US Patent 7347311 Folding mechanism for road machinery foldable conveyors

A mechanism is for a foldable vehicle conveyor having an axis, inner and outer sections and a joint connecting the sections, the outer section being pivotable between a deployed position and a folded position at which the outer section is disposed above the inner section. A linkage displaces the outer section between the two positions and includes a drive link pivotable on the inner section and a connector link pivotably connected with the drive link and with the outer section. The linkage moves between a deployed limit position where the drive link centerline extends parallel to the conveyor axis and the connector link centerline extends perpendicularly to the conveyor axis, and a folded limit position where the drive link centerline is generally perpendicular to the conveyor axis and the connector link centerline is generally parallel to and above the conveyor axis. An actuator displaces the linkage between the two positions.