200901259 九、發明說明 【發明所屬之技術領域】 本發明是有關於電路斷路器，尤其適用於提高以二對 接點實行開閉的接點的接觸性及耐久性的方法。 【先前技術】 在低壓電路中，爲了斷開流向負載的短路電流或負載 電流，使用配線用斷路器及漏電斷路器等電路斷路器。在 此’在以一對接點實行開閉的電路斷路器中，爲了提高接 點的接觸穩定可靠性’提出使得可動接點朝固定接點方向 能蹺蹺板式（seesaw )回轉的構成方法（參照專利文獻ι )° 第8圖是表示以往的以二對接點實行開閉的電路斷路 器的接點部分的槪略構成立體圖。 在第8圖中，在電路斷路器中’設有與電源端子Η 連接的第二固定 連接的弟固疋接點54，與連接導體 接點56,以及由開閉機構驅動開閉的橋接觸頭57BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker, and is particularly suitable for improving the contact and durability of a contact that is opened and closed by two pairs of contacts. [Prior Art] In a low voltage circuit, in order to open a short-circuit current or a load current flowing to a load, a circuit breaker such as a wiring breaker or an earth leakage breaker is used. In the circuit breaker that opens and closes with a pair of contacts, in order to improve the contact stability of the contacts, a method of making a movable joint to seesaw in the direction of the fixed contact is proposed (refer to the patent literature). (1) Fig. 8 is a schematic perspective view showing a contact portion of a conventional circuit breaker that is opened and closed by two pairs of contacts. In Fig. 8, in the circuit breaker, a second fixed connection of the second solid connection 与, which is connected to the power supply terminal ,, and a connection conductor contact 56, and a bridge contact 57 which is opened and closed by the opening and closing mechanism are provided.
5 7的兩端 ，橋接兩固定接點54, 善頭臂60的前端，支 橋接觸頭5 7的兩端的 •方向能蹺蹺板式回轉 在此’橋接觸頭 形成接點臂 57c, 57d ’其從基體 200901259 導體57a兩端互相對向突出，可動接點58, 59分別固定在 接點臂57c, 57d的前端，同時，在基體導體57a的中央部 形成連接孔57b。並且，通過將可動觸頭臂60插入連接孔 57b中’保持回轉自如，同時，通過使得可動觸頭臂60的 方杆與連接孔5 7b相碰，起著止動件的功能。 並且，在與止動件相碰前，可動接點58, 59能自由回 轉，即使可動接點58，59的厚度和固定接點54，56的厚 度因消耗等產生互相不同場合，也能防止一方的可動接點 5 8, 5 9與固定接點54，56不接觸引起導通不良。 專利文獻1 :日本特開平I 1-2 73 53 6號公報。 但是’在專利文獻1所揭示的方法中，在與止動件相 碰則’可動接點58，59能自由回轉，因此，有時在可動接 點5 8, 59脫離固定接點54，56狀態下，橋接觸頭57回轉 。因此’存在以下問題：當接通電路斷路器時，橋接觸頭 5 7保持朝左右某一方傾斜，僅僅可動接點5 8，5 9中某一 方先與固定接點54或56接觸，接通時間發生偏差，開閉 負載集中在可動接點58或59，因此，有可動接點58，59 破損或脫落的危險性大的問題。 另外’作用著傾斜的橋接觸頭5 7回復到水平的回轉 力’因此’存在著固定接點54, 56的角易脫落的問題。 弟7圖是表不以住接通電路斷路器時可動接點的傾斜 狀態的正面圖。 在第7圖中，在電路斷路器中’設有連接導體1〇3及 電源端子l〇b’固定接點4a與連接導體l〇a的前端接合， -6- 200901259 固定接點4b與電源端子i〇b的前端接合 路器中設有可動件3，在其兩端設有互相 臂’在上述一對臂的前端接合可動接點2 ; 定接點4a，4b對向。並且，可動件3以可 回轉軸’回轉自如地支撐在夾具1上。 並且，在第7圖構成中，在可動接點 接點4 a，4 b狀態下，有時可動件3以可動 爲中心回轉。因此，當接通電路斷路器時 朝左右某一方傾斜，僅僅可動接點2 a, 2 b 定接點4a，4b接觸，引起可動接點2a，2b 發生固定接點4a，4b的角脫落。 【發明內容】 本發明就是爲解決上述先有技術所存 來的’其目的在於，提供一種使得以二對 接點的開閉負載均一化、同時能提高上述 路斷路器。 爲了達到上述目的，依照申請專利範| 電路斷路器，其特徵爲·具備：一對固定 設有配置爲互相對向的一對臂；一對可動 在上述臂的端部’可分別與上述固定接讓占丨 可動件支撐件’阻止上述可動件以上 軸爲中心進行旋轉；夾具，用於支撐上述 使得上述可動接點能朝著上述固定接@ $ 。又，在電路斷 對向配置的一對 I, 2b，使其與固 動件連接杆5爲 2a，2b脫離固定 件連接杆5的軸 ，可動件3保持 中某一方先與固 破損或脫落，或 在的問題而提出 接點實行開閉的 接點接觸性的電 圓第1項所述的 接點；可動件， 接點，分別固定 述一對臂之間的 可動件支撐件， 向旋轉；開閉機 200901259 構’用於驅動上述可動件開閉；止動件，上述可動接點與 上述固定接點接觸前’抑制上述可動件以上述一對臂間的 軸爲中心旋轉，上述可動接點的至少任一方與上述固定接 點接觸後，容許上述可動件以上述一對臂間的軸爲中心旋 轉。 這樣’在可動接點脫離固定接點狀態下，能防止可動 件以可動件的一對臂間的軸爲中心回轉，即使當可動接點 的厚度及固定接點的厚度因消耗等互相不同場合，也能使 得可動接點兩方可靠地與固定接點接觸。因此，即使在以 二對接點實行開閉場合，也能防止一方的可動接點不接觸 而引起導通不良’提高接點的接觸穩定可靠性，同時，能 防止在可動件傾斜向左右某一方狀態下僅僅可動接點中某 一方先與固定接點接觸，能抑制可動接點破損，或固定接 點的角脫落。 又，依照申請專利範圍第2項所述的電路斷路器，其 中’具備安裝在上述可動件上的可動件保護蓋；在上述可 動件保護蓋上形成凸部，作爲上述止動件，當上述可動接 點脫離上述固定接點時，上述凸部與上述夾具面抵接；上 述開閉機構使得夾具過量旋轉以超過上述可動接點與上述 固定接點接觸的位置，以便使得上述可動接點與上述固定 接點接觸時，上述凸部和夾具面之間空有間隙。 這樣，能抑制電路斷路器的結構複雜化，且能使得以 二對接點實行開閉的接點負載均一化，同時，能提高上述 接點的接觸性，抑制電路斷路器大型化及高價格化，能提 -8- 200901259 高電路斷路器的耐久性。 又，依照申請專利範圍第3項所述的電路斷路器，其 中’使得上述可動接點朝著上述固定接點方向旋轉的旋轉 中心設在上述可動件支撐件上，設有用於對上述可動件支 撐件彈推的彈推手段，以便將接觸壓力給予上述可動接點 〇 這樣，當可動接點與固定接點接觸時，能朝固定接點 推壓可動接點，即使可動件能以一對臂間的軸爲中心回轉 場合，也能實現接觸壓力均等化。 又’申請專利範圍第4項所述的電路斷路器，其中， 上述彈推手段設有：銷’插入上述可動件支撐件的左右側 面；壓接彈簧’配置在上述夾具內，經通過將腳掛在上述 銷上，將接觸壓力給予上述可動接點。 這樣’能在夾具內穩定保持可動件支撐件，能使得施 加到可動件支撐件上的力左右對稱，即使可動件能以一對 臂間的軸爲中心回轉場合，也能實現接觸壓力均等化。 下面說明本發明效果。 如上述’根據本發明，即使在以二對接點實行開閉場 合，也能防止一方的可動接點不接觸而引起導通不良，提 高接點的接觸穩定可靠性，同時，能防止在可動件傾斜向 左右某一方狀態下僅僅可動接點中某一方先與固定接點接 觸，能抑制可動接點破損，或固定接點的角脫落。 【實施方式】 -9- 200901259 下面參照附圖詳細說明本發明實施例涉及的電路斷路 器。在以下實施例中，雖然對構成要素，種類，組合，形 狀，相對配置等作了各種限定，但是，這些僅僅是例舉， 本發明並不侷限於此。 