Patent Number: 6,305,478

Title: Hydraulic controls for agricultural implements

Abstract: An agricultural implement, having ground engaging tools mounted on subframes that are movable through hydraulic actuators between raised transport and lowered working positions, is provided with a hydraulic circuit in which the actuators are connected in parallel with one another within a grouping of the actuators. The positioning of the ground engaging tools into a lowered working position closes the hydraulic circuit for the group of actuators. The subframes are arranged to float over ground undulations to maintain a common working depth for the ground engaging tools. The vertical movement of any one of the actuators in the common group will force a displacement of a corresponding amount of hydraulic fluid, which will then be shared by all of the remaining actuators in the corresponding group. A depth averaging control for the ground engaging tools and a mechanical headland stop apparatus are also provided for the agricultural implement.

Inventors: Friggstad; Terrance A. (Grasswood, CA)

Assignee: Flexi-Coil Ltd.

International Classification: A01B 73/00 (20060101); A01B 63/00 (20060101); A01B 63/32 (20060101); A01B 063/00 ()

Expiration Date: 10/23/2018