| 摘要 |
<p>The present invention relates to an improved mechanical flush-mounted device for application to perforated tiles, comprising a rod (4) having an outer connecting end and defining a first threaded portion (5) having a greater diameter and a second threaded portion (6) having a less diameter arranged at the inner end. On the first and second threaded portions (5, 6)are provided, respectively, a first and second independently radially expandible plugs (21, 22) which can be independently expanded by different axial pressing elements engaging with the threaded portions (5, 6).</p> |
