| 摘要 |
A soil cultivating implement comprising a row of power-drivable, soil working members supported by a hollow frame extending substantially horizontally perpendicular to the implement's intended direct of operative travel to provide selectively upwardly or downwardly directed forces upon that row via the hollow frame. A supporting ground roller is connected behind the row, its rotary axis being contained in an imaginary vertical plane. A mobile implement provides mass to exert a downward force on the cultivating implement at a coupling point which, in turn, is translated into an upward force on the frame's forward aspect by way of arms and strong pivots, such arms being turnable about the ground roller's rotary axis. The upwardly directed force assists soil-working members automatically to elevate as needed for riding over rocks or other buried obstacles without significant damage. In alternative embodiments, the mass's point of application is adjustable to a location in advance of the imaginary vertical plane whereby the force acting on the frame and soil working members is directed downwardly. This helps to work hard, heavy soils because it facilitates initial soil penetration by the working members and tends to prevent them from riding upwardly from the soil. In another embodiment, the mass comprises weights that are adjustably angularly displaceable around the ground roller's rotary axis to locations spaced at different distances from that axis and either behind or in front of such vertical plane.
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