1338313 (1) 玖、發明說明 【發明所屬之技術領域〕 本發明1是有關以自動遮斷器等爲對象的電路遮斷 器’詳細的說是有關其電流遮斷部的構造。 【先前技術】 已知上述的電路遮斷器，其電流遮斷部是採用保持於 轉動式接點支架橋接形可動接點，當過電流的通電時將作 動於固定接點及可動接點之間的電磁反發力作爲驅動力使 可動接點開極的2接點切方式的電路遮斷器（例如，專利 文獻〗參照）》 且’對於前述電路遮斷器的電流遮斷部，與可動接點 組合地配置於接點支架的可動接點的接壓彈簧（在閉極位 置在可動接點及固定接點之間給與預定的接觸壓力的彈 簧），雖是採用雙扭力形的扭轉捲簧的結構，但由與本發 明同一的申請人所提案的日本特願200〗· 158〇49號，其電 流遮斷部的構造是如第5圖（a )〜（c )所示。 在第5圖（a)〜（c) ’1是電流遮斷部的殼，2、3 是內裝於殼1且配置在其對角上的電源側及負荷側的固定 接點’ 4是橋接固定接點2及3之間的轉動式的可動接 點’ 4a是對峙於固定接點2、3的接點並設在可動接點4 的兩端的可動接點’ 5是將可動接點4與後述的接壓彈簧 組合搭載的旋轉滾筒形的接點支架，6是消弧裝置（栅 極）’可動接點4是將形成於接點支架5的胴內的空部5 a (2) (2)1338313 朝直徑方向貫通地遊嵌，且作爲該可動接點4的接壓彈簧 挟持可動接點在其上下兩側（對於可動接點4的旋轉中心 〇的軸對稱位置）之間裝設一對的雙扭力形的扭轉捲黄 (以下稱呼「雙扭力彈簧」）7，由此雙扭力彈簧7的彈簧 力（力偶）在可動接點4將旋轉中心〇的周圍朝閉極方向 (逆時針方向）推迫。然而，各相的電流遮斷部是呈橫一 列組合’且使各相的接點支架5與圖示無的開閉機構連 結’藉由把手操作可總括地進行開閉操作。 且’固定接點2、3是將其先端側部分呈u字狀折 返’於主電路有大的過電流（短路電流）流動時，利用作 動於固定接點2' 3及可動接點4之間的電磁反發力使可 動接點4朝開極方向驅動來進行限流遮斷，進一步在固定 接點2 ' 3的U字折返部分配置磁性軛8，電流遮斷時加 強作用在固定/可動接點的接點間所發生的電弧的磁場來 加強朝消弧裝置6的電磁驅動力。 在此’對於搭載於接點支架5的可動接點4的支撐構 造詳細述的g舌’作爲接壓彈黄而配置於可動接點4的上下 兩側的雙扭力彈簧7 ’是如第5圖（c )所示在線圈兩端 形成L字形的腳部7a’在線圈中央部分形成呈字 开夕彎曲側方地朝突出的位移臂部7b的構造，該位移臂部 7b是橫跨可動接點4的裏面（與可動接點〇相反側的面） 地架設並在與接點支架5之間呈撓曲狀態裝設，在此位置 將位移臂部7b的先端朝可動接點4的裏面按壓接觸地朝 閉極方向按壓。然而，配置於可動接點4的上側的雙扭力 -6- (3) (3) 可動接點4的上面，配置 $是可動接點4的下面側 彈簧負荷卜 )圖所示的閉極位置中， 彈簧7是使其位移臂部7b抵接 於下側的雙扭力彈簧是使位移臂 抵接可動接點4並加上彈簧力（ 藉由這種結構，如第6(a 的彈簧負荷Π 、f2 從雙扭力彈簧7施加於可動接點 是作爲力偶作用 將可動接點 4的接點4a加壓於固定接 點2、3的接點地加上接點壓。 由此閉極、通電’在主電路有過電流（短路電流）流 動的話，承受作動於固定接點2、3及可動接點4之間的 電磁反發力使可動接點4開極動作，抵抗雙扭力彈簧7的 彈簧力朝第5圖（b )的鎖線所示的開極位置移動而延伸 在固定/可動接點間所發生的電弧，接著藉由剥去動作通 過開閉機構使接點支架5朝順時針方向轉動而完成遮斷動 作。 但是’爲了如前述過電流（短路電流）流動時由作動 於固定接點及可動接點之間的電磁反發力使可動接點朝開 極位置驅動並由限流遮斷的電路遮斷器獲得高遮斷性，而 是使開極動作時的可動接點的速度快，並保持在將固定/ 可動接點間所發生的電弧伸長的狀態下是重要的，因此使 承受電磁反發力而開極的可動接點，至電弧消滅爲止需要 持續保持於開極位置。 對於此，在前述結構中從第6圖（a)、 （b)所示的 開極、閉極的動作狀態圖可知，雙扭力彈簧7的彈簧負荷 Π 、Π (以向量表示），是無關可動接點4的開極、閉 (4) (4)1338313 極位置地使可動接點4朝閉極方向作用。且，在開極動作 時隨著固定接點及可動接點之間的極間距離增加，電磁反 發力會減少’但作用於可動接點4的彈簧負荷是相反地雙 扭力彈簧7的撓曲量也如第6圖（c)的特性圖增大。因 此在此狀況下’使可動接點4的開極速度減速來下降遮斷 性能之外’承受過電流的電磁反發力一旦使至全開位置爲 止移動的可動接點4彈返’並也加上雙扭力彈簧7的彈簧 負荷f朝閉極位置逆行，有可能使接點再投入。 在此，習知防止開極動作時的彈回的對策，是提案 有：設置使可動接點卡止保持於全開位置的卡鎖機構的構 造（例如，專利文獻2參照）；使可動接點及接點支架之 間由驅動彈簧所推迫的特殊的連桿機構連繫，通過該連桿 機構在閉極位置中使可動接點的接點按壓在固定接點地給 與負荷’在開極位置中給與相反地使可動接點朝開極方向 打開的負荷的構造（例如，專利文獻3參照）：進—步可 動接點的驅動彈簧是使形成於板彈簧的凹面及凸面的鎖緊 彈簧橫跨可動接點及殼之間，在閉極位置附近讓前述鎖緊 彈簧使可動接點朝閉極側推迫，在開極位置附近使鎖緊彈 簧反轉動作而使可動接點朝開極側推迫的結構（例如，專 利文獻4參照）等。 [專利文獻1]日本特開平6- 2 8964號公報 [專利文獻2]日本特開平1 1-31 2 45 2號公報 [專利文獻3]特別是表2002- 5 1 7 064號公報 [專利文獻4]日本特開2 00 ).2 10216號公報 (5) (5)1338313 【發明內容】 (本發明所欲解決的課題） 但是’前述習知的可動接點的彈回防止策，除接點支 架的構造複雜化且零件點數也增加之外，是有含有其接點 支架的可動機構部的質量增加會妨害電磁反發力的高速動 作而使遮斷性能下降等的問題點。然而，可動接點的驅動 彈簧是採用鎖緊彈簧的專利文獻4的結構，一見是可由簡 易的構造對應，但是實際上使彈簧特性配合可動接點的開 極、閉極動作地反轉事是困難的，且使可動接點朝閉極/ 開極位置移動途中因爲需要可使鎖緊彈簧反轉的相當的力 量1所以由過電流的電磁反發力被開極時有可能使可動接 點的開極速度減速並使遮斷特性下降。 本發明是鑑於上述點，提供一種以第5圖所示的電路 遮斷器的結構爲底基，藉由巧妙活用將作爲可動接點的接 壓彈簧組入接點支架的彈簧構件，就可由不需要追加新零 件等的變更的簡易的構造來確保高遮斷性能地改良的電路 遮斷器。 (用以解決課題的手段） 爲了達成上述目，依據本發明，是將轉動式的橋接形 可動接點遊嵌保持於接點支架，當過電流流動時由作動於 固定接點及可動接點之間的電磁反發力將可動接點朝向開 極位置驅動的電路遮斷器，且在前述接點支架是使作爲可 (6) (6)1338313 動接點的接壓彈簧功能的二組的彈簧構件對於可動接點的 旋轉中心配置於軸對稱位置’在閉極位置由前述彈簧構件 的彈簧負荷使可動接點的接點朝固定接點按壓推迫的電路 遮斷器，其特徵爲：將對於前述彈簧構件的可動接點的彈 簧負荷作用點，設定在：在閉極位置附近使可動接點朝閉 極方向推迫’在開極位置附近使彈簧負荷的作用線的方向 反轉地將可動接點朝開極方向推迫的位置，（申請專利範 圍第】項），具體上如以下的態樣所構成。 (I )彈簧構件是扭轉線圈形的雙扭力彈簧，使其彈 簧的兩端與接點支架卡合，使中央的位移臂部與可動接點 的裏面卡合地配置在其旋轉中心的軸對稱位置（申請專利 範園第2項）。 (2 )彈簧構件是板彈簧，將該彈簧撓曲的狀態下橫 跨接點支架及可動接點的裏面之間地架設在其旋轉中心的 軸對稱位置（申請專利範圍第3項）。 (3 )對於前項（])' (2 )，爲了在閉極位置吸收作 用於橋接形可動接點的二個的接點的接觸壓力不平衡來獲 得安定接觸壓’在可動接點的旋轉中心，開口有沿著連結 二組的彈寶構件的負荷作用點方向的長孔，在該長孔藉由 支軸來軸支保持於接點支架（申請專利範圍第4項）。 (4 )且’爲了讓電流遮斷部的組裝構造簡略化，而 使貫通可動接點的支軸兼具接點支架的支軸（申請專利範 圔第5)。 (5 )前項（5 )的可動接點、接點支架的支軸是之 -10 - (7) (7)1338313 外’具備貫通呈橫一列並列的各相的接點支架地與開閉機 構連繫的驅動銷，使該驅動銷與開閉機構連繫，就可將各 相的可動接點總括地操作（申請專利範圍第6項）。 (發明之效果） 在本發明中’對於將在接點支架作爲可動接點的接壓 彈簧功能的二組的彈簧構件對於可動接點的旋轉中心呈軸 對稱地配置’閉極位置由前述彈簧構件的彈簧負荷使可動 接點的接點朝固定接點按壓推迫的電路遮斷器， 使對於前述彈簧構件的可動接點的負荷作用點，設定 成：在閉極位置附近使可動接點朝閉極方向推迫，在開極 位置附近使彈簧負荷的作用線的方向反轉並使可動接點朝 開極方向推迫的位置’在此前述彈簧構件藉由採用雙扭力 彈簧或是板彈簧| 就可藉由短路電流遮斷時作動於固定接點及可動接點 之間的電磁反發力使已開極的可動接點持續保持於開極位 置’由此可維持延伸在極間所發生的電弧的狀態，且過電 流遮斷時的開極動作途中不需減速可動接點的速度，在後 半可進一步加速獲得高遮斷性能。且，可動接點的接壓彈 簧可繼續使用所具備的彈簧構件，無零件的追加，只變更 與可動接點的負荷作用點就可簡單地對應。 且’依據申請專利範圍第4的結構，可抑制隨著返覆 電流遮斷動作的接點消耗的影響而安定施加於橋接接點的 二個的接點的接觸壓力並即得平衡。進一步，藉由採用申 -11- (8) (8)1338313 請專利範圍第5、6項的結構，可達成構造的簡略化。 【實施方式】 本發明，可動接點的接壓彈簧是活用裝備於接點支架 的二組的彈簧構件，防止開極動作時的可動接點的彈回並 達成遮斷性能的提高化，使對於前述彈簧構件的可動接點 的負荷作用點，設定成：在閉極位置附近使可動接點朝閉 極方向推迫，其手段是在開極位置附近使彈簧負荷的作用 線的方向反轉使可動接點朝開極方向推迫的位置，其具體 的態樣是依據以下的實施例說明。然而，在各實施例的圖 中，對應於第5圖、第6圖的構件是附加相同符號省略其 說明。 [實施例1 ] 第1圖（a )〜（d )是顯示對應本發明的申請專利範 圍第2項的實施例。