JP2009212063A

JP2009212063A - Circuit breaker

Info

Publication number: JP2009212063A
Application number: JP2008056793A
Authority: JP
Inventors: Hatsuo Mizuno; 初男水野
Original assignee: Panasonic Electric Works Co Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 2008-03-06
Filing date: 2008-03-06
Publication date: 2009-09-17
Anticipated expiration: 2028-03-06
Also published as: WO2009110347A1; CN101978458A; JP4769263B2; CN101978458B

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit breaker in which a present state can be grasped surely by a single display member whether it is in an ON state, or an OFF state or a tripped state. <P>SOLUTION: Inside a unit body, there are housed a contact point portion 6 composed of a fixed contact portion 7 and a movable contact point 8, an handle 10 supported rotatably against the unit body in a condition that a handling knob 10a is exposed out of the unit body, a link mechanism 9 for switching on and off the contact point 6 in accordance with a handle operation, a trip mechanism which drives the link mechanism 9 and opens an electrode forcibly when an abnormal current flowing in an electric passage is detected, and a display member 15 which has a display portion for displaying an ON state of the contact point portion 6, a display portion for displaying an OFF state and a display portion for displaying a tripping state and which is connected with the link mechanism 9. The link mechanism 9 moves either of the display portions of the ON display portion and the OFF display portion and the trip display portion to a position of a display window provided on a surface of the unit body in accordance with an ON movement, an OFF movement and a trip movement. <P>COPYRIGHT: (C)2009,JPO&INPIT

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、ハンドル操作に応じて可動接点を固定接点に接触又は開離させるリンク機構と、開極方向の力を蓄積した状態でリンク機構をラッチし、過電流発生時に電磁釈放装置或いは熱動釈放装置に一端部が押されることでラッチ状態を解除してリンク機構によるトリップ動作を行わせるトリップレバーとを備えた回路遮断器が提供されている（例えば特許文献１参照）。 Conventionally, a link mechanism that contacts or separates a movable contact with a fixed contact in response to a handle operation, and latches the link mechanism in a state where force in the opening direction is accumulated, and an electromagnetic release device or a thermal release device when an overcurrent occurs There is provided a circuit breaker provided with a trip lever that releases a latched state by one end being pushed to perform a trip operation by a link mechanism (see, for example, Patent Document 1).

上記特許文献に示される回路遮断器では、トリップ動作中を示す文字などが表示された表示部を具備したトリップ表示部材を備え、トリップ動作時には、器体に設けた開口窓から外部に臨む位置に表示部を移動させるとともに、オン状態およびオフ状態では表示部が開口窓から外部の臨まないような位置に表示部を移動させており、トリップ表示部材の表示部によりトリップ動作中か否かを判別できるようになっていた。
特開２００７−２５７９６０号公報 The circuit breaker disclosed in the above-mentioned patent document includes a trip display member having a display unit displaying characters indicating that the trip operation is being performed. At the time of trip operation, the circuit breaker is located at a position facing the outside from the opening window provided in the vessel body. While moving the display unit, the display unit is moved to a position where the display unit does not face the outside from the opening window in the on state and off state, and it is determined whether the trip operation is being performed by the display unit of the trip display member I was able to do it.
JP 2007-257960 A

上述の回路遮断器では、トリップ表示部材でトリップ動作中か否かを表示しているだけなので、オン状態かオフ状態かを判別するためには、トリップ表示部材とは別にハンドルの位置を確認しなければならなかった。すなわち、オン状態かオフ状態かトリップ状態かの区別をするためには、トリップ表示部材とハンドル位置の両方を見て判断する必要があり、誤判断をする可能性があった。 In the above circuit breaker, the trip display member only indicates whether or not the trip operation is in progress. Therefore, in order to determine whether it is on or off, check the position of the handle separately from the trip display member. I had to. That is, in order to distinguish between the on state, the off state, and the trip state, it is necessary to make a judgment by looking at both the trip display member and the handle position, and there is a possibility of making an erroneous judgment.

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、１つの表示部材だけでオン状態、オフ状態、トリップ状態の何れの状態であるかを表示することによって現在の状態を確実に把握できるようにし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-mentioned problems, and the object of the present invention is to display the current state by displaying whether it is in an on state, an off state, or a trip state with only one display member. An object of the present invention is to provide a circuit breaker that can reliably grasp the state of the circuit.

上記目的を達成するために、請求項１の発明は、器体の内部に、固定接点および当該固定接点に接離自在に接触する可動接点を具備した接点部と、少なくとも操作部を器体の外部に露出させた状態で器体に対して回動自在に支持されたハンドルと、ハンドルの回動動作に応じて可動接点を固定接点に接離させるリンク機構と、電路に流れる異常電流を検知するとリンク機構を駆動して接点部を強制開極させるトリップ機構と、接点部のオン状態を表示するオン表示部、オフ状態を表示するオフ表示部およびトリップ状態を表示するトリップ表示部を具備してリンク機構に連結された表示部材とを備え、リンク機構は、接点部のオン動作、オフ動作およびトリップ動作に応じて、器体表面に設けた表示窓に臨む位置にオン表示部、オフ表示部およびトリップ表示部のうちの何れかを移動させることを特徴とする。 In order to achieve the above object, the invention of claim 1 is characterized in that a contact part provided with a fixed contact and a movable contact in contact with and separating from the fixed contact inside the container, and at least an operation part of the container is provided. A handle that is rotatably supported with respect to the body while being exposed to the outside, a link mechanism that moves the movable contact to and away from the fixed contact according to the turning movement of the handle, and detects an abnormal current flowing in the electric circuit Then, a trip mechanism that drives the link mechanism to forcibly open the contact portion, an on display portion that displays the on state of the contact portion, an off display portion that displays the off state, and a trip display portion that displays the trip state are provided. And a display member connected to the link mechanism. The link mechanism has an on-display unit and an off-display at a position facing a display window provided on the surface of the container according to the on-operation, off-operation, and trip operation of the contact portion. Department And wherein the moving the one of the fine trip display.

請求項１の発明によれば、１つの表示部材がオン表示部、オフ表示部およびトリップ表示部を有し、リンク機構による接点部のオン動作、オフ動作およびトリップ動作に応じて、器体表面に設けた表示窓に臨む位置にオン表示部、オフ表示部およびトリップ表示部のうちの何れかを移動させているので、１つの表示部材で接点部のオン状態、オフ状態およびトリップ状態を表示することができる。したがって、表示部材の表示を見るだけで、オン状態、オフ状態およびトリップ状態のうちの何れの状態であるかを判別できるから、表示部材の表示とハンドル位置とをもとに接点部の状態を判別する場合に比べて、接点部の状態を誤判断する可能性を低減できるという効果がある。 According to invention of Claim 1, one display member has an ON display part, an OFF display part, and a trip display part, and according to the ON operation of the contact part by a link mechanism, an OFF operation, and a trip operation, the body surface Since one of the ON display section, OFF display section, and trip display section is moved to a position facing the display window provided on the display, the ON, OFF, and trip states of the contact section are displayed with one display member. can do. Therefore, it is possible to determine which of the on state, the off state, and the trip state by simply looking at the display of the display member, so the state of the contact portion is determined based on the display of the display member and the handle position. Compared with the case of determination, there is an effect that the possibility of erroneous determination of the state of the contact portion can be reduced.

以下に本発明の実施の形態を図面に基づいて説明する。尚、以下の説明では特に断りがないかぎり、図１中の上側を回路遮断器の前側、下側を回路遮断器の後側、左側を回路遮断器の左側、右側を回路遮断器の右側と規定し、紙面に垂直な方向を回路遮断器の幅方向と規定する。 Embodiments of the present invention will be described below with reference to the drawings. In the following description, unless otherwise specified, the upper side in FIG. 1 is the front side of the circuit breaker, the lower side is the rear side of the circuit breaker, the left side is the left side of the circuit breaker, and the right side is the right side of the circuit breaker. The direction perpendicular to the paper surface is defined as the width direction of the circuit breaker.

本実施形態の回路遮断器は、図１、図２および図６（ａ）〜（ｄ）に示すように、ボディ２及びカバー３からなる器体１と、負荷等の電源線（図示せず）を接続するための負荷側端子部４Ａと、外部電源（図示せず）に電気的に接続するための電源側端子部４Ｂと、器体１内の所定位置に固定される固定接点７及び固定接点７に接離する可動接点８からなる接点部６と、開閉操作（オンオフ操作）に応じて接点部６を開閉させるリンク機構９と、異常電流（短絡電流および過負荷電流）を検知するとリンク機構９を駆動して接点部６を強制開極させるトリップ機構（電磁釈放機構部１１および熱動釈放機構部１２）と、接点部６の開極時に発生するアークを速やかに消弧するための消弧装置１３と、器体１（ボディ２）の前面に設けた表示窓１４に少なくとも一部を臨ませた状態で配置され、リンク機構９に連結されて、接点部６のオン状態、オフ状態およびトリップ状態を表示する合成樹脂製の表示部材１５とを備えている。 As shown in FIGS. 1, 2, and 6A to 6D, the circuit breaker according to the present embodiment includes a body 1 composed of a body 2 and a cover 3, and a power line (not shown) such as a load. ), A power supply side terminal portion 4B for electrical connection to an external power source (not shown), a fixed contact 7 fixed at a predetermined position in the body 1 and When detecting a contact portion 6 composed of a movable contact 8 that contacts and separates from the fixed contact 7, a link mechanism 9 that opens and closes the contact portion 6 in response to an opening / closing operation (on / off operation), and an abnormal current (short-circuit current and overload current) A trip mechanism (electromagnetic release mechanism section 11 and thermal release mechanism section 12) that drives the link mechanism 9 to forcibly open the contact section 6 and an arc that is generated when the contact section 6 is opened is quickly extinguished. Arc extinguishing device 13 and a display window provided on the front surface of body 1 (body 2) 4 are arranged in a state in which face at least a part, has been connected to the link mechanism 9, the on state of the contact portion 6, and a display member 15 made of synthetic resin that displays the off state and the trip state.

