| 摘要 |
A rotary operator for use with an electrical contact block includes a housing having a base portion and a hollow cylindrical extension having external threads on an end opposite the base portion, and a rotatable stem assembly disposed in the base portion and extension. The stem assembly comprises a control knob secured to one end of an intermediate member and a cam member secured to the opposite end. A clamp ring threaded to the extension retains stem assembly in the housing. Multiple position, and more particularly, two and three position cam members having novel camming surfaces are disclosed.
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