Patent ID: 8479670

Claim:
An agricultural implement comprising: a tool bar adapted to be coupled to a prime mover; and a plurality of ground opener units mounted to the tool bar, each of the ground opener units including: 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, 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 a cylinder 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 each of the ground opener units.