| 摘要 |
<p>The invention relates to a fixing device for hollow frames and plate surfaces, comprising an externally threaded bolt piece (3) and an internally threaded nut piece (5) provided to be inserted through a hole (6) in a hollow frame or plate surface, whereas an intermediate blocking means (4) prevents said nut piece (5) from rotating when screwing said bolt piece (3) into said nut piece (5), wherein said internally threaded nut piece (5) comprises expandable parts (12), and said intermediate blocking piece (4) is provided to cooperate to expand said expandable parts (12) when screwing said bolt piece (3).</p> |
