| 摘要 |
PCT No. PCT/EP90/02291 Sec. 371 Date Sep. 13, 1991 Sec. 102(e) Date Sep. 13, 1991 PCT Filed Dec. 21, 1990 PCT Pub. No. WO91/11628 PCT Pub. Date Aug. 8, 1991.A rivet fastener includes a threaded spindle having at a free end thereof a drill bit and an external casing having a stop flange and a sleeve portion with an internal thread corresponding to that of the spindle and receiving the spindle. The casing has a plurality of set-breaking grooves extending parallel to the axis of the casing. The threads and the drill bit are formed such that the threads run in a direction opposite to that of a drilling rotation.
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