JP2006340456A - Short-circuiting/earthing device - Google Patents

Short-circuiting/earthing device Download PDF

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JP2006340456A
JP2006340456A JP2005160304A JP2005160304A JP2006340456A JP 2006340456 A JP2006340456 A JP 2006340456A JP 2005160304 A JP2005160304 A JP 2005160304A JP 2005160304 A JP2005160304 A JP 2005160304A JP 2006340456 A JP2006340456 A JP 2006340456A
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short
movable arm
conductor
electric circuit
side connector
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Terukazu Aida
輝和 会田
Takeshi Shimoda
剛 下田
Shoichi Honda
晶一 本田
Shinichiro Sunazaki
進一郎 砂▲崎▼
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Tokyo Electric Power Company Holdings Inc
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Tokyo Electric Power Co Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To facilitate installation work of a short-circuiting/earthing device by providing its electric path side connector which can be applied commonly to conductors having various profiles and can be secured surely and firmly by a removable operation insulating rod. <P>SOLUTION: A fixed arm 11 is formed integrally with a head member 1 which can be secured under variable state of angle, and a movable arm 2 is fixed rotatably to the head member 1. A contact member 20 is provided rotatably at the distal end of the movable arm 2 and the movable arm 2 is pushed up by means of an operating rod 4 so that the fixed arm 11 and the contact member 20 grip the conductor of an electric path. The contact member 20 turns depending on the various profiles of the conductor and an electric path side connector is secured firmly to the conductor. A rotating shaft 5 is arranged at the end of the electric path side connector and rotated by a removable operation insulating rod so that the movable arm 2 turns and the electric path side connector grips and secures the conductor. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、電路を無充電として電気工事あるいは電力設備の点検等を実施する際に、作業者の安全等を目的として無充電の電路を短絡接地するための短絡接地器具に関する。   The present invention relates to a short-circuit grounding device for short-circuiting an uncharged electric circuit for the purpose of safety of workers and the like when performing electrical work or inspection of electric power equipment with the electric circuit being uncharged.

変電所から電力を工場等の需要先に配電する電路に、別の需要先へ配電するための新たな電路を敷設し接続する電気工事は、変電所側の開閉器及び需要先の開閉器を開路し電路を無充電とした条件で行われる。このような電気工事では、工事作業者の安全は最優先に配慮すべき事項であり、電路に誤充電が生じないよう十分な注意が払われる。そして、万が一、誤通電や誘導電流の発生により電路に充電が起きたとしても、工事作業者が感電したり、設備が破損することのないように、電路の両端に短絡接地器具を取り付けて工事中電路を接地する。短絡接地器具の取り付けは、労働安全関係の法規で定められており、電路を無充電として実施する電気工事や電力設備の点検において行われるものである。   The electrical work to install and connect a new electric circuit to distribute to another customer on the electric circuit that distributes the electric power from the substation to the customer in the factory, etc. It is performed under the condition that the circuit is opened and the electric circuit is not charged. In such electrical work, the safety of construction workers is a matter of highest priority, and sufficient care is taken to prevent erroneous charging of the electric circuit. In the unlikely event that charging occurs in the circuit due to incorrect energization or induction current, construction work should be carried out by installing short-circuit grounding devices at both ends of the circuit so that the construction worker will not get an electric shock or damage the equipment. Ground the medium circuit. The installation of short-circuit grounding equipment is stipulated by the laws and regulations related to occupational safety, and is performed in electrical work and inspection of electric power equipment in which the electric circuit is not charged.

短絡接地器具は、無充電とした電路の電線等の導体に取り付け固定する電路側接続具と、地中に埋め込んだ接地極に接続する接地側接続具と、両者の間を接続する短絡用ケーブルとから構成される。電路側接続具及び接地側接続具は、工事中の振動などによって外れることを防止するよう、対象の電線等に強固に固定しなければならない。
ところで、電路側接続具を取り付ける対象となる導体には、電線等の断面円形のものあるいはキューピクル内に収容された平板状の導体等、さまざまな形態のものがある。また、工場等の需要先の受電設備にも多様な設備があり、電路側接続具を固定する個所の位置や周囲状況は、個々の受電設備に応じて異なるものとなっている。
The short-circuit grounding equipment is an electric circuit side connector that is attached and fixed to a conductor such as an uncharged electric circuit wire, a ground side connector that is connected to a grounding electrode embedded in the ground, and a short-circuit cable that connects between the two. It consists of. The electric circuit side connector and the ground side connector must be firmly fixed to the target electric wire or the like so as to be prevented from coming off due to vibration during construction.
By the way, there are various types of conductors to which the electric circuit side connection tool is attached, such as a conductor having a circular cross section such as an electric wire or a flat conductor housed in a cupicle. In addition, there are various types of power receiving facilities at demand destinations such as factories, and the positions and surrounding conditions of places where electric circuit side connectors are fixed differ depending on the individual power receiving facilities.

電路側接続具の導体への取り付けは、開路した開閉器の近傍で行う作業となる。電路側接続具の取り付け時は、電路を無充電とした状態で作業を行うが、万一、充電されている状況の場合の感電被災を防止するため、取り付け作業は、操作絶縁棒と呼ばれる操作用具を使用し作業者との間に一定の距離を保った状態で行われる。このように、電気工事の開始時における短絡接地器具の取り付けは、慎重さを要する複雑かつ困難な作業であり、確実な取り付けを容易に行うため、電路側接続具として種々の構造の接続具が開発されている。   The attachment of the electric circuit side connector to the conductor is performed in the vicinity of the opened switch. When attaching the electric circuit side connector, work with the electric circuit in a non-charged state, but in the unlikely event that it is charged, the installation work is an operation called an operation insulation rod. It is performed in a state where a fixed distance is maintained between the operator and the tool. As described above, the installation of the short-circuit grounding device at the start of the electric work is a complicated and difficult operation requiring carefulness. Has been developed.