第1圖是表示本發明一實施例涉及的電路斷路器的槪 略構成的縱截面圖，第2圖是放大表示第1圖的電路斷路 器的夾具1及可動件3部分的立體圖，第3圖是放大表示 第1圖的電路斷路器的可動件3及可動件保護蓋6部分的 立體圖。 在第1圖-第3圖中，在電路斷路器中，設有固定在 殻體1 1上的連接導體l〇a及電源端子l〇b，固定接點4a 與連接導體l〇a的前端接合，固定接點4b與電源端子l〇b 的前端接合。 又，在電路斷路器中設有可動件3，在其兩端設有互 相對向配置的一對臂3a, 3b，在上述一對臂3a，3b的前端 接合可動接點2a，2b，使其分別與固定接點4a，4b對向。 並且，在可動件3的中央，連接可動件連接杆5，使 其朝著臂3 a, 3 b的相反側突出，可動件3以可動件連接杆 5爲回轉軸回轉自如，以可動件支撐件7支撐。並且，可 動件支撐件7組裝在作爲絕緣體的夾具1上，上述夾具i 被支撑能通過開閉軸回轉。 在可動件3的下面側，安裝朝可動件連接杆5側延伸 的可動件保護蓋6，可動件保護蓋6從兩側覆蓋可動件連 接杆5的下部，同時，在可動件保護蓋6的底面形成凸部 -10- 200901259 6a田可動接點2a，2b與固定接點4a，#脫開時，上述凸 部6a與夾具1的面相接。 又，在電路斷路器中設有開閉機構30，與固定接點 4a, 4b之間，實行可動件3的開閉動作，開閉機構3 〇能 以與夾具1成爲一體的開閉軸爲支點，驅動可動件3開閉 〇 再有’在電路斷路器中設有跳閘機構及過流跳閘裝置 27，上述跳閘機構使得開閉機構3〇的鎖閉解扣，上述過 流跳閘裝置2 7檢測過流使得上述跳閘機構動作。在此， 雙金屬’發熱導體’電樞及電磁鐵組裝在過流跳閘裝置2 7 中’根據通過負載側端子1 2流經的過流的檢測結果，能 通過熱動式或電磁式發生機械撓曲。並且，跳閘機構通過 跳閘橫杆25將過流跳閘裝置27產生的機械撓曲傳遞到開 閉機構3 0，能使得開閉機構3 0的鎖閉解扣。 開閉手柄13與手柄杆14連接，組裝爲手柄杆14與 開閉手柄1 3連動。在電路斷路器中設有用於支撐開閉機 構3 0的側板21，在側板21上設有回轉中心，手柄杆14 以杆軸爲支點擺動自如。手柄杆14與開閉彈簧16 —端連 接，開閉彈簧1 6另一端與觸發器銷1 8連接。 在電路斷路器中設有由第一連杆15和第二連杆17構 成的觸發器機構’上述第一連杆15和第二連杆17通過觸 發器銷1 8相互連接，第一連杆1 5的上端與問鎖件19連 接，第二連杆17與夾具1連接。由拉伸彈簧構成開閉彈 簧16’該開閉彈簧16的下端钩部掛在觸發器銷18上’開 -11 - 200901259 閉彈簧16的上端钩部掛在手柄杆I#的上端。在此，觸發 器機構及開閉彈簧16可以構成電路斷路器的開閉機構3〇 ’通過手柄杆1 4的開閉操作，使得相對開閉彈簧1 6的作 用方向反轉’驅動夾具1開閉，同時，通過解除閂鎖件i 9 的系止’使得開閉彈簧1 6相對觸發器機構的作用反轉， 能驅動夾具1開閉。 在側板21上設有連杆止動件22，其通過與觸發器銷 18接觸，使得觸發器機構在所定位置停止。又，在電路斷 路器中設有閂鎖件1 9 ’被支撐爲以閂鎖件回轉軸2 0爲支 點回轉自如，還設有閂鎖件座2 3及跳閘橫杆2 5，上述尸习 鎖件座2 3構成爲能與閂鎖件1 9結合，上述跳閘橫杆2 5 構成爲能與閂鎖件座2 3結合。 在此’閂鎖件1 9構成爲能繞閂鎖件回轉軸2 0回轉， 閂鎖件座23構成爲能繞閂鎖件座回轉軸24回轉，跳閘橫 杆25構成爲能繞橫杆回轉軸26回轉。 並且’通過開閉手柄13的朝左右方向的開閉操作， 驅動與開閉手柄13連動的手柄杆14，以及通過開閉彈寶 16動作的觸發器機構。並且，與夾具1連接的可動件3與 夾具1 —起回轉，可動接點2a，2b與固定接點4a，4b接觸 或脫離，能實現閉合或斷開動作。 在此，開閉機構3 0可以使得夾具1超過可動接點 2b與固定接點4a，4b接觸的位置過回轉，以便使得可動 接點2a, 2b與固定接點4a，4b接觸時，凸部6a和夾具i 的凹面之間空有間隙。 -12- 200901259 並且’當可動接點2a，2b脫離固定接點4a，4b時，可 動件保護蓋6的凸部6a與夾具1的面相接，抑制可動件3 以可動件連接杆5的軸爲中心回轉，當可動接點2a，2b與 固定接點4a，4b接觸時，可動件保護蓋6的凸部6a離開 夾具1的面，能允許可動件3以可動件連接杆5的軸爲中 心回轉。 這樣’在可動接點2a，2b脫離固定接點4a，4b狀態下 ’能防止可動件3以可動件連接杆5的軸爲中心回轉，同 時’即使當可動接點2a，2b的厚度及固定接點4a，的厚 度因消耗等互相不同場合，能使得可動接點2a，2b兩方可 靠地與固疋接點4 a，4 b接觸。因此，即使在以二對接點眚 行開閉場合，也能防止一方的可動接點2a，2b不接觸而引 起導通不良’提高接點的接觸穩定可靠性，同時，能防止 在可動件3傾斜向左右某一方狀態下僅僅可動接點2a，2b 中某一方先與固定接點接觸，能抑制可動接點2a，2b破損 ’或固定接點4a, 4b的角脫落。 第4 ( a)圖是表示可動接點2a, 2b和固定接點4a，4b 相互脫開時的可動件保護蓋6狀態的縱截面圖，第4 ( b ) 圖是表示可動接點2a，2b和固定接點4a，4b相互閉合時的 可動件保s蔓蓋6狀態的縱截面圖’第5 ( a )圖是表示可動 接點2a，2b和固定接點4a, 4b相互脫開時的可動件保護蓋 6狀態的橫截面圖’第5 ( b )圖是表示可動接點2 a，2b和 固定接點4a，4b相互閉合時的可動件保護蓋6狀態的橫截 面圖’第6圖是表示第5圖的壓接彈簧8的裝入狀態的正 -13- 200901259 面圖。 在第4(a)圖和第5(a)圖中，當可動接點2a, 2b 脫離固定接點4a，4b時’可動件保護蓋6的凸部6a與夾 具1的面相接，抑制可動件3以可動件連接杆5的軸爲中 心回轉。 並且，如第4 ( b )圖和第5 ( b )圖所示，開閉機構 30使得夾具1超過可動接點2a, 2b與固定接點4a, 4b接 觸的位置過回轉，以便使得可動接點2a，2b與固定接點 4a, 4b接觸時，凸部6a和夾具1的面之間空有間隙，使 得可動件保護蓋6的凸部6a離開夾具1的面。並且，若 可動件保護蓋6的凸部6a離開夾具1的凹面，在夾具1 的壁面承受可動件保護蓋6，能允許可動件3以可動件連 接杆5的軸爲中心回轉，能使得可動接點2a, 2b的接通時 間均一化。 又，銷9a, 9b分別插入可動件支撐件7的左右側面， 在夾具1內配置壓接彈簧8a, 8b，以設在夾具1的銷9支 撐壓接彈簧8a, 8b的簧體。從壓接彈簧8a引出兩腳8a’, 8a”，從壓接彈簧8b引出兩腳8b’，8b”，壓接彈簧8a, 8b 的一個腳8a’，8b’掛在夾具1上，壓接彈簧8a，8b的另一 個腳8a”，8b”分別掛在銷9a, 9b上，通過上述壓接彈簧 8a, 8b，分別對可動接點2a, 2b朝固定接點4a，4b方向賦 能，分別給予可動接點2a，2b以接觸壓力。 這樣，能在夾具1內穩定保持可動件支撐件7，且能 使得施加到可動件支撐件7上的力左右對稱，即使可動件 -14- 200901259 3能以可動件連接杆5的軸爲中心回轉場合，也能使得接 觸壓力均等化。 上面參照附圖說明了本發明的實施例，但本發明並不 侷限於上述實施例。在本發明技術思想範圍內可以作種種 變更’它們都屬於本發明的保護範圍。 【圖式簡單說明】 第1圖是表示本發明一實施例涉及的電路斷路器的槪 略構成的縱截面圖。 第2圖是放大表示第丨圖的電路斷路器的夾具1及可 動件3部分的立體圖。 第3圖是放大表示第1圖的電路斷路器的可動件3及 可動件保護蓋6部分的立體圖。 第4 ( a )圖是表示可動接點2a，21)和固定接點4a, 4b 相互脫開時的可動件保護蓋6狀態的縱截面圖，第4(b) 圖是表示可動接點2a，2b和固定接點4a, 4b相互閉合時的 可動件保護蓋6狀態的縱截面圖。 第5 ( a )圖是表示可動接點2a, 2b和固定接點4a，4b 相互脫開時的可動件保護蓋6狀態的橫截面圖，第5 ( b ) 圖是表示可動接點2a，2b和固定接點4a，4b相互閉合時的 可動件保護蓋6狀態的橫截面圖。 第6圖是表示第5圖的壓接彈簧8的裝入狀態的正面 圖。 第7圖是表示以往接通電路斷路器時可動接點的傾斜 -15- 200901259 狀態的正面圖。 第8圖是表示以往的以二對接點實行開閉的電路斷路 器的接點部分的槪略構成立體圖。 