| 摘要 |
PCT No. PCT/EP88/00020 Sec. 371 Date Sep. 21, 1988 Sec. 102(e) Date Sep. 21, 1988 PCT Filed Jan. 13, 1988 PCT Pub. No. WO88/05487 PCT Pub. Date Jul. 28, 1988.In the case of an attachment element (1), a large washer (5), and a tubular extension (6) formed thereon, are provided for the passage and guidance of a screw (4). The washer (5) and the tubular extension (6) are in the form of parts made separately from each other. The tubular extension (6) carries, at the end facing the washer (5), a shoulder (7) engaging in a corresponding depression in the vicinity of an opening in the washer (5). The section (8), adjoining the shoulder (7), of the tubular extension (6), can be introduced through the opening in the washer (5). The screw (4) is inserted into the extension (6) before or after the said extension has been inserted into the said washer.
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