JP6819191B2 - Short circuit grounding equipment - Google Patents

Description

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

Inspections and electrical work on electric lines such as transmission lines are carried out with the inspection points and construction points in a power outage state, but induced currents may be induced in the electric lines even during power outage work. Therefore, the worker uses the earth hook to perform the work (see, for example, Patent Documents 1 to 3). The earth hook is a short-circuit grounding device, and is an insulating rod (operating rod), a metal hook member that is pivotally supported at the tip of the insulating rod, and an opening / closing that opens and closes the hook member by operating the operating means. It is equipped with a mechanism and a ground wire with a grounding bracket connected to a hook member.

Japanese Unexamined Patent Publication No. 2010-35305 Japanese Unexamined Patent Publication No. 2012-39679 Japanese Unexamined Patent Publication No. 2013-26071

As a procedure for attaching the ground hook, the operator needs to attach the ground hook to the electric line after attaching the ground fitting to the ground plate or the like. Further, as a procedure for removing the ground hook, the operator needs to remove the ground fitting from the ground plate or the like after removing the ground hook from the electric line. However, the operator may make a mistake in the procedure for attaching or 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 for an electric line and is operated according to a removal procedure.

The short-circuit grounding device according to one aspect of the present invention electrically has 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 wire to be connected and a common key that can be inserted into the hook portion and the terminal portion are provided, and the terminal portion is fixed to the ground member when the common key is inserted into the terminal portion. It is possible, 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 opens and closes when the common key is inserted into the hook portion. It is possible, and 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. Further, if the hook portion is not open, the terminal portion cannot be separated from the ground member.

The short-circuit grounding device according to one aspect of the present invention electrically has 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 wire to be connected and a common key to be inserted into the hook portion and the terminal portion are provided, and the terminal portion has a first key hole into which the common key is inserted and a first key hole for tightening the ground member. It has one screw portion, and the first screw portion is rotatable when the common key is inserted into the first key hole, and the common key has the first screw portion. It can be pulled out from the first key hole when the ground member is tightened, and the hook portion is such that the second key hole into which the common key is inserted, the second screw portion, and the second screw portion rotate. The second screw portion has an opening / closing hook that opens / closes by opening and closing, and the second screw portion can rotate when the common key is inserted into the second key hole, and the common key opens / closes. It can be pulled out from the second key hole when the hook is open. According to this, the opening / closing hook cannot open / close unless the terminal portion tightens the ground member. Further, if the opening / closing hook is not open, the terminal portion cannot loosen the tightening of 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 has 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 portion is unlocked when the common key is inserted into the second key hole, and the fourth lock portion is unlocked when the opening / closing hook is opened. According to this, if the terminal portion does not tighten the ground member, the common key cannot be removed from the first key hole, so that the opening / closing hook cannot be opened / closed. Further, 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 tightening of the ground member.

As a desirable 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 key groove is connected to the first key groove and extends in the circumferential direction of the shaft portion. According to this, the first key groove can be made to face a predetermined position on the inner wall of the first key hole or the second 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 desirable aspect of the present invention, the second lock portion has a first protrusion portion that protrudes from the inner wall of the first key hole toward the center portion in the radial direction of the first key hole, and the shaft portion. Is inserted into the first keyhole, the first protrusion is located inside the first keyway or inside the second keyway, and the shaft rotates about an axis. , The first protrusion moves relatively from one of the first keyway and the second keyway to the other. According to this, when the first protrusion is located inside the first keyway, the shaft can move in the axial direction. Further, when the first protrusion is located 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 the inner wall of the second key hole toward the center portion in the radial direction of the second key hole, and the shaft portion has the shaft portion. When inserted into the second keyhole, the second protrusion is located inside the first keyway or inside the second keyway, and the shaft rotates about an axis. The second protrusion moves relatively from one of the first keyway and the second keyway to the other. According to this, when the second protrusion is located inside the first keyway, the shaft can move in the axial direction. Further, when the second protrusion is located inside the second keyway, the shaft cannot move in the axial direction.

