece 23 has rotated clockwise. Therefore, by rotating the rotating body 24, the conductive member 9 gripped by the gripping mechanism can be tightened.

[Effect of tulip-type grounding tool of this example]
According to the tulip-type grounding tool 2 of Example 2 having such a configuration, the rotating body 24 cannot be rotated when the lock piece 255 is inserted into the rotation preventing hole 245 of the rotating body 24. That is, as long as the conductive member 9 is not gripped at an appropriate position, the lock piece 255 is kept inserted in the rotation prevention hole 245, so that the rotating body 24 can be rotated, that is, the opening suppression mechanism can be operated. Can not. Therefore, the conductive member 9 is not tightened in the half-engaged state, and an electric shock accident of the operator can be prevented.

<Modification 2-1>
In this modification, a tulip-shaped grounding tool having a lock mechanism body having a shape different from that of the tulip-shaped grounding tool of Example 2 and a rotating body will be described with reference to FIG. Since the grounding tool of this example is common to the grounding tool of Example 2 except for the configuration of the lock mechanism main body and a part of the rotating body, only the differences will be described. In addition, since the part which attached | subjected the same code | symbol has the same function as Example 2, description is abbreviate | omitted.

[Lock mechanism body]
Unlike the grounding tool of the second embodiment, the lock mechanism main body 35 of the grounding tool 3 of the present example is rotatably supported by the fixed grip piece 22 via the second shaft portion 64. The position of the lock mechanism main body 35 with respect to the fixed gripping piece 22 is maintained by a torsion spring (not shown), and does not rotate unless the conductive member presses the receiving portion 253.

  Further, the lock mechanism main body 35 does not have the third shaft portion as in the second embodiment. Therefore, in the main body 35, the vicinity of the end opposite to the receiving portion 253 forms a lock piece portion 355 corresponding to the lock piece in the second embodiment.

[Rotating body]
The rotating body 34 of this example has an anti-rotation slit 345 instead of the anti-rotation hole of the second embodiment. The rotation prevention slit 345 is a slit that opens radially outward with respect to the center of the rotating body 34, and is a portion into which the above-described lock piece 355 is inserted.

  The grounding tool 3 of this example having the lock mechanism main body 35 and the rotating body 34 is arranged as shown in FIGS. 8A and 8B when no conductive member is arranged in the gripping mechanism. ing. In this state, since the lock piece 355 is inserted into the rotation prevention slit 345, the lock piece 355 is prevented from rotating and the rotating body 34 cannot be rotated.

  Next, when the conductive member 9 is gripped at an appropriate position of the gripping mechanism (see FIG. 8C), the lock mechanism main body 35 rotates clockwise and the lock piece 355 comes out of the rotation prevention slit 345. It becomes a state. Only in this state can the rotating body 34 be rotated. The mechanism for rotating the rotating body 34 and tightening the conductive member 9 by the gripping mechanism is the same as in the second embodiment.

  As described above, even in the case of the configuration of Modification Example 2-1, the conductive member can be reliably gripped by the gripping mechanism, so that an electric shock accident during work can be prevented.

<Modification 2-2>
Further, in this modification, a tulip-type grounding tool in which a rotating member provided in the tulip-type grounding tool of Example 2 is provided with a wear-resistant member will be described with reference to FIG. The grounding tool of this example is provided with a wear-resistant member on the rotating body so that the guide groove of the rotating body is not damaged by sliding contact with the guide piece. Since the configuration other than the wear-resistant member is the same as that of the second embodiment, only the rotating body will be described below.

  FIG. 9 is a front view of the rotating body of this example, where (A) shows a state before rotating the rotating body, and (B) shows a state after rotating the rotating body. As shown in the figure, a wear-resistant member 246 is attached to the guide groove 242 of the rotating body 24 of this example. The wear-resistant member 246 protrudes inside the guide groove 242 so that the guide piece 234 does not directly contact the guide groove 242 as shown in FIG. 9B.

  The wear-resistant member 246 of this example is a member that follows the shape of the guide groove 242 and is screwed to the rotating body 24 on the back side (the back side of the sheet) of the rotating body 24. In addition, the wear-resistant member may be a leaf spring that urges the guide piece 234 toward the center of the rotating body 24 when the state shown in FIG.

