Abstract: Locking structure for securing a four-bar linkage or the like on an implement in a raised position to remove an earthworking tool or row unit from ground engagement. An overcenter spring arrangement selectively biases a strap pivotally connected to one arm of the linkage toward or away from a member located on the opposite arm. When the strap is biased toward the member, raising the tool or row unit causes the strap to engage the member to prevent rocking of the linkage and thereby secure the device out of ground contact. Reversing the spring arrangement and raising the device causes the strap to move out of locking engagement with the member for normal operation. An elongated device includes pins for aiding the operator in both moving the over-center spring arrangement between positions and raising the tool or row unit.

Abstract: A forwardly folding agricultural machine, such as a row crop implement (e.g., planter), including three basic sections, one of which is a rear, central section and the other two of which are respectively right and left wing sections. In operating mode, the wing sections lie at opposite sides of a central hitch and are transversely alined on a line offset forwardly of the rear section. In transport mode, the wing sections fold forwardly, one at each side of the drawbar. The wheels for the sections are arranged so that they do not intervene among the tools, thus enabling easier lateral adjustment of the tools as to row spacing, especially when it is desired to obtain extra narrow spacing.

Abstract: An agricultural implement of the type capable of folding from a wide operating mode to a narrow transport mode. The folding involves forward folding of the right and left wing sections alongside the central, fore-and-aft hitch. Featured are support wheels respectively for the wing sections which are selectively movable from the extended, forward positions in the operating mode to retracted or rearward positions in the transport mode to enable the wing sections to be more closely folded relative to the hitch and thus to achieve a narrower transport width. The closely spaced end-to-end relationship of the wing sections in operating mode provide for relatively narrow row spacing because only the hitch intervenes between the proximate ends of the sections.