Abstract: A cushion hydraulic cylinder is provided with a series of longitudinally separated metering orifices in the wall of the cylinder through which exhausted fluid is expelled. As the piston extends towards these metering orifices a seal sequentially cover and uncovers the metering orifices further restricting the flow of exhausted fluid. In addition the piston is provided with radial bores having one or more longitudinal passages which are in fluid communication with either the piston side of the cylinder or the rod side of the cylinder. The first longitudinal passage is provided with a passage orifice through which exhausted fluid can flow after a circumferential piston seal reopens a previously blocked metering orifice. The second longitudinal passage maybe provided with a check valve which prevents the flow of fluid in one direction.

Abstract: A folding boom for a tri-fold row marker for an agricultural implement. The boom comprises three segments, an inboard segment pivotally coupled to the toolbar, a middle segment pivotally coupled to the inboard segment, and an outboard segment pivotally coupled to the middle segment. Control of the boom during folding and unfolding is maintained by a toggle link mechanism having a cam a cam follower and a system of pivots and linkages. Dynamic forces are dampened at both ends of the folding and unfolding by use of a cushion hydraulic cylinder with flow limiting structure at each end of the cylinder stroke.