【主要元件符號說明】 1 :夾具 2 a，2 b :可動接點 3 :可動件 3a, 3b ：臂 4a，4b :固定接點 5 :可動件連接杆 6 =可動件保護蓋 6a :凸部 7 :可動件支撐件 8 :壓接彈簧 8a, 8a5, 8b, 8b5 ：腳 9, 9a，9b :銷 l〇a :連接導體 10b :電源端子 1 1 :殼體 1 2 :負載側端子 1 3 :開閉手柄 1 4 :手柄杆 15 :第一連杆 -16- 200901259 1 6 :開閉彈簧 1 7 :第二連杆 1 8 :觸發器銷 1 9 :閂鎖件 20 :閂鎖件回轉軸 2 1 :側板 2 2 :連杆止動件 23 :閂鎖件座 24 :閂鎖件座回轉軸 25 :跳閘橫杆 2 6 :橫杆回轉軸 27 :過流跳閘裝置 3 0 :開閉機構 -17At both ends of the 5-7, the two fixed contacts 54 are bridged, the front end of the good arm 60, and the two ends of the yoke contact head 57 are slidable in the direction of the 'bridge contact head forming the contact arms 57c, 57d' From the base body 200901259, the ends of the conductor 57a project toward each other, and the movable contacts 58, 59 are fixed to the front ends of the contact arms 57c, 57d, respectively, and a connection hole 57b is formed in the central portion of the base conductor 57a. Further, the movable contact arm 60 is inserted into the connecting hole 57b to be freely rotatable, and at the same time, the square rod of the movable contact arm 60 is brought into contact with the connecting hole 57b, thereby functioning as a stopper. Further, the movable contacts 58, 59 can be freely rotated before the collision with the stopper, and can be prevented even if the thickness of the movable contacts 58, 59 and the thickness of the fixed contacts 54, 56 are different from each other due to consumption or the like. One of the movable contacts 5, 5 9 and the fixed contacts 54, 56 are not in contact, causing poor conduction. Patent Document 1: Japanese Laid-Open Patent Publication No. 1-2 73 53 No. 6. However, in the method disclosed in Patent Document 1, the movable contact points 58, 59 are freely rotatable when they are in contact with the stopper, and therefore, the movable contacts 5, 59 are sometimes separated from the fixed contacts 54, 56. In the state, the bridge contact 57 is rotated. Therefore, there is a problem that when the circuit breaker is turned on, the bridge contact 5 7 is kept inclined toward one of the left and right sides, and only one of the movable contacts 5, 5 9 is first brought into contact with the fixed contact 54 or 56, and is turned on. The time is deviated, and the opening and closing load is concentrated on the movable contact 58 or 59. Therefore, there is a problem that the movable contact 58 and 59 are damaged or fall off. Further, the slanting bridge contact head 57 returns to the horizontal slewing force. Therefore, there is a problem that the angles of the fixed contacts 54, 56 are easily detached. Figure 7 is a front view showing the tilt state of the movable contact when the circuit breaker is turned on. In Fig. 7, in the circuit breaker, 'the connection conductor 1〇3 and the power terminal lb' fixed contact 4a are joined to the front end of the connection conductor 10a, -6-200901259 fixed contact 4b and power supply The distal end of the terminal i〇b is provided with a movable member 3, and two arms are provided at both ends thereof. The movable contact 2 is joined to the distal end of the pair of arms; and the fixed contacts 4a and 4b are opposed to each other. Further, the movable member 3 is rotatably supported by the jig 1 in a rotatable shaft ′. Further, in the configuration of Fig. 7, in the state of the movable contact 4a, 4b, the mover 3 may be rotated about the movable side. Therefore, when the circuit breaker is turned on, it is tilted toward the left and right, and only the movable contacts 2a, 2b are contacted by the fixed contacts 4a, 4b, causing the movable contacts 2a, 2b to fall off the corners of the fixed contacts 4a, 4b. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described prior art. It is an object of the invention to provide a circuit breaker that can improve the opening and closing load of two pairs of contacts and at the same time improve the circuit breaker. In order to achieve the above object, a circuit breaker according to the application is characterized in that: a pair of fixedly disposed pair of arms arranged to face each other; a pair of movable ends at the ends of the arms can be respectively fixed to the above The pick-up movable member support member 'blocks the movable member from