JP2018057247A - Short circuit ground apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a short circuit ground apparatus operated according to a mounting procedure to an electric line and according to a removing procedure.SOLUTION: The apparatus comprises a hook part 3 mounted to an insulation rod 1, a terminal part 5 mounted to a ground member, a ground line 7 electrically connecting the hook part 3 and a terminal part 5, and a common key 9 that can be inserted in the hook part 3 and the terminal part 5. When the common key 9 is inserted in the terminal part 5, the terminal part 5 can be fixed to the ground member. When the terminal part 5 is fixed to the ground member, the common key 9 can be drawn from the terminal part 5. When the common key 9 is inserted in the hook part 3, the hook part 3 can be opened/closed. When the hook part 3 is opened, the common key 9 can be drawn from the hook part 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a short-circuit grounding device.

  Inspections and electrical work on power lines such as power transmission lines are performed with the inspection points and work points in a power failure state, but an induced current may be induced in the power lines even during power failure work. Therefore, an operator works by using a ground hook (see, for example, Patent Documents 1 to 3). The ground hook is a short-circuit grounding device, and an insulating rod (operation rod), a metal hook member pivotally supported at the tip of the insulating rod, and an opening / closing mechanism that opens and closes the hook member by operating the operating means. A mechanism and a ground wire with a grounding metal connected to the hook member.

JP 2010-35305 A JP 2012-39679 A JP 2013-26071 A

  As a procedure for attaching the ground hook, the operator needs to attach the ground hook to the electric wire after attaching the grounding fitting to the ground plate or the like. Further, as a procedure for removing the ground hook, the operator needs to remove the ground metal fitting from the ground plate or the like after removing the ground hook from the electric line. However, the operator may mistake the procedure for attaching and removing the ground hook.

  The present invention has been made in view of the above, and an object of the present invention is to provide a short-circuit grounding device that is operated according to an attachment procedure and is operated according to a removal procedure with respect to an electric wire.

  A short-circuit grounding apparatus according to an aspect of the present invention electrically connects an insulating rod, a hook portion attached to one end of the insulating rod, a terminal portion attached to a ground member, and the hook portion and the terminal portion. A ground key to be connected; and a common key that can be inserted into the hook portion and the terminal portion, and the terminal portion is fixed to the ground member when the common key is inserted into the terminal portion. The common key can be pulled out from the terminal portion when the terminal portion is fixed to the ground member, and the hook portion is opened and closed when the common key is inserted into the hook portion. The common key can be pulled out from the hook portion when the hook portion is open. According to this, the hook portion cannot be opened and closed unless the terminal portion is fixed to the ground member. If the hook portion is not open, the terminal portion cannot be separated from the ground member.

  A short-circuit grounding apparatus according to an aspect of the present invention electrically connects an insulating rod, a hook portion attached to one end of the insulating rod, a terminal portion attached to a ground member, and the hook portion and the terminal portion. A ground key to be connected; and a common key to be inserted into each of the hook portion and the terminal portion. The terminal portion includes a first key hole into which the common key is inserted, and a first key for tightening the ground member. A first screw portion, the first screw portion is rotatable when the common key is inserted into the first key hole, and the common key is configured so that the first screw portion has the first screw portion. When the ground member is tightened, it can be pulled out from the first key hole, and the hook portion is rotated by the second key hole into which the common key is inserted, the second screw portion, and the second screw portion. Open and close by opening and closing And the second screw part is rotatable when the common key is inserted into the second key hole, and the common key is open when the opening / closing hook is open. And can be pulled out from the second key hole. According to this, the opening / closing hook cannot be opened / closed unless the terminal portion fastens the ground member. Further, if the opening / closing hook is not opened, the terminal portion cannot loosen the ground member.

  As a desirable aspect of the present invention, the terminal portion includes a first lock portion that locks the first screw portion so as not to rotate, and a second lock portion that locks the common key so as not to come out of the first key hole. The hook portion includes a third lock portion that locks the second screw portion so as not to rotate, and a fourth lock portion that locks the common key so as not to come out of the second key hole. The first lock portion is unlocked when the common key is inserted into the first key hole, and the second lock portion is unlocked when the first screw portion tightens the ground member. The third lock part is unlocked when the common key is inserted into the second key hole, and the fourth lock part is unlocked when the opening / closing hook is opened. According to this, since the common key cannot be removed from the first key hole unless the terminal portion is tightening the ground member, the opening / closing hook cannot be opened / closed. If the hook portion is not open, the common key cannot be removed from the second key hole, so that the terminal portion cannot loosen the ground member.

  As a preferred aspect of the present invention, the common key has a shaft portion in which a first key groove and a second key groove are formed on an outer peripheral surface, and the first key groove extends from one end to the other end of the shaft portion. The second keyway is connected to the first keyway and extends in the circumferential direction of the shaft portion. According to this, the 1st keyway can be made to oppose the inner wall predetermined position of the 1st key hole or the 2nd key hole. Further, by rotating the shaft portion in the axial direction, the second key groove can be opposed to the predetermined position on the inner wall.

  As a preferred aspect of the present invention, the second lock portion includes a first protrusion protruding from an inner wall of the first key hole toward a diametrical center of the first key hole, and the shaft portion. Is inserted into the first key hole, the first protrusion is located inside the first key groove or the second key groove, and the shaft rotates around the axis. The first protrusion moves relatively from one of the first keyway and the second keyway to the other. According to this, when a 1st projection part is located inside a 1st keyway, an axial part can move to an axial direction. Further, when the first protrusion is positioned inside the second keyway, the shaft cannot move in the axial direction.

  As a desirable aspect of the present invention, the fourth lock portion has a second protrusion protruding from an inner wall of the second key hole toward a central portion in the diameter direction of the second key hole, and the shaft portion is When inserted into the second key hole, the second protrusion is located inside the first key groove or the second key groove, and the shaft rotates around the axis, The second protrusion moves relatively from one of the first keyway and the second keyway to the other. According to this, when a 2nd projection part is located inside a 1st keyway, an axial part can move to an axial direction. Further, when the second protrusion is positioned inside the second keyway, the shaft cannot move in the axial direction.

  As a preferred aspect of the present invention, a first groove portion extending in an axial direction of the first screw portion is formed on an outer peripheral surface of the first screw portion, and the first lock portion is the first lock portion. It has a 1st lock pin which locks rotation around the axis of the 1st screw part by being arranged inside a slot, and the 1st lock pin has the common key inserted in the 1st key hole. And moves from the inside to the outside of the first groove. According to this, when the common key is inserted into the first key hole, the rotation lock on the first screw portion is released.

  As a preferred aspect of the present invention, a third key groove having a shorter length in the circumferential direction than the second key groove is formed on the outer peripheral surface of the shaft portion, and the second lock portion is 3 having a second lock pin that locks rotation around the axis of the shaft portion by being arranged inside the keyway, and the second lock pin is configured such that when the first screw portion tightens the ground member, The third keyway moves from the inside to the outside. According to this, when the first screw portion tightens the ground member, the rotation lock with respect to the common key is released.

  As a preferred aspect of the present invention, a second groove portion extending in an axial direction of the second screw portion is formed on an outer peripheral surface of the second screw portion, and the third lock portion is the second lock portion. It has a 3rd lock pin which locks rotation around the axis of the 2nd screw part by being arranged inside a slot, and the 3rd lock pin has the common key inserted in the 2nd key hole. And moves from the inside to the outside of the second groove. According to this, when the common key is inserted into the second key hole, the rotation lock on the second screw portion is released.

