| 摘要 |
<p>A hinge assembly is disclosed, especially for use with an agricultural implement, wherein a part of the implement is mounted for pivotal movement about a first pivot between a working outer position and a retracted inner position for transportation and storage, and is automatically locked in its working position. A member of the hinge assembly is connected intermediate its ends by a second pivot to a hydraulic piston and cylinder assembly and is connected to the implement at one end by a third pivot. The other end of the member is connected to one end of a coupling link by a fourth pivot, the opposite end of the coupling link being connected by a fifth pivot to the movable part of the implement. The arrangement is such that when the movable part is in its working outer position, the third pivot and the fourth pivot are positioned in line with the fifth pivot.</p> |
