Patent ID: 7111566

Claim:
A seed planting assembly comprising: a laterally extending tool bar; a planting unit including a planting unit frame supported by the tool bar, wherein the planting unit frame carries: i. a seed trench opening assembly operable to create a seed trench; ii. a seed delivery assembly delivering seeds into the seed trench; and iii. a seed trench closing assembly operable to close the seed trench; a mounting assembly including an upper and lower support beam members pivotally linking the planting unit frame with the tool bar, wherein the mounting assembly permits the planting unit to raise and lower with respect to the tool bar; a vertical positioner including a first linkage connected to the lower beam member, and a second linkage connected to the first linkage at a positioner joint and further in mechanical communication with the planting unit frame; and a biasing member urging the second linkage towards the positioner joint wherein the second linkage defines a slot operable to receive an actuating lever.