  As a desirable mode of the present invention, at least a part of the common key is a magnet. According to this, the common key can be attached to the first casing or the second casing by magnetic force.

  According to the present invention, it is possible to provide a short-circuit grounding device that is operated according to the attachment procedure and operated according to the removal procedure with respect to the electric wire.

FIG. 1 is a diagram illustrating a configuration example of a short-circuit grounding apparatus according to the present embodiment. FIG. 2 is a perspective view illustrating a configuration example of the terminal portion according to the present embodiment. FIG. 3 is a cross-sectional view of the terminal portion shown in FIG. 2 cut along the XZ plane. FIG. 4 is a cross-sectional view illustrating a configuration example of the first housing. FIG. 5 is a front view illustrating a configuration example of the first screw portion. FIG. 6 is a cross-sectional view of the first screw portion shown in FIG. 5 cut along line X5-X′5. FIG. 7 is a plan view illustrating a configuration example of the first lock pin according to the present embodiment. FIG. 8 is a cross-sectional view of the first portion including the first lock pin in the terminal portion shown in FIG. 2 cut along the XY plane. FIG. 9 is a cross-sectional view of the first portion including the first lock pin in the terminal portion shown in FIG. 2 cut along the XY plane. FIG. 10 is a cross-sectional view of the terminal portion shown in FIG. 2 in which a second portion including the second lock pin is cut along the XY plane. FIG. 11 is a plan view showing a configuration example of the common key according to the present embodiment. FIG. 12 is a left side view illustrating a configuration example of the common key according to the present embodiment. FIG. 13 is a front view showing a configuration example of the common key according to the present embodiment. FIG. 14 is a right side view illustrating a configuration example of the common key according to the present embodiment. FIG. 15 is a rear view illustrating a configuration example of the common key according to the present embodiment. FIG. 16 is a bottom view illustrating a configuration example of the common key according to the present embodiment. FIG. 17 is a diagram illustrating a configuration example of a hook piece and a hook receiving unit according to the present embodiment. FIG. 18 is a diagram illustrating a configuration example of a hook piece and a hook receiving unit according to the present embodiment. FIG. 19 is a perspective view illustrating a configuration example of the hook portion according to the present embodiment. FIG. 20 is a cross-sectional view of the hook portion shown in FIG. 19 cut along the XZ plane. FIG. 21 is a diagram illustrating an attachment state of the first arm and the second arm with respect to the second rotation shaft. FIG. 22 is a diagram illustrating a state in which the first arm and the second arm are attached to the second rotation shaft. FIG. 23 is a diagram illustrating an attachment state of the first arm and the second arm with respect to the second rotation shaft. FIG. 24 is a side view showing a configuration example of the third arm. FIG. 25 is a side view showing a configuration example of the third arm. FIG. 26 is a cross-sectional view illustrating a configuration example of the second housing. FIG. 27 is a front view illustrating a configuration example of the second screw portion. FIG. 28 is a cross-sectional view of the second threaded portion shown in FIG. 27 taken along line X27-X′27. FIG. 29 is a cross-sectional view of a portion including the third lock pin of the hook portion shown in FIG. 20 cut along an XY plane. FIG. 30 is a cross-sectional view of a portion including the third lock pin of the hook portion shown in FIG. 20 taken along the XY plane. FIG. 31 is a flowchart showing a procedure for attaching the short-circuit grounding device to the electric line. FIG. 32 is a cross-sectional view showing a procedure for attaching the short-circuit grounding device to the electric line. FIG. 33 is a cross-sectional view showing a procedure for attaching the short-circuit grounding device to the electric line. FIG. 34 is a flowchart showing a procedure for removing the short-circuit grounding device from the electric line. FIG. 35 is a cross-sectional view showing a procedure for removing the short-circuit grounding device from the electric line. FIG. 36 is a cross-sectional view showing a procedure for removing the short-circuit grounding device from the electric wire path.

  EMBODIMENT OF THE INVENTION The form (embodiment) for implementing this invention is demonstrated in detail, referring drawings. The present invention is not limited by the contents described in the present embodiment. The constituent elements described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the constituent elements described below can be appropriately combined.

  FIG. 1 is a diagram illustrating a configuration example of a short-circuit grounding apparatus according to the present embodiment. In the case of a power outage work at a power substation or a power outage work on a power transmission line, it is necessary to take measures to prevent electric shock in order to ensure the safety of the worker. In order to reduce the risk of electric shock due to mis-energization, contact with other electric circuits or wires (hereinafter referred to as electric wires), or induction from other electric wires, use a short-circuit earthing device called an earth hook. Must be shorted to ground.

  As shown in FIG. 1, a short-circuit grounding device 100 according to this embodiment includes an insulating rod 1, a hook portion 3, a terminal portion 5, a ground wire 7, and a common key 9. When carrying out a power outage operation in the electrical equipment, the worker fixes the terminal portion 5 to the grounding means (grounding location) and fixes the hook portion 3 to a grounding location (electric inflow end) such as a busbar of the electric wire path. By doing so, they are shorted to ground. An electric line is a conductor that can be induced by an induced current, including a substation, a power transmission line that supplies power, and supports (such as a steel tower and insulator), and incidental facilities. The ground wire 7 is a conductive member that electrically connects the hook portion 3 and the terminal portion 5.

  The insulating rod 1 includes an insulating rod main body 11. The insulating rod body 11 is made of an insulating material such as an epoxy resin. When the insulating rod main body 11 rotates, the second screw portion 41 of the hook portion 3 rotates around the axis of the second screw portion 41.

  FIG. 2 is a perspective view illustrating a configuration example of the terminal portion according to the present embodiment. FIG. 3 is a cross-sectional view of the terminal portion shown in FIG. 2 cut along the XZ plane. The terminal portion 5 is a member for electrically connecting the ground wire 7 and the ground member shown in FIG. Examples of the ground member include a driving ground rod (not shown) driven into the ground, a metal plate connected to the driving ground rod, and the like. As shown in FIGS. 2 and 3, the terminal portion 5 includes a first housing 50, a first screw portion 61, a pressing plate 62, a first lock pin 63, an elastic member 64, and a second lock pin. 65, an elastic member 66, and a hook piece 71. The first housing 50, the first screw portion 61, the pressing plate 62, the first lock pin 63, the elastic member 64, the second lock pin 65, the elastic member 66, and the hook piece 71 are made of a conductive material such as metal, for example. . The elastic member 64 and the elastic member 66 are, for example, compression coil springs.

  In the present embodiment, the thickness direction of the terminal portion 5 and the thickness direction of the hook portion are each defined as the Z direction. Further, in the plane orthogonal to the Z direction, the direction in which the first lock pin 63 moves and the direction in which a later-described third lock pin 43 (see, for example, FIG. 20) of the hook portion 3 moves are defined as the X direction. . A direction perpendicular to the Z direction and the X direction is defined as a Y direction.