rotating around the shaft; the clamp is for supporting the above-mentioned movable contact to be fixed toward the above-mentioned fixed contact@$. Further, a pair of I, 2b disposed in the opposite direction of the circuit is separated from the fixing member connecting rod 5 by 2a, 2b from the shaft of the fixing member connecting rod 5, and the movable member 3 is held in one of the first to be damaged or detached. Or the problem of the contact point of the contact point of the opening and closing contact point; the movable member, the contact point, respectively, the fixed member support between the pair of arms, the rotation The opening and closing machine 200901259 is configured to drive the movable member to open and close; the stopper, before the movable contact contacts the fixed contact, to suppress the movable member from rotating about an axis between the pair of arms, the movable contact After at least one of the contacts is in contact with the fixed contact, the movable member is allowed to rotate about the axis between the pair of arms. Thus, in the state where the movable contact is separated from the fixed contact, the movable member can be prevented from rotating around the axis between the pair of arms of the movable member, even when the thickness of the movable contact and the thickness of the fixed contact are different from each other due to consumption or the like. It also enables the movable contacts to reliably contact the fixed contacts. Therefore, even when the two pairs of contacts are opened and closed, it is possible to prevent one of the movable contacts from coming into contact with each other and causing the conduction failure, and to improve the contact stability of the contact, and to prevent the movable member from tilting to the left and right. Only one of the movable contacts can be in contact with the fixed contact first, and the movable contact can be prevented from being damaged or the corner of the fixed contact falling off. Further, the circuit breaker according to the second aspect of the invention, wherein the present invention includes a movable member protection cover attached to the movable member, and a convex portion is formed on the movable member protective cover as the stopper, When the movable contact is separated from the fixed contact, the convex portion abuts against the clamp surface; the opening and closing mechanism causes the clamp to rotate excessively to exceed a position at which the movable contact contacts the fixed contact, so that the movable contact and the above When the fixed contact is in contact, there is a gap between the convex portion and the clamp surface. In this way, the structure of the circuit breaker can be suppressed from being complicated, and the contact load that can be opened and closed by the two pairs of contacts can be made uniform, and the contact between the contacts can be improved, and the circuit breaker can be prevented from being enlarged and expensive. Can improve the durability of high circuit breakers -8- 200901259. Further, the circuit breaker according to claim 3, wherein a rotation center that rotates the movable contact toward the fixed contact is provided on the movable member support member, and is provided for the movable member The pushing means of the support member is pushed to give the contact pressure to the movable contact point. When the movable contact is in contact with the fixed contact, the movable contact can be pushed toward the fixed contact even if the movable member can be a pair When the axis between the arms is centered, the contact pressure can be equalized. The circuit breaker of claim 4, wherein the spring pushing means is provided with: a pin 'inserted into the left and right side faces of the movable member support member; and a crimping spring' disposed in the jig and passed through the foot Hanging