| 摘要 |
<p>The machine comprises a frame (1), which is designed to be drawn behind a tractor. The frame carries three pivot axes (A,B,C), which are parallel to one another, horizontal and perpendicular to the direction of travel. The pivot axes carry respectively, the towing arm (5) of the frame, at least, one primary stone rake (2) and a link arm (3) carrying the rolling rear axle. The three elements are carried by the three axes and are arranged to pivot independently. The position of each element is also controlled independently by the three jacking elements (18-20). The stone rake is carried centrally and its position is controlled by the horizontal acting jack (20), which is mounted in one of a series of holes (26), provided in the frame.</p> |
