| 摘要 |
<p>The invention relates to a hydraulic lifting apparatus (1) having a lifting arrangement (3, 12), which is vertically adjustable and which is arranged to be turnable about an axis (A). A first hydraulic actuator (16) is arranged to raise and lower the lifting arrangement (3, 12) and a second hydraulic actuator (30, 32) is arranged to turn the lifting arrangement (3, 12) about said axis (A), and both actuators are connected to a common hydraulic pressure source (46, 47). Furthermore, a change-over means (54) is arranged to connect one of said first actuator (16) and said second actuator (30, 32) to said hydraulic pressure source (46, 47). According to one embodiment of the invention, the second actuator is composed of two opposed hydraulic cylinders (30, 32) which have at least one common point of engagement (P1).</p> |
