SECTIONAL FRAME OF AGRICULTURAL TOOL Russian patent published in 1999 - IPC

FIELD: agricultural engineering. SUBSTANCE: frame has pivotally connected central and side sections 1,2,12 connected with central two-link chain. Hydraulic cylinder 8 is coupled with one link of two-link chain. At least one link is equipped with stop 4 for restricting turning of links in prederetermined position of side section 2,12 of frame. Apex of obtuse angle γ defined by links of two-link chain is oriented downward, when section 1,2,12 of frame is in operating position, with pivot hinges of frame being disposed in horizontal position. When central and side sections 1,2,12 of frame are disposed in single plane or in parallel planes, angle γ has minimum value. At maximum declination of side section 2,12 downward angle γ = π has maximum value. Such construction allows all sections of agricultural tool to follow relief of ground. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 3 cl, 3 dwg