  In this example, the end face of the guide piece 234 is colored with a color that contrasts with the color of the marker (shaded portion in the drawing) of the rotating body 24. Therefore, when the rotating body 24 is rotated and the guide piece 234 is disposed at an appropriate position of the guide groove 242, the position of the guide piece 234 can be easily confirmed.

<Example 3>
In this example, a hook-type grounding tool obtained by improving the grounding tool described in the first embodiment will be described. Note that the same configurations as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 10 is a partial perspective sectional view showing a schematic configuration of the grounding tool of this example. This grounding tool is mainly an improvement of the opening restraining mechanism with respect to the grounding tool of Example 1 described with reference to FIG. Therefore, the difference between the grounding tool of this example and Example 1 will be described below. In FIG. 10, the ball joint bj described in the description of the first embodiment is illustrated.

[Pressure receiving part]
The pressure receiving portion 132 in the grounding tool of the present example is a cylindrical body 132b having a bottom portion, a pressing piece 132c fitted into the cylindrical body 132b, and disposed inside the cylindrical body 132b, in a direction in which the pressing piece 132c exits the cylindrical body 132b. The compression spring 132s is pressed. The cylindrical body 132b is provided at the end of the movable gripping piece 13 opposite to the claw 135, and when the conductive member 9 is disposed between the fixed gripping piece 12 and the movable gripping piece 13, the cylindrical body 132b An opening (a portion from which the pressing piece protrudes) faces the tip of the through shaft 14. Further, the pressing piece 132c has a flange seat so that it does not come out of the cylindrical body 132b. Further, one end of the compression spring 132s is in contact with the bottom of the cylindrical body 132b and the other end is in contact with the flange seat of the pressing piece 132c. That is, the pressure receiving portion 132 of the present example is configured such that when the conductive member 9 is gripped by the grounding tool, the pressing piece 132c and the tip of the through shaft 14 are disposed to face each other, and the pressing piece 132c presses the through shaft 14. It has become. With this configuration, when the insulating rod 11 is rotated to advance the through shaft 14, the pressing piece 132c pressed against the tip of the through shaft 14 is pushed into the cylindrical body 132b, and the compression spring 132s is compressed. . The compressed compression spring 132s presses the bottom of the cylindrical body 132b and rotates the movable gripping piece 13 counterclockwise on the paper surface, so that the conductive member 9 is tightened by the gripping mechanism.

  With the configuration as described above, the conductive member 9 held by the holding pieces 12, 13 can be tightened with an appropriate force by the elasticity of the compression spring 132s. The grip pieces 12 and 13 for fastening the member 9 are not damaged.

[Cam grooves, protrusions that fit into the cam grooves, operation status check plate]
The grounding tool of this example includes a projection 148 that slides in a cam groove 128 that constitutes an opening restraining mechanism, and an operation status confirmation plate 126 that makes it easy to visually confirm where the projection 148 is located in the cam groove 128. With Hereinafter, the configuration of the cam groove 128, the protrusion 148, and the operation state confirmation plate 126 will be described in detail with reference to FIG.

  FIG. 11 (A) is an enlarged view of the vicinity of the protrusion 148 of the grounding tool, (B) is a view of (A) as viewed from above, and shows a view in which the protrusion 148 is omitted, and FIG. FIG. 12 is an AA arrow view of FIG. As shown in FIGS. 11A and 11B, the cam groove 128 of this example is formed so as to spirally extend from the hand side of the grounding tool (right side of the paper) to the tip of the grounding tool (left side of the paper). ing. The cam groove 128 has a recess 128x formed by cutting out to the grounding tool hand side at the end of the spiral, and a recess 128y formed by cutting out to the grounding tool hand side at an approximately middle position of the spiral. With.

  Further, unlike the protrusion of the first embodiment, the protrusion (projection piece) 148 provided on the outer periphery of the through shaft 14 of the grounding tool protrudes from the cam groove 148 and protrudes when viewed from the insulating rod side. Is visible. In this example, a screw screwed from the outer peripheral side of the through shaft 14 is used as a protrusion 148 so that the screw head protrudes from the cam groove 128. By moving the shaft portion of the protrusion 148 along the cam groove 128, the advance position of the through shaft 14 can be adjusted.

