| 摘要 |
FIELD: electrical engineering.SUBSTANCE: grounding bolt allows electric contact with element coated in insulating film. Bolt has head and threaded rod. It has rim edge to scrape insulating film off made on head bearing surface to surround threaded rod, wherein first circular groove can retain film fragments scrapped off by circular groove and is made in head bearing surface, nearby circular edge outer side. Threaded rod is provided with ledges arranged radially outward from thread tip to scrape off the second insulating film that covers nut internal thread to engage with that of said rod. When grounding bolt is turned for tightening circular edge breaks and removes a part of insulating film for it to make waterproof inside circular edge.EFFECT: ease of use.8 cl, 12 dwg |