As a desirable aspect of the present invention, a first groove portion extending in the axial direction of the first screw portion is formed on the outer peripheral surface of the first screw portion, and the first lock portion is the first lock portion. The first lock pin has a first lock pin that locks the rotation of the first screw portion around an axis by being arranged inside the groove portion, and the common key is inserted into the first key hole of the first lock pin. Then, it moves from the inside to the outside of the first groove portion. 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 desirable aspect of the present invention, on the outer peripheral surface of the shaft portion, a third key groove having a shorter circumferential length than the second key groove and the third key groove in the axial direction of the shaft portion are formed. Along with being connected, a fourth key groove provided at one end of the shaft portion and having a length in the circumferential direction longer than the third key groove is formed, and the second lock portion is the second lock portion. The second lock pin has a second lock pin that locks the rotation of the shaft portion around the axis by being arranged inside the three keyways, and the second lock pin is when the first screw portion tightens the ground member. moves to the third key groove or al the fourth keyway. According to this, when the first screw portion tightens the ground member, the rotation lock on the common key is released.

As a desirable aspect of the present invention, 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, and the third lock portion is formed by the second lock portion. The third lock pin has a third lock pin that locks the rotation of the second screw portion around the axis by being arranged inside the groove portion, and the common key is inserted into the second key hole of the third lock pin. Then, it moves from the inside to the outside of the second groove portion. 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 preferred embodiment of the present invention, at least a part of the common key is a magnet. According to this, the common key can be magnetically attached to the first housing or the second housing.

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

FIG. 1 is a diagram showing a configuration example of a short-circuit grounding device according to the present embodiment. FIG. 2 is a perspective view showing a configuration example of a 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 showing a configuration example of the first housing. FIG. 5 is a front view showing 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 the line X5-X'5. FIG. 7 is a plan view showing a configuration example of the first lock pin according to the present embodiment. FIG. 8 is a cross-sectional view of the terminal portion shown in FIG. 2, in which the first portion including the first lock pin is cut along the XY plane. FIG. 9 is a cross-sectional view of the terminal portion shown in FIG. 2, in which the first portion including the first lock pin is cut along the XY plane. FIG. 10 is a cross-sectional view of the terminal portion shown in FIG. 2, in which the second portion including the second lock pin is cut along the XY plane. FIG. 11 is a plan view showing a configuration example of a common key according to the present embodiment. FIG. 12 is a left side view showing a configuration example of the common key according to the present embodiment. FIG. 13 is a front view showing a configuration example of a common key according to the present embodiment. FIG. 14 is a right side view showing a configuration example of the common key according to the present embodiment. FIG. 15 is a rear view showing a configuration example of a common key according to the present embodiment. FIG. 16 is a bottom view showing a configuration example of a common key according to the present embodiment. FIG. 17 is a diagram showing a configuration example of a hook piece and a hook receiving portion according to the present embodiment. FIG. 18 is a diagram showing a configuration example of a hook piece and a hook receiving portion according to the present embodiment. FIG. 19 is a perspective view showing 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 showing a mounting state of the first arm and the second arm with respect to the second rotating shaft. FIG. 22 is a diagram showing a mounting state of the first arm and the second arm with respect to the second rotating shaft. FIG. 23 is a diagram showing a mounting state of the first arm and the second arm with respect to the second rotating 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 showing a configuration example of the second housing. FIG. 27 is a front view showing a configuration example of the second screw portion. FIG. 28 is a cross-sectional view of the second screw portion shown in FIG. 27 cut along the line X27-X'27. FIG. 29 is a cross-sectional view of the hook portion shown in FIG. 20 in which the portion including the third lock pin is cut in the XY plane. FIG. 30 is a cross-sectional view of a portion of the hook portion shown in FIG. 20 including the third lock pin, cut along an 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 line.

Embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the contents described in the present embodiment. In addition, the components described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the components described below can be combined as appropriate.

FIG. 1 is a diagram showing a configuration example of a short-circuit grounding device according to the present embodiment. When performing power outage work at a power generation / substation or power outage work at a transmission line, it is necessary to take measures to prevent electric shock in order to ensure the safety of workers. To reduce the risk of electric shock due to erroneous energization, contact with other electric lines or electric wires (hereinafter referred to as electric lines), or induction from other electric lines, for example, use a short-circuit grounding device called an earth hook to ensure Must be short-circuit grounded.