ボディ２及びカバー３は、それぞれ、絶縁性を有する合成樹脂により、幅方向の一面が開口した略箱状に形成されている。ボディ２とカバー３とは、互いの開口部を合わせ、ボディ２の四隅に突設されたボス２ｄをカバー３の側壁に設けた貫通孔に挿入した状態で、ボディ２の左右両側壁に設けた係止爪２ｃをカバー３の左右両側壁に設けた係止孔３ａに引掛係止させ、カバー３の表面から突出するボス２ｄの先端を潰すことにより、ボディ２とカバー３とが結合される。 The body 2 and the cover 3 are each formed in a substantially box shape with one surface opened in the width direction, using an insulating synthetic resin. The body 2 and the cover 3 are provided on the left and right side walls of the body 2 in a state where the openings of the body 2 and the bosses 2d protruding from the four corners of the body 2 are inserted into the through holes provided in the side wall of the cover 3. The locking claw 2c is hooked and locked in locking holes 3a provided on the left and right side walls of the cover 3, and the tip of the boss 2d protruding from the surface of the cover 3 is crushed, whereby the body 2 and the cover 3 are coupled. The

負荷側端子部４Ａおよび電源側端子部４Ｂは、それぞれ、電源側および負荷側からの電線（図示せず）を接続するためのものであって、導電性を有する金属板を用いて左右方向を軸方向とする角筒状に形成された端子金具１６，１６（所謂ピラー端子）と、導電性を有する金属板を略コ字状に折り曲げて形成され、コ字状部の下側片を端子金具１６の筒内に挿入した状態でボディ２内に配設される端子板５Ａ，５Ｂと、端子板５Ａ，５Ｂが備えるコ字状部の上側片に設けた挿通孔（図示せず）に遊嵌されて、端子金具１６，１６の前壁部に設けたねじ孔（図示せず）に螺合する固定ねじ１７，１７とを備えている。そして、負荷側端子部４Ａの端子板５Ａには電磁釈放機構部１１を構成するコイル１８が固着され、電源側端子部４Ｂの端子板５Ｂには熱動釈放機構部１２を構成する帯板状のバイメタル板１９に一端が固着された編組線２３ａの他端が固着されている。 4 A of load side terminal parts and 4 A of power supply side terminal parts are for connecting the electric wire (not shown) from the power supply side and a load side, respectively, Comprising: The left-right direction is used using the metal plate which has electroconductivity. Terminal brackets 16 and 16 (so-called pillar terminals) formed in a rectangular tube shape in the axial direction and a conductive metal plate are bent into a substantially U shape, and the lower piece of the U shape portion is a terminal. In the insertion state (not shown) provided in terminal board 5A, 5B arrange | positioned in the body 2 in the state which inserted in the cylinder of the metal fitting 16, and the U-shaped part with which terminal board 5A, 5B is equipped. Fixing screws 17 and 17 are provided that are loosely fitted and screwed into screw holes (not shown) provided in the front wall portions of the terminal fittings 16 and 16. And the coil 18 which comprises the electromagnetic release mechanism part 11 is adhering to the terminal board 5A of the load side terminal part 4A, and the strip | belt-plate shape which comprises the thermal release mechanism part 12 to the terminal board 5B of the power supply side terminal part 4B. The other end of the braided wire 23a having one end fixed to the bimetal plate 19 is fixed.

固定接点７は、器体１内部の所定位置に固定される固定接点板２０に固着されており、この固定接点板２０にはコイル１８の他端が固着されている。また可動接点８は、所定の厚みを有する金属板に抜き加工および曲げ加工を施して形成された可動接点アーム２２の一端部に設けられている。この可動接点アーム２２は、器体１の内壁に設けた円弧状のガイド溝２ｂ（図１参照）に沿って移動自在に取着される第２回動軸２１に対して他端側が回動自在に軸支されており、可動接点アーム２２の中間部には編組線２３ｂの一端側が固着されている。編組線２３ｂの他端側はバイメタル板１９の中間位置に固着されており、端子板５Ｂ−編組線２３ａ−バイメタル板１９−編組線２３ｂ−可動接点アーム２２−可動接点８−固定接点７−固定接点板２０−コイル１８−端子板５Ａの経路で電路が形成されている。 The fixed contact 7 is fixed to a fixed contact plate 20 fixed at a predetermined position inside the container body 1, and the other end of the coil 18 is fixed to the fixed contact plate 20. The movable contact 8 is provided at one end of a movable contact arm 22 formed by punching and bending a metal plate having a predetermined thickness. The movable contact arm 22 is pivoted at the other end with respect to a second pivot shaft 21 movably attached along an arcuate guide groove 2b (see FIG. 1) provided on the inner wall of the container body 1. The braided wire 23b is fixed to one end of the movable contact arm 22 at an intermediate portion thereof. The other end side of the braided wire 23b is fixed to an intermediate position of the bimetal plate 19. The terminal plate 5B-braided wire 23a-bimetal plate 19-braided wire 23b-movable contact arm 22-movable contact 8-fixed contact 7-fixed. An electric circuit is formed by a route of the contact plate 20 -the coil 18 -the terminal plate 5A.

リンク機構９は、ボディ２の前壁に設けた窓孔２ａから操作摘み（操作部）１０ａを外部に突出させた状態で、ボディ２に設けたハンドル軸２４に回動自在に支持される合成樹脂製のハンドル１０と、丸棒状の金属棒の両端部を一方向に折曲することによってコ字形に形成され、ハンドル１０に設けた軸穴１０ｂに一方の軸部が回動自在に軸支されたスラストバー２７と、所定の厚みを有する金属板に抜き加工および曲げ加工を施して形成され、器体１に設けた第１回動軸２５に中間部が回動自在に軸支されるとともに、スラストバー２７の他方の軸部を係脱自在に係合する係合部２６ａが一端側に設けられた支持部材２６と、所定の厚みを有する金属板に抜き加工および曲げ加工を施して形成され、中央部で支持部材２６とともに第１回動軸２５に回動自在に軸支され、一端側に設けたＬ字形の爪片２８と上述の係合部２６ａとの間にスラストバー２７の他方の軸部を係合するための閉空間を形成するとともに、他端側に第２回動軸２１が係入される長孔状のリンク孔２９が形成されたラッチ部材３０と、丸棒状の金属棒の両端部を一方向に折曲することによってコ字形に形成され、ハンドル１０において軸穴１０ｂよりもオフ回転側に円周方向に沿って設けられた長円状のガイド溝１０ｃに一方の軸部が係入されるとともに、支持部材２６に設けたＬ字形の係合片２６ｂに他端側の軸部が引掛掛止されるストップバー３１と、接点部６に接圧を与える接圧ばね３２と、第１回動軸２５を中心にしてラッチ部材３０の一端側の爪片２８が支持部材２６の係合部２６ａに近付く向きにラッチ部材３０を回転させる方向の付勢力をラッチ部材３０に与えるとともに、表示部材１５を第１回動軸２５の回りに反時計回りに回転させる方向の付勢力を表示部材１５に与えるラッチ用ばね３３とを備えている。なおハンドル１０には、ハンドル１０をオフ回転方向（図１における反時計回り方向）に弾性付勢する復帰ばね（図示せず）と、ストップバー３１の軸部をガイド溝１０ｃ内で右端方向（軸穴１０ｂに近い側）へ弾性付勢するリンクばね３４とが設けられている。 The link mechanism 9 is a composite that is rotatably supported by a handle shaft 24 provided in the body 2 in a state where an operation knob (operation part) 10a protrudes outside from a window hole 2a provided in the front wall of the body 2. A resin handle 10 and a round bar-shaped metal bar are bent in one direction to form a U shape, and one shaft is pivotally supported in a shaft hole 10b provided in the handle 10. The thrust bar 27 and a metal plate having a predetermined thickness are formed by punching and bending, and an intermediate portion is pivotally supported by a first rotation shaft 25 provided on the container 1. At the same time, the support member 26 provided on one end side with an engaging portion 26a for releasably engaging the other shaft portion of the thrust bar 27 and a metal plate having a predetermined thickness are subjected to punching and bending. Formed and pivoted together with support member 26 in the center A closed space for engaging the other shaft portion of the thrust bar 27 is formed between the L-shaped claw piece 28 provided on one end side and the above-described engaging portion 26a. In addition, the latch member 30 having the long hole-like link hole 29 into which the second rotation shaft 21 is engaged on the other end side and both ends of the round bar-shaped metal bar are bent in one direction. One shaft portion is inserted into an elliptical guide groove 10c that is formed in the circumferential direction on the off-rotation side of the shaft hole 10b in the handle 10 and is supported by the support member 26. The L-shaped engagement piece 26b provided at the center is centered on a stop bar 31 in which the shaft portion on the other end is hooked, a contact pressure spring 32 for applying contact pressure to the contact portion 6, and the first rotation shaft 25. The direction in which the claw piece 28 on one end side of the latch member 30 approaches the engaging portion 26a of the support member 26 A latching spring that applies an urging force in a direction to rotate the latch member 30 to the latch member 30 and also applies an urging force in a direction to rotate the display member 15 counterclockwise around the first rotation shaft 25 to the display member 15. 33. The handle 10 includes a return spring (not shown) that elastically biases the handle 10 in the off-rotation direction (counterclockwise direction in FIG. 1), and a shaft portion of the stop bar 31 in the guide groove 10c toward the right end ( A link spring 34 that elastically urges the shaft spring 10 toward the shaft hole 10b is provided.

