Patent ID: 7213716

Claim:
Crane with a superstructure ( 4 ) having a forward end and a backward end that rotates on a vertical axle ( 3 ), a boom ( 5 ) coupled to the superstructure ( 4 ) and extending beyond the forward end thereof in such manner that it can luff on a horizontal axle ( 6 ), a luffing device ( 8 , 9 , 10 ) for luffing the boom ( 5 ), and an operating ballast ( 7 ) positioned at the backward end of the superstructure ( 4 ) that counteracts the moment of the boom, and an additional, separate auxiliary erection frame ( 11 ) that is attached, free of guying to the superstructure ( 4 ) and/or the operating ballast ( 7 ) in such manner that it is movable between a first position wherein it projects backward from the luffing device ( 8 , 9 , 10 ) and is connected with an auxiliary erection ballast ( 16 ) for the erection of the boom ( 5 ) and an upward, operating second position wherein it is not connected with the auxiliary erection ballast ( 16 ).