As shown in FIG. 1, the short-circuit grounding device 100 according to the present embodiment includes an insulating rod 1, a hook portion 3, a terminal portion 5, a ground wire 7, and a common key 9. When performing power outage work in electrical equipment, the operator fixes the terminal part 5 to the grounding means (grounding point) and the hook part 3 to the grounding place (electrical inflow end) such as the bus bus of the electric line. As a result, it is short-circuited and grounded. Electric lines are conductors that can be induced by induced currents, including substations, power transmission lines and their supports (steel towers, insulators, etc.), and ancillary equipment. 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 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 showing a configuration example of a 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 shown in FIG. 1 and the ground member. Examples of the grounding member include a driving grounding rod (not shown) driven into the ground, a metal plate connected to the driving grounding 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. It includes 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. .. 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 in the Z direction. Further, in a plane orthogonal to the Z direction, the direction in which the first lock pin 63 moves and the direction in which the third lock pin 43 (see, for example, FIG. 20) described later of the hook portion 3 moves are defined as the X direction, respectively. .. The direction orthogonal to the Z direction and the X direction is defined as the Y direction.

FIG. 4 is a cross-sectional view showing a configuration example of the first housing. As shown in FIG. 4, the first housing 50 connects the first part 51, the second part 52 facing the first part 51 in the Z direction, and the third part 51 and the second part 52. It has a site 53 and. 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 the through hole 511 in the Z direction. Further, 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 an extension in the X direction and the Y direction. As shown in FIG. 3, the first screw portion 61 is passed through the through hole 511 and the screw hole 513. A screw groove 513a is provided on the inner wall of the screw hole 513. Further, as shown in FIG. 3, a first lock pin 63 is arranged in the first space portion 515.

The second portion 52 is provided with an opening 521 opened on the side of the first portion 51 and a second space portion 523 connected to the opening 521. An opening 521 is provided at a position overlapping the screw hole 513 in the Z direction. Further, the second space portion 523 is a space having an extension in the X direction and the Y direction. A second lock pin 65 is arranged in the opening 521 and the second space 523 as shown in FIG.

Further, 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. Further, the inner wall of the first key hole 54 is provided with a first protrusion 50a for preventing the key from coming off. In the present embodiment, the ground member is arranged in the third space portion 55 located between the screw hole 513 and the opening 521 in the Z direction.

FIG. 5 is a front view showing 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 the line X5-X'5. As shown in FIGS. 5 and 6, the first screw portion 61 has a cylindrical body portion 611 and a head portion 613 provided at one end of the body portion 611. A screw thread 611a is provided on the outer peripheral surface of the body portion 611. The thread 611a corresponds to the thread 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. Further, 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 ° with respect to the axial center 611c of the body portion 611. Each of the four first groove portions 611b is formed to be larger in size than the second tip portion 635 so that the second tip portion 635 (for example, see FIG. 7) described later of the first lock pin 63 can be inserted. There is.

FIG. 7 is a plan view showing 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 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 ring 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. Further, the elastic member 64 is, for example, a compression coil spring, and a holding portion 637 is arranged inside the compression coil spring. As a result, the holding portion 637 holds the elastic member 64 while suppressing its movement in the Y direction.

8 and 9 are cross-sectional views of the terminal portion shown in FIG. 2, in which the first portion including the first lock pin is cut in the XY plane. FIG. 8 shows a case where the common key is not inserted in the first key hole 54, and FIG. 9 shows a case where the common key 9 is inserted in the first key hole 54. As shown in FIG. 8, when the common key 9 is not inserted into the first key hole 54, the elastic member 64 pushes the first tip portion 633 to the first key hole 54, and the second tip portion 635 It is pressed against the outer peripheral surface of the first screw portion 61. At this time, if the second tip portion 635 fits into the first groove portion 611b, the first screw portion 61 cannot rotate about the axis. Even if the second tip portion 635 does not face the first groove portion 611b, if the first screw portion 61 rotates about the axis, the first groove portion 611b moves to a position facing the second tip portion 635. 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. As described above, 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 common key 9 pushes the first tip portion 633 back to the outside of the first key hole 54, and the second tip portion The 635 moves from the inside to the outside of the first groove portion 611b. As shown by the broken line arrow in FIG. 9, since the elastic member 64 is contracted and the first lock pin 63 is separated from the first screw portion 61, the first screw portion 61 can rotate about the axis. By inserting the common key 9 into the first key hole 54 in this way, the first lock pin 63 releases the lock on the first screw portion 61.

