WO2018020538A1

WO2018020538A1 - Earth hook

Info

Publication number: WO2018020538A1
Application number: PCT/JP2016/071689
Authority: WO
Inventors: 橋本　秀雄; 拓生屋敷; 俊夫片岡
Original assignee: 中国電力株式会社
Priority date: 2016-07-25
Filing date: 2016-07-25
Publication date: 2018-02-01
Also published as: JP6164442B1; JPWO2018020538A1

Abstract

[Problem] To provide an earth hook used to release, to the ground, induced current produced in electrical equipment such as power transmission lines, wherein the grounding of electrical equipment is reliably maintained and the risk of induced electric shocks is avoided. [Solution] This earth hook 1 is provided with: an electrically insulated operation rod 2; a head portion metal fixture 3 provided on one end portion of the operation rod 2 and attached to a conductive body, a plurality of grounding metal fixtures 4, 5 attached to a grounding member; and an earth wire 6 electrically connecting the head portion metal fixture 3 and the plurality of grounding metal fixtures 4, 5. For example, the earth wire 6 includes: a main earth wire 6a electrically connected to the head portion metal fixture 3; and a sub earth wire 6b electrically connected to the main earth wire 6a, wherein a main grounding metal fixture 4 is connected to the tip portion of the main earth wire 6a, and a sub grounding metal fixture 5 is connected to the tip portion of the sub earth wire 6b. In addition, the main grounding metal fixture 4 may be connected to the tip portion of one main earth wire 6a, and the sub grounding metal fixture 5 may be connected in the middle of the main earth wire 6a.

Description

Earth hook

The present invention relates to a ground hook used to release an induced current induced in an electrical facility such as a power transmission line to the ground side, and in particular, a head hardware, a ground wire electrically connected to the head hardware, The present invention relates to a grounding hook having a grounding hardware electrically connected to a grounding wire.

During work on electrical equipment such as a power transmission line, the electrical equipment is grounded using a ground hook in order to ensure safety of work.
As the ground hook 1 used for such grounding, the one shown in FIG. 19 is known. This is because the operating rod 2 made of an insulating material such as an epoxy resin that can be gripped by the operator, the head hardware 3 provided at one end of the operating rod 2, and one end of the head hardware 3 electrically And a grounding metal 4 electrically connected to the other end of the grounding wire 6 (see Patent Document 1, etc.).

The head hardware 3 is to be engaged with a current-carrying body such as a power transmission line or an attachment fitting attached to the device, and a main body 31 attached to the distal end portion of the operation rod 2 and rotatable to the main body 31. An opening / closing hook 32 is provided.
In order to firmly fix the grounding wire 6 to a predetermined grounding member such as a steel structure member, the grounding hardware 4 has a U-shaped clamp body 41 made of a conductive material such as a metal, and a screw on the clamp body 41. A pressing member 42 having a threaded portion that can be advanced and retracted, a grounding member is disposed inside the clamp body 41, and the pressing member 42 is turned and tightened to tighten the grounding member between the pressing member and the clamp body 41. In many cases, a clamp type that clamps and fixes is used.

When grounding a power transmission line using such a ground hook 1, for example, (1) First, the grounding hardware 4 is arranged at an appropriate position of the grounding member, and the pressing member 42 is turned to rotate the pressing member 42, the clamp body 41, and the like. The grounding member is clamped and fixed between. Then, (2) the ground hook 6 is wound around the grounding member to prevent the ground hook 1 from falling off, and then (3) the body 31 of the head hardware 3 is held with the operation rod 2. A power transmission line is inserted between the open / close hook 32 and the head hardware 3 is hooked on the power transmission line.

Conventionally, when the clamp type described above is used as the grounding hardware, when grounding a plurality of transmission lines, the grounding hardware is fastened to the grounding member for each transmission line and the head hardware is sent. Since it is necessary to work with the mounting brackets attached to the wires and equipment, and the grounding work becomes very complicated, both ends of the ground wire are used as locking members with almost the same structure. An earth hook that can be easily performed has also been proposed (see Patent Document 2).

JP 2011-142754 A JP 2014-166090 A

However, when it is necessary to change the position of the grounding hardware during painting work or current size survey of the grounding member, (a) the head hardware is removed from the transmission line, and (b) the grounding hardware is temporarily removed from the grounding member. (C) After that, it is necessary to reattach the head hardware to the power transmission line after that, but when doing such work, the procedure is mistaken and the grounding hardware is removed first. And there was a risk of induction electric shock.

Moreover, there is a possibility that the grounding hardware may come loose from the grounding member due to wind or the like, and when working on the electrical equipment without noticing it, there is a disadvantage that a safe work cannot be secured.
In particular, a latch-type grounding metal that is not a clamp type cannot obtain a firm attachment state to the grounding member, and thus there is a risk that the grounding member may fall off, and it is difficult to ensure reliable grounding.

The present invention has been made in view of such circumstances, and has as its main object to provide a ground hook that can reliably maintain grounding of electrical equipment and can avoid the possibility of induction electric shock.

In order to achieve the above object, an earth hook according to the present invention is attached to an operating rod having electrical insulation, a head hardware provided on one end of the operating rod, and holding a conductor, and a grounding member. It has a plurality of grounding hardware, and a ground wire that electrically connects the head metal fitting and the plurality of grounding hardware.

Therefore, according to such a configuration, if a plurality of grounding hardware are attached to the grounding member, even if one of the grounding hardware is mistakenly removed before the head hardware, the grounding state is caused by another grounding hardware. Is secured, so it is possible to prevent accidents. In addition, even if the fixed state of a part of the grounding hardware is loosened or detached, the grounding state is secured by other grounding hardware, so if you touch the loosened or detached grounding hardware by mistake. However, it is possible to eliminate the risk of induction electric shock.

