Patent ID: 7523834

Claim:
Harvester crane comprising a set of booms attached to a chassis by means of a fork-shaped pedestal and rotating device, the fork-shaped pedestal having two opposite sides, the set of booms including a main boom, pivotably connected to the pedestal at its lower end between said two opposite sides by a lower pivot, the lower pivot of the main boom being located adjacent the rotating device; and an articulated boom, which is pivoted by an upper pivot at the opposite end of the main boom and which extends forward from the main boom; operating devices comprising a lift cylinder and a transfer cylinder that operate the booms; and a trapezium mechanism, synchronizing the set of booms, which further includes a drag link disposed parallel to and behind the main boom and having lower and upper ends, a lower arm pivotably connected to the lower pivot of said main boom and the lower end of the drag link, connecting the lower end of the drag link to the lower pivot of the main boom, and the lower arm having an extension on the opposite side of the lower pivot relative to the drag link, and an arm assembly at the upper end of the drag link, connecting the upper end of the drag link operationally to both the main boom and the articulated boom; wherein the lift cylinder being pivotable at one end to the pedestal and at an opposite end to the extension of the lower arm relative to said lower pivot, in which case the lifting of the set of booms takes place by operation of the pushing of the lift cylinder by an expanding work movement, and the lower arm and the lift cylinder are located at least partly between the opposite sides of the pedestal, and the transfer cylinder pivots one end of the lower arm and an opposite end to the main boom, said transfer cylinder being located between the drag link and the main boom.