JP2011023267A

JP2011023267A - Protection cover for conductive member

Info

Publication number: JP2011023267A
Application number: JP2009168580A
Authority: JP
Inventors: Toru Suzuki; 徹鈴木; Koichi Nishikawa; 宏一西川; Masatoshi Komine; 正敏小峯
Original assignee: Osaki Electric Co Ltd
Current assignee: Osaki Electric Co Ltd
Priority date: 2009-07-17
Filing date: 2009-07-17
Publication date: 2011-02-03
Anticipated expiration: 2029-07-17
Also published as: JP5394152B2

Abstract

PROBLEM TO BE SOLVED: To provide a protection cover for a conductive member for protecting an electric wire or the like in exchanging an instrument without a risk of short-circuiting between different poles, easily and surely as well. SOLUTION: The protection cover for covering a conductive member to be connected with an instrument is capable of being elastically expanded in a length direction of the conductive member. COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、計器に接続される導電性部材を覆う保護カバーに関し、特に、電力量計等の計器の端子部に接続される電線等の導電性部材を短絡等から保護する、保護カバーに関する。 The present invention relates to a protective cover that covers a conductive member connected to a meter, and more particularly to a protective cover that protects a conductive member such as an electric wire connected to a terminal portion of a meter such as a watt hour meter from a short circuit or the like.

一般に、電力量計は検定期限が定められており、所定期間ごとの交換が義務付けられている。従来、電力量計と配電線との接続は、計器端子部の電線挿入穴に、電線を直接挿入するか、または、電線が接続された棒端子を電線挿入穴に接続することにより行われている。電力量計の交換時は、計器端子部から外された電線の裸線部または棒端子に絶縁キャップを被せることにより、異極同士の短絡を防止している。 In general, the watt hour meter has a set deadline for certification and is required to be replaced every predetermined period. Conventionally, the watt-hour meter and the distribution line are connected by directly inserting the electric wire into the electric wire insertion hole of the meter terminal portion or by connecting the rod terminal to which the electric wire is connected to the electric wire insertion hole. Yes. When the watt-hour meter is replaced, short-circuiting between different poles is prevented by covering the bare wire portion of the electric wire removed from the meter terminal portion or the rod terminal with an insulating cap.

しかし、上記従来の絶縁キャップでは、計器端子部から電線等を抜き、絶縁キャップを被せるまでの間、または電線等から絶縁キャップを外し、計器端子部に接続するまでの間に、異極同士を短絡させる可能性がある。また、絶縁キャップを取り付けることを、作業者が忘れる可能性がある。さらに、複数の電線等に対する絶縁キャップの取り付け、取り外し作業には手間がかかる。 However, in the above conventional insulation cap, the different polarities are not connected until the wire is removed from the instrument terminal and covered with the insulation cap, or until the insulation cap is removed from the wire and connected to the meter terminal. There is a possibility of short circuit. Also, the operator may forget to attach the insulating cap. Furthermore, it takes time to attach and remove the insulating cap to / from a plurality of electric wires.

実開平６−６４１６６号公報は、無停電による計器交換作業を容易にする、絶縁カバーを備えた電線接続装置を記載している。この装置では、電線の裸線部の長さを計器端子部の電線挿入穴の長さよりも大きくして、計器端子部に電線が接続された状態においても裸線部を露出させ、この露出した裸線部を絶縁カバーで覆っている。計器交換時は、手動で絶縁カバーを電線の絶縁被覆上に摺動させることにより、裸線部を露出させる。露出した裸線部に、同極どうしを短絡させる短絡装置を接続し、この状態で計器を交換する。これにより、無停電での計器交換時に従来必要とされていた、煩雑なバイパス工事を不要にすることができる。 Japanese Utility Model Laid-Open No. 6-64166 describes an electric wire connecting device provided with an insulating cover that facilitates an instrument replacement operation due to an uninterruptible power failure. In this device, the length of the bare wire portion of the electric wire is made larger than the length of the wire insertion hole of the instrument terminal portion, and the bare wire portion is exposed even when the electric wire is connected to the instrument terminal portion. The bare wire is covered with an insulating cover. When the instrument is replaced, the bare wire portion is exposed by manually sliding the insulating cover over the insulating coating of the electric wire. A short-circuit device that short-circuits the same poles is connected to the exposed bare wire portion, and the instrument is exchanged in this state. Thereby, the complicated bypass construction conventionally required at the time of instrument exchange at the time of uninterruptible power can be made unnecessary.

しかし、この電線接続装置では、短絡装置を外した後、再び絶縁カバーを摺動させて裸線部を覆うことを作業者が忘れる虞がある。また、絶縁カバーの摺動を常に作業者が手動で行う必要があるため、手間がかかる。
実開平６−６４１６６号 However, in this electric wire connecting device, after removing the short-circuit device, the operator may forget to slide the insulating cover again to cover the bare wire portion. Moreover, since it is always necessary for the operator to manually slide the insulating cover, it takes time and effort.
ACT 6-64166

このような従来技術の問題点に鑑み、本発明の目的は、計器交換時に、異極同士を短絡させる虞なく容易且つ確実に電線等を保護する、導電性部材の保護カバーを提供することである。本発明の他の目的は、煩雑なバイパス工事を行うことなく無停電での計器交換作業を容易にし、且つ、計器交換作業終了後も確実に電線等を保護することができる、導電性部材の保護カバーを提供することにある。 In view of such problems of the prior art, an object of the present invention is to provide a protective cover for a conductive member that easily and reliably protects an electric wire or the like without the possibility of short-circuiting between different poles at the time of instrument replacement. is there. Another object of the present invention is to provide an electrically conductive member that facilitates an uninterruptible instrument replacement operation without complicated bypass construction, and can reliably protect electric wires and the like even after the instrument replacement operation is completed. It is to provide a protective cover.

請求項１の発明によれば、計器に接続される導電性部材を覆う保護カバーであって、前記導電性部材の長さ方向に沿って弾性的に伸縮可能である、保護カバーが提供される。この構成によれば、保護カバーを導電性部材の計器側端部に取り付けて、計器の端子部に対する導電性部材の抜き差しの動きに合わせて、保護カバーを伸縮させることができる。これにより、計器交換時、作業者が絶縁キャップを着脱していた手間を省くことができる。また、保護カバーの弾性的な伸縮によって確実に導電性部材を覆うことができるので、計器交換時に異極同士を短絡させる虞がない。また、複数の導電性部材を、計器端子部から同時に引き抜くことができる。 According to invention of Claim 1, it is a protective cover which covers the electroconductive member connected to a meter, Comprising: The protective cover which can be elastically expanded-contracted along the length direction of the said electroconductive member is provided. . According to this configuration, the protective cover can be attached to the instrument-side end of the conductive member, and the protective cover can be expanded and contracted in accordance with the movement of the conductive member with respect to the terminal portion of the instrument. As a result, it is possible to save the labor of attaching and detaching the insulating cap when the instrument is replaced. Further, since the conductive member can be reliably covered by the elastic expansion and contraction of the protective cover, there is no possibility of short-circuiting between the different poles when replacing the instrument. In addition, a plurality of conductive members can be pulled out from the instrument terminal portion at the same time.

