Oil States Industries Limited

Christopher Paul Chiasson

A crane includes a base, an upperstructure rotationally mounted on the base, a boom, and a gantry. The boom is pivotally attached to the upperstructure at a front attachment location and supports a load line operable to raise a payload. The gantry is mounted on the upperstructure and supports a boom line coupled to the boom. The gantry includes at least one front leg mechanically coupled to the front attachment location and inclined away from the boom to apply, to the front attachment location, a horizontal force component towards the boom opposed by a horizontal force component applied by the boom towards the front leg. The upperstructure includes a frustoconical turret forming an upper circle and a lower circle. The front attachment location is aligned over the upper circle of the frustoconical turret.

Crane having effectively coincident gantry and boom forces upon an upperstructure

A crane includes a base, an upperstructure rotationally mounted on the base, a boom pivotally mounted to the upperstructure at a front attachment location and having a distal end supporting a load line for raising a payload, and a gantry mounted on the upperstructure and supporting a boom line coupled to the distal end of the boom. 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. The upperstructure includes a circular turret, and the front attachment location is aligned over a circle of the turret.

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Houma, LA, United States of America

Christopher Paul Chiasson