| 摘要 |
A towable agricultural implement, e.g. a direct drilling implement, having a mounting assembly at its forward end which is adapted to be mounted on a lifting mechanism (15, 21) at the rear of a tractor (20), a main frame (17) on which the assembly is mounted, a set of ground wheels for supporting the main frame (17) at a required level above the ground surface which is being traversed by the implement, and a set of soil working tools e.g. seed drills mounted on the frame (17) and arranged to work the soil at required depths below the soil surface: in which the mounting assembly is arranged to transfer part of the weight of the tractor from the fixed upper link (21) of the tractor to the implement main frame (17) so that a downward biasing force is applied to the seed drills with a view to maintaining a substantially constant drilling depth despite undulation in the ground surface; and in which the mounting assembly comprises a rigid front frame (3) secured to the main frame (17) and adapted to be pivotally connected at its lower end to the lower draft links (15) and having an adjustable top link (2) interconnected its upper end (16) to the fixed upper link (21) whereby the ground wheels of the implement set the required working depth of the seed drills, and the link (2) is adjustable to vary the angle of the main frame (17) relative to the ground. Weight transfer from the tractor to the main frame (17) is achieved via a lever arm (1) connected to the fixed upper link (21), a toggle (9) mounted on pivot (28), an actuator rod (8) pivoted to the toggle (9) and a biasing means (6) which transfers the weight load applied to the rod (8) (when the toggle 9 is in the operative position) to an actuator arm (5) and thence to the main frame (17).
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