表示部材１５は合成樹脂成型品からなり、ボディ２の前面に開口する表示窓１４内で、接点部６の状態（オン状態、オフ状態、トリップ状態の何れか）を表示するために用いられる。この表示部材１５は、図１、図７および図８に示すように、第１回動軸２５が挿入される軸孔４０ａを有し、支持部材２６およびラッチ部材３０とともに第１回動軸２５に回動自在に枢支される板状の回動体４０と、回動体４０の前側部の左側縁から幅方向の一側（図１における紙面手前側）に突出して、支持部材２６の係合片２６ｂに当接する当接片４１と、前面が第１回動軸２５を中心とする断面円弧状の曲面に形成されて少なくとも一部が表示窓１４に臨む部位に配置される表示面４２と、表示面４２の左側端の幅方向両側縁から、表示面４２の前面に沿って右側方向へそれぞれ延長形成された係止爪片４３，４３と、回動体４０の前側部から右斜め前方に突出して、回動体４０と表示面４２の後面との間を連結する連結片４４と、表示面４２の右側部後面より左斜め後方に向かって延出するガイド片４５と、回動体４０の前側部の右側縁から右側方向へ突出する突出片４６とを一体に備えている。なお表示面４２は円周方向の中間部に凹部を有し、この凹部がオフ状態を表示するオフ表示部４２ａとなっている。また表示面４２には円周方向においてオフ表示部４２ａの両側部に、オン状態を表示するオン表示部４２ｂと、トリップ状態を表示するトリップ表示部４２ｃとが設けられており、各表示部４２ａ〜４２ｃの色や表示内容を異ならせることで、オン状態とオフ状態とトリップ状態との判別が行えるようになっている。 The display member 15 is made of a synthetic resin molded product, and is used to display the state of the contact portion 6 (any of the on state, the off state, and the trip state) in the display window 14 that opens to the front surface of the body 2. As shown in FIGS. 1, 7, and 8, the display member 15 has a shaft hole 40 a into which the first rotation shaft 25 is inserted, and the first rotation shaft 25 together with the support member 26 and the latch member 30. The plate-like rotary body 40 pivotally supported by the rotary body 40 and the left side edge of the front side portion of the rotary body 40 project to one side in the width direction (the front side in the drawing in FIG. 1) to engage the support member 26. An abutment piece 41 that abuts on the piece 26b, and a display surface 42 that is formed in a curved surface having an arcuate cross section centered on the first rotation shaft 25 and at least partially facing the display window 14. , Locking claw pieces 43 and 43 that are formed to extend rightward along the front surface of the display surface 42 from both side edges in the width direction of the left end of the display surface 42, and diagonally right forward from the front side portion of the rotating body 40. A connecting piece 44 that protrudes and connects between the rotating body 40 and the rear surface of the display surface 42; A guide piece 45 extending toward the left oblique rear than the right side rear surface of the surface 42, are provided integrally with the projecting piece 46 projecting from the right edge of the front portion of the rotating body 40 to the right direction. In addition, the display surface 42 has a recessed part in the intermediate part of the circumferential direction, and this recessed part is the OFF display part 42a which displays an OFF state. Further, the display surface 42 is provided with an on display portion 42b for displaying an on state and a trip display portion 42c for displaying a trip state on both sides of the off display portion 42a in the circumferential direction, and each display portion 42a. By distinguishing the colors and display contents of .about.42c, the ON state, the OFF state, and the trip state can be distinguished.

接圧ばね３２は、両端部が互いに逆方向に突出する捩りコイルばねからなり中央の孔に第１回動軸２５が挿通されて、一端部がボディ２に設けたばね受け突起（図示せず）に当接する。また接圧ばね３２の他端部は、可動接点アーム２２において第２回動軸２１に対して可動接点８が設けられた一端側と反対側の端部に設けられたばね受け片２２ａに当接し、ばね受け片２２ａを図１中の右側へ弾性付勢することで、可動接点アーム２２を第２回動軸２１の回りに時計回りに回転する方向へ付勢するとともに、可動接点アーム２２に連結された支持部材２６を第１回動軸２５の回りに反時計回りに回転する方向へ付勢している。 The contact pressure spring 32 is a torsion coil spring having both ends projecting in opposite directions. The first rotation shaft 25 is inserted into a central hole, and one end is a spring receiving protrusion (not shown) provided on the body 2. Abut. The other end of the contact pressure spring 32 abuts against a spring receiving piece 22 a provided at the end of the movable contact arm 22 opposite to the one end where the movable contact 8 is provided with respect to the second rotating shaft 21. The spring receiving piece 22a is elastically urged to the right side in FIG. 1 to urge the movable contact arm 22 in the clockwise direction around the second rotating shaft 21, and to the movable contact arm 22. The connected support member 26 is urged in a direction to rotate counterclockwise around the first rotation shaft 25.

ラッチ用ばね３３は、捩りコイルばねからなり中央の孔に第１回動軸２５が挿通されて、一端部が表示部材１５の当接片４１に当接するとともに、他端部がラッチ部材３０に設けたばね受け片３０ａに当接する。このラッチ用ばね３３により、ラッチ部材３０の爪片２８が支持部材２６の係合部２６ａに近づき、且つ、爪片２８と係合部２６ａとで囲まれる空間（つまりスラストバー２７の軸部が挿入される空間）を閉空間とする方向へラッチ部材３０を回動させるような弾性付勢力がラッチ部材３０に与えられるとともに、表示部材１５を第１回動軸２５の回りに反時計回りに回転させる方向の付勢力が表示部材１５に与えられる。 The latch spring 33 is a torsion coil spring, and the first rotation shaft 25 is inserted through a central hole. One end of the latch spring 33 contacts the contact piece 41 of the display member 15, and the other end of the latch spring 33 is connected to the latch member 30. It abuts against the provided spring receiving piece 30a. The latch spring 33 causes the claw piece 28 of the latch member 30 to approach the engaging portion 26a of the support member 26, and the space surrounded by the claw piece 28 and the engaging portion 26a (that is, the shaft portion of the thrust bar 27 is An elastic urging force that rotates the latch member 30 in a direction in which the inserted space is closed is applied to the latch member 30 and the display member 15 is rotated counterclockwise around the first rotation shaft 25. The urging force in the rotating direction is given to the display member 15.

また上述したラッチ部材３０は、後端部の左側縁から延長形成されて電磁釈放機構部１１により押圧される略Ｌ字形の第１押圧片３５と、後端部の右側縁から延長形成されて熱動釈放機構部１２により押圧される略Ｌ字形の第２押圧片３６とを備えている。 The latch member 30 described above extends from the left side edge of the rear end portion and is formed to extend from the substantially L-shaped first pressing piece 35 that is pressed by the electromagnetic release mechanism 11 and from the right side edge of the rear end portion. And a substantially L-shaped second pressing piece 36 that is pressed by the thermal release mechanism 12.

