| 摘要 |
A vacuum attachment including a flexible circular expansion plate (1) arranged to be tightened against the edge periphery (8) of a support (2) for forming a vacuum against the underlayer, an expansion means (3) and a tightening device (9), the expansion means (3) being fixedly connected to the expansion plate (1) and formed as a screw secured against rotation, which screw is arranged to be tightened against the support (2) by screwing the tightening device (9) onto the expansion means (3). |
