| 摘要 |
The apparatus (10) has a stroke module (12) provided with two lifting cylinders (14). A setting unit is provided in arbitrary positions of the lifting cylinders. A transverse part is biased in the lifting cylinders. The setting unit moves along direction of biasing force of the lifting cylinders. The lifting cylinders comprise a biasing force-generating spring. A clamping device determines the lifting cylinders at a casing section of the stroke module. An end (16) of a low pressure grab unit (18) is connected with the lifting cylinders. |