FIG. 10 is a cross-sectional view of the terminal portion shown in FIG. 2, in which the 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 portion 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 arranged in the opening 521, and the pin body 653 is arranged in the second space 523. The other end of the pin body 653 is located in the first key hole 54. The elastic member 66 shown in FIG. 3 is arranged between the head head 651 and the bottom surface of the opening 521. In FIG. 3, when the head 651 is pushed to the lower side in the Z direction, that is, to the bottom surface side of the opening 521, the elastic member 66 contracts, and the pin body 653 moves downward in the Z direction together with the head 651.

11 to 16 are six views showing a configuration example of a 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. 14 is a right side view. 15 is a rear view, and FIG. 16 is a bottom view. As shown in FIGS. 11 to 16, the common key 9 has 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 shaft portion 91 has one end 91a and the other end 91b located on the opposite side of the one end 91a in the axial direction thereof. The head portion 93 is provided on the other end 91b side of the shaft portion 91. The head 93 has a grip portion 94 for the operator to grip and a magnet portion 95. For example, the magnet portion 95 is provided on the side closer to the other end 91b than the grip portion 94. The hook receiving portion 97 is fixed to the upper surface or the side surface of the grip portion 94. Further, the hook receiving portion 97 is provided with a through hole 97a for passing the hook piece 71.

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 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 92b is connected to the first key groove 92a at a position between one end 91a and the other end 91b, and extends in the circumferential direction of the shaft portion 91. The circumferential direction of the shaft portion 91 is a direction that intersects the axial direction of the shaft portion 91, for example, a direction that is orthogonal to the axial direction. As shown in FIGS. 14 and 15, for example, the first key groove 92a is formed on the right side surface of the shaft portion 91, and the second key groove 92b is formed from the right side surface to the back surface of the shaft portion 91.

As shown in FIGS. 12 and 13, the third key groove 92c and the fourth key groove 92d are provided on one end 91a 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 keyway 92d is connected to the third keyway 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 views showing a configuration example of a hook piece and a hook receiving portion 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 removed from the hook piece 71.

As shown in FIGS. 17 and 18, the hook piece 71 is an annular metal fitting that can be opened and closed, and is attached to the first housing 50. The hook piece 71 has an opening / closing portion 71a in which the ring of the metal fitting is opened 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 passes the opening / closing portion 71a. Release your finger from and close the ring. As a result, the operator 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 removes the opening / closing portion 71a. Release your finger from and close the ring. As a result, the operator can remove the hook piece 71 from the hook receiving portion 97.

FIG. 19 is a perspective view showing 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. , A second receiving portion 49b and a hook piece 48 are provided. The second housing 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 that of the hook piece 71 shown in FIGS. 17 and 18, for example. The opening / closing hook 32, the first receiving portion 49a, the second receiving portion 49b, and the hook piece 48 are arranged outside the second housing 31. The opening / closing mechanism 40 and the third lock pin 43 are arranged inside the second housing 31.

The opening / closing mechanism 40 includes a first rotating shaft 33, a first arm 34, a second rotating shaft 35, a second arm 36, a third rotating shaft 37, a third arm 38, a second screw portion 41, and the like. It has an elevating part 42. The opening / closing mechanism 40 is a portion for opening / closing 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. As a result, the opening / closing hook 32 and the first arm 34 can rotate about the first rotating shaft 33 with respect to the second housing 31. For example, the opening / closing hook 32 has a proximity direction FW approaching the second housing 31 and a separation direction BW moving away from the second housing 31 by rotating the first arm 34 around 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 housing 31 and the elevating portion 42. The second rotating shaft 35 is supported by the elevating portion 42. 21 to 23 are views showing the mounting state of the first arm and the second arm with respect to the second rotating shaft. 21 and 23 are views viewed from the Y direction, and FIG. 22 is a view viewed from the Z direction.