  FIG. 4 is a cross-sectional view illustrating a configuration example of the first housing. As illustrated in FIG. 4, the first housing 50 includes a first part 51, a second part 52 that faces the first part 51 in the Z direction, and a third part that connects the first part 51 and the second part 52. Part 53. The first portion 51 is provided with a through hole 511, a screw hole 513, and a first space portion 515. A screw hole 513 is provided at a position overlapping with the through hole 511 in the Z direction. The through hole 511 and the screw hole 513 are connected via the first space portion 515. The first space portion 515 is a space having a spread in the X direction and the Y direction. The first screw part 61 is passed through the through hole 511 and the screw hole 513 as shown in FIG. A screw groove 513 a is provided on the inner wall of the screw hole 513. Further, the first lock pin 63 is disposed in the first space 515 as shown in FIG.

  The second part 52 is provided with an opening 521 that opens to the first part 51 side and a second space 523 that is connected to the opening 521. An opening 521 is provided at a position overlapping the screw hole 513 in the Z direction. The second space portion 523 is a space having a spread in the X direction and the Y direction. As shown in FIG. 3, the second lock pin 65 is disposed in the opening 521 and the second space 523.

  In the Z direction, a first key hole 54 is provided in a portion where the first portion 51, the second portion 52, and the third portion 53 overlap. In the X direction, the first key hole 54 is connected to the first space portion 515 and the second space portion 523, respectively. A first protrusion 50a is provided on the inner wall of the first key hole 54 to prevent the key from being detached. In the present embodiment, the ground member is disposed in the third space 55 located between the screw hole 513 and the opening 521 in the Z direction.

  FIG. 5 is a front view illustrating a configuration example of the first screw portion. FIG. 6 is a cross-sectional view of the first screw portion shown in FIG. 5 cut along line X5-X′5. As illustrated in FIGS. 5 and 6, the first screw portion 61 includes a cylindrical body 611 and a head 613 provided at one end of the body 611. A screw thread 611 a is provided on the outer peripheral surface of the body portion 611. The screw thread 611a corresponds to the screw groove 513a of the screw hole 513 shown in FIG. As a result, the first screw portion 61 is screwed into the screw hole 513. In addition, a first groove portion 611b extending in the Z direction is provided on the outer peripheral surface of the body portion 611. For example, as shown in FIG. 6, the body portion 611 is provided with four first groove portions 611b. The four first groove portions 611b are arranged at equal intervals of 90 ° when viewed from the axis 611c of the body portion 611. Each of the four first groove portions 611b is formed larger in size than the second tip portion 635 so that a second tip portion 635 (see, for example, FIG. 7) described later of the first lock pin 63 is inserted. Yes.

  FIG. 7 is a plan view illustrating a configuration example of the first lock pin according to the present embodiment. As shown in FIG. 7, the first lock pin 63 has an annular base portion 631, a first tip portion 633, a second tip portion 635 and a holding portion 637. The shape of the ring of the base portion 631 is, for example, a rectangle. The first tip portion 633, the second tip portion 635, and the holding portion 637 are fixed to the base portion 631, respectively. In the X direction, the first tip portion 633 is provided from one end of the base portion 631 toward the outside of the ring of the base portion 631. Further, in the X direction, the second tip end portion 635 is provided from the other end of the base portion 631 toward the inside of the ring of the base portion 631. Further, in the X direction, the holding portion 637 is directed from the other end of the base portion 631 to the outside of the wheel of the base portion 631. The base portion 631, the first tip portion 633, the second tip portion 635, and the holding portion 637 are integrally formed. The elastic member 64 is, for example, a compression coil spring, and a holding portion 637 is disposed inside the compression coil spring. Thereby, the holding portion 637 holds the elastic member 64 while suppressing the movement in the Y direction.

  8 and 9 are cross-sectional views of the terminal portion shown in FIG. 2, in which a first portion including the first lock pin is cut along the XY plane. 8 shows a case where the common key is not inserted into the first key hole 54, and FIG. 9 shows a case where the common key 9 is inserted into the first key hole 54. As shown in FIG. 8, when the common key 9 is not inserted in the first key hole 54, the first tip 633 is pushed out to the first key hole 54 by the elastic member 64, and the second tip 635 is It is pressed against the outer peripheral surface of the first screw part 61. At this time, if the second tip portion 635 is fitted into the first groove portion 611b, the first screw portion 61 cannot rotate around the axis. Even when the second tip 635 does not face the first groove 611b, the first groove 611b moves to a position facing the second tip 635 when the first screw 61 rotates about the axis. As a result, the second tip portion 635 fits into the first groove portion 611b, and the first screw portion 61 cannot rotate any further. Thus, when the common key 9 is not inserted into the first key hole 54, the rotation of the first screw portion 61 is locked by the first lock pin 63.

  On the other hand, as shown in FIG. 9, when the common key 9 is inserted into the first key hole 54, the first tip 633 is pushed back to the outside of the first key hole 54 by the common key 9, and the second tip 635 moves from the inside to the outside of the first groove 611b. As indicated by a broken line arrow in FIG. 9, the elastic member 64 is contracted, and the first lock pin 63 is separated from the first screw portion 61, so that the first screw portion 61 can rotate around the axis. As described above, when the common key 9 is inserted into the first key hole 54, the first lock pin 63 unlocks the first screw portion 61.

  FIG. 10 is a cross-sectional view of the terminal portion shown in FIG. 2 in which a second portion including the second lock pin is cut along the XY plane. As shown in FIG. 10, the second lock pin 65 has a head 651 and a pin body 653. The head 651 is fixed to one end of the pin body 653. For example, the head 651 and the pin body 653 are integrally formed. The head 651 is disposed in the opening 521, and the pin main body 653 is disposed in the second space 523. The other end of the pin body 653 is located in the first key hole 54. An elastic member 66 shown in FIG. 3 is disposed between the head 651 and the bottom surface of the opening 521. In FIG. 3, when the head portion 651 is pushed downward in the Z direction, that is, the bottom surface side of the opening 521, the elastic member 66 contracts, and the pin main body 653 moves together with the head portion 651 downward in the Z direction.

  11 to 16 are six views showing a configuration example of the common key according to the present embodiment. FIG. 11 is a plan view, FIG. 12 is a left side view, FIG. 13 is a front view, and FIG. 15 is a rear view, and FIG. 16 is a bottom view. As shown in FIGS. 11 to 16, the common key 9 includes a shaft portion 91, a head portion 93 fixed to the shaft portion 91, and a hook receiving portion 97 fixed to the head portion 93. The axial part 91 has the end 91a and the other end 91b located in the other side of the end 91a in the axial direction. The head portion 93 is provided on the other end 91 b side of the shaft portion 91. The head 93 includes a grip portion 94 for the operator to grip and a magnet portion 95. For example, the magnet part 95 is provided on the side closer to the other end 91 b than the grip part 94. The hook receiving portion 97 is fixed to the upper surface or the side surface of the grip portion 94. The hook receiving portion 97 is provided with a through hole 97a through which the hook piece 71 is passed.

  A first key groove 92a, a second key groove 92b, a third key groove 92c, and a fourth key groove 92d are provided on the outer peripheral surface of the shaft portion 91, respectively. The first key groove 92a extends from the one end 91a in the axial direction of the shaft portion 91, that is, in the direction toward the other end 91b. The second key groove 92 b is connected to the first key groove 92 a at a position between the one end 91 a and the other end 91 b and extends in the circumferential direction of the shaft portion 91. The circumferential direction of the shaft portion 91 is a direction that intersects with the axial direction of the shaft portion 91, for example, a direction orthogonal to the axial direction. As shown in FIGS. 14 and 15, for example, the first key groove 92 a is formed on the right side surface of the shaft portion 91, and the second key groove 92 b is formed from the right side surface of the shaft portion 91 to the back surface.

