Patent ID: 7240626

Claim:
A method for reducing seed trench depth variations during operation of a seed planting unit including 1) a planting unit frame that carries i) a seed trench opening assembly including a seed trench forming member operable to create a seed trench in a ground surface, ii) a seed delivery assembly delivering seeds into the seed trench, and iii) a seed trench closing assembly operable to close the seed trench, and 2) a planting unit support assembly including i) first and second opposing gauge wheels in mechanical communication with the frame, and ii) at least one rear press wheel in mechanical communication with the gauge wheels, the steps comprising: A) causing a vertical displacement of one of the first gauge wheel and the at least one rear press wheel in a first direction relative to the frame; C) biasing the other of the first gauge wheel and the at least one rear press wheel in a direction opposite the first direction relative to the frame in response to step (A), wherein the gauge wheels are connected to the frame via gauge wheel arms having upper ends that engage opposite ends of a bracket that is pivotally connected to the frame, wherein step (A) further comprises pivoting the bracket to displace the other gauge wheel in the opposite direction, further comprising the step of connecting the at least one rear press wheel to at least one of the gauge wheels via a tandem arm, wherein one of the gauge wheel arms defines a lower end that is connected to the tandem arm, further comprising the step of connecting a press wheel assembly to the bracket via a bell crank that 1) is pivotally connected to the frame at one location, 2) in mechanical communication with a press wheel assembly at a second location, and 3) in mechanical communication with the bracket at a third location.