在此實施例，電流遮斷部基本上雖與 第5圖的結構同樣’但是可動接點4的接壓彈簧裝備於接 點支架5的二組的雙扭力彈簧7是如以下配置。即，挟持 可動接點4配置於其上下的雙扭力彈簧7，是對於具備於 可動接點4的旋轉中心的支軸9成爲軸對稱地朝左右變位 配置’並使從雙扭力彈簧7的中央突出的位移臂部7b比 第5圖的結構短小，將該臂部的先端嵌合於形成於可動接 點4的裏面的卡合凹部4 b地與可動接點掛合。 藉由這種結構，在第1圖（a )的閉極位置中，雙扭 -12 - 1338313 Ο) 力？早黄7的彈黄負荷fl 、f2是作爲力偶工作於可動接 點4 ’將可動接點4a朝固定接點2 ' 3的接點按壓使在接 點間加上接觸壓力。從此狀態在主電路有短路電流流動， 承受其電5灶反發力的可動接點4是開極動作的話，以支軸 9爲支點使可動接點4經過第1圖（b )的狀態朝第1圖 (c )的開極位置轉動。在此，隨著固定接點/可動接點間 的開極距離擴大使雙扭力彈簧7的彈簧負荷fl 、f2的 作用線的方向是如圖示向量地變化，在第1圖（b)的狀 態中彈簧負荷Π及f2是相互抵消使作用於可動接點4 的彈簧負何爲零，通過此地點進一步增大開極距離是的 話’如第1圖（c )所示使彈簧負荷f 1 n的作用線是 朝第1圖（a)逆方向反轉’可動接點4是承受此彈簧負 荷朝開極方向推迫。此彈簧負荷及可動接點的開極距離的 關係的特性圖是如第1圖（d )。 此結果’由短路電流遮斷時的電磁反發力開極的可動 接點4是在開極過程不會承受大的減速力，通過中間點 (第1圖（b)的狀態）的話承受雙扭力彈簧7的彈簧負荷 fl ' f2而進一步加速’至全開極位置的話即使因電流遮 斷而使電磁反發力消失，可動接點4也不會從全開位置彈 回地保持於開極位置，由此可以確保高遮斷性能。 且，從圖示構造明顯可知’與第5圖的構造相比，不 需在接點支架5追加零件就可對應。1338313 (1) Technical Field of the Invention The present invention relates to a circuit breaker for an automatic interrupter or the like, which is a structure of a current interrupting portion. [Prior Art] The above-mentioned circuit interrupter is known in which the current interruption portion is a bridge-shaped movable contact held by a rotary contact holder, and is activated at a fixed contact and a movable contact when an overcurrent is applied. A circuit breaker having a two-point cut type in which a movable contact is opened as a driving force (for example, refer to Patent Document) and a current interrupting portion for the circuit breaker described above, a movable spring that is disposed in combination with a movable contact of the movable contact of the contact holder (a spring that gives a predetermined contact pressure between the movable contact and the fixed contact at the closed position), although a double torsion type is used In the structure of the torsion coil spring, the structure of the current interruption portion is as shown in Fig. 5 (a) to (c), as disclosed in Japanese Patent Application No. 200-158-49, which is proposed by the same applicant as the present invention. . In Fig. 5 (a) to (c), "1 is a case of a current interruption portion, and 2, 3 are fixed contacts 4 which are built in the case 1 and are disposed on the power supply side and the load side opposite to the case. The movable movable contact '4a between the bridged fixed contacts 2 and 3 is a movable contact for the contacts of the fixed contacts 2, 3 and disposed at both ends of the movable contact 4' is a movable contact 4: A rotary drum-shaped contact holder mounted in combination with a pressure spring to be described later, 6 is an arc extinguishing device (gate). The movable contact 4 is a hollow portion 5 a (2) formed in the bore of the contact holder 5. (2) 1338313 is inserted in the diametrical direction, and the pressure contact spring as the movable contact 4 holds the movable contact between the upper and lower sides (the axisymmetric position of the center of rotation of the movable contact 4) A pair of double torsion-shaped torsion coils (hereinafter referred to as "double torsion springs") 7 are attached, whereby the spring force (force couple) of the double torsion springs 7 is directed toward the closing direction around the center of rotation of the movable contact 4 (counterclockwise) push. However, the current interrupting portions of the respective phases are combined in the horizontal row and the contact holders 5 of the respective phases are connected to the opening and closing mechanism (not shown). The opening and closing operations can be collectively performed by the handle operation. Moreover, 'the fixed contacts 2 and 3 are folded back in a u-shaped shape at the tip end side thereof. When the main circuit has a large overcurrent (short-circuit current) flowing, the fixed contact 2' 3 and the movable contact 4 are actuated. The electromagnetic reverse force causes the movable contact 4 to be driven in the opening direction to perform current limiting interruption, and further the magnetic yoke 8 is disposed in the U-shaped folded portion of the fixed contact 2'3, and the current is blocked to strengthen/fix. The magnetic field of the arc occurring between the contacts of the movable contact enhances the electromagnetic driving force toward the arc extinguishing device 6. Here, the 'g-tongue' described in detail on the support structure of the movable contact 4 mounted on the contact holder 5 is a double torsion