GRUBBER Russian patent published in 2022 - IPC A01G23/06 

FIELD: machine building.

SUBSTANCE: invention relates to forestry machine building, in particular to uprooting as continuous action for uprooting stumps arranged in parallel rows (forest crops, forest shelter belts and other similar plantations), and positional action, used for uprooting stumps at their chaotic arrangement on clearings and burned areas of natural forests. Lifting device includes a bearing frame, a suspension mechanism, support wheels of the bearing frame, a U-shaped undercutting bracket, posts of the undercutting bracket pivotally connected to the bearing frame, and made in the form of double-arm hydraulically controlled levers, hydraulic cylinders for controlling posts, and rotor for final cleaning of cut stumps and their ejection to soil surface. Rotor is arranged at one end of bearing frame while levers of trimming bracket posts and hydraulic cylinders are arranged at opposite end of bearing frame. At the same time, axes of support wheels of the bearing frame are located between the undercutting bracket and the rotor, and in the vertical plane they are aligned with the centre of gravity of the lifter.

EFFECT: invention will make it possible to reduce traction resistance and increase efficiency.

1 cl, 2 dwg