JPH0322010B2

JPH0322010B2 -

Info

Publication number: JPH0322010B2
Application number: JP26432686A
Authority: JP
Inventors: Yoji Ooshima
Original assignee: Terasaki Electric Co Ltd
Current assignee: Terasaki Electric Co Ltd
Priority date: 1986-11-06
Filing date: 1986-11-06
Publication date: 1991-03-26
Also published as: JPS63119126A

Description

【発明の詳細な説明】［産業上の利用分野］この発明は回路遮断器の引き外し機構に関し、
特に開閉機構の釈放部の構造に関する。[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a circuit breaker tripping mechanism,
In particular, it relates to the structure of the release part of the opening/closing mechanism.

［従来の技術］一般に絶縁箱型回路遮断器において、大型の機
種になつてくると開閉機構の操作力の大きいもの
が要求され、必然的に開閉機構部が大型となる。
そのため、大型のトリツプレバーが１対で備えら
れてそれぞれの先端を単一のフツクに係合するよ
うにして、操作力の荷重を１対のトリツプレバー
に分担させるようにしたものが実施されている。
このようなこの発明の背景となる従来装置の一例
を示すもので、第８図は従来の回路遮断器の中央
部における側断面図、第９図は開路状態を示す開
閉機構の釈放部の斜視図である。[Prior Art] In general, as insulating box type circuit breakers become larger, the opening/closing mechanism is required to have a larger operating force, and the opening/closing mechanism inevitably becomes larger.
For this reason, a pair of large trip levers is provided, each tip of which is engaged with a single hook, so that the load of the operating force is shared between the pair of trip levers.
FIG. 8 is a side sectional view of the central part of a conventional circuit breaker, and FIG. 9 is a perspective view of the release part of the opening/closing mechanism showing the open circuit state. It is a diagram.

図において、成形絶縁物よりなるモールドベー
ス１とモールドカバー２によつて絶縁箱が形成さ
れ、その底部から電源側外部接続端子３が突出す
る。電源側外部接続端子３がモールドベース１の
内部で接続する電源側端子４は、固定側アーク接
触子６を備えたアークホーン５ならびに固定側主
接触子７を装着する。可動接触子杆１０は電源側
端子４に備えられた固定側アーク接触子６ならび
に固定側主接触子７に対応する位置に可動側アー
ク接触子８および可動側主接触子９を備え、軸１
１によりコンタクトホルダ１２に回動自在に支持
され、一端は可撓導体１３により接続子１４に連
結されている。また、接続子１４は主電流導体１
５および負荷側端子１６を介してモールドベース
１から外方に突出する負荷側外部接続端子１７に
電気的に接続される。コンタクトホルダ１２は固
定枠１８ａ，１８ｂ，ｃ内符号は対称側のものを
示す、以下同じ）に設けたコンタクトホルダ回動
軸１９に軸支され、固定側アーク接触子６および
固定側主接触子７と可動側アーク接触子８および
可動側主接触子９との良好な接触を保持するため
に可動接触子杆１０を押圧する圧縮ばね３３が内
蔵される。また、コンタクトホルダ１２は他極の
コンタクトホルダと連結する絶縁性の連動軸２０
で各極の可動側主接触子および可動側アーク接触
子は各極の連通されたコンタクトホルダ回動軸１
９を支点として開閉機構により全極同時に開路・
閉路位置へと操作される。開閉機構ならびに釈放
自在装置としてコンタクトホルダ１２の両側に下
側リンク２１ａ，２１ｂが一端を回動軸２２ａ，
２２ｂに、他端を共通のトグルリンク軸２３に連
結され、上側リンク２４ａ，２４ｂは一端をトグ
ルリンク軸２３に連結し、他端をトリツプレバー
２５ａ，２５ｂの中央位置にピン２６ａ，２６ｂ
により連結される。開閉レバー２９は両側下端を
固定枠１８ａ，１８ｂに設けた固定軸２７ａ，２
７ｂに回動自在に支承され、かつ上面に操作ハン
ドル２８が一体に装着される。複数の操作ばね３
０は開閉レバー２９の上端とトグルリンク軸２３
に嵌入された支持材３２との間に架設され、トグ
ルリンク開閉機構を形成し、トリツプレバー２５
ａ，２５ｂを常時反時計方向に強力に付勢してい
る。 In the figure, an insulating box is formed by a mold base 1 made of a molded insulator and a mold cover 2, and a power source side external connection terminal 3 protrudes from the bottom of the insulating box. The power supply side terminal 4 to which the power supply side external connection terminal 3 is connected inside the mold base 1 is equipped with an arc horn 5 having a fixed side arc contact 6 and a fixed side main contact 7 . The movable contact rod 10 has a movable arc contact 8 and a movable main contact 9 at positions corresponding to the fixed arc contact 6 and the fixed main contact 7 provided on the power supply terminal 4, and has a movable arc contact 8 and a movable main contact 9.
1 is rotatably supported by a contact holder 12 , and one end is connected to a connector 14 by a flexible conductor 13 . In addition, the connector 14 is connected to the main current conductor 1
5 and a load-side terminal 16 to a load-side external connection terminal 17 protruding outward from the mold base 1 . The contact holder 12 is pivotally supported by a contact holder rotation shaft 19 provided in a fixed frame 18a, 18b, and c (the numbers inside the symmetrical side indicate those on the symmetrical side, the same applies hereinafter), and the contact holder 12 is rotatably supported by a contact holder rotation shaft 19 provided in a fixed frame 18a, 18b, and c. A compression spring 33 is built in to press the movable contact rod 10 in order to maintain good contact between the movable arc contact 8 and the movable main contact 9. The contact holder 12 also has an insulating interlocking shaft 20 that connects with the contact holder of the other pole.
The movable main contact and movable arc contact of each pole are connected to the contact holder rotation axis 1 of each pole.
The opening/closing mechanism uses 9 as a fulcrum to simultaneously open and close all poles.
Operated to closed circuit position. Lower links 21a and 21b are provided on both sides of the contact holder 12 as an opening/closing mechanism and a freely releasing device, and one end is connected to a rotation shaft 22a,
22b, the other end is connected to a common toggle link shaft 23, and the upper links 24a, 24b have one end connected to the toggle link shaft 23, and the other end connected to the center position of the trip levers 25a, 25b with pins 26a, 26b.
connected by. The opening/closing lever 29 has fixed shafts 27a, 2 whose lower ends on both sides are provided on the fixed frames 18a, 18b.
7b, and an operating handle 28 is integrally attached to the upper surface thereof. Multiple operating springs 3
0 is the upper end of the opening/closing lever 29 and the toggle link shaft 23
The trip lever 25
a and 25b are always strongly biased counterclockwise.

