| 摘要 |
An agricultural apparatus comprises a main frame with ground wheels supporting the frame for movement across the ground and a plurality of ground engaging openers mounted on the frame for engaging the ground. Each opener includes a depth control wheel mounted on the opener frame member for movement in a direction for varying the height of the depth control wheel on the opener frame member to vary the depth of the opener element in the ground. A common adjustment apparatus for all the depth control wheels comprises an actuator, a common drive linkage mounted on the main frame and driven by the actuator and a plurality of individual adjustment members. A cam plate operable by the adjustment member. The depth control wheel is mounted on an arm on which is pivotally mounted on the opener frame member on a first pivot pin, the arm including a portion thereof for engaging the cam plate. Each adjustment member extends generally longitudinally of the respective opener frame member from an upper end adjacent the main frame to a lower end for actuating the depth control wheel, the adjustment member being arranged such that it lies substantially on a line radial to the pivot axis. The pivotal transfer link is pivotally connected to the adjustment member by a second pivot pin and the adjustment member is pivotally connected to the cam plate by a third pivot pin. A distance between the first pivot pin and the second pivot pin is small compared to the distance between the second pivot pin and the third pivot pin.
|
