Toolbar wing lift control

An agricultural implement configured to be towed by an agricultural vehicle, comprising:

• a first frame having a first plurality of spaced-apart ground engaging tools;
• a second frame having a second plurality of spaced-apart ground engaging tools and pivotally coupled to the first frame;
• a hydraulic cylinder coupled between the first frame and the second frame to pivot the first frame with respect to the second frame about a substantially horizontal axis;
• a hydraulic control circuit fluidly coupled to the hydraulic cylinder and including a pressure regulating valve configured to provide a supply of hydraulic fluid under substantially constant pressure to a first port of the hydraulic cylinder over a range of pivotal positions of the first frame with respect to the second frame;
• and
• a hydraulic pump configured to be driven by the agricultural vehicle and fluidly coupled to the pressure regulating valve to supply fluid to the first port of the hydraulic cylinder at a substantially constant pressure, wherein the hydraulic cylinder has a first piston and a first piston rod coupled to the first piston and extending out of the hydraulic cylinder, wherein the first piston and first piston rod are moveable to a fully extended position, a fully retracted position and an intermediate position between the fully extended and fully retracted positions, wherein the fully extended position defines a first frame raised position in which the first frame is pivoted above the second frame, wherein the fully retracted position defines a first frame lowered position in which the first frame is pivoted below the second frame, and wherein the intermediate position defines an intermediate frame position in which the first frame is pivoted above the second frame between the first raised and second lowered positions.

An agricultural implement, comprising:

• a central frame having a first plurality of spaced-apart ground engaging tools mounted thereon;
• a wing having a second plurality of spaced-apart ground engaging tools mounted thereon and pivotally coupled to the central frame;
• a hydraulic cylinder coupled between the central frame and the wing to pivot the wing with respect to the central frame about a substantially horizontal axis;
• and
• a hydraulic control circuit fluidly coupled to the hydraulic cylinder and being configured to be coupled to first and second pumps, the hydraulic control circuit 1) including a pressure regulating valve configured to provide a supply of hydraulic fluid under substantially constant pressure to a first port of the hydraulic cylinder from the first pump over a range of pivotal positions of the wing with respect to the central frame in order to apply a down pressure on the wing relative to the central frame, and 2) being configured to selectively couple a second port of the hydraulic cylinder to the second pump to lift the wing relative to the ground.

An agricultural implement, comprising:

• a central frame having a first plurality of spaced-apart ground engaging tools mounted thereon;
• a wing having a second plurality of spaced-apart ground engaging tools mounted thereon and pivotally coupled to the central frame;
• a hydraulic cylinder coupled between the central frame and the wing to pivot the wing with respect to the central frame about a substantially horizontal axis;
• a hydraulic control circuit fluidly coupled to the hydraulic cylinder and including a pressure regulating valve configured to provide a supply of hydraulic fluid under substantially constant pressure to a first port of the hydraulic cylinder over a range of pivotal positions of the wing with respect to the central frame;
• and
• a hydraulic pump configured to be driven by the agricultural vehicle and fluidly coupled to the pressure regulating valve to supply fluid to the first port of the hydraulic cylinder at a substantially constant pressure, wherein
• the hydraulic cylinder has a first piston and a first piston rod coupled to the first piston and extending out of the hydraulic cylinder, wherein
• the first piston and first piston rod are moveable to a fully extended position, a fully retracted position and an intermediate position between the fully extended and fully retracted positions, wherein
• the fully extended position defines a wing raised position in which the wing is pivoted above the central frame, and wherein
• the fully retracted position defines a wing lowered position in which the wing is pivoted below the central frame, and the intermediate position defines an intermediate frame position in which the wing is pivoted above the central frame between the first and second lowered positions.

An agricultural implement configured to be towed by an agricultural implement comprising:

• a ground engaging support;
• a main frame having a first plurality of spaced-apart ground engaging tools mounted thereon;
• a wing having a second plurality of spaced apart ground engaging tools mounted thereon;
• a first pump;
• a first hydraulic cylinder coupled between the main frame and the wing to pivot the wing with respect to the main frame about a substantially horizontal axis, the first hydraulic cylinder having 1) a first port which is selectively coupleable to the first pump to force the wing to pivot downwardly relative to the main frame to apply down pressure to the wing, and 2) a second port which is selectively coupleable to a second pump to pivot the wing upwardly relative to the main frame;
• and
• a second hydraulic cylinder coupled between the main frame and the ground engaging support, the second hydraulic cylinder having a port which is selectively coupleable to the second pump to raise the main frame relative to the ground engaging support.