Patent ID: 8141652

Claim:
A towable agricultural implement comprising: a tow bar assembly coupled to a transverse central tool bar; two wing tool bars, pivotally coupled to the central tool bar, configured to fold forward and lock to a planter hitch assembly which is coupled to the tow bar assembly; a plurality of wing actuators, coupled to the tow bar assembly and to each of the two wing bars, wherein the wing actuators are controllable to extend and fold the wing tool bars; a plurality of row units attached to the central tool bar and the wing tool bars; a plurality of wing wheel assemblies coupled to the wing tool bars, wherein the wing wheel assemblies are configured to retract forward of the wing tool bars when the implement is in a ground engaging position and to extend toward the row units and below the wing tool bars in a first extended position; a central wheel assembly coupled to the tow bar assembly, wherein the central wheel assembly comprises a scissor-type joint, and the central wheel assembly is configured to retract to a position forward of the central tool bar when the implement is in a ground engaging position and to extend downward and forward in a scissor-type motion when in a second extended position; and a seed tank assembly supported by the tow bar assembly and configured to shift rearwardly relative to the tow bar assembly to offset a load on the planter hitch assembly associated with the forward folding of the two wing tool bars; wherein the scissor-type joint comprises: a first member having a first end; an axle disposed through the first end; the wheel rotatably coupled to the axle; and a second member having a first end pivotally coupled to a second end of the first member, and a second end pivotally coupled to the tow bar assembly.