請求項２の発明によれば、請求項１の発明において、前記保護カバーが、蛇腹形状を備えている。この構成によれば、別個の弾性部材を用いることなく、保護カバーの蛇腹形状によって、保護カバーを導電性部材の長さ方向に沿って弾性的に伸縮させることができる。これにより、保護カバーを導電性部材の計器側端部に取り付けて、計器の端子部に対する導電性部材の抜き差しの動きに合わせて、保護カバーを伸縮させることができる。これにより、計器交換時、作業者が絶縁キャップを着脱していた手間を省くことができる。また、保護カバーの弾性的な伸縮によって確実に導電性部材を覆うことができるので、計器交換時に異極同士を短絡させる虞がない。また、複数の導電性部材を、計器端子部から同時に引き抜くことができる。 According to the invention of claim 2, in the invention of claim 1, the protective cover has a bellows shape. According to this configuration, the protective cover can be elastically expanded and contracted along the length direction of the conductive member by the bellows shape of the protective cover without using a separate elastic member. Thereby, a protective cover can be attached to the instrument side edge part of an electroconductive member, and a protective cover can be expanded-contracted according to the movement of the insertion / extraction of the electroconductive member with respect to the terminal part of an instrument. As a result, it is possible to save the labor of attaching and detaching the insulating cap when the instrument is replaced. Further, since the conductive member can be reliably covered by the elastic expansion and contraction of the protective cover, there is no possibility of short-circuiting between the different poles when replacing the instrument. In addition, a plurality of conductive members can be pulled out from the instrument terminal portion at the same time.

請求項３の発明によれば、請求項２の発明において、前記保護カバーは、渦巻状に巻かれた形態を有しており、これにより、前記保護カバーは、該保護カバーの周方向に沿って拡張及び収縮可能である。この構成によれば、導電性部材が計器端子部に接続された状態のままでも、保護カバーを装着することができる。また、異なる太さの導電性部材にも使用することができる。 According to a third aspect of the invention, in the second aspect of the invention, the protective cover has a spirally wound form, whereby the protective cover is arranged along a circumferential direction of the protective cover. Can be expanded and contracted. According to this configuration, the protective cover can be mounted even when the conductive member remains connected to the instrument terminal portion. It can also be used for conductive members having different thicknesses.

請求項４の発明によれば、請求項１の発明において、前記保護カバーが、前記導電性部材の長さ方向に沿って直列に配置される第１の管状部材及び第２の管状部材と、前記第１及び第２の管状部材の間に配置される弾性部材とを備えており、前記第１及び第２の管状部材は、前記弾性部材を介して互いに対して摺動可能である。この構成によれば、保護カバーを形成する第１及び第２の管状部材を、弾性部材を介して、導電性部材の長さ方向に互いに対して摺動させることにより、保護カバーを弾性的に伸縮させることができる。これにより、保護カバーを、計器に接続される電線等の導電性部材の端部に取り付けて、計器の端子部に対する導電性部材の抜き差しの動きに合わせて伸縮させることができる。これにより、計器交換時、作業者が絶縁キャップを着脱していた手間を省くことができる。また、保護カバーの弾性的な伸縮によって確実に導電性部材を覆うことができるので、計器交換時に異極同士を短絡させる虞がない。また、複数の導電性部材を、計器端子部から同時に引き抜くことができる。 According to the invention of claim 4, in the invention of claim 1, the protective cover is a first tubular member and a second tubular member that are arranged in series along the length direction of the conductive member; And an elastic member disposed between the first and second tubular members, and the first and second tubular members are slidable relative to each other via the elastic member. According to this configuration, the first and second tubular members forming the protective cover are slid relative to each other in the length direction of the conductive member via the elastic member, whereby the protective cover is elastically moved. Can be expanded and contracted. Thereby, a protective cover can be attached to the edge part of electroconductive members, such as an electric wire connected to a meter, and can be expanded-contracted according to the movement of the conductive member with respect to the terminal part of a meter. As a result, it is possible to save the labor of attaching and detaching the insulating cap when the instrument is replaced. Further, since the conductive member can be reliably covered by the elastic expansion and contraction of the protective cover, there is no possibility of short-circuiting between the different poles when replacing the instrument. In addition, a plurality of conductive members can be pulled out from the instrument terminal portion at the same time.

請求項５の発明によれば、請求項４の発明において、前記弾性部材がばねを備えている。 According to the invention of claim 5, in the invention of claim 4, the elastic member comprises a spring.

請求項６の発明によれば、請求項１乃至５のいずれか一項に記載の発明において、前記導電性部材が配電線を備えており、前記保護カバーは前記配電線を覆うようになされている。 According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the conductive member includes a distribution line, and the protective cover covers the distribution line. Yes.

請求項７の発明によれば、請求項６の発明において、前記導電性部材が、更に、棒端子を備えており、前記保護カバーは前記棒端子を覆うようになされている。 According to the invention of claim 7, in the invention of claim 6, the conductive member further includes a bar terminal, and the protective cover covers the bar terminal.

本発明によれば、計器交換時に、異極同士を短絡させる虞なく容易且つ確実に電線等を保護する、導電性部材の保護カバーを提供することができる。さらに、煩雑なバイパス工事を行うことなく無停電での計器交換作業を容易にし、且つ、計器交換作業終了後も確実に電線等を保護することができる、導電性部材の保護カバーを提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the protection cover of an electroconductive member which protects an electric wire etc. easily and reliably without the possibility of short-circuiting different poles at the time of instrument replacement | exchange can be provided. Furthermore, it is intended to provide a protective cover for a conductive member that facilitates instrument replacement work without a power failure without complicated bypass construction, and can reliably protect electric wires and the like even after the instrument replacement work is completed. Can do.

（Ａ）は、本発明の第一実施形態による保護カバーの伸長状態を示す斜視図であり、（Ｂ）は、本発明の第一実施形態による保護カバーの収縮状態を示す斜視図である。(A) is a perspective view which shows the expansion | extension state of the protective cover by 1st embodiment of this invention, (B) is a perspective view which shows the contraction state of the protective cover by 1st embodiment of this invention. （Ａ）は、図１（Ａ）に示す保護カバーの、内側端部を除いた切欠斜視図であり、（Ｂ）は、図１（Ｂ）に示す保護カバーの、内側端部を除いた切欠斜視図である。(A) is a cutaway perspective view of the protective cover shown in FIG. 1 (A) with the inner end removed, and (B) is the protective cover shown in FIG. 1 (B) with the inner end removed. It is a notch perspective view. 第一実施形態の保護カバーの端面図である。It is an end view of the protective cover of 1st embodiment. 第一実施形態の保護カバーが取り付けられた配電線を、計器端子部に接続した状態を示す正面図である。It is a front view which shows the state which connected the distribution line with which the protective cover of 1st embodiment was attached to the instrument terminal part. 第一実施形態の保護カバーの使用方法を説明する図である。It is a figure explaining the usage method of the protective cover of 1st embodiment. 第一実施形態の保護カバーを用いた、無停電での計器交換方法を示す図である。It is a figure which shows the instrument replacement | exchange method in the uninterruptible power supply using the protective cover of 1st embodiment. 本発明の第二実施形態による保護カバーに用いられる棒端子の例を配電線と共に示す図であり、（Ａ）はねじ接続用棒端子、（Ｂ）は圧着接続用棒端子、（Ｃ）は圧縮接続用棒端子である。It is a figure which shows the example of the bar terminal used for the protective cover by 2nd embodiment of this invention with a distribution line, (A) is a screw connection bar terminal, (B) is a crimping connection bar terminal, (C) is It is a bar terminal for compression connection. （Ａ）は、本発明の第二実施形態による保護カバーの伸長状態を示す斜視図であり、（Ｂ）は、本発明の第二実施形態による保護カバーの収縮状態を示す斜視図である。(A) is a perspective view which shows the expansion | extension state of the protection cover by 2nd embodiment of this invention, (B) is a perspective view which shows the contraction state of the protection cover by 2nd embodiment of this invention. （Ａ）は、図８（Ａ）に示す保護カバーの切欠斜視図であり、（Ｂ）は、図８（Ｂ）に示す保護カバーの切欠斜視図である。(A) is a cutaway perspective view of the protective cover shown in FIG. 8 (A), and (B) is a cutaway perspective view of the protective cover shown in FIG. 8 (B). 第二実施形態の保護カバーの伸長状態（通常状態）を示す断面図である。It is sectional drawing which shows the expansion | extension state (normal state) of the protective cover of 2nd embodiment. 第二実施形態の保護カバーが取り付けられた配電線を、計器端子部に接続した状態を示す正面図である。It is a front view which shows the state which connected the distribution line with which the protective cover of 2nd embodiment was attached to the instrument terminal part. 第二実施形態の保護カバーの使用方法を説明する図である。It is a figure explaining the usage method of the protective cover of 2nd embodiment. 第二実施形態の保護カバーを用いた、無停電での計器交換方法を示す図である。It is a figure which shows the instrument exchange method in the uninterruptible power supply using the protective cover of 2nd embodiment.

