Excavator etc. with movable jib arm

摘要

At the free end of the jib arm (2) is fitted a working element (4), opposite to which is mounted a grab jaw (6). The working element is swivelable across the jib arm and arrestable in each respective position. The grab jaw is pivotally mounted independently of the working element in its swivel plane.The grab jaw is reciprocally driven w.r.t. the working element. At the side, opposite to the grab jaw, the jib arm has a loosening element (8), protruding into the swivel range of the grab jaw. Pref. the loosening element has a tapered cutting edge.