JP4778377B2

JP4778377B2 - Circuit breaker

Info

Publication number: JP4778377B2
Application number: JP2006203943A
Authority: JP
Inventors: 初男水野; 宏文石黒; 薫橋本
Original assignee: Panasonic Electric Works Co Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 2006-07-26
Filing date: 2006-07-26
Publication date: 2011-09-21
Anticipated expiration: 2026-07-26
Also published as: JP2008034145A

Description

本発明は、回路遮断器に関するものである。 The present invention relates to a circuit breaker.

従来より、器体の幅寸法を１極分の大きさとし、器体の長手方向両側部に接続端子をそれぞれ配置するとともに、器体の長手方向中央部に、可動接点及び固定接点からなる接点部と、開閉操作を行うためのハンドルと、ハンドルの開閉操作に応じて接点部を開閉させる開閉機構部とを収納した回路遮断器が提供されている（例えば特許文献１参照）。
特開２００２−４２６２９号公報（段落番号［００２４］−［００３１］、及び、図１参照） Conventionally, the width of the container is one pole, the connection terminals are arranged on both sides in the longitudinal direction of the container, and the contact part comprising a movable contact and a fixed contact at the longitudinal center of the container. And a circuit breaker that houses a handle for performing an opening / closing operation and an opening / closing mechanism that opens and closes a contact portion in accordance with the opening / closing operation of the handle (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2002-42629 (see paragraph numbers [0024]-[0031] and FIG. 1)

上記文献の回路遮断器では、器体に対してハンドルの軸部を回動自在に軸支させてあり、軸部の周面に突設されたリンク支持部と、器体の内部に上下方向に沿って配置されたハンドルリンクとを連結軸を介して連結している。したがって、ハンドルの回動操作に応じて、ハンドルリンクが器体内部を上下に移動し、それによって開閉機構が可動接触子に設けた可動接点を固定接点と接離させるため、器体内部にハンドルリンクを上下方向に移動させるための空きスペースを確保する必要があり、そのために器体の上下方向寸法、すなわち高さ寸法が大きくなるという問題があった。 In the circuit breaker of the above document, the shaft portion of the handle is pivotally supported with respect to the body, and a link support portion projecting on the peripheral surface of the shaft portion and the vertical direction inside the body Are connected via a connecting shaft. Accordingly, the handle link moves up and down in the body in response to the turning operation of the handle, and the opening and closing mechanism moves the movable contact provided on the movable contact to and away from the fixed contact. It is necessary to secure an empty space for moving the link in the vertical direction, which causes a problem that the vertical dimension, that is, the height dimension of the container increases.

本発明は上記問題点に鑑みて為されたものであり、その目的とするところは、器体の高さ寸法を小さくすることで、小型化を図った回路遮断器を提供することにある。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a circuit breaker that is miniaturized by reducing the height of the container.

上記目的を達成するために、請求項１の発明は、横長の器体の内部に回動自在に支持された本体部、当該本体部の周方向に突設されて器体の短手方向一方側から器体外部に突出する操作部および本体部の他の部位から器体内部に向かって突設された突出部を有するハンドルと、第１及び第２の腕部が斜めに交差するように両腕部の一端側が互いに連結され、両腕部の連結部位が器体内部の長手方向一方側で回動自在に支持されるとともに、第１の腕部が器体内部の長手方向他方側に、第２の腕部が器体内部の短手方向他方側にそれぞれ延出し、第１の腕部の延出方向に沿って延び突出部に設けた連結軸が遊挿される長孔が第１の腕部に形成されたリンクと、固定接点と、固定接点とともに接点部を構成する可動接点を有し、第２の腕部に回動自在に支持され、操作部の操作に応じてリンクが回転すると可動接点を固定接点に接離させる可動接触子と、接点部の閉極状態で接点部に過電流が流れていない通常時は可動接点が固定接点から離れる方向の力を蓄積し、接点部に過電流が流れると通常時に蓄積した力を解放して可動接点が固定接点から離れる方向に可動接触子を駆動する強制開極機構部とを備え、長孔の延出方向に沿った両側縁のうち本体部の回転中心から遠い方の側縁には、接点部の閉極状態で連結軸が位置するオン位置よりも閉極状態で連結軸が位置するオフ位置に近い部位に、器体の短手方向他方側に凹む切欠部が形成されたことを特徴とする。 In order to achieve the above-mentioned object, the invention of claim 1 is characterized in that a main body part rotatably supported inside a horizontally long container body, and projecting in the circumferential direction of the main body part, A handle having an operation part projecting from the side to the outside of the body and a projecting part projecting from the other part of the main body part toward the inside of the body so that the first and second arm parts obliquely intersect One end sides of both arms are connected to each other, and a connecting portion of both arms is rotatably supported on one side in the longitudinal direction inside the body, and the first arm is located on the other side in the longitudinal direction inside the body. The second arm portion extends to the other side in the short direction inside the body, and the elongated hole into which the connecting shaft provided on the projecting portion extends along the extending direction of the first arm portion is first inserted. It has a link formed on the arm part, a fixed contact, and a movable contact that constitutes the contact part together with the fixed contact, and rotates to the second arm part When the link rotates according to the operation of the operation unit, the movable contact contacts the movable contact with the fixed contact, and when the contact is closed, no overcurrent flows through the contact. Forced opening mechanism that drives the movable contact in the direction that the movable contact moves away from the fixed contact by accumulating the force in the direction in which the contact moves away from the fixed contact, and releasing the accumulated force when the overcurrent flows through the contact The side edge farther from the center of rotation of the main body part of both side edges along the extending direction of the long hole is in a closed state than the on position where the connecting shaft is located in the closed state of the contact part. A notch portion that is recessed on the other side in the lateral direction of the body is formed in a portion close to the off position where the connecting shaft is located .

請求項１の発明によれば、ハンドルの操作部を操作して本体部を回転させると、突出部に設けた連結軸が、器体の長手方向他方側に延出する第１の腕部に設けた長孔内を移動することによって、器体の短手方向他方側に延出する第２の腕部が第１及び第２の連結部位を支点として回転し、リンクの回転に応じて第２の腕部に支持された可動接触子を移動させて、接点部を接離させている。したがって、操作部の操作に応じて本体部が回転した場合でも、器体の短手方向他方側に延出する第２の腕部自体が、器体の短手方向他方側に移動することはなく、器体の短手方向においてリンクを移動させるための空きスペースを設ける必要がないから、器体の短手方向寸法、つまり高さ寸法を小さくできるという効果がある。 According to the first aspect of the present invention, when the main body is rotated by operating the operating portion of the handle, the connecting shaft provided on the protruding portion is connected to the first arm portion extending to the other side in the longitudinal direction of the vessel body. By moving in the provided long hole, the second arm portion extending to the other side in the short direction of the container body rotates with the first and second connecting portions as fulcrums, and according to the rotation of the link The movable contact supported by the two arms is moved so as to contact and separate the contact. Therefore, even when the main body rotates in response to the operation of the operation unit, the second arm itself that extends to the other side in the short direction of the container moves to the other side in the short direction of the container. In addition, since it is not necessary to provide an empty space for moving the link in the short direction of the container, there is an effect that the short dimension of the container, that is, the height can be reduced.

さらに、長孔の延出方向に沿った側縁には、オン位置よりもオフ位置に近い部位に切欠部が形成されているので、ハンドルをオン操作する際に、本体部の回転に応じてリンクが回転する動作を、切欠部のない場合に比べて遅らせることができる。したがって、ハンドルの操作部がオン位置により近い位置で、可動接触子に設けた可動接点が固定接点に接触することになり、接点部の接圧が操作部にかかる位置をオン位置により近づけることで、ハンドルをオン操作しやすくできるという効果がある。 Furthermore, the side edge along the extending direction of the long hole is formed with a notch in a portion closer to the off position than the on position, so that when the handle is turned on, according to the rotation of the main body The operation of rotating the link can be delayed compared to the case where there is no notch. Therefore, when the operating part of the handle is closer to the ON position, the movable contact provided on the movable contactor comes into contact with the fixed contact, and the contact point pressure applied to the operating part is closer to the ON position. The steering wheel can be easily turned on.

以下に本発明の実施の形態を図１〜図１０に基づいて説明する。 Hereinafter, embodiments of the present invention will be described with reference to FIGS.