以下、添付図面を参照して、本発明の実施形態を説明する。 Embodiments of the present invention will be described below with reference to the accompanying drawings.

［第一実施形態］
図１乃至図６を参照して、本発明の第一実施形態による、導電性部材の保護カバー１を説明する。本発明の保護カバーは、樹脂等の非導電性材料により形成され、計器に接続される導電性部材に好適に用いることができ、特に、導電性部材の長さ方向に沿って弾性的に伸縮可能である点に特徴がある。図１（Ａ）は、導電性部材としての配電線２に取り付けられた保護カバー１の、伸長状態を示す斜視図である。図１（Ｂ）は、保護カバー１の収縮状態を示す斜視図である。理解の容易のため、図１（Ａ）及び図１（Ｂ）では、保護カバー１によって覆われる配電線２の部分を破線で示している。図２（Ａ）、図２（Ｂ）は、それぞれ、図１（Ａ）、図１（Ｂ）に示す保護カバー１の内部を詳細に示すために、保護カバー１の一部（後述する内側端部４）を除いた切欠斜視図である。 [First embodiment]
With reference to FIG. 1 thru | or FIG. 6, the protective cover 1 of an electroconductive member by 1st embodiment of this invention is demonstrated. The protective cover of the present invention is formed of a non-conductive material such as a resin, and can be suitably used for a conductive member connected to a meter. In particular, the protective cover elastically expands and contracts along the length direction of the conductive member. It is characterized in that it is possible. FIG. 1A is a perspective view showing an extended state of a protective cover 1 attached to a distribution line 2 as a conductive member. FIG. 1B is a perspective view showing a contracted state of the protective cover 1. For easy understanding, in FIG. 1 (A) and FIG. 1 (B), the portion of the distribution line 2 covered by the protective cover 1 is indicated by a broken line. 2 (A) and 2 (B) show parts of the protective cover 1 (inside which will be described later) in order to show in detail the inside of the protective cover 1 shown in FIGS. 1 (A) and 1 (B), respectively. It is a notch perspective view except the edge part 4).

図１（Ａ）及び図１（Ｂ）に示すように、第一実施形態による保護カバー１は、配電線２の長さ方向に沿って、蛇腹を形成する蛇腹形状部１Ｂと、蛇腹形状部１Ｂの両端部に形成された実質的に円筒状の円筒端部１Ａ、１Ｃを備えている。保護カバー１は、蛇腹形状部１Ｂの作用によって、配電線２の長さ方向に弾性的に伸縮可能である。尚、蛇腹形状部１Ｂの段数（山部及び谷部の数）は特に限られない。 As shown in FIGS. 1 (A) and 1 (B), the protective cover 1 according to the first embodiment includes a bellows-shaped portion 1B that forms a bellows along the length direction of the distribution line 2, and a bellows-shaped portion. 1B includes substantially cylindrical cylindrical end portions 1A and 1C formed at both end portions of 1B. The protective cover 1 can elastically expand and contract in the length direction of the distribution line 2 by the action of the bellows-shaped portion 1B. The number of steps of the bellows-shaped portion 1B (the number of peaks and valleys) is not particularly limited.

保護カバー１は、円筒端部１Ａ、１Ｃのいずれか一方（本実施形態では円筒端部１Ｃ）を配電線２の絶縁シース２Ｂに、粘着テープまたは接着剤等により固定することによって、配電線２に固定される。絶縁シース２Ｂにおける円筒端部１Ａまたは円筒端部１Ｃの取付位置は、保護カバー１を伸長させると配電線２の裸線部２Ａを完全に覆うことができ（図１（Ａ）、図２（Ａ））、保護カバー１を収縮させると裸線部２Ａの少なくとも所定の長さ（計器端子部への接続に必要な長さ）を外部に露出させることができる（図１（Ｂ）、図２（Ｂ））ように決められる。 The protective cover 1 has one of the cylindrical end portions 1A and 1C (in this embodiment, the cylindrical end portion 1C) fixed to the insulating sheath 2B of the distribution line 2 with an adhesive tape or an adhesive, thereby distributing the distribution line 2 Fixed to. The attachment position of the cylindrical end 1A or the cylindrical end 1C in the insulating sheath 2B can completely cover the bare wire portion 2A of the distribution line 2 when the protective cover 1 is extended (FIG. 1 (A), FIG. 2 ( A)) When the protective cover 1 is contracted, at least a predetermined length of the bare wire portion 2A (a length necessary for connection to the instrument terminal portion) can be exposed to the outside (FIG. 1B). 2 (B)).

保護カバー１を、円筒端部１Ａから見た端面図を図３に示す。図３では、保護カバー１の内側に配置される配電線２は示されていない。図３に示すように、第一実施形態の保護カバー１は、通常、渦巻状に巻かれた形態を有している。具体的には、保護カバー１は、保護カバー１の周方向（図３の矢印方向）に沿って少なくとも部分的に重なり合う、外側端部３と内側端部４を有している。外側端部３と内側端部４は、互いに対して固定されていない。これにより、保護カバー１を、その周方向に沿って拡張及び収縮させることができる。従って、既に計器端子部に接続された状態の配電線２に、配電線２を計器端子部から外すことなく、保護カバー１を取り付けることができる。具体的には、外側端部３と内側端部４を互いに離間させるように保護カバー１を周方向に拡張し、これにより外側端部３と内側端部４の間に形成される開口部を通して配電線２を保護カバー１内に挿入することができる。従って、例えば、保護カバー１が破損した場合などには、配電線２を計器端子部から外すことなく、保護カバー１を交換することができる。尚、既に計器端子部に接続されている配電線２に保護カバー１を取り付ける際は、保護カバー１を収縮させた状態に保持し、伸長時に配電線２の裸線部２Ａを完全に覆うことができる位置で、保護カバー１の円筒端部１Ａまたは１Ｃを絶縁シース２Ｂに固定する必要がある。 An end view of the protective cover 1 as viewed from the cylindrical end 1A is shown in FIG. In FIG. 3, the distribution line 2 arranged inside the protective cover 1 is not shown. As shown in FIG. 3, the protective cover 1 of the first embodiment usually has a form wound in a spiral shape. Specifically, the protective cover 1 has an outer end portion 3 and an inner end portion 4 that overlap at least partially along the circumferential direction of the protective cover 1 (the arrow direction in FIG. 3). The outer end 3 and the inner end 4 are not fixed with respect to each other. Thereby, the protective cover 1 can be expanded and contracted along the circumferential direction. Therefore, the protective cover 1 can be attached to the distribution line 2 already connected to the instrument terminal part without removing the distribution line 2 from the instrument terminal part. Specifically, the protective cover 1 is expanded in the circumferential direction so that the outer end portion 3 and the inner end portion 4 are separated from each other, thereby passing through an opening formed between the outer end portion 3 and the inner end portion 4. The distribution line 2 can be inserted into the protective cover 1. Therefore, for example, when the protective cover 1 is damaged, the protective cover 1 can be replaced without removing the distribution line 2 from the instrument terminal portion. In addition, when attaching the protective cover 1 to the distribution line 2 already connected to the instrument terminal part, hold the protective cover 1 in a contracted state and completely cover the bare wire part 2A of the distribution line 2 when extended. It is necessary to fix the cylindrical end 1A or 1C of the protective cover 1 to the insulating sheath 2B at a position where the protective cover 1 can be formed.

