CHANGEOVER SWITCH

• Main Author: TAKANO YOSHIHIRO
• Format: Patent
• Language: English; Japanese
• Published: 02.02.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SWITCHES; ELECTRICITY; EMERGENCY PROTECTIVE DEVICES; RELAYS; SELECTORS

To provide a changeover switch that enables an open circuit of a welding contact point with a simple constitution even when a normally closed fixed contact point and a movable contact point are welded together in a C contact point structure for snap-action of the movable contact point using a tension spring.SOLUTION: With a changeover switch, movable contact points 6a, 6b that can be brought into contact with a first fixed contact 1a and a second fixed contact 2a are formed at a tip unit. At a base end unit, a movable contactor 6 in which a contactor fulcrum unit 6c that becomes a fulcrum of rotation by abutting on a support frame 3a is formed and an operation fulcrum unit 7a that becomes a fulcrum of rotation by abutting the tip unit onto a support body provided on an insulation base 4 are formed. An operation piece 7b operated externally is provided with the base end unit. An operation lever 7 in which between the tip unit and the base end unit is rotatably supported in the support frame 3a and a tension spring 8 for connecting a tip end side of the movable contactor 6 and a base end side of the operation lever 7 are provided. With the operation lever 7, a projection 7c for assisting lowering of the movable contactor 6 accompanied by lowering of the operation lever 7 is provided.SELECTED DRAWING: Figure 4 【課題】引張ばねを用いて可動接点をスナップアクションさせるＣ接点構造における常閉の固定接点と可動接点とが溶着している場合であっても、簡易な構成で溶着接点の開路を可能にする切換スイッチを提供すること。【解決手段】先端部に第１固定接点１ａ及び第２固定接点２ａに当接可能な可動接点６ａ，６ｂを形成し、基端部に支持枠３ａに当接して回動支点となる接触子支点部６ｃが形成された可動接触子６と、先端部を絶縁基台４上に設けた支持体に当接して回動支点となる操作支点部７ａが形成され、基端部に外部から操作される操作片７ｂが設けられ、先端部と基端部との間が支持枠３ａ内で回動自在に支持される操作レバー７と、可動接触子６の先端側と操作レバー７の基端側とを接続する引張ばね８と、を備え、操作レバー７には、操作レバー７の下降に伴って可動接触子６の下降をアシストする突起７ｃが設けられる。【選択図】図４