特開2002−152935号公報には、キューピクル内の板状の導体に取り付けるために適した電路側接続具が開示されている。この電路側接続具は、図6に示されるとおり、板状の導体101を幅方向に挟み込む一対の挟持部102を備えており、挟持部には導体の側部が接触する凹部103が形成されるとともに、一方の挟持部には地中の接地極に接続される短絡用ケーブル104が固着される。両方の挟時部102はリンク機構105によってねじ部106に連結され、ねじ部106の進退に応じて一対の挟持部102の先端は開閉する。電路側接続具を導体に取り付けるときは、図示しない操作絶縁棒を挿入案内部107に挿入してねじ部106を回転させる。ねじ部106が延びるとリンク機構105で連結された一対の挟持部102が閉じるようになり、その凹部103の間に導体101が挟まれ、電路側接続具は導体101に固定される。   Japanese Patent Application Laid-Open No. 2002-152935 discloses an electric circuit side connector suitable for being attached to a plate-like conductor in a cupicle. As shown in FIG. 6, the electric circuit side connector includes a pair of sandwiching portions 102 that sandwich the plate-like conductor 101 in the width direction, and the sandwiching portion is formed with a recess 103 that contacts the side portions of the conductor. At the same time, a short-circuit cable 104 connected to the grounding electrode in the ground is fixed to one of the sandwiching portions. Both sandwiching portions 102 are connected to the screw portion 106 by the link mechanism 105, and the tips of the pair of sandwiching portions 102 open and close as the screw portion 106 advances and retreats. When attaching the electric circuit side connector to the conductor, an operation insulating rod (not shown) is inserted into the insertion guide portion 107 and the screw portion 106 is rotated. When the screw portion 106 extends, the pair of sandwiching portions 102 connected by the link mechanism 105 closes, the conductor 101 is sandwiched between the recesses 103, and the electric circuit side connector is fixed to the conductor 101.

また、特開平7−123552号公報には、電線等断面円形の導体に取り付ける電路側接続具が開示されている。図7に示されるように、この電路側接続具は、円形の電線201を受け具202と押さえ部材との間に挟み込むものであって、受け具202には電線201が係合する凹部が形成されている。押さえ部材は、上方回転軸203を中心に回動する上側押さえ部材204と下方回転軸205を中心に回動する下側押さえ部材206とが、ともに受け具202に設けられており、上側押さえ部材204の先端部は二股となっている。操作棒207を回してねじ部208を回転させることにより、上側押さえ部材204は反時計方向に回動し、電線201を凹部に収容するように受け具202に押し付ける。これと同時に、下側押さえ部材206は時計方向に回動して上側押さえ部材204の二股の先端に入り込み、挟み込んだ電線201が抜け落ちるのを防止する。
特開2002−152935号公報 特開平7−123552号公報
Japanese Patent Application Laid-Open No. 7-123552 discloses an electric circuit side connector attached to a conductor having a circular cross section such as an electric wire. As shown in FIG. 7, this electric circuit side connector is sandwiched between the circular electric wire 201 between the receiving device 202 and the pressing member, and the receiving device 202 is formed with a recess for engaging the electric wire 201. Has been. The holding member includes an upper pressing member 204 that rotates about the upper rotating shaft 203 and a lower pressing member 206 that rotates about the lower rotating shaft 205, both of which are provided on the receiver 202. The front end of 204 is bifurcated. By rotating the operating rod 207 and rotating the screw portion 208, the upper pressing member 204 rotates counterclockwise and presses the electric wire 201 against the receiving member 202 so as to be accommodated in the recess. At the same time, the lower pressing member 206 rotates clockwise to enter the forked end of the upper pressing member 204 and prevent the pinched electric wire 201 from falling off.
JP 2002-152935 A JP-A-7-123552

短絡接地器具を取り付ける電路の導体には、前述したとおり、板状のものや円形のもの等、種々の形状の導体があり、電路の公称電圧等に応じその寸法もまちまちである。さらに、需要先の受電設備の状況あるいは周囲環境にも多種多様なものがあり、障害物の存在により電路側接続具の取り付け方向が制約される場合もある。このため、短絡接地器具の電路側接続具としては、特許文献1に記載の板状の導体に適するもの又は特許文献2に記載の断面円形の導体に適するもの等、多数の接続具を準備しておく必要があるとともに、電気工事に際しては、使用可能な電路側接続具について予め変電所及び受電設備の調査確認作業を要するのが現実であった。   As described above, the conductor of the electric circuit to which the short-circuit grounding device is attached includes conductors of various shapes such as a plate-like one and a circular one, and the dimensions thereof vary depending on the nominal voltage of the electric circuit. Furthermore, there are various types of power receiving equipment at the customer's site or the surrounding environment, and the installation direction of the electric circuit side connector may be restricted due to the presence of an obstacle. For this reason, as the electric circuit side connection tool of the short-circuit grounding device, a large number of connection tools such as one suitable for the plate-like conductor described in Patent Document 1 or one suitable for the circular conductor described in Patent Document 2 are prepared. In addition, it was necessary to check and check the substations and power receiving facilities in advance for usable electrical circuit side connectors when performing electrical work.

また、電路側接続具の取り付けは、短絡接地器具を取り付ける電路が万一充電されている場合などの不測の感電事故を防止するため、操作絶縁棒を用い一定の距離を隔てて行われる。電路側接続具の取り付けが終了した後は、工事の障害にならぬよう長尺の操作絶縁棒を取り外すことが望ましく、操作絶縁棒は着脱可能であるものが一般的である。したがって、電路側接続具を強固に取り付けるには、取り付け作業時に操作絶縁棒と電路側接続具とを確実に接続し固定しなければならない。そして、取り付けは遠隔操作による作業となることから、取り付ける対象である導体を随時目視できる状態で作業を実施することも必要である。
本発明は、短絡接地器具の電路側接続具に関して、種々の形状を有する導体に共通して適用することができ、しかも、着脱式の操作絶縁棒により確実かつ強固に固定することが可能な電路側接続具を提供し、多数の接続具を用意し保守管理を行う等の必要性を回避して、安全な電気工事のために不可欠な、短絡接地器具の設置作業の容易化を図ることを課題とする。
In addition, the electric circuit side connector is attached at a constant distance using an operation insulating rod in order to prevent an unexpected electric shock accident such as when the electric circuit to which the short-circuit grounding device is attached is charged. After installation of the electric circuit side connection tool is completed, it is desirable to remove the long operation insulating rod so as not to obstruct the construction, and the operation insulating rod is generally detachable. Therefore, in order to attach the electric circuit side connector firmly, it is necessary to securely connect and fix the operation insulating rod and the electric circuit side connector during the installation operation. And since attachment is a work by remote operation, it is also necessary to carry out the work in a state where the conductor to be attached can be visually observed at any time.
INDUSTRIAL APPLICABILITY The present invention can be applied in common to conductors having various shapes with respect to the electric circuit side connector of the short-circuit grounding apparatus, and can be securely and firmly fixed by a detachable operation insulating rod. Provide side connectors, avoid the need to prepare and maintain a large number of connectors, and facilitate the installation of short-circuit grounding equipment, which is essential for safe electrical work. Let it be an issue.