本実施形態の回路遮断器は、例えば分岐ブレーカとして主幹ブレーカとともに分電盤の内部に配設され、各分岐回路に過電流や短絡電流が流れた際に熱動釈放動作あるいは電磁釈放動作を行って、分岐回路を保護するものである。尚、以下の説明では便宜上図３（ａ）に示す向きにおいて上下左右の方向を規定し、図３（ｂ）中の下側を前側、上側を後側として説明を行うが、実際には例えば図３（ａ）中の左右方向が上下方向に沿うようにして分電盤の内部に配設される。 The circuit breaker of the present embodiment is disposed inside the distribution board as a branch breaker together with the main breaker, for example, and performs a thermal release operation or an electromagnetic release operation when an overcurrent or a short-circuit current flows through each branch circuit. Thus, the branch circuit is protected. In the following description, for the sake of convenience, the vertical and horizontal directions are defined in the direction shown in FIG. 3A, and the lower side in FIG. 3B will be described as the front side and the upper side as the rear side. It is arrange | positioned inside a distribution board so that the left-right direction in Fig.3 (a) may follow an up-down direction.

回路遮断器Ａの器体１は横長の直方体状であって、図３および図１０に示すように厚み方向（前後方向）において２分割された半割体であるボディ２とカバー３とを結合して構成される。そして、この器体１の内部に、可動接点４および固定接点５からなる接点部６と、ハンドル７の開閉操作に応じて接点部６を開閉させる開閉機構部８と、接点部６の閉極状態で接点部６に過電流が流れていない通常時は可動接点４が固定接点５から離れる方向の力を蓄積し、接点部６に過電流が流れると通常時に蓄積した力を解放して接点部６を強制的に開極させる強制開極機構部９とを備えている。 The device body 1 of the circuit breaker A has a horizontally long rectangular parallelepiped shape, and as shown in FIGS. 3 and 10, the body 2 and the cover 3 which are halves divided into two in the thickness direction (front-rear direction) are combined. Configured. In the body 1, a contact portion 6 including a movable contact 4 and a fixed contact 5, an opening / closing mechanism portion 8 for opening / closing the contact portion 6 in accordance with an opening / closing operation of the handle 7, and closing of the contact portion 6. When the overcurrent does not flow to the contact part 6 in the normal state, the movable contact 4 accumulates a force in the direction away from the fixed contact 5, and when the overcurrent flows to the contact part 6, the normal accumulated force is released to contact the contact part 6. And a forced opening mechanism portion 9 for forcibly opening the portion 6.

ボディ２およびカバー３は、例えばナイロン樹脂などの絶縁性の合成樹脂によって、上面側の中央部が上方に突出した一面開口の箱状に形成されており、ボディ２およびカバー３の開口縁部にはそれぞれ４組の組立孔２ａ，３ａが穿設されている。これにより、ボディ２およびカバー３を内面同士が対面するようにして組み合わせた上で、各組の組立孔２ａ，３ａにリベット１１を挿通すれば、ボディ２およびカバー３が固定されて器体１が構成されることになる。またボディ２およびカバー３の上面中央は左右両側に比べて上側に突出しており、この凸部の表面にハンドル７用の開口部１ａとなるコ字状の角溝２ｂ，３ｂと、表示部材５２用の開口窓１ｂとなるコ字状の角溝２ｅ，３ｅとが形成されている。さらにボディ２およびカバー３の右側面には、それぞれ電源側の電線やブスバーなどの配線部材が挿入される開口部となるコ字状の角溝（図１０ではボディ２の角溝２ｃのみ図示）が形成され、そしてボディ２およびカバー３の左側面には、それぞれ負荷側の電線やブスバーなどの配線部材が挿入される開口部となるコ字状の角溝２ｄ，３ｄが形成されている。また器体１の下部には、器体１の左右方向において移動自在にスライダ１２を取り付けてあり、分電盤内部に配設されたＤＩＮレールのような取付レール９０（図１参照）のフランジ部９１にスライダ１２を係止させることで、器体１が取付レール９０に取着されるようになっている。 The body 2 and the cover 3 are formed in a box shape with a single-side opening with the central portion on the upper surface side projecting upward by an insulating synthetic resin such as nylon resin, for example, at the opening edge of the body 2 and the cover 3. Each has four sets of assembly holes 2a and 3a. Thus, after the body 2 and the cover 3 are combined so that the inner surfaces face each other, and the rivets 11 are inserted into the assembly holes 2a and 3a of each set, the body 2 and the cover 3 are fixed and the body 1 Will be configured. The center of the upper surface of the body 2 and the cover 3 protrudes upward as compared with the left and right sides. U-shaped square grooves 2b and 3b serving as the opening 1a for the handle 7 and the display member 52 are formed on the surface of the convex portion. U-shaped square grooves 2e and 3e are formed as opening windows 1b. Further, on the right side surfaces of the body 2 and the cover 3, a U-shaped square groove serving as an opening into which a wiring member such as a power supply side electric wire or bus bar is inserted (FIG. 10 shows only the square groove 2c of the body 2). The left side surfaces of the body 2 and the cover 3 are formed with U-shaped square grooves 2d and 3d, which are openings into which wiring members such as load-side electric wires and bus bars are inserted, respectively. A slider 12 is attached to the lower part of the container body 1 so as to be movable in the left-right direction of the container body 1, and a flange of a mounting rail 90 (see FIG. 1) such as a DIN rail disposed inside the distribution board. By locking the slider 12 to the portion 91, the container 1 is attached to the mounting rail 90.

器体１の長手方向両側部には電源側端子部１３と負荷側端子部１４とがそれぞれ収納されている。電源側端子部１３は、板金を折曲げて断面四角状の筒状に形成されて成り上面にねじ孔１５ａを有する端子金具１５と、この端子金具１５のねじ孔１５ａに螺挿される引締めねじ１６と、電源側端子１７とを備えている。電源側端子１７は、前側から見た形状がコ字状に形成され、上側片に引締めねじ１６を挿通させる挿通孔１７ａが形成されるとともに、下側片が端子金具１５内に挿通される端子部１７ｂとなっている。また電源側端子１７は、上側片の先端から下方に延出し、中間部に固定接点５が固着された固定接点板１７ｃを備えており、固定接点板１７ｃの下側部には導電性のアーク走行板１８が接続されている。アーク走行板１８は、固定接点板１７ｃの下側部から、可動接点４の周辺に発生する磁界との相互作用によってアークに作用する電磁力の向き（左斜め下向き）に延出する幅細のアーク走行部１８ａと、アーク走行部１８ａの下側端から器体１の底面に沿って突出する矩形板状の主部１８ｂとを備えている。このアーク走行板１８によって、接点部６の開極時に発生するアークを器体１の下面方向に引き延ばすことができ、主部１８ｂの上側に配置される消弧グリッド１９によってアークが消弧されるようになっている。なお接点部６の前後両側には、接点部６の周辺に発生する磁界を高めるための鉄片２５が内ケース２６を介してそれぞれ配置されている。また消弧グリッド１９の前後には絶縁シート２７がそれぞれ配置されている。また消弧グリッド１９の上側では後述するコイル２９と支持板２３との間に絶縁シート２７が配置され、下側ではアーク走行板１８とボディ２およびカバー３の底面との間に絶縁シート２７が配置されている（図１参照）。 The power source side terminal portion 13 and the load side terminal portion 14 are accommodated in both sides in the longitudinal direction of the vessel body 1. The power supply side terminal portion 13 is formed by bending a sheet metal into a cylindrical shape having a square cross section, and has a terminal fitting 15 having a screw hole 15a on the upper surface, and a tightening screw 16 screwed into the screw hole 15a of the terminal fitting 15. And a power supply side terminal 17. The power source side terminal 17 is formed in a U shape when viewed from the front side, and has an insertion hole 17a through which the tightening screw 16 is inserted into the upper piece, and a terminal through which the lower piece is inserted into the terminal fitting 15 It is part 17b. Further, the power supply side terminal 17 includes a fixed contact plate 17c extending downward from the tip of the upper piece and having the fixed contact 5 fixed to an intermediate portion thereof, and a conductive arc is provided on the lower side of the fixed contact plate 17c. A travel plate 18 is connected. The arc traveling plate 18 has a narrow width extending from the lower side portion of the fixed contact plate 17c in the direction of the electromagnetic force acting on the arc (left obliquely downward) by the interaction with the magnetic field generated around the movable contact 4. An arc traveling portion 18a and a rectangular plate-shaped main portion 18b projecting along the bottom surface of the container 1 from the lower end of the arc traveling portion 18a are provided. The arc traveling plate 18 can extend the arc generated when the contact portion 6 is opened toward the lower surface of the container 1, and the arc is extinguished by the arc extinguishing grid 19 disposed on the upper side of the main portion 18 b. It is like that. Note that iron pieces 25 for increasing the magnetic field generated around the contact portion 6 are arranged on the front and rear sides of the contact portion 6 via the inner case 26, respectively. Insulating sheets 27 are arranged before and after the arc extinguishing grid 19, respectively. Further, an insulating sheet 27 is disposed between a coil 29 and a support plate 23 described later on the upper side of the arc extinguishing grid 19, and an insulating sheet 27 is disposed between the arc traveling plate 18 and the bottom surfaces of the body 2 and the cover 3 on the lower side. Is arranged (see FIG. 1).