また、このように保護カバー１を、互いに固定されることなく重なり合う外側端部３及び内側端部４を備えた渦巻状に形成することによって、保護カバー１の配電線２に対する巻き付け具合を調整することができる。従って、同じ保護カバー１を太さの異なる電線に使用することができる。しかし、本発明では、渦巻状に形成された保護カバー１の外側端部３と内側端部４は、互いに固定されていてもよい。また、保護カバー１は、外側端部３と内側端部４を有することなく、保護カバー１が周方向に切れ目無く連続した側面を形成する一体成形品であってもよい。 Moreover, the winding condition of the protective cover 1 around the distribution line 2 is adjusted by forming the protective cover 1 in a spiral shape having the outer end portion 3 and the inner end portion 4 that overlap without being fixed to each other. be able to. Therefore, the same protective cover 1 can be used for electric wires having different thicknesses. However, in the present invention, the outer end 3 and the inner end 4 of the protective cover 1 formed in a spiral shape may be fixed to each other. Further, the protective cover 1 may be an integrally molded product that does not have the outer end portion 3 and the inner end portion 4 and that forms a side surface in which the protective cover 1 is continuous in the circumferential direction.

次に、図４乃至図６を参照して、第一実施形態の保護カバー１の使用方法について具体的に説明する。図４は、保護カバー１が取り付けられた配電線２を電力量計の計器端子部１０に接続した状態を示す正面図である。図４には、計器端子部１０から外された状態の配電線２（１Ｓ）も示している。他の配電線２（２Ｓ、３Ｓ、３Ｌ、２Ｌ、１Ｌ）は計器端子部１０に接続された状態にある。図４に示されるように、計器端子部１０から外された状態の配電線２（１Ｓ）の保護カバー１は伸長状態にあり、配電線２の裸線部２Ａを完全に覆っている。計器端子部１０に接続された配電線２（２Ｓ、３Ｓ、３Ｌ、２Ｌ、１Ｌ）は、電線挿入穴１１内でねじ１２により固定されており、保護カバー１は、蛇腹形状部１Ｂが収縮した状態にある。 Next, with reference to FIG. 4 thru | or FIG. 6, the usage method of the protective cover 1 of 1st embodiment is demonstrated concretely. FIG. 4 is a front view showing a state in which the distribution line 2 to which the protective cover 1 is attached is connected to the meter terminal portion 10 of the watt-hour meter. FIG. 4 also shows the distribution line 2 (1S) in a state where it is removed from the instrument terminal portion 10. The other distribution lines 2 (2S, 3S, 3L, 2L, 1L) are connected to the instrument terminal unit 10. As shown in FIG. 4, the protective cover 1 of the distribution line 2 (1 S) removed from the instrument terminal unit 10 is in an extended state and completely covers the bare wire part 2 A of the distribution line 2. The distribution line 2 (2S, 3S, 3L, 2L, 1L) connected to the instrument terminal portion 10 is fixed by the screw 12 in the wire insertion hole 11, and the protective cover 1 is contracted by the bellows-shaped portion 1B. Is in a state.

図５（Ａ）（Ｂ）は、保護カバー１の使用方法を説明する図であり、計器端子部１０と保護カバー１が断面図で示されている。図５（Ａ）は配電線２が計器端子部１０から外されて、裸線部２Ａが保護カバー１によって保護された状態を示し（図４の配電線１Ｓに対応）、図５（Ｂ）は、配電線２が、計器端子部１０に接続された状態を示す（図４の配電線２Ｓ、３Ｓ、１Ｌ、２Ｌ、３Ｌに対応）。計器端子部１０に配電線２を接続する際、図５（Ａ）に示すように、伸長状態の保護カバー１が取り付けられた配電線２が、計器端子部１０の電線挿入穴１１に接近させられる。裸線部２Ａの先端を完全に覆っている保護カバー１の円筒端部１Ａは、裸線部２Ａと共に、電線挿入穴１１の大径部１１Ａ内に進入する。電線挿入穴１１は、計器端子部１０の非導通部に形成された大径部１１Ａと、導通部に形成された小径部１１Ｃと、大径部１１Ａから小径部１１Ｃにかけて形成されるテーパー部１１Ｂとを有している。このため、大径部１１Ａに進入した円筒端部１Ａは、テーパー部１１Ｂによって電線挿入穴１１へのさらなる進入が阻止され、大径部１１Ａ内に保持される。この状態でさらに力を加えると、保護カバー１の蛇腹形状部１Ｂは、大径部１１Ａ内に保持された円筒端部１Ａと、配電線２の絶縁シース２Ｂに固定された円筒端部１Ｃとの間で、配電線２の長さ方向に収縮する。これにより、配電線２の裸線部２Ａのみが電線挿入穴１１の小径部１１Ｃに進入する。裸線部２Ａが小径部１１Ｃに十分挿入されると、小径部１１Ｃ内のねじ１２によって、裸線部２Ａが電線挿入穴１１にねじ止めされる。こうして、図５（Ｂ）に示されるように、保護カバー１は、収縮状態で計器端子部１０と配電線２の間に保持される。 5 (A) and 5 (B) are diagrams for explaining how to use the protective cover 1, and the instrument terminal portion 10 and the protective cover 1 are shown in cross-sectional views. FIG. 5A shows a state in which the distribution line 2 is removed from the instrument terminal portion 10 and the bare wire portion 2A is protected by the protective cover 1 (corresponding to the distribution line 1S in FIG. 4). Shows a state in which the distribution line 2 is connected to the instrument terminal portion 10 (corresponding to the distribution lines 2S, 3S, 1L, 2L, and 3L in FIG. 4). When connecting the distribution line 2 to the instrument terminal portion 10, as shown in FIG. 5A, the distribution line 2 with the extended protective cover 1 attached is brought close to the wire insertion hole 11 of the instrument terminal portion 10. It is done. The cylindrical end portion 1A of the protective cover 1 that completely covers the end of the bare wire portion 2A enters the large diameter portion 11A of the wire insertion hole 11 together with the bare wire portion 2A. The wire insertion hole 11 includes a large diameter portion 11A formed in the non-conductive portion of the instrument terminal portion 10, a small diameter portion 11C formed in the conductive portion, and a tapered portion 11B formed from the large diameter portion 11A to the small diameter portion 11C. And have. For this reason, the cylindrical end portion 1A that has entered the large-diameter portion 11A is prevented from further entering the wire insertion hole 11 by the tapered portion 11B and is held in the large-diameter portion 11A. When further force is applied in this state, the bellows-shaped portion 1B of the protective cover 1 includes a cylindrical end portion 1A held in the large diameter portion 11A, and a cylindrical end portion 1C fixed to the insulating sheath 2B of the distribution line 2. Between them, the distribution line 2 contracts in the length direction. As a result, only the bare wire portion 2 A of the distribution line 2 enters the small diameter portion 11 C of the wire insertion hole 11. When the bare wire portion 2 A is sufficiently inserted into the small diameter portion 11 C, the bare wire portion 2 A is screwed into the electric wire insertion hole 11 by the screw 12 in the small diameter portion 11 C. Thus, as shown in FIG. 5B, the protective cover 1 is held between the instrument terminal portion 10 and the distribution line 2 in a contracted state.

