Lifting unit, luffing jib crane equipped with such a lifting unit, and method for assembling such a crane

摘要

The elevating unit (1) comprises: a jib foot (2) that forms the proximal part of the jib in the operating configuration; a counter jib (4) that supports a ballast (5) that maintains balance; and an elevating unit (1) The fixing part (6) between the jib foot (2) and the counter jib (4) for fixing to the mast (104), and the-jib foot (2) is movable between the lowered position and the raised position. And a cylinder (8) connected to the jib foot (2). The second cylinder part (8.2) is connected to the fixed part (6).