As shown in FIGS. 21 to 23, a slit 341 parallel to the longitudinal direction of the first arm 34 is provided at the other end of the first arm 34. Similarly, one end of the second arm 36 is provided with a slit 361 parallel to the longitudinal direction of the second arm 36. Further, the second rotating shaft 35 has a shaft portion 351 and a pair of rotating 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 width of each of the first arm 34 and the second arm 36. Both ends of the shaft portion 351 are fixed to the central 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 response to the elevating operation of the elevating portion 42, that is, the movement in the Z direction, and the elevating portion 42 It is also possible to move the upper surface of the 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 has 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 portion for locking the rotation of the common key 9 around the axis, and is fixed to one end of the first portion 381. For example, the first portion 381 and the lock piece 382 are integrally formed. Further, the other end of the first portion 381 faces the second portion 383 via the elastic member 385. The elastic member 385 is arranged between the first portion 381 and the second portion 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 movably attached to the second portion 383. 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 has a first rod-shaped member 386a and a second rod-shaped 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 an intermediate portion in the longitudinal direction of the second rod-shaped member 386b. That is, the first rod-shaped member 386a and the second rod-shaped member 386b are fixed in a T shape. Further, the second rod-shaped member 386b is arranged in the second portion 383, and both ends thereof are passed through the slit-shaped guide portion 384, respectively. As a result, the second rod-shaped member 386b can move along the guide portion 384. Further, 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 arranged 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 showing 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 and a screw hole 312, a second key hole 313, a first space portion 314, a second space portion 315, an opening 317, and the like. A position regulation unit 318 is provided. A second screw portion 41 is arranged in the through hole 311 and the screw hole 312 as shown in FIG. A screw groove 312a is provided on the inner wall of the screw hole 312. Further, as shown in FIG. 20, a third lock pin 43 is arranged in the first space portion 314. 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 to each other via the first space portion 314. Further, as shown in FIG. 20, the first arm 34, the second arm 36, the third arm and 38, and the elevating portion 42 are arranged in the second space portion 315. A common key 9 is arranged 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. Further, the inner wall of the second key hole 313 is provided with a second protrusion 31a for preventing the common key 9 from being detached.

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

FIG. 27 is a front view showing a configuration example of the second screw portion. FIG. 28 is a cross-sectional view of the second screw portion shown in FIG. 27 cut along the line X27-X'27. As shown in FIGS. 27 and 28, the second threaded portion 41 has a cylindrical body portion 411. A screw thread 411a is provided on the outer peripheral surface of the body portion 411. The thread 411a corresponds to the thread 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. Further, 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 ° with respect to the axial center 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 the second tip portion 435 (see, for example, FIG. 29) described later of the third lock pin 43 can be inserted. There is.

29 and 30 are cross-sectional views taken along the XY plane of the portion of the hook portion shown in FIG. 20 including the third lock pin. FIG. 29 shows a case where the common key 9 is not inserted in the second key hole 313, and FIG. 30 shows a case where the common key 9 is inserted in 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 ring 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. Further, the elastic member 44 is, for example, a compression coil spring, and a holding portion 437 is arranged inside the compression coil spring. As a result, the holding portion 437 holds the elastic member 44 while suppressing its 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 elastic member 44 pushes the first tip portion 433 to the second key hole 313, and the second tip portion 435 It is pressed against the outer peripheral surface of the second screw portion 41. At this time, if the second tip portion 435 fits into the second groove portion 411b, the second screw portion 41 cannot rotate about the axis. Further, even when the second tip portion 435 does not face the second groove portion 411b, if the second screw portion 41 rotates around the axis, the second groove portion 411b moves to a position facing the second tip portion 435. As a result, the second tip portion 435 fits 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 common key 9 pushes the first tip portion 433 back to the outside of the second key hole 313, and the second tip portion The 435 moves from the inside to the outside of the second groove portion 411b. As shown by the dashed 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 about the axis. .. By inserting the common key 9 into the second key hole 313 in this way, the third lock pin 43 releases the lock on the second screw portion 41.

FIG. 31 is a flowchart showing a procedure for attaching the short-circuit grounding device to the electric line. 32 and 33 are cross-sectional views showing a procedure for attaching the short-circuit grounding device to the electric line.

As shown in FIGS. 31 to 33, the operator first rotates the first screw portion in the tightening direction (step S1). In step S1, the common key 9 is inserted into the first key hole 54, and the pin body 653 of the second lock pin 65 is located in the third key groove 92c of the common key 9. When the pin body 653 is located 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.

Further, in step S1, the first protrusion 50a provided on the inner wall of the first key hole 54 is located in the second key groove 92b of the common key 9. When the first protrusion 50a is located 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 50a so that it cannot be pulled out from the first key hole 54. Further, 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 magnetically attached to the first housing 50. As a result, even when the pull-out lock for the common key 9 is released, the common key 9 cannot be easily pulled out from the first key hole 54.