spring 7' disposed on the upper and lower sides of the movable contact 4 as the fifth. The leg portion 7a' having an L-shape formed at both ends of the coil shown in Fig. 3(c) has a configuration in which a displacement arm portion 7b which is curved laterally toward the side is formed in the central portion of the coil, and the displacement arm portion 7b is movable across the movable portion 7b. The inside of the contact 4 (the surface opposite to the movable contact 〇) is erected and disposed in a flexed state with the contact holder 5, and the tip end of the displacement arm portion 7b is directed toward the movable contact 4 at this position. The inside is pressed in the direction of the closed contact. However, the double torque -6-(3) (3) movable contact 4 disposed on the upper side of the movable contact 4 is disposed at the lower side of the movable contact 4, and the closed position shown in the figure. In the middle, the spring 7 is such that the displacement arm 7b abuts against the lower side of the double torsion spring so that the displacement arm abuts the movable contact 4 and applies a spring force (by this structure, such as the spring load of the sixth (a) Π and f2 are applied to the movable contact from the double torsion spring 7 as a force couple to pressurize the contact 4a of the movable contact 4 to the contact of the fixed contacts 2 and 3, thereby applying a contact pressure. When the current circuit has an overcurrent (short-circuit current) flowing, the electromagnetic reaction force between the fixed contacts 2, 3 and the movable contact 4 is actuated to make the movable contact 4 open, and the double torsion spring 7 is resisted. The spring force moves toward the open position shown by the lock line of Fig. 5(b) to extend the arc occurring between the fixed/movable contacts, and then the contact holder 5 is clockwise by the opening and closing mechanism by the peeling action The direction is rotated to complete the interrupting action. However, in order to flow as the aforementioned overcurrent (short circuit current) Actuated by the electromagnetic back-force between the fixed contact and the movable contact, the movable contact is driven toward the open position and the circuit interrupter interrupted by the current limiting device obtains high breaking property, but the opening action is performed. The speed of the movable contact is fast and it is important to maintain the arc that is generated between the fixed/movable contacts. Therefore, it is necessary to continue the movable contact that is subjected to the electromagnetic reaction and open to the arc until the arc is extinguished. In the above configuration, from the operating state diagrams of the open and closed poles shown in FIGS. 6(a) and 6(b), the spring load of the double torsion spring 7 is Π, Π (in terms of The vector indicates) that the open contact and the open (4) (4) 1338313 of the unrelated movable contact 4 act to move the movable contact 4 toward the closed end direction, and the fixed contact and the movable point during the opening operation The distance between the poles between the contacts increases, and the electromagnetic counterforce decreases. 'But the spring load acting on the movable contact 4 is reversed. The amount of deflection of the double torsion spring 7 is also increased as shown in Fig. 6(c). Therefore, in this case, the speed of the movable contact 4 is decelerated to decrease. In addition to the breaking performance, the electromagnetic reverse force that is subjected to the overcurrent rebounds when the movable contact 4 that moves to the fully open position is reversed, and the spring load f of the double torsion spring 7 is reversed toward the closed position, and it is possible to make the connection. In order to prevent the bounce of the opening operation, it is proposed to provide a structure for locking the movable contact to the fully open position (for example, refer to Patent Document 2); A special link mechanism between the movable contact and the contact bracket pushed by the drive spring is connected, and the contact of the movable contact is pressed at the fixed contact by the link mechanism in the closed position The load 'in the open position is a structure that gives a load that opens the movable contact in the opening direction in reverse (for example, refer to Patent Document 3): the drive spring of the movable contact is a concave surface formed on the leaf spring And a convex locking spring spans between the movable contact and the shell, and the locking spring urges the movable contact toward the closed side near the closed position, and the locking spring is reversed in the vicinity of the open position. Make the movable contact point Electrode side urging structure (e.g., refer to Patent Document 4) and the like. [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. 