on the above pin, the contact pressure is given to the movable contact. Thus, the movable member support member can be stably held in the jig, and the force applied to the movable member support member can be bilaterally symmetrical, and the contact pressure can be equalized even if the movable member can be rotated about the axis between the pair of arms. . The effects of the present invention will be described below. As described above, according to the present invention, even when the opening and closing are performed at the two pairs of contacts, it is possible to prevent the one movable contact from coming into contact with each other, thereby causing the conduction failure, thereby improving the contact stability reliability of the contact and preventing the tilting of the movable member. In one of the left and right states, only one of the movable contacts is in contact with the fixed contact first, and the movable contact can be prevented from being damaged or the corner of the fixed contact falling off. [Embodiment] -9-200901259 A circuit breaker according to an embodiment of the present invention will be described in detail below with reference to the drawings. In the following embodiments, the constituent elements, the types, the combinations, the shapes, the relative arrangements, and the like are variously limited. However, these are merely examples, and the present invention is not limited thereto. 1 is a longitudinal cross-sectional view showing a schematic configuration of a circuit breaker according to an embodiment of the present invention, and FIG. 2 is an enlarged perspective view showing a portion of a jig 1 and a movable member 3 of the circuit breaker of FIG. The figure is a perspective view showing, in an enlarged manner, a portion of the movable member 3 and the movable member protective cover 6 of the circuit breaker of Fig. 1. In the first to third figures, in the circuit breaker, a connection conductor 10a and a power supply terminal lb fixed to the casing 1 are provided, and the front end of the fixed contact 4a and the connection conductor 10a is fixed. The joint, the fixed contact 4b is engaged with the front end of the power terminal lb. Further, the circuit breaker is provided with a movable member 3, and a pair of arms 3a, 3b disposed opposite to each other are provided at both ends thereof, and the movable contacts 2a, 2b are joined to the distal ends of the pair of arms 3a, 3b, so that They are respectively opposed to the fixed contacts 4a, 4b. Further, in the center of the movable member 3, the movable member connecting rod 5 is connected so as to protrude toward the opposite side of the arms 3a, 3b, and the movable member 3 is rotatably supported by the movable member connecting rod 5 as a rotary shaft, and is supported by the movable member. Piece 7 support. Further, the movable member support member 7 is assembled to the jig 1 as an insulator which is supported to be rotatable by the opening and closing shaft. On the lower surface side of the movable member 3, a movable member protection cover 6 extending toward the side of the movable member connecting rod 5 is attached, and the movable member protection cover 6 covers the lower portion of the movable member connecting rod 5 from both sides, and at the same time, the movable member protection cover 6 The bottom surface is formed with a convex portion-10-200901259 6a When the field movable contact 2a, 2b and the fixed contact 4a, # are disengaged, the convex portion 6a is in contact with the surface of the jig 1. Further, the circuit breaker is provided with the opening and closing mechanism 30, and the opening and closing operation of the movable member 3 is performed between the fixed contacts 4a and 4b, and the opening and closing mechanism 3 can be driven by the opening and closing shaft integrated with the jig 1 as a fulcrum. After the opening and closing of the device 3, there is a 'tripping mechanism and an overcurrent trip device 27 in the circuit breaker, the trip mechanism cancels the locking of the opening and closing mechanism 3〇, and the overcurrent trip device 27 detects the overcurrent to cause the above tripping Institutional action. Here, the bimetal 'heating conductor' armature and electromagnet are assembled in the overcurrent trip device 27. 