Patent ID: 8177081

Claim:
A lattice mast crane with a lattice mast boom to be luffed up in a vertical luffing plane, which comprises a pivot piece, a plurality of lattice pieces releasably connectable with each other, and a head piece wherein the lattice mast boom includes a first region and a second region which is longitudinally aligned with the first region, in the first region the lattice mast boom includes two longitudinally extending substantially parallel first strands of interconnected first lattice pieces each said first strands having a proximal end and an opposite distal end, wherein said two first strands are each releasably connected with the pivot piece via a lower cross-beam at their respective proximal ends, and in the second region the lattice mast boom only consists of a longitudinally extending second strand of interconnected second lattice pieces, said second strand having a proximal end and an opposite distal end, said second strand being releasably connected at the distal end to a head piece and at the proximal end to the first strands of lattice pieces via an upper cross-beam at the distal end of the first lattice pieces, wherein said upper cross-beam includes a distal end connected to the second strand and a proximal end connected to the first strands which is wider in a direction perpendicular to the luffing plane than the distal end of the upper cross beam and extends across substantially an entire cross section of both of said first strands, wherein the two substantially parallel first strands each include a middle axis, and the respective middle axes of the two substantially parallel first strands are equidistant from a middle axis of the second strand.