In step S1, 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. Therefore, the first screw portion 61 is rotatable around the axis. Therefore, the operator rotates the first screw portion 61 in the tightening direction with the ground member 99 arranged between the pressing plate 62 and the second portion 52 of the terminal portion 5. This rotation work may be performed manually by the operator or may be performed 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 portion 651 of the second lock pin 65 is pressed downward. Therefore, 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 on 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. As a result, the common key 9 can be pulled out from the first key hole 54. That is, the pull-out 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 of pulling out the common key 9, the first protrusion 50a moves relatively 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 and moves toward the first key hole 54, and the first lock pin 63 The second tip portion 635 of the above comes into contact with the first screw portion 61. As a result, the first screw portion 61 cannot rotate. 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 one end 91a at the head. In the process of inserting the common key 9 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 rotation of the second screw portion 41 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 pressed. Is separated from the second screw portion 41. As a result, the second screw portion 41 can rotate. That is, the rotation lock on 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 portion 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 arranged in the fourth keyway 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). After that, the operator attaches the hook piece 48 to the hook receiving portion 97 of the common key 9.

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

When the second rotating shaft 35 moves upward in the Z direction, the first arm 34 rotates about the first rotating shaft 33, and the opening / closing hook 32 moves in the proximity direction FW. As a result, the electric line 199 is sandwiched between the first receiving portion 49a and the second receiving portion 49b, and the opening / closing arm 32 is in a closed state. Further, when the second rotating shaft 35 moves upward in the Z direction, the third arm 38 is pushed downward via the second arm 36 and the third rotating shaft 37, and the lock piece 382 of the third arm 38 becomes the third. It moves from the 4 key groove 92d into the 3rd key groove 92c. When the lock piece 382 is located 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).

As shown in FIGS. 24 and 25, the position of the first portion 381 of the third arm 38 is regulated by the position regulating unit 318 in the X direction and the Y direction. Therefore, the first portion 381 can be guided by the position regulating portion 318 and moved along the Z direction, and the lock piece 382 is arranged in the third key groove 92c with high accuracy. Further, an elastic member 385 is arranged 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 moves to the third key groove 92c and the rotation of the common key 9 is locked, the pushing force deforms the elastic member 385. Is accumulated in. Therefore, even after the rotation of the common key 9 is locked, the operator can further close the opening / closing 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. 35 and 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 the direction in which the second screw portion 41 loosens (step S11). Due to 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.

As a result, 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 line 199 is separated from the first receiving portion 49a and the second receiving portion 49b, and the opening / closing arm 32 is in an open state. The operator moves the insulating rod 1 to remove the hook portion 3 from the electric line 199. Further, 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 seconded. It moves from the 3 key groove 92c into the 4th key groove 92d. As a result, the common key 9 can be rotated. That is, the rotation lock on 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 of pulling out the common key 9, 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 elastic member 44 pushes the third lock pin 43 toward the second key hole 313, and the second tip portion 435 of the common key 9 becomes the second screw portion 41. Contact. As a result, the second screw portion 41 is locked so as not to 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 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 portion 95 comes into contact with the first housing 50, the common key 9 is attached to the first housing 50 by 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. As a result, the common key 9 is locked so that it cannot be pulled out from the first key hole 54 (step S16).

Next, the operator rotates the first screw portion 61 in the loosening direction (step 17). This rotation work may be performed manually by the operator or may be performed using a tool. As a result, 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 key groove 92d to the third key groove 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 the present embodiment includes an insulating rod 1, a hook portion 3 attached to one end of the insulating rod 1, a terminal portion 5 attached to the ground member, and a 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 portion 5 is provided in the first housing 50 and the first housing 50, and is attached to the first key hole 54 into which the common key 9 is inserted and the first housing 50 to tighten the ground member 99. It has a 1-thread portion 61, a first lock portion that locks the first screw portion 61 so as not to rotate, and a second lock portion that locks the common key 9 so as not to come out of the first key hole 54. The hook portion 3 includes a second housing 31, a second key hole 313 provided in the second housing 31 into which the common key 9 is inserted, and a second screw portion 41 attached to the second housing 31. , An opening / closing hook 32 attached to the second housing 31 that opens and closes when the second screw portion 41 rotates, a third lock portion that locks the second screw portion 41 so as not to rotate, and a common key 9. It has a fourth lock portion that locks the second key hole 313 so as not to come off. The first lock portion unlocks 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 unlocks when the common key 9 is inserted into the second key hole 313. The fourth lock portion is unlocked 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. Further, if the common key 9 is not inserted into the second key hole 313, the opening / closing hook 32 cannot open / close. That is, unless the terminal portion 5 tightens the ground member 99, the opening / closing hook 32 cannot open / close. Therefore, it is possible to prevent an error in the attachment procedure for the electric line 199.

