An articulated boom having two limbs, wherein at least one of the limbs includes a first section, a second section and an electrically insulating connecting piece which connects the first section to the second section and which is rigidly connected to the first section and to the second section. The connecting piece includes glass fibers which are cast with a plastic matrix.

The present invention relates to a system for remote and/or autonomous cutting at least a portion of a harvested ligno trunk, at least a portion of a ligno trunk to be harvested, at least a portion of a ligno trunk during harvesting or at least a portion of a ligno trunk during transporting, said system comprising: a remotely and/or autonomously controlled Unmanned Aerial Vehicle (100), UAV, means for cutting at least a portion of a ligno trunk attachable to said UAV, means for detecting at least a portion of a ligno, means for detecting at least one ligno parameter of at least a portion of a ligno and/or at least one growing condition of at least a portion of a ligno, a base station (120) for communication with said UAV, and means configured for selecting at least one cutting position on at least a portion of a ligno trunk depending on the at least one detected ligno parameter and/or the at least one detected growing condition of at least a portion of a ligno.

The present invention relates to a system (10) for remote and/or autonomous selecting a tree to be harvested and/or to be transported, said system comprising: a remotely and/or autonomously controlled Unmanned Aerial Vehicle (100), UAV, comprising, at least one means for holding (105) and/or harvesting said at least a portion of a tree, means for detecting said a tree to be transported and/or harvested, means for detecting at least one of the group of tree parameters: diameter of said tree, length of said tree, tree species of said tree and/or the weight of said tree, a base station (120) for communication with said means configured for holding (105) and/or harvesting said tree and said UAV (100), and means configured for selecting at least a portion of a tree to be harvested and/or transported depending on at least one of said detected tree parameters.

The present invention relates to a system (10) for remote and/or autonomous selecting a tree to be harvested and/or to be transported, said system comprising: a remotely and/or autonomously controlled Unmanned Aerial Vehicle (100), UAV, comprising, at least one means for holding (105) and/or harvesting said at least a portion of a tree, means for detecting said a tree to be transported and/or harvested, means for detecting at least one of the group of tree parameters: diameter of said tree, length of said tree, tree species of said tree and/or the weight of said tree, a base station (120) for communication with said means configured for holding (105) and/or harvesting said tree and said UAV (100), and means configured for selecting at least a portion of a tree to be harvested and/or transported depending on at least one of said detected tree parameters.

A control system for controlling a moveable device includes at least one hydraulic actuator associated with the moveable device, at least one position sensing device to determine the position of the moveable device or the actuator, or both, and a hydraulic control system, including an electronic control unit, for controlling the actuator. For performing a control method, the hydraulic control system is configured to deliver pressurized hydraulic fluid to the actuator, the hydraulic fluid being pressurized at most to a predetermined maximum pressure, and the control system is adapted to regulate the predetermined maximum pressure based on the determined position. According to an example, the moveable device is a boom of a working machine. According to a further example, the actuator is a hydraulic cylinder or motor.

A control system for controlling a moveable device includes at least one hydraulic actuator associated with the moveable device, at least one position sensing device to determine the position of the moveable device or the actuator, or both, and a hydraulic control system, including an electronic control unit, for controlling the actuator. For performing a control method, the hydraulic control system is configured to deliver pressurized hydraulic fluid to the actuator, the hydraulic fluid being pressurized at most to a predetermined maximum pressure, and the control system is adapted to regulate the predetermined maximum pressure based on the determined position. According to an example, the moveable device is a boom of a working machine. According to a further example, the actuator is a hydraulic cylinder or motor.

The embodiments described herein are directed to a cutting apparatus incorporating anti-pinching and anti-snag structures called anvils in conjunction with cutting means such as a cutting chain or series of circular saw blades. In one embodiment, the cutting apparatus may be incorporated into a cutting head connected to a vehicle by an articulated boom for use as part of an overall limb-cutting apparatus for use in utility or public easements that can prune hundreds of limbs quickly in a single plane, and then process the tree limbs efficiently.

A work machine (1) comprises at least one structural element (21), at least one pressure medium operated actuator 22) for establishing at least one operation of the work machine, and at least one detection device (23) to determine the position of the structural element (21) of the work machine. An arrangement for controlling at least one operation of the work machine (1) comprises: a control valve arrangement (24) for controlling the actuator (22), and a control device (25) for controlling the control valve arrangement (24). The control device (25) is adapted to control said control valve arrangement (24) for adjusting the pressure and/or volume flow on the return line of the actuator (22) as dependent on the position of the structural element (21).

The invention relates to a system for remote and/or autonomous holding at least a portion of a tree trunk, said system comprising: a remotely and/or autonomously controlled Unmanned Aerial Vehicle (100), UAV, at least one remotely and/or autonomously controlled means (105) for holding at least a portion of a tree trunk attachable to said UAV (100), means for detecting at least a portion of a tree, means for detecting at least one tree parameter of at least a portion of a tree and/or at least one growing condition of at least a portion of a tree, a base station for communication with said UAV (100), means configured for directing said means (105) for holding at least a portion of a tree trunk to a particular position of said tree trunk depending on said at least one detected tree parameter and/or said at least one detected growing condition.

Method, apparatus, and system for operation of a timber-working device configured to perform at least one operation having an associated hazard zone. At least one signal from at least one orientation sensor associated with the timber-working head may indicate whether a predetermined location is within the hazard zone based on the orientation of the timber-working head. Operation of the timber-working head can be controlled based on the signal.