Patent ID: 8286566

Claim:
A ground opener unit for an agricultural implement, comprising: an accessory bracket having a disc opener mounted thereto; a rockshaft configured to be pivotably coupled to a tool bar, the rockshaft having first and second opposite sides; a spring trunnion arm projecting from the first side of the rockshaft; a rockshaft pivot arm projecting from the second side of the rockshaft; an actuator mount arm projecting from the second side of the rockshaft; a parallel linkage coupling the accessory bracket to the tool bar of the implement, the parallel linkage having an upper link pivotably connected to the tool bar and a lower link pivotably connected to the rockshaft pivot arm; a down pressure device having a first end coupled to the spring trunnion arm and a second end coupled to the accessory bracket; and an actuator having a first end pivotably connected to a support arm of the agricultural implement and a second end pivotably connected to the actuator mount arm, wherein actuation of the actuator is operative to rotate the rockshaft to raise and lower the ground opener unit.