釈放自在装置として、１対のトリツプレバー２
５ａ，２５ｂは一端をモールドベース１の側壁で
コンタクトホルダ１２の両側に対応型を形成する
よう定着された固定枠１８ａ，１８ｂの垂直面に
それぞれピン３１ａ，３１ｂによつて回動自在に
軸支され、トリツプレバー２５ａ，２５ｂの各々
の他端を単一の１次フツク５８の片側に係合す
る。回動軸５９にて軸支された１次フツク５８の
他端は、回動軸６３にて軸支された２次フツク６
１のローラ６２に係合され、また１次フツク５８
および２次フツク６１は、ばね６０にて反時計方
向に常時付勢されている。さらに、２次フツク６
１はその先端を回動軸６６に軸支されたトリツプ
バー６５の埋込爪６４に係合される。したがつ
て、トリツプレバー２５ａ，２５ｂの反時計方向
への回動力が１次フツク５８および２次フツク６
１に常時時計方向へ力を加え、その力はばね６０
の力より大なので、埋込爪６４と２次フツク６１
の係合が解かれることによつて２次フツク６１は
回動軸６３を中心に時計方向に回動する。さら
に、その回動につれて１次フツク５８を回動軸５
９を中心に時計方向に回動してトリツプレバー２
５ａ，２５ｂとの係合を解き、トリツプレバー２
５ａ，２５ｂをばね上げることによつて可動接触
子杆１０を持ち上げて自動開路する。 As a release device, a pair of trip levers 2
5a and 25b have one end rotatably supported by pins 31a and 31b on the vertical planes of fixed frames 18a and 18b, which are fixed to the side wall of the mold base 1 to form corresponding molds on both sides of the contact holder 12, respectively. and engages the other end of each of the trip levers 25a, 25b with one side of the single primary hook 58. The other end of the primary hook 58 which is supported by a rotation shaft 59 is connected to the secondary hook 6 which is supported by a rotation shaft 63.
1 roller 62, and the primary hook 58
The secondary hook 61 is constantly biased counterclockwise by a spring 60. Furthermore, the secondary hook 6
1 is engaged with an embedded pawl 64 of a trip bar 65 whose tip end is pivotally supported by a rotation shaft 66. Therefore, the rotation force of the trip levers 25a, 25b in the counterclockwise direction is applied to the primary hook 58 and the secondary hook 6.
1 is constantly applied clockwise, and the force is applied to the spring 60.
Since the force is greater than the force of , the embedded claw 64 and the secondary hook 61
By disengaging the secondary hook 61, the secondary hook 61 rotates clockwise about the rotation shaft 63. Furthermore, as the rotation occurs, the primary hook 58 is moved to the rotation axis 5.
Rotate clockwise around 9 to release the trip lever 2.
5a, 25b, and release the trip lever 2.
By springing up 5a and 25b, the movable contact rod 10 is lifted and the circuit is automatically opened.

過電流応動装置を収納するトリツプユニツトケ
ース７４の下部には主電流導体１５を囲うように
設置された変流器鉄心７０および瞬時引き外しの
電磁石を構成するＵ字型固定鉄心７２を備え、バ
イメタル６７は変流器鉄心７０の短絡２次巻線６
９に固着される。トリツプユニツトケース７４の
内部には成形絶縁物よりなるトリツプバー６５が
回動軸６６に軸支され、埋込爪６４および可動鉄
片７１の動作に対応する瞬時引き外し受け片６８
がトリツプバー６５にそれぞれ１体に装着され、
バイメタル６７および可動鉄片７１の動作に応じ
てトリツプバー６５を回動するようにそれぞれ係
合するものである。モールドカバー２の前面より
外部に面した調整つまみ７３によつてＵ字型固定
鉄心７２と可動鉄片７１の隙間を変化させて作動
電流値の調整を外部より行なうことができる。 The lower part of the trip unit case 74 housing the overcurrent response device includes a current transformer core 70 installed to surround the main current conductor 15 and a U-shaped fixed core 72 constituting an instantaneous tripping electromagnet. The bimetal 67 is the short-circuited secondary winding 6 of the current transformer core 70
Fixed to 9. Inside the trip unit case 74, a trip bar 65 made of a molded insulator is pivotally supported on a rotating shaft 66, and an instantaneous trip receiving piece 68 corresponding to the movement of the embedded claw 64 and the movable iron piece 71 is provided.
are attached to each trip bar 65,
The bimetal 67 and the movable iron piece 71 are engaged to rotate the trip bar 65 in accordance with the movements of the bimetal 67 and the movable iron piece 71, respectively. The operating current value can be adjusted from the outside by changing the gap between the U-shaped fixed iron core 72 and the movable iron piece 71 using an adjustment knob 73 facing outside from the front surface of the mold cover 2.

過電流応動装置の動作としては、通常の過負荷
時においてはバイメタル６７の作動によつてトリ
ツプバー６５が回動し、短絡時においては可動鉄
片７１の作動によつてトリツプバー６５が回動し
て、いずれも２次フツク６１と埋込爪６４の係合
を解くが、２次フツク６１の回動以下の回路引き
外し機構の動作は同様である。 As for the operation of the overcurrent response device, during a normal overload, the trip bar 65 rotates due to the operation of the bimetal 67, and during a short circuit, the trip bar 65 rotates due to the operation of the movable iron piece 71. In both cases, the engagement between the secondary hook 61 and the embedded claw 64 is released, but the operation of the circuit tripping mechanism after the rotation of the secondary hook 61 is the same.

［発明が解決しようとする問題点］上記のような従来の大型の回路遮断器の引き外
し機構では、トリツプレバー２５ａ，２５ｂの大
きな引き外し機構を低減するためにトリツプバー
６５との間に１次フツク５８および２次フツク６
１を設置している。この引き外し荷重の低減の効
果は１次フツク５８および２次フツク６１のレバ
ー比に基づくものであるので、レバー比の大きい
フツクの設置スペースの確保のため回路遮断器が
大型化するという問題点があつた。[Problems to be Solved by the Invention] In the conventional large circuit breaker tripping mechanism as described above, a primary hook is provided between the trip levers 25a and 25b to reduce the large tripping mechanism of the trip levers 25a and 25b. 58 and secondary hook 6
1 is installed. Since this effect of reducing the tripping load is based on the lever ratio of the primary hook 58 and the secondary hook 61, there is a problem that the circuit breaker becomes larger in order to secure installation space for the hook with a large lever ratio. It was hot.

