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The normally horizontal frame of a wheeled farm implement, such as used for tillage purposes, has a center section at the ends of which are hinged a pair of wing sections that are fully foldable into overlying, substantially parallel relationship to the center section through use of hydraulic cylind

The normally horizontal frame of a wheeled farm implement, such as used for tillage purposes, has a center section at the ends of which are hinged a pair of wing sections that are fully foldable into overlying, substantially parallel relationship to the center section through use of hydraulic cylinder assemblies. At each hinge a pair of links, pivotally connected to corresponding hinge straps, have a common pivotal connection at their upper ends with the piston rod of the cylinder. A pintle-receiving slot, strategically located in the wing section hinge strap not only permits limited rise and fall of the wing section over uneven terrain but causes smooth swinging movements of the wing sections to and from their folded conditions. Entirely eliminated is free falling of the wing sections because of constant control by the hydraulic assemblies made possible by abutment at all times of the spring-loaded pintles against one end of the slots. Such construction completely avoids jolting and jarring of the frame parts and other implement components during folding and unfolding operations, thereby preventing damage to the implement and injury to the operator.

대표청구항 ▼

In a folding implement frame: a pair of hingedly interconnected frame sections, one of which is swingable from a generally horizontal operating position in essentially the same horizontal plane as the other section to a folded position disposed in overlying relationship to said other section; power

In a folding implement frame: a pair of hingedly interconnected frame sections, one of which is swingable from a generally horizontal operating position in essentially the same horizontal plane as the other section to a folded position disposed in overlying relationship to said other section; power means connected to said other section; and coupling means operably connecting the power means with said one section for effecting said swinging movement thereof, said coupling means including an elongated slot and a transverse pin received therein, said slot being so oriented relative to the line of force between the power means and the one section when the latter is in said operating position as to permit the one section to rise and fall freely and independently of the power means to the extent permitted by engagement of the pin against opposite ends of the slot, said orientation of the slot further being such that said line of force is at least substantially perpendicular to the longitudinal axis of the slot when the one section is in a raised position approximately midway between said operating and folded positions whereby to prevent free-fall of the one section incurred by the pin moving freely in the slot, said coupling means further including an elongated, rigid, push-pull link pivotally connected at one end to said power means and at the opposite end to said one section through said pin and slot, said line of force being transmitted through said rigid link.