  As shown in FIGS. 12 and 13, the third key groove 92 c and the fourth key groove 92 d are provided on the one end 91 a side of the shaft portion 91. For example, the third key groove 92c is formed on the front surface of the shaft portion 91, and the fourth key groove 92d is formed from the front surface to the left side surface of the shaft portion 91. The fourth key groove 92d is connected to the third key groove 92c. The circumferential length W3 of the third key groove 92c is shorter than the circumferential length W2 of the second key groove 92b. That is, W3 <W2.

  17 and 18 are diagrams showing a configuration example of the hook piece and the hook receiving unit according to the present embodiment. FIG. 17 shows a case where the hook receiving portion 97 is locked to the hook piece 71, and FIG. 18 shows a case where the hook receiving portion 97 is detached from the hook piece 71.

  As shown in FIGS. 17 and 18, the hook piece 71 is an openable and closable annular metal fitting, and is attached to the first housing 50. The hook piece 71 has an opening / closing part 71a that opens the ring of the metal fitting when the operator pushes it with a finger or the like. When the hook piece 71 is locked to the hook receiving portion 97, the operator pushes the opening / closing portion 71a with a finger or the like to open the ring, passes the opened ring through the through hole 97a of the hook receiving portion 97, and then opens and closes the opening / closing portion 71a. Release your finger to close the ring. Thereby, the worker can lock the hook piece 71 to the hook receiving portion 97. When removing the hook piece 71 from the hook receiving portion 97, the operator pushes the opening / closing portion 71a with a finger or the like to open the ring, removes the opened ring from the through hole 97a of the hook receiving portion 97, and then opens and closes the opening / closing portion 71a. Release your finger etc. to close the ring. Thereby, the operator can remove the hook piece 71 from the hook receiving part 97.

  FIG. 19 is a perspective view illustrating a configuration example of the hook portion according to the present embodiment. FIG. 20 is a cross-sectional view of the hook portion shown in FIG. 19 cut along the XZ plane. As shown in FIGS. 19 and 20, the hook portion 3 includes a second housing 31, an opening / closing hook 32, an opening / closing mechanism 40, a third lock pin 43, an elastic member 44, and a first receiving portion 49a. The second receiving portion 49b and the hook piece 48 are provided. The second casing 31, the opening / closing hook 32, the opening / closing mechanism 40, the third lock pin 43, the first receiving portion 49a, the second receiving portion 49b, and the hook piece 48 are made of a conductive material such as metal. . The configuration of the hook piece 48 is the same as the hook piece 71 shown in FIGS. 17 and 18, for example. The opening / closing hook 32, the first receiving portion 49 a, the second receiving portion 49 b, and the hook piece 48 are disposed outside the second housing 31. The opening / closing mechanism 40 and the third lock pin 43 are disposed inside the second housing 31.

  The opening / closing mechanism 40 includes a first rotation shaft 33, a first arm 34, a second rotation shaft 35, a second arm 36, a third rotation shaft 37, a third arm 38, a second screw portion 41, and An elevating part 42 is provided. The opening / closing mechanism 40 is a part that opens and closes the opening / closing hook 32 with respect to the second housing 31.

  The first rotating shaft 33 is rotatably attached to the second housing 31. Further, one end of the opening / closing hook 32 and one end of the first arm 34 are fixed to the first rotating shaft 33, respectively. Thereby, the opening / closing hook 32 and the first arm 34 are rotatable with respect to the second housing 31 around the first rotation shaft 33. For example, the opening / closing hook 32 is moved in a proximity direction FW approaching the second housing 31 and a separation direction BW moving away from the second housing 31 as the first arm 34 rotates about the first rotation shaft 33. Each can be opened and closed.

  The other end of the first arm 34 and one end of the second arm 36 are attached to the second rotating shaft 35. The second rotating shaft 35 is not fixed to the second casing 31 and the elevating part 42. The second rotating shaft 35 is supported by the elevating part 42. FIG. 21 to FIG. 23 are diagrams showing how the first arm and the second arm are attached to the second rotating shaft. 21 and 23 are views seen from the Y direction, and FIG. 22 is a view seen from the Z direction.

  As shown in FIGS. 21 to 23, the other end of the first arm 34 is provided with a slit 341 parallel to the longitudinal direction of the first arm 34. Similarly, a slit 361 parallel to the longitudinal direction of the second arm 36 is provided at one end of the second arm 36. The second rotation shaft 35 includes a shaft portion 351 and a pair of rotation plates 352 provided at both ends of the shaft portion 351 in the Y direction. The diameter of the shaft portion 351 is smaller than the widths of the slits 341 and 361, and the shaft portion 351 is passed through the slits 341 and 361, respectively. Further, the diameter of the rotating plate 352 is larger than the widths of the first arm 34 and the second arm 36. Then, both end portions of the shaft portion 351 are fixed to the center portion of the rotating plate 352, respectively. As a result, the shaft portion 351 can move in the slits 341 and 361. In the present embodiment, the second rotating shaft 35 moves relative to the first arm 34 and the second arm 36 in accordance with the lifting operation of the lifting unit 42, that is, the movement in the Z direction, and the lifting unit 42. It is also possible to move the upper surface of X in the X direction.

  Further, the other end of the second arm 36 and one end of the third arm 38 are attached to the third rotating shaft 37. The third rotating shaft 37 is not fixed to the second housing 31. The second arm 36 is rotatable about the third rotation shaft 37.

  The third arm 38 is composed of a plurality of members. 24 and 25 are side views showing a configuration example of the third arm. FIG. 24 is a view seen from the Y direction, and FIG. 25 is a view seen from the X direction. As shown in FIGS. 24 and 25, the third arm 38 includes a first portion 381, a lock piece 382, a second portion 383, an elastic member 385, and a connecting portion 386. The lock piece 382 is a part for locking the rotation of the common key 9 around the axis, and is fixed to one end of the first part 381. For example, the first portion 381 and the lock piece 382 are integrally formed. The other end of the first part 381 faces the second part 383 with the elastic member 385 interposed therebetween. The elastic member 385 is disposed between the first part 381 and the second part 383.

  One end of the connecting portion 386 is fixed to the first portion 381, and the other end of the connecting portion 386 is attached to the second portion 383 in a movable state. The second portion 383 is provided with a slit-shaped guide portion 384 parallel to the longitudinal direction of the second portion 383. The other end of the connecting portion 386 is attached to the second portion 383 so that it can move along the guide portion 384.

  For example, the connecting portion 386 includes a first bar member 386a and a second bar member 386b. The first rod-shaped member 386a and the second rod-shaped member 386b are orthogonal to each other, and one end of the first rod-shaped member 386a is fixed to the middle portion of the second rod-shaped member 386b in the longitudinal direction. That is, the first rod-shaped member 386a and the second rod-shaped member 386b are fixed in a T shape. The second rod-shaped member 386b is disposed in the second portion 383, and both ends thereof are respectively passed through slit-shaped guide portions 384. Thereby, the second rod-shaped member 386b can move along the guide portion 384. The other end of the first rod-shaped member 386a is fixed to the first portion 381. With such a structure, the first part 381 and the second part 383 are connected, and the separation distance between the first part 381 and the second part 383 can be changed. Further, the elastic member 385 is, for example, a compression coil spring, and the first rod-shaped member 386a is disposed inside the compression coil spring. With such a structure, the elastic member 385 is held between the first portion 381 and the second portion 383.

