JP3951161B2

JP3951161B2 - Protective cover for live parts of magnetic contactor

Info

Publication number: JP3951161B2
Application number: JP14443999A
Authority: JP
Inventors: 広亙有吉; 正光日向
Original assignee: Fuji Electric FA Components and Systems Co Ltd
Current assignee: Fuji Electric FA Components and Systems Co Ltd
Priority date: 1999-05-25
Filing date: 1999-05-25
Publication date: 2007-08-01
Anticipated expiration: 2019-05-25
Also published as: JP2000340081A

Description

【０００１】
【発明の属する技術分野】
この発明は、電磁接触器の充電部を覆い、充電部への接触事故を防止する樹脂成形品の充電部保護カバーに関する。
【０００２】
【従来の技術】
上記充電部保護カバー（以下、単に保護カバーという。）として、従前から充電部を前方から覆う平板状のものが知られている。しかし、平板状の保護カバーは充電部の側方が開放していて保護作用が十分ではないため、充電部を側方からも覆うように箱状に形成した保護カバーが提案されている（特開平６−３６６６３号公報参照）。
【０００３】
【発明が解決しようとする課題】
充電部を側方からも覆うようにした保護カバーは、平板状のものに比べて保護作用の面で優れているが、そのような箱形の保護カバーは成形するのに大型の樹脂成形機を必要とし、特に大型の電磁接触器には容易に対応できないという問題があった。
そこで、この発明の課題は、充電部を側方からも覆うようにした箱形の保護カバーの成形を容易にすることにある。
【０００４】
【課題を解決するための手段】
上記課題を解決するために、この発明は、樹脂成形品からなり、電磁接触器の充電部を前方側から覆う前部板と、前記充電部を側方側から覆う側板とを有する電磁接触器の充電部保護カバーにおいて、前記充電保護カバーを前記前部板と前記側板とに分離して構成し、前記前部板を、前記電磁接触器の主端子の充電部を前面側から覆うカバー板と、このカバー板の両側にこれと一体に直角に形成された１対の側壁とで構成し、かつ前記側壁に前記側板を差し込んで結合するための結合部を設け、前記側板をこの側壁の結合部に差し込んで前記前部板に結合し、この前記前部板に結合した側板により前記電磁接触器の側面に設けられた補助端子の充電部を側面から覆うようにするものとする（請求項１）。この請求項１によれば、保護カバーの前部板と側板とが分離して構成されるので、成形金型が小型化され、それに伴って小型の成形機での成形が可能になる。
【０００５】
請求項１において、前記前部板を電磁接触器の電源側と負荷側の２つに分けて構成し、これら各部分を互いに突き合わせて電磁接触器に装着するようにすれば成形が一層容易となる（請求項２）。２つに分けた前記前部板の各部分は電源側及び負荷側の端子ねじとこれにねじ合わせた絶縁物の袋ナットとにより固定するようにすれば、別途に固定手段を設ける必要がなくなる（請求項３）。
【０００６】
【発明の実施の形態】
図１はこの発明の実施の形態を示す分解斜視図である。図１において、取り付け姿勢で示した３相電磁接触器１の上下部には、各相の電源側主端子２及び負荷側主端子３がそれぞれ配置され、また左右側面には補助端子４（図１では右側のみ見えている。）が配置されている。これら主端子２，３及び補助端子４並びにこれらに接続される図示しない配線の接続端部が充電部となる。主端子２，３にはそれぞれ端子ねじ５が設けられ、この端子ねじ５は各主端子２，３をその裏面側から図示しない穴を介して貫通し、ナット６により締め付けられている。
【０００７】
一方、７は樹脂成形品からなる電源側の保護カバーで、電磁接触器１の充電部を前方側（図１の左方側）から覆う前部板８と、充電部を側方側から覆う左右一対の側板９，９とに分離して構成されている。前部板８は電源側主端子２と対向するカバー板８ａの裏側に電源側主端子２の相間に位置する隔壁８ｂが一体形成され、また両側に隔壁８ｂと同じ高さの左右一対の側壁８ｃが一端が図１の下方に突き出るように門形状に一体形成されている。側壁８ｃの前後（図１の上下）端部には側板９が挿入される一対の溝８ｄが設けられ、またその中間に位置して低い円柱状の突起８ｅが設けられている。一方、側板９は方形の板体で、突起８ｅに対応して、これを嵌合させる円形の穴９ａが設けられている。
【０００８】
側板９は図示矢印方向に前部板８の溝８ｄに挿入され、突起８ｅに突き当たった段階で更に押し込まれることにより弾性変形して突起８ｅを乗り越える。次いで突起８ｅが穴９ａに落ち込み、この状態で側板８は前端面９ｂがカバー板８ａと同一面にとなり、かつ突起８ｅで抜け止めされて前部板８に結合される。前部板８に側板９，９が結合されて構成された保護カバー７は、図示矢印方向に電磁接触器１に組み合わされ、前部板８の左右側壁８ｃ，８ｃで電磁接触器１を挟み、側板９，９が補助端子４に被さるとともに、前部板８が主端子２に対向する。
【０００９】
そこで、中央相の端子ねじ５と対面するように前部板８にあけられた円形の穴８ｆを通して、絶縁物の袋ナット１０をねじ込み、保護カバー７を固定する。この固定部分において、図２に示すように、前部板８の内側には穴８ｆを囲んで円筒ボス８ｇが形成されていて、前部板８は円筒ボス８ｇが端子ねじ５の締付ナット６に突き当てられ、端子ねじ５により締め付けられる。この状態で保護カバー７は、電源側の充電部（主端子２，補助端子４）を電磁接触器１の前方側及び側方側から覆う。
【００１０】
上記した保護カバー７は充電部を電源側から覆うものであるが、電磁接触器１には負荷側にも同一構成の保護カバーが図示保護カバー７と突き合わされて装着される。
【００１１】
図示実施の形態によれば、保護カバー７は前部板８と側板９，９とが分離して構成され、前部板８の側壁８ｃは側板９に比べて低い高さに抑えられるので、小型の成形機で成形が可能になるとともに、保護カバーは更に電源側と負荷側とに分離して構成されているので、成形が一層容易となっている。また、保護カバー７は、端子ねじ５を利用して固定されているので、フックなどの別途の固定手段が不要である。
【００１２】
図３はこの発明の異なる実施の形態を示すもので、この場合の保護カバー１１は電源側と負荷側とが一体に構成され、前部板１２の両側の溝１２ａ，１２ａに左右一対の側板１３，１３が挿入され、突起１２ｂと穴１３ａとの嵌合により抜け止めされて結合される。この保護カバー１１は前部板１２の窓穴１２ｃを介して電磁接触器１に組み合わされ、フック１２ｄと電磁接触器１の突起１ａとの係合により固定されて、主端子２や補助端子４などの充電部を覆う。
【００１３】
【発明の効果】
以上の通り、この発明によれば、箱形の保護カバーを前部板と側板とに分離した構成とすることにより成形型が小形化され、小型の成形機で容易に大型の保護カバーの成形が可能になる。例えば、定格通電容量 260Ａ以上の電磁接触器の箱形の保護カバーを製作するのに、一体成形の場合は 200トン以上の成形機を必要とするが、図１に示した実施の形態においては 150トン以下の成形機で成形可能になった。
【図面の簡単な説明】
【図１】この発明の実施の形態を示す充電部保護カバーの分解斜視図である。
【図２】図１における保護カバー固定部分の断面図である。
【図３】この発明の異なる実施の形態を示す充電部保護カバーの分解斜視図である。
【符号の説明】
１電磁接触器
２主端子
３主端子
４補助端子
５端子ねじ
７保護カバー
８前部板
９側板
１１保護カバー
１２前部板
１３側板[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a charging part protective cover for a resin molded product that covers a charging part of an electromagnetic contactor and prevents a contact accident to the charging part.
[0002]
[Prior art]
As the charging unit protective cover (hereinafter simply referred to as a protective cover), a flat plate that covers the charging unit from the front is known. However, since the flat protective cover is not sufficiently protected because the side of the charging unit is open, a protective cover formed in a box shape so as to cover the charging unit from the side is also proposed (special feature). (See Kaihei 6-36663).
[0003]
[Problems to be solved by the invention]
