Abstract: The present invention relates to a lattice mast crane having a traveling gear, a swiveling crown arranged on the traveling gear and a revolving deck which is rotatable via the swiveling crown and on which a main boom and a derrick boom are arranged and having a ballast box, with the revolving deck being mounted on the swiveling crown via a spacer tube and with the guide frame forming the track of the derrick ballast projecting outwardly beyond the ballast box.

Abstract: A traveling crane including a telescoping boom whose individual telescopically extending boom members are able to be extended and retracted after the disengagement of locking bolt connections using one single stage hydraulic piston and cylinder unit. The boom members are bolted in the respective extended or retracted positions by locking bolts spring-loaded toward the locked setting thereof. The piston rod of the piston and cylinder unit is pivotally attached to the boom joint member terminating the inner end of the outer boom member. An entraining device, which is able to be coupled with a receiving member on the telescopically extending boom members, is arranged in a part of the end of the cylinder, from which the piston rod comes out of the cylinder.