  FIG. 26 is a cross-sectional view illustrating a configuration example of the second housing. The second housing 31 is made of a conductive member such as metal. As shown in FIG. 26, the second housing 31 has a through hole 311, a screw hole 312, a second key hole 313, a first space 314, a second space 315, an opening 317, and A position restricting portion 318 is provided. As shown in FIG. 20, the second screw portion 41 is disposed in the through hole 311 and the screw hole 312. A screw groove 312 a is provided on the inner wall of the screw hole 312. Further, the third lock pin 43 is arranged in the first space 314 as shown in FIG. As shown in FIG. 26, the screw hole 312 is located on the extension line of the through hole 311 in the Z direction, and the through hole 311 and the screw hole 312 are connected via the first space portion 314. Further, as shown in FIG. 20, the first space 34, the second arm 36, the third arm 38, and the lift unit 42 are disposed in the second space 315. The common key 9 is disposed in the second key hole 313 as shown in FIG. In the X direction, the second key hole 313 is connected to the first space portion 314 and the second space portion 315, respectively. A second protrusion 31 a for preventing the common key 9 from being detached is provided on the inner wall of the second key hole 313.

  The position restricting portion 318 is a portion that restricts movement of the first portion 381 shown in FIGS. 24 and 25 in the horizontal direction, that is, the X direction and the Y direction. The position restricting portion 318 is formed so as to surround the periphery of the first portion 381 while ensuring a gap.

  FIG. 27 is a front view illustrating a configuration example of the second screw portion. FIG. 28 is a cross-sectional view of the second threaded portion shown in FIG. 27 taken along line X27-X′27. As shown in FIGS. 27 and 28, the second screw portion 41 has a cylindrical body portion 411. A screw thread 411 a is provided on the outer peripheral surface of the body portion 411. The screw thread 411a corresponds to the screw groove 312a of the screw hole 312 shown in FIG. As a result, the second screw portion 41 is screwed into the screw hole 312. In addition, a second groove portion 411b extending in the Z direction is provided on the outer peripheral surface of the body portion 411. For example, as shown in FIG. 28, the body portion 411 is provided with four second groove portions 411b. The four second groove portions 411b are arranged at equal intervals of 90 ° when viewed from the axis 411c of the body portion 411. Each of the four second groove portions 411b is formed to be larger in size than the second tip portion 435 so that a second tip portion 435 (for example, see FIG. 29) described later of the third lock pin 43 is inserted. Yes.

  29 and 30 are cross-sectional views of a portion including the third lock pin of the hook portion shown in FIG. 20 taken along the XY plane. FIG. 29 shows a case where the common key 9 is not inserted into the second key hole 313, and FIG. 30 shows a case where the common key 9 is inserted into the second key hole 313. As shown in FIGS. 29 and 30, the third lock pin 43 has an annular base portion 431, a first tip portion 433, a second tip portion 435 and a holding portion 437. The shape of the ring of the base portion 431 is, for example, a rectangle. The first tip portion 433, the second tip portion 435, and the holding portion 437 are fixed to the base portion 431, respectively.

  In the X direction, the first tip portion 433 is provided from one end of the base portion 431 toward the outside of the ring of the base portion 431. Further, in the X direction, the second tip portion 435 is provided from the other end of the base portion 431 toward the inside of the ring of the base portion 431. Further, in the X direction, the holding portion 437 is directed from the other end of the base portion 431 to the outside of the wheel of the base portion 431. The base portion 431, the first tip portion 433, the second tip portion 435, and the holding portion 437 are integrally formed. The elastic member 44 is, for example, a compression coil spring, and a holding portion 437 is disposed inside the compression coil spring. Thereby, the holding portion 437 holds the elastic member 44 while suppressing movement in the Y direction.

  As shown in FIG. 29, when the common key 9 is not inserted into the second key hole 313, the first tip portion 433 is pushed out to the second key hole 313 by the elastic member 44, and the second tip portion 435 is It is pressed against the outer peripheral surface of the second screw portion 41. At this time, if the second tip portion 435 is fitted into the second groove portion 411b, the second screw portion 41 cannot rotate about the axis. Even when the second tip portion 435 does not face the second groove portion 411b, the second groove portion 411b moves to a position facing the second tip portion 435 if the second screw portion 41 rotates around the axis. As a result, the second tip portion 435 is fitted into the second groove portion 411b, and the second screw portion 41 cannot rotate any further. As described above, when the common key is not inserted into the second key hole 313, the rotation of the second screw portion 41 is locked by the first lock pin 43.

  On the other hand, as shown in FIG. 30, when the common key 9 is inserted into the second key hole 313, the first tip 433 is pushed back to the outside of the second key hole 313 by the common key 9, and the second tip 435 moves from the inside to the outside of the second groove 411b. As indicated by the broken line arrow in FIG. 9, the elastic member 44 is pushed and contracted, and the third lock pin 43 is separated from the second screw portion 41, so that the second screw portion 41 can rotate around the axis. . As described above, when the common key 9 is inserted into the second key hole 313, the third lock pin 43 unlocks the second screw portion 41.

  FIG. 31 is a flowchart showing a procedure for attaching the short-circuit grounding device to the electric line. Moreover, FIG.32 and FIG.33 is sectional drawing which shows the procedure which attaches a short circuit grounding fixture to an electric wire path.

  As shown in FIGS. 31 to 33, the worker first rotates the first screw portion in the tightening direction (step S1). In step S <b> 1, the common key 9 is inserted into the first key hole 54, and the pin main body 653 of the second lock pin 65 is positioned in the third key groove 92 c of the common key 9. When the pin body 653 is positioned in the third keyway 92c, the common key 9 cannot rotate. That is, the common key 9 is locked by the second lock pin 65 so that it cannot rotate.

  In step S <b> 1, the first protrusion 50 a provided on the inner wall of the first key hole 54 is positioned in the second key groove 92 b of the common key 9. When the first protrusion 50a is positioned in the second keyway 92b, the common key 9 cannot move in the Z direction. That is, the common key 9 is locked by the first protrusion 50 a so that it cannot be pulled out from the first key hole 54. A hook piece 71 is attached to the hook receiving portion 97 of the common key 9 (see FIG. 17). Further, the magnet portion 95 of the common key 9 is in contact with the first housing 50 of the terminal portion 5, and the common key 9 is attached to the first housing 50 with a magnetic force. As a result, even when the pull-out lock for the common key 9 is released, the common key 9 is not easily removed from the first key hole 54.

  In step S <b> 1, the first lock pin 63 is pressed toward the elastic member 64 by the common key 9, and the first lock pin 63 is not in contact with the first screw portion 61. For this reason, the 1st screw part 61 is rotatable around an axis. Therefore, the operator rotates the first screw portion 61 in the tightening direction in a state where the ground member 99 is disposed between the pressing plate 62 and the second portion 52 of the terminal portion 5. This rotation operation may be performed manually by an operator or using a tool. As a result, the ground member 99 is sandwiched and fixed between the pressing plate 62 and the second portion 52. The ground member 99 is fixed in a state where the head 651 of the second lock pin 65 is pressed downward. For this reason, the second lock pin 65 moves downward, and the pin body 653 moves relatively from the third key groove 92c to the fourth key groove 92d. As a result, the common key 9 can be rotated. That is, the rotation lock for the common key 9 is released (step S2).