'According to the detection result of the overcurrent flowing through the load side terminal 12, it can be driven by a thermal or electromagnetic type. Flexed. Further, the trip mechanism transmits the mechanical deflection generated by the overcurrent trip device 27 to the opening and closing mechanism 30 via the trip rail 25, and the locking of the opening and closing mechanism 30 can be released. The opening and closing handle 13 is coupled to the handlebar 14 and assembled to interlock the handlebar 14 with the opening and closing handle 13. A side plate 21 for supporting the opening and closing mechanism 30 is provided in the circuit breaker, and a swing center is provided on the side plate 21, and the handle bar 14 swings freely with the lever shaft as a fulcrum. The handle lever 14 is connected to the end of the opening and closing spring 16, and the other end of the opening and closing spring 16 is connected to the trigger pin 18. A trigger mechanism composed of a first link 15 and a second link 17 is provided in the circuit breaker. The first link 15 and the second link 17 are connected to each other by a trigger pin 18, the first link The upper end of the 15 is connected to the question lock 19, and the second link 17 is connected to the clamp 1. The opening and closing spring 16' is formed by a tension spring. The lower end hook portion of the opening and closing spring 16 is hung on the trigger pin 18. ' -11 - 200901259 The upper end hook portion of the closing spring 16 is hung on the upper end of the handle lever I#. Here, the trigger mechanism and the opening and closing spring 16 may constitute an opening and closing mechanism 3' of the circuit breaker through the opening and closing operation of the handlebar 14 so that the direction of action of the opening and closing spring 16 is reversed, and the driving jig 1 is opened and closed, and at the same time, The release of the latch i9 is reversed so that the action of the opening and closing spring 16 with respect to the trigger mechanism is reversed, and the clamp 1 can be driven to open and close. A link stopper 22 is provided on the side plate 21, which comes into contact with the trigger pin 18, so that the trigger mechanism is stopped at a predetermined position. Further, a latching member 1 9 ' is provided in the circuit breaker to be rotatably supported by the latching member rotary shaft 20 as a fulcrum, and a latching member seat 2 3 and a trip rail 2 5 are provided. The lock housing 2 3 is configured to be engageable with the latch member 19, and the trip rail 25 is configured to be coupled to the latch housing 23. Here, the 'latch member 19 is configured to be rotatable about the latch member rotary shaft 20, and the latch member seat 23 is configured to be rotatable about the latch member seat rotary shaft 24, and the trip rail 25 is configured to be able to be wound around the crossbar The shaft 26 is rotated. Further, the handle lever 14 that is interlocked with the opening and closing handle 13 and the trigger mechanism that opens and closes the elastic member 16 are driven by the opening and closing operation of the opening and closing handle 13 in the left-right direction. Further, the movable member 3 connected to the jig 1 is rotated together with the jig 1, and the movable contacts 2a, 2b are in contact with or detached from the fixed contacts 4a, 4b, thereby enabling a closing or opening operation. Here, the