4] Japanese Patent Laid-Open No. 2 00). 2 No. 10216 (5) (5) 1338313 [Description of the Invention] (The problem to be solved by the present invention) However, the above-mentioned conventional movable contact bounce prevention mechanism is removed. In addition to the complicated structure of the point holder and the increase in the number of parts, there is a problem that the mass of the movable mechanism portion including the contact holder increases the high-speed operation of the electromagnetic reaction force and degrades the blocking performance. However, the drive spring of the movable contact is a structure of the patent document 4 which employs a lock spring, and it can be seen by a simple structure at first sight, but actually, the spring characteristic is matched with the opening and closing of the movable contact. Difficult, and moving the movable contact toward the closed/open position because there is a need for a considerable force 1 that can reverse the lock spring. Therefore, it is possible to make the movable contact when the electromagnetic back force of the overcurrent is turned on. The opening speed is decelerated and the breaking characteristics are degraded. The present invention has been made in view of the above, and provides a spring member having a structure in which the circuit breaker shown in FIG. 5 is used as a base member, and the spring member as a movable contact is incorporated into the contact holder. A circuit breaker that improves the high blocking performance without requiring a simple structure to change the new parts or the like. (Means for Solving the Problem) In order to achieve the above object, according to the present invention, a rotary bridge-shaped movable contact is held in a contact holder, and when the overcurrent flows, the fixed contact and the movable contact are actuated. The electromagnetic reverse force between the movable contacts and the circuit breaker driven by the open position, and the above-mentioned contact bracket is a group of two functions of the pressure spring which can be used as the movable contact of (6) (6) 1338313 The spring member is disposed at an axisymmetric position with respect to the center of rotation of the movable contact. The circuit breaker that pushes the contact of the movable contact toward the fixed contact by the spring load of the spring member at the closed position is characterized by : the spring load acting point of the movable contact of the spring member is set such that the movable contact is urged toward the closed end direction near the closed pole position. The direction of the action line of the spring load is reversed near the open position. The position where the movable contact is urged toward the opening direction (the patent application scope item) is specifically constituted as follows. (I) The spring member is a torsion coil-shaped double torsion spring, such that both ends of the spring are engaged with the contact bracket, and the central displacement arm portion is engaged with the inner side of the movable contact to be axially symmetrically disposed at the center of rotation thereof. Location (Application for Patent Park No. 2). (2) The spring member is a leaf spring, and the spring is erected between the contact holder and the inside of the movable contact at an axisymmetric position of the center of rotation (the third item of the patent application). (3) For the former item (])' (2), in order to absorb the contact pressure imbalance acting on the two joints of the bridge-shaped movable contact at the closed-pole position, the stable contact pressure is obtained at the center of rotation of the movable contact The opening has a long hole along the direction of the load application point of the two sets of the elastic