負荷側端子部１４は、電源側端子部１３と同様に端子金具１５および引締めねじ１６を備えるとともに、負荷側端子２０を備えている。負荷側端子２０は前側から見た形状がコ字状に形成され、両側片を上方に向けた状態で中央片を端子金具１５の内部に挿入してある。また負荷側端子２０の右側片は、編組線のような可撓性を有する可撓電線２１を介して細長い板状のバイメタル２２の下側端（固定端）に電気的に接続されている。なおバイメタル２２の長手方向中間部は可撓電線３０を介してコイル２９の一端に接続され、さらにコイル２９の他端は可撓電線３１を介して可動接触子４７に電気的に接続されている。而して可動接触子４７の可動接点４と固定接点５とが閉極している状態では、電源側端子部１３−接点部６−可動接触子４７−コイル２９−バイメタル２２−負荷側端子部１４という経路で電流が流れる主電路が形成される。 The load side terminal portion 14 includes a terminal fitting 15 and a tightening screw 16 as well as the power source side terminal portion 13 and also includes a load side terminal 20. The load side terminal 20 is formed in a U shape when viewed from the front side, and a center piece is inserted into the terminal fitting 15 with both side pieces facing upward. Further, the right side piece of the load side terminal 20 is electrically connected to the lower end (fixed end) of the long and narrow bimetal 22 via a flexible electric wire 21 having flexibility such as a braided wire. The intermediate portion in the longitudinal direction of the bimetal 22 is connected to one end of the coil 29 through the flexible electric wire 30, and the other end of the coil 29 is electrically connected to the movable contact 47 through the flexible electric wire 31. . Thus, in a state where the movable contact 4 and the fixed contact 5 of the movable contact 47 are closed, the power supply side terminal portion 13 -the contact portion 6 -the movable contact 47 -the coil 29 -the bimetal 22 -the load side terminal portion. A main electric circuit through which a current flows through a path 14 is formed.

ここでボディ２およびカバー３の上面の開口縁部には、引締めねじ１６に対向する部位に工具挿通孔１ｃを構成する円弧状の溝が形成されている（図１及び図３参照）。引締めねじ１６は器体１の内部において上下方向への移動が規制されており、工具挿通孔１ｃを通して挿入されたドライバ（図示せず）によって引締めねじ１６を回転させると、ねじ孔１５ａに引締めねじ１６が螺挿した端子金具１５が上昇又は下降する。したがって、端子金具１５が上昇する方向に引締めねじ１６を回転させると、端子金具１５が上方に移動し、電源側端子１７の端子部１７ｂあるいは負荷側端子２０の中央片と端子金具１５の下側片１５ｂとの間に配線部材が圧接接続されるのである。 Here, an arc-shaped groove constituting the tool insertion hole 1c is formed in a portion facing the tightening screw 16 at the opening edge portion of the upper surface of the body 2 and the cover 3 (see FIGS. 1 and 3). The tightening screw 16 is restricted from moving in the vertical direction inside the body 1, and when the tightening screw 16 is rotated by a screwdriver (not shown) inserted through the tool insertion hole 1c, the tightening screw 16 is inserted into the screw hole 15a. The terminal fitting 15 into which 16 is screwed up is raised or lowered. Therefore, when the tightening screw 16 is rotated in the direction in which the terminal fitting 15 rises, the terminal fitting 15 moves upward, and the terminal portion 17b of the power supply side terminal 17 or the center piece of the load side terminal 20 and the lower side of the terminal fitting 15 A wiring member is press-connected between the piece 15b.

次にハンドル７および開閉機構部８について説明を行う。ハンドル７は、器体１の内部に器体１の厚み方向（前後方向）に沿って橋架されるハンドル軸４０を介して回動自在に支持される円柱状の本体部７ａと、本体部７ａの周方向に突設されて器体１の上面（短手方向一方側）から器体１の外部に突出するＴ字形の操作部７ｂと、本体部７ａの右下側の周面に器体１の内部に向かって突設された突出部７ｃとを一体に備え、捩りコイルばねよりなるハンドル復帰ばね４１によってオフ方向（図１中の左周り）に付勢されている。また器体１の外部に突出する操作部７ｂには操作摘み４２が取着されるようになっている。 Next, the handle 7 and the opening / closing mechanism 8 will be described. The handle 7 includes a cylindrical main body 7a that is rotatably supported via a handle shaft 40 that is bridged along the thickness direction (front-rear direction) of the main body 1 inside the main body 1, and a main body 7a. Projecting from the upper surface (one side in the short direction) of the container body 1 to the outside of the container body 1, and the container body on the lower right peripheral surface of the main body section 7a 1 is integrally provided with a projecting portion 7c projecting toward the inside of 1, and is biased in the off direction (leftward in FIG. 1) by a handle return spring 41 made of a torsion coil spring. In addition, an operation knob 42 is attached to the operation portion 7b protruding to the outside of the body 1.

開閉機構部８はリンク４４，４４、接触子ホルダ４６、接圧ばね４９、表示部材５２、付勢ばね５３等を主要な構成として備えている。リンク４４，４４は同一の形状に形成されており、第１の腕部４４ａと第２の腕部４４ｂとが斜めに交差するように一端側が互いに連結されて、Ｌ字状に形成されている。そして第１及び第２の腕部（以下、腕部と略称す。）４４ａ，４４ｂの連結部位が器体１の長手方向一方側（右側）で軸４５を介して器体１に回動自在に支持されており、腕部４４ａが器体１の長手方向他方側（左側）に、腕部４４ｂが器体１の短手方向他方側（下側）それぞれ延出している。またリンク４４の腕部４４ａには、腕部４４ａの延出方向に沿って延び、ハンドル７の突出部７ｃに枢着された連結軸４３が遊挿される長孔４４ｃが形成されている。なお長孔４４ｃの延出方向に沿った両側縁のうち本体部７ａの回転中心から遠い方の側縁（下側縁）には、接点部６の閉極状態（図６、図７参照）で連結軸４３が位置するオン位置よりも開極状態（図１、図２参照）で連結軸４３が位置するオフ位置に近い部位（右寄りの部位）に、器体１の短手方向他方側（下側）に凹む切欠部４４ｄを形成してある。また他方の腕部４４ｂには、接触子ホルダ４６および可動接触子４７をリンク４４，４４とを連結するための連結軸４８が挿通される丸孔４４ｅが形成されている。ここに器体１の長手方向とは、電源側端子部１３および負荷側端子部１４の配列方向である左右方向（図１の左右）を意味している。また器体１の短手方向とは、長手方向および厚み方向（幅方向）とそれぞれ直交する方向であり、長手方向を左右方向と見たときの上下方向（図１の上下）を意味している。 The opening / closing mechanism 8 includes links 44, 44, a contact holder 46, a contact pressure spring 49, a display member 52, an urging spring 53, and the like as main components. The links 44 and 44 are formed in the same shape, and one end side is mutually connected so that the 1st arm part 44a and the 2nd arm part 44b may cross | intersect diagonally, and it is formed in the L-shape. . And the connection part of the 1st and 2nd arm part (henceforth abbreviated as arm part) 44a, 44b is freely rotatable to the body 1 via the shaft 45 on one side (right side) in the longitudinal direction of the body 1. The arm portion 44a extends on the other side (left side) in the longitudinal direction of the body 1 and the arm portion 44b extends on the other side (lower side) in the lateral direction of the body 1 respectively. The arm portion 44a of the link 44 is formed with a long hole 44c extending along the extending direction of the arm portion 44a and into which the connecting shaft 43 pivotally attached to the protruding portion 7c of the handle 7 is loosely inserted. Of the side edges along the extending direction of the elongated hole 44c, the contact edge 6 is closed on the side edge (lower edge) far from the rotation center of the main body 7a (see FIGS. 6 and 7). The other side of the container 1 in the short direction is at a position closer to the off position where the connecting shaft 43 is located (right side) than the on position where the connecting shaft 43 is located (see FIGS. 1 and 2). A notch 44d that is recessed (lower side) is formed. The other arm portion 44b is formed with a round hole 44e through which a connecting shaft 48 for connecting the contact holder 46 and the movable contact 47 to the links 44, 44 is inserted. Here, the longitudinal direction of the container 1 means the left-right direction (the left-right direction in FIG. 1) that is the arrangement direction of the power-side terminal portion 13 and the load-side terminal portion 14. Moreover, the short direction of the container 1 is a direction orthogonal to the longitudinal direction and the thickness direction (width direction), and means the up and down direction (up and down in FIG. 1) when the longitudinal direction is viewed as the left and right direction. Yes.

