HITCH ATTACHMENT FOR TRACTOR EMPLOYED IN FORESTRY Russian patent published in 2001 - IPC

FIELD: forestry. SUBSTANCE: hitch attachment made in the form of four-link device has pushing frame, upper tie-rods and hydraulic cylinders attached to tractor through brackets, which are interconnected at their upper parts by means of coupling pipe. Double cantilevered upper tie-rods attachment shaft is aligned with hydraulic cylinder attachment shaft and is arranged inside coupling pipe. Ratio of lengths of lower and upper links of four-link device is 1.5-1.70, and ratio of length of lower link to the length of column is 1.24-1.27. EFFECT: simplified construction and enhanced reliability in operation. 2 cl, 2 dwg