上記の課題に鑑み、本発明は、短絡接地器具の電路側接続具において、固定アームと可動アームとを設けて電線等の導体を挟み込み、可動アームの先端には、可動アームに対して回動可能な接触部材を取り付け、導体を固定アームと接触部材とに接触させて把持することにより、板状の導体や円形の導体を把持することを可能としたものである。すなわち、本発明は、
「短絡用ケーブルが接続され、電路に取り付けてその電路の短絡接地を行う短絡接地器具の電路側接続具であって、
前記電路側接続具は、直線状の接触面を有する固定アームを一体に形成した頭部部材と、前記頭部部材に回動可能に設けられた可動アームとを備え、
前記可動アームの先端には、直線状の接触面を有する接触部材を前記可動アームに対して回動可能に設け、
前記頭部部材に連結された操作機構により前記可動アームを回動させ、電路の導体を前記固定アームと前記接触部材との間に挟み込んで把持する」
ことを特徴とする短絡接地器具の電路側接続具となっている。
In view of the above-described problems, the present invention provides a connection arm for a short-circuit grounding device, in which a fixed arm and a movable arm are provided to sandwich a conductor such as an electric wire, and the tip of the movable arm is rotated with respect to the movable arm. By attaching a possible contact member and holding the conductor in contact with the fixed arm and the contact member, a plate-like conductor or a circular conductor can be held. That is, the present invention
"A short-circuit grounding fixture that is connected to a short-circuit cable and attached to the electrical circuit to perform short-circuit grounding of the electrical circuit.
The electric circuit side connector includes a head member integrally formed with a fixed arm having a linear contact surface, and a movable arm provided rotatably on the head member,
A contact member having a linear contact surface is provided at the tip of the movable arm so as to be rotatable with respect to the movable arm.
The movable arm is rotated by the operation mechanism connected to the head member, and the conductor of the electric circuit is sandwiched between the fixed arm and the contact member and gripped.
It becomes the electric circuit side connection tool of the short circuit grounding fixture characterized by the above-mentioned.

請求項2に記載のように、前記可動アームにはカム面を形成するとともに、前記操作機構には、前記カム面に接触する操作ロッドを配置し、前記操作ロッドで前記カム面を押圧することにより前記可動アームを回動させることができる。   According to a second aspect of the present invention, a cam surface is formed on the movable arm, and an operation rod that contacts the cam surface is disposed in the operation mechanism, and the cam surface is pressed by the operation rod. Thus, the movable arm can be rotated.

この場合において、請求項3に記載のように、前記頭部部材は、前記操作ロッドの軸線周りの角度位置が可変であるとともに、前記軸線と直交する軸線周りにも角度位置が可変であるよう固定可能に構成されていることが好ましい。   In this case, as described in claim 3, the angular position of the head member around the axis of the operating rod is variable, and the angular position of the head member is also variable around the axis orthogonal to the axis. It is preferable to be configured to be fixable.

電路側接続具の取り付け及び取り外しのため、請求項4に記載のように、前記操作機構の端部には、操作絶縁棒の先端部が係合する回転軸を配置し、操作絶縁棒により前記回転軸を回転させて前記操作ロッドを移動させることができる。   In order to attach and remove the electric circuit side connection tool, as described in claim 4, a rotating shaft that engages a tip end portion of the operation insulating rod is disposed at an end portion of the operation mechanism, and the operation insulating rod performs the operation. The operating rod can be moved by rotating the rotating shaft.

請求項5に記載のように、前記操作機構の前記操作ロッドと前記回転軸との間に曲がり部を設け、前記操作ロッドの軸線と前記回転軸の軸線とは一定の角度で交わるよう構成することが望ましい。   According to a fifth aspect of the present invention, a bent portion is provided between the operating rod of the operating mechanism and the rotating shaft, and the axis of the operating rod and the axis of the rotating shaft intersect at a constant angle. It is desirable.

請求項6に記載のように、前記曲がり部を、曲がり管とその曲がり管内に配置された複数のボールにより構成し、前記回転軸を回転させ、前記ボールを介して前記操作ロッドを移動させるようにすることができる。この場合は、請求項7に記載のように、前記曲がり管内に配置された前記ボールは、前記曲がり管の内径より小さい直径を有するものを配置し、前記曲がり管の内壁と前記ボールとの間に間隙を存在させることが好ましい。   According to a sixth aspect of the present invention, the bent portion includes a bent pipe and a plurality of balls disposed in the bent pipe, the rotating shaft is rotated, and the operation rod is moved via the ball. Can be. In this case, as described in claim 7, the ball disposed in the bent pipe has a diameter smaller than the inner diameter of the bent pipe, and is disposed between the inner wall of the bent pipe and the ball. It is preferable to have a gap in the surface.

本発明の短絡接地器具の電路側接続具は、導体を挟み込んで把持するため、固定アームを一体に形成した頭部部材と、この頭部部材に回動可能に設けられた可動アームとを備えており、可動アームの先端には、接触部材が回動可能に設けられている。固定アーム及び接触部材には、それぞれ直線状の接触面が形成してあり、電線等の断面円形の導体を把持するときは、接触部材は可動アームに沿った状態で可動アームと一体となって操作機構により回動される。これにより、円形の導体は、その上部が固定アームの接触面に、下部が接触部材の接触面に押し付けられ、さらに側部が頭部部材の側面に押し付けられて、電路側接続具に強固に把持される。円形の導体を挟み込むときには、固定アームと接触部材とは先細りの状態となるため、導体が電路側接続具から抜け落ちることはない。   The electric circuit side connection tool of the short-circuit grounding device of the present invention includes a head member integrally formed with a fixed arm and a movable arm rotatably provided on the head member in order to sandwich and hold the conductor. In addition, a contact member is rotatably provided at the tip of the movable arm. Each of the fixed arm and the contact member has a linear contact surface. When gripping a conductor having a circular cross section such as an electric wire, the contact member is integrated with the movable arm in a state along the movable arm. It is rotated by the operation mechanism. As a result, the circular conductor has its upper part pressed against the contact surface of the fixed arm, the lower part is pressed against the contact surface of the contact member, and the side part is pressed against the side surface of the head member. Grasped. When sandwiching the circular conductor, the fixed arm and the contact member are in a tapered state, so that the conductor does not fall out of the electric path side connection tool.