member, and the long hole is pivotally held by the support bracket on the contact support (article 4 of the patent application). (4) In order to simplify the assembly structure of the current interruption portion, the support shaft that penetrates the movable contact also has a support shaft of the contact holder (Patent Patent No. 5). (5) The movable contact of the above item (5) and the fulcrum of the contact bracket are -10 - (7) (7) 1338313 Externally, the contact bracket with the phases parallel to each other is connected to the opening and closing mechanism. The drive pin of the system is connected to the opening and closing mechanism to integrally operate the movable contact of each phase (item 6 of the patent application). (Effects of the Invention) In the present invention, the spring members of the two sets of the springs that function as the contact springs of the movable contact are axially symmetrically arranged with respect to the center of rotation of the movable contact. The spring load of the member causes the contact of the movable contact to press the pushed circuit breaker toward the fixed contact, so that the load acting point of the movable contact of the spring member is set such that the movable contact is made near the closed position Pushing in the direction of the closing direction, in the vicinity of the opening position, the direction of the line of action of the spring load is reversed and the movable contact is urged toward the opening direction. Here, the spring member is made of a double torsion spring or a plate. The spring | can be actuated by the electromagnetic reaction between the fixed contact and the movable contact when the short-circuit current is interrupted, so that the open movable contact is continuously maintained at the open position, thereby maintaining the extension between the poles The state of the arc that occurs, and the speed of the movable contact is not required to be decelerated during the opening operation when the overcurrent is interrupted, and the high breaking performance can be further accelerated in the latter half. Further, the spring-loaded spring of the movable contact can continue to use the spring member provided, and the addition of the component can be easily performed, and only the load point of the movable contact can be changed. Further, according to the fourth configuration of the patent application, it is possible to suppress the contact pressure applied to the two contact points of the bridge contact in accordance with the influence of the contact consumption of the return current interruption operation, and to achieve balance. Further, the structure can be simplified by adopting the structure of the fifth and sixth aspects of the patent application of -11-(8) (8) 1338313. [Embodiment] In the present invention, the pressure contact spring of the movable contact is a spring member that is provided with two sets of the contact brackets, thereby preventing the rebound of the movable contact during the opening operation and improving the breaking performance. The load acting point of the movable contact of the spring member is set such that the movable contact is urged in the closing direction in the vicinity of the closed position, and the direction of the action line of the spring load is reversed in the vicinity of the open position. The specific position of the position where the movable contact is urged toward the opening direction is explained in accordance with the following embodiments. However, in the drawings of the respective embodiments, the members corresponding to those in Figs. 5 and 6 are denoted by the same reference numerals, and the description thereof is omitted. [Embodiment 1] Figs. 1(a) to (d) are diagrams showing an embodiment corresponding to the second item of the patent application scope of the present invention. In this embodiment, the current blocking portion is basically the same as the configuration of Fig. 5, but the two sets of the double torsion springs 7 of the contact springs of the movable contact 4 are arranged as follows. In other words, the double torsion springs 7 that are placed on the upper and lower sides of the movable contact 4 are arranged such that the support shafts 9 provided at the center of rotation of the movable contact 4 are axially symmetrically displaced