Patent ID: 7743844
Filing Date: 2010-06-29
Classification: A01B

Abstract:
1. A disc harrow comprising: a mainframe; a subframe pivotably coupled to the mainframe; a disc gang assembly coupled to the subframe; a lever pivotably supported by said mainframe; a bracket and hinge arrangement pivotable with respect to said mainframe, the bracket and hinge arrangement having a first end operatively connected to the lever and a second end coupled to the subframe; a link spaced along the mainframe from the bracket and hinge arrangement, and having a first end coupled to the mainframe and a second end, wherein the link follows movements of the lever; a spring mechanism having a first end pivotably coupled to the second end of the link and a second end coupled to the subframe; a pivoting mechanism pivotably coupling the first end of the spring mechanism to the second end of the link, the pivoting mechanism configured to allow the spring mechanism and the disc gang assembly to pivot relative to the mainframe when an obstruction is encountered during harrowing of a farmland; an actuator with a first end operatively connected to the lever -and a second end adapted to be mounted to a hitch, said actuator not directly coupled to said spring mechanism and operative to pivot the lever with respect to the mainframe to raise and lower the subframe to a desired depth; and