Cultural implement with foldable tool supporting frame

摘要

An agricultural implement has a hinged winged frame which swings between a horizontal storage position over the main frame and an outboard generally horizontal work position. A hydraulic cylinder pivoted to the implement main frame has its piston pivotally connected to the upper end of an operating link which pivotally connects at its opposite end to a link made rigid with the wing frame and which swings on the hinge axis. An abutment block on one of the links engages the other link to solidify the pivotal connection of the links converting the two links into a first class lever fulcrumed on the hinge axis as the piston is retracted within the cylinder to raise the wing frame out of its working position. The abutment block is carried out of engagement with the other link as the pivotal connection of the links approaches the axis of the cylinder pull thereon; and a guideway catches and confines the pivotal connection to the operating link as the links move apart to interrupt the solidified connection, said guideway supporting the load of the wing frame as the piston further retracts to lower the wing frame to its horizontal storage position over the main frame.