| 摘要 |
A mechanism including a linear hydraulic motor for displacing the wing of an agricultural field implement through 180 degrees about a horizontal axis so that it lies inverted on the body of this implement. A special feature of the mechanism is that the arrangement of the line of action of the hydraulic motor is never such, when in compression, as to lift a guiding roller for a wing actuating link off the upper surface of a cooperative short horizontal flat track. From the time the roller first engages the track to the time the roller has been displaced to the far side of the track, the force acting on the roller is directed downwardly. The roller is mounted on a pivoted arm and during this time, the pivot axis of the arm moves steadily upwardly.
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