Patent ID: 7178682

Claim:
A traveling crane( 1 ), comprising: a superstructure ( 2 ) structured and arranged to be rotated about an upright axis ( 8 , 19 ) and carrying a crane jib with hoisting means, a truck ( 4 ) having tracklaying gear ( 21 ) that carries the superstructure ( 2 ) for translational movement, and a supporting device ( 3 ) positioned along said upright axis ( 8 , 19 ) between said superstructure ( 2 ) and truck ( 4 ) and having several outriggers ( 14 , 17 ) arranged to be raised and lowered, the superstructure ( 2 ) and truck ( 4 ) being individually rotatable relative to the supporting device ( 3 ) about said upright axis ( 8 , 19 ) and the supporting device ( 3 ) arranged to raise the truck ( 4 ) together with the superstructure ( 2 ) such that the truck ( 4 ) is rotated about said upright axis ( 8 , 19 ) to a new driving direction while said tracklaying gear ( 21 ) is lifted off the ground.