from the left and right torsion springs 7 The displacement arm portion 7b protruding in the center is shorter than the configuration of Fig. 5, and the tip end of the arm portion is fitted to the engagement recess portion 4b formed on the inner surface of the movable contact 4, and is engaged with the movable contact. With this configuration, in the closed-pole position of Fig. 1(a), the double twist -12 - 1338313 Ο) force? The yellowing loads f1 and f2 of the early yellow 7 are operated as a couple on the movable contact 4', and the movable contact 4a is pressed toward the contact of the fixed contact 2'3 to apply a contact pressure between the contacts. From this state, when the short-circuit current flows in the main circuit, and the movable contact 4 that receives the reverse force of the electric 5 is the opening operation, the movable contact 4 is moved to the state of FIG. 1(b) with the support shaft 9 as a fulcrum. The open position of Fig. 1(c) is rotated. Here, as the opening distance between the fixed contact and the movable contact is enlarged, the direction of the line of action of the spring loads fl and f2 of the double torsion spring 7 changes as shown in the figure vector, in FIG. 1(b) In the state, the spring load Π and f2 cancel each other so that the spring acting on the movable contact 4 is zero, and if the opening distance is further increased by this point, the spring load f 1 n is shown as shown in Fig. 1(c). The line of action is reversed in the reverse direction of Fig. 1(a). The movable contact 4 is urged against the spring load in the direction of the opening. The characteristic diagram of the relationship between the spring load and the opening distance of the movable contact is as shown in Fig. 1(d). As a result, the movable contact 4 that is opened by the electromagnetic reverse force when the short-circuit current is interrupted is not subjected to a large deceleration force during the opening process, and is subjected to the double through the intermediate point (the state of Fig. 1(b)). When the spring load f'f2 of the torsion spring 7 is further accelerated to the full open position, even if the electromagnetic reverse force is lost due to the current interruption, the movable contact 4 does not rebound from the fully open position to the open position. This ensures high breaking performance. Further, it is apparent from the diagram structure that it is possible to correspond to the structure of Fig. 5 without adding a component to the contact holder 5.
[實施例2 J -13- (10) (10)1338313 接著對應本發明的申請專利範圍第3及4項的實施例 是如第2圖（a)〜（c)所示。此實施例，是將前述實施 例〗在的雙扭力彈簧7置換成構造的簡單的板彈簧丨〇 , 如圖示將二組的板彈簧1 0撓曲的狀態下架設於可動接點 4的上下側裏面及接點支架5之間，在第2圖（a )的閉 極位置中由板彈簧1 〇的彈簧負荷fl ' f2使可動接點4 的接點朝固定接點按壓推迫。且，在可動接點4的旋轉中 心雖開口有通過支軸9的軸孔，但是此軸孔是形成沿著連 結前述二組的板彈簧1 〇及可動接點4的卡合點的線的長 孔4b。 這種結構’由主電路的短路電流所產生的電磁反發力 使可動接點4開極動作的話，與前述的實施例1同樣隨著 極間距離的增加而變化作用於可動接點4的彈簧負荷 Π 、f2的作用線的方向1由此可動接點4是經過第2圖 (b)的狀態保持於第2圖（c)的全開極位置。且，可動 接點4的接點4 a是因電流遮斷動作的返覆而消耗，其接 點消耗量雖是在形成於橋接形可動接點4的兩端的二個的 接點之間產生差異，但是藉由將如圖示的可動接點4的中 心軸孔遊嵌於作爲長孔4 b的支軸9，使無關於接點消耗 量的參差不一，在閉極狀態中使二組的板彈簧〗〇的彈簧 負荷在可動接點4的二個的可動接點/固定接點間平衡佳 地作用而可以給與安定接觸壓力。 且’彈簧構件藉由採用板彈簧1 〇，相比於實施例1 的雙扭力彈簧7，零件的搆造簡單，可達成接點支架的小 -14 - (11) 1338313 形化。 接者’將實施例】、2的電流遮斷部、及其電流遮斷 部3相分組合構築的3相電路遮斷器的組裝構造作爲實施 例3貫施例4如第3圖 '第4圖所示° 丨實施例3 ] 在第3圖，在此實施例中構成3相電路遮斷器的各相 的電流遮斷部，是兼用在前述的實施例中貫通可動接點4 的旋轉中心用的支軸9的接點支架5的支軸的結構。 即’支軸9是貫通接點支架5的旋轉中心，並讓其軸 端由形成於電流遮斷部的殼1 (二分割構造）的內側的軸 承部（無圖示）支撐’使可動接點4及接點支架5轉動可 能地被軸支。進一步，在前述支軸9之外，在貫通開口於 接點支架5及殼1的側壁面的圓弧狀的軸孔]a的各相設 置共通的驅動銷U，使此驅動銷]]通過呈左右一列並列 的各相的電流遮斷部並藉由電路遮斷器的開閉機構丨2與 操作把手（揺臂把手）1 3連 》 由上述結構將操作把手1 3朝導通、斷開位置倒下的 話，藉由開閉機構丨2使驅動銷】I朝上下方向動作在這 連動使各相的電流遮斷部的接點支架5以前述支軸9爲中 心轉動使可動接點4朝開極 '閉極位置驅動。 依據此組裝構造，共用 接點支架5將轉動可能地被 銷' 】】橫跨架設於各相的電 ]條的支軸9使可動接點4及 軸支，進一步藉由將別的驅動 流遮斷部之間，就可由少零件 -15- (12) 1338313 點數及簡易的構造達成可動接點4 '接 撐 '及各相的電流遮斷部及開閉機構1 [實施例4 ] 接著前述實施例3的應用實施例$ 施例3 (第3圖參照）的結構中，在將 部呈左右並列結合組裝的狀態下，設右 在一直線上一致並列的話，藉由驅動鮮 電流遮斷部進行導通、斷開操作時，1 圓滑地連動操作。 在此，在此實施例中爲了補償前纪 一使各相的電流遮斷部可圓滑地連動搏 電流遮斷部使2本的驅動銷1 1架設在 轉中心位移的位置的同時，對於設在名 支軸9，是由3相的任一1相軸承支携 他的2相是使在支軸9的支撐有一些的 殼1的軸承部，通過前述2本的驅動_ 將驅動力朝各相的電流遮斷部傳達來將 導通、斷開位置。 由此，在將各相的電流遮斷部結合 精度有一些的參差不一，也無咬住等的 相的電流遮斷部圓滑地連動操作。 【圖式簡單說明〕 點支架5的轉動支 2的連繫。 4圖所示。即在實 3相分的電流遮斷 各相的支軸9不是 11連動3相分的 產生咬住等而無法 組裝精度的參差不 作，而橫跨各相的 從接點支架5的旋 相的電流遮斷部的 於定位置，對於其 鬆動地遊嵌支撐於 ]1從開閉機構1 2 接點支架5驅動至 的狀態下即使組裝 問題產生，可使各 -16- (13) (13)1338313 [第1圖]對應於本發明的實施例1的電流遮斷部的動 作說明圖，（a)、 （ b)、 （ c )各是閉極、開極途中、開 極位置的動作狀態的圖，（d )是極間距離及彈簧負荷的 關係的特性圖。 [第2圖〕對應於本發明的實施例2的電流遮斷部的動 作說明圖，（a)' ( b) ' (c)各是閉極、開極途中、開 極位置的動作狀態的圖。 [第3圖]對應於本發明的實施例3的3相電路遮斷器 的組裝構造的分解立體圖。 [第4圖]對應於本發明的實施例4的3相電路遮斷器 的組裝構造的分解立體圖。 [第5圖]成爲本發明的實施對象的電路遮斷器的習知 的電流遮斷部的結構圖，（a)、 （b)各是內部構造的平 面圖、側面圖，（c )是可動接點及接點支架的組裝構造 的立體圖。 [第6圖]第5圖的動作說明圖，（a)、 （b)各是閉 極、開極位置的動作狀態的圖，（c )是極間距離及彈簧 負荷的關係的特性圖。 [圖號說明] 1殼 1 a軸孔 2 ' 3固定接點 4橋接形可動接點 -17 - (14) (14)1338313 4 a可動接點 4b 卡合凹部 5 接點支架 5a 空部 6消弧裝置 7雙扭力彈簧 7 a腳部 7b位移臂部 8 磁性軛 9 支軸 〗〇板彈簧 1 1 驅動銷 1 2 開閉機構 I 3操作把手（摇臂把手） -18 -[Embodiment 2] J-13-(10) (10) 1338313 Next, the embodiments corresponding to the third and fourth aspects of the patent application of the present invention are as shown in Figs. 2(a) to (c). In this embodiment, the double torsion spring 7 of the foregoing embodiment is replaced with a simple leaf spring 构造 of the structure, and the two sets of the leaf springs 10 are erected on the movable contact 4 as shown in the figure. Between the upper and lower sides and the contact holder 5, the contact of the movable contact 4 is pressed against the fixed contact by the spring load fl 'f2 of the leaf spring 1 在 in the closed position of Fig. 2(a). Further, a shaft hole that passes through the support shaft 9 is opened at the center of rotation of the movable contact 4, but the shaft hole is formed along a line connecting the engagement points of the leaf springs 1 and the movable contact 4 of the two groups. Long hole 4b. In the above-described configuration, the electromagnetic reverse force generated by the short-circuit current of the main circuit causes the movable contact 4 to operate in an open state, and changes to the movable contact 4 as the distance between the poles increases as in the first embodiment. In the direction 1 of the line of action of the spring load Π and f2, the movable contact 4 is held at the fully open position of Fig. 2(c) in the state of Fig. 2(b). Further, the contact 4a of the movable contact 4 is consumed by the return of the current interruption operation, and the contact consumption amount is generated between the two contacts formed at both ends of the bridge-shaped movable contact 4. Difference, but by inserting the central axis hole of the movable contact 4 as shown in the support shaft 9 as the long hole 4 b, the difference in the amount of contact consumption is different, and in the closed state The spring load of the group springs can balance the two movable contacts/fixed contacts of the movable contact 4 to give a stable contact pressure. Moreover, by using the leaf spring 1 弹簧, the structure of the part is simpler than that of the double torsion spring 7 of the first embodiment, and the small-14 - (11) 1338313 shape of the contact holder can be achieved. The assembly structure of the three-phase circuit breaker in which the current interruption unit and the current interruption unit 3 are combined and constructed in the same manner as in the third embodiment is as described in the third embodiment. 4 shows a third embodiment. In the third embodiment, the current blocking portion of each phase constituting the three-phase circuit breaker in this embodiment is used in the above-described embodiment to penetrate the movable contact 4. The structure of the fulcrum of the contact holder 5 of the support shaft 9 for the center of rotation. In other words, the support shaft 9 is a rotation center of the through-point holder 5, and the shaft end is supported by a bearing portion (not shown) formed inside the casing 1 (two-division structure) of the current interruption portion. Point 4 and the contact bracket 5 are rotated by the shaft. Further, in addition to the above-described support shaft 9, a common drive pin U is provided in each phase of an arc-shaped shaft hole]a that opens through the contact holder 5 and the side wall surface of the case 1, and the drive pin is passed through] The current interruption portion of each phase in the left and right rows is connected to the operation handle (the arm handle) by the opening and closing mechanism 丨2 of the circuit breaker. The operation handle 13 is turned to the on and off positions by the above structure. When it is fallen, the drive pin 】I is moved in the vertical direction by the opening and closing mechanism 丨2, and the contact holder 5 of the current interruption portion of each phase is rotated about the support shaft 9 so that the movable