  Further, in the grounding tool of this example, a plate-like operation state confirmation plate (a protrusion of the fixed gripping piece is provided on the outer periphery of the fixed gripping piece 12 near the cam groove 128 and on the distal end side of the through shaft 14 with respect to the cam groove 128. Piece) 126 is provided. The operation state confirmation plate 126 is a member for confirming the operation state of the opening suppression mechanism by visually confirming the positional relationship of the protrusion 148 with respect to the confirmation plate 126. Markers m1 and m2 are formed on the confirmation plate 126 at the positions indicated by the oblique lines in FIGS. 11C and 11D. The markers m1 and m2 visually check the position of the protrusion 148 from the insulating rod side. It is easy to confirm with. The marker m1 indicates the state before the operation of the opening suppression mechanism, that is, the position of the protrusion 148 when the penetrating shaft 14 is not advanced, and the marker m2 indicates the state at the end of the operation of the opening suppression mechanism, that is, the grip The position of the protrusion 148 when the penetrating shaft 14 is advanced to a position where the conductive member does not come off the mechanism is shown. The markers m1 and m2 may be formed by painting, or may be formed by unevenness that can be easily visually confirmed. Preferably, the marker is formed by painting that makes a contrast with the protrusion 148. Further, it is preferable to clarify whether the two markers m1 and m2 indicate before or after the operation of the opening suppression mechanism. For example, if the marker m1 is cold, the marker m2 is warm.

  Next, how to confirm the operation status of the opening suppression mechanism based on the positional relationship between the protrusion 148 of the through shaft 14 and the operation status confirmation plate 126 will be described. First, the arrangement state of the protrusions 148 shown in FIGS. 11A and 11C is a state before the operation of the opening suppression mechanism. When operating the release restraint mechanism from this state, rotate the insulation rod so that the shaft of the projection 148 is pressed against the edge opposite to the recess of the cam groove, and move the shaft of the projection 148 along the cam groove 128. Let When the axis of the protrusion 148 is moved, the operator who holds the insulating rod can confirm that the protrusion 148 is rotating in the direction of the arrow (clockwise) in FIG. Then, when the shaft of the protrusion 148 is moved to the end of the cam groove 128, as shown in FIG. 11 (D), the protrusion 148 overlaps the position of the marker m2, so that an opening suppression mechanism is provided until the conductive member is properly gripped. It can be visually confirmed that it has been operated. If the force pushing the insulating rod is loosened in this state, the penetrating shaft is pulled to the near side by the weight of the insulating rod, so the shaft of the protrusion 148 fits into the recess 128x of the cam groove 128, and the advancement position of the penetrating shaft 14 is set. Can be maintained. Furthermore, in the configuration of this example, the tip of the through shaft 14 is pressed by the pressing piece 132c of the pressure receiving portion 132 as shown in FIG. 10, and therefore the shaft of the projection 148 is fitted into the recess 128x and is difficult to come off. ing. Therefore, the projection 148 does not return to the position before the operation start along the cam groove 128 to the extent that the grounding tool is vibrated somewhat. Even if the shaft of the protrusion 148 is disengaged from the recess 128x and slides along the cam groove 128, the shaft fits into the recess 128y provided in the intermediate portion of the cam groove 128. In addition, in the configuration of this example, since the tip of the through shaft 14 is pressed by the pressing piece of the pressure receiving portion, the shaft of the projection 148 that slides along the cam groove 128 fits into the recess 128y almost certainly. Therefore, in the grounding tool of this example, the opening suppression mechanism does not loosen at a stretch.

