| 摘要 |
The screw head comprises a tension pin (1), a screw body (2) coupled to the pin, and a casing forming a bottom stop (3). The pin and screw body are movable relatively to each other along the same axis, and have coupling links (8) on their facing end surfaces. Between the pin and screw body is a pressure spring (4). The part of the pin facing the screw body, the body and its associated nut, and the coupling links, are all movably and rotatably located in the casing. At the ends of the casing are limiters (9,10) for the movement of the part (5) of the pin facing the screw body. |
