Patent ID: 6454019
Filing Date: 2002-09-24
Classification: A01B,A01C,Y10S

Abstract:
An agricultural implement comprising:a frame; a furrow opening device having at least one surface, wherein the surface moves between a first cutting position in which the surface is configured to cut into soil to create a furrow and a second non-cutting position; at least one elastomeric torsion element coupled to the at least one surface, wherein the at least one torsion element resiliently biases the surface towards the first cutting position; a support coupled to the furrow opening device; a four bar linkage having a first end pivotably coupled to the frame and a second end pivotably coupled to the support, the four bar linkage including first and second parallel upper links and first and second parallel lower links; a first torsion arm pivotably coupled between one of the upper links and the lower links; a second torsion arm coupled to the other of the upper links and the lower links; a tube fixedly coupled to one of the first torsion arm and the second torsion arm; and a shaft coupled to the other of the first torsion arm and the second torsion arm, the shaft extending through the tube, wherein the elastomeric torsion element is disposed in the tube between the tube and the shaft and wherein the elastomeric element is resiliently deformed such that the element applies a torque to the first and second torsion arms in attempting to resiliently return to its original shape.