配電線２を計器端子部１０から外す場合は、ねじ１２を緩めて裸線部２Ａを電線挿入穴１１から引き出す。この時、蛇腹形状部１Ｂの弾性力によって、保護カバー１が自然に（換言すれば自動的に）伸長する。従って、裸線部２Ａが電線挿入穴１１から引き出されると同時に、裸線部２Ａの周囲は、再び、図５（Ａ）に示されるように保護カバー１によって完全に覆われる。 When removing the distribution line 2 from the instrument terminal portion 10, the screw 12 is loosened and the bare wire portion 2 A is pulled out from the wire insertion hole 11. At this time, the protective cover 1 naturally extends (in other words, automatically) by the elastic force of the bellows-shaped portion 1B. Therefore, at the same time that the bare wire portion 2A is pulled out from the wire insertion hole 11, the periphery of the bare wire portion 2A is again completely covered with the protective cover 1 as shown in FIG.

尚、配電線２を計器端子部１０に接続させる際、保護カバー１の円筒端部１Ａは、必ずしも電線挿入穴１１の大径部１１Ａ内に保持されなくともよく、円筒端部１Ａの端面が、計器端子部１０における電線挿入穴１１周囲の壁面に当接するようになされていてもよい。また、円筒端部１Ａを省略して、蛇腹形状部１Ｂを計器端子部１０の壁面に当接させるようにしてもよい。しかし、上記のように円筒端部１Ａを大径部１１Ａ内に保持することにより、保護カバー１の計器端子部１０に対する位置が安定し、従って、保護カバー１を取り付けた配電線２の抜き差し作業を、円滑に行なうことができる。 When connecting the distribution line 2 to the instrument terminal portion 10, the cylindrical end 1 A of the protective cover 1 does not necessarily have to be held in the large-diameter portion 11 A of the wire insertion hole 11, and the end face of the cylindrical end 1 A is The instrument terminal portion 10 may be in contact with the wall surface around the wire insertion hole 11. Further, the cylindrical end portion 1A may be omitted, and the bellows-shaped portion 1B may be brought into contact with the wall surface of the instrument terminal portion 10. However, by holding the cylindrical end 1A in the large-diameter portion 11A as described above, the position of the protective cover 1 relative to the instrument terminal portion 10 is stabilized, and therefore the work of inserting / removing the distribution line 2 with the protective cover 1 attached thereto is performed. Can be performed smoothly.

また、上述のように円筒端部１Ｃは、保護カバー１を絶縁シース２Ｂに固定する際の固定部として、粘着テープを貼り付けたり、接着剤等を塗布するために用いることができる。従って、円筒端部１Ｃにより、保護カバー１の絶縁シース２Ｂへの固定を容易に行なうことができる。しかし、円筒端部１Ｃはなくてもよく、その場合は、蛇腹形状部１Ｂの端部を絶縁シース２Ｂに固定する。 Further, as described above, the cylindrical end 1C can be used as a fixing part when the protective cover 1 is fixed to the insulating sheath 2B, for attaching an adhesive tape or applying an adhesive or the like. Accordingly, the cylindrical cover 1C can easily fix the protective cover 1 to the insulating sheath 2B. However, the cylindrical end 1C may not be provided, and in that case, the end of the bellows-shaped portion 1B is fixed to the insulating sheath 2B.

このように、第一実施形態の保護カバー１は、計器端子部１０に対する配電線２等の導電性部材の抜き差しの動きに合わせて、自動的に伸縮させることができる。従って、作業者が絶縁キャップを着脱する等の手間が不要であり、また、計器交換等の作業中に配電線２の裸線部２Ａを外部に露出させることを確実に防止することができる。従って、異極同士を短絡させる虞なく、容易且つ確実に導電性部材を保護することができ、計器交換作業等を効率的に行なうことができる。尚、上記実施形態では、保護カバー１に覆われる導電性部材として配電線２を示しているが、例えば、配電線２の裸線部２Ａに棒端子を取り付けて、棒端子を覆うようにして用いることもできる。 Thus, the protective cover 1 of the first embodiment can be automatically expanded and contracted in accordance with the movement of the conductive member such as the distribution line 2 with respect to the meter terminal portion 10. Accordingly, it is not necessary for the operator to attach and detach the insulating cap, and it is possible to reliably prevent the bare wire portion 2A of the distribution line 2 from being exposed to the outside during work such as instrument replacement. Therefore, it is possible to easily and reliably protect the conductive member without fear of short-circuiting the different poles, and it is possible to efficiently perform instrument exchange work and the like. In addition, in the said embodiment, although the distribution line 2 is shown as an electroconductive member covered with the protective cover 1, for example, a bar terminal is attached to the bare wire part 2A of the distribution line 2 so that a bar terminal may be covered. It can also be used.

図６に第一実施形態の保護カバー１を用いた、無停電での計器交換作業の例を示す。この場合、電線２の裸線部２Ａの長さが電線挿入穴１１の長さよりも大きくされており、保護カバー１は、大きな長さの裸線部２Ａを完全に覆う長さを有している点を除いて、図５に示すものと同様である。図６（Ａ）は、計器交換作業の前後に配電線２が計器端子部１０に接続された状態を示し、図６（Ｂ）は、無停電での計器交換作業中に保護カバー１をさらに収縮させた状態を示す。図６（Ａ）に示す接続状態で、保護カバー１は収縮状態にあり且つ電線挿入穴１１から突出する裸線部２Ａの部分を覆っている。計器交換時は、図６（Ｂ）に示すように、保護カバー１を、直接作業者の手によりまたは適当な工具を用いてさらに収縮させ、裸線部２Ａの、電線挿入穴１１から突出する部分を外部に露出させる。露出させた裸線部２Ａの部分に、同極の配電線同士を短絡させるためのバイパス装置３０を接続する。計器交換作業終了後、バイパス装置３０を外すと同時に保護カバー１は計器端子部１０に向けて伸長し、再び図６（Ａ）の状態に戻る。 FIG. 6 shows an example of an instrument replacement operation without a power failure using the protective cover 1 of the first embodiment. In this case, the length of the bare wire portion 2A of the electric wire 2 is larger than the length of the electric wire insertion hole 11, and the protective cover 1 has a length that completely covers the large length of the bare wire portion 2A. Except for this point, it is the same as that shown in FIG. FIG. 6 (A) shows a state in which the distribution line 2 is connected to the instrument terminal section 10 before and after the instrument replacement work, and FIG. 6 (B) shows that the protective cover 1 is further attached during the instrument replacement work without uninterruptible power. The contracted state is shown. In the connection state shown in FIG. 6A, the protective cover 1 is in a contracted state and covers the bare wire portion 2 A protruding from the wire insertion hole 11. When replacing the instrument, as shown in FIG. 6B, the protective cover 1 is further contracted directly by the operator's hand or using an appropriate tool, and protrudes from the wire insertion hole 11 of the bare wire portion 2A. Expose the part to the outside. A bypass device 30 for short-circuiting the same-polarity distribution lines is connected to the exposed bare wire portion 2A. After the instrument replacement work is completed, the protective cover 1 extends toward the instrument terminal section 10 at the same time that the bypass device 30 is removed, and the state returns to the state shown in FIG.

このように、第一実施形態の保護カバー１を用いることにより、煩雑なバイパス工事を行なうことなく無停電での計器交換作業を容易に行なうことができる。さらに、計器交換作業終了後も、保護カバー１が自動的に伸長することにより確実に導電性部材を保護することができるので、異極同士を短絡させる等の虞がない。 As described above, by using the protective cover 1 of the first embodiment, it is possible to easily perform an instrument replacement operation without a power failure without performing a complicated bypass construction. Furthermore, even after the instrument replacement operation is completed, the conductive cover can be reliably protected by automatically extending the protective cover 1, so there is no possibility of short-circuiting the different poles.

