| 摘要 |
PURPOSE: An earthing structure for an electric device is provided to improve an electric connection between a mounting nut and a welding bolt in case that the mounting nut is combined with the welding bolt by combining a ring protruded into the mounting nut. CONSTITUTION: A mounting nut is combined into a welding bolt(11). A protrusion ring(30) is a steel member, and combined into an insertion groove(20a) of the mounting nut. In case that the protrusion ring(30) is inserted into the insertion groove(20a), an inner edge of the protrusion ring(30) is protruded to the inner space of the mounting nut. In case that the mounting nut is combined into the welding bolt(11), a protrusion width is enough to enable the inner part of the protrusion ring(30) to stick to the outer part of the welding bolt(11).
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