Patent ID: 6675907
Filing Date: 2004-01-13
Classification: A01B

Abstract:
An agricultural implement comprising:a main frame having support wheels and adapted to be drawn by a traction vehicle; a toolbar having a center section and at least a first wing section and a second wing section, each wing section mounted to an associated end of said center section for independent movement about a generally horizontal axis; a linkage mounting said toolbar to said main frame; a first hydraulic unit coupled between said main frame and said linkage for raising and lowering said center section; second and third hydraulic units coupled between said center section and said first and second wings respectively for raising and lowering said wing sections; a single work valve and a single transport valve adapted to be operated from an operator's position on a traction vehicle; and an hydraulic control circuit for controlling said first, second and third hydraulic units, wherein said hydraulic control circuit is responsive to said transport valve being placed in an unfold position when said first and second wing sections are in a transport position to lower said first and second wing sections to an intermediate position; said hydraulic circuit being further responsive to said work valve being placed in a work position when said wing sections are in said intermediate position to actuate said first second and third hydraulic units to lower said first and second wing sections from said intermediate position and said center section from a raised position to place the toolbar in a field use position; said hydraulic circuit being thereafter responsive to said work valve being placed in an end row turn position to actuate said first, second and third hydraulic units to raise said wing sections above said center section, and to raise said center section above said field use position to permit turning at the end of a row with said toolbar in an elevated position above said field use position and said wings inclined upwardly from their respective connections to said center section; and said hydraulic circuit being further responsive to said transport valve being placed in a fold position when said toolbar is in said field use position or said elevated position to actuate said first, second and third hydraulic units to fold said first and second wing sections and raise said center section to a folded position for transport.