| 摘要 |
A toothed eccentric grounding wheel is freely rotatably supported on the conventional grounding screw of the safety grounding circuit of a grounding electrical device and is arranged upon its rotation in a predetermined direction along a noncircular path to cam with an inner portion of a grounded metal box. The wheel is provided with peripheral teeth which upon such camming of the wheel engage with and firmly dig into the end wall of the box such as to effect a high-pressure grounding contact between the grounding screw and the box.
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