Patent ID: 8313361
Filing Date: 2012-11-20
Classification: A01F,Y10T

Abstract:
1. A helical bar concave comprising: a frame having two side walls and two end walls connected together to define a top opening, the two side walls comprising a top edge having a radius; a grate connected to top edges of the side walls and end walls over the top opening of the frame, the grate having an inside radius conforming to the radius of the top edges of the side walls; a functional surface on the interior surface of the grate for contacting a crop; elongate cutouts extending substantially the length of the inside radius in the grate defining a percent open area, the cutouts arranged in a helical geometry to form a substantially circumferential helical functional surface; helical mounting framework in the grate separating the cutouts; wherein when the helical bar concave is mounted in a threshing and separation system, the helical geometry of the helical cutouts and helical mounting framework is generally in the same direction, and parallel to a flow path of a spiraling crop flow; and rub bars mounted to a surface of the grate and connected to the mounting framework, wherein the rub bars are mounted to the grate in a helical fashion meaning that the rub bars are mounted such that a length of each of the rub bars is substantially perpendicular to the helical cutouts and helical mounting framework.