また、比較的薄い板状の導体を把持する場合は、操作機構で可動アームを回動したときには、接触部材は、始めは可動アームに沿った状態で動くが、接触部材の先端が板状の導体に当接すると可動アームに対して回動する。さらに可動アームを回動すると接触部材はその先端部を中心として回動するようになり、遂にはその接触面が全面に亘り板状の導体に当接する状態となる。したがって、板状の導体は固定アームと接触部材の接触面の間に強く締め付けられ、接触面の全体に作用する摩擦力により確実に把持されることとなる。このように、本発明の電路側接続具は、固定する導体の形状や寸法を問わず、これに対して強固に固定することが可能である。   When gripping a relatively thin plate-like conductor, when the movable arm is rotated by the operation mechanism, the contact member initially moves along the movable arm, but the tip of the contact member has a plate-like shape. When it contacts the conductor, it rotates with respect to the movable arm. When the movable arm is further rotated, the contact member is rotated about the tip thereof, and finally the contact surface comes into contact with the plate-like conductor over the entire surface. Therefore, the plate-like conductor is strongly clamped between the fixed arm and the contact surface of the contact member, and is reliably gripped by the frictional force acting on the entire contact surface. As described above, the electric circuit side connection tool of the present invention can be firmly fixed to any shape and size of the conductor to be fixed.

請求項2の発明のように、可動アームにカム面を形成し、操作機構に設けた操作ロッドでカム面を押圧することにより可動アームを回動させると、操作ロッドとカム面との間が直接連結されておらず、導体を把持する頭部部材に対する操作機構の相対的位置が自由に設定できるようになる。さらに、カム面の形状を変更することにより、操作ロッドのストロークに対する可動アームの動きの量を変えることができる。   As in the invention of claim 2, when the cam surface is formed on the movable arm and the movable arm is rotated by pressing the cam surface with the operation rod provided in the operation mechanism, the gap between the operation rod and the cam surface is reduced. It is not directly connected, and the relative position of the operation mechanism with respect to the head member that holds the conductor can be freely set. Furthermore, by changing the shape of the cam surface, the amount of movement of the movable arm with respect to the stroke of the operating rod can be changed.

請求項2の発明では、導体を把持する頭部部材に対する操作機構の相対的位置が自由に設定できるから、請求項3の発明のように、頭部部材を、操作ロッドの軸線周りの角度位置が可変であるとともに、その軸線と直交する軸線周りにも角度位置が可変であるよう固定可能に構成することができる。このため、頭部部材を操作する操作機構の方向を、把持する導体の周囲に存在する障害物を避ける方向あるいは導体の把持状態を目視しながら作業のできる方向に設定することができる。   In the invention of claim 2, since the relative position of the operating mechanism with respect to the head member holding the conductor can be set freely, the head member is positioned at an angular position around the axis of the operating rod as in the invention of claim 3. Can be fixed so that the angular position is variable around an axis orthogonal to the axis. For this reason, the direction of the operating mechanism that operates the head member can be set to a direction that avoids an obstacle existing around the conductor to be gripped or a direction in which the work can be performed while observing the gripping state of the conductor.

電路側接続具の取り付け作業では、もちろん、感電事故を防止する必要がある。請求項4の発明のように、操作機構の端部に回転軸を配置し、操作絶縁棒によりその回転軸を回転させて操作ロッドを移動させるときは、操作絶縁棒を用いて遠隔操作することで導体との距離が確保され、作業の安全性が向上する。   Of course, it is necessary to prevent an electric shock accident when installing the electric circuit side connector. When the rotating shaft is arranged at the end of the operating mechanism and the operating rod is moved by rotating the rotating shaft by the operating insulating rod as in the invention of claim 4, the remote operation is performed using the operating insulating rod. As a result, the distance from the conductor is secured, and the safety of work is improved.

請求項5の発明のように、操作機構の操作ロッドと前記の回転軸との間に曲がり部を設けたときは、操作絶縁棒の脇の個所で導体への取り付けが行われることとなり、操作絶縁棒が視界の障害となることはなく、作業個所を目視しながら取り付け作業を実施できる。   When the bending portion is provided between the operation rod of the operation mechanism and the rotary shaft as in the invention of claim 5, the attachment to the conductor is performed at the side of the operation insulating rod, and the operation is performed. The insulating rod does not obstruct the field of view, and the mounting operation can be performed while viewing the work site.

請求項6の発明のように、前記の曲がり部を、曲がり管とその曲がり管内に配置された複数のボールにより構成し、そのボールを介して操作ロッドを移動させるようにしたときは、曲がり部の角度等にかかわらず、導体を把持するための操作力を操作絶縁棒から操作ロッドに確実に伝達することができる。この場合において、請求項7の発明のように、曲がり管内に配置されたボールの直径を曲がり管の内径より小さくすると、複数のボールは曲がり管の中心軸と外れた点で相互に接触する。そのため、前記の回転軸を回転させボールに力を加えると、ボールの接触部には中心軸の軸方向の力のみならず曲がり管の径方向にも分力が生じ、曲がり管及びボールは多少弾性変形を起こす。この弾性変形とボールの接触部に働く摩擦によって、導体を把持する部分の緩みを防止できる。つまり、導体を把持した可動アームが少量移動したとしても、弾性変形のばね作用と摩擦力により可動アームに作用する力を保持することが可能である。   As in the invention of claim 6, when the bent portion is constituted by a bent tube and a plurality of balls arranged in the bent tube, and the operation rod is moved through the ball, the bent portion Regardless of the angle or the like, the operating force for gripping the conductor can be reliably transmitted from the operating insulating rod to the operating rod. In this case, as in the seventh aspect of the invention, if the diameter of the ball disposed in the bent tube is made smaller than the inner diameter of the bent tube, the plurality of balls come into contact with each other at a point deviating from the central axis of the bent tube. For this reason, when a force is applied to the ball by rotating the rotating shaft, a component force is generated not only in the axial direction of the central axis but also in the radial direction of the bent tube at the contact portion of the ball. Causes elastic deformation. The elastic deformation and the friction acting on the contact portion of the ball can prevent loosening of the portion holding the conductor. That is, even if the movable arm holding the conductor moves a small amount, it is possible to maintain the force acting on the movable arm by the elastic deformation spring action and the frictional force.

以下、図面によって本発明の短絡接地器具について説明する。図1は本発明の短絡接地器具の電路側接続具を全体的に表す図であり、図2には、無充電とした電路の導体を把持する部分である頭部部材付近の詳細図を示す。図3は、導体を把持したときの可動アーム等の作動状態を示す図である。   Hereinafter, the short-circuit grounding apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a diagram generally showing the electric circuit side connection tool of the short-circuit grounding device of the present invention, and FIG. 2 shows a detailed view of the vicinity of the head member, which is a portion that holds the conductor of the electric circuit that is not charged. . FIG. 3 is a diagram illustrating an operating state of the movable arm or the like when the conductor is gripped.