Further, if the opening / closing hook 32 is not open, the common key 9 cannot be removed from the second key hole 313. Further, if the common key 9 is not inserted into the first key hole 54, the terminal portion 5 cannot loosen the tightening of the ground member 99. That is, if the opening / closing hook 32 is not open, the terminal portion 5 cannot loosen the tightening of the ground member 99. Therefore, it is possible to prevent an error in the removal procedure for the electric line 199.

Further, the common key 9 has a shaft portion 91 in which the first key groove 92a and the second key groove 92b are formed on the outer peripheral surface. The first keyway 92a extends axially from one end 91a of the shaft portion 91 toward the other end 91b. The second key groove 92b is connected to the first key groove 92a and extends in the circumferential direction of the shaft portion 91. According to this, the first key groove 92a can be made to face a predetermined position on the inner wall of the first key hole 54 or the second key hole 313 (for example, the first protrusion 50a or the second protrusion 31a). 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 50a protruding from the inner wall of the first key hole 54 toward the central portion in the radial direction of the first key hole 54. 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 portion 50a moves relatively from one of the first key groove 92a and the second key groove 92b to the other. According to this, when the first protrusion 50a is located inside the first keyway 92a, the shaft 91 can move in the axial direction. Further, when the first protrusion 50a is located inside the second keyway 92b, the shaft 91 cannot move in the axial direction.

Further, the fourth lock portion has a second protrusion 31a protruding from the inner wall of the second key hole 313 toward the central portion in the radial direction of the second key hole 313. When the shaft portion 91 is inserted into the second key hole 313, the second protrusion 31a 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 second protrusion portion 31a moves relatively from one of the first key groove 92a and the second key groove 92b to the other. According to this, when the second protrusion 31a is located inside the first keyway 92a, the shaft 91 can move in the axial direction. Further, when the second protrusion 31a is located inside the second keyway 92b, the shaft 91 cannot move in the axial direction.

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

Further, a second groove portion 411b 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 the rotation of the second screw portion 41 around the axis by being arranged inside the second groove portion 411b. The third lock pin 43 moves from the inside to the outside of the second groove portion 411b when the common key 9 is inserted into the second key hole 313. According to this, the rotation lock on the second screw portion 41 can be released by inserting the common key 9 into the second key hole 313.

Further, at least a part of the common key 9 is made of a magnet. According to this, the common key 9 can be magnetically attached to the first housing 50 or the second housing 31.

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.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, in the above embodiment, the shape of the ring of the base portions 431 and 631 is shown as a rectangle, but the shape is not limited to the rectangle and may be circular or the like. Further, although the compression coil springs are shown as elastic members 44, 64, 66, 385, respectively, the present invention is not limited to the compression coil springs, and rubber may be used. Further, in the head 93, not only the magnet portion 95 but also the grip portion 94 for the operator to grip may be a magnet. That is, the entire head 93 may be a magnet.

1 Insulation rod 3 Hook part 5 Terminal part 7 Ground wire 9 Common key 11 Insulation rod body 31 Second housing 31a Second protrusion 32 Opening and closing hook 33 First rotation shaft 34 First arm 35 Second rotation shaft 36 Second arm 37 Third rotating shaft 38 Third arm 40 Opening / closing mechanism 41 Second screw portion 42 Elevating portion 43 Third lock pin 44 Elastic member 48 Hook piece 49a First receiving portion 49b Second receiving portion 50 First housing 50a First protrusion Part 51 1st part 52 2nd part 53 3rd part 54 1st key hole 55 3rd space part 61 1st screw part 62 Press plate 63 1st lock pin 64 Elastic member 65 2nd lock pin 66 Elastic member 71 Hook piece 71a Opening and 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 Gripping part 95 Magnet part 97 Hook receiving part 97a Through hole 99 Ground member 100 Short-circuit grounding device 199 Electric line 311 Through hole 312 Thread hole 312a Thread groove 313 Second key hole 314 First space part 315 Second space part 317 Opening 318 Position regulation part 341 Slit 351 Shaft part 352 Rotating plate 361 Slit 381 1 part 382 Lock piece 383 2nd part 384 Guide part 385 Elastic member 386 Connecting part 386a 1st rod-shaped member 386b 2nd rod-shaped member 411 Body part 411a Thread 411b 2nd groove part 411c Axis center 431 Base part 433 1st tip part 435 2nd tip 437 Holding 511 Through hole 513 Screw hole 513a Thread groove 515 1st space 521 Opening 523 2nd space 611 Body 611a Thread 611b 1st groove 611c Axis center 613 Head 631 Base 633 1 Tip part 635 Second tip part 637 Holding part 651 Head 653 Pin body BW Separation direction FW Proximity direction