Various forms are possible as the form of providing a plurality of grounding hardware. For example, the grounding wire is electrically connected to the main grounding wire electrically connected to the head hardware and the main grounding wire. A plurality of grounding hardware, the main grounding hardware connected to the tip of the main grounding wire, and the subgrounding hardware connected to the tip of the subgrounding wire. You may make it comprise from these.
The main ground line and the sub ground line may be connected in series, may be connected in parallel, or may be branched from the middle of the main ground line.

Further, the ground wire is constituted by a single main ground wire connected to the plurality of ground metal hardware, and the plurality of ground metal hardware is electrically connected to the tip of the main ground wire. And a sub-grounding hardware provided in the middle of the main earth wire.

Here, the main grounding hardware may be a clip type, but in order to ensure a strong mounting state, the main grounding hardware includes a pair of arm portions provided opposite to each other, and these arm portions. And a metal clamp main body having a connecting portion for connecting to the main ground wire, and a pressing member having a screw portion that is screwed back and forth so as to pass through one arm portion of the clamp main body. The grounding member may be sandwiched between a pressing portion provided at the tip of the screw portion and the other arm portion of the clamp body.

The sub-grounding hardware also includes a pair of arm portions provided opposite to each other, a metal clamp main body having a connecting portion that connects the arm portions and connects to the sub-ground wire, and one of the clamp main bodies. A pressing member provided with a screw portion that advances and retracts so as to pass through the arm portion of the screw portion, and the grounding between the pressing portion provided at the distal end portion of the screw portion and the other arm portion of the clamp body The member may be clamped.

In order to prevent the above-mentioned sub-grounding hardware from getting in the way, an extendable curing bag that accommodates the sub-grounding hardware along the main ground wire is provided. When the sub-grounding hardware is not used, the sub-grounding is attached to the curing bag. You may make it accommodate a hardware.

Further, the sub-grounding hardware provided in the middle of the ground wire includes a metal clamp base having a mounting surface for electrically connecting and holding the main ground wire and mounting the ground member, and the clamp. You may make it comprise from the presser foot which can press the said grounding member with respect to the mounting surface mentioned above of a base, and the urging mechanism which displaces the said presser foot with respect to the pressing direction of the said grounding member.

Here, the urging mechanism includes a receiving object provided on the clamp base so as to be rotatable about a support shaft substantially parallel to the mounting surface, and the mounting surface via the receiving object. And a pressing member provided with a screw portion that displaces the presser foot in the direction of pressing the grounding member so that the presser foot can be moved back and forth substantially vertically, and the pressing member is turned into a clamp base by rotating the receiving member. It may be accommodated. The urging mechanism includes an external member that is slidable with respect to the clamp base and a movable member that is slidable in a direction in which the distance between the mounting surface and the clamp base is changed. The movable member is displaced so that the distance from the mounting surface becomes narrower as the sliding amount from the clamp base of the external member increases, and the presser foot is placed on the portion facing the mounting surface. It may be attached.

As described above, according to the ground hook according to the present invention, since the plurality of grounding hardware attached to the grounding member are connected to the common head hardware via the grounding wire, reliable grounding to the electrical equipment is achieved. It is possible to avoid inductive electric shock accidents even if some grounding hardware is accidentally removed before the head hardware or some grounding hardware is removed from the grounding member. It becomes possible.

FIG. 1 is a diagram showing a configuration example of a ground hook according to the present invention. FIG. 2A is a side view showing the sub-ground metal fitting of the ground hook shown in FIG. 1, and FIG. 2B is the opposite side of the sub-ground metal piece shown in FIG. FIG. 2C is a view of the auxiliary grounding hardware of FIG. 2A viewed from the side where the pressing member is provided. FIG. 2D is a side view showing the main grounding hardware of the ground hook shown in FIG. 1, and FIG. 2E is the opposite side of the main grounding hardware of FIG. 2D to the side where the pressing member is provided. FIG. 2F is a view of the main ground metal fitting of FIG. 2D viewed from the side where the pressing member is provided. FIG. 3 is a view showing a state in which the sub-grounding hardware of the ground hook of FIG. 1 is housed in a curing bag along the main ground line. FIG. 4 is a diagram showing a state in which the main grounding hardware and the sub-grounding hardware are attached to the grounding member in order to ground the power transmission line using the ground hook shown in FIG. FIG. 5 is a diagram illustrating a modification of the configuration example of FIG. 1 (an example in which the connection position of the sub-ground wire is changed). FIG. 6 is a view showing a state in which the auxiliary grounding hardware of the ground hook of FIG. 5 is accommodated in the curing bag along the main grounding wire. FIG. 7 is a diagram showing another configuration example of the ground hook according to the present invention. FIG. 8 is a diagram illustrating a configuration example of a sub-grounding hardware provided in the middle of the ground wire of the ground hook illustrated in FIG. 7 and is a diagram illustrating a state before use. FIG. 8A is a plan view showing a state in which the pressing member of the sub-grounding hardware is housed in the clamp base, and FIG. 8B is a side view of FIG. 8A viewed along the axis of the ground wire. 8 (c) is a front view of FIG. 8 (a) viewed from a direction perpendicular to the axis of the ground wire, and FIG. 8 (d) is a perspective view. FIG. 9 is a view showing a clamp base of the sub-grounding hardware and members attached to the auxiliary grounding hardware shown in FIG. 8, FIG. 9 (a) is a plan view of the clamp base, and FIG. 9 (b) is a clamp base. FIG. 9C is a front view of the clamp base, and FIG. 9D is a view showing the mounting hardware for attaching the ground wire to the clamp base. 10 is a view showing the presser foot of the sub grounding hardware shown in FIG. 8, FIG. 10 (a) is its plan view, FIG. 10 (b) is its side view, and FIG. 10 (c) is its view. It is a front view. 11 is a view showing the pressing member of the sub grounding hardware shown in FIG. 8, FIG. 11 (a) is a plan view thereof, FIG. 11 (b) is a side view thereof, and FIG. It is a front view. FIG. 12 is a view showing a received object of the sub grounding hardware shown in FIG. 8, FIG. 12 (a) is a plan view thereof, FIG. 12 (b) is a side view thereof, and FIG. It is a front view. FIG. 13 is a view showing a state in which the sub-grounding hardware shown in FIG. 8 is attached to a grounding member (iron structural member). FIG. 13 (a) is a plan view thereof, and FIG. FIG. 13 (c) is a front view of FIG. 13 (a) viewed from a direction perpendicular to the axis of the ground wire, and FIG. 13 (d). FIG. FIG. 14 shows another configuration example of the sub-grounding hardware provided in the middle of the ground wire. FIG. 14 (a) is a plan view thereof, FIG. 14 (b) is a side view thereof, and FIG. ) Is a front view thereof, and FIG. 14D is a front view showing a state in which a grounding member is sandwiched. 15 is a view showing an external member of the sub-grounding hardware shown in FIG. 14. FIG. 15 (a) is a plan view thereof, FIG. 15 (b) is a side view thereof, and FIG. It is a front view. FIG. 16 is a diagram showing a clamp base of the sub grounding hardware shown in FIG. 14, FIG. 16 (a) is a plan view thereof, FIG. 16 (b) is a side view thereof, and FIG. It is the front view. FIG. 17 is a view showing the movable member of the sub-grounding hardware shown in FIG. 14. FIG. 17 (a) is a plan view thereof, FIG. 17 (b) is a side view thereof, and FIG. It is a front view. 18 is a diagram showing a procedure for fixing the sub-grounding hardware shown in FIG. 14 to the grounding member. FIG. 18A is a perspective view showing a state before the sub-grounding hardware is fixed to the grounding member. FIG. 18B is a perspective view showing a state in which the auxiliary grounding hardware is fixed to the grounding member. FIG. 19 is a diagram showing a conventional ground hook.