さらに、操作力の荷重を１対のトリツプレバー
２５ａ，２５ｂに分担させる構造であるため操作
ハンドル２８の操作により、トリツプレバー２５
ａ，２５ｂと１次フツク５８とを係合させるリセ
ツト操作において部品誤差ならびに組立誤差によ
つて１対のトリツプレバー２５ａ，２５ｂのう
ち、いずれか一方のトリツプレバーが１次フツク
５８と係合し、他方のトリツプレバーが１次フツ
ク５８と係合していない状態が生じる場合があ
る。この場合、片側のトリツプレバーは１次フツ
ク５８と係合して回転しないが他方のトリツプレ
バーは回転するため１対のトリツプレバー２５
ａ，２５ｂに接続されているトグル機構部が強力
な操作ばね３０の力でねじられて破損に至るとい
う問題点があつた。 Furthermore, since the structure is such that the load of the operating force is shared between the pair of trip levers 25a and 25b, the operation of the operating handle 28 causes the trip lever 25
a, 25b and the primary hook 58, one of the pair of trip levers 25a, 25b engages with the primary hook 58 due to component errors and assembly errors, and the other one engages with the primary hook 58. There may be a situation where the trip lever is not engaged with the primary hook 58. In this case, one trip lever engages with the primary hook 58 and does not rotate, but the other trip lever rotates, so the pair of trip levers 25
There was a problem in that the toggle mechanism connected to the terminals a and 25b was twisted by the force of the strong operation spring 30, leading to damage.

この発明はかかる問題点を解決するためになさ
れたもので引き外し荷重を低減する機構を小形に
し、かつ、リセツト操作時における１対のトリツ
プレバーのいずれか一方のトリツプレバーのみの
係止によりトグル機構の破損を防止する引き外し
機構を提供することを目的とするものである。 This invention was made to solve these problems, and it is possible to downsize the mechanism for reducing the tripping load, and to prevent the toggle mechanism from locking only one of the pair of trip levers during the reset operation. The purpose is to provide a tripping mechanism that prevents damage.

［問題点を解決するための手段］この発明に係る回路遮断器の引き外し機構は１
対のトリツプレバー引き外し検出応動装置の作動
部材との間に以下の引き外し機構を設けたもので
ある。[Means for Solving the Problems] The circuit breaker tripping mechanism according to the present invention has the following features:
The following tripping mechanism is provided between the actuating member of the paired trip lever tripping detection response device.

コの字形状を有し、かつ上下辺面に挿通穴を設
けた固定枠の一辺の辺面に開口側から１対のトリ
ツプレバーの先端に対応するように分割配置され
た１対の第１の軸と、第２の軸および第３の軸を
設置し、第２軸と第３軸との間に爪部を有する引
き外しフツク板を上下辺面の挿通穴を貫通させて
設置する。１対の第１軸は第２軸の径より小さ
く、かつ、１対のトリツプレバーの回動を阻止
し、第２軸は１対の第１の軸の各々と対応する位
置に固定されている、引き外しフツク板の１対の
突出係止片に支持されており、第３軸は回動自在
であるが移動は固定枠内に設置されるガイドで阻
止される。また、引き外しフツク板は固定枠の外
で引き外し検出応動装置の作動杆の作用力を受け
た場合傾斜するように第２軸および第３軸で支持
され、下辺面の挿通穴は引き外しフツク板が傾斜
した際、その爪部を固定枠の外方へ移動し得る大
きさとする。 A pair of first levers are arranged on one side of the fixed frame, which has a U-shape and has insertion holes on the upper and lower sides, so as to correspond to the tips of the pair of trip levers from the opening side. A shaft, a second shaft, and a third shaft are installed, and a removable hook plate having a claw portion is installed between the second shaft and the third shaft by passing through the insertion hole in the upper and lower sides. The diameter of the pair of first shafts is smaller than that of the second shaft, and prevents rotation of the pair of trip levers, and the second shaft is fixed at a position corresponding to each of the pair of first shafts. , is supported by a pair of protruding locking pieces of the detachable hook plate, and the third shaft is rotatable, but movement is prevented by a guide installed within the fixed frame. In addition, the tripping hook plate is supported by the second and third shafts so as to be tilted when receiving the action force of the operating rod of the tripping detection response device outside the fixed frame, and the insertion hole on the lower side is When the hook plate is tilted, the hook part is made large enough to move outside the fixed frame.

［作用］１対の第１軸は第２の軸の径より小さいので１
対のトリツプレバーの回動力が１対の第１軸を介
して第２軸の下方向の分力を常時発生させてお
り、また引き外し作動杆の作用力による引き外し
フツク板の傾斜は、第２軸および第３軸に挟まれ
て抵抗が拡がり摩擦だけなので作動杆の小さな力
によつて確実になされ、引き外しフツク板の爪部
を固定枠の下辺面の挿通穴から引き外しフツク板
とともに押し出すことにより、突出係止片が移動
して第２軸および第１軸が移動し１対のトリツプ
レバーの回動阻止が解除される。また、リセツト
操作時において１対のトリツプレバーの片方が第
１軸に係合していない場合は引き外しフツク板を
傾斜させるので、他方のトリツプレバーの回動力
が上述のごとく引き外しフツク板を下方に移動さ
せて他方のトリツプレバーの係合も外れさせ、１
対のトリツプレバーがはね上がるトリツプ状態と
なるので、トリツプレバーの片側係合による従来
のようなトグル機構の破損を生じない。[Effect] Since the diameter of the first shaft of the pair is smaller than that of the second shaft, 1
The rotational force of the pair of trip levers constantly generates a downward force on the second shaft through the pair of first shafts, and the tilting of the tripping hook plate due to the force acting on the tripping lever is Being sandwiched between the 2nd and 3rd shafts, the resistance spreads and there is only friction, so a small force from the operating rod is used to reliably remove the hook part of the hook plate from the insertion hole on the lower side of the fixed frame. By pushing out, the protruding locking piece moves, the second shaft and the first shaft move, and the rotation prevention of the pair of trip levers is released. Additionally, if one of the pair of trip levers is not engaged with the first shaft during the reset operation, the tripping hook plate is tilted, so that the rotational force of the other trip lever causes the tripping lever to move downward as described above. Move it to disengage the other trip lever, and
Since the pair of trip levers springs up into a trip state, the toggle mechanism is not damaged as in the conventional case due to one-sided engagement of the trip levers.