可動接触子４７は器体１の前後方向に２分割された半割体４７ａ，４７ｂからなり、両半割体４７ａ，４７ｂは前後方向の中間面に対して対称な形状に形成されている。各半割体４７ａ，４７ｂの上下方向中間部には、連結軸４８が挿通される軸孔４７ｃが貫設されており、その下側端には可動接点４が一体に形成されている。一方、可動接触子４７の上側端には、左側に向かって突出片４７ｄが延出しており、突出片４７ｄの上側縁には、右斜め上方に湾曲しながら突出する乗り上げ部４７ｅが形成されている。また両半割体４７ａ，４７ｂは、軸孔４７ｃの形成部位よりも下側が互いに離れる向きに湾曲しており、両半割体４７ａ，４７ｂを重ねた際にこの湾曲部分にできる空間に後述の係合ピン３６が挿通されるようになっている。 The movable contact 47 is composed of halves 47a and 47b that are divided into two in the front-rear direction of the vessel body 1, and both halves 47a, 47b are formed in a symmetrical shape with respect to the intermediate surface in the front-rear direction. A shaft hole 47c through which the connecting shaft 48 is inserted is penetrated in the middle portion in the vertical direction of each half body 47a, 47b, and the movable contact 4 is integrally formed at the lower end thereof. On the other hand, a protruding piece 47d extends toward the left side at the upper end of the movable contact 47, and a riding-up portion 47e that protrudes while being bent obliquely upward to the right is formed at the upper edge of the protruding piece 47d. Yes. Both halves 47a and 47b are curved in a direction in which the lower sides of the shaft hole 47c are separated from each other. When the halves 47a and 47b are overlapped with each other, a space that can be formed into the curved portions will be described later. The engaging pin 36 is inserted.

接触子ホルダ４６は、後述するラッチ部材５４の右側端が挿通される挿通孔４６ｂを有する中央片４６ａと、この中央片４６ａの前後方向における両側縁から右方向にそれぞれ突出する側片４６ｃとでコ字状に形成されており、各側片４６ｃには連結軸４８を挿通する挿通孔４６ｄが貫設されている。接点部６に接圧を与える接圧ばね４９は一対の捩りコイルばねの一端側が互いに連結された形状に形成されており、連結部分を接触子ホルダ４６の中央片４６ａに当接させるとともに、各捩りコイルばねの他端側を可動接触子４７に係止させている。また器体１には、接点部６が閉極している状態で側片４６ｃによって撓められて、可動接点４が固定接点５から離れる方向の復帰力を接触子ホルダ４６に付与する開極ばね５１が取着されている。 The contact holder 46 includes a central piece 46a having an insertion hole 46b through which a right end of a latch member 54, which will be described later, is inserted, and side pieces 46c that protrude rightward from both side edges in the front-rear direction of the central piece 46a. Each side piece 46c is formed with an insertion hole 46d through which the connecting shaft 48 is inserted. The contact pressure spring 49 that applies contact pressure to the contact portion 6 is formed in a shape in which one end sides of a pair of torsion coil springs are connected to each other. The contact portion abuts against the central piece 46a of the contact holder 46, and The other end side of the torsion coil spring is locked to the movable contact 47. Further, the body 1 is bent by the side piece 46 c in a state where the contact portion 6 is closed, and the opening that gives the contact holder 46 a restoring force in the direction in which the movable contact 4 separates from the fixed contact 5. A spring 51 is attached.

また表示部材５２は接点部６のオン／オフ状態を表示するためのもので、図２に示すように軸４５を介してリンク４４とともに回転自在に支持される円筒状の主部５２ａと、主部５２ａの上面側に設けられた表示部５２ｂと、主部５２ａの右側部（器体１の長手方向他方側の部位）から突出し、先端側が下向きに湾曲した弧状の当接部５２ｃとを備えている。表示部５２ｂは左右方向の中央部において上側への突出量が最も高くなっており、中央部から両側部にかけて斜め下向きにそれぞれ傾斜する２つの表示面５２ｄ，５２ｅを備えている。ここで、左側の表示面５２ｄはオフ表示用、右側の表示面５２ｅはオン表示用の表示面であり、各々の表示面５２ｄ，５２ｅの色や文字などでオン／オフの状態が判別できるようになっており、器体１の開口窓１ｂから何れかの表示面が露出することで現在の接点状態を判別することができる。なお表示部材５２は捩りコイルばねからなる復帰ばね５３によってオフ表示方向（図２中の右回り）に付勢されている。 The display member 52 is for displaying the on / off state of the contact portion 6, and as shown in FIG. 2, a cylindrical main portion 52a rotatably supported with the link 44 via the shaft 45, A display part 52b provided on the upper surface side of the part 52a, and an arcuate contact part 52c that protrudes from the right side of the main part 52a (the part on the other side in the longitudinal direction of the body 1) and has a distal end curved downward. ing. The display portion 52b has the highest amount of protrusion upward at the center in the left-right direction, and includes two display surfaces 52d and 52e that are inclined obliquely downward from the center to both sides. Here, the left display surface 52d is for off display, and the right display surface 52e is for on display, so that the on / off state can be discriminated by the colors, characters, etc. of the respective display surfaces 52d and 52e. The present contact state can be determined by exposing any display surface from the opening window 1b of the container 1. The display member 52 is urged in the OFF display direction (clockwise in FIG. 2) by a return spring 53 made of a torsion coil spring.

而して開閉機構部８は、接触子ホルダ４６の両側片４６ｃの間に、可動接触子４７と、円筒状のスペーサ５０と、一対の捩りコイルばねの一端側を互いに連結した形状に形成された接圧ばね４９と、一対のリンク４４，４４とを配置し、各側片４６ｃの挿通孔４６ｄと、スペーサ５０の中心孔と、接圧ばね４９のコイル部分の中心孔と、可動接触子４７の軸孔４７ｃと、リンク４４の丸孔４４ｅとに連結軸４８を挿通することによって、接触子ホルダ４６に対してリンク４４および可動接触子４７が所定の角度範囲で回転自在に枢着される。このように、接触子ホルダ４６にリンク４４と可動接触子４７とを保持させた状態で、リンク４４の中央部を軸４５により器体１に回動自在に枢支させ、さらにリンク４４の長孔４４ｃとハンドル７の突出部７ｃに設けた挿通孔とに連結軸４３を挿通することで、ハンドル７と接触子ホルダ４６とがリンク４４を介して連結されるのである。なお接圧ばね４９は、一対の捩りコイルばねを連結する部位が接触子ホルダ４６の中央片４６ａに当接するとともに、捩りコイルばねの他端側が可動接触子４７の中央部に係止しており、可動接触子４７が連結軸４８を中心に右回りに回転すると、可動接触子４７を左回りに回転させる方向のばね復帰力を可動接触子４７に付与するようになっている。 Thus, the opening / closing mechanism 8 is formed in a shape in which the movable contact 47, the cylindrical spacer 50, and one end sides of the pair of torsion coil springs are connected to each other between the side pieces 46c of the contact holder 46. The contact pressure spring 49 and the pair of links 44, 44 are disposed, the insertion hole 46d of each side piece 46c, the center hole of the spacer 50, the center hole of the coil portion of the contact pressure spring 49, and the movable contactor By inserting the connecting shaft 48 through the shaft hole 47c of the 47 and the round hole 44e of the link 44, the link 44 and the movable contact 47 are pivotally attached to the contact holder 46 so as to be rotatable within a predetermined angle range. The In this manner, with the contact holder 46 holding the link 44 and the movable contact 47, the central portion of the link 44 is pivotally supported on the container body 1 by the shaft 45, and the length of the link 44 is further increased. The handle 7 and the contact holder 46 are connected via the link 44 by inserting the connecting shaft 43 through the hole 44 c and the insertion hole provided in the protrusion 7 c of the handle 7. In the contact pressure spring 49, a portion connecting the pair of torsion coil springs abuts on the central piece 46a of the contact holder 46, and the other end side of the torsion coil spring is locked to the center portion of the movable contact 47. When the movable contact 47 rotates clockwise around the connecting shaft 48, a spring return force in a direction to rotate the movable contact 47 counterclockwise is applied to the movable contact 47.