Hereinafter, embodiments of the ground hook according to the present invention will be described with reference to the accompanying drawings.

In FIG. 1, the ground hook 1 includes an operating rod 2, a head hardware 3 fixed to the tip of the operating rod 2, a plurality of

grounding hardware

4 and 5 attached to the grounding member, and a head hardware 3. It has a ground wire 6 for connecting a plurality of

grounding hardware

4 and 5.

The operation rod 2 is made of an electrically insulating material such as an epoxy resin, and is formed to have a diameter that can be gripped by an operator (for example, a diameter of 30 to 40 cm), and a total length of about 0.5 m to 6.0 m. It is comprised by the pipe-shaped member.

The head hardware 3 is to be locked to a fitting attached to an electric wire or equipment, and a main body 31 attached to the tip of the operation rod 2 and an opening / closing provided rotatably on the main body 31. And a hook 32.

The main body 31 may be detachable with respect to the operation rod 2, but in this example, it is a fixed type to which the operation rod 2 is always attached. The main body 31 includes a metal cover 33 that houses an opening / closing mechanism (not shown) that opens and closes the opening / closing hook 32 by rotating the operating rod 2 about its axis.

The opening / closing hook 32 is attached so as to be rotatable about a rotation shaft 34 provided at the distal end portion of the main body 31, and rotates around the rotation shaft 34 with the rotation of the operation rod 2. The cover 33 approaches or separates from the cover 33. That is, the opening / closing hook 32 rotates in the closing direction when the operation rod 2 is rotated in one direction (for example, clockwise) around the axis, and the operation rod 2 is rotated in the other direction (for example, counterclockwise). It rotates in the opening direction by being rotated clockwise. In an opened state, a current-carrying body of an electrical facility, which is an object to be grounded, is arranged between the opening / closing hook 32 and the metal cover 33, and the opening / closing hook 32 is closed in this state to place the opening / closing hook 32 and the metal cover 33. The current-carrying body is sandwiched to make it electrically conductive.
An attachment fitting 35 for attaching the ground wire 6 is provided on the back surface of the metal cover 33 opposite to the opening / closing hook 32.

On the other hand, the plurality of

grounding hardwares

4 and 5 are composed of two grounding hardwares of the main grounding hardware 4 and the sub-grounding hardware 5 in this example, and each has the same structure as shown in FIG. is doing.
Each of the

grounding hardwares

4 and 5 is a clamp type, and

U-shaped clamp bodies

41 and 51 made of a conductive metal, and screw portions 42 a and so on that can be screwed back and forth on the

clamp bodies

41 and 51. It has the

pressing members

42 and 52 which have 52a.

The

clamp bodies

41 and 51 connect a pair of

arm portions

41a, 41b, 51a, and 51b provided opposite to each other and one end portions of the

respective arm portions

41a, 41b, 51a, and 51b and connect to the ground wire 6. Mounting

brackets

43 and 53 are constituted by connecting

portions

41c and 51c provided on the back surface. The

pressing members

42 and 52 include

screw portions

42a and 52a that are screwed back and forth so as to pass through one

arm portion

41a and 51a of the clamp

main bodies

41 and 51, and outside the clamp

main bodies

41 and 51 of the

screw portions

42a and 52a. Handle

portions

42b and 52b provided at the end portions located at the end portions, and

pressing portions

42c and 52c provided at the end portions located inside the clamp

main bodies

41 and 51 of the

screw portions

42a and 52a. An iron structure member serving as a grounding member is disposed between the

parts

42c and 52c and the

other arm parts

41b and 51b of the clamp

main bodies

41 and 51, and the

handle parts

42b and 52b are rotated to push the iron structure member 42c. 52c and the

arm portions

41b and 51b.