［発明の実施例］第１図はこの発明の一実施例を示す正常電流時
における回路遮断器の中央部における側断面図で
ある。第２図はこの要部分解斜視図である。[Embodiment of the Invention] FIG. 1 is a side cross-sectional view of the central portion of a circuit breaker during normal current, showing an embodiment of the invention. FIG. 2 is an exploded perspective view of this main part.

両図において、符号１〜３３は従来装置と同様
である。トリツプレバー２５ａ，２５ｂの先端部
にこの発明の引き外し機構が設置されている。ト
リツプケースユニツト４５内には、たとえば過電
流応動装置または電子式の過電流継電器等の引き
外し検出応動装置が内蔵されてこれと連動される
検出応動部材の作動杆４４が設置される。引き外
し機構はコの字型の固定枠３４の上辺面５５には
中央に矩形の挿通穴４６、両端部に矩形の挿通穴
４７ａ，４７ｂおよび１対のトリツプレバー２５
ａ，２５ｂの回動を阻止しない切欠５０ａ，５０
ｂが両端部に設けられ、下辺面５６には中央にほ
ぼ矩形の挿通穴４８と両端部に切欠４９ａ，４９
ｂが設けられている。フツク板は中央部において
爪部４１を有した引き外しフツク板３８とその両
側に設置された、突出係止片３９ａ，３９ｂを有
した支持板５２ａ，５２ｂとが連結材５４ａ，５
４ｂにて一体とされて構成される。引き外しフツ
ク板３８の上下部分がそれぞれ挿通穴４６および
挿通穴４８を貫通し、爪部４１は挿通穴４８の周
縁の下辺面５６に正常電流時は接している。支持
板５２ａ，５２ｂの上下部分がそれぞれ挿通穴４
７ａ，４７ｂおよび切欠４９ａ，４９ｂを挿通
し、その下端部と固定枠３４の下辺面５６のばね
取付部５３ａ，５３ｂとの間に復帰ばね４２ａ，
４２ｂが架設される。固定枠３４の上辺面５５の
下に１対のトリツプレバー２５ａ，２５ｂの側か
ら順に、各々トリツプレバー２５ａ，２５ｂと対
応するよう分割配置された１対の第１軸３５ａ，
３５ｂ、第２軸３６および第３軸３７が設置さ
れ、第２軸３６と第３軸３７との間に引き外しフ
ツク板３８および支持板５２ａ，５２ｂを挟み、
固定ガイド５１が固定枠３４の上辺面５５と下辺
面５６との間に設置される。１対の第１軸３５
ａ，３５ｂ、第２軸３６および第３軸３７は固定
枠３４の上辺面５５と固定ガイド５１を支持部４
０ａ，４０ｂおよび突出係止片３９ａ，３９ｂと
の空間において各々回動自在に設置される。各部
材を設置した固定枠３４は開口側面を閉塞する支
持枠４３ａ，４３ｂに支持される。また、引き外
しフツク板３８の上部に対応して、たとえばトリ
ツプケースユニツト４５に内蔵される検出応動装
置に連動される作動杆４４が設置される。 In both figures, numerals 1 to 33 are the same as those in the conventional device. The trip mechanism of the present invention is installed at the tip of the trip levers 25a, 25b. Inside the trip case unit 45, a trip detection response device such as an overcurrent response device or an electronic overcurrent relay is built in, and an operating rod 44 of a detection response member is installed in conjunction with the trip detection response device. The removal mechanism has a rectangular insertion hole 46 in the center of the upper side 55 of the U-shaped fixed frame 34, rectangular insertion holes 47a and 47b at both ends, and a pair of trip levers 25.
Notches 50a, 50 that do not prevent rotation of a, 25b
b are provided at both ends, and the lower side surface 56 has a substantially rectangular insertion hole 48 at the center and notches 49a, 49 at both ends.
b is provided. The hook plate includes a detachable hook plate 38 having a claw portion 41 in the center and support plates 52a and 52b having protruding locking pieces 39a and 39b installed on both sides thereof, and connecting members 54a and 5.
4b. The upper and lower portions of the detachable hook plate 38 pass through the insertion hole 46 and the insertion hole 48, respectively, and the claw portion 41 is in contact with the lower side surface 56 of the periphery of the insertion hole 48 during normal current. The upper and lower parts of the support plates 52a and 52b are respectively inserted into the insertion holes 4.
7a, 47b and notches 49a, 49b, and the return spring 42a is inserted between the lower end thereof and the spring attachment portions 53a, 53b of the lower side surface 56 of the fixed frame 34,
42b is constructed. A pair of first shafts 35a are divided and arranged under the upper side surface 55 of the fixed frame 34 in order from the side of the pair of trip levers 25a, 25b so as to correspond to the trip levers 25a, 25b, respectively.
35b, a second shaft 36 and a third shaft 37 are installed, and a detachable hook plate 38 and support plates 52a, 52b are sandwiched between the second shaft 36 and third shaft 37,
A fixed guide 51 is installed between an upper side surface 55 and a lower side surface 56 of the fixed frame 34. A pair of first shafts 35
a, 35b, the second shaft 36, and the third shaft 37 connect the upper side surface 55 of the fixed frame 34 and the fixed guide 51 to the support part 4.
0a, 40b and the protruding locking pieces 39a, 39b, each of which is rotatably installed. The fixed frame 34 on which each member is installed is supported by support frames 43a and 43b that close the opening side. Further, an operating rod 44 is installed corresponding to the upper part of the tripping hook plate 38, and is interlocked with a detection and response device built into the trip case unit 45, for example.

第３図はこの発明の作動説明図である。 FIG. 3 is an explanatory diagram of the operation of this invention.

図を参照してトリツプレバー２５ａ側の作用原
理を説明するが、トリツプレバー２５ｂ側の作用
も全く同一である。また便宜上爪部４１を有する
引き外しフツク板３８は本図に記載していない
が、第２図で示すごとく爪部４１の移動は支持板
５２ａと一体となつて行なわれる。 The principle of operation on the trip lever 25a side will be explained with reference to the drawing, but the operation on the trip lever 25b side is also exactly the same. Although the detachable hook plate 38 having the claw portion 41 is not shown in this figure for convenience, the movement of the claw portion 41 is performed integrally with the support plate 52a as shown in FIG.