[Other improvements]
In the grounding tool of this example, the shape of the connection pedestal that connects the grounding wire to the fixed gripping piece is further changed from that of Example 1. Specifically, the grounding tool of the present example is provided with a vertical piece extending vertically from the fixed gripping piece 12 on the base side of the fixed gripping piece 12 and in the vicinity of the operation state confirmation plate 126. A connection base 124 is provided so as to extend obliquely with respect to the vertical piece (see FIG. 10). Further, a portion having a ground wire guide hole 125 is provided from the end of the connection base 124 so as to be substantially parallel to the vertical piece. The height of the vertical piece is higher than the height of the protrusion 148 protruding from the cam groove 128, and the grounding wire guide hole 125 side of the connection base 124 is higher than the vertical piece side, and is inclined with respect to the axis of the through shaft 14. Is formed. Further, the end portion of the grounding wire guide hole 125 on the insulating rod side extends over the cam groove 128. With such a configuration, the drawing direction of the ground wire that is bolted to the connection base 124 and passes through the ground wire guide hole 125 is defined as a direction away from the gripping mechanism. That is, when a grounding wire is attached to the grounding tool in FIG. 10, the grounding wire is once separated outward in the radial direction of the penetrating shaft 14, and then curved and hangs down on the paper surface. It does not interfere with the rotation of the insulating rod 11 by coming into contact with the protrusion 148, nor does it interfere with the holding of the conductive member 9 by being fitted into the opening of the holding mechanism. In addition, since the field of view of the ground wire connection location can be secured by the regulation of the direction of drawing out of the ground wire, it is possible to confirm whether the protrusion 148 has rotated to an appropriate position and the conductive member 9 in the opening of the gripping mechanism. It is easy to visually check whether or not the user is guided.

  The grounding tool of the present invention can be suitably used for maintenance / inspection work of overhead power transmission lines and the like.

FIG. 1 is a partial perspective cross-sectional view showing a schematic configuration of a hook-type grounding tool described in the first embodiment. 2A and 2B are diagrams showing each component of the hook-type grounding device of FIG. 1, wherein FIG. 2A is a partial cross-sectional view of a fixed grip piece viewed from the side, and FIG. 2B is a movable grip viewed from the side. (C) is a side view of the lock mechanism main body, and (D) is a partial cross-sectional view of the penetrating shaft. FIGS. 3A and 3B are diagrams for explaining a state in which the conductive member is gripped by the hook-type grounding tool of FIG. 1, wherein FIG. 3A shows a half-engaged state, and FIG. 3B shows a state where the conductive member is gripped at an appropriate position. FIG. FIG. 4 is a partial perspective cross-sectional view of the hook-type grounding tool described in the modification, and FIG. 4 (A) is a diagram illustrating a cam groove provided in the fixed gripping piece having a C-shape. ) Is a diagram showing a cam groove having an S-shape. FIG. 5 (A) is a partially transparent sectional view showing a schematic configuration of the tulip-type grounding tool described in Example 2, and FIG. 5 (B) is a diagram showing a state in which the guide piece and the lock piece are inserted into the rotating body. . 6A and 6B are diagrams showing components of the tulip-type grounding tool of FIG. 5, where FIG. 6A is a partial sectional view of a fixed grip piece viewed from the side, and FIG. 6B is a movable grip viewed from the side. (C) is a side view of the lock mechanism main body, (D) is a partial cross-sectional view of the rotating body viewed from the side, and (E) is a front view of the rotating body. FIGS. 7A and 7B are diagrams for explaining a state in which the conductive member is gripped by the tulip-type grounding tool of FIG. 5, in which FIG. 7A shows a half-engaged state, and FIG. 7B shows a state where the conductive member is gripped at an appropriate position. (C) is a figure which shows the state of the rotary body after rotating a rotary body. FIG. 8 (A) is a partially transparent sectional view showing a schematic configuration of the tulip-type grounding tool described in the modification, and (B) is a diagram showing a state where the guide piece and the lock piece are inserted into the rotating body, (C) is a figure which shows the state by which the electrically-conductive member was hold | gripped in the appropriate position. FIG. 9 is a front view of the rotating body described in the modified example 2-2, (A) shows a state before rotating the rotating body, and (B) shows a state after rotating the rotating body. . FIG. 10 is a partial perspective cross-sectional view illustrating a schematic configuration of the hook-type grounding tool described in the third embodiment. 11 (A) is an enlarged view of the vicinity of the protrusion of the grounding tool shown in FIG. 10, (B) is a view of (A) as viewed from above, (C) is a view taken along arrow AA in (A), ) Is a diagram showing a state when the protrusion is moved from the state of (C) to the end of the cam groove. FIG. 12 is a schematic configuration diagram of a conventional hook-type grounding tool. FIG. 13 is a schematic configuration diagram showing a conventional tulip-type grounding tool.