ここにおいて本実施形態では、リンク機構９の構成部品、すなわち可動接点８を有する可動接点アーム２２と可動接点アーム２２を支持する支持部材２６とラッチ部材３０とスラストバー２７およびストップバー３１が全て金属部品で形成されているので、樹脂製の部品で構成した場合に比べて低コスト化を図ることができる。また、材料強度が合成樹脂よりも高い金属材料によりリンク機構９の構成部品を形成しているので、リンク機構９を構成する部品の小型化が可能であり、また温度に対する経年変化にも強いので、長期間に亘って動作性能を安定化させることができる。なお、ラッチ部材３０の第１押圧片３５に対向して熱動釈放機構部１２の押圧ピン３８が配置されているのであるが、リンク機構９の構成部品を全て金属製としているので、リンク機構９と熱動釈放機構部１２との絶縁を図る必要がある。そこで本実施形態では、押圧ピン３８を露出させる部位を除いてリンク機構９と熱動釈放機構部１２との間に配置される絶縁壁２ｅ，２ｆをボディ２の内壁から立設しており、絶縁壁２ｅ，２ｆによってリンク機構９と熱動釈放機構部１２との間の絶縁を図っている（図１及び図２参照）。 In this embodiment, the components of the link mechanism 9, that is, the movable contact arm 22 having the movable contact 8, the support member 26 that supports the movable contact arm 22, the latch member 30, the thrust bar 27, and the stop bar 31 are all made of metal. Since it is formed of parts, the cost can be reduced as compared with the case where the parts are made of resin. In addition, since the component parts of the link mechanism 9 are made of a metal material whose material strength is higher than that of synthetic resin, it is possible to reduce the size of the parts constituting the link mechanism 9 and to withstand aging with temperature. The operation performance can be stabilized over a long period of time. The pressing pin 38 of the thermal release mechanism portion 12 is disposed opposite to the first pressing piece 35 of the latch member 30. However, since all the components of the link mechanism 9 are made of metal, the link mechanism 9 and the thermal release mechanism 12 need to be insulated. Therefore, in the present embodiment, the insulating walls 2e and 2f disposed between the link mechanism 9 and the thermal release mechanism portion 12 are erected from the inner wall of the body 2 except for the portion where the pressing pin 38 is exposed. Insulation walls 2e and 2f provide insulation between the link mechanism 9 and the thermal release mechanism 12 (see FIGS. 1 and 2).

電磁釈放機構部１１は、絶縁性を有する合成樹脂により円筒状に形成されて、平角巻線からなるコイル１８が外周面に巻装されたコイルボビン３７と、コイルボビン３７の内部に設けられた磁性材料からなる固定鉄芯（図示せず）と、コイルボビン３７内に左右方向にスライド移動自在に設けられた磁性材料からなる可動鉄芯（図示せず）と、コイルボビン３７内に配置され、可動鉄芯を固定鉄芯から離れる方向に付勢する付勢ばね（図示せず）と、可動鉄心に結合されて先端部がコイルボビン３７の外側に突出し、可動鉄芯が固定鉄芯に吸引されると先端部でラッチ部材３０の第１押圧片３５を右方向に押圧する押圧ピン３８と、ヨーク３９とで構成されている。 The electromagnetic release mechanism unit 11 is formed in a cylindrical shape from an insulating synthetic resin, and has a coil bobbin 37 in which a coil 18 made of a rectangular winding is wound on an outer peripheral surface, and a magnetic material provided inside the coil bobbin 37. A fixed iron core (not shown) made of, a movable iron core (not shown) made of a magnetic material slidably moved in the left-right direction in the coil bobbin 37, and a movable iron core arranged in the coil bobbin 37. And a biasing spring (not shown) that biases the wire in a direction away from the fixed iron core, and a distal end portion that protrudes to the outside of the coil bobbin 37 by being coupled to the movable iron core. It comprises a pressing pin 38 that presses the first pressing piece 35 of the latch member 30 in the right direction, and a yoke 39.

ヨーク３９は、図１に示すように磁性材料によって左後部に切欠を有する略ロ字形に形成されており、左右方向において対向する一対の磁性片３９ａ，３９ｂと、一対の磁性片３９ａ，３９ｂの前側縁間を連結する連結片３９ｃとを一体に備えており、両磁性片３９ａ，３９ｂ間にコイルボビン３７が配置される。また右側の磁性片３９ｂには、上述の押圧ピン３８が挿通可能な挿通孔（図示せず）が形成されるとともに、磁性片３９ｂの後側縁（図１の下側縁）から左側に向かって消弧装置１３に対向配置される対向片３９ｄが延長形成されている。なおヨーク３９には、右側の磁性片３９ｂの一部を切り起こすことによって固着片３９ｅが形成されており、この固着片３９ｅの前側面にコイル１８の一端部が固着されるとともに、固着片３９ｅの後側面に固定接点板２０が固着されている。 As shown in FIG. 1, the yoke 39 is formed in a substantially square shape having a notch in the left rear portion by a magnetic material. The yoke 39 includes a pair of magnetic pieces 39a and 39b and a pair of magnetic pieces 39a and 39b opposed in the left-right direction. A connecting piece 39c for connecting the front edges is integrally provided, and a coil bobbin 37 is disposed between the magnetic pieces 39a and 39b. The right magnetic piece 39b is formed with an insertion hole (not shown) through which the above-described pressing pin 38 can be inserted, and from the rear edge (lower edge in FIG. 1) toward the left side of the magnetic piece 39b. A counter piece 39d that is disposed to face the arc extinguishing device 13 is extended. A fixed piece 39e is formed on the yoke 39 by cutting and raising a part of the right magnetic piece 39b. One end of the coil 18 is fixed to the front side surface of the fixed piece 39e, and the fixed piece 39e. A fixed contact plate 20 is fixed to the rear side surface.

而して電磁釈放機構部１１では、コイル１８に電流が流れていない状態（初期状態）では、可動鉄芯が復帰ばねの付勢力によって固定鉄芯から離間しており、可動鉄芯に連結された押圧ピン３８が左端の位置まで後退している。一方、端子部４Ａ，４Ｂ間に電流が流れて、コイル１８に通電されると、固定鉄芯−ヨーク３９−可動鉄芯を通過する磁路の磁気抵抗を小さくするように可動鉄芯と固定鉄芯との間で吸引力が作用し、コイル１８に流れる電流が短絡電流等の過大な電流である場合には、復帰ばねの付勢力に抗して可動鉄芯が固定鉄芯側へ移動することになる。このとき、可動鉄芯に連結された押圧ピン３８が右方向へ突出し、押圧ピン３８の先端部でラッチ部材３０の第１押圧片３５が右側へ押圧されて、リンク機構９によるトリップ動作が行われる。トリップ動作が行われて接点部６が強制開極されると、コイル１８に流れる電流が減少して可動鉄芯に作用する吸引力が低下するため、復帰ばねの付勢力によって可動鉄芯が初期位置に移動し、押圧ピン３８が左端の初期位置まで後退する。 Thus, in the electromagnetic release mechanism 11, when no current flows through the coil 18 (initial state), the movable iron core is separated from the fixed iron core by the urging force of the return spring and is connected to the movable iron core. The pressing pin 38 is retracted to the left end position. On the other hand, when a current flows between the terminal portions 4A and 4B and the coil 18 is energized, it is fixed to the movable iron core so as to reduce the magnetic resistance of the magnetic path passing through the fixed iron core-yoke 39-movable iron core. When an attractive force acts between the iron core and the current flowing in the coil 18 is an excessive current such as a short circuit current, the movable iron core moves toward the fixed iron core against the biasing force of the return spring. Will do. At this time, the pressing pin 38 connected to the movable iron core protrudes to the right, the first pressing piece 35 of the latch member 30 is pressed to the right side at the tip of the pressing pin 38, and the trip operation by the link mechanism 9 is performed. Is called. When the tripping operation is performed and the contact portion 6 is forcibly opened, the current flowing through the coil 18 is reduced and the attractive force acting on the movable iron core is reduced. Therefore, the movable iron core is initialized by the biasing force of the return spring. Move to the position, and the push pin 38 retracts to the initial position at the left end.

熱動釈放機構部１２を構成するバイメタル板１９としては、自己発熱によって湾曲する形式の直熱型や、板状のヒータが積層されヒータによる加熱で湾曲する傍熱型のものを用いることができる。バイメタル板１９に電流が流れていない状態ではバイメタル板１９は湾曲せず、バイメタル板１９の先端部は第２押圧片３６に当接していない。一方、端子部４Ａ，４Ｂ間に過負荷電流のような過大な電流が流れると、電路を流れる過負荷電流によってバイメタル板１９の温度が上昇し、それに応じてバイメタル板１９が湾曲するため、バイメタル板１９の先端が第２押圧片３６を右側へ押圧して、リンク機構９によるトリップ動作が行われる。トリップ動作が行われて接点部６が強制開極されると、バイメタル板１９に流れる電流が減少し、その温度が低下してバイメタル板１９の湾曲度合いが小さくなり、やがてバイメタル板１９の先端部がラッチ部材３６の第２押圧片３６から離れた初期状態に戻る。 As the bimetal plate 19 constituting the thermal release mechanism 12, a direct heating type that is curved by self-heating, or a side heating type that is laminated with plate-like heaters and is curved by heating with the heater can be used. . In a state where no current flows through the bimetal plate 19, the bimetal plate 19 is not curved, and the tip of the bimetal plate 19 is not in contact with the second pressing piece 36. On the other hand, when an excessive current such as an overload current flows between the terminal portions 4A and 4B, the temperature of the bimetal plate 19 rises due to the overload current flowing through the electric circuit, and the bimetal plate 19 is bent accordingly, so that the bimetal The tip of the plate 19 presses the second pressing piece 36 to the right, and the trip operation by the link mechanism 9 is performed. When the trip operation is performed and the contact portion 6 is forcibly opened, the current flowing through the bimetal plate 19 decreases, the temperature decreases, the degree of bending of the bimetal plate 19 decreases, and the tip of the bimetal plate 19 eventually. Returns to the initial state away from the second pressing piece 36 of the latch member 36.