本発明の電路側接続具の先端には、図1〜図3に示されるように、導体を把持する頭部部材1が配置され、この頭部部材1には軸部10から直角方向に伸びる固定アーム11が一体に形成されている。また、頭部部材1には可動アーム2が取り付けられ、可動アーム2は頭部部材1に固定されたアーム支持軸12を中心として回動可能となっている。可動アーム2を回動させるため、全体を符号3で示す操作機構が頭部部材1に連結される。この操作機構3の一端には可動アーム2と接触してこれを回動させる操作ロッド4が配置され、他端には後述する操作絶縁棒9により回転される回転軸5が配置されている。操作機構3の中間部には直角に曲がる曲がり管6が置かれ、この曲がり管6は操作機構3の曲がり部を構成する。   As shown in FIGS. 1 to 3, a head member 1 that grips a conductor is disposed at the tip of the electric circuit side connector of the present invention, and the head member 1 extends in a direction perpendicular to the shaft portion 10. The fixed arm 11 is integrally formed. In addition, a movable arm 2 is attached to the head member 1, and the movable arm 2 is rotatable about an arm support shaft 12 fixed to the head member 1. In order to rotate the movable arm 2, an operation mechanism generally indicated by reference numeral 3 is connected to the head member 1. An operation rod 4 that contacts and rotates the movable arm 2 is disposed at one end of the operation mechanism 3, and a rotating shaft 5 that is rotated by an operation insulating rod 9 described later is disposed at the other end. A bending pipe 6 that bends at a right angle is placed in an intermediate part of the operation mechanism 3, and the bending pipe 6 constitutes a bending part of the operation mechanism 3.

固定アーム11の下面は、把持する導体に接触する直線状の接触面を形成するとともに、頭部部材1の上部には、短絡用ケーブルを固定し抑えるためボルト13が設けてある。頭部部材1の軸部10は、図2の左側の側面図に示されるとおり、二股に分かれ、その中央の空間部に可動アーム2が回動可能に配置される。可動アーム2の根元部は、頭部部材1の膨出した部分に固定されたアーム支持軸12に軸支されており、また、可動アーム2は、頭部部材1との間に設けられたコイルばね7によって、図2の右側の図において反時計方向に回動するよう付勢されている。   The lower surface of the fixed arm 11 forms a linear contact surface that comes into contact with the conductor to be gripped, and a bolt 13 is provided on the upper portion of the head member 1 to fix and suppress the short-circuit cable. As shown in the left side view of FIG. 2, the shaft portion 10 of the head member 1 is divided into two forks, and the movable arm 2 is rotatably disposed in the central space portion. The base portion of the movable arm 2 is supported by an arm support shaft 12 fixed to the bulged portion of the head member 1, and the movable arm 2 is provided between the head member 1 and the arm member 12. The coil spring 7 is biased to rotate counterclockwise in the right side of FIG.

可動アーム2の先端には、接触部材20が回動可能に設置される。接触部材20は、図2の左側の図に示される断面から分かるように、導体に接触する直線状の接触面の両側に側面部が設けられた形状であり、その側面部が可動アーム2の先端部の支持軸21に回動可能にはめ込まれる。支持軸21には線細工ばね22が取り付けてあり、接触部材20はこの線細工ばね22によって時計方向に回動するよう付勢される。   A contact member 20 is rotatably installed at the tip of the movable arm 2. As can be seen from the cross section shown in the drawing on the left side of FIG. 2, the contact member 20 has a shape in which side portions are provided on both sides of a linear contact surface that contacts the conductor. It is fitted to the support shaft 21 at the tip so as to be rotatable. A wirework spring 22 is attached to the support shaft 21, and the contact member 20 is urged by the wirework spring 22 to rotate clockwise.

頭部部材1は、内面に内ねじが形成されたねじ孔14を有する頭部軸15に回動可能に取り付けられ、可動アーム2及び接触部材20が設けられた頭部部材1は、いわば首振り運動が可能となっている(図1の右側の図を参照)。そのため、図2の左側の側面図に示されるように、頭部軸15の上部は二股に分かれており、ここに頭部部材1の二股の軸部10が挿入され、軸部10が軸線16を中心に回動可能なように軸支される。頭部軸15の二股部の一方には締め付けボルト17が置かれ、これにより。頭部部材1を頭部軸15に任意の角度を持たせて固定することができる。   The head member 1 is rotatably attached to a head shaft 15 having a screw hole 14 with an internal thread formed on the inner surface, and the head member 1 provided with the movable arm 2 and the contact member 20 is, so to speak, a neck. Swing motion is possible (see the diagram on the right side of FIG. 1). Therefore, as shown in the left side view of FIG. 2, the upper portion of the head shaft 15 is divided into two forks, into which the bifurcated shaft portion 10 of the head member 1 is inserted. It is pivotally supported so that it can rotate around the center. A tightening bolt 17 is placed on one of the bifurcated portions of the head shaft 15. The head member 1 can be fixed to the head shaft 15 at an arbitrary angle.

頭部軸15のねじ孔14には、中空の継手8の上部のねじ部が嵌合し、継手8には操作ロッド4が挿入されている。操作ロッド4の上端は球面をなしており、操作ロッド4が押し上げられたときに、頭部軸15を貫通して可動アーム2の下面のカム面23に接触する。
操作ロッド4の下端部は、やはり球面をなしており、曲がり管6内に配置されたボール61に接触する。継手8と操作ロッド4との間にはコイルばね81が配置してあり、操作ロッド4には下向きのばね力が加えられている。この継手8は、外側にはめ込まれたナット82により曲がり管6のフランジ上面に、軸線周りには任意の角度で締め付け固定することができる。このため、曲がり管6の上部フランジの外周面には、ナット82の内ねじと嵌合するねじが形成されている。
An upper thread portion of the hollow joint 8 is fitted into the screw hole 14 of the head shaft 15, and the operation rod 4 is inserted into the joint 8. The upper end of the operation rod 4 has a spherical surface. When the operation rod 4 is pushed up, the operation rod 4 passes through the head shaft 15 and contacts the cam surface 23 on the lower surface of the movable arm 2.
The lower end portion of the operation rod 4 is also spherical, and comes into contact with a ball 61 disposed in the bent tube 6. A coil spring 81 is disposed between the joint 8 and the operation rod 4, and a downward spring force is applied to the operation rod 4. The joint 8 can be fastened and fixed at an arbitrary angle around the axis on the upper surface of the flange of the bent pipe 6 by a nut 82 fitted outside. For this reason, on the outer peripheral surface of the upper flange of the bent pipe 6, a screw that fits with the inner screw of the nut 82 is formed.