The ground wire 6 is composed of a main ground wire 6 a that connects the head hardware 3 and the main grounding hardware 4, and a sub-ground wire 6 b that connects the main grounding metal 4 and the sub-grounding hardware 5. One end of the main ground wire 6a is attached to the mounting bracket 35 of the head hardware 3 and is electrically connected to the metal cover 33, and the other end of the main ground wire 6a is connected to one end of the sub ground wire 6b. The main grounding metal 4 is attached to a mounting bracket 43 provided on the back surface of the clamp body 41 and is electrically connected to the main grounding metal 4 and the sub ground wire 6b. Further, the other end of the sub-ground wire 6 b is attached to a mounting bracket 53 provided on the back surface of the clamp body 51 of the sub-grounding metal 5 and is electrically connected to the sub-grounding metal 5.

In the above-described configuration example, the curing bag 7 covering a part of the main ground wire 6a and the sub ground wire 6b is provided, and when the ground hook 1 is not used, as shown in FIG. In addition, the sub-grounding hardware 5 is disposed along the main ground wire 6 a, and the sub-grounding hardware 5 is accommodated in the curing bag 7 together with the grounding wire 6 in this state. The curing bag 7 has a cylindrical shape whose upper and lower ends that can be expanded and contracted along the main ground wire 6a are opened, and the lower end is fixed in the vicinity of the main grounding hardware 4 by fastening means such as an insulation lock 7a. Further, the auxiliary grounding hardware 5 is covered and held with respect to the main ground wire 6a by narrowing the appropriate portion of the intermediate portion with the

magic bands

7b and 7c.

In the above configuration, in order to perform the grounding work using the above-described ground hook 1, the main grounding hardware 4 is attached to the steel structural member 100 serving as the grounding member as shown in FIG. The steel structural member 100 is disposed inside the main body 41, and the handle portion 42b of the pressing member 42 is turned to sandwich the steel structural member 100 between the pressing portion 42c and the arm portion 41b).

Thereafter, the upper and lower

magic bands

7b, 7c of the curing bag 7 are removed, and the curing bag 7 is pushed down along the main ground wire 6a to expose the contained sub-grounding hardware 5. Then, after the secondary ground wire 6b is wound around the steel structural member 100 serving as the grounding member, the secondary grounding hardware 5 is similarly attached to the steel structural member 100 (the steel structural member is placed inside the clamp body 51 of the secondary grounding metal 5). 100 is arranged, and the handle part 52b of the pressing member 52 is rotated to sandwich the steel structural member 100 between the pressing part 52c and the arm part 51b).

After the mounting of the

grounding hardware

4 and 5 to the grounding member as described above, the operating tool 2 is lifted to approach the head hardware 3 to the current carrying body of the electrical equipment to be grounded (in this example, the transmission line 200), and the operating bar. 2 is rotated about the axis, the opening / closing hook 32 is rotated in the opening direction, the power transmission line 200 is disposed between the opening / closing hook 32 and the metal cover 33, and then the operation rod 2 is rotated backward about the axis. When the power transmission line 200 is sandwiched between the opening / closing hook 32 and the metal cover 33 and the head hardware 3 is hooked on the power transmission line 200, the grounding operation is completed.

Therefore, when it is necessary to change the position of the grounding hardware during painting work or actual size survey of the steel structural member 100, the main grounding hardware 4 is accidentally removed before the head hardware 3 is removed from the transmission line 200. Even when the main grounding hardware 4 is loosened by the wind or the like and falls off the iron structural member 100, the grounding of the power transmission line 200 is secured by the sub-grounding hardware 5, so that it is possible to avoid the possibility of induction electric shock. It becomes possible.

Further, when the ground hook 1 is not used, the sub-grounding hardware 5 is accommodated and held in the curing bag 7 along the main grounding wire 6a. The hook 1 can be easily carried, and when only the main grounding hardware 4 is used, there is no possibility that the sub-grounding hardware 5 accidentally touches the operator.

In addition, in the structure mentioned above, the aspect which connected the sub earth wire 6b to the attachment metal fitting 43 of the main earth metal fitting 4 which the main earth wire 6a connects, and connected the main earth metal fitting 4 and the sub earth metal fitting 5 in series was shown. However, even if the sub-ground wire 6b is connected to the head hardware 3 together with the main ground wire 6a and the sub-ground metal 5 is connected in parallel to the main ground metal 4, as shown in FIG. 6b may be electrically connected in the middle of the main ground wire 6a using the connection fitting 8, and the sub ground wire 6b may be branched from the middle of the main ground wire 6a to provide the sub grounding hardware 5.

In the configuration in which the sub-ground wire 6b is branched from the middle of the head hardware 3 and the main ground wire 6a as shown in FIG. 6 (in FIG. 6, the sub-ground wire 6b is halfway from the main ground wire 6a. The sub-grounding hardware 5 may be disposed along the main ground wire 6a from above and stored in the curing bag 7 together with the ground wire 6 in this state. In such a configuration, the upper end portion of the curing bag 7 is fixed in the vicinity of the connection fitting by fastening means such as an insulok 7a, and the sub-grounding hardware 5 is squeezed between the lower end portion and the middle portion by the

magic bands

7b and 7c. May be covered while being held against the main ground wire 6a.

Further, the number of sub-grounding hardware 5 is not limited to one, and a plurality of sub-grounding hardware 5 may be provided. As shown by the one-dot chain line in FIG. A plurality of sub-grounding hardware 5 may be connected in parallel to each other, or a sub-grounding wire 6b of another sub-grounding hardware may be connected to the sub-grounding hardware 5 to connect a plurality of sub-grounding hardware 5 in series. . Further, as shown by a one-dot chain line in FIG. 5, a plurality of sub-grounding hardware 5 may be provided by branching a plurality of sub-ground lines from the middle of the main ground line.

