Patent ID: 7753134

Claim:
A coulter assembly, comprising: a support structure; a coulter disk rotatably coupled to the support structure and configured to engage soil; a scraper including a blade and an arm, wherein the blade is disposed adjacent to a soil engaging portion of the coulter disk, and the arm is rotatably coupled to the support structure and extends along a substantially straight path to the blade; a fertilizer tube coupled to said scraper; wherein said fertilizer tube delivers fertilizer into soil; and a torsion spring disposed about a rotational axis of the arm and configured to rotationally bias the blade toward the coulter disk by applying a torque between the support structure and the arm; said torsion spring disposed about a scraper sleeve; a second end of the torsion spring disposed against the arm at substantially a right angle on a side of the arm opposite from the coulter disk; said scraper sleeve disposed between two mounts and an opening in said sleeve aligns with an opening in each mount; a first end of said spring placed within an opening of a bracket; a pin inserted through the two mounts and the sleeve; wherein said pin provides a rotational axis for the scraper; wherein the blade is rotationally biased toward the coulter disk by applying torque between the support structure and the arm.