Patent ID: 7276808

Claim:
A tower ( 40 ) to support a wind-driven power-plant comprising an equipment nacelle ( 30 ) affixed to the tower ( 40 ) and a rotor ( 20 ) resting on the equipment nacelle in a manner to be rotatable about a substantially horizontal axis, said rotor being fitted with at least one rotor blade ( 22 ), said tower comprising an upper, tubular tower segment ( 46 ) which is connected in a transition zone to a lower tower segment ( 41 ) in the form of a lattice tower ( 42 ), said lattice tower comprising at least three corner posts ( 43 ) wherein the upper tower segment ( 46 ) constitutes at least one sixth of the entire tower, and wherein the cross-section of the lower tower segment ( 41 ) underneath the transition zone is larger than the cross-section of the upper tower segment ( 46 ), and in that the transition zone is designed in a manner that the cross-section of the lower tower segment is matched in a force-optimized manner to the cross-section of the upper tower segment.