DEVICE FOR CHOKERLESS TIMBER SKIDDING Russian patent published in 2017 - IPC B60P3/40 

FIELD: agriculture.

SUBSTANCE: device contains a frame, a grapple with two clamps and a clamp grapple hydraulic cylinder, mounted on the hinged system of a tractor, including the upper and the lower links controlled by the hydraulic cylinder of the hinged mechanism of the tractor, a recuperative system with a hydraulic accumulator. The two additional hydraulic cylinders are provided with spring-loaded rods and are pivotally mounted between the transverse bar of the main frame and the grapple frame, the third additional hydraulic cylinder is pivotally mounted between the hitch of the main frame and the upper end of the double-arm lever pivotally mounted on the transverse bar of the main frame; a track roller is pivotally mounted on the lower end of the two-arm lever with the possibility of its movement in the longitudinal-vertical plane. The piston cavity of the first additional hydraulic cylinder is connected by a hydraulic line to the rod cavity of the second additional hydraulic cylinder, and the piston cavity of the first additional hydraulic cylinder is connected by a hydraulic line to the piston cavity of the second additional hydraulic cylinder. The cavities of the third additional hydraulic cylinder are connected to the distributor and, in addition, are connected to the hydraulic accumulator through check valves and a controlled hydraulic valve.

EFFECT: reducing energy costs while skidding timber, as well as reducing the loads on the structural elements of the device itself and the hinged mechanism and the tractor as well, which increases the reliability and efficiency of the unit.

3 dwg