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2. 发明授权

US5877670A Heat motor operated load regulating switch assembly and knob attachment therefor 失效
标题翻译：热电动机负载调节开关组件和旋钮附件
公开(公告)号：US5877670A
公开(公告)日：1999-03-02
申请号：US851191
申请日：1997-05-05
申请人： Scott B. Sehlhorst , Stephen Schamberger
发明人： Scott B. Sehlhorst , Stephen Schamberger
IPC分类号： H01H37/14 , H01H37/18 , H01H37/32 , H01H61/013 , H01H61/06 , H01H89/04 , H05B1/02 , H01H37/02 , H01H37/52
CPC分类号： H01H37/14 , H01H37/32 , H01H61/063 , H01H89/04 , H05B1/0213 , H01H37/18 , H01H61/013
摘要： A user adjustable switching controller for duty cycle regulating flow of current to an electrical load such as a resistance heater, particularly for cooking appliances. A load current switch, when closed by a user operated cam also energizes a heat motor which includes a resistive strip attached to one active leg of a U-shaped bi-metal member. In one embodiment the integrally formed load current switch snap spring is securely attached to the heated leg of a U-shaped bi-metal and the moveable contact arm pivoted on the base. The other leg of the U-shaped bi-metal is anchored to a base including one of the load-connecting stationary terminals; and, the anchored leg serves to provide ambient temperature compensation. In another embodiment, the integrally formed blade spring of the moveable contact member is pivoted on the active leg of the U-shaped bi-metal and the moveable contact arm welded to the base. User rotation of the cam deflects a bias spring which acts on the portion of the bi-metal attached to the load switch snap spring to effect closing of the load current switch and energization of the heat motor. Heating of the bi-metal causes warpage which overcomes the bias spring to open the load switch and shut off the heat motor. Cooling of the bi-metal allows the load current switch to re-close repeating the cycle. User adjustment of the cam varies the bias on the snap spring and thus the re-open point of the switch with respect to the cycle, thereby varying the ratio of "on" to "off" time of the load current. The heat motor sub-assembly including the base with the load connecting terminal, the U-shaped bi-metal, the heater and the moveable contact arm and heater connecting chip is pre-fabricated and installed in the controller housing as a unit.
摘要翻译：用户可调节的开关控制器，用于调节电流流向诸如电阻加热器之类的电负载的电流的流量，特别是用于烹饪器具。负载电流开关在由用户操作的凸轮关闭时也为热电机通电，该电动机包括附接到U形双金属构件的一个活动腿的电阻带。在一个实施例中，整体形成的负载电流开关卡扣弹簧牢固地附接到U形双金属的加热腿部，并且可移动接触臂在基座上枢转。 U形双金属的另一支脚固定到包括负载连接固定端子之一的基座上; 并且，锚固腿用于提供环境温度补偿。在另一个实施例中，可移动接触构件的整体形成的叶片弹簧在U形双金属的活动腿和焊接到基座的可动接触臂上枢转。凸轮的用户旋转使偏置弹簧偏转，该偏置弹簧作用在连接到负载开关卡簧上的双金属部分上，以实现负载电流开关的闭合和热电机的通电。双金属的加热导致翘曲，克服偏压弹簧以打开负载开关并切断热电机。双金属的冷却允许负载电流开关重复重复循环。凸轮的用户调节会改变弹簧弹簧的偏压，从而改变开关相对于循环的重新开启点，从而改变负载电流的“接通”与“关闭”时间的比例。包括具有负载连接端子的基座，U形双金属，加热器和可动触点臂和加热器连接芯片的热电机子组件被预制并作为一个单元安装在控制器外壳中。

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