消弧装置１３は、図１及び図２に示すようにアーク走行板１３ａと消弧グリッド１３ｂとで構成される。アーク走行板１３ａは、帯板状の金属板を曲成することによって形成され、バイメタル板１９の基部が一端に結合されており、器体１の下側壁に沿って器体１の左側へ延設されるとともに、前後方向においてヨーク３９の対向片３９ｄと重複する消弧片１３ｃを他端側に備えている。消弧グリッド１３ｂは、前後方向に所定の間隔をおいて平行配置された複数枚の導電板からなる消弧板１３ｄと、絶縁材料により形成されて消弧板１３ｄの幅方向における両面をそれぞれ覆う支持板１３ｅとで構成されている。ここで、消弧グリッド１３ｂは、アーク走行板１３ａの消弧片１３ｃと、ヨーク３９の対向片３９ｄのそれぞれに消弧板１３ｄが平行するようにして、消弧片１３ｃとヨーク３９の対向片３９ｄとの間に配設されている。この消弧装置１３によれば、可動接点８が固定接点７から離れる際にアークが生じた場合に、アークを引き伸ばして消弧することができる。尚、消弧装置１３は従来周知のものを用いることができるので、本実施形態では詳細な説明を省略する。 As shown in FIGS. 1 and 2, the arc extinguishing device 13 includes an arc travel plate 13a and an arc extinguishing grid 13b. The arc travel plate 13a is formed by bending a strip-shaped metal plate, the base of the bimetal plate 19 is coupled to one end, and extends to the left side of the vessel 1 along the lower side wall of the vessel 1. The arc extinguishing piece 13c that overlaps with the opposing piece 39d of the yoke 39 in the front-rear direction is provided on the other end side. The arc extinguishing grid 13b covers the arc extinguishing plate 13d composed of a plurality of conductive plates arranged in parallel at a predetermined interval in the front-rear direction, and both sides in the width direction of the arc extinguishing plate 13d formed of an insulating material. It is comprised with the support plate 13e. Here, the arc extinguishing grid 13b is formed so that the arc extinguishing piece 13c of the arc traveling plate 13a and the opposing piece 39d of the yoke 39 are parallel to the arc extinguishing plate 13d, respectively. 39d. According to the arc extinguishing device 13, when an arc is generated when the movable contact 8 leaves the fixed contact 7, the arc can be extended and extinguished. Since the arc extinguishing device 13 can be a conventionally known one, detailed description thereof is omitted in this embodiment.

次に、回路遮断器の動作について図１〜図５を参照して説明する。なお図１および図２はオフ状態の説明図、図３はオン状態の説明図、図４はトリップ直後の状態を示す説明図、図５は接点部６の溶着状態を示す説明図である。 Next, the operation of the circuit breaker will be described with reference to FIGS. 1 and FIG. 2 are explanatory diagrams of an off state, FIG. 3 is an explanatory diagram of an on state, FIG. 4 is an explanatory diagram illustrating a state immediately after a trip, and FIG. 5 is an explanatory diagram illustrating a welded state of the contact portion 6.

図１に示すように、オフ状態ではハンドル１０がハンドルばねの付勢力によってオフ回転方向（図１中の反時計回り）に回転し、操作摘み１０ａが窓孔２ａの左端縁に当接する位置で停止している。この時、ハンドル１０の回動に伴ってスラストバー２７およびストップバー３１が前側（図１の上側）に引き上げられ、スラストバー２７が支持部材２６を押圧する力が無くなるので、接圧ばね３２のばね復帰力によって支持部材２６が第１回動軸２５を中心に反時計回りに回転するとともに、可動接点アーム２２が第２回動軸２１を中心に時計回りに回転する。そして支持部材２６は、第２回動軸２１がガイド溝２ｂの終端位置まで移動した位置で停止し、可動接点アーム２２は、上端部の左側縁から突出するストッパ片２２ｂが支持部材２６の係合片２６ｂに当接した位置で停止しており、可動接点アーム２２の下端側に設けた可動接点８が固定接点７から開離している。またラッチ部材３０はラッチ用ばね３３のばね力を受けて図１中時計回りに回転するのであるが、爪片２８がスラストバー２７の軸部と係合する位置で、ラッチ部材３０の回転が停止する。また更に表示部材１５もラッチ用ばね３３のばね力を受けて図１中反時計回りに回転し、図１および図９（ａ）に示すように表示部材１５の係止爪片４３が器体１の内壁に設けた係止突起４７と係止する位置で停止する。この時、表示部材１５の表示面４２において円周方向の中間部（オフ表示部４２ａ）がボディ２の表示窓１４から露出する。 As shown in FIG. 1, in the off state, the handle 10 is rotated in the off-rotation direction (counterclockwise in FIG. 1) by the urging force of the handle spring, and the operation knob 10a is in a position where it abuts against the left edge of the window hole 2a. It has stopped. At this time, the thrust bar 27 and the stop bar 31 are pulled up to the front side (upper side in FIG. 1) with the rotation of the handle 10, and the force with which the thrust bar 27 presses the support member 26 is lost. The spring return force causes the support member 26 to rotate counterclockwise about the first rotation shaft 25, and the movable contact arm 22 rotates clockwise about the second rotation shaft 21. The support member 26 stops at the position where the second rotating shaft 21 has moved to the end position of the guide groove 2b, and the movable contact arm 22 has a stopper piece 22b protruding from the left edge of the upper end portion thereof. The movable contact 8 provided at the lower end side of the movable contact arm 22 is separated from the fixed contact 7 at a position in contact with the combined piece 26b. The latch member 30 receives the spring force of the latch spring 33 and rotates clockwise in FIG. 1. However, the latch member 30 rotates at the position where the claw piece 28 engages with the shaft portion of the thrust bar 27. Stop. Further, the display member 15 also receives the spring force of the latching spring 33 and rotates counterclockwise in FIG. 1, and the locking claw piece 43 of the display member 15 becomes a container as shown in FIGS. 1 and 9A. 1 is stopped at a position where it engages with a locking projection 47 provided on the inner wall of 1. At this time, a circumferential intermediate portion (off display portion 42 a) is exposed from the display window 14 of the body 2 on the display surface 42 of the display member 15.

また接点部６がオフの状態（図１参照）で、ハンドル１０の操作摘み１０ａをオフ位置からオン方向（図１中の右回り方向）へ回転移動させると、ハンドル１０の回転に伴って、スラストバー２７の他端側の軸部が支持部材２６の係合部２６ａを押圧することによって、支持部材２６を第１回動軸２５の周りに図１中右回りに回転させ、支持部材２６の後端部に取着された第２回動軸２１をガイド溝２ｂに沿って固定接点板２０に近付く方向（図１中の左側）へスライド移動させる。また第２回動軸２１に軸支された可動接点アーム２２は、ばね受け片２２ａが接圧ばね３２によって右側方向に付勢されているので、第２回動軸２１のスライド移動に伴って、可動接点アーム２２の全体が図中左側へ移動するとともに、可動接点アーム２２が第２回動軸２１を中心に図１中時計回りに回転するのであるが、ハンドル１０の回転に伴ってストップバー３１の他方（後側）の軸部が後側へ移動して可動接点アーム２２のストッパ片２２ｂに当接すると、ストップバー３１によって可動接点アーム２２の回転が止められ、器体に対する可動接点アーム２２の回転位置はそのままで第２回動軸２１が図１中の左側へスライド移動する。そして、第２回動軸２１のスライド移動に応じて、ハンドル１０のガイド溝１０ｃ内に係入されたストップバー３１の一方の軸部が、ストップバー３１の他方の軸部（可動接点アーム２２のストッパ片２２ｂを押圧する側）とハンドル軸２４とを結ぶ線分を超えて図１中の左側に移動すると、ストップバー３１の軸部がストッパ片２２ｂを押圧する力が無くなるので、ストップバー３１により回転を止められている間に接圧ばね３２に蓄積された付勢力によって、可動接点アーム２２が第２回動軸２１を中心に図１中時計回りに急速に回転し、可動接点８が固定接点７に短時間で接触することになるから、アークの発生を防止することができる。 When the operation knob 10a of the handle 10 is rotated from the OFF position to the ON direction (clockwise direction in FIG. 1) in the state where the contact portion 6 is OFF (see FIG. 1), along with the rotation of the handle 10, The shaft portion on the other end side of the thrust bar 27 presses the engaging portion 26 a of the support member 26, thereby rotating the support member 26 around the first rotation shaft 25 clockwise in FIG. The second rotating shaft 21 attached to the rear end portion is slid in the direction approaching the fixed contact plate 20 (left side in FIG. 1) along the guide groove 2b. Further, the movable contact arm 22 pivotally supported by the second rotating shaft 21 has the spring receiving piece 22a biased in the right direction by the contact pressure spring 32, so that the sliding movement of the second rotating shaft 21 is accompanied. The entire movable contact arm 22 moves to the left in the figure, and the movable contact arm 22 rotates clockwise around the second rotation shaft 21 in FIG. When the other (rear) shaft portion of the bar 31 moves rearward and comes into contact with the stopper piece 22b of the movable contact arm 22, the stop of the movable contact arm 22 is stopped by the stop bar 31, and the movable contact with respect to the body is performed. The second rotation shaft 21 slides to the left in FIG. 1 while keeping the rotation position of the arm 22 as it is. Then, according to the sliding movement of the second rotation shaft 21, one shaft portion of the stop bar 31 engaged in the guide groove 10c of the handle 10 is connected to the other shaft portion (movable contact arm 22) of the stop bar 31. 1 and the handle shaft 24 is moved to the left in FIG. 1, the shaft bar portion of the stop bar 31 has no force to press the stopper piece 22b. Due to the urging force accumulated in the contact pressure spring 32 while the rotation is stopped by 31, the movable contact arm 22 rapidly rotates clockwise in FIG. Can contact the fixed contact 7 in a short time, so that the generation of an arc can be prevented.