The above configuration is an example in which a plurality of

ground metal fittings

4 and 5 are provided at the tip ends of the

ground wires

6a and 6b (the main ground metal fixture 4 is provided at the tip portion of the main ground wire 6a and the sub-ground metal fixture 5 is attached. As shown in FIG. 7, the main grounding hardware 4 and the subgrounding hardware 5 are connected to one grounding wire 6 (main grounding wire 6a), as shown in FIG. You may make it provide. That is, the main ground metal 4 is electrically connected to the tip of the main ground wire 6a, and the sub-ground metal 5 is electrically connected to the middle of the main ground wire 6a.

In such a configuration, the main grounding hardware 4 can use the same grounding hardware as in the above-described configuration example. Since it is provided in the middle of the wire 6, it is preferable to have a structure different from that of the main grounding hardware 4.

As such a sub-grounding metal fitting 5, a clamp base that is electrically connected to the ground wire 6 and holds the ground wire, a presser fitting that is displaced so as to press the grounding member against the clamp base, It is preferable to have driving means for moving the presser foot forward and backward with respect to the pressing direction of the grounding member. For example, the rotary pressing type grounding metal shown in FIGS. 8 to 13 and the slide pressing type grounding metal shown in FIGS. 14 to 18 may be adopted.

First, the sub-grounding hardware 5 shown in FIGS. 8 to 13 will be described. The clamp base 61 is made of a conductive metal, and as shown in FIG. The

clamp pieces

61a and 61b that make a pair to face each other and a connecting portion 61c that connects one side edges of the

clamp pieces

61a and 61b are configured by a U-shaped clamp body, and the outer surface of one clamp piece 61a (this example) Then, the ground wire 6 is held by the mounting bracket 63 and electrically connected to the lower surface of the clamp piece 61a. The inner surface of the clamp piece 61a (the upper surface in the figure of the clamp piece 61a) is a mounting surface 61d on which an iron structural member that serves as a grounding member is placed.

In the other clamp piece 61b, a slit 65 that accommodates a pressing member 63 (to be described later) and rotatably mounts the metal receiving member 64 extends from the center of the side edge opposite to the connecting portion 61c toward the connecting portion 61c. . Further, a flange portion of a presser foot 62 (shown in FIG. 10), which will be described later, is disposed in a grounding member insertion space 66 formed between the

clamp pieces

61a and 61b at the boundary between the other clamp piece 61b and the connecting portion 61c. Engaging grooves 67 for slidably inserting 62b are formed on both sides of the connecting portion 61c.

A pressing member 63 is attached to the slit 65 via a metal receiving piece 64. As shown in FIG. 11, the pressing member 63 includes a handle portion 63 a that can be gripped and a screw portion 63 b that protrudes perpendicularly from the handle portion 63 a, The screw part 63 b is disposed in the slit 65.

As shown in FIG. 12, the metal receiving member 64 is reciprocal from a cylindrical receiving portion 64a that is screwed with the screw portion 63b of the pressing member 63 to advance and retract the screw portion 63b, and a peripheral surface of the cylindrical receiving portion 64a. And a pair of support shafts 64b projecting outward. The support shaft 64b is rotatably inserted into a support hole 68 formed substantially parallel to the mounting surface 61d described above on the inner surfaces facing each other in the vicinity of the end portion of the slit 65.
Accordingly, the metal receiver 64 is rotatably attached to the clamp piece 61b around a support shaft 64b substantially parallel to the placement surface 61d, and the pressing member 63 stands vertically from a position parallel to the clamp piece 61b. It can be turned to the position to be installed.

The protruding amount of the clamp piece 61b from the connecting portion 61c is formed shorter than the protruding amount of the clamp piece 61a from the connecting portion 61c, and the screwing amount of the screw portion 63b of the pressing member 63 to the metal receiving member 64 is reduced. When the pressing member 63 is in a tilted state (as a screwing amount so that the screw portion 63b does not protrude from the metal receiving member 64), the screw portion 63b of the pressing member 63 is accommodated in the slit 65, and the handle portion 63a. Is accommodated in the clamp body 61 so as to be flush with the clamp piece 61b.

In this example, when the pressing member 63 is tilted so that the clamp piece 61 b and the handle portion 63 a are flush with each other, the size of the pressing member 63 and the clamp piece 61 b that connects the pressing member 63 via the metal receiving piece 64 is combined. Is set to be approximately the same as the size of the clamp piece 61a, and when the handle member 63a is rotated around the axis by raising the pressing member 63, the screw portion 63b protrudes from the metal receiving member 64. The tip of the lever is displaced to the vicinity of the placement surface 61d.

The presser foot 62 is made of a metal plate, and as shown in FIG. 10, the flat plate portion 62a formed so as not to protrude from the clamp piece 61a and both sides of one side edge of the flat plate portion 62a A flange portion 62b that is bent and slidably inserted into the engagement groove 67 is formed. The protruding amount of the flange portion 62b from the flat plate portion 62a is such a length that the flat plate portion 62a does not come out of the engagement groove 67 even if the flat plate portion 62a is displaced from the inner surface of one clamp piece 61b to the inner surface of the other clamp piece 61a. Is formed.

Then, the presser foot 62 is inserted to the end of the grounding member insertion space 66 and the flange portion 62b is inserted into the engagement groove 67, and the spring 69 (for example, left and right 2) is interposed between the clamp piece 61a. Is always urged toward the clamp piece 61b. Further, when the pressing member 63 is raised to rotate the handle portion 63a around the axis of the screw portion 63b and the screw portion 63b protrudes from the metal receiving member 64, the tip of the screw portion 63b is pushed by the spring 69 of the presser foot 62. The presser foot 62 is pressed against the surface opposite to the disposed side, and the presser foot 62 is displaced toward the placement surface 61 d against the spring force of the spring 69.

