Control system for field markers of an agricultural machine

A - Human Necessities – 01 – B

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A01B 69/02 (2006.01) F15B 11/16 (2006.01) F15B 21/08 (2006.01)

Patent

CA 2201245

A control apparatus for use with two opposed ground markers of an agricultural machine comprises a hydraulic circuit including a plurality of hydraulic valves for communicating fluid to first and second cylinders to actuate said movements of the first and second markers and an electrical control system including a plurality of manually operable actuating switches, the electrical control system being arranged to effect operation of said hydraulic valves in response to operation of said manually operable switches. Each of the switches is of the type providing an output in response to a singled actuation thereof and there is provided an output timer operable to effect operation of said hydraulic valves for a period of time sufficient to effect a stroke of the first and second hydraulic cylinders. The electrical control system is arranged such that an output in provided in response to actuation of selected ones of said manually operable switches only in response to actuation of the switch for a predetermined time period sufficient to avoid inadvertent actuation. The switches include a first switch for actuating extension of the first marker and a second switch for actuating extension of the second marker and a single third switch for effecting retraction movement of both the first and second markers. Four indicator lights are provided for indicating the position of the markers and a control unit for effecting flashing of a respective one of the indicator lights when the respective marker is moving toward a respective one of the positions.

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