Abstract: A lifting arm assembly is movable between a grabbing position and tipping position and includes a static frame provided with a roller arrangement. A dynamic frame is mounted for vertical movement relative to the static frame. A grabber structure is provided with a pair of grabber arms configured for movement between a closed position and an open position. A linkage arrangement has a first end pivotally connected to the dynamic frame, and a second end pivotally attached to the grabber structure. The first end includes a set of teeth arranged in meshing engagement with the roller arrangement on the static frame. Movement of the dynamic frame relative to the static frame causes pivoting of the linkage arrangement resulting in lifting movement of the grabber structure along a curvilinear path between the grabbing position and the tipping position.