Therefore, after inserting the steel structural member 100 into the grounding member insertion space 56 of the clamp body 61 of the sub grounding hardware 5 to which the ground wire 6 is attached, as shown in FIG. 13, the pressing member 63 is raised to raise the handle portion 63a. Is rotated around the axis of the screw portion 63b, the presser foot 62 is pushed down against the spring force of the spring 69 by the screw portion 63b of the pressing member 63, and the steel structure member 100 is pressed against the presser foot 62 and the clamp piece 61a. Therefore, it is possible to fix the sub-grounding hardware 5 to the steel structural member 100.

In the above configuration, in order to perform the grounding work using the above-described ground hook 1, the main grounding hardware 4 is attached to the steel structural member 100 serving as the grounding member (the clamp body of the main grounding hardware 4) as in the above configuration example. 41) The steel structural member 100 is disposed inside 41 and the handle portion 42b of the pressing member 42 is turned to sandwich the steel structural member 100 between the pressing portion 42c and the arm portion 41b).

Thereafter, the sub-grounding hardware 5 provided in the middle of the ground wire 6 (main ground wire 6 a) is approached to the steel structural member 100, and the steel structural member 100 is connected to the grounding member insertion space 66 (grounding member insertion space 66 of the clamp body 61. Between the presser foot 62 and the clamp piece 61a. Then, when the pressing member 63 provided on the clamp piece 61b is raised to rotate the handle portion 63a and the screw portion 63b is pushed out to the ground member insertion space 66, the presser foot 62 is moved by the screw portion 63b to the spring of the spring 69. The steel structural member 100 moves against the force, and is clamped between the presser foot 62 and the clamp piece 61a.

Therefore, even in this example, since the main grounding hardware 4 and the sub-grounding hardware 5 are grounded, the main grounding hardware 4 is mistakenly removed before the head hardware 3 is removed from the transmission line 200. Even when the main grounding hardware 4 is loosened by wind or the like and falls off the steel structural member 100, the grounding state of the electrical equipment can be secured by the sub-grounding hardware 5, and the possibility of induction electric shock can be avoided. It becomes.

Further, in this example, unlike the main grounding hardware 4, the steel structural member 100 is sandwiched between the clamp piece 61 a of the clamp main body 61 by the wide presser foot 62, so that the sub grounding hardware 5 with respect to the steel structural member 100 is held. It becomes possible to maintain a stable fixed state.
In this example as well, a plurality of sub-grounding hardware 5 may be provided in the middle of the main ground wire 6a.

Next, the sub-grounding hardware 5 shown in FIGS. 14 to 18 will be described. The sub-grounding hardware 5 is the same as the sub-grounding hardware 5 shown in FIGS. 8 to 13 in that it is provided in the middle of the ground wire 6. However, it is different from the above configuration example in that the attachment to the steel structural member 100 can be performed with a single touch by sliding the main body.

As shown in FIG. 14, the sub-grounding hardware 5 includes an outer member 71 having a U-shaped cross section, a clamp base 72 slidably assembled inside the outer member 71, and a clamp inside the outer member 71. A movable member 73 that is slidably assembled with the base 72 and is slidably assembled with the clamp base 72 in a direction (vertical direction in the figure) perpendicular to the slide direction of the clamp base 72. Configured.

As shown in FIG. 15, the external member 71 has a U-shaped cross section having a pair of opposing

clamp walls

71a and 71b and a connecting wall 71c for connecting one side edges of the

clamp walls

71a and 71b. The opposite side of the connection wall 71c is opened between the pair of

clamp walls

71a and 71b, and both ends in the longitudinal direction (extending direction of the side edges to which the

clamp walls

71a and 71b of the connection wall 71c are connected) The part is opened, and an accommodation space 74 for accommodating a clamp base 72 and a movable member 73 described later is formed. One clamp wall 71a and connecting wall 71c are formed in a flat plate shape having a substantially uniform predetermined thickness. On the other hand, the other clamp wall 71b is formed in a wedge shape in which the wall thickness gradually increases from one to the other in the longitudinal direction of the external member 71 (the extending direction of the side edge to which the clamp wall of the connecting wall 71c is connected). In addition, the inner surface of the other clamp wall 71b is formed as a tapered surface that is inclined with respect to the inner surface of one of the clamp walls 71a facing the other. Therefore, the accommodation space 74 formed between the pair of

clamp walls

71a and 71b of the external member 71 has a distance between the inner surface of one clamp wall 71a and the inner surface of the other clamp wall 71b in the longitudinal direction of the external member 71. It is formed so as to gradually decrease from one to the other.

A first guide groove 71d for guiding the movement of a clamp base 72, which will be described later, is formed on the inner surface of one clamp wall 71a in the longitudinal direction of the external member 71, and on the inner surface of the other clamp wall 71b. The second guide groove 71e for guiding the movement of the clamp base 72 and the third guide groove 71f for guiding the movement of the movable member 73 are formed in the longitudinal direction of the external member 71, respectively.

The clamp base 72 is slidably assembled along the

clamp walls

71a and 71b and the connecting wall 71c inside the external member 71. As shown in FIG. 16, one clamp wall 71a of the external member 71 is also provided. Are formed so as to have an L-shaped cross section having a bottom wall 72a that is slidably disposed on the side wall and a standing wall 72b that is erected from one side edge of the bottom wall 72a. The length of the bottom wall 72a in the longitudinal direction is substantially equal to the length of the external member 71 in the longitudinal direction, and the width perpendicular to the longitudinal direction (the width in the direction perpendicular to the standing wall 72b) is one of the clamps. The width in the same direction of the wall 71a (the width in the direction perpendicular to the connecting wall 71c) is shorter. The standing wall 72b is erected along the side edge of the bottom wall 72a close to the connecting wall 71c, and the tip portion is slidably inserted into the second guide groove 71e formed in the other clamping wall 71b. Has been.