  Next, the operator removes the hook piece 71 from the hook receiving portion 97 of the common key 9 (see FIG. 18). Then, the operator rotates the common key 9 around the axis. The rotation direction of the common key 9 is a direction in which the first protrusion 50a relatively moves from the second key groove 92b to the first key groove 92a. Thereby, the common key 9 can be pulled out from the first key hole 54. That is, the extraction lock for the common key 9 is released (step S3).

  Next, the operator pulls out the common key 9 from the first key hole 54 (step S4). In the process where the common key 9 is pulled out, the first protrusion 50a relatively moves in the first key groove 92a. As shown in FIG. 8, when the common key 9 is pulled out from the first key hole 54, the first lock pin 63 is pushed by the elastic member 64 to move toward the first key hole 54, and the first lock pin 63 is moved. The second tip portion 635 contacts the first screw portion 61. Thereby, the 1st screw part 61 cannot turn. That is, the first screw portion 61 is locked so as not to rotate.

  Next, the operator inserts the common key 9 into the second key hole 313 of the hook portion 3 (step S5). The common key 9 is inserted into the second key hole 313 with the one end 91a at the top. In the process in which the common key 9 is inserted into the second key hole 313, the second protrusion 31a relatively moves in the first key groove 92a. As shown in FIG. 29, when the common key 9 is not inserted into the second key hole 313, the third lock pin 43 is in contact with the second screw portion 41, and the second screw portion 41 rotates. Is locked. On the other hand, as shown in FIG. 30, when the common key 9 is inserted into the second key hole 313, the third lock pin 43 is pressed toward the elastic member 44 by the common key 9, and the third lock pin 43 Is separated from the second screw portion 41. As a result, the second screw portion 41 can rotate. That is, the rotation lock for the second screw portion 41 is released.

  When the common key 9 is inserted all the way into the second key hole 313, the magnet portion 95 of the common key 9 comes into contact with the second housing 31 of the hook portion 3. When the magnet unit 95 comes into contact with the second housing 31, the common key 9 is attached to the second housing 31 by magnetic force. As a result, the common key 9 cannot be easily removed from the second key hole 313. Further, the lock piece 382 of the third arm 38 is disposed in the fourth key groove 92d. In this state, the common key 9 is rotated around the axis. The rotation direction of the common key 9 is a direction in which the second protrusion 31a relatively moves from the first key groove 92a to the second key groove 92b. When the second protrusion 31a moves into the second keyway 92b, the common key 9 cannot move in the Z direction. That is, the common key 9 is locked so that it cannot be pulled out from the second key hole 313 (step S6). Thereafter, the worker attaches the hook piece 48 to the hook receiving portion 97 of the common key 9.

  Next, the operator holds the electric wire 199 such as an arc horn on the opening / closing hook 32 of the hook portion 3 with the insulating rod 1 in hand. Then, the worker rotates the second screw portion 41 via the insulating rod 1. The rotation direction of the second screw portion 41 is a direction in which the second screw portion 41 is tightened (step S7). By the rotation of the second screw portion 41 in the tightening direction, the elevating unit 42 moves upward in the Z direction, and the second rotating shaft 35 moves along with the elevating unit 42 in the Z direction.

  When the second rotation shaft 35 moves upward in the Z direction, the first arm 34 rotates about the first rotation shaft 33, and the opening / closing hook 32 moves in the proximity direction FW. Thereby, the electric wire path 199 is pinched | interposed into the 1st receiving part 49a and the 2nd receiving part 49b, and the opening-and-closing arm 32 will be in the closed state. When the second rotary shaft 35 moves upward in the Z direction, the third arm 38 is pushed downward via the second arm 36 and the third rotary shaft 37, and the lock piece 382 of the third arm 38 is The fourth keyway 92d moves into the third keyway 92c. When the lock piece 382 is positioned in the third keyway 92c, the common key 9 cannot rotate. That is, the common key 9 is locked so as not to rotate (step S8).

  Note that, as shown in FIGS. 24 and 25, the position shift of the first portion 381 of the third arm 38 is restricted by the position restricting portion 318 in the X direction and the Y direction. For this reason, the first portion 381 can be guided by the position restricting portion 318 and moved along the Z direction, and the lock piece 382 is arranged with high accuracy in the third key groove 92c. Further, an elastic member 385 is disposed between the first portion 381 and the second portion 383 of the third arm 38. Even if the third arm 38 is pushed further downward after the lock piece 382 is moved to the third keyway 92c and the rotation of the common key 9 is locked, the pushing force causes the elastic member 385 to be deformed. Accumulated at. Therefore, even after the rotation of the common key 9 is locked, the operator can further close the open / close hook by rotating the second screw portion 41 in the tightening direction.

  FIG. 34 is a flowchart showing a procedure for removing the short-circuit grounding device from the electric line. FIG. 35 and FIG. 36 are cross-sectional views showing a procedure for removing the short-circuit grounding device from the electric line. As shown in FIGS. 34 to 36, the operator first operates the insulating rod 1 to rotate the second screw portion 41. The rotation direction of the second screw portion 41 is a direction in which the second screw portion 41 is loosened (step S11). By the rotation of the second screw portion 41 in the loosening direction, the elevating portion 42 moves downward in the Z direction, and the second rotating shaft 35 also moves downward in the Z direction according to gravity.

  Accordingly, the first arm 34 rotates about the first rotation shaft 33, and the opening / closing hook 32 moves in the separation direction BW away from the second housing 31. The electric wire path 199 is separated from the first receiving portion 49a and the second receiving portion 49b, and the open / close arm 32 is opened. The operator moves the insulating rod 1 and removes the hook portion 3 from the electric wire path 199. When the second rotating shaft 35 moves downward in the Z direction, the third arm 38 is lifted upward via the second arm 36 and the third rotating shaft 37, and the lock piece 382 of the third arm 38 is The third keyway 92c moves into the fourth keyway 92d. As a result, the common key 9 can be rotated. That is, the rotation lock for the common key 9 is released (step S12).

  Next, the operator removes the hook piece 48 from the hook receiving portion 97 of the common key 9. Then, the operator rotates the common key 9 around the axis. The rotation direction of the common key 9 is a direction in which the second protrusion 31a relatively moves from the second key groove 92b to the first key groove 92a. As a result, the state in which the withdrawal of the common key 9 is locked is released (step S13).

  Next, the operator pulls out the common key 9 from the second key hole 313 of the hook portion 3 (step S14). In the process where the common key 9 is pulled out, the second protrusion 31a relatively moves in the first key groove 92a. When the common key 9 is pulled out from the second key hole 313, the third lock pin 43 is pushed out to the second key hole 313 side by the elastic member 44, and the second tip portion 435 of the common key 9 is moved to the second screw portion 41. Contact. Thereby, the 2nd screw part 41 is locked so that it may not rotate.

