TREE SHEAR HEAD AND CONTROLS THEREFOR

摘要

TREE SHEAR HEAD AND CONTROLS THEREFOR A tree shear head includes a shear, a grapple tong and an accumulator tong which are positioned by respective double-acting hydraulic actuators controlled by selectively actuatable solenoidoperated valves such as to place the shear head either in a nonaccumulate mode wherein both tongs operate concurrently to grasp and release trees one-by-one or an accumulate mode wherein the tongs are individually operated in a sequence resulting in the accumulation of a plurality of cut trees.