| 摘要 |
Device for fastening a centrally recessed metal slug by slipping it over a projecting part of an assembly, including a collar or crown-like projection surrounding the central recess and extending from the slug in a direction in which the slug is to be slipped over the projecting part of the assembly, the surrounding projection being engageable with contact regions of the assembly adjacent the projecting part thereof after the slug has been slipped over the projecting part of the assembly, a region of the slug initially set back from the surrounding projection thereof being bringable over the travel path of the slug relative to the assembly, into contact with further contact regions of the assembly and, during mutual travel of the slug and the assembly, regions of the surrounding projection of the slug being shiftable radially inwardly so as to clutch and be clamped to the projecting part of the assembly.
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