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11. 发明授权

US4149053A Safety disconnect electric switch 失效
标题翻译：安全断开电源开关
公开(公告)号：US4149053A
公开(公告)日：1979-04-10
申请号：US735691
申请日：1976-10-26
申请人： Eric L. Long
发明人： Eric L. Long
IPC分类号： H01H21/00 , H01H3/00 , H01H19/635 , H01H9/06
CPC分类号： H01H3/001 , H01H19/635 , Y10S200/42
摘要： A trigger switch for portable tools that provides safety disconnect under contact-weld conditions. The switch is a manual close, return spring open, double-snap type wherein the actuator acts on a double-inclined surface of a cam to snap the switch contacts closed or open as the actuator passes the center high point of the cam in one direction or the other. The safety disconnect feature provides in series with the switch contacts a connector biased to flip open that is normally held closed by actuator reactance force on the cam in combination with tripping means therefor. This tripping means includes coacting means between the cam and a contact carrier on which the cam is normally spring-restrained from shifting in the switch opening movement direction of the actuator. If the contacts weld, switch opening movement of the actuator under force of the stored energy of its return spring, and without requiring any additional external force, forcibly shifts the cam to a point allowing it to trip down in the contact carrier and release the connector allowing it to flip open and interrupt the connection permanently.
摘要翻译：用于便携式工具的触发开关，在接触焊接条件下提供安全断开。开关是手动关闭，复位弹簧打开，双扣式，其中致动器作用在凸轮的双倾斜表面上，以在致动器沿一个方向穿过凸轮的中心高点时闭合或打开开关触点或另一个。安全断开功能与开关触点串联连接，该连接器偏置为翻转开口，该连接器通常由与凸轮相关的致动器电抗力保持闭合。该脱扣装置包括凸轮与触头支架之间的共同作用装置，凸轮通常在其上沿着致动器的开关打开移动方向弹簧限制而不能移动。如果触点焊接，则在其复位弹簧的存储能量的作用下切换致动器的打开运动，并且不需要任何额外的外力，将凸轮强制地移动到允许其在触点载体中脱落并释放连接器的点允许它翻转并永久中断连接。

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