| 摘要 |
The invention relates to a fastening or clamping device comprising a fastening or clamping element, for example a screw or a nut, and an operating knob connected with the fastening or clamping element. In order to prevent undue operation of the fastening or clamping element the fastening or clamping device according to the invention comprises a locking device (32), which is changeable between two different positions. In the first of these positions the locking device unrotatably fixes the operating knob (22) in relation to the fastening or clamping element (20) so that said element can be rotated by means of the operating knob. In the second of said positions the locking device allows the operating knob to be unobstructedly rotated in relation to the fastening or clamping device so that it is not possible to operate the fastening or clamping element by means of the operating knob. |