第１軸３５ａと第２軸３６の軸心を結ぶ中心軸
は第１軸３５ａの径が第２軸３６の径より小さい
ため、固定枠３４の上辺面５５に対し傾き角度θ
を持つので、第１軸３５ａに加わるトリツプレバ
ー２５ａの作用力Ｇの第１軸３５ａと第２軸３６
の軸心とを結ぶ中心軸方向の分力G₁が第２軸３
６に伝達力Ｆとなつて加わり、第２軸３６におい
て下方向への垂直分力F₁を発生する。この垂直
分力F₁が引き外しフツク板（図示せず）に固定
されている爪部４１に伝達され正常電流時には常
に爪部４１は固定枠３４の下辺面５６に垂直分力
F₁を加える（第３図ａ参照）。一方、引き外しフ
ツク板の上端は第１図に示すようにトリツプユニ
ツトケース４５の作動杆４４に対応して設けられ
ており、引き外し時にはこの作動杆４４によつて
引き外しフツク板を矢印方向（本図では便宜上支
持板５２ａを傾斜している）に傾斜するように力
を加えるが、引き外しフツク板および支持板５２
ａは第２軸３６および第３軸３７に挟まれてお
り、この両軸が回転することによつて容易に傾斜
する（第３図ｂ参照）。 Since the diameter of the first shaft 35a is smaller than the diameter of the second shaft 36, the central axis connecting the axes of the first shaft 35a and the second shaft 36 is inclined at an angle θ with respect to the upper side surface 55 of the fixed frame 34.
Therefore, the acting force G of the trip lever 25a applied to the first shaft 35a is caused by the first shaft 35a and the second shaft 36
The component force G ₁ in the direction of the central axis connecting with the axis of the second axis 3
6 as a transmitted force F, and generates a downward vertical component force F ₁ at the second shaft 36 . This vertical component F ₁ is transmitted to the claw portion 41 fixed to the tripping hook plate (not shown), and the claw portion 41 always applies a vertical component force to the lower side surface 56 of the fixed frame 34 during normal current.
Add F ₁ (see Figure 3a). On the other hand, the upper end of the tripping hook plate is provided corresponding to the operating rod 44 of the trip unit case 45, as shown in FIG. Although a force is applied so as to tilt the support plate 52a in the direction (in this figure, the support plate 52a is tilted for convenience), the detachment hook plate and the support plate 52
A is sandwiched between a second shaft 36 and a third shaft 37, and is easily tilted by rotation of both shafts (see FIG. 3B).

垂直分力F₁は作用力Ｇに比して大きく低減さ
れているので、爪部４１と下辺面５６との接触抵
抗は少なく引き外しフツク板の傾斜によつて爪部
４１も容易に傾き、固定枠３４の下辺面５６との
接触が解除される。傾いた爪部４１は挿通穴４８
に面するがこの状態においても上述の垂直分力
F₁が下向きに加わつているので引き外しフツク
板は爪部４１と共に、さらに支持板５２ａは突出
係止片３９ａと共に第２軸３６および第３軸３７
の回転の効果で急速に固定枠３４の下方に移動す
る。また、下方への移動が大きい場合には支持板
５２ａの突出係止片３９ａが固定枠３４の下辺面
５６と係合することにより抜け止めとなる。 Since the vertical component F ₁ is greatly reduced compared to the acting force G, the contact resistance between the claw portion 41 and the lower side surface 56 is small, and the claw portion 41 is easily tilted by the inclination of the tripping hook plate. The contact with the lower side surface 56 of the fixed frame 34 is released. The inclined claw part 41 is the insertion hole 48
However, even in this state, the vertical component force mentioned above
Since F ₁ is applied downward, the detachment hook plate is connected to the claw portion 41, and the support plate 52a is connected to the second shaft 36 and the third shaft 37 together with the protruding locking piece 39a.
It moves rapidly below the fixed frame 34 due to the rotation effect. Further, when the downward movement is large, the protruding locking piece 39a of the support plate 52a engages with the lower side surface 56 of the fixed frame 34, thereby preventing it from coming off.

第４図はこの発明の一実施例におけるトリツプ
過程を順次示した図である。本図においてもトリ
ツプレバー２５ａ側について示しているが、トリ
ツプレバー２５ｂ側についても全く同様である。
また、図における符号は第１図および第２図に示
すものと同じである。 FIG. 4 is a diagram sequentially showing the tripping process in an embodiment of the present invention. This figure also shows the trip lever 25a side, but the same applies to the trip lever 25b side.
Further, the reference numerals in the figures are the same as those shown in FIGS. 1 and 2.

第４図ａはトリツプ過程へ入る前の正常電流状
態での引き外し機構を示す。第４図ｂは過電流時
の状況でトリツプケースユニツト４５の作動杆４
４が働き、引き外しフツク板３８を傾斜させた状
態を示す。上記第３図で示した作動原理によつて
引き外しフツク板３８および支持板５２ａは爪部
４１および突出係止片３９ａとともに固定枠３４
の下方に移動する。このため固定枠３４の上辺面
５５と突出係止片３９との間で支持されていた第
２軸３６が下方へ移動するので、その第２軸３６
のもとの位置に第１軸３５ａが移動し、そのため
トリツプレバー２５ａとの係合が外れ、トリツプ
レバー２５ａが反時計方向に回動して開閉機構が
崩壊されて回路遮断器が開路する、トリツプ瞬時
の状態である。 FIG. 4a shows the tripping mechanism under normal current conditions before entering the tripping process. Figure 4b shows the operating rod 4 of the trip case unit 45 in the overcurrent situation.
4 is activated and the removable hook plate 38 is tilted. According to the operating principle shown in FIG.
Move downwards. Therefore, the second shaft 36 supported between the upper side surface 55 of the fixed frame 34 and the protruding locking piece 39 moves downward, so that the second shaft 36
The first shaft 35a moves to its original position, thereby disengaging from the trip lever 25a, causing the trip lever 25a to rotate counterclockwise, collapsing the opening/closing mechanism and opening the circuit breaker. It is in a state of

第４図ｃはトリツプ瞬時に引き続き起こるトリ
ツプ状態を示す。 FIG. 4c shows a trip condition that occurs following a trip instant.

支持板５２ａは突出係止片３９ａとともに復帰
ばね４２ａにより引き上げられ、同時に支持板５
２ａと一体となつた引き外しフツク板３８が爪部
４１とともに引き上げられる。引き上げられた突
出係止片３９ａは第１軸３５ａおよび第２軸３６
を押し上げて直立状態となり、爪部３９ａは第４
図ａと同じく固定枠３４の下辺面５６と係合した
状態に復帰する。 The support plate 52a is pulled up together with the protruding locking piece 39a by the return spring 42a, and at the same time the support plate 5
The removable hook plate 38 integrated with 2a is pulled up together with the claw portion 41. The raised protruding locking piece 39a is attached to the first shaft 35a and the second shaft 36.
is pushed up to stand upright, and the claw portion 39a is in the fourth position.
It returns to the state in which it engages with the lower side surface 56 of the fixed frame 34 as in Figure a.

