Abstract: An engine balancer including a driving gear, a driving shaft, a driven gear, and a gear pair formed by interlocking the driving gear with the driven gear, wherein the driving gear is engaged with the driven gear, and the engine balancer further includes a fixing member to elastically fix the driving gear onto the driving shaft.

Abstract: A crane having a fixed mast and a boom pivotally mounted at the top of the mast for movement in a horizontal plane through at least 180.degree. and in a vertical plane downwardly from the horizontal plane at any position of the boom relative to the vertical axis of the mast, a load carrying trolley movable along the length of the boom, hydraulic means located at the top of the mast controlling the movement of the boom in the horizontal plane and hydraulic means between the boom and the mast controlling movement of the boom in the vertical plane.

Abstract: A travelling gantry crane is mounted for movement along rails laid on the weather deck of a ship, but is adaptable for shore installations. Preferably two similar cranes are used in face-to-face arrangement and operable together as a unit for maximum lifting capacity, but they can be operated individually. Each travelling gantry crane has a pair of C-shaped leg members supporting between them a bridge girder, the leg members being movable by driven wheels. A shuttle girder is mounted for movement along the outward facing side of the bridge girder to provide for maximum outreach beyond the ends of the bridge girder. A load carrying trolley moves along the outward facing side of the shuttle girder remote from the bridge girder. The invention includes various detailed arrangements for moving the shuttle girder and the trolley, for securing the gantry crane on the rails, etc.