次に強制開極機構部９について説明する。強制開極機構部９はバイメタル２２、電磁石装置２８、ラッチ部材５４、引き外し部材５５などを主要な構成として備え、接点部６に定格電流以上の過電流が流れた際に接点部６を強制開極させる熱動釈放機能と、熱動釈放機能が作動する電流値に比べて遙かに大きい短絡電流のような大電流が接点部６に流れた際に接点部６を強制開極させる電磁釈放機能とを備えている。 Next, the forced opening mechanism unit 9 will be described. The forcible opening mechanism unit 9 includes a bimetal 22, an electromagnet device 28, a latch member 54, a tripping member 55, and the like as main components, and forces the contact unit 6 when an overcurrent exceeding the rated current flows through the contact unit 6. The thermal release function that opens the contacts and the electromagnetic force that forcibly opens the contact parts 6 when a large current such as a short-circuit current that is much larger than the current value at which the thermal release function operates flows. It has a release function.

バイメタル２２の下側端は、板金の左右方向の両側縁が上側に折曲されたコ字状の支持板２３の左側片に固着されている。支持板２３の右側片には、消弧グリッド１９の上側に横片が載置される導電性のＬ字形のアーク走行板２４の縦片が連結されており、支持板２３の中央片とアーク走行板２４の横片とは隙間をあけて並行に配置されている。支持板２３の左側片の上縁からは幅細の突出片２３ａが上方に突出しており、この突出片２３ａに対向して調整ねじ５７が配設される。調整ねじ５７は、器体１の内面に設けた溝内に嵌め込んだ保持片５８のねじ孔に螺合し、その先端が突出片２３ａと対向している。したがって、調整ねじ５７のねじ込み量を調整して、調整ねじ５７の先端で突出片２３ａを押圧することによって、突出片２３ａを左右方向に撓ませて、バイメタル２２の上側端（自由端）の位置を左右方向に移動させることができ、バイメタル２２が湾曲して強制開極機構部９がトリップ動作を行う時の電流値を調整することができる。 The lower end of the bimetal 22 is fixed to a left side piece of a U-shaped support plate 23 in which both side edges in the left-right direction of the sheet metal are bent upward. The right piece of the support plate 23 is connected to a vertical piece of a conductive L-shaped arc traveling plate 24 on which a horizontal piece is placed above the arc extinguishing grid 19. It arrange | positions in parallel with the horizontal piece of the traveling plate 24 with the clearance gap. A narrow protruding piece 23a protrudes upward from the upper edge of the left piece of the support plate 23, and an adjusting screw 57 is disposed opposite to the protruding piece 23a. The adjusting screw 57 is screwed into a screw hole of a holding piece 58 fitted in a groove provided on the inner surface of the container 1, and the tip thereof faces the protruding piece 23 a. Therefore, by adjusting the screwing amount of the adjusting screw 57 and pressing the protruding piece 23a with the tip of the adjusting screw 57, the protruding piece 23a is bent in the left-right direction, and the position of the upper end (free end) of the bimetal 22 Can be moved in the left-right direction, and the current value when the bimetal 22 is bent and the forced opening mechanism portion 9 performs a trip operation can be adjusted.

また支持板２３の中央片には電磁石装置２８が載置されている。電磁石装置２８は、一端が可撓電線３０を介してバイメタル２２の自由端に接続されるとともに他端が可撓電線３１を介して可動接触子４７に電気的に接続されたコイル２９と、コイル２９が巻装される円筒状のコイル枠３２と、コイル枠３２の内部に軸方向において移動自在に配置される可動鉄心３３と、コイル枠３２の一端側（引き外し部材５５側）の開口部に取着される固定鉄心３４と、可動鉄心３３の一面（固定鉄心３４側の面）に取着される樹脂製のスペーサ３８と、可動鉄心３３と固定鉄心３４との間に介装されて可動鉄心３３を固定鉄心３４から離れる向きに押圧するコイルばね３５と、可動鉄心３３の他面（固定鉄心３４と反対側の面）に取着されてコイル枠３２の右側の開口部から外部に突出する係合ピン３６と、固定鉄心３４を軸方向に貫通する挿通孔３４ａに移動自在に挿通される駆動ピン３７と、左右方向の両側縁が下向きに折曲されてコイル２９の左右両側および上側を覆うヨーク３９とを備えている。ヨーク３９には右側片から中央片にかけてスリット３９ａが形成されており、このスリット３９ａを通して係合ピン３６が右方向に突出している。またヨーク３９の中央片の下側には板状のばね部材６１が配置されており、ばね部材６１の一部を切り起こして形成された弾性ばね片６１ａがスリット３９ａを通して上方に突出している。コイル２９に通電すると、固定鉄心３４−ヨーク３９−可動鉄心３３を通る磁路の磁気抵抗を小さくするように、可動鉄心３３に対して固定鉄心３４との間で吸引力が発生する。そして主電路に短絡電流のような大電流が流れた場合には、復帰ばね３５のばね力に抗して可動鉄心３３が固定鉄心３４に近づく向きに移動し、可動鉄心３３に押された駆動ピン３７が引き外し部材５５の突出片２３ａを左向きに押圧して、引き外し部材５５を軸５９を中心として右回りに回転させることにより、ラッチ部材５４の係合を解除するとともに、可動鉄心３３に取着された係合ピン３６の大径部３６ａが可動接触子４７と当接して、可動接触子４７を連結軸４８を中心として右回りに回転させる。 An electromagnet device 28 is placed on the central piece of the support plate 23. The electromagnet device 28 includes a coil 29 having one end connected to the free end of the bimetal 22 via the flexible electric wire 30 and the other end electrically connected to the movable contact 47 via the flexible electric wire 31. 29, a cylindrical coil frame 32 around which the coil 29 is wound, a movable iron core 33 that is movably disposed in the axial direction inside the coil frame 32, and an opening on one end side (the tripping member 55 side) of the coil frame 32. The fixed iron core 34 attached to the inner surface of the movable iron core 33, the resin spacer 38 attached to one surface of the movable iron core 33 (the surface on the side of the fixed iron core 34), and the movable iron core 33 and the fixed iron core 34 are interposed. A coil spring 35 that presses the movable iron core 33 in a direction away from the fixed iron core 34 and the other surface of the movable iron core 33 (a surface opposite to the fixed iron core 34) are attached to the outside from the opening on the right side of the coil frame 32. Projecting engagement pin 36 and fixed iron 34, a drive pin 37 that is movably inserted into an insertion hole 34a that penetrates the shaft 34 in the axial direction, and a yoke 39 that is bent downward on both side edges in the left-right direction and covers the left and right sides and the upper side of the coil 29. . A slit 39a is formed in the yoke 39 from the right piece to the center piece, and the engagement pin 36 protrudes rightward through the slit 39a. A plate-like spring member 61 is disposed below the central piece of the yoke 39, and an elastic spring piece 61a formed by cutting and raising a part of the spring member 61 protrudes upward through the slit 39a. When the coil 29 is energized, an attractive force is generated between the movable iron core 33 and the fixed iron core 34 so as to reduce the magnetic resistance of the magnetic path passing through the fixed iron core 34 -the yoke 39 -the movable iron core 33. When a large current such as a short-circuit current flows in the main circuit, the movable iron core 33 moves toward the fixed iron core 34 against the spring force of the return spring 35 and is driven by the movable iron core 33. The pin 37 presses the protruding piece 23a of the tripping member 55 to the left and rotates the tripping member 55 clockwise about the shaft 59, thereby releasing the engagement of the latch member 54 and moving the movable core 33. The large-diameter portion 36a of the engaging pin 36 attached to the abutment contacts the movable contact 47, and rotates the movable contact 47 clockwise about the connecting shaft 48.

ラッチ部材５４は鉄製（ＳＰＣＣ）の部品であって細長い棒状に形成されており、長手方向の中間部が軸５６を介して器体１に回動自在に軸支されている。またラッチ部材５４の上側縁には、長手方向の一端側（右側）には接触子ホルダ４６と係合する凹溝５４ａが形成されており、この凹溝５４ａよりも中央寄りの部位には上側に突出する突起部５４ｂが形成されている。一方、ラッチ部材５４の長手方向他端側（左側）には、引き外し部材５５と係止する係止突起５４ｃが突設されている。 The latch member 54 is an iron (SPCC) part and is formed in a long and narrow bar shape, and an intermediate portion in the longitudinal direction is pivotally supported on the container body 1 via a shaft 56. Further, a concave groove 54a that engages with the contact holder 46 is formed on the upper edge of the latch member 54 on one end side (right side) in the longitudinal direction. A protruding portion 54b is formed so as to protrude from the surface. On the other hand, a latching projection 54 c that latches with the tripping member 55 is provided on the other end side (left side) in the longitudinal direction of the latch member 54.

