Crane, preferably a derrick crane

摘要

The present invention is directed to a crane, preferably a derrick crane, having a traveling chassis (1), a revolving superstructure (2) mounted thereon in rotating fashion and connected with a ballast car (6) by a shaft (3) and on which a boom and a derrick, to which the ballast car (6) is connected, are mounted in luffing manner. The shaft (3) is in the form of a telescoping beam that can be telescoped to a length corresponding to the current load or that is longer than the same.