Abstract: An apparatus for controlling sway and pendulous motion of suspended loads is disclosed which is particularly suited for embodiment in association with a mobile crane or similar hoist system. The arrangement includes stabilizing cables attached to a load lifting structure or spreader of the crane. The stabilizing cable is reeled and unreeled as the load lifting structure is moved up and down, respectively. The reel for the stabilizing cable is connected to a hydraulic motor which is driven by a pressurized fluid source when the load lifting structure is raised to reel in the stabilizing cable reducing and abating any pendulous motion. Upon unreeling of the stabilizing cable and lowering of the load lifting structure, the fluid flow through the hydraulic motor is reversed and directed through bypass circuitry around the hydraulic motor.

Abstract: A counterweight arrangement for mobile vehicles including a pair of transversely spaced support members having notches formed therein. The counterweight has a pair of transversely spaced rod members secured thereto which are selectively received in the notches. A pair of transversely spaced cables are secured to the counterweight to raise and lower the counterweight. The cables are received around corresponding sheaves which may be repositioned to control the movement of the rod members into and out of the notches and around the support members.

Abstract: A heating system for a revolving cab rotatably supported on a support structure which has a heat source. An enclosed space exists between the cab and the support structure and heated air is conducted into the enclosed space. An air duct extends between the revolving cab and the enclosed space and is offset from the axis of rotation of the cab and thus is in constant air-flow communication with the enclosed space and the interior of the cab for directing the heated air from the enclosed space and into the interior of the cab.