opening and closing mechanism 30 can make the jig 1 over-rotate at a position where the movable contact 2b contacts the fixed contacts 4a, 4b, so that when the movable contacts 2a, 2b are in contact with the fixed contacts 4a, 4b, the convex portion 6a There is a gap between the concave surface of the fixture i and the concave surface of the fixture i. -12- 200901259 and 'When the movable contacts 2a, 2b are separated from the fixed contacts 4a, 4b, the convex portion 6a of the movable member protection cover 6 is in contact with the surface of the jig 1, and the movable member 3 is restrained by the movable member connecting rod 5 When the movable contact 2a, 2b is in contact with the fixed contact 4a, 4b, the convex portion 6a of the movable member protection cover 6 is separated from the surface of the clamp 1, and the movable member 3 can be allowed to connect the shaft of the rod 5 with the movable member. Rotate for the center. Thus, 'the movable contacts 2a, 2b are separated from the fixed contacts 4a, 4b' can prevent the movable member 3 from rotating around the axis of the movable member connecting rod 5, and at the same time 'even when the movable contacts 2a, 2b are thick and fixed When the thickness of the contact 4a is different from each other due to consumption, the movable contacts 2a, 2b can be reliably brought into contact with the solid contacts 4a, 4b. Therefore, even when the two pairs of contacts are opened and closed, it is possible to prevent one of the movable contacts 2a, 2b from coming into contact with each other and causing a conduction failure, which improves the contact stability of the contact, and prevents the movable member 3 from tilting. In the left and right states, only one of the movable contacts 2a, 2b comes into contact with the fixed contact first, and the movable contacts 2a, 2b can be prevented from being broken or the corners of the fixed contacts 4a, 4b falling off. 4( a) is a longitudinal cross-sectional view showing the state of the movable protective cover 6 when the movable contacts 2a, 2b and the fixed contacts 4a, 4b are disengaged from each other, and the fourth (b) is a movable contact 2a. 2b and the fixed contact 4a, 4b when the mutual closing of the movable member s vine cover 6 state of the longitudinal section '5 (a) is shown when the movable contact 2a, 2b and the fixed contact 4a, 4b are separated from each other Cross-sectional view of the state of the movable member protection cover 6 'Fig. 5 (b) is a cross-sectional view showing the state of the movable member protection cover 6 when the movable contact 2 a, 2b and the fixed contact 4a, 4b are closed to each other Fig. 6 is a front view showing the loading state of the crimp spring 8 of Fig. 5 in the positive-13-200901259. In the fourth (a) and fifth (a) drawings, when the movable contacts 2a, 2b are separated from the fixed contacts 4a, 4b, the convex portion 6a of the movable member protective cover 6 is in contact with the surface of the jig 1, suppressing The movable member 3 is rotated about the axis of the movable member connecting rod 5. Further, as shown in Figs. 4(b) and 5(b), the opening and closing mechanism 30 causes the jig 1 to overturn the position where the movable contact 2a, 2b contacts the fixed contact 4a, 4b so as to make the movable contact When 2a, 2b comes into contact with the fixed contacts 4a, 4b, a gap is formed between the convex portion 6a and the surface of the jig 1, so that the convex portion 6a of the movable member protection cover 6 is separated from the surface of the jig 1. Further, when the convex portion 6a of the movable member protection cover 6 is separated from the concave surface of the jig 1, the movable member protection cover 6 is received on the wall surface of the jig 1, and the movable member 3 can be allowed to rotate around the axis of the movable member connecting