  Next, the operator inserts the common key 9 into the first key hole 54 of the terminal portion 5 (step S15). The common key 9 is inserted into the first key hole 54 with the one end 91a at the head. When the common key 9 is inserted into the first key hole 54, the first lock pin 63 is pressed toward the elastic member 64 by the common key 9, and the first lock pin 63 is separated from the first screw portion 61. As a result, as shown in FIG. 9, the rotation lock on the first screw portion 61 is released.

  When the common key 9 is inserted all the way into the first key hole 54, the magnet portion 95 of the common key 9 comes into contact with the first housing 50 of the terminal portion 5. When the magnet unit 95 comes into contact with the first housing 50, the common key 9 is attached to the first housing 50 by a magnetic force. In this state, the common key 9 is rotated around the axis. The rotation direction of the common key 9 is a direction in which the first protrusion 50a relatively moves from the first key groove 92a to the second key groove 92b. Thereby, the common key 9 is locked so that it cannot be pulled out from the first key hole 54 (step S16).

  Next, an operator rotates the 1st screw part 61 in the direction which loosens (step 17). This rotation operation may be performed manually by an operator or using a tool. Thereby, the fixed state of the ground member 99 is released, and the terminal portion 5 can be removed from the ground member 99. When the fixed state of the ground member 99 is released, the second lock pin 65 is pushed by the elastic member 66 and moves upward in the Z direction. As a result, the pin body 653 moves from the fourth keyway 92d to the third keyway 92c, and the common key 9 is locked so as not to rotate (step S18).

  As described above, the short-circuit grounding device 100 according to this embodiment includes the insulating rod 1, the hook portion 3 attached to one end of the insulating rod 1, the terminal portion 5 attached to the ground member, and the hook portion 3. A ground wire 7 for electrically connecting the terminal portion 5 and a common key 9 inserted into the hook portion 3 and the terminal portion 5 are provided. The terminal 5 is provided in the first housing 50, the first housing 50, the first key hole 54 into which the common key 9 is inserted, and the first housing 50, which is attached to the first housing 50 and tightens the ground member 99. 1 screw part 61, the 1st lock part which locks so that rotation of the 1st screw part 61 may not be performed, and the 2nd lock part which locks so that common key 9 may not be pulled out from the 1st key hole 54. The hook part 3 is provided in the second casing 31, the second key hole 313 provided in the second casing 31, and the second screw part 41 attached to the second casing 31. The opening / closing hook 32 attached to the second housing 31 and opening / closing when the second screw portion 41 rotates, the third lock portion for locking the second screw portion 41 so as not to rotate, and the common key 9 And a fourth lock portion that locks the second key hole 313 so as not to come off. The first lock part releases the lock when the common key 9 is inserted into the first key hole 54. The second lock portion is unlocked when the first screw portion 61 tightens the ground member 99. The third lock portion releases the lock when the common key 9 is inserted into the second key hole 313. The fourth lock portion releases the lock when the opening / closing hook 32 is opened.

  According to this, the common key 9 cannot be removed from the first key hole 54 unless the terminal portion 5 tightens the ground member 99. If the common key 9 is not inserted into the second key hole 313, the opening / closing hook 32 cannot be opened / closed. That is, the opening / closing hook 32 cannot be opened / closed unless the terminal portion 5 fastens the ground member 99. For this reason, it can prevent that the error arises in the attachment procedure with respect to the electric wire path 199. FIG.

  If the opening / closing hook 32 is not open, the common key 9 cannot be removed from the second key hole 313. If the common key 9 is not inserted into the first key hole 54, the terminal portion 5 cannot loosen the ground member 99. That is, if the opening / closing hook 32 is not opened, the terminal portion 5 cannot loosen the ground member 99. For this reason, it can prevent that the error arises in the removal procedure with respect to the electric wire path 199. FIG.

  The common key 9 has a shaft portion 91 having a first key groove 92a and a second key groove 92b formed on the outer peripheral surface. The first key groove 92a extends in the axial direction from one end 91a of the shaft portion 91 toward the other end 91b. The second key groove 92 b is connected to the first key groove 92 a and extends in the circumferential direction of the shaft portion 91. According to this, the 1st keyway 92a can be made to oppose the inner wall predetermined position (for example, the 1st projection part 50a or the 2nd projection part 31a) of the 1st key hole 54 or the 2nd key hole 313. FIG. Further, by rotating the shaft portion 91 in the axial direction, the second key groove 92b can be opposed to the predetermined position on the inner wall.

  Further, the second lock portion has a first protrusion 50 a that protrudes from the inner wall of the first key hole 54 toward the central portion of the first key hole 54 in the diameter direction. When the shaft portion 91 is inserted into the first key hole 54, the first protrusion 50a is located inside the first key groove 92a or inside the second key groove 92b. As the shaft portion 91 rotates around the shaft, the first protrusion 50a relatively moves from one of the first key groove 92a and the second key groove 92b to the other. According to this, when the 1st projection part 50a is located inside the 1st keyway 92a, the axial part 91 can move to an axial direction. Moreover, when the 1st projection part 50a is located inside the 2nd keyway 92b, the axial part 91 cannot move to an axial direction.

  Further, the fourth lock portion has a second protrusion 31 a that protrudes from the inner wall of the second key hole 313 toward the central portion of the second key hole 313 in the diameter direction. When the shaft portion 91 is inserted into the second key hole 313, the second protrusion 31a is positioned inside the first key groove 92a or inside the second key groove 92b. As the shaft portion 91 rotates around the shaft, the second protrusion 31a relatively moves from one of the first key groove 92a and the second key groove 92b to the other. According to this, when the 2nd projection part 31a is located inside the 1st keyway 92a, the axial part 91 can move to an axial direction. Moreover, when the 2nd protrusion part 31a is located inside the 2nd keyway 92b, the axial part 91 cannot move to an axial direction.

  A first groove portion 611 b extending in the axial direction of the first screw portion 61 is formed on the outer peripheral surface of the first screw portion 61. The first lock portion has a first lock pin 63 that locks rotation around the axis of the first screw portion 61 by being arranged inside the first groove portion 611b. When the common key 9 is inserted into the first key hole 54, the first lock pin 63 moves from the inside to the outside of the first groove portion 611b. According to this, when the common key 9 is inserted into the first key hole 54, the rotation lock on the first screw portion 61 can be released. A third key groove 92c having a shorter length in the circumferential direction than the second key groove 92b is formed on the outer peripheral surface of the shaft portion 91. The second lock portion has a second lock pin 65 that locks rotation around the shaft of the shaft portion 91 by being arranged inside the third keyway 92c. When the first screw portion 61 tightens the ground member 99, the second lock pin 65 moves from the inside to the outside of the third key groove 92c. According to this, the rotation lock with respect to the common key 9 can be released by the first screw portion 61 tightening the ground member 99.

  A second groove portion 411 b extending in the axial direction of the second screw portion 41 is formed on the outer peripheral surface of the second screw portion 41. The third lock portion has a third lock pin 43 that locks rotation around the axis of the second screw portion 41 by being arranged inside the second groove portion 411b. When the common key 9 is inserted into the second key hole 313, the third lock pin 43 moves from the inside to the outside of the second groove portion 411b. According to this, the rotation lock with respect to the 2nd screw part 41 can be cancelled | released by inserting the common key 9 in the 2nd key hole 313. FIG.

