| 摘要 |
2148376 9410460 PCTABS00032 A screw (3) is used to join two profiled elements (1, 2). The screw has a drilling part (4), a thread part (5), an unthreaded shank section (15) and a screw head (7). The sum (S) of the length (B) of the drilling part (4) and the length (G) of the thread part (5) is equal to or less than the clearance (W) between two webs (10, 11), following one after the other in the drilling/screw-in direction, of the profiled elements (1, 2) to be joined together. Thus, the process of drilling into web (11) does not begin until the thread part (5) has already exited web (10).
|