Explanation of symbols

1 Hook-type grounding device
11 Insulating rod 51 First shaft 52 Second shaft 81,82 Torsion spring
12 Fixed gripping piece 12g Grip part 12c Tube part
121 Through hole 122 Slit hole 123 Recessed part 124 Connection base
125 Ground wire guide hole 126 Operation status check plate m1, m2 Marker
127 Seat cylinder 128,129 Cam groove 128x, 128y Recess 51a Shaft hole
129b, 129c Cam groove
129b1,129c1 First lateral groove 129b2,129c2 Vertical groove 129b3,129c3 Second lateral groove
13 Movable gripping piece 13g Holding part 13j Connecting part
131 Pressure sensing part 133 Concave part 135 Claw part 51b Shaft hole 52b Shaft hole
132 Pressure sensing part 132b Cylinder 132c Pressing piece 132s Compression spring
14 Through shaft 141 Tip 142 Anti-rotation slit
143 Flange seat 148,149 Protrusion 14s Compression spring
15 Lock mechanism body 153 Receiving part 155 Stopping part 52c Shaft hole
2 Tulip type grounding tool
21 Insulating rod 61 First shaft 62 Second shaft 91,92 Torsion spring
22 Fixed gripping piece 22b Base 22g Holding part 22j Connection part
22c Tube 22r Lock piece guide 222 Lock piece guide hole
223 Recess 61a Shaft hole 71 Torsion spring support
224 Grounding base 225 Grounding wire guide hole 226 Claw
23 Movable gripping piece 23g Holding part 23j Connecting part
232 Body insertion hole 233 Recess 234 Guide piece 61b Shaft hole 62b Shaft hole
24 Rotating body 24c Tube part 24d Disk part
241 Slit 242 Guide groove 243,244 Gap 245 Anti-rotation hole
246 Wear resistant member 247 Insertion hole
25 Lock mechanism body 251 Body piece 253 Receiver 255 Lock piece
62c Shaft hole 72 Torsion spring support 63 Third shaft
3 Tulip type grounding tool
34 Rotating body 345 Anti-rotation slit
35 Lock mechanism body 355 Lock piece 64 Second shaft
4 Hook-type grounding device
401 Insulating rod 402 Fixed grip piece 403 Movable grip piece 404 Ground wire
405 Earth side bracket 406 Bolt shaft 407 Pressure sensing part
5 Tulip-shaped grounding tool
501 Insulating rod 502 Fixed gripping piece 503 Movable gripping piece 504 Ground wire
505 Earth side bracket 506 Bolt shaft 507 Pressure receiving part
9 Conductive member bj Ball joint

Claims (13)

