| 摘要 |
<p>A hoisting crane (20) has a substantially hollow vertical column (21) with a foot (22) which is or can be fixed to a support, and with a top (23). Furthermore, the hoisting crane has a jib (24) with an associated annular bearing structure (25) which extends around the vertical column and guides and carries a jib connection member (26), so that the jib connection member can rotate about the column, the jib connection member forming a substantially horizontal pivot axis so that the jib can be pivoted up and down.</p><p>Furthermore, the hoisting crane has two winches (35a,35b) and associated hoisting cables for hoisting a load. At the top of the vertical column there is a top cable guide (40), and furthermore there is a hoisting cable guide (43) on the jib of the hoisting crane.</p><p>The winches are disposed in or in the vicinity of the foot of the vertical column, so that the hoisting cable extends from each winch through the hollow vertical column to the top cable guide and then to the hoisting cable guide on the jib.</p><p>The top cable guide comprises a rotary bearing structure, so that the top cable guide can follow rotary movements of the jib about the vertical column and adopt substantially the same angular position as the jib.</p><p>The first hoisting cable (36a) extends diagonally to a first hoisting cable pulley (101) mounted on said right side of the hoisting cable guide on said jib, and the said second hoisting cable (36b) extends diagonally to a second hoisting cable pulley (102) mounted on said left side of the hoisting cable guide on said jib.
</p> |