引き外し部材５５は、軸５９を介して器体１に回動自在に軸支される本体部５５ａと、この本体部５５ａから下方に突出し先端部が駆動ピン３７に対向配置される延出片５５ｂとを有し、本体部５５ａの下側縁には、ラッチ部材５４の係止突起５４ｃと係止する係止部５５ｃが設けられている。引き外し部材５５は復帰ばね６０によって軸５９を中心に左回りに付勢されており、係止部５５ｃをラッチ部材５４の係止突起５４ｃと係止させることによって、接点部６を開極させる方向の勢力を蓄積した状態でラッチ部材５４をラッチしている。 The tripping member 55 includes a main body portion 55a that is pivotally supported on the container body 1 via a shaft 59, and an extending piece that protrudes downward from the main body portion 55a and has a distal end portion opposed to the drive pin 37. 55b, and a locking portion 55c that locks with the locking projection 54c of the latch member 54 is provided on the lower edge of the main body 55a. The tripping member 55 is biased counterclockwise about the shaft 59 by the return spring 60, and the contact portion 6 is opened by locking the locking portion 55c with the locking projection 54c of the latch member 54. The latch member 54 is latched in a state where the directional force is accumulated.

次に回路遮断器の動作について図１〜図９を参照して説明する。図１〜図３は接点部６の開極状態（オフ状態）を示しており、ハンドル７は、操作部７ｂが開口部１ａの左端に当接するまで、ハンドル復帰ばね４１のばね力を受けて図中左回りに回動している。またハンドル７とリンク４４とを連結する連結軸４３は、腕部４４ａに設けた長孔４４ｃ内の右端（オフ位置）まで移動し、リンク４４の回転に応じて腕部４４ｂに回転自在に軸支された可動接触子４７が図中左側に移動して、可動接触子４７の可動接点４が固定接点５から開離している。すなわち電源側端子部１３と負荷側端子部１４とは非導通状態（オフ状態）となっている。またオフ状態では、可動接触子４７の上端側に設けた乗り上げ部４７ｅが、表示部材５２に設けた当接部５２ｃの基部付近と当接しており、表示部材５２は復帰ばね５３のばね力によって図中右回りに回転しているので、器体１の開口窓１ｂから左側の表示面５２ｄが露出し、オフ状態を表示している。 Next, the operation of the circuit breaker will be described with reference to FIGS. 1 to 3 show the open state (off state) of the contact portion 6, and the handle 7 receives the spring force of the handle return spring 41 until the operation portion 7b contacts the left end of the opening 1a. It rotates counterclockwise in the figure. Further, the connecting shaft 43 that connects the handle 7 and the link 44 moves to the right end (off position) in the elongated hole 44c provided in the arm portion 44a, and rotates freely on the arm portion 44b according to the rotation of the link 44. The supported movable contact 47 moves to the left in the figure, and the movable contact 4 of the movable contact 47 is separated from the fixed contact 5. That is, the power supply side terminal portion 13 and the load side terminal portion 14 are in a non-conductive state (off state). In the off state, the riding-up portion 47 e provided on the upper end side of the movable contact 47 is in contact with the vicinity of the base of the contact portion 52 c provided on the display member 52, and the display member 52 is caused by the spring force of the return spring 53. Since it rotates clockwise in the figure, the display surface 52d on the left side is exposed from the opening window 1b of the container 1, and the OFF state is displayed.

このオフ状態から、操作摘み４２を操作してハンドル復帰ばね４１のばね力に抗してハンドル７を図中右回りに回転させると、ハンドル７の突出部７ｃに設けた連結軸４３が長孔４４ｃ内を左方向へ移動し、連結軸４３によって長孔４４ｃの下側縁が下向きに押圧されるので、リンク４４が軸４５を中心に左回りに回転し、リンク４４の回転に伴って可動接触子４７が図中右側へ移動する。そして、図３及び図４に示すようにハンドル７の操作部７ｂがオフ位置とオン位置との略中間位置まで移動すると、可動接点４が固定接点５に接触する位置まで可動接触子４７が移動する。ここでハンドル７を図１及び図２に示すオフ位置から図３及び図４に示す位置まで回転させる間は、可動接点４が固定接点５に接触しておらず、接圧ばね４９による接圧が発生していないので、ハンドル７を小さい力で操作することができる。 From this OFF state, when the operation knob 42 is operated to rotate the handle 7 clockwise in the figure against the spring force of the handle return spring 41, the connecting shaft 43 provided on the protruding portion 7c of the handle 7 becomes a long hole. 44c moves to the left, and the lower edge of the long hole 44c is pressed downward by the connecting shaft 43, so the link 44 rotates counterclockwise around the shaft 45 and is movable as the link 44 rotates. The contact 47 moves to the right side in the figure. 3 and 4, when the operation portion 7b of the handle 7 moves to a substantially intermediate position between the off position and the on position, the movable contact 47 moves to a position where the movable contact 4 contacts the fixed contact 5. To do. Here, while the handle 7 is rotated from the off position shown in FIGS. 1 and 2 to the position shown in FIGS. 3 and 4, the movable contact 4 is not in contact with the fixed contact 5, and the contact pressure by the contact pressure spring 49. Therefore, the handle 7 can be operated with a small force.

その後、図６及び図７に示すようにハンドル復帰ばね４１および接圧ばね４９のばね力に抗して操作摘み４２を図中右側に押し、操作部７ｂが開口部１ａの右端に当接するまでハンドル７を図中右回りに回転させると、連結軸４３が長孔４４ｃ内の左端（オン位置）まで移動し、連結軸４３の移動に応じてリンク４４が図中右回りに回転するので、リンク４４の腕部４４ｂに支持された接触子ホルダ４６が図中右側へ移動する。この間、可動接触子４７の一端側に設けた可動接点４は固定接点５と接触しているので、可動接触子４７は連結軸４８を中心として図中右回りに回転し、それに応じて接圧ばね４９が撓められるので、接圧ばね４９のばね復帰力によって可動接点４が固定接点５に押圧される。すなわち接圧ばね４９により接点部６に接圧が与えられる。この状態では電源側端子部１３と負荷側端子部１４とは導通状態（オン状態）となっている。またハンドル７を図４及び図５に示す接点部６の接触開始位置から図７及び図８に示すオン位置まで回転させると、可動接触子４７の上端側に設けた乗り上げ部４７ｅが、表示部材５２に設けた当接部５２ｃの下側湾曲面に摺接しながら図中右側に移動するので、主部５２ａが復帰ばね５３の付勢力に抗して図中左回りに回転する。そして上記オン位置では当接部５２ｃの下側端が乗り上げ部４７ｅの頂上部に乗り上げた状態となり、オン表示用の表示面５２ｅが開口窓１ｂに臨む位置に移動するので、表示面５２ｅにより接点部６のオン状態を容易に把握できる。なおハンドル７をオン位置まで回転させると、ハンドル７とリンク４４とを連結する連結軸４３が、ハンドル軸４０と軸４８とを結ぶ線分を超えて反対側（図６中の左側）に移動するので、開極ばね５１などのばね力がハンドル７をオン方向に付勢する方向に作用し、ハンドル７がオン位置に保持される。 Thereafter, as shown in FIGS. 6 and 7, the operation knob 42 is pushed rightward in the drawing against the spring force of the handle return spring 41 and the contact pressure spring 49 until the operation portion 7b comes into contact with the right end of the opening 1a. When the handle 7 is rotated clockwise in the drawing, the connecting shaft 43 moves to the left end (on position) in the long hole 44c, and the link 44 rotates clockwise in the drawing according to the movement of the connecting shaft 43. The contact holder 46 supported by the arm portion 44b of the link 44 moves to the right side in the figure. During this time, the movable contact 4 provided on one end side of the movable contact 47 is in contact with the fixed contact 5, so that the movable contact 47 rotates clockwise in the figure around the connecting shaft 48, and the contact pressure is accordingly increased. Since the spring 49 is bent, the movable contact 4 is pressed against the fixed contact 5 by the spring return force of the contact pressure spring 49. That is, contact pressure is applied to the contact portion 6 by the contact pressure spring 49. In this state, the power supply side terminal portion 13 and the load side terminal portion 14 are in a conductive state (ON state). Further, when the handle 7 is rotated from the contact start position of the contact portion 6 shown in FIGS. 4 and 5 to the on position shown in FIGS. 7 and 8, the ride-up portion 47e provided on the upper end side of the movable contact 47 is used as a display member. 52, the main part 52a rotates counterclockwise in the figure against the urging force of the return spring 53. As shown in FIG. In the ON position, the lower end of the contact portion 52c is in a state of riding on the top of the riding portion 47e, and the display surface 52e for ON display moves to a position facing the opening window 1b. The ON state of the part 6 can be easily grasped. When the handle 7 is rotated to the on position, the connecting shaft 43 that connects the handle 7 and the link 44 moves to the opposite side (left side in FIG. 6) beyond the line connecting the handle shaft 40 and the shaft 48. Therefore, a spring force such as the opening spring 51 acts in a direction to urge the handle 7 in the ON direction, and the handle 7 is held in the ON position.

