Abstract: A section for a telescopically extensible crane is octagonal in cross-section. The section has relatively thick upper and lower parallel plates, and side members each having a part inclined outwardly for each of the upper and lower plates and a central part generally perpendicular to the upper and lower plates. The central part of each side member may extend over more than half the height of the boom section and the inclined sections may be of differing lengths and thus inclined at different angles to the respective upper and lower plates. Preferably, the lower inclined sections are shorter than the upper inclined sections. The boom section may be reinforced by external belts, or by internal support plates.

Abstract: A rough terrain mobile crane in which the operator's control cab is mounted on a rotatable superstructure has all the controls grouped in the cab including a mechanical, preferably power assisted, steering system mechanically engagable when the cab is in a road travel position, an hydraulic steering system is alternatively engageable for on-site use and includes a separate directional control valve for steering road wheels on one of the axles, and utilizing the power assisted part of the mechanical steering.

Abstract: A rough terrain mobile crane in which the operator's control cab is mounted on a rotatable superstructure has sets of controls for vehicular drive, steering, lifting and boom motions grouped together in the control cab which is carried on a bearing provided on the superstructure together with the boom and pivotally connected hydraulic ram for raising and lowering it and the control cab is alternatively extended to a forward position at the front of the chassis and which may be beside an upstanding engine compartment for driving the crane from place to place and to a rearward position, by sliding and/or pivoting on the bearing, for use in operation of the crane.