ここで、操作ロッド4を移動させるための操作機構3における駆動部分の構成について、駆動部分の分解図である図4も参照しながら説明する。
図1に示されるように、操作機構3の中間に置かれた曲がり管6内に配置された複数のボール61は、曲がり管6の内径よりも小さな直径を有し、ボール61と曲がり管6の内壁との間には間隙が形成される。曲がり管6内の、操作ロッド4と反対側のボール61には、駆動軸31の端部の球面が当接してボール61を押圧する。この部分の曲がり管6のフランジ外周には、駆動軸31を収容する円筒形の駆動軸ハウジング32がねじ止めされている。
Here, the configuration of the drive portion in the operation mechanism 3 for moving the operation rod 4 will be described with reference to FIG. 4 which is an exploded view of the drive portion.
As shown in FIG. 1, the plurality of balls 61 arranged in the bending pipe 6 placed in the middle of the operation mechanism 3 have a diameter smaller than the inner diameter of the bending pipe 6. A gap is formed between the inner wall and the inner wall. The spherical surface at the end of the drive shaft 31 is brought into contact with the ball 61 on the opposite side of the operation rod 4 in the bending tube 6 to press the ball 61. A cylindrical drive shaft housing 32 that houses the drive shaft 31 is screwed to the outer periphery of the flange of the bent pipe 6 in this portion.

駆動軸31は、図4から明らかなように、ねじ孔33を設けた大径部を有し、大径部の外周には直線状の溝34が設けられている。溝34にはボール35がはめ込まれ、このボール35は駆動軸ハウジング32の孔にもはまり込んでおり、駆動軸31の回転を防止して軸方向に移動するよう案内する。駆動軸31のねじ孔33の内ねじには回転軸5の外ねじがはまり込み、両方のねじはいわゆる送りねじ機構を構成する。回転軸5の端部には、操作絶縁棒9の断面多角形の頭部91が嵌合する多角形孔51が設けてあり、また、回転軸5の軸方向位置は、駆動軸ハウジング32に固定された蓋体36をベアリング37で挟み込むことにより規定される。   As is clear from FIG. 4, the drive shaft 31 has a large diameter portion provided with a screw hole 33, and a linear groove 34 is provided on the outer periphery of the large diameter portion. A ball 35 is fitted in the groove 34, and the ball 35 is also fitted in the hole of the drive shaft housing 32 to prevent the drive shaft 31 from rotating and guide it to move in the axial direction. The outer screw of the rotary shaft 5 is fitted into the inner screw of the screw hole 33 of the drive shaft 31, and both screws constitute a so-called feed screw mechanism. A polygonal hole 51 into which a head 91 having a polygonal cross section of the operation insulating rod 9 is fitted is provided at the end of the rotary shaft 5, and the axial position of the rotary shaft 5 is provided in the drive shaft housing 32. It is defined by sandwiching the fixed lid 36 with a bearing 37.

図5には、本発明の短絡接地器具の電路側接続具を固定する際に用いる操作絶縁棒9を示す。操作絶縁棒9は、絶縁体である例えばFRPで製造された、内管92及び外管93を備えた二重管構造を有しており、外管93は内管92に対し一定の範囲でスライド可能となっている。内管92の先端には断面多角形の頭部91が設けられ、電路側接続具の回転軸5に形成された多角形孔51にはまり込む。そして、外管93の先端には内ねじ94を形成した継手部95が設けられ、操作時には、駆動軸ハウジング32の外周に形成されたねじ38にはまり込んで、操作絶縁棒9が電路側接続具に固定される。外管93及び内管92の、作業者が手で保持する部分は、絶縁性をさらに増すよう絶縁ゴムでカバーされている。   In FIG. 5, the operation insulation stick | rod 9 used when fixing the electric circuit side connection tool of the short circuit grounding apparatus of this invention is shown. The operation insulating rod 9 has a double tube structure including an inner tube 92 and an outer tube 93 made of an insulator such as FRP, and the outer tube 93 is in a certain range with respect to the inner tube 92. It can slide. A head 91 having a polygonal cross section is provided at the tip of the inner tube 92 and fits into a polygonal hole 51 formed in the rotary shaft 5 of the electric circuit side connector. A joint portion 95 having an inner thread 94 is provided at the distal end of the outer tube 93. During operation, the joint portion 95 is fitted into a screw 38 formed on the outer periphery of the drive shaft housing 32, and the operation insulating rod 9 is connected to the electric circuit side. Fixed to the tool. The portions of the outer tube 93 and the inner tube 92 that are held by the operator's hands are covered with insulating rubber so as to further increase the insulating properties.

次いで、本発明の短絡接地器具を取り付けるための作業手順について説明する。実際の取り付け作業では、無充電の電路に電路側接続具を取り付けるのに先立ち、短絡用ケーブルの先端に固着した接地側接続具を地中に埋め込んだ接地極に接続する。この接続が確実になされていないと感電事故を起こす虞れがあるから、ここでは図示を省略するが、電路側接続具と接地側接続具とは通常時には取り外しができない短い鎖で連結され、相互にロックが行われている。接地側接続具を接地極の導体に固定すると、その導体に押圧されてロックが外れ、離れた場所に存在する導体に電路側接続具を取り付けることができるようになる。   Next, an operation procedure for attaching the short-circuit grounding apparatus of the present invention will be described. In the actual installation work, prior to attaching the electric circuit side connector to the non-charged electric circuit, the ground side connector fixed to the tip of the shorting cable is connected to the ground electrode embedded in the ground. If this connection is not made securely, there is a risk of electric shock, so illustration is omitted here, but the electric circuit side connector and the ground side connector are normally connected by a short chain that cannot be removed, and are mutually connected. There is a lock on. When the ground-side connector is fixed to the conductor of the ground electrode, the conductor is pressed to release the lock, and the electric-circuit-side connector can be attached to a conductor existing at a remote location.