［第二実施形態］
図７乃至図１３を参照して、本発明の第二実施形態による、導電性部材の保護カバー１０１を説明する。第二実施形態は、特に、保護カバー１０１に覆われる導電性部材として、配電線２００に接続される棒端子１０５を例として説明する。しかし、第二実施形態の保護カバー１０１は、棒端子１０５を介することなく配電線２００の裸線部２００Ａを直接覆うようにして使用することもできる。図７（Ａ）乃至（Ｃ）は、第二実施形態の保護カバー１０１によって保護される棒端子１０５の例を配電線２００と共に示している。（Ａ）はねじ接続用棒端子であり、配電線２００の裸線部２００Ａ（図示せず）は、ねじ接続により棒端子１０５に接続されている。（Ｂ）は圧着端子であり、配電線２００の裸線部２００Ａは、棒端子１０５の圧着部で圧着により接続される。（Ｃ）は圧縮端子であり、配電線２００の裸線部２００Ａ（図示せず）は、棒端子１０５の圧縮部で圧縮により接続される。以下に説明する例では、棒端子１０５として図７（Ｂ）に示す圧着端子を用いて説明する。 [Second Embodiment]
With reference to FIG. 7 thru | or FIG. 13, the protective cover 101 of an electroconductive member by 2nd embodiment of this invention is demonstrated. In the second embodiment, a bar terminal 105 connected to the distribution line 200 will be described as an example as a conductive member covered with the protective cover 101 in particular. However, the protective cover 101 of the second embodiment can also be used so as to directly cover the bare wire portion 200 A of the distribution line 200 without using the bar terminal 105. 7A to 7C show an example of the bar terminal 105 protected by the protective cover 101 of the second embodiment together with the distribution line 200. FIG. (A) is a rod terminal for screw connection, and the bare wire portion 200A (not shown) of the distribution line 200 is connected to the rod terminal 105 by screw connection. (B) is a crimp terminal, and the bare wire portion 200 A of the distribution line 200 is connected by crimping at the crimp portion of the bar terminal 105. (C) is a compression terminal, and the bare wire portion 200 A (not shown) of the distribution line 200 is connected by compression at the compression portion of the bar terminal 105. In the example described below, a crimp terminal shown in FIG.

図８（Ａ）は、導電性部材としての棒端子１０５に取り付けられた保護カバー１０１の、伸長状態を示す斜視図であり、図８（Ｂ）は、保護カバー１０１の収縮状態を示す斜視図である。第二実施形態の保護カバー１０１は、配電線２００の長さ方向に沿って直列に配置される第１の管状部材１０１Ａ及び第２の管状部材１０１Ｂと、第１及び第２の管状部材１０１Ａ、１０１Ｂの間に配置される弾性部材１０４とを備えており、第１及び第２の管状部材１０１Ａ、１０１Ｂは、弾性部材１０４を介して互いに対して摺動可能である。本実施形態では、弾性部材はばねを備えており、図示の例では、特に、コイルばね１０４を備えている。保護カバー１０１は、コイルばね１０４の作用によって、配電線２００の長さ方向に弾性的に伸縮可能である。しかし、本発明に用いられる弾性部材は、コイルばね１０４等のばねには限られず、例えば蛇腹部材等の他の弾性部材を用いることもできる。理解の容易のため、図８（Ａ）及び図８（Ｂ）では、保護カバー１０１によって覆われる配電線２００の部分と棒端子１０５、及びコイルばね１０４は破線で示している。図９（Ａ）、図９（Ｂ）は、それぞれ、図８（Ａ）、図８（Ｂ）に示す保護カバー１０１の内部を詳細に示すように保護カバー１０１の一部を除いた切欠斜視図である。保護カバー１０１は、通常、コイルばね１０４によって伸長状態にある。保護カバー１０１は、伸長状態で棒端子１０５を完全に覆うことができるように（図８（Ａ）、図９（Ａ））、且つ、収縮状態で少なくとも棒端子１０５の棒部の所定の長さ（計器端子部への接続に必要な長さ）を外部に露出させることができるように（図８（Ｂ）、図９（Ｂ））、粘着テープまたは接着剤等によって配電線２００の絶縁シース２００Ｂに固定される。 FIG. 8A is a perspective view showing an extended state of the protective cover 101 attached to the bar terminal 105 as a conductive member, and FIG. 8B is a perspective view showing a contracted state of the protective cover 101. It is. The protective cover 101 of the second embodiment includes a first tubular member 101A and a second tubular member 101B arranged in series along the length direction of the distribution line 200, a first and a second tubular member 101A, The first and second tubular members 101 A and 101 B are slidable with respect to each other via the elastic member 104. In the present embodiment, the elastic member includes a spring, and in the illustrated example, particularly includes a coil spring 104. The protective cover 101 can elastically expand and contract in the length direction of the distribution line 200 by the action of the coil spring 104. However, the elastic member used in the present invention is not limited to the spring such as the coil spring 104, and other elastic members such as a bellows member may be used. For ease of understanding, in FIG. 8A and FIG. 8B, the portion of the distribution line 200 covered with the protective cover 101, the bar terminal 105, and the coil spring 104 are indicated by broken lines. FIGS. 9A and 9B are cutaway perspective views in which a part of the protective cover 101 is removed so that the inside of the protective cover 101 shown in FIGS. 8A and 8B is shown in detail. FIG. The protective cover 101 is normally in an extended state by a coil spring 104. The protective cover 101 can completely cover the bar terminal 105 in the extended state (FIGS. 8A and 9A), and at least a predetermined length of the bar portion of the bar terminal 105 in the contracted state. Insulation of distribution line 200 with adhesive tape or adhesive so that it can be exposed to the outside (the length necessary for connection to the instrument terminal) (FIGS. 8B and 9B) It is fixed to the sheath 200B.

図１０に、配電線２００の絶縁シース２００Ｂに固定される、伸長状態（通常状態）にある保護カバー１０１の長さ方向断面図を示す。上記したように、保護カバー１０１は、配電線２００の長さ方向に沿って直列に配置される第１の管状部材１０１Ａと第２の管状部材１０１Ｂ、及び第１及び第２管状部材１０１Ａ、１０１Ｂの間に配置される弾性部材としてのコイルばね１０４を備えている。第１管状部材１０１Ａは少なくとも棒端子１０５を受け入れ可能な内径を有しており、第１管状部材１０１Ａの一端は、第２管状部材１０１Ｂの内部に摺動可能に挿入される。第１管状部材１０１Ａにおける、第２管状部材１０１Ｂ側の端面は、第２管状部材１０１Ｂに収容されるコイルばね１０４の一端を支持する支持面１０６を形成する。第２管状部材１０１Ｂは、少なくとも第１管状部材１０１Ａ及びコイルばね１０４を受け入れ可能な内径を有する、大径部１０２を備えている。第２管状部材１０１Ｂはさらに、大径部１０２の内径よりも小さな内径を有する小径部１０３を備えており、これにより、大径部１０２と小径部１０３との間の第２管状部材１０１Ｂの内側表面は、保護カバー１０１の長さ方向に対して実質的に垂直に延びる環状面１０７を形成している。環状面１０７によって、コイルばね１０４の他端が支持される。しかし、小径部１０３はなくてもよい。その場合、第２管状部材１０１Ｂ（大径部１０２）における、第１管状部材１０１Ａと反対側の端部が、実質的に保護カバー１０１の内側へ屈曲され、環状面１０７を形成する。 FIG. 10 shows a longitudinal sectional view of the protective cover 101 in the extended state (normal state) fixed to the insulating sheath 200 B of the distribution line 200. As described above, the protective cover 101 includes the first tubular member 101A and the second tubular member 101B that are arranged in series along the length direction of the distribution line 200, and the first and second tubular members 101A and 101B. The coil spring 104 is provided as an elastic member disposed between the two. The first tubular member 101A has an inner diameter capable of receiving at least the rod terminal 105, and one end of the first tubular member 101A is slidably inserted into the second tubular member 101B. The end surface of the first tubular member 101A on the second tubular member 101B side forms a support surface 106 that supports one end of the coil spring 104 accommodated in the second tubular member 101B. The second tubular member 101B includes a large-diameter portion 102 having an inner diameter capable of receiving at least the first tubular member 101A and the coil spring 104. The second tubular member 101B further includes a small-diameter portion 103 having an inner diameter smaller than the inner diameter of the large-diameter portion 102, whereby the inner side of the second tubular member 101B between the large-diameter portion 102 and the small-diameter portion 103 is provided. The surface forms an annular surface 107 that extends substantially perpendicular to the length direction of the protective cover 101. The other end of the coil spring 104 is supported by the annular surface 107. However, the small diameter portion 103 may not be provided. In that case, the end of the second tubular member 101B (large diameter portion 102) opposite to the first tubular member 101A is substantially bent to the inside of the protective cover 101 to form an annular surface 107.

