| 摘要 |
<p>The mechanism keeps the steering wheels of a farm implement, attached to the three-point mounting of a tractor, in track with the latter. If the implement veers to the left or the right of the path followed by the tractor, the distance between them varies, causing movement of a lever acting on the steering wheels. This distance variation can be amplified to a varying degree by altering the lever length.</p> |