そして、ハンドル１０がオン位置まで回転した状態では、スラストバー２７の一端側の軸部（軸穴１０ｂに枢支される側）が、ハンドル軸２４とスラストバー２７の他端側の軸部とを結ぶ線を越えて反対側（後側）へ移動するので、接圧ばね３２のばね力とハンドルばねのばね力などがバランスしてハンドル１０がオン位置で保持され、接点部６が閉極状態となる（図３参照）。またハンドル１０の回転に伴って支持部材２６が時計回りに回転すると、支持部材２６の係合片２６ｂがラッチ用ばね３３のばね力に抗して表示部材１５の当接片４１を前側へ押圧することによって、表示部材１５が第１回動軸２５を中心に図１中の時計回りに回転する。オン状態における表示部材１５の回転位置は、閉極状態で係合片２６ｂと当接片４１とが接触する位置で決まり、図３および図９（ｂ）に示すように表示部材１５の表示面４２において円周方向の左側部（オン表示部４２ｂ）が表示窓１４から露出する。またラッチ部材３０はラッチ用ばね３３のばね力を受けて図１中時計回りに回転するのであるが、爪片２８がスラストバー２７の軸部と係合する位置で、ラッチ部材３０の回転が停止する。なお、オン状態においては接圧ばね３２のばね力によって可動接点８と固定接点７との接圧が得られるようになっている。 When the handle 10 is rotated to the ON position, the shaft portion on one end side of the thrust bar 27 (the side pivoted on the shaft hole 10b) is connected to the shaft portion on the other end side of the handle shaft 24 and the thrust bar 27. Is moved to the opposite side (rear side) beyond the connecting line, the spring force of the contact pressure spring 32 and the spring force of the handle spring are balanced and the handle 10 is held in the on position, and the contact portion 6 is closed. A state is reached (see FIG. 3). When the support member 26 rotates clockwise as the handle 10 rotates, the engagement piece 26b of the support member 26 presses the contact piece 41 of the display member 15 forward against the spring force of the latch spring 33. Thus, the display member 15 rotates about the first rotation shaft 25 in the clockwise direction in FIG. The rotation position of the display member 15 in the ON state is determined by the position where the engagement piece 26b and the contact piece 41 are in contact with each other in the closed state, and the display surface of the display member 15 as shown in FIGS. 3 and 9B. At 42, the left side in the circumferential direction (ON display portion 42 b) is exposed from the display window 14. The latch member 30 receives the spring force of the latch spring 33 and rotates clockwise in FIG. 1. However, the latch member 30 rotates at the position where the claw piece 28 engages with the shaft portion of the thrust bar 27. Stop. In the ON state, the contact pressure between the movable contact 8 and the fixed contact 7 is obtained by the spring force of the contact pressure spring 32.

また接点部６がオンの状態（図３参照）で、ハンドル１０の操作摘み１０ａをオン位置からオフ側へ回転移動させると、ハンドル１０の回転に伴ってスラストバー２７およびストップバー３１が前側（図３の上側）に引き上げられ、スラストバー２７が支持部材２６を押圧する力が無くなるので、接圧ばね３２のばね復帰力によって支持部材２６が第１回動軸２５を中心に反時計回りに回転するとともに、可動接点アーム２２が第２回動軸２１を中心に時計回りに回転する。なお支持部材２６は、第２回動軸２１がガイド溝２ｂの終端位置まで移動した位置で停止するとともに、可動接点アーム２２は、上端部の左側縁から突出するストッパ片２２ｂが支持部材２６の係合片２６ｂに当接した位置で停止し、接点部６が開極する。ここにおいて、ハンドル１０をオフ方向へ回転させる際に、スラストバー２７の一端側の軸部（軸穴１０ｂに枢支される側）が、ハンドル軸２４とスラストバー２７の他端側とを結ぶ線を越えて反対側へ移動すると、ハンドルばねのばね力によりハンドル１０がオフ方向へ急速に回転するので、可動接点８が固定接点７から短時間で引き外されて、アークの発生を防止することができる。そして、接点部６のオフ時には爪片２８がスラストバー２７の軸部と係合する位置でラッチ部材３０の回転が停止し、表示部材１５は、表示面４２において円周方向の中間部（オフ表示部４２ａ）が表示窓１４から露出する位置で停止する。 When the operation knob 10a of the handle 10 is rotated from the ON position to the OFF side while the contact portion 6 is ON (see FIG. 3), the thrust bar 27 and the stop bar 31 are moved to the front ( 3, and the thrust bar 27 does not have the force to press the support member 26, so that the support member 26 is counterclockwise about the first rotation shaft 25 by the spring return force of the contact pressure spring 32. While rotating, the movable contact arm 22 rotates clockwise around the second rotation shaft 21. The support member 26 stops at the position where the second rotating shaft 21 has moved to the end position of the guide groove 2b, and the movable contact arm 22 has a stopper piece 22b protruding from the left edge of the upper end portion of the support member 26. It stops at the position where it abuts on the engagement piece 26b, and the contact portion 6 opens. Here, when the handle 10 is rotated in the off direction, the shaft portion on one end side of the thrust bar 27 (the side pivotally supported by the shaft hole 10 b) connects the handle shaft 24 and the other end side of the thrust bar 27. When moving beyond the line to the opposite side, the handle 10 rapidly rotates in the off direction due to the spring force of the handle spring, so that the movable contact 8 is removed from the fixed contact 7 in a short time to prevent arcing. be able to. Then, when the contact portion 6 is turned off, the rotation of the latch member 30 stops at a position where the claw piece 28 engages with the shaft portion of the thrust bar 27, and the display member 15 is positioned on the display surface 42 in the circumferential intermediate portion (off). The display unit 42 a) stops at a position where it is exposed from the display window 14.

