Agricultural machine with pivoted frame

摘要

An agricultural machine, such as a seed sowing machine, has a fixed central frame (18) which supports two pivoted frames (16). These pivoted frames can pivot in the horizontal plane about the bolts (17) or they can pivot in the vertical plane about the bolts (23). - Each frame has a short arm (50) with an end plate with a cylindrical surface and the axis of this cylinder coincides with the axis of the bolt. When the frames are swung about the bolts the cylindrical plates come into contact with each other and prevent the frames being swung in the vertical plane.