尚、保護カバー１０１が収縮状態から伸長状態に変化する際に第１管状部材１０１Ａが第２管状部材１０１Ｂから外れることを防ぐように、第１管状部材１０１Ａと第２管状部材１０１Ｂの間には、抜け止め用のストッパー構造を設けてもよい。また、第１管状部材１０１Ａの支持面１０６がコイルばね１０４に接着等により固定されていてもよい。 In order to prevent the first tubular member 101A from being detached from the second tubular member 101B when the protective cover 101 changes from the contracted state to the extended state, the protective cover 101 is interposed between the first tubular member 101A and the second tubular member 101B. Further, a stopper structure for preventing the removal may be provided. Further, the support surface 106 of the first tubular member 101A may be fixed to the coil spring 104 by adhesion or the like.

次に、図１１乃至図１３を参照して、第二実施形態の保護カバー１０１の使用方法について具体的に説明する。図１１は、保護カバー１０１が取り付けられた配電線２００を電力量計の計器端子部１０に接続した状態を示す正面図である。図１１には、計器端子部１０から外された状態の配電線２００（１Ｓ）も示している。他の配電線２００（２Ｓ、３Ｓ、３Ｌ、２Ｌ、１Ｌ）は計器端子部１０に接続された状態にある。図１１に示されるように、計器端子部１０から外された状態の配電線２００（１Ｓ）の保護カバー１０１は、コイルばね１０４（図示省略）によって伸長状態にあり、配電線２００の棒端子１０５を完全に覆っている。計器端子部１０に接続された配電線２００（２Ｓ、３Ｓ、３Ｌ、２Ｌ、１Ｌ）は、電線挿入穴１１内にねじ１２により固定されており、保護カバー１０１は、コイルばね１０４（図示省略）が圧縮された状態にある。 Next, with reference to FIG. 11 thru | or FIG. 13, the usage method of the protective cover 101 of 2nd embodiment is demonstrated concretely. FIG. 11 is a front view showing a state in which the distribution line 200 to which the protective cover 101 is attached is connected to the meter terminal unit 10 of the watt-hour meter. FIG. 11 also shows the distribution line 200 (1S) in a state where it is removed from the instrument terminal portion 10. The other distribution lines 200 (2S, 3S, 3L, 2L, 1L) are in a state of being connected to the instrument terminal unit 10. As shown in FIG. 11, the protective cover 101 of the distribution line 200 (1 S) removed from the instrument terminal portion 10 is in an extended state by a coil spring 104 (not shown), and the rod terminal 105 of the distribution line 200. Is completely covered. A distribution line 200 (2S, 3S, 3L, 2L, 1L) connected to the instrument terminal unit 10 is fixed in the wire insertion hole 11 with a screw 12, and a protective cover 101 is a coil spring 104 (not shown). Is in a compressed state.

図１２（Ａ）（Ｂ）は、保護カバー１０１の使用方法を説明する図であり、計器端子部１０と保護カバー１０１が断面図で示されている。図１２（Ａ）は配電線２００が計器端子部１０から外されて、棒端子１０５が保護カバー１０１によって完全に保護された状態を示し（図１１の配電線１Ｓに対応）、図１２（Ｂ）は、配電線２００が、計器端子部１０に接続された状態を示す（図１１の配電線２Ｓ、３Ｓ、１Ｌ、２Ｌ、３Ｌに対応）。計器端子部１０に配電線２００を接続する際、図１２（Ａ）に示すように、伸長状態の保護カバー１０１が取り付けられた配電線２００が、計器端子部１０の電線挿入穴１１に接近させられる。棒端子１０５の棒部を完全に覆っている保護カバー１０１の第１管状部材１０１Ａは、計器端子部１０の電線挿入穴１１周囲の壁面に当接し、コイルばね１０４の圧縮によって、第２管状部材１０１Ｂ内に摺動し、第２管状部材１０１Ｂ内に受け入れられる。これにより保護カバー１０１は、配電線２００の長さ方向に収縮し、棒端子１０５の棒部のみが電線挿入穴１１に進入する。棒部が電線挿入穴１１に十分挿入されると、ねじ１２によって、棒端子１０５が電線挿入穴１１にねじ止めされる。こうして、保護カバー１０１は、収縮状態で計器端子部１０と配電線２００の間に保持される。 FIGS. 12A and 12B are diagrams for explaining a method of using the protective cover 101, in which the instrument terminal portion 10 and the protective cover 101 are shown in cross-sectional views. FIG. 12A shows a state in which the distribution line 200 is removed from the instrument terminal portion 10 and the bar terminal 105 is completely protected by the protective cover 101 (corresponding to the distribution line 1S in FIG. 11). ) Shows a state in which the distribution line 200 is connected to the instrument terminal unit 10 (corresponding to the distribution lines 2S, 3S, 1L, 2L, and 3L in FIG. 11). When connecting the distribution line 200 to the instrument terminal unit 10, as shown in FIG. 12A, the distribution line 200 with the extended protective cover 101 attached is brought close to the wire insertion hole 11 of the instrument terminal unit 10. It is done. The first tubular member 101A of the protective cover 101 that completely covers the rod portion of the rod terminal 105 abuts on the wall surface around the electric wire insertion hole 11 of the instrument terminal portion 10, and the second tubular member is compressed by the compression of the coil spring 104. Slides into 101B and is received within second tubular member 101B. As a result, the protective cover 101 contracts in the length direction of the distribution line 200 and only the bar portion of the bar terminal 105 enters the electric wire insertion hole 11. When the rod portion is sufficiently inserted into the electric wire insertion hole 11, the rod terminal 105 is screwed into the electric wire insertion hole 11 by the screw 12. Thus, the protective cover 101 is held between the instrument terminal unit 10 and the distribution line 200 in a contracted state.

配電線２００を計器端子部１０から外す場合は、ねじ１２を緩め、棒端子１０５の棒部を電線挿入穴１１から引き出す。この時、コイルばね１０４の弾性力によって、保護カバー１０１が自然に（換言すれば自動的に）伸長する。従って、棒部が電線挿入穴１１から引き出されると同時に、棒端子１０５の棒部の周囲は、再び、図１２（Ａ）に示されるように保護カバー１０１によって完全に覆われる。 When removing the distribution line 200 from the instrument terminal portion 10, the screw 12 is loosened and the rod portion of the rod terminal 105 is pulled out from the wire insertion hole 11. At this time, the protective cover 101 naturally extends (in other words, automatically) by the elastic force of the coil spring 104. Therefore, at the same time that the rod portion is pulled out from the electric wire insertion hole 11, the periphery of the rod portion of the rod terminal 105 is completely covered again by the protective cover 101 as shown in FIG.

