| 摘要 |
<p>The device has a horizontal support base for receiving a pair of fastening brackets. Another support base (2) is provided with another pair of fastening brackets (8a, 8b) that is arranged in opposite to the former set of brackets. A plate (5) is provided with oblong slots. The two pairs of brackets are formed with openings for a passage of a connecting unit. Top of the plate comprises a horizontal supporting surface for receiving a block. A supporting plane is provided on a width portion of a box, and comprises a bearing zone of a lifting unit.</p> |