また図６及び図７に示すオン状態から、操作摘み４２を操作してハンドル７をオフ方向（図中左回り）に回転させると、ハンドル７の突出部７ｃに設けた連結軸４３が長孔４４ｃ内を右側に移動し、リンク４４が図中右回りに回転するので、リンク４４とともに接触子ホルダ４６に支持された可動接触子４７が図中左側に移動し、可動接点４が固定接点５から開離する。そして、ハンドル７とリンク４４とを連結する連結軸４３が、ハンドル軸４０と軸４８とを結ぶ線分を超えて反対側（図１中の右側）に移動すると、ハンドル復帰ばね４１のばね力を受けてハンドル７がオフ方向に急速に回転し、図１及び図２に示すオフ状態となり、ハンドル７がオフ位置に保持される。またこの時、可動接触子４７の乗り上げ部４７ｅは、当接部５２ｃの下側傾斜面に摺接しながら図中左側に移動するので、表示部材５２が復帰ばね５３の復帰力を受けて図中右回りに回転し、図１及び図２に示すオフ位置ではオフ表示用の表示面５２ｄが開口窓１ｂから露出する。 When the operation knob 42 is operated from the on state shown in FIGS. 6 and 7 to rotate the handle 7 in the off direction (counterclockwise in the figure), the connecting shaft 43 provided on the protruding portion 7c of the handle 7 becomes a long hole. 44c moves to the right in the figure, and the link 44 rotates clockwise in the figure. Therefore, the movable contact 47 supported by the contact holder 46 together with the link 44 moves to the left in the figure, and the movable contact 4 is fixed to the fixed contact 5. Break away from. When the connecting shaft 43 that connects the handle 7 and the link 44 moves to the opposite side (the right side in FIG. 1) beyond the line connecting the handle shaft 40 and the shaft 48, the spring force of the handle return spring 41 is reached. In response to this, the handle 7 rapidly rotates in the off direction, and the off state shown in FIGS. 1 and 2 is established, and the handle 7 is held in the off position. At this time, the riding-up portion 47e of the movable contactor 47 moves to the left side in the figure while being in sliding contact with the lower inclined surface of the contact portion 52c, so that the display member 52 receives the return force of the return spring 53 in the drawing. The display surface 52d for off display is exposed from the opening window 1b at the off position shown in FIGS. 1 and 2 by rotating clockwise.

上述のようにハンドル７の操作部７ｂ（操作摘み４２）を操作して本体部７ａを回転させると、突出部７ｃに枢支された連結軸４３が、器体１の長手方向他方側に延出する第１の腕部４４ａに設けた長孔４４ｃ内を移動することによって、器体１の短手方向他方側に延出する第２の腕部４４ｂが両腕部４４ａ，４４ｂの連結部位（すなわち軸４５）を支点として回転し、リンク４４の回転に応じて腕部４４ｂに支持された可動接触子４７を移動させて、接点部６を接離させている。したがって、操作部７ｂの操作に応じて本体部７ａが回転した場合でも、器体１の短手方向他方側に延出する腕部４４ｂ自体が、器体１の短手方向他方側に移動することはなく、器体１の短手方向においてリンク４４を移動させるための空きスペースを設ける必要がないから、器体１の短手方向寸法、つまり高さ寸法を小さくできる。 As described above, when the operation portion 7b (operation knob 42) of the handle 7 is operated to rotate the main body portion 7a, the connecting shaft 43 pivotally supported by the protruding portion 7c extends to the other side in the longitudinal direction of the body 1. The second arm portion 44b extending to the other side in the short direction of the body 1 is moved through the long hole 44c provided in the first arm portion 44a to be extended, and the connecting portion of both arm portions 44a and 44b. (That is, the shaft 45 is rotated as a fulcrum, and the movable contact 47 supported by the arm portion 44b is moved in accordance with the rotation of the link 44, and the contact portion 6 is brought into contact with and separated from. Therefore, even when the main body portion 7a rotates in accordance with the operation of the operation portion 7b, the arm portion 44b itself extending to the other side in the short direction of the container body 1 moves to the other side in the short direction of the device body 1. In other words, it is not necessary to provide an empty space for moving the link 44 in the short direction of the container 1, so that the short dimension, that is, the height dimension of the container 1 can be reduced.

また長孔４４ｃの延出方向に沿った側縁（下側縁）には、オン状態で連結軸４８が存在するオン位置よりも、オフ状態で連結軸４８が存在するオフ位置に近い部位に下側に凹む切欠部４４ｄが形成されているので、ハンドル７をオン操作する際に、本体部７ａの回転に応じてリンク４４が回転する動作を、切欠部４４ｄが形成されていない場合に比べて遅らせることができる。したがって、ハンドル７の操作部７ｂ（操作摘み４２）がオン位置により近い位置で、可動接触子４７に設けた可動接点４が固定接点５に接触し始めることになり、接点部６の接圧が操作部７ｂ（操作摘み４２）にかかる位置をオン位置により近づけることで、ハンドル７をオン操作しやすくしてある。 The side edge (lower edge) along the extending direction of the elongated hole 44c is closer to the off position where the connecting shaft 48 exists in the off state than the on position where the connecting shaft 48 exists in the on state. Since the notched portion 44d that is recessed downward is formed, when the handle 7 is turned on, the operation of rotating the link 44 according to the rotation of the main body portion 7a is compared with the case where the notched portion 44d is not formed. Can be delayed. Therefore, the movable contact 4 provided on the movable contact 47 starts to come into contact with the fixed contact 5 when the operation portion 7b (operation knob 42) of the handle 7 is closer to the ON position, and the contact pressure of the contact portion 6 is reduced. The handle 7 is easily turned on by bringing the position of the operation portion 7b (operation knob 42) closer to the on position.

