Patent ID: 6679394
Filing Date: 2004-01-20
Classification: B66C

Abstract:
A ring lift crane comprisinga liftable ring forming a circular traveling path and comprising a plurality of segments which can be connected to one another, said ring having a center which forms an axis of rotation, a chassis having a center located on said axis of rotation, reinforcement members connecting said chassis to said ring, a superstructure mounted for rotation on said chassis, said superstructure having two oppositely located end areas provided with respective front and rear adaptors, each said adaptor having rollers which support it for rolling on said circular traveling path, said rear adaptor being constructed to receive a counterweight, and a main boom comprising a lattice mast having a head end, a foot end mounted for articulation about an articulation axis on said front adaptor, a length between said head end and said foot end, a pair of opposite sides, a width parallel to said articulation axis between said sides, and lateral reinforcement for said lattice mast extending along at least half of said length on each of said opposite sides, said lateral reinforcement comprising an anchoring element arranged parallel to said lattice mast on each of said sides, and a pair of connection elements on each side of said lattice mast in each of a plurality of parallel planes extending through said lattice mast transversely of said length, said lattice mast having a cross-member connecting each pair of connection elements to form a triangle.