rod 5, thereby making it movable. The on-times of the contacts 2a, 2b are uniform. Further, the pins 9a, 9b are respectively inserted into the left and right side faces of the mover support 7, and the pressure springs 8a, 8b are disposed in the jig 1, so that the pin 9 provided in the jig 1 supports the springs of the pressure springs 8a, 8b. The two legs 8a', 8a" are taken out from the crimping spring 8a, and the two legs 8b', 8b" are taken out from the crimping spring 8b, and one leg 8a', 8b' of the crimping springs 8a, 8b is hung on the jig 1, crimped The other legs 8a", 8b" of the springs 8a, 8b are respectively hung on the pins 9a, 9b, and the movable contacts 2a, 2b are energized toward the fixed contacts 4a, 4b by the crimping springs 8a, 8b, respectively. The movable contacts 2a, 2b are respectively given to contact pressure. Thus, the movable member support member 7 can be stably held in the jig 1, and the force applied to the movable member support member 7 can be made bilaterally symmetrical, even if the movable member 14-200901259 3 can be centered on the axis of the movable member connecting rod 5. In the case of turning, the contact pressure can also be equalized. The embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the scope of the technical idea of the present invention, and they all fall within the protection scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal cross-sectional view showing a schematic configuration of a circuit breaker according to an embodiment of the present invention. Fig. 2 is a perspective view showing, in an enlarged manner, a portion of the jig 1 and the movable member 3 of the circuit breaker of the second drawing. Fig. 3 is a perspective view showing, in an enlarged manner, a portion of the movable member 3 and the movable member protective cover 6 of the circuit breaker of Fig. 1. Fig. 4(a) is a longitudinal sectional view showing the state of the movable member protection cover 6 when the movable contact 2a, 21) and the fixed contact 4a, 4b are separated from each other, and Fig. 4(b) is a view showing the movable contact 2a. 2B and a longitudinal cross-sectional view showing the state of the movable member protection cover 6 when the fixed contacts 4a, 4b are closed to each other. Fig. 5(a) is a cross-sectional view showing the state of the movable protective cover 6 when the movable contacts 2a, 2b and the fixed contacts 4a, 4b are disengaged from each other, and Fig. 5(b) is a view showing the movable contact 2a, A cross-sectional view of the state of the movable member protection cover 6 when 2b and the fixed contacts 4a, 4b are closed to each other. Fig. 6 is a front elevational view showing the state in which the crimp spring 8 of Fig. 5 is mounted. Fig. 7 is a front elevational view showing the state of the tilt of the movable contact -15-200901259 when the circuit breaker is turned on in the past. Fig. 8 is a perspective view showing a schematic configuration of a contact portion of a conventional circuit breaker that is opened and closed by two pairs of contacts. [Main component symbol description] 1 : Fixture 2 a, 2 b : Movable contact 3 : Movable member 3a, 3b : Arm 4a, 4b : Fixed contact 5 : Movable member connecting rod 6 = Movable member protective cover 6a : Projection 7: movable member support member 8: crimp springs 8a, 8a5, 8b, 8b5: feet 9, 9a, 9b: pin l〇a: connecting conductor 10b: power terminal 1 1 : housing 1 2 : load side terminal 1 3 : opening and closing handle 1 4 : handle lever 15 : first connecting rod - 16 - 200901259 1 6 : opening and closing spring 1 7 : second connecting rod 18 : trigger pin 1 9 : latching member 20 : latching member rotary shaft 2 1 : side plate 2 2 : link stopper 23 : latch seat 24 : latch seat rotation shaft 25 : trip bar 2 6 : cross bar rotation axis 27 : overcurrent trip device 3 0 : opening and closing mechanism -17