Patent ID: 7581503

Claim:
An agricultural machine, comprising: a tool bar; and at least one opener/closer arrangement carried by said tool bar for opening a trench in soil, each said opener/closer arrangement including: an opener disc positioned at an angle relative to a working direction and defining a trench profile, said opener disc having an axis of rotation, a leading edge, and a trailing edge positioned adjacent one side of said trench profile; a gauge wheel positioned generally inline with said opener disc adjacent said trailing edge of said opener disc, said gauge wheel having a leading edge positioned between said leading edge and said trailing edge of said opener disc; a first closing wheel positioned on a side of said trench profile opposite said gauge wheel, said first closing wheel having a leading edge positioned between said axis of rotation and said trailing edge of said opener disc; and a second closing wheel positioned on a same side of said trench profile as said gauge wheel, said first closing wheel having a trailing edge, said second closing wheel leading edge being positioned generally inline with said trailing edge of said first closing wheel, relative to the working direction.