A work machine extending in a fore-aft direction includes a frame, a ground-engaging mechanism, a boom assembly to the frame, and a traction assist apparatus. The ground-engaging mechanism is configured to support the frame on a surface. The traction assist apparatus is coupled to the boom assembly. The traction assist apparatus has an attachment point for securing a tether.

A method for controlling a movement of a load in a workspace by a control device, including a) acquiring target coordinates to be set of a target point in the workspace towards which a load pick-up apparatus is to be moved, b) determining a load measured value by measuring the weight of the load using a load measuring device, c) determining actual cable lengths of positioning cables, d) determining desired cable lengths to be set by the respective positioning cable winch, for the positioning cables for the target coordinates of the target point to be set and for the current load measured value, and for each of the positioning cables, the control device searches a database for a data set that matches the target coordinates of the target point that are to be set and the current load measured value, and determines the desired cable length to be set.

A method for controlling a movement of a load in a workspace by a control device, including a) acquiring target coordinates to be set of a target point in the workspace towards which a load pick-up apparatus is to be moved, b) determining a load measured value by measuring the weight of the load using a load measuring device, c) determining actual cable lengths of positioning cables, d) determining desired cable lengths to be set by the respective positioning cable winch, for the positioning cables for the target coordinates of the target point to be set and for the current load measured value, and for each of the positioning cables, the control device searches a database for a data set that matches the target coordinates of the target point that are to be set and the current load measured value, and determines the desired cable length to be set.

A skyline log conveying system having a skyline for extending between two elevated supports, one at or above a landing at which logs are deposited and another at a lower position at least as low as an area from which logs are to be moved. A carriage is rollably mounted to the skyline. A grapple is suspended from the carriage, the grapple having closed and opened positions for grasping and releasing logs. A hydraulic pump is mounted to the carriage. A rotatable member is driven by the skyline with the rolling of the carriage on the skyline for driving the hydraulic pump to generate hydraulic pressure. At least one accumulator is in hydraulic communication with the hydraulic pump, the at least one accumulator capable of storing pressure when hydraulic pressure is transmitted to it by the hydraulic pump. A hydraulic ram is hydraulically interconnected with the at least one accumulator and mounted to the grapple to selectively close the grapple to facilitate the grasping of logs.

A skyline log conveying system having a skyline for extending between two elevated supports, one at or above a landing at which logs are deposited and another at a lower position at least as low as an area from which logs are to be moved. A carriage is rollably mounted to the skyline. A grapple is suspended from the carriage, the grapple having closed and opened positions for grasping and releasing logs. A hydraulic pump is mounted to the carriage. A rotatable member is driven by the skyline with the rolling of the carriage on the skyline for driving the hydraulic pump to generate hydraulic pressure. At least one accumulator is in hydraulic communication with the hydraulic pump, the at least one accumulator capable of storing pressure when hydraulic pressure is transmitted to it by the hydraulic pump. A hydraulic ram is hydraulically interconnected with the at least one accumulator and mounted to the grapple to selectively close the grapple to facilitate the grasping of logs.

A support post includes a plurality of rod-like bodies, an annular member that bundles the rod-like bodies, and a base that supports and erects the rod-like bodies bundled by the annular member.

A support post includes a plurality of rod-like bodies, an annular member that bundles the rod-like bodies, and a base that supports and erects the rod-like bodies bundled by the annular member.

A skyline log conveying system having a skyline for extending between two elevated supports, one at or above a landing at which logs are deposited and another at a lower position at least as low as an area from which logs are to be moved. A carriage is rollably mounted to the skyline. A grapple is suspended from the carriage, the grapple having closed and opened positions for grasping and releasing logs. A hydraulic pump is mounted to the carriage. A rotatable member is driven by the skyline with the rolling of the carriage on the skyline for driving the hydraulic pump to generate hydraulic pressure. At least one accumulator is in hydraulic communication with the hydraulic pump, the at least one accumulator capable of storing pressure when hydraulic pressure is transmitted to it by the hydraulic pump. A hydraulic ram is hydraulically interconnected with the at least one accumulator and mounted to the grapple to selectively close the grapple to facilitate the grasping of logs.

A skyline log conveying system having a skyline for extending between two elevated supports, one at or above a landing at which logs are deposited and another at a lower position at least as low as an area from which logs are to be moved. A carriage is rollably mounted to the skyline. A grapple is suspended from the carriage, the grapple having closed and opened positions for grasping and releasing logs. A hydraulic pump is mounted to the carriage. A rotatable member is driven by the skyline with the rolling of the carriage on the skyline for driving the hydraulic pump to generate hydraulic pressure. At least one accumulator is in hydraulic communication with the hydraulic pump, the at least one accumulator capable of storing pressure when hydraulic pressure is transmitted to it by the hydraulic pump. A hydraulic ram is hydraulically interconnected with the at least one accumulator and mounted to the grapple to selectively close the grapple to facilitate the grasping of logs.

A method for controlling a movement of a load in a workspace by a control device, including a) acquiring target coordinates to be set of a target point in the workspace towards which a load pick-up apparatus is to be moved, b) determining a load measured value by measuring the weight of the load using a load measuring device, c) determining actual cable lengths of positioning cables, d) determining desired cable lengths to be set by the respective positioning cable winch, for the positioning cables for the target coordinates of the target point to be set and for the current load measured value, and for each of the positioning cables, the control device searches a database for a data set that matches the target coordinates of the target point that are to be set and the current load measured value, and determines the desired cable length to be set.