Protective covers that cover live parts also from the side are superior in terms of protection compared to flat ones, but such a box-shaped protective cover is a large resin molding machine for molding. In particular, there is a problem that it cannot be easily applied to a large-sized electromagnetic contactor.
Therefore, an object of the present invention is to facilitate the formation of a box-shaped protective cover that covers the charging part also from the side.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is an electromagnetic contactor comprising a front plate that is made of a resin molded product and covers a charging part of an electromagnetic contactor from the front side, and a side plate that covers the charging part from the side. In the charging part protective cover, the charging protection cover is configured to be separated into the front plate and the side plate, and the front plate covers the charging part of the main terminal of the electromagnetic contactor from the front side. And a pair of side walls formed integrally at right angles with the cover plate on both sides of the cover plate, and a coupling portion for inserting and coupling the side plate to the side wall is provided. insert the coupling portion coupled to the front plate, it is assumed that the charging of the auxiliary terminal provided by the side plate attached to the said front plate to the side of the electromagnetic contactor so as to cover the side surface (according Item 1). According to the first aspect, since the front plate and the side plate of the protective cover are separated from each other, the molding die is miniaturized, and accordingly, molding with a small molding machine becomes possible.
[0005]
In claim 1, the front plate is divided into two parts on the power source side and the load side of the magnetic contactor, and these parts are butted against each other and attached to the electromagnetic contactor, thereby making the molding easier. (Claim 2). If each part of the front plate divided into two is fixed by the terminal screw on the power source side and the load side and the cap nut of the insulator screwed to the terminal screw, it is not necessary to separately provide fixing means. (Claim 3).
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an exploded perspective view showing an embodiment of the present invention. In FIG. 1, a power-side main terminal 2 and a load-side main terminal 3 for each phase are respectively disposed on the upper and lower portions of the three-phase electromagnetic contactor 1 shown in the mounting posture, and auxiliary terminals 4 (see FIG. 1 is visible only on the right side). The main terminals 2 and 3 and the auxiliary terminal 4 and the connection ends of the wiring (not shown) connected to them serve as a charging unit. Each of the main terminals 2 and 3 is provided with a terminal screw 5. The terminal screw 5 passes through each main terminal 2 and 3 from the back side thereof through a hole (not shown) and is tightened by a nut 6.
[0007]
On the other hand, 7 is a protective cover on the power source side made of a resin molded product. The front plate 8 covers the charging part of the electromagnetic contactor 1 from the front side (left side in FIG. 1), and the charging part is covered from the side side. The left and right side plates 9 and 9 are separated from each other. The front plate 8 is integrally formed with a partition wall 8b positioned between the phases of the power supply side main terminal 2 on the back side of the cover plate 8a facing the power supply side main terminal 2, and a pair of left and right side walls having the same height as the partition wall 8b on both sides. 8c is integrally formed in a gate shape so that one end protrudes downward in FIG. A pair of grooves 8d into which the side plates 9 are inserted are provided at the front and rear (upper and lower) ends of the side wall 8c, and a low columnar protrusion 8e is provided between them. On the other hand, the side plate 9 is a rectangular plate, and is provided with a circular hole 9a for fitting the projection 8e.
[0008]