尚、上記したように、第二実施形態の保護カバー１０１の小径部１０３は、なくてもよい。しかし、小径部１０３は、絶縁シース２００Ｂ上への固定用に粘着テープを貼り付けたり、または接着剤等を塗布するために用いることができるので、保護カバー１０１の絶縁シース２００Ｂへの固定を容易に行なうことを可能にする。 As described above, the small-diameter portion 103 of the protective cover 101 of the second embodiment may not be provided. However, since the small-diameter portion 103 can be used for attaching an adhesive tape for fixing onto the insulating sheath 200B or applying an adhesive or the like, it is easy to fix the protective cover 101 to the insulating sheath 200B. Makes it possible to do.

このように、第二実施形態の保護カバー１０１は、計器端子部１０に対する棒端子１０５等の導電性部材の抜き差しの動きに合わせて、自動的に伸縮させることができる。従って、作業者が絶縁キャップを着脱する等の手間が不要であり、また、計器交換等の作業中に棒端子１０５を外部に露出させることを確実に防止することができる。従って、異極同士を短絡させる虞なく、容易且つ確実に導電性部材を保護することができ、計器交換作業等を効率的に行なうことができる。尚、上記したように、第二実施形態では保護カバー１０１に覆われる導電性部材として棒端子１０５を示しているが、棒端子１０５を用いることなく、配電線２００の裸線部２００Ａを直接保護カバー１０１で覆うようにして用いることもできる。 As described above, the protective cover 101 of the second embodiment can be automatically expanded and contracted in accordance with the movement of the conductive member such as the bar terminal 105 with respect to the instrument terminal portion 10. Accordingly, it is unnecessary for the operator to attach and detach the insulating cap, and it is possible to reliably prevent the bar terminal 105 from being exposed to the outside during work such as instrument exchange. Therefore, it is possible to easily and reliably protect the conductive member without fear of short-circuiting the different poles, and it is possible to efficiently perform instrument exchange work and the like. As described above, in the second embodiment, the bar terminal 105 is shown as the conductive member covered by the protective cover 101, but the bare wire portion 200A of the distribution line 200 is directly protected without using the bar terminal 105. The cover 101 can be used.

図１３に第二実施形態の保護カバー１０１を用いた、無停電での計器交換作業の例を示す。この場合、棒端子１０５の棒部の長さが電線挿入穴１１の長さよりも大きくされており、保護カバー１０１は、大きな長さの棒部を完全に覆うように大きな長さを有している点を除いて、図１２に示すものと同様である。図１３（Ａ）は、計器交換作業の前後に配電線２００が計器端子部１０に接続された状態を示し、図１３（Ｂ）は、無停電での計器交換作業中に保護カバー１０１をさらに収縮させた状態を示す。図１３（Ａ）に示す接続状態では、保護カバー１０１は収縮状態にあり、且つ、電線挿入穴１１から突出する棒端子１０５の棒部の部分を覆っている。計器交換時は、図１３（Ｂ）に示すように、保護カバー１０１を、直接作業者の手によりまたは適当な工具を用いてさらに収縮させ、棒端子１０５の棒部における、電線挿入穴１１から突出する部分を外部に露出させる。露出させた棒部の部分に、同極の配電線同士を短絡させるためのバイパス装置３０を接続する。計器交換作業終了後、バイパス装置３０を外すと同時に保護カバー１０１は計器端子部１０に向けて伸長し、再び図１３（Ａ）の状態に戻る。 FIG. 13 shows an example of an instrument replacement operation without a power failure using the protective cover 101 of the second embodiment. In this case, the length of the bar portion of the bar terminal 105 is larger than the length of the electric wire insertion hole 11, and the protective cover 101 has a large length so as to completely cover the large length of the bar portion. Except for this point, it is the same as that shown in FIG. FIG. 13 (A) shows a state in which the distribution line 200 is connected to the instrument terminal section 10 before and after the instrument replacement work, and FIG. 13 (B) further shows the protective cover 101 during the instrument replacement work without an uninterruptible power. The contracted state is shown. In the connection state shown in FIG. 13A, the protective cover 101 is in a contracted state and covers the portion of the bar portion of the bar terminal 105 protruding from the wire insertion hole 11. When replacing the instrument, as shown in FIG. 13B, the protective cover 101 is further shrunk directly by the operator's hand or using an appropriate tool, and the wire is inserted from the wire insertion hole 11 in the bar portion of the bar terminal 105. Expose the protruding part to the outside. A bypass device 30 for short-circuiting the same-polarity distribution lines is connected to the exposed bar portion. After the instrument replacement work is completed, the protective cover 101 extends toward the instrument terminal section 10 at the same time as the bypass device 30 is removed, and the state returns to the state shown in FIG.

このように、第二実施形態の保護カバー１０１を用いることにより、煩雑なバイパス工事を行なうことなく無停電での計器交換作業を容易に行なうことができる。さらに、計器交換作業終了後も、保護カバー１０１が自動的に伸長することにより確実に導電性部材を保護することができるので、異極同士を短絡させる等の虞がない。 As described above, by using the protective cover 101 of the second embodiment, it is possible to easily perform an instrument replacement operation without a power failure without performing a complicated bypass construction. Further, even after the instrument replacement operation is completed, the conductive cover 101 can automatically be extended by automatically extending the protective cover 101, so there is no possibility of short-circuiting the different poles.

本発明は、計器に接続される導電性部材の保護部材として広く適用できる。 The present invention can be widely applied as a protective member for a conductive member connected to a meter.

１、１０１保護カバー
１Ａ、１Ｃ円筒端部
１Ｂ蛇腹形状部
１０１Ａ第１の管状部材
１０１Ｂ第２の管状部材
１０２大径部
１０３小径部
１０４弾性部材（コイルばね）
１０５棒端子
１０６支持面
１０７環状面
２、２００配電線
２Ａ裸線部
２Ｂ、２００Ｂ絶縁シース
３外側端部
４内側端部
１０計器端子部
１１電線挿入穴
１１Ａ大径部
１１Ｂテーパー部
１１Ｃ小径部
１２ねじ
３０バイパス装置 DESCRIPTION OF SYMBOLS 1,101 Protective cover 1A, 1C Cylindrical edge part 1B Bellows shape part 101A 1st tubular member 101B 2nd tubular member 102 Large diameter part 103 Small diameter part 104 Elastic member (coil spring)
105 Bar terminal 106 Support surface 107 Annular surface 2, 200 Distribution line 2A Bare wire part 2B, 200B Insulation sheath 3 Outer end part 4 Inner end part 10 Instrument terminal part 11 Electric wire insertion hole 11A Large diameter part 11B Taper part 11C Small diameter part 12 Screw 30 Bypass device

Claims

A protective cover that covers a conductive member connected to a meter, and is elastically extendable along the length direction of the conductive member.

The protective cover according to claim 1, wherein the protective cover has a bellows shape.

The protective cover according to claim 2, wherein the protective cover has a spirally wound form, whereby the protective cover can be expanded and contracted along a circumferential direction of the protective cover. .

The protective cover is arranged between a first tubular member and a second tubular member arranged in series along the length direction of the conductive member, and an elastic member arranged between the first and second tubular members. The protective cover according to claim 1, further comprising: a member, wherein the first and second tubular members are slidable relative to each other via the elastic member.

The protective cover according to claim 4, wherein the elastic member includes a spring.

The protective cover according to any one of claims 1 to 5, wherein the conductive member includes a distribution line, and the protective cover covers the distribution line.

The protective cover according to claim 6, wherein the conductive member further includes a bar terminal, and the protective cover covers the bar terminal.