  At least a part of the common key 9 is made of a magnet. According to this, the common key 9 can be attached to the first casing 50 or the second casing 31 by magnetic force.

  In the present embodiment, the first lock pin 63 and the elastic member 64 correspond to the “first lock portion” of the present invention. The first protrusion 50a, the second lock pin 65, and the elastic member 66 correspond to the “second lock portion” of the present invention. The third lock pin 43 and the elastic member 44 correspond to the “third lock portion” of the present invention. The second protrusion 31a and the lock piece 382 correspond to the “fourth lock portion” of the present invention.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. For example, in the said embodiment, although the rectangle was shown as the shape of the ring | wheel of the base parts 431 and 631, respectively, it is not limited to a rectangle and circular etc. may be sufficient. Moreover, although the compression coil spring was shown as the elastic members 44, 64, 66, and 385, respectively, it is not limited to a compression coil spring, Rubber may be used. Furthermore, not only the magnet part 95 but the holding part 94 for an operator to hold | grip the head 93 may also be a magnet. That is, the entire head 93 may be a magnet.

DESCRIPTION OF SYMBOLS 1 Insulating rod 3 Hook part 5 Terminal part 7 Ground wire 9 Common key 11 Insulating bar main body 31 2nd housing | casing 31a 2nd projection part 32 Opening / closing hook 33 1st rotating shaft 34 1st arm 35 2nd rotating shaft 36 2nd arm 37 Third rotating shaft 38 Third arm 40 Opening / closing mechanism 41 Second screw part 42 Lifting part 43 Third lock pin 44 Elastic member 48 Hook piece 49a First receiving part 49b Second receiving part 50 First housing 50a First protrusion Part 51 first part 52 second part 53 third part 54 first key hole 55 third space part 61 first screw part 62 pressing plate 63 first lock pin 64 elastic member 65 second lock pin 66 elastic member 71 hook piece 71a Opening / closing part 91 Shaft part 91a One end 91b Other end 92a First key groove 92b Second key groove 92c Third key groove 92d Fourth key groove 93 Head 94 Grip part 95 Magnet part 97 Hook receiving part 97a Through hole 99 Grounding member 100 Short-circuit grounding device 199 Electric wire path 311 Through hole 312 Screw hole 312a Screw groove 313 Second key hole 314 First space portion 315 Second space portion 317 Opening portion 318 Position restricting portion 341 Slit 351 Shaft portion 352 Rotation Plate 361 Slit 381 First portion 382 Lock piece 383 Second portion 384 Guide portion 385 Elastic member 386 Connection portion 386a First rod-like member 386b Second rod-like member 411 Trunk portion 411a Screw thread 411b Second groove portion 411c Shaft center 431 Base portion 433 First tip portion 435 Second tip portion 437 Holding portion 511 Through hole 513 Screw hole 513a Screw groove 515 First space portion 521 Opening portion 523 Second space portion 611 Body portion 611a Screw thread 611b First groove portion 611c Axis center 613 Head 631 Base portion 633 First tip portion 635 Second tip portion 6 37 Holding part 651 Head 653 Pin body BW Separation direction FW Proximity direction

Claims (10)

An insulating rod;
A hook portion attached to one end of the insulating rod;
A terminal portion attached to the ground member;
A ground wire that electrically connects the hook portion and the terminal portion;
A common key that can be inserted into the hook part and the terminal part,
When the common key is inserted into the terminal portion, the terminal portion can be fixed to the ground member;
The common key can be pulled out from the terminal part when the terminal part is fixed to the ground member;
The hook part can be opened and closed when the common key is inserted into the hook part,
The short-circuit grounding device, wherein the common key can be pulled out from the hook portion when the hook portion is open. An insulating rod;
A hook portion attached to one end of the insulating rod;
A terminal portion attached to the ground member;
A ground wire that electrically connects the hook portion and the terminal portion;
A common key inserted into each of the hook part and the terminal part,
The terminal portion is
A first key hole into which the common key is inserted;
A first screw part for fastening the ground member,
The first screw portion is rotatable when the common key is inserted into the first key hole,
The common key can be pulled out from the first key hole when the first screw portion is tightening the ground member,
The hook part is
A second key hole into which the common key is inserted;
A second threaded portion;
An opening / closing hook that opens and closes when the second screw portion rotates,
The second screw portion is rotatable when the common key is inserted into the second key hole,
The common key can be pulled out of the second key hole when the opening / closing hook is open. The terminal portion is
A first lock portion for locking the first screw portion so as not to rotate;
A second lock portion for locking the common key so as not to come out of the first key hole;
The hook part is
A third lock portion for locking the second screw portion so as not to rotate;
A fourth lock portion for locking the common key so as not to come out of the second key hole;
The first lock part is unlocked when the common key is inserted into the first key hole,
The second lock portion is unlocked when the first screw portion tightens the ground member,
The third lock portion unlocks when the common key is inserted into the second key hole,
The short-circuit grounding device according to claim 2, wherein the fourth lock portion releases the lock when the opening / closing hook is opened. The common key is
A shaft portion having a first key groove and a second key groove formed on the outer peripheral surface;
The first keyway extends in the axial direction from one end of the shaft portion to the other end,
4. The short-circuit grounding device according to claim 3, wherein the second key groove is connected to the first key groove and extends in a circumferential direction of the shaft portion. The second lock portion is
A first protrusion protruding from an inner wall of the first key hole toward a central portion of the first key hole in a diameter direction;
When the shaft portion is inserted into the first key hole, the first protrusion is located inside the first key groove or the second key groove,
5. The short-circuit grounding device according to claim 4, wherein the first protrusion moves relative to one of the first key groove and the second key groove as the shaft portion rotates about the shaft. The fourth lock part is
A second protrusion protruding from the inner wall of the second key hole toward the diametrical center of the second key hole;
When the shaft portion is inserted into the second key hole, the second protrusion is located inside the first key groove or inside the second key groove,
The said 2nd projection part moves relatively from one side of the said 1st keyway and the said 2nd keyway to the other by the said shaft part rotating around an axis | shaft, The Claim 4 or Claim 5 of Claim 5 Short-circuit grounding equipment. On the outer peripheral surface of the first screw part, a first groove part extending in the axial direction of the first screw part is formed,
The first lock part has a first lock pin that locks rotation around the axis of the first screw part by being arranged inside the first groove part,
6. The short circuit according to claim 3, wherein when the common key is inserted into the first key hole, the first lock pin moves from the inside to the outside of the first groove portion. Grounding equipment. A third key groove having a shorter length in the circumferential direction than the second key groove is formed on the outer peripheral surface of the shaft portion.
The second lock portion has a second lock pin that locks rotation around the axis of the shaft portion by being arranged inside the third keyway,
6. The short-circuit grounding device according to claim 4, wherein the second lock pin moves from the inside to the outside of the third keyway when the first screw portion tightens the ground member. A second groove portion extending in the axial direction of the second screw portion is formed on the outer peripheral surface of the second screw portion,
The third lock part has a third lock pin that locks rotation around the axis of the second screw part by being arranged inside the second groove part,
7. The short-circuit grounding device according to claim 3, wherein the third lock pin moves from the inside to the outside of the second groove when the common key is inserted into the second key hole.   The short-circuit grounding device according to any one of claims 1 to 9, wherein at least a part of the common key is a magnet.

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