電路側接続具の取り付け作業では、取り付ける対象の導体の形状や周囲の障害物の状況等に応じて、まず、固定アーム11及び可動アーム2等の方向を設定する。本発明の電路側接続具においては、頭部部材1は首振り運動が可能であるとともに軸線周りにも自由な角度で固定可能であるから、取り付けのために好適な向きに頭部部材1を容易に設定することができる。こうして頭部部材の方向を設定した後は、締め付けボルト17及びナット32により頭部部材1を締め付け固定する。   In the installation work of the electric circuit side connection tool, the directions of the fixed arm 11 and the movable arm 2 are first set according to the shape of the conductor to be attached, the situation of surrounding obstacles, and the like. In the electric circuit side connector according to the present invention, the head member 1 can swing, and can also be fixed around the axis at a free angle. It can be set easily. After setting the direction of the head member in this way, the head member 1 is fastened and fixed by the tightening bolt 17 and the nut 32.

そして、操作絶縁棒9の内管92の頭部91を回転軸5の端部に嵌め合わせ、外管93のねじ部を駆動軸ハウジング32にねじ止めして、操作絶縁棒9を電路側接続具に連結する。この状態で、開路された電路の導体に接近して導体を固定アーム10及び接触部材20との間に挿入し、操作絶縁棒9の内管92を回して回転軸5を回転させる。回転軸5を回転させると、送りねじ機構により駆動軸31は軸方向に移動し、曲がり管6内のボール61を介して操作ロッド4を押し上げる。操作ロッド4は可動アーム2を回動させ接触部材20を上方に移動させて、固定アーム10と接触部材20との間に導体を挟み込み、導体は強固に固定される。このとき、図3に示すとおり、導体(2点鎖線で表す)が断面円形のものであれば図3(a)の状態となり、また、板状のものであれば図3(b)の状態となって、種々の形状の導体を確実に把持することができる。
取り付け作業が終わると、操作絶縁棒9の外管93を逆方向に回転し、ねじによる結合を解いて、操作絶縁棒9を電路側接続具から取り外す。
Then, the head 91 of the inner tube 92 of the operation insulating rod 9 is fitted to the end of the rotary shaft 5, and the screw portion of the outer tube 93 is screwed to the drive shaft housing 32 to connect the operation insulating rod 9 to the electric circuit side. Connect to the tool. In this state, the conductor is inserted between the fixed arm 10 and the contact member 20 close to the conductor of the opened circuit, and the rotating shaft 5 is rotated by turning the inner tube 92 of the operation insulating rod 9. When the rotating shaft 5 is rotated, the drive shaft 31 moves in the axial direction by the feed screw mechanism, and pushes up the operating rod 4 via the ball 61 in the bent tube 6. The operating rod 4 rotates the movable arm 2 to move the contact member 20 upward, sandwiching the conductor between the fixed arm 10 and the contact member 20, and the conductor is firmly fixed. At this time, as shown in FIG. 3, if the conductor (represented by a two-dot chain line) has a circular cross section, the state shown in FIG. 3A is obtained. If the conductor is a plate, the state shown in FIG. Thus, various shapes of conductors can be reliably gripped.
When the attaching operation is completed, the outer tube 93 of the operation insulating rod 9 is rotated in the reverse direction, the connection by the screw is released, and the operation insulating rod 9 is removed from the electric circuit side connection tool.

本発明の電路側接続具に曲がり管6が存在するので、操作絶縁棒9が作業者の視界を妨げることはなく、作業者は取り付ける導体を目視しながら作業を実施できる。また、導体を強固に締め付けると、曲がり管6及びボール61は多少弾性変形するのでこの部分にばね作用が生じ、締め付けの緩みを防止することができる。   Since the bent pipe 6 is present in the electric circuit side connector according to the present invention, the operation insulating rod 9 does not interfere with the operator's field of view, and the operator can perform the operation while visually checking the conductor to be attached. Further, when the conductor is firmly tightened, the bent tube 6 and the ball 61 are somewhat elastically deformed, so that a spring action is generated in this portion, and loosening of the tightening can be prevented.

電気工事が終了すると、導体に固定した電路側接続具を取り外す必要がある。この取り外し作業も操作絶縁棒9を使用して行うため、操作絶縁棒9を電路側接続具に再度連結しなければならない。このとき、本発明の電路側接続具を操作する操作絶縁棒9は二重管になっているので、まず、内管92を突出させその頭部91を回転軸5の多角形孔51にはめ込む。この状態で外管93をスライドさせると、外管93は内管92にガイドされて、そのねじ部94が駆動軸ハウジング32のねじ部38の位置に自動的に整合するようになり、容易に両方のねじを結合することができる。   When the electrical work is completed, it is necessary to remove the electric circuit side connector fixed to the conductor. Since this removal operation is also performed using the operation insulating rod 9, the operation insulating rod 9 must be reconnected to the electric circuit side connector. At this time, since the operation insulating rod 9 for operating the electric circuit side connector of the present invention is a double tube, first, the inner tube 92 is protruded and its head 91 is fitted into the polygonal hole 51 of the rotating shaft 5. . When the outer tube 93 is slid in this state, the outer tube 93 is guided by the inner tube 92, and the screw portion 94 automatically aligns with the position of the screw portion 38 of the drive shaft housing 32. Both screws can be combined.

以上詳述したように、本発明の短絡接地器具の電路側接続具は、固定アームと可動アームとを設け、可動アームの先端には回動可能な接触部材を取り付けて、導体を固定アームと接触部材とに接触させて把持するものであり、さらに、これらの取り付け方向を可変として各種の形状の導体を確実に把持し固定することを可能としたものである。したがって、固定アームや可動アーム等の寸法を変えることにより様々の電圧階級の設備に使用することができるのは明らかである。また、上記の実施例では二重管式の操作絶縁棒を用いてこれを操作しているが、場合によっては、別の形態の操作絶縁棒を用いることも可能である。   As described above in detail, the electric circuit side connector of the short-circuit grounding device of the present invention is provided with a fixed arm and a movable arm, and a rotatable contact member is attached to the tip of the movable arm, and the conductor is fixed to the fixed arm. The contact member is held in contact with the contact member, and the attachment direction can be changed to reliably hold and fix the conductors of various shapes. Therefore, it is obvious that it can be used for equipment of various voltage classes by changing the dimensions of the fixed arm and the movable arm. Further, in the above-described embodiment, this is operated using a double-pipe type operation insulating rod, but in some cases, another type of operation insulating rod can be used.