第４図ｄは回路遮断器を再閉路する際に操作ハ
ンドル２８をトリツプ位置からオフ位置へリセツ
ト操作、すなわちトリツプレバー２５ａが時計方
向に回動された状態を示す。トリツプレバー２５
ａの先端が第１軸３５ａを固定ガイド５１のガイ
ド部５７ａに沿つて押し下げ、第１軸３５ａを介
して突出係止片３９ａを押圧することより引き外
しフツク板３８を爪部４１と共に傾斜させる。し
たがつて、爪部４１と固定枠３４の下辺面５６と
の係合が解除され、第４図ｂと同じく引き外しフ
ツク板３８は爪部４１と共に、支持板５２ａは突
出係止片３９ａと共に固定枠３４の下方へ移動し
て第１軸３５ａを移動させることによつてトリツ
プレバー２５ａが第１軸３５ａの位置を通過す
る。 FIG. 4d shows a state in which the operating handle 28 is reset from the trip position to the off position when re-closing the circuit breaker, that is, the trip lever 25a is rotated clockwise. Tritup Lever 25
The tip of a pushes down the first shaft 35a along the guide portion 57a of the fixed guide 51, and presses the protruding locking piece 39a via the first shaft 35a, thereby tilting the detachable hook plate 38 together with the claw portion 41. . Accordingly, the engagement between the claw portion 41 and the lower side surface 56 of the fixed frame 34 is released, and as in FIG. By moving the fixed frame 34 downward and moving the first shaft 35a, the trip lever 25a passes the position of the first shaft 35a.

第４図ｅはリセツト状態へ復帰する直前の状態
を示す。トリツプレバー２５ａが下方向へ通過し
た後、引き外しフツク板３８が爪部４１と共に、
支持板５２ａが突出係止片３９ａと共に復帰ばね
４２ａによつて引き上げられ直立状態に復帰し、
第１軸３５ａを固定ガイド板５１のガイド部５７
ａに沿つて押し上げる。トリツプレバー２５ａは
下方位置から開閉機構の操作ばね３０の作用によ
る付勢力によつて反時計方向に回動し、第１軸３
５ａを押し上げて第４図(a)の状態に復帰し、リセ
ツト状態が完了となる。 FIG. 4e shows the state immediately before returning to the reset state. After the trip lever 25a passes downward, the tripping hook plate 38 and the claw portion 41
The support plate 52a is pulled up together with the protruding locking piece 39a by the return spring 42a and returned to the upright state,
Guide portion 57 of guide plate 51 fixing first shaft 35a
Push up along a. The trip lever 25a is rotated counterclockwise from the lower position by the biasing force exerted by the operation spring 30 of the opening/closing mechanism.
5a to return to the state shown in FIG. 4(a), and the reset state is completed.

第５図はリセツト時において片側のトリツプレ
バーのみが第１軸に係合するときの状態を示した
平面図であり、第６図はこの−断面図、第７
図はこの−断面図である。 FIG. 5 is a plan view showing a state in which only one trip lever engages with the first shaft during reset, and FIG. 6 is a cross-sectional view of this, and FIG.
The figure is a sectional view of this.

各図とも図中の符号は第２図と同様である。ま
た、第６図においては便宜上引き外しフツク板３
８を記載していない。 The symbols in each figure are the same as in FIG. 2. In addition, in FIG. 6, the removable hook plate 3 is shown for convenience.
8 is not listed.

第５図〜第７図をもとに、この発明のリセツト
時におけるトグル機構の破損防止機能について以
下、説明する。 The damage prevention function of the toggle mechanism during resetting according to the present invention will be explained below based on FIGS. 5 to 7.

引き外し機構部の部品誤差または組立誤差もし
くはリセツト時における操作ハンドル移動不足等
で本図のような状態、すなわち、トリツプレバー
２５ｂは第１軸３５ｂと係合しているがトリツプ
レバー２５ａは第１軸３５ａと係合していない状
態が予想される。このときトリツプレバー２５ａ
はリセツト時のその回動は時計方向となるので第
６図のごとくなり、第１軸３５ａを押し下げるこ
とにより突出係止片３９ａを介して支持板５２ａ
を傾斜させる。一方、トリツプレバー２５ｂは正
しく第１軸３５ｂに係合しているため、第３図で
示したごとくトリツプレバー２５ｂの回動力が、
第１軸３５ｂ→第２軸３６→突出係止片３９ｂ→
支持板５２ｂ→引き外しフツク板３８→爪部４１
に伝達され、爪部４１に下方と垂直分力を与え
る。ところが、トリツプレバー２５ａによつて傾
斜させられた支持板５２ａは引き外しフツク板３
８および支持板５２ｂも一体に傾斜させるので、
この状態はトリツプレバー２５ｂにとつては第４
図ｂにおけるトリツプケースユニツト４５の作動
杆４４が動作したのと同じことになる。したがつ
て、第４図ｃのごとくトリツプレバー２５ｂと第
１軸３５ｂとの係合が外れてしまい、またトリツ
プレバー２５ａは同じく第１軸３５ａと係合して
いないので、トリツプレバー２５ａおよびトリツ
プレバー２５ｂは操作ばね３０によつてはね上げ
られる。 Due to component errors or assembly errors in the tripping mechanism, or insufficient movement of the operating handle during reset, etc., the trip lever 25b is engaged with the first shaft 35b, but the trip lever 25a is not engaged with the first shaft 35a. It is expected that the device will not be engaged with the device. At this time, the trip lever 25a
The rotation at the time of reset is clockwise, as shown in FIG.
Tilt. On the other hand, since the trip lever 25b is correctly engaged with the first shaft 35b, the rotational force of the trip lever 25b is
First shaft 35b → second shaft 36 → protruding locking piece 39b →
Support plate 52b→removal hook plate 38→claw portion 41
is transmitted to give a downward and vertical component force to the claw portion 41. However, the support plate 52a tilted by the trip lever 25a is
8 and the support plate 52b are also tilted together,
This state is the fourth state for the trip lever 25b.
This is the same operation as the operating lever 44 of the trip case unit 45 in FIG. b. Therefore, the engagement between the trip lever 25b and the first shaft 35b is disengaged as shown in FIG. It is sprung up by a spring 30.