On the surface of the bottom wall 72a that contacts the clamp wall 71a, a first protrusion 72c that slides in the first guide groove 71d is formed along the longitudinal direction. In this example, the first guide groove 71d is formed in the vicinity of the side edge (the side edge on the open side of the external member 71) away from the coupling wall 71c of the clamp wall 71a. The bottom wall 72a is formed in the vicinity of the side edge away from the standing wall 72b.

Accordingly, the clamp base 72 has the first protrusion 72c guided in the first guide groove 71d and the standing wall 72b guided in the second guide groove 71e, while the longitudinal direction of the external member 71 is increased. The ground wire 6 is inserted behind the standing wall 72b (between the standing wall 72b and the connecting wall 71c) and the ground wire 6 is clamped to the clamp base. A evacuation space 76 for accommodating a connection fitting 75 for electrical connection to the standing wall 72b of the table 72 is formed.

The top surface of the bottom wall 72a (the surface opposite to the side of the bottom wall 72a that contacts the clamp wall 71a) is a mounting surface 72d on which the steel structural member 100 can be mounted. The magnet 77 for adsorbing the steel structural member 100 and temporarily holding the sub grounding hardware 5 to the steel structural member 100 is provided on the surface thereof (in this example, at both ends in the longitudinal direction of the clamp base 72). Is fixed to be flush with the mounting surface 72d.

As shown in FIG. 17, the movable member 73 includes a fitting recess 73 b that fits with a fitting protrusion 72 f provided on the standing wall 72 b of the clamp base 72, and has a tapered upper surface. By forming a surface (by tilting the upper surface), a movable block 73a formed in a wedge shape whose thickness gradually changes along the longitudinal direction, and a bottom wall 72a of the clamp base 72 of the movable block 73a ( The presser foot 73d is fixed to the surface facing the mounting surface 72d) via a spring 73c.

The movable block 73a is formed to gradually increase in thickness from the thicker side to the thinner side of the clamp wall 71b of the external member 71, and the external member 71 moves in the longitudinal direction so that the movable block 73a extends in the longitudinal direction of the clamp wall 71b. Even if it is relatively displaced, the presser foot 73 d is always parallel to the bottom wall 72 a of the clamp base 72.

The movable block 73a has a second protrusion 73e that slides in the third guide groove 71f along the longitudinal direction on the surface facing the clamp wall 71b, and the bottom of the clamp base 72. A spring 78 is mounted between the wall 72a and the taper surface of the movable block 73a is always brought into contact with the taper surface of the clamp wall 71b. In this example, the third guide groove 71f is formed in the vicinity of the side edge of the clamp wall 71b away from the connecting wall 71c (the side edge on the open side of the external member 71). Accordingly, it is formed in the vicinity of the side edge away from the fitting recess 73b. The spring 78 is interposed between the bottom wall 72a and the side of the movable block 73a that does not interfere with the presser foot 73d.

Further, a guide groove 72g extending in a direction perpendicular to the bottom wall 72a (mounting surface 72d) is formed on the fitting convex portion 72f provided on the standing wall 72b of the clamp base 72. In contrast, the fitting recess 73b of the movable member 73 is formed with a ridge 73g that is slidably fitted into the guide groove 72g.

Accordingly, when the external member 71 is shifted in the longitudinal direction relative to the clamp base 72 from the state in which the clamp base 72 and the movable member 73 are combined and accommodated in the external member 71, the clamp base 72 The stand 72 and the movable member 73 are integrally exposed from the external member 71. However, since the clamp wall 71b and the movable block 73a are formed in a wedge shape, as the amount of exposure of the clamp base 72 increases. The movable member 73 comes close to the bottom wall 72a (mounting surface 72d) of the clamp base 72.

Also, a plurality (two in this example) of locking pins 80 are provided on the taper surface of the movable block 73a (the surface facing the clamp wall 71b) with an interval in the longitudinal direction. The locking pin 80 is accommodated in a pin accommodating recess 81 provided on the tapered surface of the movable block 73a, and a spring or the like (not shown) is rotated in the direction of projecting from the pin accommodating recess 81 around one end. The pin accommodating recess 81 is covered with the external member 71 (clamp wall 71b) unless the latch pin 80 is accommodated in the pin accommodating recess 81 against the urging force of the urging member. I can't do it. That is, when the external member 71 is slid with respect to the clamp base 72 and the movable member 73 and the pin accommodating recess 81 is released from the external member 71 and is exposed, the locking pin 80 is pinned by the biasing force of the biasing member. The external member 71 cannot be returned to its original position.

Therefore, the pin housing recess is previously provided so that the steel structural member 100 inserted between the mounting surface 72d of the bottom wall 72a of the clamp base 72 and the presser foot 73d of the movable member 73 can be clamped with a desired clamping force. By adjusting the position 81, it is possible to obtain an appropriate clamping state of the steel structural member 100.

Therefore, in order to perform grounding work using such a ground hook 1, the main grounding hardware 4 is attached to the steel structural member 100 serving as a grounding member as in the above-described configuration example (the clamp body 41 of the main grounding hardware 4. The steel structure member 100 is disposed inside, and the handle part 42b of the pressing member 42 is turned to sandwich the steel structure member 100 between the pressing part 42c and the arm part 41b).

Thereafter, the sub grounding hardware 5 provided in the middle of the ground wire is approached to the steel structural member 100, and the steel structural member 100 is moved to the bottom wall 72a of the clamp base 72 and the movable member as shown in FIG. 73 is inserted between the presser foot 73d and placed on the inner surface (mounting surface 72d) of the bottom wall 72a of the clamp base 72. Thus, the sub grounding hardware 5 can be temporarily fixed to the iron structural member 100 by the magnet 77 provided on the mounting surface 72d.

