Patent ID: 8540092

Claim:
Hoisting crane, comprising: a substantially hollow vertical column comprising a foot and a top and a body between the foot and the top, a jib, a jib connection member which is disposed on the column and to which the jib is connected pivotably, an annular bearing structure extending around the column guiding and carrying the jib connection member rotatable about the column, the annular bearing structure comprising: one or more column bearing parts connected to the column, comprising column bearing surfaces associated with the vertical column; and one or more jib bearing parts connected via bolts to the jib connection member, comprising jib bearing surfaces associated with the jib connection member; wherein a first column bearing surface is oriented substantially vertically and is arranged in a radial direction more inwards than a first jib bearing surface arranged opposite the first column bearing surfaces, to support radially inwards directed horizontal loads from the jib connection member to the column; wherein a second column bearing surface is oriented substantially horizontally and is arranged below a second jib bearing surface arranged opposite the second column bearing surfaces to support downwardly directed vertical loads from the jib connection member to the column; and wherein the jib bearing parts and the jib connection member comprise opposite recesses in which one or more splines are provided to connect the jib bearing parts with the jib connection member, in addition to the connection via the bolts.