A grounding tool that grips the conductive member and releases the current flowing through the conductive member to the ground,
An insulating rod;
A gripping mechanism that is rotatably provided at the tip of the insulating rod and has a pair of gripping pieces for gripping the conductive member;
An opening suppression mechanism that suppresses the opening of the gripping mechanism from a state in which the conductive member is gripped at an appropriate position of the gripping mechanism using the rotation of the insulating rod;
A lock mechanism that restricts the operation of the opening suppression mechanism,
The gripping mechanism includes a fixed grip piece connected to the tip of the insulating rod, and a movable grip piece that is rotatably supported via a first shaft portion provided on the fixed grip piece,
The opening restraining mechanism is fixed to the insulating rod, and rotates with respect to the gripping mechanism by rotating the insulating rod, and the movable gripping piece rotates in the direction in which the gripping mechanism is released by the rotation of the rotating portion. And a suppression mechanism that suppresses this,
The lock mechanism includes a lock mechanism body that is rotatably supported via a second shaft portion provided on either the fixed grip piece or the movable grip piece, and a part of the lock mechanism body that is gripped by the grip mechanism. A receiving portion pressed against the conductive member, and a rotation prevention hole for preventing rotation of the rotating portion by inserting a part of the lock mechanism main body,
When the conductive member is not gripped in the proper position of the gripping mechanism, a part of the lock mechanism body is inserted into the anti-rotation hole, relative rotation of the insulating rod and the gripping mechanism is restricted,
When the conductive member is gripped in a proper position of the gripping mechanism includes a feature that the lock mechanism body rotated by being pressed to the conductive member is disengaged from the anti-rotation hole, relative rotation of the insulating rod and the gripping mechanism is allowed Grounding tool to be used. The first shaft portion is provided on the distal end side of the fixed grip piece, and the opening formed by the fixed grip piece and the movable grip piece opens to the insulating rod side,
The rotating portion in the opening restraining mechanism has a through shaft configured to pass through the fixed gripping piece and move forward and backward with respect to the fixed gripping piece.
The suppression mechanism portion is provided on a protrusion provided on the outer periphery of the penetrating shaft, a sliding groove with which the protrusion engages, and a movable gripping piece. When the conductive member is gripped at an appropriate position of the gripping mechanism, the penetrating shaft A pressure receiving portion having a surface intersecting with the axis of
When the penetrating shaft is rotated and the protrusion is moved along the sliding groove, the movable gripping piece is prevented from rotating such that the conductive member is detached from the gripping mechanism by the contact between the tip of the penetrating shaft and the pressure receiving portion. 2. The grounding tool according to claim 1 , wherein the grounding tool is configured to advance the penetrating shaft in the axial direction to a position where it can be moved. The rotation prevention hole in the lock mechanism is provided at a position where a part of the lock mechanism body can be inserted into the through shaft,
When the conductive member is gripped at an appropriate position between the fixed gripping piece and the movable gripping piece, the lock mechanism body that is rotated by being pressed by the conductive member is configured to come out of the rotation prevention hole. The grounding tool according to claim 2 . The grounding tool according to claim 2 or 3 , wherein a projecting piece is provided on each of the penetrating shaft and the fixed gripping piece, and the rotation state of the insulating rod can be grasped by the positional relationship between the projecting pieces. The ground receiving tool according to any one of claims 2 to 4 , wherein the pressure receiving portion includes an elastic member that presses a tip of the penetrating shaft. In order not to obstruct the gripping / clamping operation of the conductive member, in order to define the direction in which the grounding wire connected to the fixed gripping piece is pulled out, the grounding wire mounting surface is connected to the grounding wire axis. It is formed so that it may incline with respect to the axis line of a penetration axis | shaft, The grounding tool as described in any one of Claims 2-5 characterized by the above-mentioned. The sliding groove is a cam groove that spirally extends from the proximal side to the distal end side of the grounding tool, and projections are fitted into the terminal and intermediate portions of the cam groove to maintain the advancement position of the through shaft. It has a recessed part, The grounding tool as described in any one of Claims 2-6 characterized by the above-mentioned. The first shaft portion is provided on the insulating rod side of the fixed gripping piece, and the opening formed by the fixed gripping piece and the movable gripping piece opens on the distal end side of the fixed gripping piece,
The rotating part in the opening suppression mechanism is provided at the tip of the insulating rod, and has a rotating body that can rotate with respect to the gripping mechanism by rotating the insulating rod,
The suppression mechanism portion is provided on the movable gripping piece and extends toward the rotating body, the slit provided on the rotating body and allowing the guide piece to move in the radial direction with respect to the rotation center of the rotating body, and the slit And a guide groove extending circumferentially with respect to the rotation center of the rotating body,
The grounding tool according to claim 1 , wherein the grounding tool is configured to suppress rotation of the movable gripping piece by rotating the rotating body and arranging the guide piece in the guide groove. The farther the outer edge of the guide groove in the suppression mechanism section is from the slit, the closer to the center of rotation of the rotating body is inward or outward in the radial direction, and the rotating body is rotated to move the guide piece along the guide groove. 9. The structure according to claim 8 , wherein the movable holding piece is rotated by moving the guide piece radially inward or outward with respect to the rotation center to tighten the conductive member. The grounding tool described. The rotation prevention hole in the lock mechanism is provided at a position where a part of the lock mechanism main body can be inserted in the rotating body,
When the conductive member is gripped at an appropriate position between the fixed grip piece and the movable grip piece, the lock mechanism body pressed by the conductive member via the receiving portion rotates, and the lock mechanism body comes out of the rotation prevention hole. The grounding tool according to claim 8 or 9 , wherein the grounding tool is configured as described above. The grounding tool according to any one of claims 8 to 10 , wherein the rotating body has a marker indicating an appropriate arrangement position of the guide piece in the guide groove. When the guide pieces are arranged in the sliding groove, one claim 8 to 11, characterized in that a wear-resistant member which is detachably attached to the rotating body so as to contact the guide piece The grounding tool as described in the item. The grounding tool according to any one of claims 1 to 12 , wherein a claw portion for hooking the conductive member to guide the conductive member to the opening is provided at a tip of the fixed grip piece.

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