すなわち、この作用がこの発明においては片側
のトリツプレバーの係合のみで静止する状態はあ
り得ないことを意味し、したがつて、従来装置で
問題とされるトリツプレバーの片側係合によるト
グル機構の破損を生じることはないのである。 In other words, this action means that in the present invention, it is impossible for the trip lever to remain stationary with only one side of the trip lever being engaged, and therefore, damage to the toggle mechanism due to one-sided engagement of the trip lever, which is a problem with conventional devices, is impossible. will not occur.

なお、上記実施例における第１軸３５ａ，３５
ｂと第２軸３６の中心を結ぶ中心線と水平面との
なす角度は0.5°〜20°の範囲内で支障なく動作する
が、2°〜5°の範囲に設定することが好ましい。 Note that the first shafts 35a, 35 in the above embodiment
The angle between the center line connecting b and the center of the second shaft 36 and the horizontal plane can operate without problems within the range of 0.5° to 20°, but is preferably set within the range of 2° to 5°.

また、上記実施例においては第２軸および第３
軸はそれぞれ１本の軸としているが第１軸と同じ
ように分離・独立した軸としても同様の効果を奏
する。 In addition, in the above embodiment, the second axis and the third axis
Although each shaft is a single shaft, the same effect can be obtained even if the shafts are separated and independent in the same way as the first shaft.

さらに、上記実施例においては爪部４１は支持
板５２ａ，５２ｂに連結された引き外しフツク板
３８に設置しているが爪部はこの引き外し機構の
作動原理を満足すればよく、爪部の数量および設
置位置にはこだわらない。 Further, in the above embodiment, the claw portion 41 is installed on the tripping hook plate 38 connected to the support plates 52a and 52b, but the claw portion only needs to satisfy the operating principle of this tripping mechanism. There are no restrictions on quantity or installation location.

［発明の効果］この発明は以上説明したとおり、１対のトリツ
プレバーとトリツプケースユニツトの作動杆との
間に引き外し機構を１対の軸と２本の軸とをもと
に構成したので、小型で信頼のおける引き外し機
構となる効果がある。[Effects of the Invention] As explained above, in this invention, the tripping mechanism is constructed based on a pair of shafts and two shafts between a pair of trip levers and an operating rod of a trip case unit. This has the effect of providing a small and reliable tripping mechanism.

また、リセツト時においてトリツプレバーの片
側係合によるトグル機構の破損を生じることはな
いので、引き外し機構部の部品誤差や組立誤差に
対して従来装置に比べ許容範囲が拡大するので生
産性の向上に寄与し、さらにトリツプレバーの両
側係合が常時確実になされるので信頼のおけるリ
セツト動作となる効果がある。 In addition, since the toggle mechanism will not be damaged due to one-sided engagement of the trip lever during reset, the tolerance range for component errors and assembly errors in the tripping mechanism is expanded compared to conventional devices, which improves productivity. Furthermore, since both sides of the trip lever are always engaged reliably, a reliable reset operation is achieved.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はこの発明の一実施例を示す断面図、第
２図はこの要部分解斜視図、第３図はこの発明の
作動説明図、第４図はトリツプ過程図、第５図は
この発明の不完全リセツト時の平面図、第６図は
第５図の−断面図、第７図は第５図の−
断面図、第８図は従来の回路遮断器の中央部にお
ける側断面図、第９図は従来の開閉機構の釈放部
の開路状態を示す斜視図である。図において、２５ａ，２５ｂはトリツプレバ
ー、３４は固定枠、３５ａ，３５ｂは第１軸、３
６は第２軸、３７は第３軸、３８は引き外しフツ
ク板、３９ａ，３９ｂは突出係止片、４１は爪
部、４２ａ，４２ｂは復帰ばね、４４は作動杆、
４５はトリツプケースユニツト、４６は挿通穴、
４７ａ，４７ｂは挿通穴、４８は挿通穴、４９
ａ，４９ｂは切欠、５０ａ，５０ｂは切欠、５１
は固定ガイド、５２ａ，５２ｂは支持板、５５は
上辺面、５６は下辺面、５７ａ，５７ｂはガイド
部である。なお、各図中同一符号は同一または相
当部分を示す。 Fig. 1 is a sectional view showing one embodiment of the present invention, Fig. 2 is an exploded perspective view of the main parts, Fig. 3 is an explanatory diagram of the operation of the invention, Fig. 4 is a trip process diagram, and Fig. 5 is a diagram of the tripping process. A plan view of the invention at the time of incomplete reset, FIG. 6 is a cross-sectional view of FIG. 5, and FIG. 7 is a cross-sectional view of FIG. 5.
8 is a side sectional view of the central part of a conventional circuit breaker, and FIG. 9 is a perspective view showing the open state of the release part of the conventional opening/closing mechanism. In the figure, 25a and 25b are triple levers, 34 is a fixed frame, 35a and 35b are first shafts, and 3
6 is a second shaft, 37 is a third shaft, 38 is a removable hook plate, 39a, 39b are protruding locking pieces, 41 is a claw portion, 42a, 42b are return springs, 44 is an operating rod,
45 is a trip case unit, 46 is an insertion hole,
47a, 47b are insertion holes, 48 is an insertion hole, 49
a, 49b are notches, 50a, 50b are notches, 51
52a and 52b are support plates, 55 is an upper side surface, 56 is a lower side surface, and 57a and 57b are guide portions. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims

【特許請求の範囲】１回路遮断器の引き外し機構であつて、回路開閉機構に接続され、回動自在に常時付勢
された１対のトリツプレバーと、前記１対のトリツプレバーに係合してその回動
を阻止する独立に配置された移動自在の１対の第
１の軸と、前記１対の第１の軸の各々に接してその移動を
阻止する移動自在の第２の軸と、前記１対の第１の軸と前記第２の軸とが接する
部分に対応して、前記第２の軸を受ける１対の突
出係止片を有した移動自在のフツク板と、前記１対の第１の軸と、前記第２の軸と、前記
フツク板とを、前記１対の第１の軸が前記１対の
トリツプレバーの各々の回動を阻止し、前記第２
の軸が前記１対の第１の軸の移動を阻止し、さら
に前記フツク板が前記１対の突出係止片を介して
前記第２の軸の移動を阻止しつつ静止する状態
に、支持する支持手段と、前記フツク板に面して設置され、検出応動装置
に連動される検出作動部材とを備え、前記検出作動部材の前記フツク板への押圧に応
じて、前記フツク板および前記１対の突出係止
片、前記第２の軸ならびに前記１対の第１の軸が
連動して前記１対の第１の軸と前記１対のトリツ
プレバーとの係合が外れ、前記１対のトリツプレ
バーが回動する、回路遮断器の引き外し機構。２前記支持手段は、コの字形状を有した固定枠
を含み前記１対の第１の軸の径は前記第２の軸の
径より小であり、かつ前記１対のトリツプレバー
の回動力の方向と、前記固定枠の上辺面の方向と
のなす角度は前記第２の軸側において鈍角であ
る、特許請求の範囲第１項記載の回路遮断器の引
き外し機構。３前記フツク板は、移動した後初期設置位置に
復帰する復帰手段を有する、特許請求の範囲第１
項または第２項記載の回路遮断器の引き外し機
構。４前記復帰手段は、前記固定枠の下辺面外側に
突出した前記フツク板の一端と前記固定枠の下辺
面とをスプリングによつて接続する、特許請求の
範囲第３項記載の回路遮断器の引き外し機構。５前記検出作動部材は、前記検出応動装置にお
いて検出される電流の異常の有無に応じて、前記
フツク板を押圧または押圧しない、特許請求の範
囲第１項記載の回路遮断器の引き外し機構。６前記フツク板は、前記１対の突出係止片が接続される１対の支持
板と、前記検出作動部材の押圧を受け、かつ、その下
部に爪部を有した引き外しフツク板とを備え、前記１対の支持板と前記引き外しフツク板とは
連結され、前記検出作動部材の押圧によつて前記
引き外しフツク板と一体となつて前記１対の支持
板も傾斜する、特許請求の範囲第３項または第４
項記載の回路遮断器の引き外し機構。７前記支持手段は、コの字形状を有し、かつ、上辺面には前記１対
の支持板と前記引き外しフツク板とを傾斜自在に
貫通させる３箇所の挿通穴と前記１対のトリツプ
レバーの回動を邪魔しない２箇所の切欠を設け、
また、下辺面には前記引き外しフツク板を傾斜自
在に貫通させ、かつ前記検出作動部材の押圧に応
じた前記フツク板の傾斜時に、前記１対の支持板
を傾斜自在に貫通させる２箇所の挿通穴と前記引
き外しフツク板の前記爪部を抜き出しする挿通穴
を設けた固定枠と、前記上辺面の内側に設置された前記第２の軸と
ともに前記上辺面および前記下辺面の挿通穴を貫
通する前記フツク板の前記１対の支持板と前記引
き外しフツク板とを挟む回転自在の第３の軸と、前記上辺面の内側でかつ前記１対の突出係止片
に対応して設置され、前記第２の軸に接して外方
に設置される前記１対の第１の軸と前記第２の軸
の、前記爪部の抜き出しに応じて前記１対の突出
係止片が移動する際における移動をガイドし、ま
た前記第３の軸の移動を阻止する１対の固定ガイ
ドとを備える、特許請求の範囲第６項記載の回路
遮断器の引き外し機構。[Scope of Claims] 1. A tripping mechanism for a circuit breaker, comprising: a pair of trip levers that are connected to a circuit opening/closing mechanism and are rotatably always energized, and that engage with the pair of trip levers. a pair of independently arranged movable first shafts that prevent rotation thereof; and a movable second shaft that contacts each of the pair of first shafts and prevents their movement; a movable hook plate having a pair of protruding locking pieces for receiving the second shaft corresponding to a portion where the pair of first shafts and the second shaft touch; The pair of first shafts prevent rotation of each of the pair of trip levers, and the second shaft and the hook plate are connected to each other.
the shafts prevent movement of the pair of first shafts, and the hook plate is held stationary while preventing movement of the second shafts via the pair of protruding locking pieces. and a detection actuation member installed facing the hook plate and interlocked with a detection response device, wherein the hook plate and the first The pair of protruding locking pieces, the second shaft, and the pair of first shafts are interlocked to disengage the pair of first shafts and the pair of trip levers, and the pair of trip levers is disengaged from each other. A circuit breaker trip mechanism in which the trip lever rotates. 2. The support means includes a fixed frame having a U-shape, and the diameter of the pair of first shafts is smaller than the diameter of the second shaft, and the rotational force of the pair of trip levers is 2. The circuit breaker tripping mechanism according to claim 1, wherein the angle between the direction and the direction of the upper side surface of the fixed frame is an obtuse angle on the second axis side. 3. The hook plate has a return means for returning to the initial installation position after being moved.
The circuit breaker tripping mechanism according to item 1 or 2. 4. The circuit breaker according to claim 3, wherein the return means connects one end of the hook plate protruding outward from the lower side surface of the fixed frame with the lower side surface of the fixed frame by a spring. Tripping mechanism. 5. The circuit breaker tripping mechanism according to claim 1, wherein the detection actuation member presses or does not press the hook plate depending on whether or not there is an abnormality in the current detected by the detection response device. 6. The hook plate includes: a pair of support plates to which the pair of protruding locking pieces are connected; and a removable hook plate that receives pressure from the detection actuation member and has a claw portion at its lower part. The pair of support plates and the tripping hook plate are connected to each other, and the pair of support plates is also tilted together with the tripping hook plate by the pressure of the detection actuating member. Range 3 or 4
The circuit breaker tripping mechanism described in . 7. The support means has a U-shape, and has three insertion holes on its upper side that allow the pair of support plates and the removable hook plate to freely penetrate through the pair, and the pair of trip levers. There are two notches that do not interfere with the rotation of the
Further, the lower side surface has two locations through which the removable hook plate can be tilted freely, and through which the pair of support plates can be tilted when the hook plate is tilted in response to the pressure of the detection actuating member. a fixing frame provided with an insertion hole and an insertion hole for extracting the claw portion of the removable hook plate; and a fixing frame having an insertion hole provided on the upper side surface and the lower side surface together with the second shaft installed inside the upper side surface. a rotatable third shaft sandwiching the pair of support plates of the hook plate penetrating through the hook plate and the detachable hook plate, and installed inside the upper side surface and corresponding to the pair of protruding locking pieces. and the pair of protruding locking pieces move in response to the extraction of the claw portions of the pair of first and second shafts that are disposed outwardly in contact with the second shaft. 7. The circuit breaker tripping mechanism according to claim 6, further comprising a pair of fixed guides that guide the movement of the third shaft and prevent movement of the third shaft.