| 摘要 |
The invention concerns a lifting device comprising, in its lower part, two arms (7) articulated on a shaft (8) linked to the tractor for attaching two low lateral points (10) of the implement, and in its upper part at least one element linking (11) a third point between the tractor and the implement, the arms (7) being controlled by the lifting means (M) and the linking element (11) having a variable useful length. A means (S) responsive to the angular position of the arms includes a first transducer (T1) associated with one arm (7) to deliver an electric signal depending on the angular position of said arm, and at least a second transducer (T2) responsive to the length of the third point linking element (11) to deliver an electric signal depending on said length. An electric circuit, with the transducers (T1, T2) connected in parallel between a line terminal and the ground connection, is designed to mix the signals from the transducers and deliver the signal which serves to control the lifting means (M).
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