| 摘要 |
The invention provides a folding wing disc harrow wherein a hydraulic operating mechanism is provided for folding and unfolding the wings through an arc of more than 180 DEG through the positive bidirectional linear movement of the plunger of a double acting hydraulic cylinder cooperating with the wing to which it is connected, for said folding and unfolding operations, and which mechanism allows a limited angular free floating motion of the wing above and below the horizontal "unfolded" or "working" position when the hydraulic control valve is set accordingly. The connection of the hydraulic piston rod with the wing is so organized that the straight line motion of the piston rod is enabled to fold and unfold the wing through an arc well in excess of 180 DEG and is organized to allow a limited free floating action of the wing for following the soil surface variations.
|
