Patent ID: 8919586

Claim:
A substantially hollow jib for a hoisting crane, the jib having a longitudinal axis and a substantially horizontal pivot axis perpendicular to the longitudinal axis comprising: one or more hoisting cable guides; a jib hoisting end; and two jib legs of equal length extending between the substantially horizontal pivot axis and the jib hoisting end, wherein each of the two jib legs comprises one or more hybrid portions comprising two elongated hollow casings substantially parallel to each other and substantially parallel to the longitudinal axis of the jib, wherein between the two casings a truss is provided to rigidly connect the two casings, wherein the two elongated casings are a top hollow casing and a bottom hollow casing, wherein the elongated hollow casings are parallel to a plane defined by the substantially horizontal pivot axis and the longitudinal axis of the jib, wherein a cross section of the hybrid portion mainly perpendicular to the longitudinal axis of the jib is substantially rectangular, wherein the two elongated hollow casings form two opposed sides of the substantially rectangular cross section of the hybrid portion, and wherein the truss is formed by two sets of beams arranged at a distance from each other in a direction parallel to the horizontal pivot axis, each set of beams forming one of the other two opposed sides of the substantially rectangular cross section of the hybrid portion.