HARROW DOWNFORCE ADJUSTMENT

摘要

A harrow attachment for a tillage implement includes a harrow drawbar mounting at least one rank of harrowing tools. A pivot link pivotally couples the harrow rank to the drawbar so it can trip by pivoting upward toward the drawbar from a home position in which the harrow rank is farthest away from the drawbar. A downforce spring is coupled to the drawbar and in a variable length state when the harrow rank is tripped to apply a return biasing force to the harrow rank. An adjustment mechanism couples the spring to the harrow rank and/or the pivot link in one of a plurality of adjustment locations in each of which the harrow rank is in the home position and the spring is in a fixed length state in which the biasing force is removed.

主权项

1. A harrow attachment for a tillage implement, comprising:
a harrow drawbar configured to mount to a frame member of the tillage implement; at least one harrow rank having a rank bar supporting a plurality of harrowing tools; a pivot link pivotally coupling the at least one harrow rank to the drawbar to allow the at least one harrow rank to trip by pivoting upward toward the drawbar from a home position in which the at least one harrow rank is farthest away from the drawbar; a downforce spring coupled to the drawbar and configured to be in a fixed length state when the at least one harrow rank is in the home position and in a variable length state when the at least one harrow rank is tripped, when in the variable length state the downforce spring applies a biasing force to the at least one harrow rank away from the drawbar, and when in the fixed length state the biasing force is removed; and an adjustment mechanism coupling the downforce spring to one of the at least one harrow rank and the pivot link in one of a plurality of adjustment locations in each of which the at least one harrow rank is in the home position and the downforce spring is in the fixed length state.