Tree shear actuator restraint - has cables connected between cylinder and frame which supports parallel crankshafts linked to blades

摘要

The tree shear head includes a frame that supports a pair of parallel crank shafts which are respectively linked to a pair of shear blades for moving the latter together into the trunk of a tree. The crank shafts are rotated by means of an actuator including a cylinder in which a pair of piston and rod units are mounted. The rods project oppositely and are respectively connected to the pair of crank shafts. To prevent the cylinder of the actuator from shifting a axially relative to the rods and from rotating on the rods, cables are connected between the cylinder and the frame.