Concave segment for harvest separation

1. A concave segment for a combine harvester, provided for separating harvest, extending in a curve about a concave axis in a circumferential direction, the concave segment comprising:

a curved frame extending in a curve about the concave axis; and

a plurality of finger strips, wherein the plurality of finger strips each have a transverse strip, wherein the transverse strips are transverse to the finger strips and are attached to the curved frame, each transverse strip extending in a direction of extension parallel to the concave axis, and wherein a plurality of fingers are disposed on each of the transverse strips,

wherein at least some of the fingers have a first side and a second side and have a curved cross section,

wherein the first side is opposite the second side,

wherein the first side has an outer curvature and faces the concave axis and the second side has an inner curvature; and

Wherein a cross-section of a free end of the at least some of the fingers is curved in a direction parallel to the transverse strips.

2. The concave segment according to claim 1 , wherein the transverse strips each have an upper surface,

wherein the upper surface has a wave shape in the direction of extension,

wherein the upper surface faces the concave axis,

wherein a peak of the wave shape of the upper surface is disposed flush with the outer curvature of the fingers, and

wherein the peak of the wave shape is rounded and counter to the direction of extension.

3. The concave segment according to claim 2 , wherein a trough of the wave shape of the upper surface are disposed flush with gaps of a same finger strip; and

wherein the trough of the wave shape is rounded and counter to the direction of extension.

4. The concave segment according to claim 2 , wherein a wave shape of transverse strips has troughs and peaks,

wherein the fingers of the finger strips are disposed flush with the troughs of adjacent finger strips, and

wherein the peaks are disposed flush with the fingers of same finger strips.

5. The concave segment according to claim 1 , wherein free ends of the fingers of the finger strips are each spaced apart from transverse strips of adjacent finger strips in the circumferential direction such that a gap is between the fingers and the transverse strips of the adjacent finger strips;

wherein the transverse strips each comprise a first leg and a second leg, which are disposed at an angle greater than 0° to one another;

wherein the finger strips are attached to the frame using a respective first leg; and

wherein the second leg defines an upper surface of the transverse strip, and the fingers extend from the second leg to a free end.

6. The concave segment according to claim 1 , wherein the finger strips are reversibly pivotable about respective pivot axes that extend parallel to the transverse strips.

7. A concave device for a combine harvester comprising:

a plurality of concave segments extending in a curve about a concave axis in a circumferential direction, each of the plurality of concave segments comprising:

a plurality of finger strips, wherein the finger strips each have a transverse strip, wherein the transverse strips each extend in a direction of extension parallel to the concave axis, and wherein a plurality of fingers are disposed on each of the transverse strips, wherein at least some of the fingers have a first side and a second side and have a curved cross section of a free end in a direction parallel to the transverse strips, wherein the first side is opposite the second side, and wherein the first side has an outer curvature and faces the concave axis and the second side has an inner curvature,

wherein the concave device is a threshing concave device for a tangential threshing unit for tangential combine harvesters and/or hybrid combine harvesters.

8. The concave device according to claim 7 , wherein the plurality of concave segments comprise an axial separating device for hybrid combine harvesters.

9. The concave device according to claim 7 , wherein the plurality of concave segments are disposed adjacent to one another in a circumferential direction and/or behind one another in an axial direction.

10. A combine harvester having at least one concave segment according to claim 1 .

11. A concave segment for a combine harvester, the concave segment extending in a curve about a concave axis in a circumferential direction, the concave segment comprising:

a plurality of finger strips extending in an axial direction, wherein the finger strips each comprise:

a transverse strip having an upper surface with an undulating wave shape extending in the axial direction, the undulating wave shape on the upper surface defining peaks and troughs along the upper surface; and

a plurality of fingers coupled to and extending from the transverse strip, wherein at least some of the fingers have a curved cross section of a free end in a direction parallel to the transverse strip with an upper convex surface facing the concave axis and a lower concave surface facing away from the concave axis.

12. The concave segment according to claim 11 , wherein the upper convex surface of the fingers are aligned with the peaks of the upper surface of the transverse strip.

13. The concave segment according to claim 12 , wherein the plurality of fingers are spaced apart in the axial direction and define gaps therebetween.

14. The concave segment according to claim 1 , wherein the first side comprises an outer convex surface; and

wherein the second side comprises an inner concave surface.

15. The concave segment according to claim 14 , wherein the first side comprises a same wave shape as the second side.

16. The concave segment according to claim 1 , wherein the transverse strips have an upper surface and a lower surface;

wherein the upper surface has a wave shape; and

wherein the lower surface has a wave shape.

17. The concave segment according to claim 16 , wherein the wave shape for the upper surface is the same as the wave shape for the lower surface.

18. The concave segment according to claim 1 , wherein the fingers of adjacent finger strips are positioned such that the fingers are offset to one another in the axial direction; and

wherein the offset of the fingers of the adjacent finger strips result in the fingers being positioned in the respective finger strip such that the fingers are flush with a gap of the respective adjacent finger strips in and counter to the circumferential direction.

19. The concave segment according to claim 1 , wherein the transverse strips each comprise a first leg and a second leg, which are disposed at an angle 90° to one another;

wherein respective fingers extend from the second leg to a free end of the respective finger; and

wherein the transverse strips are connected to the frame at the first leg.