| 摘要 |
A reversible plough has a main link (7) extending between the reversing spindle (6) and the plough beam (10). A first adjustable link (12) extends between the reversing spindle (6) and the main link (7) and a second adjustable link (13) extends between the main link (7) and the plough beam (10). Means such as a double-threaded screw member, a crank or hydraulically linked cylinders are provided for adjusting the effective lengths of the two links (12, 13) in tandem so as to shift the plough beam (10) laterally to adjust the front furrow width without affecting the pulling position. In a modification for use on variable furrow width ploughs, the first adjustable link (12) is connected not to the reversding spindle (6) but to a lever (43) which is rotatable coaxially with the main link (7). Rotation of the lever (43) then provides for adjustment of the general furrow width as an alternative to the above described adjustment of the front furrow width only. In either case, independent adjustment of the effective length of one of the adjustable links (12, 13) provides control over the pulling position.
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