| 摘要 |
The rectangular locking element (4) with two opposite positioned diagonally cut off corners is inserted into the space provided at the hollow profile (3). A ring element (10) surrounding the shaft of a threaded bolt (7) adjacent to the screw head (8) is provided with a control segment (11) guided into one of several recesses (12) located at a stop element (6). When the bolt (7) is rotated the locking element (4) is moved under the downwards pointing segments (17.1, 17.2) of the profile (3) and the control segment (11) engages with another recess (12). |
