Patent ID: 9220200
Filing Date: 2015-12-29
Classification: A01F

Abstract:
1. A combine harvester having a crop processing rotor, comprising: a concave assembly having at least one concave extending at least partially beneath the rotor in a circumferential manner and pivotable about pivot point to move the concave in a generally concentric manner toward and away from rotor so as to adjust the operating clearance between concave assembly and rotor; an operating mechanism configured to pivot the concave assembly to adjust the operating clearance between the concave assembly and the rotor, the operating mechanism comprising an actuator and a linkage assembly connecting the actuator to the concave assembly, wherein the actuator is selectively positionable to adjust the position of the concave relative the rotor, and wherein the linkage assembly comprises a hydraulic cylinder that applies a substantially constant force to the concave assembly to control pressure put on the crop; a hydraulic supply porting hydraulic fluid to the hydraulic cylinder; and an accumulator located in series between the hydraulic supply and the hydraulic cylinder.