Abstract: A jib assembly displaceably attached to an articulated boom comprising an elongated jib member having an attachment sleeve element secured thereto. A planetary gear reducer having a driving element, is coupled to a gear train and securable inside the boom. The gear train has an output drive gear protruding adjacent a side wall of the boom. A drive gear coupling element is secured to the jib attachment sleeve and in toothed engagement with the output drive gear for rotatably connecting the sleeve element closely spaced to the boom side wall to reduce stress on the gear coupling caused by the load associated with the jib assembly. Also, stress is reduced on the bucket support shaft associated with said boom by providing a closer spacing of the bucket to the boom.

Abstract: A hydraulic pivot device for pivotally connecting a support housing to a boom of the type secured to a vehicle. The hydraulic pivot device comprises a main housing having a gear-engaging piston which is axially displaceable in a piston cylinder provided therein. The piston has opposed piston heads and is sealingly displaced placed in the piston cylinder by fluid pressure applied at a selected one of opposed ends of the piston cylinder. The piston is also positively interlocked by the use of lock valves which are port-mounted at each end of the piston cylinder. A drive shaft having a drivable pinion gear is supported within the housing with a drivable pinion gear being in toothed engagement with a toothed section of the piston so that axial displacement of the piston wall impact axial rotation to the drive shaft.