Abstract: A hydraulic circuit includes a control valve, a first hydraulic actuator, and a second hydraulic. The hydraulic circuit is configured such that in a first step, the first hydraulic actuator opens a product barrier in response to movement of the control valve into a first position, in a second step, the second hydraulic actuator moves a product engagement member in a first direction and the first hydraulic actuator closes the product barrier in response to movement of the control valve into a second position, in a third step, the first hydraulic actuator opens the product barrier in response to movement of the control valve into the first position, and in a fourth step, the second hydraulic actuator moves the product engagement member in a second direction and the first hydraulic actuator closes the product barrier in response to movement of the control valve into the second position.

Abstract: A folding marker for connection to an agricultural implement toolbar with a marker shoulder pivot, an inner arm and a double acting hydraulic cylinder both pivotally connected to the shoulder pivot. A middle arm bracket is pivotally connected to the inner arm and the cylinder. A middle arm is connected to the middle arm bracket, with two beams extending from the bracket and terminating at an outer arm pivot, with a third beam connected between the bracket and a crossbrace. An outer arm pivot bracket is pivotally connected to the outer arm pivot, an outer arm connected thereto and having two legs connected between the outer arm pivot bracket and a plate assembly. The legs define a channel therebetween, and an adjustable arm is slidably connected within the channel. An extension element is insertable within the channel and lockable with the plate assembly, with a marking element connected thereto.

Abstract: 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 actuate movements of the marker cylinders and an electrical control system including a plurality of manually operable actuating switches to effect operation of said hydraulic valves. Each of the switches provides an output in response to a single actuation thereof and there is provided an output timer operable to effect operation of the hydraulic valves for a period of time sufficient to effect a stroke of the cylinders. The electrical control system provides an output in response to actuation of selected ones of the switches only in response to actuation of the switch for a predetermined time period sufficient to avoid inadvertent actuation.

Abstract: A wide farm implement is provided with a swingable tongue which permits endwise to and from fields. A pair of transport wheels are provided for supporting the implement for endwise transport and the support wheels, on which the implement is supported during a field working operation, are raised so as not to interfere with endwise transport. In order to prevent the automatic lowering of a row marker when the support wheels are thus raised relative to the frame, a blocking valve is provided in the row marker hydraulic circuit which moves to its closed position when the tongue is moved from its field working position thereby preventing lowering of the row marker.

Abstract: A sequencing valve utilized with a tractor-propelled planter having two row arms which pivot downward to the ground in an alternating sequence as the planter changes directions in the field. The sequencing valve is connected with the conventional hydraulic system which raises and lowers the planter at the end of each row so as to automatically lower alternate marker arms. This is achieved by pressurizing opposite ends of the sequencing valve spool for longitudinal movement through a cam means, causing the spool to rotate during movement in one direction whereby alternating lowering of the planter arms is achieved each time the planter is hydraulically lowered to the ground.

Abstract: The planter height and control system is adapted for use with an agricultural planter assembly which is adapted to be mechanically and hydraulically coupled to a tractor and which includes a frame, a plurality of equally spaced planter units mounted to the frame, and at least two wheel assemblies on each side of the planter assembly. Each wheel assembly is pivotally mounted to the frame and includes a piston and cylinder mechanism which, when the piston rod thereof is extended, pivots the wheel assembly downwardly to effect raising of the planter units.

Abstract: The automatic alternating marker system is adapted for use with an agricultural planter assembly which has a plurality of planter units, which is adapted to be mechanically and hydraulically coupled to a tractor, and which has hydraulically actuated, first and second extendable markers, each mounted on one side of the planter assembly. Each marker is used to mark, respectively, the track that a tractor wheel should follow on a return planting sweep of the planter assembly for planting properly spaced adjacent rows after the planter assembly has made a first sweep to plant a plurality of rows. The system includes an electrical control circuit for causing extension of the first marker and retraction of the second marker upon the raising of the planters and the turning of the tractor 180.degree., and for causing extension of the second marker and retraction of the first marker upon the next raising of the planters and the next turning of the tractor 180.degree..

Abstract: An automatically oscillating device is provided for permitting opposing alternate movement by two associated movable members from a common center point.

Abstract: An implement such as a tractor-propelled, multi-row planter having row markers hingedly mounted on opposite sides is provided with an automatically operating hydraulic sequencing valve for alternately actuating the markers. The sequencing valve is adapted to be readily connected with the hydraulic system of the tractor used to raise and lower the implement. If desired the hydraulic circuit may be arranged so that the sequencing valve is automatically actuated or sequenced when the implement is raised and lowered whereby the oppositely mounted markers are alternately raised and lowered automatically with the raising and lowering of the implement itself.

Abstract: Row marker assemblies are pivotally mounted near the ends of a tool bar adapted to carry various types of implements. A pair of marker control arms near the center of the tool bar are connected with the two marker assemblies for controlling the raising and lowering of the latter. A single hydraulic cylinder interconnects the control arms and regulates their movements in cooperation with gravity-responsive pivoted latch bars on the control arms. The latch bars are alternately engaged with a stationary keeper attached to the tool bar and are alternately separated therefrom by a camming and lifting action of each latch bar in response to retraction of the single cylinder, the lifting of each latch bar serving to release the opposing latch bar from the keeper, and the first latch bar then moving by gravity into positive locking engagement with the keeper. Rotational elements, springs and other external controls on the two cooperating latch bars are eliminated.

Abstract: A device for alternately restraining movement of each end of a powered extensible and retractable link having first and second sections. The device is contained within a housing which can be inserted into a toolbar and attached to row marker assemblies to alternately lift and lower each row marker. Included as part of the device is a housing having channels therein for guiding linear movement of the link sections, a detent lever for alternately restraining movement of each link section and an actuating mechanism which causes the detent lever to alternately engage and release each link section.