Crane having effectively coincident gantry and boom forces upon an upperstructure

A crane comprising:

• a base;
• an upperstructure rotationally mounted on the base;
• a boom having a proximal end pivotally attached to the upperstructure at a front attachment location and having a distal end supporting a load line operable to raise a payload;
• and
• a gantry mounted on the upperstructure and having an upper end supporting a boom line coupled to the distal end of the boom operable to support the distal end of the boom;
• wherein the gantry includes at least one front leg mechanically coupled to the front attachment location and inclined in a direction away from the boom to apply, to the front attachment location, a horizontal force component towards the boom that is opposed by a horizontal force component applied by the boom towards the front leg;
• and
• wherein the upperstructure includes a frustoconical turret forming an upper circle and a lower circle, and the front attachment location is aligned over the upper circle of the frustoconical turret.