The side plate 9 is inserted into the groove 8d of the front plate 8 in the direction of the arrow shown in the figure, and is pushed further when it abuts against the projection 8e, thereby elastically deforming and overcoming the projection 8e. Next, the projection 8e falls into the hole 9a, and in this state, the side plate 8 has the front end surface 9b flush with the cover plate 8a, and is prevented from coming off by the projection 8e and coupled to the front plate 8. The protective cover 7 formed by connecting the side plates 9 and 9 to the front plate 8 is combined with the electromagnetic contactor 1 in the direction of the arrow in the figure, and sandwiches the electromagnetic contactor 1 between the left and right side walls 8c and 8c of the front plate 8. The side plates 9, 9 cover the auxiliary terminal 4, and the front plate 8 faces the main terminal 2.
[0009]
Therefore, the insulating cover nut 10 is screwed through the circular hole 8f formed in the front plate 8 so as to face the terminal screw 5 of the central phase, and the protective cover 7 is fixed. In this fixed portion, as shown in FIG. 2, a cylindrical boss 8 g is formed inside the front plate 8 so as to surround a hole 8 f, and the cylindrical boss 8 g of the front plate 8 is a fastening nut of the terminal screw 5. 6 and is tightened by the terminal screw 5. In this state, the protective cover 7 covers the charging part (main terminal 2, auxiliary terminal 4) on the power source side from the front side and the side side of the electromagnetic contactor 1.
[0010]
The above-described protective cover 7 covers the charging unit from the power supply side, but a protective cover having the same configuration is attached to the electromagnetic contactor 1 so as to face the protective cover 7 on the load side.
[0011]
According to the illustrated embodiment, the protective cover 7 is configured by separating the front plate 8 and the side plates 9 and 9, and the side wall 8 c of the front plate 8 is suppressed to a lower height than the side plate 9. Molding is possible with a small molding machine, and the protective cover is further divided into a power source side and a load side, so that molding is further facilitated. Further, since the protective cover 7 is fixed using the terminal screw 5, no separate fixing means such as a hook is required.
[0012]
FIG. 3 shows a different embodiment of the present invention. In this case, the protective cover 11 has a power source side and a load side integrally formed, and a pair of left and right side plates are formed in the grooves 12a and 12a on both sides of the front plate 12. 13 and 13 are inserted, and are prevented from being detached by the fitting of the projection 12b and the hole 13a and are coupled. The protective cover 11 is combined with the electromagnetic contactor 1 through the window hole 12 c of the front plate 12, and is fixed by the engagement between the hook 12 d and the protrusion 1 a of the electromagnetic contactor 1, and the main terminal 2 and the auxiliary terminal 4. Cover the live parts.
[0013]
【The invention's effect】
As described above, according to the present invention, the mold is downsized by separating the box-shaped protective cover into the front plate and the side plate, and a large protective cover can be easily formed with a small molding machine. Is possible. For example, to produce a box-shaped protective cover for an electromagnetic contactor with a rated current capacity of 260 A or more, a molding machine of 200 tons or more is required in the case of integral molding, but in the embodiment shown in FIG. Molding was possible with a molding machine of 150 tons or less.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a charging unit protective cover showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a protective cover fixing portion in FIG.
FIG. 3 is an exploded perspective view of a charging unit protective cover showing a different embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Magnetic contactor 2 Main terminal 3 Main terminal 4 Auxiliary terminal 5 Terminal screw 7 Protective cover 8 Front plate 9 Side plate 11 Protective cover 12 Front plate 13 Side plate

