Abstract: A self-mobile gantry frame has disposed thereon a trolley suspending a load lifting frame. The load lifting frame is stabilized against sway in a direction perpendicular to the gantry beam by a stabilizing beam selectively engageable with the load lifting frame.

Abstract: An apparatus is disclosed for stabilizing against sway a body suspended by cables from an overhead support. The apparatus includes first and second opposed rigid stabilizing members pivotally connected at their lower ends to the body, guides carried by the overhead support for guiding the upper ends of the stabilizing members for pivotal and longitudinal movement relative to the overhead support and force transmission means interconnecting the stabilizing members for transmitting forces therebetween so as to generate substantially equal and opposed forces for stabilizing the body against sway, without interfering with the raising and lowering of the body by the suspension cables. This abstract is not to be construed in any way to define or limit the invention set forth below.