| 摘要 |
A marine plough (10) is described having twin, complementary steering mechanisms (13, 14): one or more steerable soil-engaging fins (21) and a tow rope (5) attachment mechanism (14) that enables adjustment of the position of a tow rope retention point relative to the plough. This alters the position at which the line of a tow rope (5) crosses the longitudinal axis of the plough, so that the plough can operate at offset tow positions. The tow rope attachment mechanism (14) comprises a bridle (9) having two bridle limbs terminating at respective bridle limb retention points. The adjustment of the position of the tow rope retention point relative to the plough is done by moving the bridle rope retention points or adjusting the relative length of the bridle limbs. The bridle limb retention points can be moved, using cylinders (29), from towing positions to lifting positions at which the tow bridle can be used to lift the plough in a substantially level attitude. The soil-engaging fins (21) are carried by supporting skids (2), in turn carried by a steering member (22; 23; 24) pivotable relative to the plough about a substantially vertical axis. Ploughing depth can be adjusted (42) by altering the vertical distance between the skids and the steering member. |