Claims

樹脂成形品からなり、電磁接触器の充電部を前方側から覆う前部板と、前記充電部を側方側から覆う側板とを有する電磁接触器の充電部保護カバーにおいて、
前記充電保護カバーを前記前部板と前記側板とに分離して構成し、前記前部板を、前記電磁接触器の主端子の充電部を前面側から覆うカバー板と、このカバー板の両側にこれと一体に直角に形成された１対の側壁とで構成し、かつ前記側壁に前記側板を差し込んで結合するための結合部を設け、前記側板をこの側壁の結合部に差し込んで前記前部板に結合し、この前記前部板に結合した側板により前記電磁接触器の側面に設けられた補助端子の充電部を側面から覆うようにしたことを特徴とする電磁接触器の充電部保護カバー。In a charging part protective cover of an electromagnetic contactor comprising a resin molded product and having a front plate that covers the charging part of the electromagnetic contactor from the front side and a side plate that covers the charging part from the side,
The charge protection cover is configured by separating the front plate and the side plate, the front plate covers a charging portion of the main terminal of the electromagnetic contactor from the front side, and both sides of the cover plate And a pair of side walls integrally formed at right angles to each other, and provided with a coupling portion for inserting and coupling the side plate to the side wall, and inserting the side plate into the coupling portion of the side wall to The charging part protection of the magnetic contactor characterized in that the charging part of the auxiliary terminal provided on the side surface of the electromagnetic contactor is covered from the side by the side plate connected to the front plate. cover.

前記前部板を電磁接触器の電源側と負荷側とに分けて構成し、これら各部分を互いに突き合わせて電磁接触器に装着するようにしたことを特徴とする請求項１記載の電磁接触器の充電部保護カバー。2. The electromagnetic contactor according to claim 1, wherein the front plate is divided into a power supply side and a load side of the electromagnetic contactor, and these parts are abutted with each other and attached to the electromagnetic contactor. Live part protective cover.

２つに分けた前記前部板の各部分を電源側及び負荷側の端子ねじとこれにねじ合わせた絶縁物の袋ナットとにより固定するようにしたことを特徴とする請求項２記載の電磁接触器の充電部保護カバー。3. The electromagnetic wave according to claim 2, wherein each portion of the front plate divided into two parts is fixed by a terminal screw on the power source side and a load side and an insulating cap nut screwed to the terminal screw. Protective cover for live parts of contactor.