Patent ID: 7387077

Claim:
A seed planter comprising: a wheel mounted frame for movement over soil to be planted; at least one lateral rock shaft connected to the frame; a frame member parallel to the rock shaft and spaced from it; a plurality of seed planter assemblies connected to the rock shaft; each seed planter assembly including: a torsion joint assembly connected to the rock shaft; a planting equipment yoke; planting equipment connected to the planting equipment yoke; a parallelogram linkage connecting the torsion joint assembly and the planting equipment yoke; said parallelogram linkage having an upper strut and a lower strut parallel to the upper strut, said upper and lower struts having movable ends pivotally connected to a connecting bar, said connecting bar rigidly connected to the planting equipment yoke; one of said struts having a fixed end connected to the torsion joint assembly; the other of said struts having a fixed end pivotally connected to the frame member whereby a parallelogram is formed between the upper and lower struts and the connecting bar and an imaginary line connecting the fixed ends of the upper and lower struts.