本発明の短絡接地器具における電路側接続具の全体図及び頭部部材の固定角 度を変更した図である。It is the figure which changed the whole figure of the electric circuit side connection tool in the short circuit grounding fixture of the present invention, and the fixed angle of the head member. 本発明の電路側接続具における頭部部材付近の詳細図である。It is detail drawing of the head member vicinity in the electric circuit side connection tool of this invention. 本発明の頭部部材により導体を把持した状態を示す図である。It is a figure which shows the state which hold | gripped the conductor with the head member of this invention. 本発明の電路側接続具における操作機構の分解図である。It is an exploded view of the operation mechanism in the electric circuit side connection tool of this invention. 本発明の電路側接続具の着脱に用いる操作絶縁棒を示す図である。It is a figure which shows the operation insulation rod used for attachment or detachment of the electrical circuit side connection tool of this invention. 従来の短絡接地器具における電路側接続具の一例を示す図である。It is a figure which shows an example of the electrical circuit side connection tool in the conventional short circuit grounding fixture. 従来の短絡接地器具における電路側接続具の別の例を示す図である。It is a figure which shows another example of the electrical circuit side connection tool in the conventional short circuit grounding fixture.

符号の説明Explanation of symbols

1 頭部部材
11 固定アーム
2 可動アーム
20 接触部材
22 線細工ばね
23 カム面
3 操作機構
31 駆動軸
32 駆動軸ハウジング
4 操作ロッド
5 回転軸
6 曲がり管
61 ボール
7 コイルばね
8 継手
82 ナット
9 操作絶縁棒
DESCRIPTION OF SYMBOLS 1 Head member 11 Fixed arm 2 Movable arm 20 Contact member 22 Wire work spring 23 Cam surface 3 Operation mechanism 31 Drive shaft 32 Drive shaft housing 4 Operation rod 5 Rotating shaft 6 Curved pipe 61 Ball 7 Coil spring 8 Joint 82 Nut 9 Operation Insulation rod

Claims (7)

短絡用ケーブルが接続され、電路に取り付けてその電路の短絡接地を行う短絡接地器具の電路側接続具であって、
前記電路側接続具は、直線状の接触面を有する固定アームを一体に形成した頭部部材と、前記頭部部材に回動可能に設けられた可動アームとを備え、
前記可動アームの先端には、直線状の接触面を有する接触部材を前記可動アームに対して回動可能に設け、
前記頭部部材に連結された操作機構により前記可動アームを回動させ、電路の導体を前記固定アームと前記接触部材との間に挟み込んで把持することを特徴とする短絡接地器具の電路側接続具。
A short-circuit grounding fixture is connected to a short circuit cable and short-circuited to the short circuit grounding device attached to the circuit,
The electric circuit side connector includes a head member integrally formed with a fixed arm having a linear contact surface, and a movable arm provided rotatably on the head member,
A contact member having a linear contact surface is provided at the tip of the movable arm so as to be rotatable with respect to the movable arm.
An electric circuit side connection of a short-circuit grounding device characterized in that the movable arm is rotated by an operation mechanism coupled to the head member, and a conductor of the electric circuit is sandwiched and held between the fixed arm and the contact member. Ingredients.
前記可動アームはカム面を有するとともに、前記操作機構は、前記カム面に接触する操作ロッドを備えており、前記操作ロッドで前記カム面を押圧することにより前記可動アームを回動させる請求項1に記載の短絡接地器具の電路側接続具。 2. The movable arm has a cam surface, and the operation mechanism includes an operation rod that contacts the cam surface, and the movable arm is rotated by pressing the cam surface with the operation rod. The electric circuit side connection tool of the short circuit earthing instrument of description. 前記頭部部材は、前記操作ロッドの軸線周りの角度位置が可変であるとともに、前記軸線と直交する軸線周りにも角度位置が可変であるよう固定可能に構成された請求項2に記載の短絡接地器具の電路側接続具。 The short circuit according to claim 2, wherein the head member is configured to be fixed so that an angular position around the axis of the operation rod is variable and an angular position around the axis orthogonal to the axis is also variable. Electrical circuit side connector for grounding equipment. 前記操作機構の端部には、操作絶縁棒の先端部が係合する回転軸が配置され、操作絶縁棒により前記回転軸を回転させて前記操作ロッドを移動させる請求項2又は請求項3に記載の短絡接地器具の電路側接続具。 The rotating shaft with which the front-end | tip part of an operation insulation rod engages is arrange | positioned at the edge part of the said operation mechanism, The said operation shaft is moved by rotating the said rotation shaft with an operation insulation rod. The electric circuit side connection tool of the short circuit earthing instrument of description. 前記操作機構の前記操作ロッドと前記回転軸との間には曲がり部が設けられており、前記操作ロッドの軸線と前記回転軸の軸線とは一定の角度で交わるよう構成された請求項4に記載の短絡接地器具の電路側接続具。 5. The bending portion is provided between the operation rod of the operation mechanism and the rotation shaft, and the axis of the operation rod and the axis of the rotation shaft intersect with each other at a constant angle. The electric circuit side connection tool of the short circuit earthing instrument of description. 前記曲がり部は、曲がり管とその曲がり管内に配置された複数のボールにより構成されており、前記回転軸を回転させ、前記ボールを介して前記操作ロッドを移動させる請求項5に記載の短絡接地器具の電路側接続具。 The short-circuit grounding according to claim 5, wherein the bent portion includes a bent pipe and a plurality of balls arranged in the bent pipe, and rotates the rotating shaft to move the operation rod via the ball. Electrical circuit side connector of equipment. 前記曲がり管内に配置された前記ボールは、前記曲がり管の内径より小さい直径を有し、前記曲がり管の内壁と前記ボールとの間には間隙が存在する請求項6に記載の短絡接地器具の電路側接続具。 The short-circuit grounding device according to claim 6, wherein the ball disposed in the bent pipe has a diameter smaller than an inner diameter of the bent pipe, and a gap exists between an inner wall of the bent pipe and the ball. Electric circuit side connector.
JP2005160304A 2005-05-31 2005-05-31 Short-circuiting/earthing device Withdrawn JP2006340456A (en)

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CN102074811A (en) * 2011-01-27 2011-05-25 宜兴市宜安电力工具制造有限公司 Portable power construction grounding device
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CN101916929A (en) * 2010-08-18 2010-12-15 蒋传东 Multi-angle rotary ground wire hitching device
CN102074811A (en) * 2011-01-27 2011-05-25 宜兴市宜安电力工具制造有限公司 Portable power construction grounding device
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CN102983539A (en) * 2012-11-08 2013-03-20 伊川县电业局 Electrification ground potential lighting arrester installation safe line card
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CN105206955B (en) * 2015-10-17 2017-07-11 国网安徽省电力公司检修公司 The high-altitude earthing or grounding means of hand-operated lifting
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