次に熱動釈放機構部１２および電磁釈放機構部１１によるトリップ動作について説明する。まず熱動釈放機構部１２によるトリップ動作について説明する。接点部６のオン時（図３参照）に過負荷電流のような異常電流が電路に流れると、電路を流れる過大な電流によってバイメタル板１９の温度が上昇し、やがてバイメタル板１９が湾曲するので、バイメタル板１９の前端部（図３の上側部）によりラッチ部材３０の第２押圧片３６がラッチ用ばね３３のばね力に抗して右方向に押圧される。このとき、ラッチ部材３０が第１回動軸２５を中心に反時計回りに回転することによって、爪片２８が支持部材２６から離れる方向へ移動し、爪片２８と係合部２６ａとで囲まれる空間が開空間となる。この空間が開空間になると、スラストバー２７の他端側の軸部（軸穴１０ｂで軸支される側と反対側）が爪片２８と支持部材２６で囲まれる空間から外側に外れ、ハンドル１０からの力が支持部材２６に加わらなくなるので、接圧ばね３２のばね復帰力によって支持部材２６が第１回動軸２５を中心に反時計回りに回転するとともに、可動接点アーム２２が第１回動軸２１を中心に時計回りに回転する。そして支持部材２６は、第２回動軸２１がガイド溝２ｂの終端位置まで移動した位置で停止し、可動接点アーム２２は、上端部の左側縁から突出するストッパ片２２ｂが支持部材２６の係合片２６ｂに当接した位置で停止しており、可動接点８が固定接点７から強制的に開極させられる。またスラストバー２７の他端側の軸部が爪片２８と支持部材２６で囲まれる空間から外に出る際には、支持部材２６の回転によってスラストバー２７の軸部が前側に跳ね上げられ、それによってスライドバー２７の軸部が表示部材１５のガイド片４５を前側に跳ね上げるから、表示部材１５が第１回動軸２５を中心に反時計回りに回転させられて、図４および図９（ｃ）に示すように係止爪片４３が器体１の内壁の係止突起４７を乗り越える位置まで回転する。すなわち表示部材１５は、オフ状態の位置よりもさらに左側まで移動することになり、表示面４２において円周方向の右側部（トリップ表示部４２ｃ）が表示窓１４から露出する。またトリップ動作が行われると、ハンドル１０がハンドルばねのばね力によってオン位置からオフ位置まで回転し、ハンドル１０の回転に伴ってスラストバー２７の他端側の軸部が図４中の左側へ引っ張られると、この軸部がガイド片４５に案内されてラッチ部材３０の爪片２８と支持部材２６の係合部２６ａとで囲まれる空間内に入り込むので、表示部材１５の回転位置を除けばオフ状態と同様の状態となる。 Next, the trip operation by the thermal release mechanism 12 and the electromagnetic release mechanism 11 will be described. First, the trip operation by the thermal release mechanism 12 will be described. When an abnormal current such as an overload current flows in the electric circuit when the contact portion 6 is turned on (see FIG. 3), the temperature of the bimetal plate 19 rises due to an excessive current flowing in the electric circuit, and the bimetal plate 19 is bent eventually. The second pressing piece 36 of the latch member 30 is pressed rightward against the spring force of the latching spring 33 by the front end portion (upper portion in FIG. 3) of the bimetal plate 19. At this time, the latch member 30 rotates counterclockwise about the first rotation shaft 25, so that the claw piece 28 moves away from the support member 26 and is surrounded by the claw piece 28 and the engaging portion 26a. The open space becomes an open space. When this space becomes an open space, the shaft portion on the other end side of the thrust bar 27 (the side opposite to the side pivotally supported by the shaft hole 10b) comes out of the space surrounded by the claw piece 28 and the support member 26, and the handle 10 is not applied to the support member 26, the spring return force of the contact pressure spring 32 causes the support member 26 to rotate counterclockwise about the first rotation shaft 25, and the movable contact arm 22 is It rotates clockwise about the rotation shaft 21. The support member 26 stops at the position where the second rotating shaft 21 has moved to the end position of the guide groove 2b, and the movable contact arm 22 has a stopper piece 22b protruding from the left edge of the upper end portion. The moving contact 8 is forcibly opened from the fixed contact 7 at a position where it abuts on the combined piece 26b. Further, when the shaft portion on the other end side of the thrust bar 27 goes out of the space surrounded by the claw piece 28 and the support member 26, the shaft portion of the thrust bar 27 is flipped up to the front side by the rotation of the support member 26, As a result, the shaft portion of the slide bar 27 jumps up the guide piece 45 of the display member 15 to the front side, so that the display member 15 is rotated counterclockwise around the first rotation shaft 25, and FIGS. As shown in (c), the locking claw piece 43 rotates to a position over the locking projection 47 on the inner wall of the vessel 1. That is, the display member 15 moves further to the left than the position in the off state, and the right side portion (trip display portion 42 c) in the circumferential direction is exposed from the display window 14 on the display surface 42. When the trip operation is performed, the handle 10 is rotated from the on position to the off position by the spring force of the handle spring, and the shaft portion on the other end side of the thrust bar 27 moves to the left side in FIG. When pulled, the shaft portion is guided by the guide piece 45 and enters the space surrounded by the claw piece 28 of the latch member 30 and the engaging portion 26a of the support member 26, so that the rotation position of the display member 15 is excluded. The state is similar to the off state.

また接点部６がオンしている状態（図３参照）で、電路に短絡電流のような異常電流が流れると、コイル１８に流れる電流によって磁界が発生し、固定鉄芯−ヨーク３９−可動鉄芯を通過する磁路の磁気抵抗を小さくするように可動鉄芯と固定鉄芯との間で吸引力が作用して、可動鉄芯が固定鉄芯側へ移動する。このとき、可動鉄芯の移動に応じて押圧ピン３８が右方向へ突出し、押圧ピン３８の先端部でラッチ部材３０の第１押圧片３５が右側へ押圧されるので、ラッチ部材３０が第１回動軸２５を中心として図３中反時計回りに回転する。このとき、爪片２８が支持部材２６の係合部２６ａから離れる方向へ移動して、爪片２８と係合部２６ａとで囲まれる空間が開空間となり、スラストバー２７の他端側の軸部がこの空間から外側に出るので、上述した熱動釈放機構部１２の場合と同様のトリップ動作が行われて接点部６が強制開極される。 In addition, when an abnormal current such as a short circuit current flows in the electric circuit with the contact portion 6 turned on (see FIG. 3), a magnetic field is generated by the current flowing in the coil 18, and the fixed iron core-yoke 39-movable iron. An attractive force acts between the movable iron core and the fixed iron core so as to reduce the magnetic resistance of the magnetic path passing through the core, and the movable iron core moves to the fixed iron core side. At this time, the pressing pin 38 protrudes in the right direction according to the movement of the movable iron core, and the first pressing piece 35 of the latch member 30 is pressed to the right side by the tip portion of the pressing pin 38. It rotates counterclockwise in FIG. 3 about the rotation shaft 25. At this time, the claw piece 28 moves away from the engaging portion 26 a of the support member 26, and a space surrounded by the claw piece 28 and the engaging portion 26 a becomes an open space, and the shaft on the other end side of the thrust bar 27. Since the portion comes out of this space, the same tripping operation as in the case of the thermal release mechanism portion 12 described above is performed, and the contact portion 6 is forcibly opened.

なおトリップ状態から復帰させる場合、ハンドル１０の操作摘み１０ａをオフ位置からオン方向（図１中時計回り方向）へ回転移動させると、ハンドル１０の回転に伴って、スラストバー２７の他端側の軸部が支持部材２６の係合部２６ａを押圧することによって、支持部材２６を第１回動軸２５の周りに図１中右回りに回転させ、支持部材２６の後端部に取着された第２回動軸２１をガイド溝２ｂに沿って固定接点板２０に近付く方向（図１中の左側）へスライド移動させる。また第２回動軸２１に軸支された可動接点アーム２２は、ばね受け片２２ａが接圧ばね３２によって右側方向に付勢されているので、第２回動軸２１のスライド移動に伴って、可動接点アーム２２の全体が図中左側へ移動するとともに、可動接点アーム２２が第２回動軸２１を中心に図１中時計回りに回転するのであるが、ハンドル１０の回転に伴ってストップバー３１の他方（後側）の軸部が後側へ移動して可動接点アーム２２のストッパ片２２ｂに当接すると、ストップバー３１によって可動接点アーム２２の回転が止められ、器体に対する可動接点アーム２２の回転位置はそのままで第２回動軸２１が図１中の左側へスライド移動する。そして、第２回動軸２１のスライド移動に応じて、ハンドル１０のガイド溝１０ｃ内に係入されたストップバー３１の一方の軸部が、ストップバー３１の他方の軸部（可動接点アーム２２のストッパ片２２ｂを押圧する側）とハンドル軸２４とを結ぶ線分を超えて図１中の左側に移動すると、ストップバー３１の軸部がストッパ片２２ｂを押圧する力が無くなるので、ストップバー３１により回転を止められている間に接圧ばね３２に蓄積された付勢力によって、可動接点アーム２２が第２回動軸２１を中心に図１中時計回りに急速に回転し、可動接点８が固定接点７に短時間で接触することになる。そして、ハンドル１０がオン位置まで回転した状態では、スラストバー２７の一端側の軸部（軸穴１０ｂに枢支される側）が、ハンドル軸２４とスラストバー２７の他端側の軸部とを結ぶ線を越えて反対側（後側）へ移動するので、接圧ばね３２のばね力とハンドルばねのばね力などがバランスして、ハンドル１０がオン位置で保持される（図３参照）。またこの時、支持部材２６の係合片２６ｂがラッチ用ばね３３のばね力に抗して表示部材１５の当接片４１を前側へ押圧することによって、表示部材１５が第１回動軸２５を中心に図１中の時計回りに回転し、図３および図９（ｂ）に示すように表示部材１５の表示面４２において円周方向の左側部（オン表示部４２ｂ）が表示窓１４から露出する。 When returning from the trip state, if the operation knob 10a of the handle 10 is rotated from the OFF position to the ON direction (clockwise in FIG. 1), the other end side of the thrust bar 27 is moved along with the rotation of the handle 10. When the shaft portion presses the engaging portion 26 a of the support member 26, the support member 26 is rotated clockwise in FIG. 1 around the first rotation shaft 25 and is attached to the rear end portion of the support member 26. The second rotating shaft 21 is slid along the guide groove 2b in the direction approaching the fixed contact plate 20 (left side in FIG. 1). Further, the movable contact arm 22 pivotally supported by the second rotating shaft 21 has the spring receiving piece 22a biased in the right direction by the contact pressure spring 32, so that the sliding movement of the second rotating shaft 21 is accompanied. The entire movable contact arm 22 moves to the left in the figure, and the movable contact arm 22 rotates clockwise around the second rotation shaft 21 in FIG. When the other (rear) shaft portion of the bar 31 moves rearward and comes into contact with the stopper piece 22b of the movable contact arm 22, the stop of the movable contact arm 22 is stopped by the stop bar 31, and the movable contact with respect to the body is performed. The second rotation shaft 21 slides to the left in FIG. 1 while keeping the rotation position of the arm 22 as it is. Then, according to the sliding movement of the second rotation shaft 21, one shaft portion of the stop bar 31 engaged in the guide groove 10c of the handle 10 is connected to the other shaft portion (movable contact arm 22) of the stop bar 31. 1 and the handle shaft 24 is moved to the left in FIG. 1, the shaft bar portion of the stop bar 31 has no force to press the stopper piece 22b. Due to the urging force accumulated in the contact pressure spring 32 while the rotation is stopped by 31, the movable contact arm 22 rapidly rotates clockwise in FIG. Will contact the fixed contact 7 in a short time. When the handle 10 is rotated to the ON position, the shaft portion on one end side of the thrust bar 27 (the side pivoted on the shaft hole 10b) is connected to the shaft portion on the other end side of the handle shaft 24 and the thrust bar 27. Is moved to the opposite side (rear side) beyond the line connecting the two, the spring force of the contact pressure spring 32 and the spring force of the handle spring balance, and the handle 10 is held in the on position (see FIG. 3). . At this time, the engagement piece 26b of the support member 26 presses the contact piece 41 of the display member 15 forward against the spring force of the latch spring 33, so that the display member 15 is moved to the first rotation shaft 25. 1 is rotated clockwise in FIG. 1, and as shown in FIGS. 3 and 9B, the left side portion (on display portion 42 b) in the circumferential direction on the display surface 42 of the display member 15 extends from the display window 14. Exposed.