In this state, when the external member 71 is slid in the longitudinal direction (axial direction of the power transmission line) with respect to the clamp base 72, the clamp base 72 is attracted to the iron structure member 100 via the magnet 77. Therefore, as shown in FIG. 18B, the movable member 73 does not move together with the external member 71, and the movable member 73 is moved by the movable block 73 a against the clamp wall 71 b of the external member 71. Since the steel structural member 100 is relatively displaced along the guide groove 72g so as to be close to the bottom wall 72a (mounting surface 72d), the steel structural member 100 is positioned between the presser foot 73d and the bottom wall 72a (mounting surface 72d). It is pinched. At that time, the external member is further slid in order to increase the clamping force, and when the pin accommodating recess 81 is detached from the external member 71, the locking pin 80 protrudes from the pin accommodating recess 81. It becomes impossible to return, and the state which clamped the steel structural member 100 with strong clamping force is maintained.

Accordingly, in this example as well, since the main grounding hardware 4 and the sub-grounding hardware 5 are grounded, the main grounding hardware 4 is mistakenly attached before the head hardware 3 is removed from the electrical equipment such as the transmission line. Even when the main grounding hardware 4 is loosened by wind or the like and falls off the steel structural member 100, the grounding state of the electrical equipment can be secured by the sub-grounding hardware 5, and the risk of induction electric shock is avoided. It becomes possible.

Also in this example, unlike the main grounding hardware 4, the steel structural member 100 is sandwiched between the wide presser foot 73 d and the bottom wall 72 a of the clamp base 72, so that the secondary grounding hardware 5 is stably attached. Can be maintained.
In this example as well, a plurality of sub-grounding hardware 5 may be provided in the middle of the main ground wire 6a.
Further, in the above-described example, the locking pin is rotated by the urging force of the urging member so as to protrude from the pin accommodating recess 81, but the locking pin is urged by the urging force of the urging member. You may make it protrude from the vertical direction.

DESCRIPTION OF SYMBOLS 1 Ground hook 2 Operation rod 3 Head metal 4 Main ground metal 5 Sub ground metal 6 Ground wire 6a Main ground wire 6b Sub ground wire 7

Curing bag

41, 51

Clamp body

41a, 41b, 51a,

51b Arm part

41c,

51c connection Part

42, 52 Pressing

member

42a,

52a Screw part

42c,

52c Pressing part

61, 72

Clamp base

62, 73d Presser foot 63 Pressing member 64 Receptacle 71 External member 73 Movable member 100 Iron structural member (grounding member)

Claims

An operating rod having electrical insulation;
A head hardware provided at one end of the operation rod and detachably attached to the current-carrying member,
A plurality of grounding hardware removably attached to the grounding member;
An earth wire for electrically connecting the head metal fitting and the plurality of grounding hardware;
An earth hook characterized by comprising:
The ground wire has a main ground wire electrically connected to the head hardware and a sub-ground wire electrically connected to the main ground wire,
2. The plurality of grounding hardwares include a main grounding hardware connected to a front end portion of the main grounding wire and a subgrounding hardware connected to a front end portion of the sub-grounding wire. Earth hook.
The ground wire is composed of a single main ground wire connected to a plurality of the ground metal hardware, and the plurality of ground metal hardware is electrically connected to a front end portion of the main ground wire; 2. The ground hook according to claim 1, comprising a sub-grounding hardware connected in the middle of the main ground wire.
The main grounding hardware includes a pair of arm portions provided opposite to each other, a metal clamp body that connects the arm portions and is connected to the main ground wire, and one of the clamp bodies. A pressing member provided with a screw portion that advances and retreats so as to penetrate the arm portion, and the grounding member between the pressing portion provided at the tip portion of the screw portion and the other arm portion of the clamp body The ground hook according to claim 2 or 3, wherein the ground hook is clamped.
The sub-grounding hardware includes a pair of arm portions provided opposite to each other, a metal clamp body that connects the arm portions and connects to the sub-ground wire, and one of the clamp bodies. A pressing member provided with a screw portion that advances and retreats so as to penetrate the arm portion, and the grounding member between the pressing portion provided at the tip portion of the screw portion and the other arm portion of the clamp body The ground hook according to claim 2, wherein the ground hook is clamped.
6. An earth hook according to claim 2, further comprising an extendable / retractable curing bag that accommodates the auxiliary grounding hardware along the main earth wire.
The sub-grounding hardware includes a metal clamp base having a mounting surface for electrically connecting and holding the main ground wire and mounting the grounding member, and the mounting surface of the clamp base. 4. A grounding hook according to claim 3, wherein the grounding member comprises a presser foot that allows the grounding member to be pressed against the grounding member, and an urging mechanism that displaces the presser foot with respect to the pressing direction of the grounding member. .
The urging mechanism includes a metal receiving member provided on the clamp base so as to be rotatable about a support shaft substantially parallel to the mounting surface, and the mounting surface through the metal receiving member. And a pressing member provided with a screw part that displaces the presser foot in the pressing direction of the grounding member so that the presser foot can be moved back and forth substantially vertically, and the pressing member rotates the receiving member to the clamp base. The ground hook according to claim 7, wherein the ground hook can be accommodated.
The urging mechanism includes an external member that is slidable with respect to the clamp base, and a movable member that is slidable in a direction in which a distance from the mounting surface is changed with respect to the clamp base. The movable member is displaced so that the distance from the mounting surface becomes narrower as the sliding amount of the external member from the clamp base increases, and the movable member is moved to the portion facing the mounting surface. 8. The ground hook according to claim 7, wherein a presser foot is attached.