contact 4 is opened. Extremely 'closed position drive. According to this assembly structure, the common contact holder 5 will be rotated by a pin erecting the fulcrums 9 of the electric strips of the respective phases to make the movable contact 4 and the shaft branch, further by driving the other drive flow Between the blocking portions, the movable contact 4 'connection' and the current interruption portion and the opening and closing mechanism 1 of each phase can be obtained by a small number of -15-(12) 1338313 points and a simple structure. [Example 4] In the configuration of the third embodiment of the third embodiment, in the configuration of the third embodiment (refer to FIG. 3), in the state where the portions are assembled side by side in the right and left, and the right side is aligned in parallel, the current is interrupted by driving the fresh current. When the part is turned on or off, 1 is smoothly operated. Here, in this embodiment, in order to compensate for the previous one, the current blocking portion of each phase can smoothly connect the current interrupting portion so that the two driving pins 1 1 are placed at the position of the center shift, and In the name support shaft 9, the two-phase bearing supported by any one of the three-phase bearings is the bearing portion of the casing 1 which supports some of the support shafts 9, and the driving force is driven by the aforementioned two The current blocking portion of each phase conveys the conduction and disconnection positions. As a result, there is a slight difference in the accuracy of the current blocking portion of each phase, and the current blocking portion of the phase without biting or the like smoothly operates in a smooth manner. [Simple description of the drawing] The connection of the rotation branch 2 of the point holder 5. Figure 4 shows. That is, the current of the three phases is interrupted, and the fulcrums 9 of the respective phases are not interlocked by the three-phase, three-phase, and the like, and the unevenness of the assembly accuracy is not performed, and the phase of the susceptor from the contact holder 5 is traversed. The position of the current interruption portion can be loosely supported by the support member 1 in the state of being driven from the opening and closing mechanism 1 2 to the contact holder 5, and even if an assembly problem occurs, each of the -16-(13) (13) 1338313 [Fig. 1] An operation explanatory diagram of the current interrupting unit according to the first embodiment of the present invention, wherein (a), (b), and (c) are operating states of the closed pole, the open pole, and the open position. The graph (d) is a characteristic diagram of the relationship between the interpole distance and the spring load. [Fig. 2] An operation explanatory diagram of the current interrupting unit according to the second embodiment of the present invention, wherein (a) '(b) ' (c) is an operating state of the closed pole, the open pole, and the open position. Figure. [Fig. 3] An exploded perspective view showing an assembly structure of a three-phase circuit breaker according to a third embodiment of the present invention. [Fig. 4] An exploded perspective view showing an assembled structure of a three-phase circuit breaker according to a fourth embodiment of the present invention. [Fig. 5] A configuration diagram of a conventional current interrupting portion of a circuit breaker to be implemented in the present invention, wherein (a) and (b) are plan views and side views of the internal structure, and (c) is movable. A perspective view of the assembled structure of the contacts and the contact brackets. [Fig. 6] Fig. 5 is an operation explanatory diagram of Fig. 5, (a) and (b) are diagrams showing the operating states of the closed pole and the open position, and (c) is a characteristic diagram showing the relationship between the interpole distance and the spring load. [Description of the figure] 1 shell 1 a shaft hole 2 ' 3 fixed contact 4 bridge type movable contact -17 - (14) (14) 1338313 4 a movable contact 4b engagement recess 5 contact bracket 5a empty portion 6 Arc extinguishing device 7 Double torsion spring 7 a Foot 7b Displacement arm 8 Magnetic yoke 9 Axle 〇 弹簧 spring 1 1 Drive pin 1 2 Opening and closing mechanism I 3 Operating handle (rocker handle) -18 -