| 摘要 |
1334291 Making self-locking nuts NEDSCHROEF OCTROOI MAATSCHAPPIJ NV 3 Aug 1971 [13 Aug 1970] 36400/71 Heading B3A [Also in Division F2] A self-locking nut is made by flattening a projection on the end of a nut-blank so as to inwardly-deform the adjacent threads. The nut-blank 1, Fig. 14, is pressed with an end projection 2 and is then tapped. A rolling operation follows, Fig. 6, which flattens the projection 2 and modifies the end threads, Fig. 5. The rolls 6, 7 are driven by sprockets, roll 7 being pressed hydraulically towards roll 6. |
