| 摘要 |
1. Quick tightening device for joining two or several structural members, e.g. profiled sheets, each having a through hole, comprising a bolt (1) provided with a head (2), and a sleeve-shaped tightening element (3) fastenable on the bolt, with at least one thread (4) being provided at the end of the bolt, which thread begins at a longitudinal groove (5) parallel to the axis and terminates in circumferential direction before the next longitudinal groove, the tightening element having a corresponding radially inwardly protruding projection (7) for each longitudinal groove, after insertion into the longitudinal groove (5) said projection being turnable into the thread (4) and in the tightened position being pressed against the flank (6) of the thread (4) to engage in a depression of the thread (4), characterized in that each projection (7) has a surface region (10) differently shaped in respect of the flank (6) of the thread (4), in the tightened position said surface region pressing said depression in the form of a selve into the flank (6) of the thread (4). |