このように本実施形態では、接点部６のオン動作、オフ動作およびトリップ動作に応じて、器体１表面に設けた表示窓１４に臨む位置に、表示部材１５のオン表示部４２ｂ、オフ表示部４２ａおよびトリップ表示部４２ｃのうちの何れかを移動させることができる。すなわち表示窓１４から露出する表示面４２の部位は、接点部６のオフ状態、オン状態およびトリップ状態の３つの状態でそれぞれ異なっており、各々の状態で表示窓１４から露出する表示面４２の部位（オン表示部４２ｂ、オフ表示部４２ａおよびトリップ表示部４２ｃ）の色や表示内容（例えば文字）などを異ならせることによって、１つの表示部材１５で接点部６のオフ状態、オン状態およびトリップ状態をそれぞれ表示することができる。したがって、表示部材１５の表示を見るだけで、オン状態、オフ状態およびトリップ状態のうちの何れの状態であるかを判別できるから、表示部材１５の表示とハンドル１０の位置とをもとに接点部６の状態を判別する場合に比べて、接点部６の状態を誤判断する可能性を低減することができる。 As described above, in the present embodiment, the ON display portion 42b of the display member 15 and the OFF display are positioned at the position facing the display window 14 provided on the surface of the container 1 according to the ON operation, OFF operation, and trip operation of the contact portion 6. Any one of the part 42a and the trip display part 42c can be moved. That is, the portion of the display surface 42 exposed from the display window 14 is different in each of the three states of the contact portion 6 in the off state, the on state, and the trip state, and the display surface 42 exposed from the display window 14 in each state. By changing the colors and display contents (for example, characters) of the parts (on display part 42b, off display part 42a and trip display part 42c), the contact part 6 is turned off, on and tripped by one display member 15. Each status can be displayed. Accordingly, it is possible to determine which of the on state, the off state, and the trip state by simply looking at the display on the display member 15, so that the contact point is based on the display on the display member 15 and the position of the handle 10. Compared with the case where the state of the part 6 is determined, the possibility of erroneously determining the state of the contact part 6 can be reduced.

また図５は接点部６に過大電流が流れて溶着した状態を示しており、電磁釈放機構部１１又は熱動釈放機構部１２が過大電流を検知して第１押圧部３５又は第２押圧部３６を押圧することによって、ラッチ部材３０が反時計回りに回転し、爪片２８が支持部材２６の係合部２６ａから離れる方向へ移動する。このとき、ハンドル１０がハンドルばねのばね力によってオフ方向（図５中の反時計回り）へ回転するのであるが、可動接点８と固定接点７とが溶着しているので、可動接点アーム２２が開極方向へ移動することができず、そのため支持部材２６もオン時と同じ位置に停止するから、ストップバー３１の軸部がガイド溝１０ｃの左端に当接することによって、ハンドル１０がそれ以上オフ回転方向へ回転することができず、したがって操作摘み１０ａはオン位置とオフ位置との中間位置に直立した状態となるから、接点部６の溶着状態を容易に判別することができる。 FIG. 5 shows a state where an excessive current flows and welds to the contact portion 6, and the electromagnetic release mechanism 11 or the thermal release mechanism 12 detects the excessive current and detects the first pressing portion 35 or the second pressing portion. By pressing 36, the latch member 30 rotates counterclockwise, and the claw piece 28 moves in a direction away from the engaging portion 26 a of the support member 26. At this time, the handle 10 is rotated in the off direction (counterclockwise in FIG. 5) by the spring force of the handle spring. However, since the movable contact 8 and the fixed contact 7 are welded, the movable contact arm 22 is Since it cannot move in the opening direction, and the support member 26 also stops at the same position as when it is turned on, the handle 10 is further turned off when the shaft portion of the stop bar 31 abuts against the left end of the guide groove 10c. Since the operation knob 10a cannot be rotated in the rotation direction, and is in an upright position at an intermediate position between the on position and the off position, the welding state of the contact portion 6 can be easily determined.

尚、本実施形態の回路遮断器は、電磁釈放機構部１１と熱動釈放機構部１２の両方を備えているものであるが、いずれか一方のみを備えているものでもあってもよいし、各釈放機構部の構成は上記の構成に限定されるものではない。また負荷側端子部４Ａや電源側端子部４Ｂやリンク機構９も上記の構成に限定されるものではなく、状況に応じて好適なものを用いれば良い。 The circuit breaker of the present embodiment includes both the electromagnetic release mechanism unit 11 and the thermal release mechanism unit 12, but may include only one of them. The configuration of each release mechanism is not limited to the above configuration. Further, the load side terminal portion 4A, the power source side terminal portion 4B, and the link mechanism 9 are not limited to the above-described configuration, and a suitable one may be used depending on the situation.

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を幅方向の片側から見た図である。It is the figure which showed the OFF state of the circuit breaker of this embodiment, and looked at the state which removed the cover from the one side of the width direction. 同上のオフ状態を示し、カバーを外した状態の斜視図である。It is a perspective view of the state which showed the OFF state same as the above and removed the cover. 同上のオン状態を示し、カバーを外した状態を幅方向の片側から見た図である。It is the figure which showed the ON state same as the above and looked at the state which removed the cover from the one side of the width direction. 同上のトリップ直後の状態を示し、カバーを外した状態を幅方向の片側から見た図である。It is the figure which showed the state immediately after a trip same as the above, and looked at the state which removed the cover from the one side of the width direction. 同上の接点部が溶着した状態を示し、カバーを外した状態を幅方向の片側から見た図である。It is the figure which showed the state which the contact part same as the above welded, and looked at the state which removed the cover from the one side of the width direction. 同上を示し、（ａ）は正面図、（ｂ）は左側面図、（ｃ）は右側面図、（ｄ）は上面図である。The same as above, (a) is a front view, (b) is a left side view, (c) is a right side view, and (d) is a top view. 同上に用いる表示部材を示し、（ａ）は正面図、（ｂ）は上面図、（ｃ）は右側面図である。The display member used for the above is shown, (a) is a front view, (b) is a top view, and (c) is a right side view. 同上に用いる表示部材の外観斜視図である。It is an external appearance perspective view of the display member used for the same as the above. 同上に用いる表示部材の表示位置を示し、（ａ）はオフ状態、（ｂ）はオン状態、（ｃ）はトリップ状態の各表示位置を説明する要部断面図である。The display position of the display member used for the above is shown, (a) is an OFF state, (b) is an ON state, (c) is a principal part sectional view explaining each display position of a trip state.

Explanation of symbols

１器体
６接点部
７固定接点
８可動接点
９リンク機構
１０ハンドル
１０ａ操作摘み（操作部）
１１電磁釈放機構部（トリップ機構）
１２熱動釈放機構部（トリップ機構）
１４表示窓
１４ａオフ表示部
１４ｂオン表示部
１４ｃトリップ表示部
１５表示部材 DESCRIPTION OF SYMBOLS 1 Body 6 Contact part 7 Fixed contact 8 Movable contact 9 Link mechanism 10 Handle 10a Operation knob (operation part)
11 Electromagnetic release mechanism (trip mechanism)
12 Thermal release mechanism (trip mechanism)
14 display window 14a off display unit 14b on display unit 14c trip display unit 15 display member

Claims

A contact part provided with a fixed contact and a movable contact that comes in contact with and away from the fixed contact inside the container, and at least the operation part can be rotated with respect to the container with the operation part exposed to the outside. Handle that is supported by the handle, a link mechanism that moves the movable contact to and away from the fixed contact according to the turning movement of the handle, and a trip that forcibly opens the contact by driving the link mechanism when an abnormal current flowing in the electric circuit is detected A link comprising: a mechanism; an on display unit for displaying an on state of the contact unit; an off display unit for displaying an off state; and a trip display unit for displaying a trip state; The mechanism moves any of the ON display section, OFF display section, and trip display section to a position facing the display window provided on the surface of the container according to the ON operation, OFF operation, and trip operation of the contact section. Circuit breaker according to claim Rukoto.