Claims (10)

Insulation rod and
A hook portion attached to one end of the insulating rod and
The terminal part attached to the ground member and
A ground wire that electrically connects the hook portion and the terminal portion,
A common key that can be inserted into the hook portion and the terminal portion is provided.
When the common key is inserted into the terminal portion, the terminal portion can be fixed to the ground member.
When the terminal portion is fixed to the ground member, the common key can be pulled out from the terminal portion.
The hook portion can be opened and closed when the common key is inserted into the hook portion.
A short-circuit grounding device in which the common key can be pulled out from the hook portion when the hook portion is open. Insulation rod and
A hook portion attached to one end of the insulating rod and
The terminal part attached to the ground member and
A ground wire that electrically connects the hook portion and the terminal portion,
A common key that is inserted into the hook portion and the terminal portion, respectively, is provided.
The terminal part
The first key hole into which the common key is inserted and
It has a first screw portion for tightening the ground member, and has
The first screw portion can rotate 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 tightens the ground member.
The hook portion is
The second key hole into which the common key is inserted and
2nd screw part and
It has an opening / closing hook that opens / closes when the second screw portion rotates.
The second screw portion can rotate when the common key is inserted into the second key hole.
The common key is a short-circuit grounding device that can be pulled out from the second key hole when the opening / closing hook is open. The terminal part
A first lock portion that locks the first screw portion so as not to rotate,
It has a second lock portion that locks the common key so that it does not come out of the first key hole.
The hook portion is
A third lock portion that locks the second screw portion so as not to rotate,
It has a fourth lock portion that locks the common key so that it does not come out of the second key hole.
The first lock portion unlocks 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 is unlocked when the opening / closing hook is opened. The common key is
It has a shaft portion on which a first key groove and a second key groove are formed on the outer peripheral surface.
The first keyway extends axially from one end to the other end of the shaft portion.
The short-circuit grounding device according to claim 3, wherein the second key groove is connected to the first key groove and extends in the circumferential direction of the shaft portion. The second lock portion is
It has a first protrusion, which protrudes from the inner wall of the first key hole toward the center in the radial direction of the first key hole.
When the shaft portion is inserted into the first key hole, the first protrusion portion is located inside the first key groove or inside the second key groove.
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 by rotating the shaft portion around the shaft. The fourth lock portion is
It has a second protrusion protruding from the inner wall of the second key hole toward the center in the radial direction 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 fourth or fifth aspect of the present invention, wherein the second protrusion moves relatively from one of the first key groove and the second key groove to the other by rotating the shaft portion around the shaft. Short-circuit grounding device. On the outer peripheral surface of the first screw portion, a first groove portion extending in the axial direction of the first screw portion is formed.
The first lock portion has a first lock pin that locks the rotation of the first screw portion around an axis by being arranged inside the first groove portion.
The short circuit according to any one of claims 3 to 5, wherein the first lock pin moves from the inside to the outside of the first groove when the common key is inserted into the first key hole. Grounding device. The outer peripheral surface of the shaft portion is connected to a third key groove having a length shorter in the circumferential direction than the second key groove and the third key groove in the axial direction of the shaft portion, and the shaft. A fourth keyway, which is provided at one end of the portion and has a length in the circumferential direction longer than the third keyway, is formed.
The second lock portion has a second lock pin that locks the rotation of the shaft portion around the axis by being arranged inside the third key groove.
Said second locking pin, when the first threaded portion tightens the grounding member, moves to the third key groove or al the fourth keyway, short grounding device of claim 4 or claim 5. 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 portion has a third lock pin that locks the rotation of the second screw portion around the axis by being arranged inside the second groove portion.
The short-circuit grounding device according to claim 3 or 6, 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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