次に接点部６に異常電流が流れた場合の強制開極機構部９の動作について説明する。図６及び図７に示すオン状態で短絡事故が発生するなどして接点部６に短絡電流のような大電流が流れた場合、コイル２９に大電流が流れ、可動鉄心３３と固定鉄心３４との間に発生する磁気吸引力によって、可動鉄心３３が復帰ばね３５のばね力に抗して固定鉄心３４に近づく向きに移動する（図８及び図９参照）。この時、可動鉄心３３に押された駆動ピン３７が、固定鉄心３４の挿通孔３４ａを通して左側に突出し、引き外し部材５５の突出片２３ａを左向きに押圧するので、引き外し部材５５を軸５９を中心に図中右回りに回転させることによって、引き外し部材５５とラッチ部材５４との係合状態が解除される。引き外し部材５５とラッチ部材５４との係合が外れると、ラッチ部材５４が弾性ばね片２９ａのばね力を受け、軸５６を中心に右回りに回転し、ラッチ部材５４の凹溝５４ａと接触子ホルダ４６の中央片４６ａとの係合が外れるので、接圧ばね４９や開極ばね５１のばね力を受けて接触子ホルダ４６が連結軸４８を中心に右回りに回転するとともに、可動接触子４７が図中右回りに回転し、可動接点４が固定接点５から開離する。また可動鉄心３３とともに係合ピン３６が図中左側に移動し、係合ピン３６の大径部３６ａによって可動接触子４７の下端側が左側に押圧されるので、可動接点４を固定接点５から短時間で引き外して、接点溶着の発生を防止することができる。なお図８および図９は強制開極機構部９が電磁釈放動作を行って接点部６を強制開極した直後の状態を示しており、その後ハンドル復帰ばね４１や復帰ばね６０などのばね力を受けて開閉機構部８および強制開極機構部９は図１および図２に示すオフ状態に復帰するので、復旧後にハンドル７をオン操作することによって、接点部６を再び閉極させることができる。 Next, the operation of the forced opening mechanism 9 when an abnormal current flows through the contact 6 will be described. When a large current such as a short circuit current flows through the contact portion 6 due to a short circuit accident in the ON state shown in FIGS. 6 and 7, a large current flows through the coil 29, and the movable iron core 33 and the fixed iron core 34. The movable iron core 33 moves in a direction approaching the fixed iron core 34 against the spring force of the return spring 35 (see FIGS. 8 and 9). At this time, the drive pin 37 pushed by the movable iron core 33 protrudes to the left side through the insertion hole 34a of the fixed iron core 34 and presses the protruding piece 23a of the releasing member 55 leftward. By rotating clockwise in the figure in the center, the engagement state between the tripping member 55 and the latch member 54 is released. When the engagement between the tripping member 55 and the latch member 54 is released, the latch member 54 receives the spring force of the elastic spring piece 29a, rotates clockwise about the shaft 56, and contacts the concave groove 54a of the latch member 54. Since the engagement with the center piece 46a of the child holder 46 is disengaged, the contact holder 46 rotates clockwise around the connecting shaft 48 in response to the spring force of the contact pressure spring 49 or the opening spring 51, and movable contact is also possible. The child 47 rotates clockwise in the figure, and the movable contact 4 is separated from the fixed contact 5. In addition, the engaging pin 36 moves to the left in the drawing together with the movable iron core 33, and the lower end side of the movable contact 47 is pressed to the left by the large diameter portion 36a of the engaging pin 36. It is possible to prevent the occurrence of contact welding by tripping over time. 8 and 9 show a state immediately after the forcible opening mechanism portion 9 performs electromagnetic release operation and forcibly opens the contact portion 6, and then the spring force of the handle return spring 41, the return spring 60, etc. is applied. In response, the opening / closing mechanism 8 and the forced opening mechanism 9 return to the OFF state shown in FIGS. 1 and 2, so that the contact 6 can be closed again by turning on the handle 7 after recovery. .

また図６及び図７に示すオン状態で接点部６に定格電流を超える過電流（熱動釈放機能の作動電流）が流れた場合、バイメタル２２が湾曲して、バイメタル２２の上端側で引き外し部材５５の上部が右側に押圧されるので、引き外し部材５５が軸５９を中心として右回りに回転し、引き外し部材５５とラッチ部材５４との係合が解除される。この時、ラッチ部材５４が弾性ばね片２９ａのばね力を受け、軸５６を中心に右回りに回転し、ラッチ部材５４の凹溝５４ａと接触子ホルダ４６の中央片４６ａとの係合が外れるので、接圧ばね４９や開極ばね５１のばね力を受けて接触子ホルダ４６が連結軸４８を中心に右回りに回転するとともに、可動接触子４７が図中右回りに回転し、可動接点４が固定接点５から開離する。なお強制開極機構部９が熱動釈放動作を行って接点部６を強制開極した場合でも、上述と同様にハンドル復帰ばね４１や復帰ばね６０などのばね力を受けて開閉機構部８および強制開極機構部９は図１および図２に示すオフ状態に復帰するので、復旧後にハンドル７をオン操作することによって、接点部６を再び閉極させることができる。 6 and FIG. 7, when an overcurrent exceeding the rated current flows in the contact portion 6 in the ON state (the operation current of the thermal release function), the bimetal 22 is bent and tripped on the upper end side of the bimetal 22. Since the upper portion of the member 55 is pressed rightward, the tripping member 55 rotates clockwise about the shaft 59, and the engagement between the tripping member 55 and the latch member 54 is released. At this time, the latch member 54 receives the spring force of the elastic spring piece 29a, rotates clockwise around the shaft 56, and the engagement between the concave groove 54a of the latch member 54 and the central piece 46a of the contact holder 46 is released. Therefore, the contact holder 46 is rotated clockwise around the connecting shaft 48 in response to the spring force of the contact pressure spring 49 and the opening spring 51, and the movable contact 47 is rotated clockwise in the figure, thereby moving the movable contact. 4 is released from the fixed contact 5. Even when the forcible opening mechanism 9 performs the thermal release operation and forcibly opens the contact 6, the opening / closing mechanism 8 and the receiving mechanism 41 receive the spring force of the handle return spring 41 and the return spring 60 in the same manner as described above. Since the forced opening mechanism portion 9 returns to the off state shown in FIGS. 1 and 2, the contact portion 6 can be closed again by turning on the handle 7 after recovery.

なお、本発明の精神と範囲に反することなしに、広範に異なる実施形態を構成することができることは明白なので、この発明は、特定の実施形態に制約されるものではない。 It should be noted that a wide variety of different embodiments can be configured without departing from the spirit and scope of the present invention, and the present invention is not limited to a specific embodiment.

本実施形態の回路遮断器のオフ状態を示し、カバーを外した状態の側面図である。It is a side view of the state which showed the OFF state of the circuit breaker of this embodiment, and removed the cover. 同上のオフ状態を示し、カバーおよびリンクを外した状態の側面図である。It is a side view of the state which showed the off state same as the above and removed the cover and the link. 同上のオフ状態を示し、（ａ）は側面図、（ｂ）は上面図である。The off state is shown, wherein (a) is a side view and (b) is a top view. 同上のオフからオンに切り替わる途中の状態を示し、カバーを外した状態の側面図である。It is the side view of the state which showed the state in the middle of switching from OFF to ON same as the above, and removed the cover. 同上のオフからオンに切り替わる途中の状態を示し、カバーおよびリンクを外した状態の側面図である。It is the side view of the state which shows the state in the middle of switching from OFF to ON same as the above, and removed the cover and the link. 同上のオン状態を示し、カバーを外した状態の側面図である。It is a side view of the state which showed the ON state same as the above and removed the cover. 同上のオン状態を示し、カバーおよびリンクを外した状態の側面図である。It is a side view of the state which showed the ON state same as the above and which removed the cover and the link. 同上のトリップ状態を示し、カバーを外した状態の側面図である。It is a side view of the state which showed the trip state same as the above and removed the cover. 同上のトリップ状態を示し、カバーおよびリンクを外した状態の側面図である。It is a side view of the state which showed the trip state same as the above and which removed the cover and the link. 同上の分解斜視図である。It is an exploded perspective view same as the above.

Explanation of symbols

１器体
４可動接点
５固定接点
６接点部
７ハンドル
７ａ本体部
７ｂ操作部
７ｃ突出部
９強制開極機構部
４４リンク
４４ａ第１の腕部
４４ｂ第２の腕部
４４ｃ長孔
４７可動接触子
４８連結軸 DESCRIPTION OF SYMBOLS 1 Container 4 Movable contact 5 Fixed contact 6 Contact part 7 Handle 7a Main body part 7b Operation part 7c Projection part 9 Forced opening mechanism part 44 Link 44a 1st arm part 44b 2nd arm part 44c Long hole 47 Movable contactor 48 connecting shaft

Claims

A main body part rotatably supported inside a horizontally long body, an operation part that protrudes in the circumferential direction of the main body part and protrudes from the one side in the short direction of the body to the outside of the body part, and A handle having a protrusion projecting from the other part toward the inside of the body,
One end sides of both arm portions are connected to each other so that the first and second arm portions cross each other diagonally, and a connecting portion of both arm portions is rotatably supported on one side in the longitudinal direction inside the body, The first arm portion extends to the other side in the longitudinal direction inside the body, the second arm portion extends to the other side in the short side inside the device body, and extends along the extending direction of the first arm portion. A link in which a long hole into which the connecting shaft provided in the protruding portion is loosely inserted is formed in the first arm portion;
A fixed contact;
A movable contact having a movable contact that constitutes a contact portion together with the fixed contact, is rotatably supported by the second arm portion, and contacts and separates the movable contact when the link rotates according to the operation of the operation portion When,
When the contact part is closed and overcurrent does not flow to the contact part, the movable contact accumulates a force in the direction away from the fixed contact, and when the overcurrent flows to the contact part, the normal accumulated force is released. And a forcible opening mechanism that drives the movable contact in a direction in which the movable contact moves away from the fixed contact ,
Of both side edges along the extending direction of the long hole, the side edge farther from the rotation center of the main body is connected to the connecting shaft in the open state than the on position where the connecting shaft is located in the closed state of the contact part. A circuit breaker characterized in that a notch portion that is recessed on the other side in the short direction of the body is formed in a portion close to the off position where is located .