| 摘要 |
<p>The crane has a jib (1) in two sections (2,3), a trolley movable along the jib. The trolley has a first wheel for running over a first track and a second wheel for running over a second track. The second running wheel has a switching device which has a lever mechanism operated by a switch and which lifts the second running wheel in the region of the first jib section (2) completely from the crane jib and guides it onto the second track in the region of the second jib section.</p> |
